Voltage protection relay PCS-915ID

currentIECdigital

Product overview
The PCS-915ID distributed busbar protection relay delivers low-impedance, sub-cycle busbar protection for multiple busbar schemes including single/double busbars, bus sections, transfer bus, breaker-and-a-half and ring-breaker arrangements. The system uses a distributed architecture: one Central Unit (CU) connected to up to 32 Bay Units (BUs) via optical point-to-point links. The CU handles protection calculations and relay coordination; each BU acquires analog and binary signals and executes trip/close commands from the CU.

Protection and control features

• Low-impedance busbar differential protection (87B)
• Phase current differential and percentage-restraint DPFC differential protection
• DPFC current differential with weighted CT saturation detection
• Voltage control element; CT saturation detection; check and discrimination zones
• Bus coupler/section protection
• Breaker failure (50BF), dead zone (50DZ), pole disagreement (62PD), switch-on-to-fault (50SOTF), overcurrent (50/51)
• Feeder protection functions

Monitoring and metering / General functional features

• Dynamic busbar replica
• CT and VT failure supervision
• Self-diagnostic functions
• Event recorder: 1024 change-of-binary-input events, 1024 supervision events, 1024 device logs
• Disturbance recorder: 32 disturbance records with waveforms (COMTRADE-compatible)
• Clock synchronization: IRIG-B, SNTP, PPS, PPM

Communication

• Up to 32 optical point-to-point ports (CU to BUs)
• Up to four 10Base-T/100Base-TX copper Ethernet ports (IEC 61850, DNP3.0, IEC 60870-5-103 over TCP/IP)
• Up to two 100Base-FX optical Ethernet ports (sharing two copper ports)
• Optional Sampling Value and GOOSE module with 32 optical Ethernet ports (IEC 61850-9-2 / IEC 61850-8-1 GOOSE)
• RS-485 serial ports for IEC 60870-5-103 and one RS-485 for clock sync; front RJ-45 for testing/setting

User interface

• Front HMI with large LCD and 9-button keypad
• Front RJ-45 port for commissioning and testing
• Rear RS-232 or RS-485 port for printer
• Language selection: English + selectable language

Characteristics / Technical specifications

• Architecture: Distributed Central Unit (CU) + Bay Units (BUs); CU links up to 32 BUs via optical fiber
• Protection principle: low-impedance differential with DPFC and weighted CT saturation detection
• Tripping performance: sub-cycle tripping for fast busbar clearing
• IEC compatibility: IEC 61850-8-1 (MMS/GOOSE), IEC 61850-9-2 (Sampling Value)
• Ethernet: up to four 10Base-T/100Base-TX copper ports; up to two 100Base-FX optical ports
• Optical communication: up to 32 optical point-to-point ports
• Serial ports: RS-485 for IEC 60870-5-103; RS-485 for clock sync; RS-232/RS-485 printer port
• Recorders: event recorder (1024 entries each); disturbance recorder (32 COMTRADE records)
• Clock sync: IRIG-B, SNTP, PPS, PPM
• Front panel: large LCD + 9-button keypad; front RJ-45 for testing/setting