Siemens SIPROTEC 7SS60 User manual

E50417-G1176-C132-A2
SIEMENS
SIPROTEC 7SS60 V3.1
Centralized Numerical Busbar Protection

E50417-G1176-C132-A2
SIPROTEC
Centralized Numerical
Busbar Protection
7SS60
3.1
Manual
,QWURGXFWLRQ 1
'HVLJQDQG&RQQHFWLRQ6\VWHP 2
*HWWLQJ6WDUWHG 3
&RQILJXUDWLRQ 4
)XQFWLRQV 5
&RQWUROLQ2SHUDWLRQ 6
,QVWDOODWLRQDQG&RPPLVVLRQLQJ 7
0DLQWHQDQFHDQG7URXEOHVKRRWLQJ 8
7HFKQLFDO'DWD 9
$SSHQGL[ A

Siemens Aktiengesellschaft Document No. E50417-G1176-C132-A2

i7SS60 Manual
E50417-G1176-C132-A2
Preface
Aim of this manual This manual describes the functions, operation, installation, and commissioning of the
device. In particular, you will find:
•Description of the system configuration →Chapter 4;
•Description of the system functions and setting possibilities →Chapter 5;
•Hints on control during operation →Chapter 6;
•Instructions for installation and commissioning →Chapter 7;
•List of the technical data →Chapter 9;
•Summary of the most significant data for the experienced user in the Appendix.
Target audience Protection engineers, commissioners, persons who are involved in setting, testing and
maintenance of protection, automation, and control devices, as well as operation per-
sonnel in electrical plants and power stations.
Validity of this
manual This manual is valid for: SIPROTEC 7SS60; firmware version 3.1.
Additional support For any questions concerning your SIPROTEC system, please contact your Siemens
representative.
Training courses Individual course offers may be found in our Training Catalog, or questions can be di-
rected to our training centre.
Indication of Conformity
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 89/336/EEC) and concerning electrical equip-
ment for use within specified voltage limits (Low-voltage directive 73/23 EEC).
Conformity is proved by tests conducted by Siemens AG in accordance with Article 10
of the Council Directive in agreement with the generic standards EN 50081 and EN
50082 (for EMC directive) and the standards EN 60255-6 (for low-voltage directive).
The device is designed in accordance with the international standards of IEC 255 and
the German standards DIN 57 435 part 303 (corresponding to VDE 0435 part 303).

Preface
ii 7SS60 Manual
E50417-G1176-C132-A2
Instructions and
warnings The warnings and notes contained in this manual serve for your own safety and for an appropriate lifetime of the device. Please observe them!
The following terms and definitions are used:
DANGER
indicates that death, severe personal injury or substantial property damage will result
if proper precautions are not taken.
Warning
indicates that death, severe personal injury or substantial property damage can result
if proper precautions are not taken.
Caution
indicates that minor personal injury or property damage can result if proper precau-
tions are not taken. This is especially valid for damage on or in the device itself and
consequential damage thereof.
Note
indicates information about the device or respective part of the instruction manual
which is essential to highlight.
QUALIFIED PERSONNEL
For the purpose of this instruction manual and product labels, a qualified person is one
who is familiar with the installation, construction and operation of the equipment and
the hazards involved. In addition, he or she has the following qualifications:
•Is trained and authorized to energize, de-energize, clear, ground and tag circuits
and equipment in accordance with established safety practices.
•Is trained in the proper care and use of protective equipment in accordance with es-
tablished safety practices.
•Is trained in rendering first aid.
Warning!
Hazardous voltages are present in this electrical equipment during operation. Non–
observance of the safety rules can result in severe personal injury or property dam-
age.
Only qualified personnel shall work on and around this equipment after becoming thor-
oughly familiar with all warnings and safety notices of this manual as well as with the
applicable safety regulations.
The successful and safe operation of this device is dependent on proper handling, in-
stallation, operation, and maintenance by qualified personnel under observance of all
warnings and hints contained in this manual.
In particular the general erection and safety regulations (e.g. IEC, DIN, VDE, EN or
other national and international standards) regarding the correct use of hoisting gear
must be observed. Non–observance can result in death, personal injury or substantial
property damage.

Preface
iii
7SS60 Manual
E50417-G1176-C132-A2
Typographical and
symbol
conventions
The following text formats are used when literal information from the device or to the
device appear in the text flow:
3DUDPHWHUQDPHV, i.e. designators of configuration or function parameters, which
may appear word-for-word in the display of the device or on the screen of a personal
computer (with DIGSI 3), are marked in bold letters of a monospace type style.
3DUDPHWHURSWLRQV, i.e. possible settings of text parameters, which may appear
word-for-word in the display of the device or on the screen of a personal computer
(with DIGSI 3), are written in italic style, additionally. This applies also for options in
menus.
“$QQXQFLDWLRQV”, i.e. designators for information, which may be output by the relay
or required from other devices or from the switch gear, are marked in a monospace
type style in quotes.
Deviations may bepermitted in drawings when the type ofdesignator can be obviously
derived from the illustration.
The other symbols used are mainly taken from the standards IEC 60617–12 and
IEC 60617–13, or derived from them.
and the possible states 2Q and 2II
UL1–L2
(DUWKIDXOW
Internal logical input signal of the device
(DUWKIDXOW
Internal logical output signal of the device
Incoming internal signal of an analog magnitude
!5HOHDVH
External binary input signal with function number FNo
Dev. TRIP
External binary output signal with function number FNo
2Q
2II

)81&7,21
Parameter address
Parameter name
Parameter states
Example of a parameter switch )81&7,21 with the address 
(binary input, input annunciation)
(device annunciation)
FNo
FNo
Disclaimer of liability
Although we have carefully checked the contents of this
publication for conformity withthe hardware and software
described, we cannot guarantee complete conformity
since errors cannot be excluded.
The information provided in this manual is checked at
regular intervals and any corrections which might be-
come necessary are included in the next releases. Any
suggestions for improvement are welcome.
The contents of this manual is subject to change without
prior notice. Release 3.10.01
Copyright
Copyright  Siemens AG 2001 All Rights Reserved
This document shall not be transmitted or reproduced, nor shall its contents
be exploited or disclosed to third persons without prior written consent from
Siemens. Infringements shall entitle to damage claims. All rights reserved,
in particular in case of a patent grant or utility model registration.
Registered Trademarks
SIPROTEC, SINAUT, SICAM und DIGSI are registered trademarks of
SIEMENS AG. All other product and brand names in this manual may be
trademarks, the use of which by third persons for their purposes may in-
fringe the rights of their respective owners.

Preface
iv 7SS60 Manual
E50417-G1176-C132-A2

v7SS60 Manual
E50417-G1176-C132-A2
Contents
1 Introduction....................................................................................................................................... 1-1
1.1 Overall function ...................................................................................................................1-2
1.2 Application scope ................................................................................................................1-6
1.3 Features ..............................................................................................................................1-8
2 Design and Connection System...................................................................................................... 2-1
2.1 7SS601 measuring system..................................................................................................2-2
2.2 Peripheral modules..............................................................................................................2-4
3 Getting Started.................................................................................................................................. 3-1
3.1 Unpacking and repacking of devices and modules............................................................. 3-2
3.2 Incoming inspection of devices and modules...................................................................... 3-3
3.2.1 Check of the rated data....................................................................................................... 3-3
3.2.2 Electrical check.................................................................................................................... 3-3
3.3 User interface...................................................................................................................... 3-5
3.3.1 Operation from the user interface of the 7SS601 measuring system..................................3-5
3.3.2 Operation from a PC............................................................................................................ 3-6
3.3.3 Operating prerequisites....................................................................................................... 3-7
3.4 Storage................................................................................................................................ 3-8
4 Configuration .................................................................................................................................... 4-1
4.1 Designing a system configuration........................................................................................4-2
4.2 Configuration of the measuring system............................................................................... 4-4
4.2.1 Entering a password............................................................................................................ 4-4
4.2.2 Changing the operating language ....................................................................................... 4-5
4.2.2.1 Function description ............................................................................................................4-5
4.2.2.2 Hints on setting.................................................................................................................... 4-5
4.2.2.3 Overview of parameters ......................................................................................................4-5
4.2.3 Marshalling of binary inputs, binary outputs and LED indicators......................................... 4-5
4.2.3.1 Introduction.......................................................................................................................... 4-5
4.2.3.2 Marshalling of the binary inputs...........................................................................................4-8
4.2.3.3 Marshalling of the signal relays...........................................................................................4-9
4.2.3.4 Marshalling of the LED indicators......................................................................................4-11

Contents
vi 7SS60 Manual
E50417-G1176-C132-A2
4.2.3.5 Marshalling of the command (trip) relays...........................................................................4-12
4.2.4 Serial interface...................................................................................................................4-13
4.2.4.1 Function description...........................................................................................................4-13
4.2.4.2 Hints on setting..................................................................................................................4-13
4.2.4.3 Overview of parameters.....................................................................................................4-14
4.2.5 Setting of date and time.....................................................................................................4-15
4.2.5.1 Function description...........................................................................................................4-15
4.2.5.2 Hints on setting..................................................................................................................4-15
5 Functions...........................................................................................................................................5-1
5.1 Measurement method..........................................................................................................5-2
5.2 Formation of measuring currents from the transformer currents.........................................5-7
5.3 Power system and switchgear data - Block 01..................................................................5-14
5.3.1 Function description...........................................................................................................5-14
5.3.2 Hints on setting..................................................................................................................5-15
5.3.3 Overview of parameters.....................................................................................................5-15
5.3.4 Annunciations....................................................................................................................5-15
5.4 Busbar protection...............................................................................................................5-16
5.4.1 Function description...........................................................................................................5-16
5.4.2 Hints on setting..................................................................................................................5-18
5.4.3 Overview of parameters.....................................................................................................5-19
5.4.4 Annunciations....................................................................................................................5-19
5.5 Differential current supervision - Block 13.........................................................................5-20
5.5.1 Function description...........................................................................................................5-20
5.5.2 Hints on setting..................................................................................................................5-20
5.5.3 Overview of parameters.....................................................................................................5-21
5.5.4 Annunciations....................................................................................................................5-21
5.6 Fault recording - Block 74..................................................................................................5-22
5.6.1 Function description...........................................................................................................5-22
5.6.2 Hints on setting..................................................................................................................5-22
5.6.3 Overview of parameters.....................................................................................................5-22
6 Control in Operation.........................................................................................................................6-1
6.1 Read-out of information.......................................................................................................6-2
6.1.1 Output of annunciations and measured values ...................................................................6-2
6.2 Read out of the date and time .............................................................................................6-5
6.3 Testing the status of the binary inputs/outputs....................................................................6-6

Contents
vii
7SS60 Manual
E50417-G1176-C132-A2
7 Installation and Commissioning ..................................................................................................... 7-1
7.1 Installation and connection..................................................................................................7-2
7.1.1 Measuring system ...............................................................................................................7-2
7.1.2 Peripheral modules..............................................................................................................7-3
7.2 Commissioning.................................................................................................................... 7-5
7.2.1 Checking the connection circuit........................................................................................... 7-6
7.2.1.1 Infeed circuits of the protection............................................................................................ 7-6
7.2.2 Check of the complete protection system with operating currents...................................... 7-8
7.2.2.1 Directional check of the input currents ................................................................................ 7-8
8 Maintenance and Troubleshooting ................................................................................................. 8-1
8.1 General................................................................................................................................ 8-2
8.2 Routine checks.................................................................................................................... 8-3
8.2.1 7SS601 measuring system..................................................................................................8-3
8.2.2 Peripheral modules..............................................................................................................8-3
8.3 Troubleshooting...................................................................................................................8-4
8.3.1 7SS601 measuring system..................................................................................................8-4
8.3.2 Peripheral modules..............................................................................................................8-5
8.4 Repair/Return...................................................................................................................... 8-6
9 Technical Data .................................................................................................................................. 9-1
9.1 General data........................................................................................................................9-2
9.1.1 7SS601 measuring system..................................................................................................9-2
9.1.2 Peripheral modules..............................................................................................................9-5
9.1.2.1 7TM700 restraint/command output module......................................................................... 9-5
9.1.2.2 7TR710 isolator replica module/preferential treatment module ..........................................9-6
9.1.2.3 7TS720 command output module ....................................................................................... 9-7
9.1.3 Peripheral module housing..................................................................................................9-7
9.1.4 Matching transformers.........................................................................................................9-8
9.1.5 Summation current matching transformer........................................................................... 9-9
9.2 Electrical tests ...................................................................................................................9-10
9.3 Mechanical tests................................................................................................................9-12
9.4 Climatic stress test ............................................................................................................ 9-13
9.5 Service conditions ............................................................................................................. 9-14
9.6 Dimensions........................................................................................................................ 9-15

Contents
viii 7SS60 Manual
E50417-G1176-C132-A2
A Appendix........................................................................................................................................... A-1
A.1 Ordering data and accessories............................................................................................A-2
A.2 Block diagram - Measuring system......................................................................................A-5
A.3 Block diagrams - Peripheral modules..................................................................................A-6
A.4 Jumper settings for the measuring system..........................................................................A-9
A.5 Jumper settings for the peripheral modules.......................................................................A-11
A.6 Operating tree....................................................................................................................A-14
A.7 Overview of parameters ...................................................................................................A-19
A.8 List of information .............................................................................................................A-20

1-17SS60 Manual
E50417-G1176-C132-A2
Introduction 1
The SIPROTEC 7SS60 device is introduced in this chapter. An overview of the appli-
cation and characteristics of the 7SS60 is given.
1.1 Overall function 1-2
1.2 Application scope 1-6
1.3 Features 1-8

Introduction
1-2 7SS60 Manual
E50417-G1176-C132-A2
1.1 Overall function
Measuring
principle The main function of the 7SS60 protection system is a busbar protection that operates with the differential current measuring principle. The algorithm of the 7SS60 relies on
Kirchhoff’s current law, which states that in fault-free condition the vectorial sum ∆I
flowing into a closed busbar section must be zero. This summated current will be re-
ferred to in this chapter as differential current Id.
Restraint Some slight deviations from this law may be caused by current transformer errors, in-
accuracies in the matching of the transformation ratios and measuring inaccuracies.
Further errors, which may be due, for instance, to transformer saturation in case of
high-current external short-circuits, are counteracted by a load-dependent supple-
mentary restraint. From the load condition the restraint current IRis derived. This re-
straint current is formed as the summated magnitudes of all currents in the peripheral
module 7TM700.
Detection of
measured values The differential and the restraint current are fed into the 7SS601 measuring system. Insystemswithmultiplebusbarsorsectionalizedbusbars,eachselectivesectionuses
one 7SS601 measuring system (variant with summation current transformer) or three
measuring systems (phase-selective measurement). The correct allocation of the
feeder currents to the appropriate 7SS601 measuring system is ensured by the pe-
ripheral module 7TR710 (preferential treatment/isolator replica).
Pick-up
characteristic The characteristic can be set in the parameters for Id> (pick-up value) and for the k factor, which considers the linear and non-linear current transformer errors. The set-
ting for the pick-up value must be chosen according to the smallest fault current to be
expected. Differential currents above the set characteristic lead to tripping. The
threshold for the differential current supervision is set in the parameter ID thr.
Figure 1-1 Characteristic of the 7SS601 measuring system
Selective tripping,
isolator replica If a measuring system 7SS601 recognizes a tripping condition, the circuit breakers of the involved feeders must be tripped. This requires an isolator replica which is gener-
ated on the module 7TR710 (isolator replica/preferential treatment) from the position
of the isolators. Basing on this isolator replica a TRIP command of a measuring sys-
tem is distributed to the circuit breakers.
Id>
0
Differential current Id
Restraint current IR
ID thr
k = 0.80
k = 0,25
Pick-up
charact-
eristics
Tripping zone
Restraint
zone
Normal load line
.
.
.
.
.
.
.
.

Introduction
1-3
7SS60 Manual
E50417-G1176-C132-A2
Functional
components The 7SS60 digital busbar protection has two separate functional parts. One part is the 7SS601 measuring system. The measuring system detects and processes the mea-
sured values. It evaluates the restraint current IRand the differential current Idand
makes a tripping decision where required. The other part of the system, which will be
referred to as peripheral system, has the task of summating the feeder currents and
feeding the current sum into the measured value detection system. The current sum-
mation takes into account the switchgear status of the station.
If selective protection is desired for each phase, each phase is allocated its own mea-
suring system. Otherwise, the three phase currents are combined in a summation cur-
rent transformer, and the result processed. In that case only one measuring system is
required.
If a busbar is divided into two sections by a sectionalizing isolator or a bus coupler,
each section must have its own measuring system. Accordingly, six measuring sys-
tems are required for the phase-selective protection.
7SS601
measuring system The 7SS601 measuring system can detect one alternating current Idand one pulsat-
ing direct currentIR. The measuring inputs are galvanically isolated from the electronic
equipment by a current transformer or an optocoupler.
3 binary inputs are provided for the detection of external binary signals.
The system has 2 command relays with supervision. Command relay 1 consists of 2
relays connected in parallel. This relay cannot be marshalled; the function %37ULS
()1R) is permanently allocated to it. Command relay 2 is available for having
command functions marshalled to it. All command relays have a NO contact.
It has also 3 signal relays with changeover contacts, one of which is used for output
of the device blocked annunciation. The relay functionality (NC or NO)can be selected
by a jumper setting. The module is equipped with a serial RS485 interface. The con-
verter for the auxiliary power supply is integrated in the module.
Peripheral system Depending on the type and size of the systems that are to be protected by the 7SS60
busbar protection,differenttypesand numbers ofperipheralmodules areneeded.The
peripheral modules are installed in a 7XP204 housing; the number of housings re-
quired is determined by the number of modules used. Each 7XP204 housing can hold
up to 4 peripheral modules.
The following modules are available for the different functions:
•Restraint/command output module 7TM700
•Preferential treatment/isolator replica module 7TR710
•Command output module 7TS720
Restraint/command
output module
7TM700
This module comprises 5 units for the formation of restraint currents. It has also 5 in-
dependent TRIP command relays with 2 NO contacts each for multiplication of TRIP
commands generated by the 7SS601 measuring system.
The secondary current from the main current transformer of a feeder is normalized to
100 mA by a matching or summation current transformer and fed into the Idsumma-
tion path of the associated measuring system. The summation current Idis thus equiv-
alent to the vectorial addition of all feeder currents. Beside Id, the measuring system
requires a restraint value, which is formed by adding up the magnitudes of all currents.
The restraint units are used to form the current magnitudes. They rectify the feeder
currents and add them up in the IRsummation path.

Introduction
1-4 7SS60 Manual
E50417-G1176-C132-A2
Isolator replica
module/preferential
treatment module
This module can be used to implement 2 different functions which will be presented in
the following.
Isolator replica The isolator replica function detects the status of 2 isolators.
It allows e.g. to recognize the status of both isolators in a double busbar system. The
isolator status determines the allocation of the feeder currents to the appropriate mea-
suring system. It also ensures the stability and greatest possible selectivity of the pro-
tection system during dynamic processes such as switching operations.
Preferential
treatment If, during a changeover of a feeder in a double busbar system, both isolators of a feed- er are closed for a short time, no selective protection of the two busbars is possible.
The same is true for busbar sections that are connected by closing a sectionalizing
isolator. Whereas each of the two sections has so far been protected by its own mea-
suring system, the protection function is assumed by only one measuring system after
connecting the two sections. This is referred to as preferential treatment.
As several relays or modules may be involved in the switching action, there may be
an undefined allocation of the differential and restraint currents to the measuring sys-
tems during a few milliseconds caused by different relay switching times.
The blocking pulse required for system stability is generated automatically on the
module within the corresponding time.
Also an auxiliary relay is included with two changeover contacts.
Command output
module 7TS720 This module comprises 8 independent command relays with 2 NO contacts each for multiplication of the TRIP command generated by the 7SS601 measuring system.
It is necessary to multiply the TRIP command if the two NO contacts of the 7TR710
modules are not sufficient for command output to the circuit breakers. The measuring
system initiates the TRIP command first through a NO contact. In the simplest case,
an auxiliary voltage is fed directly from this contact onto the 7TS720 module, where it
causes one or more relay coils to pick up.
Transformers The differential current input Idof the 7SS60 is designed for 1 x In= 100 mA. There-
fore, a transformer must be provided between the 7SS60 and the main current trans-
former. In phase-selective protection systems, matching transformers are used; oth-
erwise there will be summation current transformers.
Figure 1-2 Principle diagram of transformers in the 7SS60 (one phase of a phase-selective protection system)

Introduction
1-5
7SS60 Manual
E50417-G1176-C132-A2
Wiring The 7SS60 busbar protection system is suited for a large variety of power systems,
from single busbar configurations without sectionalizing isolators to double busbars
with sectionalizing isolators and transversal couplers. The summation currents Idand
IRare distributed among the measuring systems by relay modules that provide for
connection of nearly all relay contacts to connecting points. This provides for a high
degree of flexibility of the modules. One configuration task is to design the wiring be-
tween the modules, the modules and the 7SS601 measuring systems, and to the pri-
mary equipment, in accordance with the desired function.
Mounting The 7SS60 busbar protection system is made up of individual components which are
then mounted station-specifically in cubicles or mounting panels.

Introduction
1-6 7SS60 Manual
E50417-G1176-C132-A2
1.2 Application scope
The 7SS60 busbar protection is an easily settable numerical differential current pro-
tection for busbars.
It is suitable for all voltage levels and can be adapted to a large variety of busbar con-
figurations. The components available are designed in particular for:
•11/2- circuit breaker systems
•single busbars (with/without sectionalizing isolators)
•double busbars with sectionalizing isolators, longitudinal couplers and transversal
couplers
These types of systems are shown in the following figures.
Single-phase measurement can be achieved by using external summation current
transformers. The use of matching transformers allows phase-selective measure-
ment.
For extra security, an additional measuring system (check zone) can be implemented.
The busbar protection system is designed to be the successor of the 7SS1 static bus-
bar protection. Where it replaces this system, the existing matching transformers and
summation current transformers can be used with the new system as well.
Figure 1-3 11/2- circuit breaker system
BB1
BB2

Introduction
1-7
7SS60 Manual
E50417-G1176-C132-A2
Figure 1-4 Single busbar with sectionalizing isolator
Figure 1-5 Double busbar with sectionalizing isolator and two transversal couplers
BB1A BB1B
BB1A
BB2A BB1B BB2B

Introduction
1-8 7SS60 Manual
E50417-G1176-C132-A2
1.3 Features
The 7SS60 busbar protection has the following features:
•Busbar protection operating on the differential current principle; one measuring sys-
tem per busbar section or, depending on the configuration, per phase and zone; op-
tionally one additional measuring system for the check zone (isolator-independent
measuring system)
•Full galvanic and interference-immune isolation between the internal processing
circuits and the measuring, control and supply circuits of the system by screened
measuring transducers, binary input and output modules and dc voltage converters
•Fully digital measured value processing and protection functions, from the sampling
and digitizing of the measured values to the TRIP decisions for the circuit breakers
•High degree of security against overfunction, and detection of external faults even
with unfavourable transformer configuration
•Differential current supervision of transformer circuits, with blocking option for TRIP
command
•Blocking of TRIP command possible by fast binary input
•Low demands on current transformers
•Numerical system with powerful 16-bit microprocessor system
•Easy menu-guided operation via integrated keypad and display panel or by con-
nected PC using DIGSI
•Storage of fault annunciations and of instantaneous values for fault recording
•Continuous monitoring of the hardware and software of the 7SS601 measuring sys-
tem, as well as of the primary current transformers and their supply conductors
•Integrated commissioning aids