Voltage protection relay PCS-902S

thermalsynchronizationunder-frequency

Product overview
PCS-902S is a line distance relay that integrates primary and backup protection and comprehensive control functions for overhead lines, cables and hybrid transmission lines across multiple voltage levels. Designed for utility and industrial transmission applications, it delivers configurable protection schemes, synchrophasor measurement and extensive communications to support modern substation automation.

Protection and Control

• High-speed DPFC distance protection (21D)
• Six-zone phase-to-phase and six-zone phase-to-ground distance protection (21L)
• Pilot distance and pilot directional earth-fault protection (85)
• Power swing blocking/releasing logic (PSBR)
• Multi-stage phase and earth-fault overcurrent protection (67P/67G, 50/51)
• Negative-sequence overcurrent protection (67Q)
• Switch-on-to-fault (SOTF) and synchronism check (25)
• Auto-reclosing (79), breaker failure (50BF) and out-of-step (78) protection
• Thermal overload, under/overvoltage, frequency and ROCOF protection
• Stub differential (87STB), broken conductor (46BC) and pole discrepancy (62PD)
• Comprehensive switchgear control and voltage selection functions

Synchrophasor measurement

• GPS/IRIG‑B time synchronization and PPS support
• Synchronized phasors: Ua, Ub, Uc, U1, U2, U0, Ia, Ib, Ic, I1, I2, I0
• Analog measurements: P, Q, frequency and ROCOF (df/dt)
• IEEE C37.118 compliant phasor and analog measurement (P or M class selectable)
• Transmit synchrophasors to up to 4 PDC clients using TCP/UDP per IEEE C37.118
• Configurable binary status reporting (up to 32 points)

Measurement

• Current and voltage sampling at 2.4 kHz and 9.6 kHz
• Energy metering (active/reactive, import/export)
• Real, apparent and reactive power, power factor and frequency measurement
• Calibration of current, voltage and power channels

Recording

• Event recorder: 1024 disturbance records, 1024 binary events, 1024 supervision events, 256 control logs, 1024 device logs
• Waveform storage: 64 disturbance and 64 high-frequency COMTRADE-compatible records

Supervision

• VT and CT circuit supervision
• Trip/close coil and breaker supervision (travel time, interrupted current, trip counters, remaining life)
• Pilot channel and DC power supply monitoring
• Self-diagnostics and channel status statistics

Communication interface

• 2 or 4 x 100Base-TX copper Ethernet ports and 2 or 4 x 100Base-FX optical ports
• Extendable 1000Base-SX optical Ethernet for PRP/HSR
• RS-485 serial ports, front and rear RJ45 debug ports
• BNC, RS-485 or TTL ports for clock synchronization

Pilot channel scheme

• Optional single or dual fiber-optic pilot channels
• Support for G.703 and C37.94 interfaces

Communication protocol

• IEC 61850 (ed.1 & ed.2), IEC 60870-5-103
• DNP3.0, Modbus
• IEC 62439 PRP and HSR, IEEE 802.1w RSTP

Digital application (IEC 61850 / station and process level)

• IEC 61850 MMS server, GOOSE and IEC 61850-9-2LE SV
• Multiple 100Base-TX/FX and extendable 100Base-FX / 1000Base-SX ports for station/process levels

Clock synchronization

• IRIG-B via RS-485/TTL or BNC, PPS via serial/BNC/binary input
• IEEE 1588 (PTP) over Ethernet and SNTP (unicast & broadcast)
• Clock messages via IEC 60870-5-103, Modbus and DNP3.0

Cybersecurity

• Compliance with NERC CIP, IEC 62351, IEC 62443 and IEEE 1686

Technical specifications

• Model: PCS-902S
• Manufacturer / Brand: NR Electric Co., Ltd.
• Primary function: Line distance relay integrating primary and backup protection for overhead, cable and hybrid transmission lines
• Protection: distance (phase-to-phase and phase-to-ground), pilot schemes, over/under voltage, over/under frequency, ROCOF, overcurrent, earth-fault, breaker failure, auto-reclosing, out-of-step, etc.
• Synchrophasor: GPS/IRIG-B, P/M class selection, IEEE C37.118 compliance, phasors and analog outputs to up to 4 PDC clients
• Sampling rates: 2.4 kHz and 9.6 kHz
• Event/waveform storage: see Recording
• Communications: 100Base-TX/FX, extendable 1000Base-SX, RS-485, RJ45, BNC/TTL clock ports
• Protocols and standards: IEC 61850, IEC 60870-5-103, DNP3.0, Modbus, PRP, HSR, RSTP; cybersecurity standards as listed above