Current protection relay PCS-915IC

IECdifferential

Overview
The PCS-915IC centralized busbar relay delivers comprehensive protection for multiple busbar topologies across all voltage levels. Supported arrangements include single busbar (with/without section), double busbar (with/without section), double busbar with transfer bus, breaker-and-a-half and ring-breaker configurations. Flexible topology configuration and extensive CT input and I/O capability enable protection of up to 25 feeders and simplify adaptation to site-specific schemes.

Performance and protection
The PCS-915IC provides fast, secure low-impedance busbar differential protection with sub-cycle tripping. The relay includes check-zone and discrimination-zone features to minimize the outage area. Advanced measures such as weighted CT saturation detection and DPFC current differential algorithms improve sensitivity and security. The device supports IEC 61850 station and process bus (IEC 61850-8-1 MMS/GOOSE and IEC 61850-9-2 SV). A front RJ-45 test port facilitates commissioning and maintenance.

Protection and Control functions

• Busbar current differential protection (87B)
• Phase current differential protection
• DPFC differential protection
• Voltage control element
• CT saturation inhibit
• Check zone and discrimination zone
• Bus coupler / section protection
• Breaker failure protection (50BF)
• Dead zone protection (50DZ)
• Pole disagreement protection (62PD)
• Switch-onto-fault protection (50SOTF)
• Overcurrent protection (50/51)
• Feeder protection functions: breaker failure (50BF), dead zone (50DZ), pole disagreement (62PD), overcurrent (50/51)
• Voltage and current drift auto adjustment
• Frequency tracking

Monitoring and measurement

• Dynamic busbar replica
• Isolator contact discrepancy alarm
• CT failure supervision
• VT failure supervision
• Self diagnostic
• Event recorder including 1024 change-of-binary-input events, 1024 supervision events and 1024 device logs
• Disturbance recorder including 32 disturbance records with waveforms (COMTRADE compatible)
• Clock synchronization using IRIG-B, SNTP, PPS (Pulse-Per-Second) and PPM (Pulse-Per-Minute)

Communication

• Up to four 10Base-T/100Base-TX copper Ethernet ports supporting IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP
• Up to two 100Base-FX optical Ethernet ports supporting IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP (shareable with copper 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 32 optical Ethernet ports supporting IEC 61850-9-2 and IEC 61850-8-1 GOOSE

User interface

• HMI with large LCD and 9-button keypad on the front panel
• One front RJ-45 test/configuration port
• One RS-232 or RS-485 rear port for printer
• Language selection – English plus selected language
• Assistant software: PCS-Explorer

Technical specifications

• Model: PCS-915IC
• Protection type: Centralized busbar relay, low-impedance differential protection
• Supported busbar arrangements: single, double, transfer bus, breaker-and-a-half, ring-breaker
• Feeder capacity: up to 25 feeders
• Communication protocols: IEC 61850-8-1 MMS, GOOSE; IEC 61850-9-2 Sampling Value; DNP3.0; IEC 60870-5-103
• Ethernet ports: up to 4 x 10/100Base-TX copper, up to 2 x 100Base-FX optical (shareable)
• Optional: Sampling value and GOOSE module (32 optical Ethernet ports)
• Serial ports: RS-485 (communication), RS-485 for clock sync, RS-232/RS-485 for printer
• Event/disturbance recording: 1024 event logs, 32 disturbance records with waveform (COMTRADE)
• Clock sync: IRIG-B, SNTP, PPS, PPM
• Front interface: large LCD, 9-button keypad, front RJ-45 test port