Bay controller PCS-9705S

Product Overview
The PCS-9705S Bay Control Unit (BCU) is a general-purpose control, protection and automation device for substations, power plants and industrial applications. Its modular hardware design enables adaptation to customer requirements. Applicable to both conventional and digital substations, the PCS-9705S supports IEC 61850 Edition 1 and 2 and provides MMS/GOOSE/SV network interfaces. The process layer supports peer-to-peer and networking modes (single and dual network). The station layer exchanges MMS and GOOSE messages for interlocking and status signalling.

Protection Functions

• Six-stage phase overcurrent protection (50/51P)
• Six-stage earth-fault overcurrent protection (50/51G)
• Two-stage negative-sequence overcurrent protection (50/51Q)
• Undercurrent protection (37)
• Two-stage phase overvoltage protection (59P)
• Positive-sequence overvoltage protection (59Pos)
• Two-stage negative-sequence overvoltage protection (59Q)
• Two-stage residual overvoltage protection (59G)
• Two-stage phase undervoltage protection (27P)
• Six-stage overfrequency protection (81O)
• Six-stage underfrequency protection (81U)
• Six-stage rate-of-change of frequency protection (81R)
• Two-stage reverse power protection (32R)
• Breaker failure protection (50BF)
• Transfer trip (TT)
• Auto-reclosing (79)

Control Functions

• Switchgear control
• Double-point status synthesis
• Remote/local control mode switching
• Interlocking logic for control
• Direct control
• Closing synchronism check with selectable voltage source
• Switchgear trip counter
• Tap position indication and control
• Automatic voltage regulation (90V)
• Parallel voltage regulation (PVR)

Measurement and Metering

• Voltage (U), Current (I), Active Power (P), Reactive Power (Q), Power Factor (Cos)
• Positive, negative and zero sequence components
• Harmonics up to 15th order
• Energy metering (active/reactive, import and export)
• Power Quality Supervision (THD, deviation and unbalance)
• DC analogue inputs (0~±20mA or 0~±10V)
• DC analogue outputs (4~20mA, 0~10V, 0~5V or 0~20mA)

Monitoring

• CT circuit failure supervision (CTS)
• VT circuit failure supervision (VTS)
• Self-diagnostic functions
• Fault recording buffer up to 10,000 sampled points at 4.8 or 9.6 kHz
• Event recorder: 1024 change-of-state, 1024 supervision events, 256 control logs and 1024 device logs
• Disturbance recorder: 32 disturbance records with waveforms (COMTRADE-compatible)
• Single-line diagram display support

Communication

• Protocols: Modbus, DNP3, IEC 60870-5-103, IEC 61850 Edition 1 & 2, PRP (IEC 62439), HSR (IEC 62439), RSTP (IEEE 802.1w)
• Support for digital substation interfaces (MMS/GOOSE/9-2LE SV)
• Extendable communication interfaces
• IEC 61850 MMS server and IEC 61850-8-1 GOOSE support
• Up to four 10Base-T/100Base-TX copper Ethernet ports
• Up to four 100Base-FX optical Ethernet ports
• Two RS-485 serial ports (communication/printer)
• One RS-485/TTL serial port and one BNC connector for clock synchronization
• Front and rear RJ45 debugging ports

Technical specifications

• Model: PCS-9705S
• Type: Bay Control Unit (BCU) for protection, control and automation
• Applications: substations, power plants and industrial environments
• Modular hardware design for customer-specific configurations
• IEC 61850 support (Edition 1 & 2) for signal modelling and digital substation integration
• Network interfaces: MMS, GOOSE, SV; peer-to-peer and single/dual networking modes
• Comprehensive protection, control and measurement functions (see lists)
• Measurement capabilities: sequences, harmonics to 15th, energy metering (import/export)
• Analogue IO: DC inputs 0~±20mA or 0~±10V; DC outputs 4~20mA, 0~10V, 0~5V or 0~20mA
• Supervision: CT/VT circuit monitoring and self-diagnostics
• Event and disturbance recording (COMTRADE-compatible disturbance logs)
• Faults buffer: up to 10,000 sampled points at high sampling rates
• Supports multiple industrial communication protocols and digital substation architectures