Siemens SIPROTEC 7SJ81 User manual

E50417-K1150-C462-A2
SIPROTEC
7SJ81/7SK81
V4.7
Product Information

Siemens Aktiengesellschaft Order No.: E50417-K1150-C462-A2
Subject to change without prior notice.
Document Release V04.01.01
Edition 02.2012
Note
Please observe Notes and Warnings for your own safety in Chapter 2.
Note
This Product Information contains important information about the
SIPROTEC-device 7SJ81/7SK81.
It is part of the product supplied, and the information in it should be
considered more up-to-date than any other information if uncertainties
arise.

3SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
Table of Contents
1 General 4
2 Safety Information 5
3 Statement of Conformity 7
4 Unpacking and Re-Packing 8
5 Storage and Transport 9
6 Functional Description 10
7 Dimensions 19
8 Installation Notes 20
9 Connection Notes 21
10 Limit Values of Inputs and Outputs 33
11 Ordering Data 35
12 General Diagrams and Connection Diagrams 42
13 Operating Pre-conditions 51

4SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
1 General
Disclaimer of Liability
Although we have carefully checked the contents of this publication for
conformity with the hardware and software described, we cannot guaran-
tee complete conformity since errors cannot be excluded.
The information provided in this Product Information is checked at regular
intervals and any corrections that might become necessary are included
in the next releases. Any suggestions for improvement are welcome.
Subject to change without prior notice.
Copyright
Copyright © Siemens AG 2012
The reproduction, transmission or use of this document or its contents is
not permitted without express written authority. Offenders will be liable for
damages.All rights,includingrightscreatedbypatentgrantor registration
of a utility model or design, are reserved.
Registered Trademarks
SIMATIC, SIMATIC NET, SIPROTEC, DIGSI, SIMEAS, SICAM and
SINAUTareregistered trademarksofSIEMENSAG. Allotherproductand
brandnamesinthismanualmightbetrademarks,the useofwhich bythird
personsfortheir purposesmightinfringe the rights of theirrespective own-
ers.
Note:
For further information see:
SIPROTEC 7SJ80 V4.60, Manual E50417-G1140-C343
SIPROTEC 7SK80 V4.60, Manual E50417-G1140-C344
SIPROTEC System Description E50417-H1176-C151
ReadMe-USB.pdf for DIGSI V4.82 (www.siprotec.com)

5SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
2 Safety Information
This manual is not a complete index of all safety measures required for
operation of the equipment (module, device). However, it comprises im-
portant information that must be noted for purposes of personal safety, as
well as in order to avoid material damage. Information is highlighted and
illustrated as follows according to the degree of danger:
DANGER
DANGER means that death or severe injury will result if the measures
specified are not taken.
•Comply with all instructions, in order to avoid death or severe injuries.
WARNING
WARNING means that death or severe injury may result if the measures
specified are not taken.
•Comply with all instructions, in order to avoid death or severe injuries.
CAUTION
CAUTION means that or medium-severe or slight injuries can occur if the
specified measures are not taken.
•Complywithallinstructions,inordertoavoidmoderateorminorinjuries.
NOTICE
NOTICE means that property damage can result if the measures speci-
fied are not taken.
•Comply with all instructions, in order to avoid property damage.

6SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
Qualified Electrical Engineering Personnel
Only qualified electrical engineering personnel may commission and
operate the equipment (module, device) described in this document.
Qualified electrical engineering personnel in the sense of this manual are
people who can demonstrate technical qualifications as electrical techni-
cians.These personsmay commission,isolate, groundandlabeldevices,
systems and circuits according to the standards of safety engineering.
Use as Prescribed
The equipment (device, module) may only be used for such applications
as set out in the catalogs and the technical description, and only in com-
bination with third-party equipment recommended and approved by Sie-
mens.
Problem-free and safe operation of the product depends on the following:
•Proper transport
•Proper storage, setup and installation
•Proper operation and maintenance
When electrical equipment is operated, hazardous voltages are inevita-
bly present in certain parts. If proper action is not taken, death, severe
injury or property damage can result.
•The equipment must be grounded at the grounding terminal before any
connections are made.
•All circuit components connected to the power supply may be subject
to dangerous voltage.
•Hazardousvoltagesmaybepresentin equipmentevenafter thesupply
voltage has been disconnected (capacitors can still be charged).
•Equipment with exposed current transformer circuits must not be oper-
ated.
•The limit values stated in the document may not be exceeded. This
must also be considered during testing and commissioning.
NOTE
Important information about the product, product handling or a certain
section of the documentation, which must be given particular attention.

7SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
3 Statement of Conformity
FurtherIEEE Std C37.90
This product complies with the directive of the Council of the European
Communities on the approximation of the laws of the Member States
relating to electromagnetic compatibility (EMC Council Directive 2004/
108/EC) and concerning electrical equipment for use within specified
voltage limits (Low-voltage Directive 2006/95/EC).
This conformity has been established by means of tests conducted by
Siemens AG in accordance of the Council Directive in agreement with
the generic standards EN 61000-6-2 and EN 61000-6-4 for the EMC
directives, and with the standard EN 60255-27 for the low-voltage
directive.
The device has been designed and produced for industrial use.
The product is conforming to the international standards of the series
IEC 60255 and the German regulation of VDE 0435.
NOTE concerning battery disposal
The batteries must only be replaced with the same type or another type
recommended by the manufacturer. Improper replacement involves
explosion hazard. For disposing the batteries it is necessary to observe
the local national/international directives.

8SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
4 Unpacking and Re-Packing
When dispatched from the factory, the equipment is packed in accor-
dance with the guidelines laid down in IEC 60255-21 which specify the
impact resistance of packaging.
Thispackingshall beremovedwithcare,withoutforceandwithouttheuse
of inappropriate tools. The equipment should be visually checked to
ensure that there are no external traces of damage.
Please observe absolutely all notes and hints which may be enclosed in
the packaging.
Before initial energization with supply voltage, or after storage, the relay
shall be situated in the operating area for at least two hours in order to
ensure temperature equalization and to avoid humidity influences and
condensation.

9SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
5 Storage and Transport
SIPROTEC relays should be stored in dry and clean rooms. The limit tem-
perature range for storage of the relays or associated spare parts is
−25 °C to +55 °C, corresponding to −13 °F to 131 °F.
The relative humidity must be within limits such that neither condensation
nor ice forms.
It is recommended to reduce the storage temperature to the range
+10 °C to +35 °C (50 °F to 95 °F); this prevents early ageing of the
electrolytic capacitors which are contained in the power supply.
For very long storage periods, it is recommended to connect the relay to
the auxiliary voltage source for one or two days every other year, in order
to regenerate the electrolytic capacitors. The same is valid before the
relay is finally installed.
For further transport, the transport packing can be re-used when applied
in the same way. The storage packing of the individual relays is not suited
for transport. If alternative packing is used, this must also provide the
same degree of protection against mechanical shock and vibration as laid
down in IEC 60255-21-1 class 1 and IEC 60255-21-2 class 1.
The Lithium batteries in our equipment are subject to Special
Provision 188 of the UN Recommendations on the Transport of Danger-
ous Goods Model Regulations and Special Provision A45 of the IATA
Dangerous Goods Regulation and the ICAO Technical Instructions. This
is only valid for the original battery or original spare batteries.

10 SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
6 Functional Description
General
Unlike the 7SJ80/7SK80, the SIPROTEC device 7SJ81/7SK81 has 4 low-
power current transformers (LPCT) inputs and optionally 3 low-power
voltage transformers (LPVT) inputs. One low-power current transformer
(LPCT) is sufficient to cover a very large range of primary rated line
currents. Objects with rated currents in the range from 40 A to 5000 A can
be protected when using low-power current transformers. The following
low-power current transformer ratios are suitable for the following primary
current operating ranges:
•100 A/225 mV for a primary operating current range of 40 A to 600 A
•50 A/22.5 mV for a primary operating current range of 200 A to 3000 A
•400 A/225 mV for a primary operating current range of 200 A to 2500 A
•100 A/22.5 mV for a primary operating current range of 400 A to
5000 A
Resistive voltage dividers are provided aslow-power voltagetransformers
(LPVT). This product information describes device-specific modifications
compared to the 7SJ80 manual (order number E50417-G1140-C343) and
the 7SK80 manual (order number E50417-G1140-C344). The manuals
provide more detailed information.

11SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
The SIPROTEC devices 7SJ81 and 7SK81 feature protection functions
similar to the 7SJ80 and 7SK80 devices, which are described in the
following table.
Package Function 7SJ81 7SK81
Basic func-
tionality 50/51 Time overcurrent protection phase 50-1, 50-2, 50-3, 51 XX
50N/51N Time overcurrent protection ground
50N-1, 50N-2, 50N-3, 51N XX
50N(s)/51N(s) Sensitive ground fault protection
50Ns-1, 50Ns-2, 51Ns XX
49 Overload protection XX
74TC Trip circuit supervision XX
50BF Circuit-breaker failure protection XX
46 Negative-sequence protection XX
37 Undercurrent monitoring XX
86 Lockout XX
Parameter changeover XX
Monitoring functions XX
Control of circuit-breaker XX
Flexible protection functions (current parameters) XX
Inrush restraint XX
48 Start time supervision X
Motor statistics X
14 Locked rotor protection X
51M Load jam protection X
66/86 Restart blocking X

12 SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
Due to the use of low-power current transformers, no physical current sum
can be formed. Therefore the Holmgreen connection and with it the fast
current sum monitoring or for example, the high-impedance ground-fault
differential protection is not possible.
Ratio of the Low-Power Current Transformers
The 7SJ81/7SK81 is equipped with 4 current measuring inputs for low-
power current transformers. The parameters 311 Iph-LPCT PRIM and
314 Uph-LPCT SEC allow you to set the transformation ratio of the low-
power current transformers for the 3 phases of the device.
With the parameters 313 Ignd-LPCT PRIM and 315 Ugnd-LPCT SEC,
you can set the transformation ratio of an optional low-power current
transformer for the ground current input.
An LPCT with a secondary voltage U-LPCT SEC higher than 1000 mV can
be parameterized by applying a linear transformation to the conversion
ratio.
Example: For split core LPCT with a conversion ratio 60 A : 7000 mV, the
parameters can be set as follows:
313 Ignd-LPCT PRIM = 6 A
315 Ugnd-LPCT SEC = 700 mV
Package Function 7SJ81 7SK81
Additional
functionality 67 Directional overcurrent protection phase 67-1, 67-2, 67-3 X
67N Directional overcurrent protection ground
67N-1, 67N-2, 67N-3 XX
67N(s)1 Directional sensitive ground fault protec-
tion 67N(s)-1, 67N(s)-2, 67N(s)-3 XX
59N Displacement voltage XX
27/59 Under/Overvoltage XX
81 U/O Under/Overfrequency, f<, f> XX
47 Phase rotation XX
32/55/81R Flexible protection functions (current
and voltage parameters), Protective function for
voltage, power, power factor, frequency change
XX
Additional
functions Automatic Reclosing (AR) X
Fault Locator (FL) X

13SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
The LPCT can have a nominal burden higher than the input impedance of
the connected protection devices, e.g. if several devices are connected to
the LPCT. This results in a linear amplitude distortion of the measured
current. Given the shunt resistance of the LPCT, the distortion can be
calculated. The correction factor parameters 320A IL1 Corr.factor,
321A IL2 Corr.factor, 322A IL3 Corr.factor, 323A
Corr.factor IE und 324A Corr.factor IEE allow compensating
the distortion.
Rated Value of the Primary Object
With the parameter 310 Iph-PRIM ref., you can set the rated current
of the primary object. (This is equivalent to parameter 204 CT PRIMARY
for the 7SJ80).
With the parameter 312 Ignd-PRIM ref., you can set the reference
rated ground current of the object. (This is equivalent to parameter
217 Ignd-CT PRIM for the 7SJ80).
Additional Parameters
With parameter 132 Earth CT, you can set the measuring mode of the
device for ground currents in the menu “Device“. If you want to measure
small ground currents using a sensitive low-power current transformer,
use the sensitive setting. If you want to measure large ground currents
using a normal low-power current transformer, use the normal setting.
With parameter 252 Ph LPCT pol., you can set the polarity of the LPCT
currents.
If the parameters settings of the LPCT current measuring inputs are
invalid and impair the protection functionality, the indications 232 CT ph
mismatch or 233 CT gnd mismatch are output.

14 SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
Parameters of the Low-Power Voltage Transformers
With parameter 330 U-LPVT SEC, you can set the rated input voltage.
Parameter 332A U-LPVT PHA allows you to correct the phase offset
between current transformer and voltage transformer.
The rated low-power input voltage is not used subsequently. The input
signal is converted to a virtual secondary voltage. Parameter 0203
Vrated SECONDARY allows you to set the virtual secondary rated
voltage. It serves as reference for all functions that use secondary values,
such as the parameterization in DIGSI and the display of the secondary
measured values. The setting affects the measuring range of the device.

15SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
Setting Notes
Check whether the low-power current transformer used matches the input
measuring range of the 7SJ81/7SK81 (0 V to 17.7 V) and whether the
possible primary currents match.
The maximum measurable current can be determined using the following
equation:
Imax = RELlpct * Vmax
where RELlpct = Iph-LPCT PRIM/Uph-LPCT SEC and Vmax = 17.7 V
Example:
Iph-LPCT PRIM = 50 A
Uph-LPCT SEC = 22.5 mV
Imax = (50 A/22.5 mV) * 17.7 V = 39.3 KA
At rated current, the voltages at the input terminals of the protection
device should not be too small (Vrated min = 45 mV).
The smallest possible rated current can be determined using the following
equation:
Irated_min = RELlpct * Vrated_min
where
RELlpct = Iph-LPCT PRIM/Uph-LPCT SEC and Vrated_min = 45 mV
Example:
Iph-LPCT PRIM = 50 A
Uph-LPCT SEC = 22.5 mV
Irated_min = (50 A/22.5 mV) * 45 mV = 100 A
Note
When setting the parameters, make sure to observe the limiting values.
If the rated current is large (Iph-PRIM ref = 2.5 kA) and
RELlpct = Iph-LPCT PRIM/Uph-LPCT SEC = 100 A/225 mV = 444 A/V
is small, it is possible, that the setting value for I>> = 10 Irated is never
reached because of measuring-range violation (measuring range max.
17.7 V). For example, VPHYSICAL = 10 * (2500 A/444.44 A/V) = 56.25 V.

16 SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
Sensitivity for the Ground Current Measurement
If you want to measure very small ground currents, you have to use an
appropriate low-power current transformer with the corresponding ratio.
The measuring signal applying at the device should not become smaller
than 2 mV. With a ground current of only 0.1 A, a low-power current
transformer with 10 A/225 mV for example ensures that a sufficiently large
signal of 2.25 mV is generated for the measurement. If you want to use a
sensitive low-power current transformer, you have to communicate this to
the protection device by setting the parameter 132 Earth CT corre-
spondingly.
The use of a sensitive low-power current transformer requires the value of
the characteristic quantity Vrated, ground to range between 2250 mV and
225 000 mV.
You can specify Vrated, ground by setting the 3 parameters 312 Ignd-
PRIM ref., 313 Ignd-LPCT PRIM, and 315 Ugnd-LPCT SEC.
We obtain the value for Vrated, ground from the following equation:
Value range of Vrated, ground Setting for Earth CT
45 mV ≤Vrated, ground ≤2250 mV Normal
2250 mV <Vrated, ground ≤225 000 mV Sensitive
Vrated, ground < 45 mV
or
Vrated, ground > 225 000 mV
The acquisition of the meas-
ured value is not possible.
The device is blocked and the
indication 233 CT gnd
mismatch is output.
Vrated ground,Ignd-PRIM ref. Ugnd-LPCT SEC•
Ignd-LPCT PRIM
----------------------------------------------------------------------------------------------------- (in mV)=

17SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
Parameter Overview
In addition to the parameters described in the manuals 7SJ80
(E50417-G1100-C343) and 7SK80 (E50417-G1100-C344) in Appendix
A.8, the following parameters or setting values apply.
The following parameters have changed setting values:
613A Gnd O/Cprot. w. now has the default setting
3I0 (calcul.) instead of Ignd (measured).
280 Holmgr. for Σi is now permanently set to NO by default.
Addr. Parameter Function C Setting Options Default Setting Comments
132 Earth CT Device Sensitive
Normal Sensitive Earth CT
252 Ph LPCT pol. P.System Data 1 not reversed
reversed not reversed Phase LPCT orien- tation/polarity
310 Iph-PRIM ref. P.System Data 1 10 .. 50000 A 400 A Primary refer.
phase current for
protection
311 Iph-LPCT PRIM P.System Data 1 1 .. 5000 A 400 A Rated primary
phase current
LPCT
312 Ignd-PRIM ref. P.System Data 1 1 .. 50000 A 60 A Primary refer.
ground current for
prot.
313 Ignd-LPCT PRIM P.System Data 1 0.01 .. 5000.00 A 2.00 A Rated primary
ground current
LPCT
314 Uph-LPCT SEC P.System Data 1 10 .. 1000 mV 225 mV Rated secondary
phase voltage
LPCT
315 Ugnd-LPCT SEC P.System Data 1 10 .. 1000 mV 225 mV Rated secondary
ground voltage
LPCT
330 U-LPVT SEC P.System Data 1 3.00 .. 17.00 V 3.25 V rated secondary
voltage LPCT
320A IL1 Corr.factor P.System Data 1 0.9000 .. 1.1000 1.0000 Correction factor
for magnitude IL1
321A IL2 Corr.factor P.System Data 1 0.9000 .. 1.1000 1.0000 Correction factor
for magnitude IL2
322A IL3 Corr.factor P.System Data 1 0.9000 .. 1.1000 1.0000 Correction factor
for magnitude IL3
323A Corr.factor IE P.System Data 1 0.9000 .. 1.1000 1.0000 Correction factor
for magnitude IE
324A Corr.factor IEE P.System Data 1 0.9000 .. 1.1000 1.0000 Correction factor
for magnitude IEE
332A U-LPVT PHA P.System Data 1 -10.00 .. 10.00 o0.00 ophase angle LPCT

18 SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
Information overview
In addition to the indications described in the manuals 7SJ80 (E50417-
G1100-C343) and 7SK80 (E50417-G1100-C344) in Appendix A.9, the
following indications apply.
No. Description Func-
tion Type of
Infor
ma-
tion
Log Buffers Configurable in
Matrix IEC 60870-5-103
Event Log ON/OFF
Trip (Fault) Log ON/OFF
Ground Fault Log ON/OFF
Marked in Oscill. Record
LED
Binary Input
Function Key
Relay
Chatter Suppression
Type
Information Number
Data Unit
General Interrogation
232 LPCT phase Current
Transf. mismatching
(CT ph mismatch)
Device,
General OUT On Off * LED BO
233 LPCT ground Current
Transf. mismatching
(CT gnd mismatch)
Device,
General OUT On Off * LED BO

19SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
7 Dimensions
Figure 1 Dimensional drawing of a 7SJ81/7SK81 for panel flush or
cubicle mounting (housing size 1/6)
Figure 2 Bottom view of a 7SJ81/7SK81 (housing size 1/6)
Note
An angle strip set (contains upper and lower mounting brackets) (Order-
No. C73165-A63-D200-1) is necessary to install the device in a rack.
Using the Ethernet interface it might be necessary to rework the lower
mounting bracket.

20 SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
8 Installation Notes
Housing for installation in panels, racks, or cubicles
Remove the 2 covers at the top and bottom of the front cover. Thus,
4 elongated holes are revealed in the mounting bracket and can be
accessed.
Insert the device into the panel cut-out and fasten it with four screws.
Mount the 2 covers again.
Connect a solid low-ohmic protective and operational ground to the
grounding terminal of the device. The cross-section of the cable used
must correspond to the maximum connected cross-section but must be at
least 2.5 mm2.
If the device was opened, for example, to replace the fuse or the commu-
nication module, make sure that the RJ45 connectors are inserted prop-
erly into the housing cutouts of the rear wall when you insert electronics
into the housing.
NOTICE
Beware of electrostatic discharge. Non-observance of the safety notes
can result in material damage.
•The printed circuit boards of digital equipment contain CMOS circuits.
These shall not be withdrawn or inserted under live conditions!
•The modules must be so handled that any possibility of damage due to
static electrical charges is excluded. During any necessary handling of
individual modules or printed circuit boards the recommendations relat-
ing to the handling of electro-statically endangered components (EEC)
must be observed. In installed conditions, the modules are in no danger.