Relays for various Protection Application
General Information
- Description
Siemens offers all types of relays you need to design complete protection schemes. You can find relays here as autoreclosure or breaker failure protection, in addition to other relays.
Our Portfolio (3)
7SV600
Numerical Circuit-Breaker Failure Protection Relay
- Description
- Function overview
The SIPROTEC 7SV600 is a numerical relay used for circuit-breaker failure protection. A failure occurs when the circuit-breaker fails to correctly open and clear the fault after single or three-pole trip commands have been issued by the protection unit. It is then necessary to trip the relevant busbar zone (section) to ensure fault clearance.
Generally, the monitoring of the current is sufficent as the criteria for the indication that the circuit-breaker has successfully cleared the fault ("current condition"). However, under certain fault conditions, (e.g. overvoltage) little or no current may flow making the measurement of current unreliable for indication of the circuit-breaker status ("no current condition"). The 7SV600 will operate correctly for both these conditions. The relay is suitable for use at all voltage levels and in all applications. The current transformers can either be of the closed iron core or linear type. The relay can be incorporated in conventional switchgear systems and modem substation control systems e.g. SICAM.
Protection functions
- Circuit-breaker failure protection (single or three-pole with/without current)
- Independently settable delay times for operation with and without current
- Single or two-stage time delay of the busbar trip command
- Re-trip (cross trip) stage (1st stage of the 2-stage operation)
- Intertrip facility (via teleprotection interface)
- End-fault protection with intertrip
- “No current” control using the circuit-breaker auxiliary contacts
Features
- Highly sensitive current detection
- 2-out-of-4 check of the current detectors
- Short reset time, negligible overshoot time
- Can be initiated by phase-segregated or common-phase trip commands
- End-fault protection
- Assignable output relays, LEDs and binary inputs
Monitoring functions
- Monitoring of circuit-breaker auxiliary contacts
- Operational current measured values
- Self-supervision of the relay
- Event buffer
- Fault protocols
- Oscillographic fault recording
Communication interfaces
- 1 x RS485 interface
- IEC 60870-5-103 protocol
- DIGSI
Hardware
- Digital inputs: 3 binary inputs
- Digital outputs: 4 output relays
Front design
- Display for operation and measured values
- 6 LEDs for local alarm
