SIPROTEC 4 7UT6 Differential Protection Relay for Transformers, Generators, Motors and Busbars
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8 Transformer Differential Protection / 7UT6
SIPROTEC 4 7UT6 Differential Protection Relay
for Transformers, Generators, Motors and Busbars
Function overview
• Differential protection for 2- up to
5-winding transformers (3-/1-phase)
• Differential protection for motors and
generators
• Differential protection for short 2 up to
5 terminal lines
• Differential protection for busbars up
to 12 feeders (phase-segregated or with
summation CT)
Protection functions
LSP2456-afpen.tif
7UT633/635
• Differential protection with phase-seg-
regated measurement
7UT613 • Sensitive measuring for low-fault cur-
rents
• Fast tripping for high-fault currents
Fig. 8/1 SIPROTEC 4 7UT612
• Restraint against inrush of transformer
7UT6 differential protection relay for transformers,
generators, motors and busbars • Phase /earth overcurrent protection
• Overload protection with or without
temperature measurement
Description • Negative-sequence protection
The SIPROTEC 7UT6 differential protec- 7UT613 and 7UT63x only feature full cov- • Breaker failure protection
tion relays are used for fast and selective erage of applications without external re- • Low/high-impedance restricted earth
fault clearing of short-circuits in trans- lays by the option of multiple protection fault (REF) 8
formers of all voltage levels and also in ro- functions e.g. overcurrent protection is • Voltage protection functions (7UT613/633)
tating electric machines like motors and available for each winding or measurement
generators, for short lines and busbars. location of a transformer. Other functions Control functions
The protection relay can be parameterized
are available twice: earth-fault differential • Commands for control of circuit-
protection, breaker failure protection and breakers and isolators
for use with three-phase and single-phase
overload protection. Furthermore, up to
transformers. • 7UT63x: Graphic display shows posi-
12 user-defined (flexible) protection func-
tions may be activated by the customer
tion of switching elements, local/remote
The specific application can be chosen by
parameterization. In this way an optimal with the choice of measured voltages, cur- switching by key-operated switch
adaptation of the relay to the protected ob- rents, power and frequency as input vari- • Control via keyboard, binary inputs,
ject can be achieved. ables. DIGSI 4 or SCADA system
In addition to the differential function, a The relays provide easy-to-use local con- • User-defined logic with CFC
backup overcurrent protection for 1 wind- trol and automation functions. Monitoring functions
ing/star point is integrated in the relay. The integrated programmable logic (CFC)
• Self-supervision of the relay
Optionally, a low or high-impedance re- allows the users to implement their own
stricted earth-fault protection, a negative- functions, e.g. for the automation of • Trip circuit supervision
sequence protection and a breaker failure switchgear (interlocking). User-defined • Oscillographic fault recording
protection can be used. 7UT613 and messages can be generated as well. • Permanent differential and restraint
7UT633 feature 4 voltage inputs. With this The flexible communication interfaces are current measurement, extensive scope
option an overvoltage and undervoltage open for modem communication architec- of operational values
protection is available as well as frequency tures with control system.
protection, reverse / forward power pro- Communication interfaces
tection, fuse failure monitor and overexci- • PC front port for setting with DIGSI 4
tation protection. With external tempera- • System interface
ture monitoring boxes (thermo-boxes)
IEC 61850 Ethernet
temperatures can be measured and moni-
IEC 60870-5-103 protocol,
tored in the relay. Therefore, complete
thermal monitoring of a transformer is
PROFIBUS-FMS/-DP,
possible, e.g. hot-spot calculation of the oil MODBUS or DNP 3.0
temperature. • Service interface for DIGSI 4 (modem)/
temperature monitoring (thermo-box)
• Time synchronization via IRIG-B/DCF 77
Siemens SIP · 2006 8/3
8 Transformer Differential Protection / 7UT6
Application
The numerical protection relays 7UT6 are
primarily applied as differential protection
on
– transformers
7UT612: 2 windings
7UT613/633: 2 up to 3 windings
7UT635: 2 up to 5 windings,
– generators
– motors
– short line sections
– small busbars
– parallel and series reactors.
The user selects the type of object that is to
be protected by setting during configura-
tion of the relay. Subsequently, only those
parameters that are relevant for this partic-
ular protected object need to be set. This
concept, whereby only those parameters
relevant to a particular protected object
need to be set, substantially contributed to
a simplification of the setting procedure.
Only a few parameters must be set. There-
fore the new 7UT6 relays also make use of
and extend this concept. Apart from the
protected plant objects defined in the
7UT6, a further differential protection
function allows the protection of
8 – single busbars with up to 12 feeders.
The well-proven differential measuring al-
gorithm of the 7UT51 relay is also used in
the new relays, so that a similar response
with regard to short-circuit detection, trip-
ping time saturation detection and inrush
restraint is achieved.
Fig. 8/2 Function diagram
8/4 Siemens SIP · 2006
8 Transformer Differential Protection / 7UT6
Application
7UT613/33
Protection functions ANSI No. Three-phase Single-phase Auto- Generator/ Busbar, Busbar,
7UT612
7UT635
transformer transformer transformer Motor 3-phase 1-phase
Differential protection 87T/G/M/L 1 1 1 X X X X X X
Earth-fault differential protection 87 N 1 2 2 X X X*) X – –
Overcurrent-time protection, phases 50/51 1 3 3 X X X X X –
Overcurrent-time protection 3I0 50/51N 1 3 3 X – X X X –
Overcurrent-time protection, earth 50/51G 1 3 3 X X X X X X
Overcurrent-time protection, 1 1 1 X X X X X X
single-phase
Negative-sequence protection 46 1 1 1 X – X X X –
Overload protection IEC 60255-8 49 1 2 2 X X X X X –
Overload protection IEC 60354 49 1 2 2 X X X X X –
Overexcitation protection *) V/Hz 24 – 1 – X X X X X X
Overvoltage protection *) V> 59 – 1 – X X X X – –
Undervoltage protection *) V< 27 – 1 – X X X X – –
Frequency protection *) f>, f< 81 – 1 – X X X X – –
Reverse power protection *) -P 32R – 1 – X X X X – –
Forward power protection*) P>, P< 32F – 1 – X X X X – –
Fuse failure protection 60FL – 1 – X X X X – –
Breaker failure protection 50 BF 1 2 2 X X X X X –
External temperature monitoring 38 X X X X X X X X X
(thermo-box)
Lockout 86 X X X X X X X X X 8
Measured-value supervision X X X X X X X X X
Trip circuit supervision 74 TC X X X X X X X X X
Direct coupling 1 X X X X X X X X X
Direct coupling 2 X X X X X X X X X
Operational measured values X X X X X X X X X
Flexible protection functions 27, 32, 47, – 12 12 X X X X X X
50, 55, 59, 81
X Function applicable
– Function not applicable in this application
*) Only 7UT613/63x
Construction
The 7UT6 is available in three housing
widths referred to a 19” module frame sys-
tem. The height is 243 mm.
– 1/3 (7UT612),
– 1/2 (7UT613),
– 1/1 (7UT633/635) of 19”
All cables can be connected with or with-
out cable ring lugs. Plug-in terminals are
available as an option, it is thus possible to
employ prefabricated cable harnesses. In
LSP2236F.tif
the case of surface mounting on a panel,
the connection terminals are located above
and below in the form of screw-type termi- Fig. 8/3
nals. The communication interfaces are lo- Rear view with screw-type terminals
cated on the same sides of the housing. For
dimensions please refer to the dimension
drawings (part 16).
Siemens SIP · 2006 8/5
8 Transformer Differential Protection / 7UT6
Protection functions
Differential protection for transformers
(ANSI 87T)
When the 7UT6 is employed as fast and se-
lective short-circuit protection for trans-
formers the following properties apply:
• Tripping characteristic according to
Fig. 8/4 with normal sensitive IDIFF> and
high-set trip stage IDIFF>>
• Vector group and ratio adaptation
• Depending on the treatment of the trans-
former neutral point, zero-sequence cur-
rent conditioning can be set with or
without consideration of the neutral cur-
rent. With the 7UT6, the star-point cur-
rent at the star-point CT can be measured
and considered in the vector group treat-
ment, which increases sensitivity by one
third for single-phase faults.
• Fast clearance of heavy internal trans-
Fig. 8/4
former faults with high-set differential Tripping characteristic with preset transformer parameters for three-phase faults
element IDIFF>>.
• Restrain of inrush current with 2nd har-
monic. Cross-block function that can be
limited in time or switched off.
• Restrain against overfluxing with a choice
of 3rd or 5th harmonic stabilization is only
8 active up to a settable value for the funda-
mental component of the differential
current.
• Additional restrain for an external fault
with current transformer saturation
(patented CT-saturation detector from
7UT51).
• Insensitivity to DC current and current Fig. 8/5
3-winding transformers (1 or 3-phase)
transformer errors due to the freely pro-
grammable tripping characteristic and
fundamental filtering.
• The differential protection function can
be blocked externally by means of a binary
input.
8/6 Siemens SIP · 2006
8 Transformer Differential Protection / 7UT6
Protection functions Differential protection for single-phase
busbars (see Fig. 8/7)
Sensitive protection by measurement of (ANSI 87L)
star-point current (see Fig. 8/6)
The short-circuit protection is character-
(ANSI 87N/87GD)
ized by the large number of current mea-
Apart from the current inputs for detec- suring inputs. The scope of busbar
tion of the phase currents on the sides of protection ranges from a few bays e.g. in
the protected object, the 7UT6 also con- conjunction with one and a half cir-
tains normal sensitivity IE and high sensi- cuit-breaker applications, to large stations
tivity IEE current measuring inputs. having up to more than 50 feeders. In par-
Measurement of the star-point current of ticular in smaller stations, the busbar pro-
an earthed winding via the normal sensi- tection arrangements are too expensive.
tivity measuring input, and consideration With the 7UT6 relays the current inputs
of this current by the differential protec- may also be used to achieve a cost-effective
tion, increases the sensitivity during inter- busbar protection system for up to 12 feed-
nal single-phase faults by 33 %. If the sum ers (Fig. 8/7). This busbar protection func-
of the phase currents of a winding is com- tions as a phase-selective protection with
pared with the star-point current measured 1 or 5 A current transformers, whereby the
protected phase is connected. All three Fig. 8/6
with the normal sensitivity input IE, a sen- High-impedance differential protection
sitive earth current differential protection phases can therefore be protected by apply-
can be implemented (REF). ing three relays. Furthermore a sin-
gle-phase protection can be implemented
This function is substantially more sensi- by connecting the three-phase currents via
tive than the differential protection during a summation transformer. The summation
faults to earth in a winding, detecting fault transformer connection has a rated current
currents as small as 10 % of the trans- of 100 mA.
former rated current.
The selectivity of the protection can be im-
Furthermore, this relay contains a proved by monitoring the current magni-
high-impedance differential protection in- tude in all feeders, and only releasing the
put. The sum of the phase currents is com- differential protection trip command when 8
pared with the star-point current. A the overcurrent condition is also met. The
voltage-dependent resistor (varistor) is ap- security measures to prevent maloperation
plied in shunt (see Fig. 8/6). Via the sensi- resulting from failures in the current trans-
tive current measuring input IEE, the former secondary circuits can be improved
voltage across the varistor is measured; in in this manner. This overcurrent release
the milli-amp range via the external resis- may also be used to implement a breaker
tor. The varistor and the resistor are failure protection. Should the release signal
mounted externally. An earth fault results not reset within a settable time, this indi-
in a voltage across the varistor that is larger cates that a breaker failure condition is Fig. 8/7
than the voltage resulting from normal present, as the short-circuit was not Simple busbar protection with phase-selective
current transformer errors. A prerequisite switched off by the bay circuit-breaker. Af- configuration
is the application of accurate current trans- 7UT612: 7 feeders
ter expiry of the time delay the circuit-
formers of the class 5P (TPY) which ex- 7UT613/633: 9 feeders
breakers of the infeeds to the busbar may 7UT635: 12 feeders
hibit a small measuring error in the be tripped.
operational and overcurrent range. These
current transformers may not be the same Differential protection for generators and
as used for the differential protection, as motors (see Fig. 8/8)
the varistor may cause rapid saturation of (ANSI 87G/M)
this current transformers.
Equal conditions apply for generators, mo-
Both high-impedance and low-impedance tors and series reactors. The protected zone
REF are each available twice (option) for is limited by the sets of current transfomers
transformers with two earthed windings. at each side of the protected object.
Thus separate REF relays are not required.
Fig. 8/8
Generator/motor differential protection
Siemens SIP · 2006 8/7
8 Transformer Differential Protection / 7UT6
Protection functions Overexcitation protection Volt/Hertz Undervoltage protection (ANSI 27)
(ANSI 24) (7UT613/633 only) (7UT613/633 only)
n Backup protection functions The overexcitation protection serves for The undervoltage protection evaluates the
Overcurrent-time protection detection of an unpermissible high induc- positive-sequence components of the volt-
(ANSI 50, 50N, 51, 51N) tion (proportional to V/f) in generators or ages and compares them with the thresh-
transformers, which leads to a thermal old values. There are two stages available.
Backup protection on the transformer is
overloading. This may occur when starting
achieved with a two-stage overcurrent pro- The undervoltage function is used for
up, shutting down under full load, with
tection for the phase currents and 3I0 for asynchronous motors and pumped-storage
weak systems or under isolated operation.
the calculated neutral current. This func- stations and prevents the voltage-related
The inverse characteristic can be set via
tion may be configured for one of the sides instability of such machines.
seven points derived from the manufac-
or measurement locations of the protected
turer data. The function can also be used for monitor-
object. The high-set stage is implemented
In addition, a definite-time alarm stage ing purposes.
as a definite-time stage, whereas the nor-
and an instantaneous stage can be used.
mal stage may have a definite-time or in-
Overvoltage protection (ANSI 59)
verse-time characteristic. Optionally, IEC
Trip circuit supervision (ANSI 74TC) (7UT613/633 only)
or ANSI characteristics may be selected for
the inverse stage. The overcurrent protec- One or two binary inputs can be used for This protection prevents insulation faults
tion 3I0 uses the calculated zero-sequence monitoring the circuit-breaker trip coil in- that result when the voltage is too high.
current of the configured side or measure- cluding its incoming cables. An alarm sig-
ment location. nal occurs whenever the circuit is Either the maximum line-to-line voltages
Multiple availability: 3 times (option) interrupted. or the phase-to-earth voltages (for
low-voltage generators) can be evaluated.
Overcurrent-time protection for earth Lockout (ANSI 86) The measuring results of the line-to-line
(ANSI 50/51G) voltages are independent of the neutral
All binary outputs (alarm or trip relays) point displacement caused by earth faults.
The 7UT6 feature a separate 2-stage can be stored like LEDs and reset using the This function is implemented in two
overcurrent-time protection for the earth. LED reset key. The lockout state is also stages.
As an option, an inverse-time characteris- stored in the event of supply voltage fail-
tic according to IEC or ANSI is available. ure. Reclosure can only occur after the Frequency protection (ANSI 81)
In this way, it is possible to protect e.g. a lockout state is reset. (7UT613/633 only)
8 resistor in the transformer star point
against thermal overload, in the event of a External trip coupling The frequency protection prevents imper-
single-phase short-circuit not being cleared missible stress of the equipment (e.g. tur-
For recording and processing of external bine) in case of under or overfrequency. It
within the time permitted by the thermal
trip information via binary inputs. They also serves as a monitoring and control ele-
rating.
are provided for information from the ment.
Multiple availability: 3 times (option)
Buchholz relay or specific commands and
act like a protective function. Each input The function has four stages; the stages can
Phase-balance current protection (ANSI 46) be implemented either as underfrequency
initiates a fault event and can be individu-
(Negative-sequence protection) or overfrequency protection. Each stage
ally delayed by a timer.
Furthermore a negative-sequence protec- can be delayed separately.
tion may be defined for one of the sides or Even in the event of voltage distortion, the
measurement locations. This provides sen- frequency measuring algorithm reliably
sitive overcurrent protection in the event identifies the fundamental waves and de-
of asymmetrical faults in the transformer. termines the frequency extremely precisely.
The set pickup threshold may be smaller Frequency measurement can be blocked by
than the rated current. using an undervoltage stage.
Breaker failure protection (ANSI 50BF)
If a faulted portion of the electrical circuit
is not disconnected upon issuing of a trip
command, another command can be initi-
ated using the breaker failure protection
which operates the circuit-breaker, e.g.,
of an upstream (higher-level) protection
relay.
Multiple availability: 2 times (option)
8/8 Siemens SIP · 2006
8 Transformer Differential Protection / 7UT6
Protection functions
The reverse-power protection monitors the
direction of active power flow and picks up
when the mechanical energy fails. This
function can be used for operational shut-
down (sequential tripping) of the genera-
tor but also prevents damage to the steam
turbines. The reverse power is calculated
from the positive-sequence systems of cur-
rent and voltage. Asymmetrical power sys-
tem faults therefore do not cause reduced
LSP2376-afp.tif
measuring accuracy. The position of the
emergency trip valve is injected as binary
information and is used to switch between
two trip command delays. When applied
for motor protection, the sign (±) of the
active power can be reversed via param-
eters. Fig. 8/9
Temperature measurement and monitoring with external thermo-boxes
Forward-power protection (ANSI 32F)
(7UT613/633 only)
Monitoring of the active power produced Thermal monitoring of transformers The oil temperature must be registered via
by a generator can be useful for starting up the thermo-box for the implementation of
and shutting down generators. One stage The importance of reducing the costs of
this function. An alarm warning stage and
monitors exceeding of a limit value, while transmitting and distributing energy by
final alarm stage is issued when the maxi-
another stage monitors falling below an- optimizing the system load has resulted in
mum hot-spot temperature of the three
the increased importance of monitoring
other limit value. The power is calculated
the thermal condition of transformers.
legs exceeds the threshold value. 8
using the positive-sequence component of
current and voltage. The function can be This monitoring is one of the tasks of the For each transformer leg a relative rate of
used to shut down idling motors. monitoring systems, designed for medium ageing, based on the ageing at 98 °C is indi-
and large transformers. Overload protec- cated as a measured value. This value can
Flexible protection functions tion based on a simple thermal model, and be used to determine the thermal condi-
(7UT613/63x only) using only the measured current for evalu- tion and the current thermal reserve of
ation, has been integrated in differential each transformer leg. Based on this rate of
For customer-specific solutions up to 12 protection systems for a number of years. ageing, a remaining thermal reserve is indi-
flexible protection functions are available cated in % for the hottest spot before the
and can be parameterized. Voltages, cur- The ability of the 7UT6 to monitor the
alarm warning and final alarm stage is
rents, power and frequency from all mea- thermal condition can be improved by se-
reached.
surement locations can be chosen as rial connection of a temperature monitor-
inputs. Each protection function has a ing box (also called thermo-box or RTD-
settable threshold, delay time, blocking in- box) (Fig. 8/9). The temperature of up to
put and can be configured as a 1-phase or 12 measuring points (connection of
3-phase unit. 2 boxes) can be registered. The type of sen-
sor (Pt100, Ni100, Ni120) can be selected
Monitoring functions individually for each measuring point.
Two alarm stages are derived for each mea-
The relay comprises high-performance suring point when the corresponding set
monitoring for the hardware and software. threshold is exceeded.
The measuring circuits, analog-digital con- Alternatively to the conventional overload
version, power supply voltages, battery, protection, the relay can also provide a hot-
memories and software sequence spot calculation according to IEC 60345.
(watch-dog) are all monitored. The hot-spot calculation is carried out sep-
The fuse failure function detects failure of arately for each leg of the transformer and
the measuring voltage due to short-circuit takes the different cooling modes of the
or open circuit of the wiring or VT and transformer into consideration.
avoids overfunction of the undervoltage el-
ements in the protection functions.
(7UT613/633 only)
Siemens SIP · 2006 8/9
8 Transformer Differential Protection / 7UT6
Protection functions
Measured values
The operational measured values and sta-
tistic value registering in the 7UT6, apart
from the registration of phase currents
and voltages (7UT613/633 only) as pri-
mary and secondary values, comprises the
following:
• Currents 3-phase IL1, IL2, IL3, I1, I2, 3I0 for
each side and measurement location
• Currents 1-phase I1 to I12
for each feeder and further inputs Ix1 to Ix4
• Voltages 3-phase VL1, VL2, VL3, VL1L2, VL2L3,
VL3L1, V1, V2, V0 and 1-phase VEN, V4
• Phase angles of all 3-phase/ 1-phase cur-
rents and voltages
• Power Watts, Vars, VA/P, Q, S (P, Q: total
LSP2821.tif
and phase selective)
• Power factor (cos ϕ),
• Frequency Fig. 8/10
• Energy + kWh, + kVarh, forward and Commissioning via a standard Web browser: Phasor diagram
reverse power flow
• Min./max. and mean values of VPH-PH,
VPHE, VE, V0, V1, V2, IPH, I1, I2, 3I0, IDIFF,
IRESTRAINT, S, P, Q, cos ϕ, f
• Operating hours counter
8
• Registration of the interrupted currents
and counter for protection trip com-
mands
• Mean operating temperature of overload
function
• Measured temperatures of external
thermo-boxes
• Differential and restraint currents of dif-
ferential protection and REF
Metered values
For internal metering, the unit can calcu-
late an energy metered value from the
LSP2822.tif
measured current and voltage values.
The 7UT6 relays may be integrated into
monitoring systems by means of the di- Fig. 8/11
verse communication options available in Commissioning via a standard Web browser: Operating characteristic
the relays. An example for this is the con-
nection to the SITRAM transformer moni- ing functions of the bay controller. The an- be indicated as primary or secondary val-
toring system with PROFIBUS-DP alog measured values are represented as ues. The differential protection bases its
interface. wide-ranging operational measured values. pickup thresholds on the rated currents of
To prevent transmission of information to the transformer. The referred differential
Commissioning and operating aids the control center during maintenance, the and stabilising (restraint) currents are
bay controller communications can be dis- available as measured values per phase.
Commissioning could hardly be easier and abled to prevent unnecessary data from be- If a thermo-box is connected, registered
is fully supported by DIGSI 4. The status of ing transmitted. During commissioning, all temperature values may also be displayed.
the binary inputs can be read individually indications with test marking for test pur- To check the connection of the relay to the
and the state of the binary outputs can be poses can be connected to a control and primary current and voltage transfor-
set individually. The operation of switch- protection system. mers, a commissioning measurement is
ing elements (circuit-breakers, disconnect All measured currents and voltages provided.
devices) can be checked using the switch- (7UT613/633 only) of the transformer can
8/10 Siemens SIP · 20068 Transformer Differential Protection / 7UT6
Protection functions Command processing Chatter disable
All the functionality of command process- The chatter disable feature evaluates
This measurement function works with
ing is offered. This includes the processing whether, in a configured period of time,
only 5 to 10 % of the transformer rated
of single and double commands with or the number of status changes of indication
current and indicates the current and the
without feedback, sophisticated monitor- input exceeds a specified figure. If ex-
angle between the currents and voltages (if
ing of the control hardware and software, ceeded, the indication input is blocked for
voltages applied). Termination errors be-
checking of the external process, control a certain period, so that the event list will
tween the primary current transfomers and
actions using functions such as runtime not record excessive operations.
input transformers of the relay are easily
monitoring and automatic command ter-
detected in this manner. Filter time
mination after output. Here are some typi-
The operating state of the protection may cal applications:
All binary indications can be subjected to a
therefore be checked online at any time.
• Single and double commands using 1, 1 filter time (indication suppression).
The fault records of the relay contain the
plus 1 common or 2 trip contacts
phase and earth currents as well as the cal- Indication filtering and delay
culated differential and restraint currents. • User-definable bay interlocks
The fault records of the 7UT613/633 relays • Operating sequences combining several Indications can be filtered or delayed.
also contain voltages. switching operations such as control of Filtering serves to suppress brief changes in
circuit-breakers, disconnectors and potential at the indication input. The indi-
Browser-based commissioning aid earthing switches cation is passed on only if the indication
The 7UT6 provides a commissioning and • Triggering of switching operations, in- voltage is still present after a set period of
test program which runs under a standard dications or alarm by combination with time. In the event of indication delay, there
internet browser and is therefore inde- existing information is a wait for a preset time. The information
pendent of the configuration software pro- is passed on only if the indication voltage is
vided by the manufacturer. Automation / user-defined logic still present after this time.
For example, the correct vector group of With integrated logic, the user can set, via a Indication derivation
the transformer may be checked. These graphic interface (CFC), specific functions
values may be displayed graphically as vec- for the automation of switchgear or substa- A further indication (or a command) can
tor diagrams. tion. Functions are activated via function be derived from an existing indication.
keys, binary input or via communication Group indications can also be formed. The
The stability check in the operating charac-
interface. volume of information to the system inter- 8
teristic is available as well as event log and face can thus be reduced and restricted to
trip log messages. Remote control can be the most important signals.
Switching authority
used if the local front panel cannot be ac-
cessed. Switching authority is determined accord- Transmission lockout
ing to parameters, communication or by
n Control and automation functions key-operated switch (when available). A data transmission lockout can be acti-
vated, so as to prevent transfer of informa-
Control If a source is set to “LOCAL”, only local tion to the control center during work on
switching operations are possible. The fol- a circuit bay.
In addition to the protection functions, the lowing sequence of switching authority is
SIPROTEC 4 units also support all control laid down: “LOCAL”; DIGSI PC program, Test operation
and monitoring functions that are required “REMOTE”
for operating medium-voltage or high- During commissioning, all indications can
voltage substations. Every switching operation and change of be passed to an automatic control system
breaker position is kept in the status indi- for test purposes.
The main application is reliable control of cation memory. The switch command
switching and other processes. source, switching device, cause (i.e. spon-
The status of primary equipment or auxil- taneous change or command) and result of
iary devices can be obtained from auxiliary a switching operation are retained.
contacts and communicated via binary in-
puts. Therefore it is possible to detect and Assignment of feedback to command
indicate both the OPEN and CLOSED po- The positions of the circuit- breaker or
sition or a fault or intermediate circuit- switching devices and transformer taps are
breaker or auxiliary contact position. acquired by feedback. These indication in-
The switchgear or circuit-breaker can be puts are logically assigned to the corre-
controlled via: sponding command outputs. The unit can
therefore distinguish whether the indica-
– integrated operator panel tion change is a consequence of switching
– binary inputs operation or whether it is a spontaneous
– substation control and protection system change of state (intermediate position).
– DIGSI 4
Siemens SIP · 2006 8/118 Transformer Differential Protection / 7UT6
Communication Commissioning aid via a standard Web
browser
With respect to communication, particular
In the case of the 7UT6, a PC with a stand-
emphasis has been placed on high levels of
ard browser can be connected to the local
flexibility, data integrity and utilization of
PC interface or to the service interface (re-
standards common in energy automation.
fer to “Commissioning program”). The re-
The design of the communication modules
lays include a small Web server and send
permits interchangeability on the one
their HTML-pages to the browser via an
hand, and on the other hand provides
established dial-up network connection.
openness for future standards (for exam-
ple, Industrial Ethernet). Retrofitting: Modules for every type of
communication
Local PC interface
Communication modules for retrofitting
The PC interface accessible from the front
are available for the entire SIPROTEC 4
of the unit permits quick access to all pa-
unit range. These ensure that, where differ-
rameters and fault event data. Of particular
ent communication interfaces (electrical or Fig. 8/12
advantage is the use of the DIGSI 4 operat-
optical) and protocols (IEC 61850 Ethernet, IEC 60870-5-103 star-type RS232 copper
ing program during commissioning.
IEC 60870-5-103, PROFIBUS-FMS/-DP, conductor connection or fiber-optic connection
MODBUS RTU, DNP 3.0, DIGSI, etc.) are
Rear-mounted interfaces
required, such demands can be met. Master control units
Two communication modules located on
the rear of the unit incorporate optional Safe bus architecture
equipment complements and readily per-
• RS485 bus
mit retrofitting. They assure the ability to
With this data transmission via copper
comply with the requirements of different
conductors electromagnetic fault influ-
communication interfaces.
ences are largely eliminated by the use of
The interfaces make provision for the fol- twisted-pair conductor. Upon failure of a
lowing applications: unit, the remaining system continues to
operate without any disturbances.
8 • Service interface (Port C/Port D1))
In the RS485 version, several protection • Fiber-optic double ring circuit
units can be centrally operated with The fiber-optic double ring circuit is im-
DIGSI 4. On connection of a modem, re- mune to electromagnetic interference.
mote control is possible. Via this interface Upon failure of a section between two
communication with thermo-boxes is units, the communication system contin-
executed. ues to operate without disturbance.
• System interface (Port B) It is generally impossible to communicate
This interface is used to carry out com- with a unit that has failed. If a unit were to
munication with a control or protection fail, there is no effect on the communica- Fig. 8/13
and control system and supports a variety tion with the rest of the system. Bus structure: Fiber-optic double ring circuit
of communication protocols and interface
designs, depending on the module con-
nected.
Fig. 8/14
Bus structure for station bus with Ethernet
1) Only for 7UT613/633/635 und IEC 61850, fiber-optic ring
8/12 Siemens SIP · 20068 Transformer Differential Protection / 7UT6
Communication
LSP2163-afpen.tif
IEC 61850 Ethernet
As of mid-2004, the Ethernet-based
IEC 61850 protocol is the worldwide stan-
dard for protection and control systems
used by power supply corporations.
Siemens is the first manufacturer to sup-
port this standard. By means of this proto-
col, information can also be exchanged
directly between bay units so as to set up Fig. 8/15
simple masterless systems for bay and sys- R232/RS485 electrical communication module
tem interlocking. Access to the units via
the Ethernet bus is also possible with
DIGSI.
LSP2162-afpen.tif
IEC 60870-5-103
IEC 60870-5-103 is an internationally stan-
dardized protocol for the efficient commu-
nication in the protected area.
IEC 60870-5-103 is supported by a number
of protection device manufacturers and is
used worldwide.
Fig. 8/16
PROFIBUS-FMS Fiber-optic communication module
PROFIBUS-FMS is an internationally stan-
dardized communication system (EN
50170). PROFIBUS is supported inter-
nationally by several hundred manufactur-
ers and has to date been used in more than 8
1,000,000 applications all over the world.
LSP2164-afpen.tif
Connection to a SIMATIC S5/S7 program-
mable controller is made on the basis of
the data obtained (e.g. fault recording, Fig. 8/17
fault data, measured values and control Communication module, optical double-ring
functionality) via SICAM energy automa-
tion system or via PROFIBUS-DP.
PROFIBUS-DP
PROFIBUS-DP is an industry-recognized
standard for communications and is sup-
ported by a number of PLC and protection
device manufacturers.
LSP2810.tif
MODBUS RTU Fig. 8/18
MODBUS RTU is an industry-recognized Optical Ethernet communication module
for IEC 61850 with integrated Ethernet switch
standard for communications and is sup-
ported by a number of PLC and protection
device manufacturers.
DNP 3.0
DNP 3.0 (Distributed Network Protocol
Version 3) is a messaging-based communi-
cation protocol. The SIPROTEC 4 units
are fully Level 1 and Level 2 compliant
with DNP 3.0.
DNP 3.0 is supported by a number of pro-
tection device manufacturers.
Siemens SIP · 2006 8/138 Transformer Differential Protection / 7UT6
Communication
System solutions for protection and station
control
Together with the SICAM power automa-
tion system, SIPROTEC 4 can be used with
PROFIBUS-FMS. Over the low-cost elec-
trical RS485 bus, or interference-free via
the optical double ring, the units exchange
information with the control system.
Units featuring IEC 60870-5-103 interfaces
can be connected to SICAM in parallel via
the RS485 bus or radially by fiber-optic
link. Through this interface, the system is
open for the connection of units of other
manufacturers (see Fig. 8/12).
Because of the standardized interfaces,
SIPROTEC units can also be integrated
into systems of other manufacturers or in
SIMATIC. Electrical RS485 or optical in-
terfaces are available. The optimum physi-
cal data transfer medium can be chosen
thanks to opto-electrical converters. Thus,
the RS485 bus allows low-cost wiring in
the cubicles and an interference-free opti- Fig. 8/19
cal connection to the master can be estab- System solution: Communications
lished.
For IEC 61850, an interoperable system so-
8 lution is offered with SICAM PAS. Via the
100 Mbits/s Ethernet bus, the units are
linked with PAS electrically or optically to
the station PC. The interface is standard-
ized, thus also enabling direct connection
of units of other manufacturers to the
Ethernet bus. With IEC 61850, however,
the units can also be used in other manu-
facturers’ systems (see Fig. 8/14).
8/14 Siemens SIP · 20068 Transformer Differential Protection / 7UT6
Typical connections
Fig. 8/20
Standard connection to a transformer
without neutral current measurement
8
Fig. 8/21
Connection to a transformer
with neutral current measurement
Siemens SIP · 2006 8/158 Transformer Differential Protection / 7UT6
Typical connections
Fig. 8/22
Connection of transformer differential protection
with high impedance REF (I7) and neutral current
measurement at I8
8
8/16 Siemens SIP · 20068 Transformer Differential Protection / 7UT6
Typical connections
Fig. 8/23
Connection example to a single-phase power
transformer with current transformer between
starpoint and earthing point
8
Fig. 8/24
Connection example to a single-phase power
transformer with only one current transformer (right
side)
Siemens SIP · 2006 8/178 Transformer Differential Protection / 7UT6
Typical connections
Fig. 8/25
Connection to a three-phase auto-transformer
with current transformer between starpoint
and earthing point
8
Fig. 8/26
Generator or motor protection
8/18 Siemens SIP · 20068 Transformer Differential Protection / 7UT6
Typical connections
Fig. 8/27
Connection 7UT612 as single-phase busbar protection for 7 feeders, illustrated for phase L1
8
Fig. 8/28
Connection 7UT612 as busbar protection for feeders, connected via external summation current transformers (SCT) –
partial illustration for feeders 1, 2 and 7
Siemens SIP · 2006 8/198 Transformer Differential Protection / 7UT6
Typical connections
8
Fig. 8/29
Connection example 7UT613 for a
three-winding power transformer
8/20 Siemens SIP · 20068 Transformer Differential Protection / 7UT6
Typical connections
8
Fig. 8/30
Connection example 7UT613 for a three-winding power transformer
with current transformers between starpoint and earthing point, additional connection
for high-impedance protection; IX3 connected as high-sensitivity input
Siemens SIP · 2006 8/218 Transformer Differential Protection / 7UT6
Typical connections
8
Fig. 8/31
Connection example 7UT613 for a three-phase auto-transformer
with three-winding and current transformer between starpoint and earthing point
8/22 Siemens SIP · 20068 Transformer Differential Protection / 7UT6
Typical connections
8
Fig. 8/32
Connection example 7UT635 for a three-winding power transformer
with 5 measurement locations (3-phase) and neutral current measurement
Siemens SIP · 2006 8/238 Transformer Differential Protection / 7UT6
Typical connections
Fig. 8/33
Voltage transformer connection
to 3 star-connected voltage transformers
(7UT613 and 7UT633 only)
8
Fig. 8/34
Voltage transformer connection
to 3 star-connected voltage transformers
with additional delta winding
(e-n-winding) (7UT613 and 7UT633 only)
8/24 Siemens SIP · 20068 Transformer Differential Protection / 7UT6
Technical data
General unit data Switching capacity
Analog inputs Make 1000 W / VA
Break 30 VA
Rated frequency 50 or 60 Hz (selectable) Break (with resistive load) 40 W
Rated current 0.1 or 1 or 5 A Break (with L/R w 50 ms) 25 W
(selectable by jumper, 0.1 A) Switching voltage 250 V
Power consumption 7UT Permissible total current 30 A for 0.5 seconds
In CT circuits 612 613 633 635 5 A continuous
with IN = 1 A; in VA approx. 0.02 0.05 0.05 0.05
Operating time, approx.
with IN = 5 A; in VA approx. 0.2 0.3 0.3 0.3
NO contact 8 ms
with IN = 0.1 A; in VA approx. 0.001 0.001 0.001 0.001
NO/NC contact (selectable) 8 ms
sensitive input; in VA approx. 0.05 0.05 0.05 0.05
Fast NO contact 5 ms
Overload capacity IN High-speed*) NO trip outputs < 1 ms
In CT circuits
LEDs
Thermal (r.m.s.) 100 IN for 1 s
30 IN for 10 s Quantity 7UT
4 IN continuous 612 613 633 635
Dynamic (peak value) 250 IN (half cycle) RUN (green) 1 1 1 1
In CT circuits for ERROR (red) 1 1 1 1
highly sensitive input IEE LED (red), function can 7 14 14 14
Thermal 300 A for 1 s be assigned
100 A for 10 s Unit design
15 A continuous
Dynamic 750 A (half cycle) Housing 7XP20 For dimensions please refer
to dimension drawings
Rated voltage (7UT613/633 only) 80 to 125 V
Power consumption per phase w 0.1 VA Degree of protection
at 100 V acc. to IEC 60529
For the device
Overload capacity in surface-mounting housing IP 51
Thermal (r.m.s.) 230 V continuous in flush-mounting housing
Auxiliary voltage front IP 51
rear IP 50
Rated voltage 24 to 48 V DC
60 to 125 V DC For personal safety IP 2x with closed protection cover 8
110 to 250 V DC and Housing 7UT
115 V AC (50/60 Hz), 230 V AC 612 613 633 635
Permissible tolerance -20 to +20 % Size, referred to 19” frame 1/3 1/2 1/1 1/1
Superimposed AC voltage w 15 % Weight, in kg
(peak-to-peak) Flush-mounting housing 5.1 8.7 13.8 14.5
Power consumption (DC/AC) 7UT Surface-mounting housing 9.6 13.5 22.0 22.7
612 613 633 635
Quiescent; in W approx. 5 6/12 6/12 6/12 Serial interfaces
Energized; in W approx. 7 12/19 20/28 20/28 Operating interface 1 for DIGSI 4 or browser
depending on design
Connection Front side, non-isolated, RS232,
Bridging time during 9-pin subminiature connector
failure of the auxiliary voltage (SUB-D)
Vaux W 110 V W 50 ms
Transmission rate in kbaud 7UT612: 4.8 to 38.4 kbaud
Binary inputs Setting as supplied: 7UT613/633/635: 4.8 to 115 kbaud
Functions are freely assignable 38.4 kbaud, parity 8E1
Quantity marshallable 7UT Distance, max. 15 m
612 613 633 635 Time synchronization DCF77 / IRIG-B signal / IRIG-B000
3 5 21 29
Connection Rear side, 9-pin subminiature
Rated voltage range 24 to 250 V, bipolar connector (SUB-D) (terminals with
Minimum pickup threshold 19 or 88 V DC (bipolar) surface-mounting housing)
Ranges are settable by means of Voltage levels 5, 12 or 24 V (optional)
jumpers for each binary input
Service interface (operating interface 2) for DIGSI 4 / modem / service
Maximum permissible voltage 300 V DC
Isolated RS232/RS485/FO 9-pin subminiature connector
Current consumption, energized Approx. 1.8 mA (SUB-D)
Output relay Dielectric test 500 V / 50 Hz
Command / indication / Distance for RS232 Max. 15 m / 49.2 ft
alarm relay Distance for RS485 Max. 1000 m / 3300 ft
Distance for FO 1.5 km (1 mile)
Quantity 7UT
each with 1 NO contact 612 613 633 635
(marshallable) 4 8 24 24
1 alarm contact, with 1 NO or
NC contact (not marshallable) *) With high-speed contacts all operating times are reduced by 4.5 ms.
Siemens SIP · 2006 8/258 Transformer Differential Protection / 7UT6
Technical data
System interface Electrical tests
IEC 61850 Specifications
Ethernet, electrical (EN 100) for IEC 61850 and DIGSI Standards IEC 60255 (Product standards)
Connection ANSI/IEEE C37.90.0/.1/.2
for flush-mounting case Rear panel, mounting location "B", UL 508
two RJ45 connector, 100 Mbit acc. Insulation tests
to IEEE802.3 Standards IEC 60255-5 and 60870-2-1
for surface-mounting case At bottom part of the housing
Test voltage 500 V; 50 Hz Voltage test (100 % test)
Transmission Speed 100 Mbits/s All circuits except for auxiliary 2.5 kV (r.m.s.), 50 Hz / 60 Hz
Distance 20 m/66 ft supply, binary inputs and
communication interfaces
Ethernet, optical (EN 100) for IEC 61850 and DIGSI
Auxiliary voltage and binary 3.5 kV DC
Connection inputs (100 % test)
for flush-mounting case Rear panel, mounting location "B",
ST connector receiver/transmitter RS485/RS232 rear side 500 V (r.m.s.), 50 Hz / 60 Hz
for surface-mounting case Not available communication interfaces
Optical wavelength λ = 1350 nm and time synchronization
Transmission Speed 100 Mbits/s interface (100 % test)
Laser class 1 acc. to EN 60825-1/-2 glass fiber 50/125 µm or Impulse voltage test (type test)
glass fiber 62/125µm All circuits except for 5 kV (peak); 1.2/50 µs; 0.5 J
Permissible path attenuation Max. 5 dB for glass fiber 62.5/125µm communication interfaces 3 positive and 3 negative impulses
Distance Max. 800 m/0.5 mile and time synchronization at intervals of 5 s
IEC 60870-5-103 interface, class III
Isolated RS232/RS485/FO 9-pin subminiature connector EMC tests for interference immunity
(SUB-D) Standards IEC 60255-6, 60255-22
Baud rate 4800 to 19200 baud (product standards)
Dielectric test 500 V/50 Hz EN 6100-6-2 (generic standard)
Distance for RS232 Max. 15 m DIN 57435 / Part 303
Distance for RS485 Max. 1000 m High frequency test 2.5 kV (peak); 1 MHz; τ = 15 ms;
For fiber-optic cable IEC 60255-22-1, class III and 400 surges per s; test duration 2 s;
8 Connector type ST connector DIN 57435 / Part 303, class III Ri = 200 Ω
Optical wavelength λ = 820 nm Electrostatic discharge 8 kV contact discharge; 15 kV air
Permissible attenuation Max. 8 dB, for glass-fiber 62.5/125 µm IEC 60255-22-2 class IV discharge; both polarities;
Distance Max. 1.5 km EN 61000-4-2, class IV 150 pF; Ri = 330 Ω
PROFIBUS RS485 (-FMS/-DP) Irradiation with RF field, 10 V/m; 80 to 1000 MHz;
Connector type 9-pin subminiature frequency sweep, 80 % AM; 1 kHZ
connector (SUB-D) IEC 60255-22-3,
Baud rate Max. 1.5 Mbaud IEC 61000-4-3 class III
Dielectric test 500 V / 50 Hz
Distance Max. 1000 m (3300 ft) Irradiation with RF field, amplitude- 10 V/m; 80, 160, 450, 900 MHz,
at w 93.75 kbaud modulated, single frequencies, 80 % AM;
IEC 60255-22-3, duration > 10 s
PROFIBUS fiber optic (-FMS/-DP) IEC 61000-4-3, class III
Only for flush-mounting hous- ST connector
ing Optical interface with OLM1) Irradiation with RF field, pulse- 10 V/m; 900 MHz; repetition
For surface-mounting housing Max. 1.5 Mbaud modulated, single frequencies, frequency 200 Hz;
Baud rate λ = 820 nm IEC 60255-22-3, IEC 61000-4-3/ duty cycle 50 % PM
Optical wavelength Max. 8 dB, for glass-fiber 62.5/125 µm ENV 50204, class III
Permissible attenuation 500 kbaud 1.6 km (0.99 miles) Fast transients interference, bursts 4 kV; 5/50 ns; 5 kHz;
Distance 1500 kbaud 530 m (0.33 miles) IEC 60255-22-4 and burst length = 15 ms;
IEC 61000-4-4, class IV repetition rate 300 ms; both
DNP 3.0 RS485 / MODBUS RS485 polarities;
Connector type 9-pin subminiatur connector (SUB-D) Ri = 50; test duration 1 min
Baud rate Max. 19200 baud High-energy surge voltages Impulse: 1.2/50 µs
Dielectric test 500 V / 50 Hz (SURGE), IEC 61000-4-5, installa-
Distance Max. 1000 m (3300 ft) tion class III
DNP 3.0 Optical/MODBUS FO Auxiliary supply Common (longitudinal) mode:
Connector type ST connector 2kV; 12 Ω, 9 µF
Optical wavelength λ = 820 nm Differential (transversal) mode:
Permissible attenuation Max. 8 dB, for glass-fiber 62.5/125 µm 1kV; 2 Ω, 18 µF
Distance 1.5 km (1 mile) Analog inputs, binary inputs, Common (longitude) mode:
binary outputs 2kV; 42 Ω, 0.5 µF
1) Conversion with external OLM Differential (transversal) mode:
For fiber-optic interface please complete Order No. at 11th position 1kV; 42 Ω, 0.5 µF
with 4 (FMS RS485) or 9 (DP RS485) and Order code L0A and addi- Line-conducted HF, amplitude- 10 V; 150 kHz to 80 MHz; 80 % AM;
tionally order: modulated IEC 61000-4-6, class III 1 kHz
For single ring: SIEMENS OLM 6GK1502-3AB10
For double ring: SIEMENS OLM 6GK1502-4AB10
8/26 Siemens SIP · 20068 Transformer Differential Protection / 7UT6
Technical data
Electrical tests (cont’d) Climatic stress tests
EMC tests for interference immunity (cont’d) Temperatures
Magnetic field with power frequency 30 A/m continuous; 300 A/m for 3 s; Type-tested acc. to IEC 60068-2-1 -25 °C to +85 °C / -13 °F to +185 °F
IEC 61000-4-8, IEC 60255-6 class IV 50 Hz, 0.5 mT; 50 Hz and -2, test Bd, for 16 h
Oscillatory surge withstand 2.5 kV (peak); 1 MHz; τ = 15 µs; Temporarily permissible operating -20 °C to +70 °C / -4 °F to +158 °F
capability, ANSI/IEEE C37.90.1 Damped wave; 400 surges per temperature, tested for 96 h
second; duration 2 s; Ri = 200 Ω Recommended permanent operating -5 °C to +55 °C / +25 °F to +131 °F
Fast transient surge withstand 4 kV; 5/50 ns; 5 kHz; burst 15 ms; temperature acc. to IEC 60255-6
capability, ANSI/IEEE C37.90.1 repetition rate 300 ms; (Legibility of display may be
both polarities; duration 1 min.; impaired above +55 °C / +131 °F)
Ri = 80 Ω – Limiting temperature during -25 °C to +55 °C / -13 °F to +131 °F
Damped oscillations 2.5 kV (peak value), polarity alternat- permanent storage
IEC 60894, IEC 61000-4-12 ing 100 kHz, 1 MHz, 10 MHz and – Limiting temperature during -25 °C to +70 °C / -13 °F to +158 °F
50 MHz, Ri = 200 Ω transport
EMC tests for interference emission (type test) Humidity
Standard EN 50081-* (generic standard) Permissible humidity stress Yearly average w 75 % relative
It is recommended to arrange the humidity; on 56 days in the year up
Conducted interference, 150 kHz to 30 MHz units in such a way that they are not to 93 % relative humidity;
only auxiliary supply Limit class B exposed to direct sunlight or condensation not permitted
IEC-CISPR 22 pronounced temperature changes
Radio interference field strenght 30 to 1000 MHz that could cause condensation.
IEC-CISPR 22 Limit class B
CE conformity
Mechanical stress tests This product is in conformity with the Directives of the European
Vibration, shock stress and seismic vibration Communities on the harmonization of the laws of the Member States re-
During operation lating to electromagnetic compatibility (EMC Council Directive
89/336/EEC) and electrical equipment designed for use within certain volt-
Standards IEC 60255-21 and IEC 60068
age limits (“Low voltage” Council Directive 73/23/EEC).
Vibration Sinusoidal
This unit conforms to the international standard IEC 60255, and the
IEC 60255-21-1, class 2 10 to 60 Hz: ± 0.075 mm amplitude;
IEC 60068-2-6 60 to 150 Hz: 1 g acceleration
German standard DIN 57435/Part 303 (corresponding to VDE 0435/ 8
Part 303).
frequency sweep 1 octave/min.
20 cycles in 3 orthogonal axes Further applicable standards: ANSI/IEEE C37.90.0 and C37.90.1.
Shock Half-sinusoidal This conformity is the result of a test that was performed by Siemens AG in
IEC 60255-21-2, class 1 acceleration 5 g, duration 11 ms, accordance with Article 10 of the Council Directive complying with the ge-
IEC 60068-2-27 3 shocks each in both directions of neric standards EN 50081-2 and EN 50082-2 for the EMC Directive and
the 3 axes standard EN 60255-6 for the “low-voltage Directive”.
Seismic vibration Sinusoidal
IEC 60255-21-2, class 1 1 to 8 Hz: ± 3.5 mm amplitude
IEC 60068-3-3 (horizontal axis)
1 to 8 Hz: ± 1.5 mm amplitude
(vertical axis)
8 to 35 Hz: 1 g acceleration
(horizontal axis)
8 to 35 Hz: 0.5 g acceleration
(vertical axis)
frequency sweep 1 octave/min
1 cycle in 3 orthogonal axes
During transport
Standards IEC 60255-21 and IEC 60068
Vibration Sinusoidal
IEC 60255-21-1, class 2 5 to 8 Hz: ± 7.5 mm amplitude;
IEC 60255-2-6 8 to 150 Hz: 2 g acceleration
frequency sweep 1 octave/min
20 cycles in 3 orthogonal axes
Shock Half-sinusoidal
IEC 60255-21-2, class 1 acceleration 15 g, duration 11 ms,
IEC 60068-2-27 3 shocks each in both directions of
the 3 axes
Continuous shock Half-sinusoidal
IEC 60255-21-2, class 1 acceleration 10 g, duration 16 ms,
IEC 60068-2-29 1000 shocks on each of the 3 axes in
both directions
Siemens SIP · 2006 8/278 Transformer Differential Protection / 7UT6
Technical data
Functions Generators, motors, reactors
Differential protection Operating times
General Pickup time/dropout time with sin-
Pickup values gle-side infeed
Differential current IDIFF > /INobj 0.05 to 2.00 (steps 0.01) Pickup time (in ms) at frequency 50 Hz 60 Hz
High-current stage IDIFF >> /INobj 0.5 to 35.0 (steps 0.1) 7UT 612
or deactivated (stage ineffective) IDIFF >, min. 38 35
IDIFF >>, min. 19 17
Pickup on switch-on 1.0 to 2.0 (steps 0.1)
(factor of IDIFF >) Dropout time (in ms), approx. 35 30
Add-on stabilization on external fault 2.00 to 15.00 (steps 0.01) 7UT 613/63x
(ISTAB > set value) Iadd-on /INobj 2 to 250 cycles (steps 1 cycle) IDIFF >, min. 30 27
action time or deactivated (effective until dropoff) IDIFF >>, min. 11 11
Tolerances (at preset parameters) Dropout time (in ms), approx. 54 46
IDIFF > stage and characteristic 5 % of set value Dropout ratio, approx. 0.7
IDIFF >> stage 5 % of set value Busbars, short lines
Time delays Differential current monitor
Delay of IDIFF > stage TI-DIFF> 0.00 to 60.00 s (steps 0.01 s) Steady-state differential 0.15 to 0.80 (steps 0.01)
or deactivated (no trip) current monitoring
Delay of IDIFF >> stage TI-DIFF >> 0.00 to 60.00 s (steps 0.01 s) IDIFF mon/INobj
or deactivated (no trip) Delay of blocking with differential 1 to 10 s (steps 1 s)
Time tolerance 1 % of set value or 10 ms current monitoring
The set times are pure delay times TDIFF mon
Transformers Feeder current guard
Harmonic stabilization Trip release Iguard/INobj 0.20 to 2.00 (steps 0.01)
by feeder current guard or 0 (always released)
Inrush restraint ratio 10 to 80 % (steps 1 %)
(2nd harmonic) I2fN/IfN Operating times
Stabilization ratio further (n-th) 10 to 80 % (steps 1 %) Pickup time/dropout time with sin-
8 harmonic (optional 3rd or 5th) gle-side infeed
InfN/IfN Pickup time (in ms) at frequency 50 Hz 60 Hz
Crossblock function Can be activated / deactivated 7UT 612
max. action time for crossblock 2 to 1000 AC cycles (steps 1 cycle) IDIFF >, min. 25 25
or 0 (crossblock deactivated) IDIFF >>, min. 19 17
or deactivated (active until dropout)
Dropout time (in ms), approx. 30 30
Operating times
7UT 613/63x
Pickup time/dropout time with sin- IDIFF >, min. 11 11
gle-side infeed IDIFF >>, min. 11 11
Pickup time (in ms) at frequency 50 Hz 60 Hz Dropout time (in ms), approx. 54 46
7UT 612 Dropout ratio, approx. 0.7
IDIFF >, min. 38 35
IDIFF >>, min. 19 17
Dropout time (in ms), approx. 35 30
7UT 613/63x
IDIFF >, min. 30 27
IDIFF >>, min. 11 11
Dropout time (in ms), approx. 54 46
Dropout ratio, approx. 0.7
Current matching for transformers
Vector group adaptation 0 to 11 (x 30 °) (steps 1)
Star-point conditioning Earthed or non-earthed
(for each winding)
8/28 Siemens SIP · 20068 Transformer Differential Protection / 7UT6
Technical data
Restricted earth-fault protection Current stages (cont’d)
Multiple availability 2 times (option) Tolerances
Settings Definite time Currents 3 % of set value or 1 % of rated current
Times 1 % of set value or 10 ms
Differential current IREF >/INobj 0.05 to 2.00 (steps 0.01)
Inverse time Currents Pickup at 1.05 w I/IP w 1.15;
Limit angle ϕ REF 110 ° (fixed) or 1.05 w I/3IOP w 1.15
Time delay TREF 0.00 to 60.00 s (steps 0.01 s) Acc. to IEC Times 5 % ± 15 ms at fN = 50/60 Hz
or deactivated (no trip) for 2 w I/IP w 20
The set times are pure delay times and TIP/s W 1;
Operating times or 2 w I/3I0P w 20
Pickup time (in ms) at frequency 50 Hz 60 Hz and T3I0P/s W 1
7UT 612 40 38 Acc. to ANSI Times 5 % ± 15 ms at fN = 50/60 Hz
At 1.5 · setting value IREF >, approx. 37 32 for 2 w I/IP w 20
At 2.5 · setting value IREF >, approx. 40 40 and DIP/s W 1;
or 2 w I/3I0P w 20
Dropout time (in ms), approx. and D3I0P/s W 1
7UT 613/63x 35 30
The set definite times are pure delay times.
At 1.5 · setting value IREF >, approx. 33 29
At 2.5 · setting value IREF >, approx. 26 23 Operating times of the definite-time stages
Dropout time (in ms), approx. 0.7 Pickup time/dropout time phase current stages
Dropout ratio, approx. Pickup time (in ms) at frequency 50 Hz 60 Hz
Overcurrent-time protection for phase and residual currents 7UT612
Multiple availability 3 times (option) Without inrush restraint, min. 20 18
Characteristics With inrush restraint, min. 40 35
Definite-time stages (DT) IPh >>, 3I0 >>, IPh >, 3I0 > Dropout time (in ms), approx. 30 30
Inverse-time stages (IT) IP, 3I0P 7UT613/6x
Acc. to IEC Inverse, very inverse, extremely Without inrush restraint, min. 11 11
inverse, long-time inverse
With inrush restraint, min. 33 29
Acc. to ANSI Inverse, moderately inverse, very
inverse, extremely inverse, definite
Dropout time (in ms), approx. 35 35 8
inverse, short inverse, long inverse Pickup time/dropout time residual current stages
Alternatively, user-specified Pickup time (in ms) at frequency 50 Hz 60 Hz
trip and reset characteristics 7UT 612
Reset characteristics (IT) Acc. to ANSI with disk emulation Without inrush restraint, min. 40 35
Current stages With inrush restraint, min. 40 35
High-current stages IPh >> 0.10 to 35.00 A 1) (steps 0.01 A) Dropout time (in ms), approx. 30 30
or deactivated (stage ineffective)
7UT613/6x
TIPh >> 0.00 to 60.00 s (steps 0.01 s)
Without inrush restraint, min. 21 19
or deactivated (no trip)
3I0 >> 0.05 to 35.00 A 1) (steps 0.01 A) With inrush restraint, min. 31 29
or deactivated (stage ineffective) Dropout time (in ms), approx. 45 43
T3I0 >> 0.00 to 60.00 s (steps 0.01 s) Dropout ratios
or deactivated (no trip)
Current stages Approx. 0.95 for I/IN W 0.5
Definite-time stages IPh > 0.10 to 35.00 A 1) (steps 0.01 A)
or deactivated (stage ineffective) Inrush blocking
TIPh 0.00 to 60.00 s (steps 0.01 s) Inrush blocking ratio 10 to 45 % (steps 1 %)
or deactivated (no trip) (2nd harmonic) I2fN/IfN
3I0 > 0.05 to 35.00 A 1) (steps 0.01 A) Lower operation limit I > 0.2 A 1)
or deactivated (stage ineffective)
Max. current for blocking 0.30 to 25.00 A 1) (steps 0.01 A)
T3I0 > 0.00 to 60.00 s (steps 0.01 s)
or deactivated (no trip) Crossblock function between phases Can be activated/deactivated
max. action time for crossblock 0.00 to 180 s (steps 0.01 A)
Inverse-time stages IP 0.10 to 4.00 A 1) (steps 0.01 A)
Acc. to IEC TIP 0.05 to 3.20 s (steps 0.01 s)
or deactivated (no trip)
3I0P 0.05 to 4.00 A 1) (steps 0.01 A)
T3I0P 0.05 to 3.20 s (steps 0.01 s)
or deactivated (no trip)
Inverse-time stages IP 0.10 to 4.00 A 1) (steps 0.01 A)
Acc. to ANSI DIP 0.50 to 15.00 s (steps 0.01 s)
or deactivated (no trip)
3I0P 0.05 to 4.00 A 1) (steps 0.01 A)
D3I0P 0.50 to 15.00 s (steps 0.01 s) 1) Secondary values based on IN = 1 A;
or deactivated (no trip) for IN = 5 A they must be multiplied by 5.
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