The SIPROTEC 7SD80 is a numerical line differential protection relay designed for selective protection of power cables and overhead lines up to 24 km, featuring a phase comparison algorithm for fast and stable operation. It offers redundant communication options, flexible protection functions, and interoperability with substation control systems via standard protocols like IEC 61850. The device also integrates monitoring capabilities, easy commissioning features, and various programmable inputs and outputs to enhance system availability and performance.

1. 7SD80 Cable
Differential Relay
SIPROTEC Compact

2.  The line differential protection SIPROTEC 7SD80 has been conceived for selective
line protection of power cables and overhead lines up to 24km for all kind of
starpoint configurations. The implemented phase comparison algorithm is a fast
and stable method for line protection in industry and distribution grids.
 The protection interface communication is carried out directly without external
equipment over copper wires, optical fibers or both in redundancy. The wide scope
of non directional and directional functions can be applied miscellaneously as
emergency functions as well as backup functions. For instance the 7SD80 enables
simplified and cost saving concepts for meshed grids and busbar protection by
means of reverse interlocking. Fast and selective tripping is guaranteed even if the
communication fails between the relays.
 The scope of functions includes protection functions as well as functions for
control and monitoring. The interoperable connectivity to substation control
systems is give by standard protocols like IEC61850. The general concept of
redundance for protection and its communication gets completed by Ethernet
redundancy protocols (PRP, HSR, RSTP) and thus increases the total system
availability. Integrated functions for commissioning help and easy settings lead to
short commissioning times.
Description

3. Detail
Protection interface communication
Data exchange of the differential protection function takes place by means of digital
communication via integrated two-wire interface and / or an integrated fi ber-optic
interface.
By parallel use of both options communication redundancy can be realised therefore.
Communication via the protection interface can further be used to send an
intertripping command to the circuit-breaker at the opposite end, and to exchange at
the same time up to 16 freely assignable binary signals between the 7SD80 relays.
Description

4.  Conformal coating available (NEW)
 Pluggable current and voltage terminals
 Binary input thresholds settable using DIGSI (3 stages)
 Secondary current transformer values (1 A / 5 A) settable using DIGSI
 9 programmable function keys
 6-line display
 Buffer battery exchangeable from the front
 USB front port
 2 additional communication ports
 Integrated switch for low-cost and redundant optical Ethernet rings
 Ethernet redundancy protocols RSTP, PRP and HSR for highest availability
 Relay-to-relay communication through Ethernet with IEC 61850 GOOSE
 Millisecond-accurate time synchronization through Ethernet with SNTP
 Short commissioning times by an easy parameterization and integrated
commissioning help for protection and communication
 Integrated interfaces for exchanging differential protection data (fi ber-optic up to
24 km/ 15 miles and/or two-wire copper cables up to 20 km/ 12 miles)
 Integrated monitoring function of the protection interface, both in the
commissioning phase and in running operation
 Addressability of the protection devices for the differential protection
communication in order to detect an accidental
Benefits

5.  Differential protection, line (87L)
 3 I0 differential protection ( 87N L)
 Ground-fault differential protection for systems with resonant or isolated neutral
( 87Ns L)
 Definite time-overcurrent protection with delay for phase ( 50 TD (3 stages))
 Definite time-overcurrent protection with delay for earth (50N TD (3 stages))
 Inverse time-overcurrent protection (phase) ( 51)
 Inverse time-overcurrent protection (ground) ( 51N)
 Inrush current detection
 Circuit-breaker failure protection (50BF)
 Trip-circuit supervision (74TC)
 Lockout (86)
 Circuit-breaker intertripping scheme (85 DT)
 External trip initiation
 Undervoltage/overvoltage protection (27/59)
 Underfrequency/overfrequency protection (81 U/O)
 Directional time-overcurrent protection (phase) (67 (3 stages))
 Directional time-overcurrent protection (ground) (67N (3 stages))
 Automatic reclosing (79)
 Flexible protection functions for current, voltage, power, cos?, frequency
 Thermal overload protection (49)
Protection functions

6.  Operational measured values V, I, f
 Energy metering valuesWp,Wq
 Circuit-breaker wear monitoring
 Minimum and maximum values
 Trip circuit supervision
 Fast measuring voltage failure “fuse-failure-monitor”
 8 oscillographic fault records
Monitoring Functions
Hardware
 4 current transformers
 0/3 voltage transformers
 3/5/7 binary inputs (thresholds configurable using software)
 5/8 binary outputs (2 changeover)
 1 live-status contact
 Pluggable current and voltage terminals
 Conformal coating available (NEW)

7.  Commands (e.g. for the control of circuit-breakers, disconnect switches, grounding
switches, etc.) through:
– keyboard
– binary inputs
– DIGSI 4
– communication interface
 User-defined PLC logic with CFC (e.g. interlocking)
Programmable Logic

8. Communication interfaces
 System/service interface
– IEC 61850 Edition 1 and 2
– IEC 60870-5-103
– MODBUS RTU
– DNP 3.0
– PROFIBUS-DP
– Ethernet redundancy protocols RSTP, PRP and HSR
 Service interface
– USB front interface for DIGSI 4
– RS232/RS485 (instead of the system interface)
 Protection interface
– Fiber-optic connection and/or
– Two-wire connection

9. The SIPROTEC 7SD80 is a numerical line differential protection relay, which in
addition to its main function, the selective protection of overhead lines and cables,
also covers control and monitoring tasks.
Applications

10. Connection Diagram

11. 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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