Capacitor bank protection

Reyrolle 7SR191
The 7SR191 Capa is a numerical protection relay with a highly comprehensive functional software package.
Features
The market for power capacitors is continually growing due to the expanding power network driven by increased customer demand. Power capacitors improve the performance, quality and efficiency of the system and minimize power loss. The Reyrolle 7SR191 Capa protection relay is designed with all of the necessary functionality for use on shunt connected distribution capacitor banks arranged in all of the common connection configurations:
Single star
Double star
Delta
H configuration
The Reyrolle 7SR191 Capa is a numerical protection device with a highly comprehensive functional software package which includes a range of integral application functions aimed at reducing installation, commissioning, wiring and engineering time.
User selectable hardware configuration to suit different bank arrangements
- 3 pole overcurrent + 1 pole unbalance
- 1 pole overcurrent + 3 pole unbalanceOptional voltage inputs
Re-energisation blocking to prevent CB closing until the bank has self discharged
Overvoltage protection by integration analysis of current
Suitable for use with both internally/externally fused and fuseless capacitors
User programmable characteristics for all inverse voltage, current and thermal curves
Unbalance protection with natural spill compensation
Functions
Protection functions
Fascia programmable
CB control via fascia, binary inputs and communication SCADA system
User definable logic both via Quicklogic equations and a graphical design tool
Multiple setting groups
Measured values
Fault records
Disturbance waveform records
Event records
6 User alarms for LCD text indications
Trip circuit supervision
Close circuit supervision
Virtual input/output
CB operation counts
Demand metering
Harmonic analysis and THD
Undercurrent/Loss of Supply (37)
Phase unbalance (46M)
Negative phase sequence overcurrent (46NPS)
Thermal overload (49)
Instantaneous overcurrent (50)
Instantaneous earth fault (50N)
Circuit breaker fail (50BF)
Time delayed overcurrent (51)
Time delayed derived earth fault (51N)
Overvoltage by current integration (59C)
Capacitor unbalance current (60C)
High impedance REF (87REF)
Under/overvoltage (27/59)
Negative phase sequence voltage (47)
Neutral voltage displacement (59N)
Directional instantaneous overcurrent (67/50)
Directional instantaneous rarth fault (67/50N)
Directional time delayed overcurrent (67/51)
Directional time delayed earth fault (67/51N)
Under/over frequency (81)