The 7SD610 relay is a differential protection relay suitable for all types of applications and incorporating all those functions required for differential protection of lines, cables and transformers. Transformers and compensation coils within the differential protection zone are protected by means of integrated functions, which were previously to be found only in transformer differential protection. It is also well-suited for complex applications such as series and parallel compensation of lines and cables.

1. SIEMENS SIPROTEC
7SD610 Universal Differential Protection Relay

2.  The 7SD610 relay is a differential protection relay suitable for all types of
applications and incorporating all those functions required for differential protection
of lines, cables and transformers.
 Transformers and compensation coils within the differential protection zone are
protected by means of integrated functions, which were previously to be found only
in transformer differential protection.
 It is also well-suited for complex applications such as series and parallel
compensation of lines and cables.
 It is designed to provide differential and directional back-up protection for all
voltage levels and types of networks.
 The relay features high speed and phase-selective short circuit measurement. The unit
is thus suitable for single-phase and three-phase fault clearance.
Description

3.  Digital data communication for differential current measurement is effected via
fiberoptic cables, networks or pilot wires connections, so that the line ends can be
quite far apart. The serial protection interface (R2R interface) of the relay can
flexibly be adapted to the requirements of all existing communication media.
 If the communication method is changed, flexible retrofitting of communication
modules to the existing configuration is possible.
 Apart from the main protection function, i.e. the differential protection, the 7SD610
has a full range of configurable emergency and / or back-up protection functions
such as phase and earth overcurrent protection with directional elements if voltage
transformers are connected.
 Overload, under and over-voltage/frequency and breaker failure protection round
off the functional scope of the 7SD610.
Description

4.  Differential protection for universal use with power lines and cables on all voltage
levels with phase-segregated measurement (87L)
 Two line ends capability
 Suitable for transformers in protected zone (87T)
 Restricted earth-fault protection (87N) if a transformer is within the protection zone
 Well-suited for serial compensated lines
 Two independent differential stages: one stage for sensitive measuring for high
resistance faults and one stage for high current faults and fast fault clearance
 Breaker-failure protection (50BF)
 Phase and earth overcurrent protection with directional element (50, 50N, 51, 51N,
67, 67N)
 Phase-selective intertripping (85)
 Overload protection (49)
 Over/undervoltage protection (59/27)
 Over/underfrequency protection (81O/U)
 Auto-reclosure single/three-pole (79)
Protection functions

5.  Self-supervision of the relay
 Trip circuit supervision (74TC)
 8 oscillographic fault records
 CT-secondary current supervision
 Event logging / fault logging
 Switching statistics
Monitoring functions
Control Functions
 Command inputs for control of CB and disconnectors (isolators)

6.  User-friendly local operation
 PC front port for convenient relay setting
 Function keys and 8 LEDs for local alarm
Front design
Features
 Browser-based commissioning tool
 Direct connection to digital communication networks

7.  1 serial protection data (R2R) interface
 Front interface for PC connection
 System interface
- IEC 61850 Ethernet
- IEC 60870-5-103 protocol
- PROFIBUS-DP, DNP 3.0 and MODBUS
 Service / modem interface (rear)
 Time synchronization via IRIG-B, DCF77 or system interface
Communication interfaces

8.  In addition to differential protection, the 7SD610 also incorporates a number of
additional functions:
− Three-stage overcurrent protection (can also be configured as backup or
emergency protection)
− Instantaneous high-current tripping, optionally with inter- rogation of the switchgear
status of all the line ends.
− Phase-selective breaker intertripping by means of the differential protection or of
an external protection unit.
− Single or three-pole autoreclosure using either conventional procedures or new
adaptive technology.
− Overload protection
− Genuine real-time mode for both units with synchronization via the communication
link.
Additional functions

9.  Connecting techniques and housing with many advan- tages
The 7SD610 is available in housing width of 1/3, referred to a 19” module frame system.
The height is 243 mm. All cables can be connected with or without cable ring lugs. Plug-in
terminals are available as an option, it is thus possible to employ prefabricated cable
harnesses. In the case of surface mounting on a panel, the connection terminals are located
above and below in the form of screw-type terminals. The communication interfaces are
located on the same sides of the housing. For dimensions please refer to “Dimension
drawings”
Construction

10. Communication modules

11. The 7SD610 relay employs flexible communication mod - ules. For the system interface a
820 nm fiber-optic module for connection to multimode fiber with two ST connectors is
available. Also available are electrical RS485 or RS232 interfaces for system and
modem/service interfaces.
The protection interfaces have the following options:
− 820 nm fiber-optic interface with clock recovery: 2 ST connectors for direct connection
with 2 62.5/ 125 µm multimode fibers up to 1.5 km or the connection to a communication
con - verter up to 1.5 km max.
− 820 nm fiber-optic interface: 2 ST connectors for direct connection up to 3.5 km with 2
62.5/125 µm multimode fibers.
− 1300 nm fiber-optic interface: 2 ST connectors for direct connection up to 10 km with 2
9/125 µm monomode fibers.
− 1300 nm fiber-optic interface 2 FC connectors for direct connections up to 35 km with 2
9/125 µm monomode fibers .
− Connection to a communica - tion network, the leased line or leased digital telephone line
is effected by means of special communication con - verters. These are fitted with a 820 nm
fiber-optic interface and two ST connectors on the protection unit side. Ei - ther an electrical
X21 inter - face or a G703.1 interface can be selected on the com - munications network
side. In addition, two communication converters are under devel - opment, which will allow
connection to leased lines or leased digital telephone lines via the S0 bus (available as of
05/2001).
Communication modules

12. Connection Diagram

13. Dimension Drawings

14. Mob No:
Mr. Piyush Rathi- +91-9819614841
Website:
www.reliservsolution.com
Email-ID:
piyush@reliserv.in
sales1@reliserv.in
Address:
Office No: 9, Space Heights,
Plot No. 53/54 , Sector 34,
Kamothe,Navi Mumbai- 410209
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