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PCS-921 Breaker Failure Relay
The PCS-921 numerical relay provides protection for circuit breakers, which includes breaker failure protection, pole discrepancy protection, dead zone protection, phase/ negative sequence overcurrent protection, earth-fault protection, overvoltage protection, undervoltage protection, frequency protection, single and/or three-pole auto-reclosing and synchronism check functions. The PCS-921 relay employs the programmable logic, configurable I/Os and definable 3-color LEDs to provide flexibility for specific applications. Frequency tracking is used to minimize the sampling error caused by system frequency fluctuation. The PCS-921 relay adopts the advanced multi-processor platform, providing the interfaces to station bus and process bus respectively and supporting IEC 61850-8-1 MMS, GOOSE and IEC 61850-9-2 Sampling Value. In addition, the RJ-45 faceplate port serves for testing and setting in effort to make commissioning and maintenance easier.
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Breaker failure protection (50BF)
Pole discrepancy protection (62PD)
Dead zone protection (50DZ)
Four stages of phase overcurrent protection (50/51P)
Four stages of neutral overcurrent protection (50/51G)
Four-stage negative sequence overcurrent protection (50/51Q)
Three-stage undervoltage protection and overvoltage protection (27/59)
One-stage negative sequence overvoltage protection (59Q)
Four-stage underfrequency protection and overfrequency protection (81)
Synchronism check (25)
Single and/or three-pole auto-reclosing (79)
Voltage and current drift auto adjustment
Frequency tracking
VT circuit supervision (VTS)
CT circuit supervision (CTS)
Self diagnostic
Event recorder including 1024 disturbance records, 1024 binary events, 1024 supervision events and 1024 operating logs
Disturbance recorder including 32 disturbance records with waveforms (The file format of disturbance recorder is compatible with international COMTRADE file.)
Clock synchronization using IRIG-B, SNTP, PPS (Pulse-Per- Second) and PPM (Pulse-Per-Minute)
Up to four 10Base-T/100Base-TX copper Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP
Up to two 100Base-FX optical Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP (Sharing two copper Ethernet ports)
Two RS-485 serial ports using IEC 60870-5-103
One RS-485 serial port for clock synchronization
Optional Sampling value and GOOSE communication module with six/eight optical Ethernet ports using IEC 61850- 9-2 and IEC 61850-8-1 GOOSE
HMI interface with large-size LCD and 9-button keypad on the front panel
One front RJ-45 port for testing and setting
One RS-232 or RS-485 rear port for printer
Language selection – English + selected language