PCS-902 Line Distance Relay

Introduction

• The PCS-902 offers comprehensive protection and control solutions for transmission lines with high-speed sub-cycle distance element. The PCS-902 is planned for application on overhead lines and underground cables with various voltage levels. These include series compensated, double- circuit, heavily loaded, feeble in feed (WI), short and long lines. It can meet the necessities of single-pole or three- pole tripping; it also provides single and/or three-pole auto- re-closing functions. The PCS-902(line distance relay) is appropriate for single and dual- breaker Uses Applications so long as optional dual CT inputs, dual breaker failure protections, and dual breaker auto-re-closing and dual synchronous-checks. Furthermore, the relay integrates the remote/ local control of circuit breaker, dis connector and earth switch.
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• The PCS-902(line distance Relay) works on wide range of advanced patented tools, such as DPFC (Deviation Power Frequency Component) distance protection and distinctive power swing blocking logic. Thus, confirming accurate and reliable Actions.
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• The PCS-902(line distance Relay) is attuned with IEC 61850 station bus and process bus applications. It supports IEC 61850-8-1 MMS, GOOSE and IEC 61850-9-2 Sampling Value. The RJ-45 face plate port is delivered for testing and setting, permitting for smoother commissioning and maintenance.

        Functions

Protection and Control

• Five zone phase-to-phase distance protection (21P)
• One zone phase-to-phase distance protection for pilot scheme (85)
• Five zone phase-to-ground distance protection (21G)
• One zone phase-to-ground distance protection for pilot scheme (85)
• High-speed DPFC distance protection (21D)
• Pilot directional earth-fault protection (85)
• Four stage phase overcurrent protection (50/51P)
• Four stage neutral overcurrent protection (50/51G)
• Three stages negative-sequence overcurrent protection (50/51Q)
• Breaker failure protection for one or two breakers (50BF)
• Stub overcurrent protection (87STB)
• Three stage under voltage protection and three stage overvoltage protection (27/59)
• Four stage under frequency protection and four stage over frequency protection (81)
• One stage negative-sequence overvoltage protection (59Q)
• Phase overcurrent protection during VT failure (50P VT)
• Neutral overcurrent protection during VT failure (50G VT)
• Switch-onto-fault (SOTF) logic
• Unique power swing blocking releasing logic (PSBR)
• Out-of-step protection (78)
• Broken conductor protection (46BC)
• Dead zone protection (50DZ)
• Thermal overload protection (49)
• Pole discrepancy protection (62PD)
• Reverse power protection (32R)
• Single and/or three-pole auto-reclosing (single-breaker or dual-breaker). (79)
• Remote/local control
• Synchronism check (25)
• Voltage and current drift auto adjustment.
• Frequency tracking.

Monitoring and Measurement

• Energy measurement (active and reactive energies for import and export)
• CT failure supervision
• VT failure supervision
• Fault phase selection
• Fault Locator with parallel-line compensation
• Self-diagnostic
• Event recorder including 1024 change-of-binary-input events, 1024 supervision events, 256 control logs and 1024 device logs
• Disturbance recorder including 32 disturbance records with waveforms (The format is compatible with COMTRADE.)
• Pilot communication channel supervision
• System frequency supervision
• Clock synchronization using IRIG-B, SNTP, PPS (Pulse-Per- Second) and PPM (Pulse-Per-Minute), IEEE 158

Communications

• Optional single- or dual- pilot channels (fiber optic), complying with G.703 and C37.94
• Having 4 (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 optical Ethernet ports using IEC 61850-9-2 and IEC 61850-8-1 GOOSE
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User Interface

• HMI interface with large-size LCD and 9-button keypad on the forward-facing(front) panel
• One front RJ-45 port for testing and setting
• Single(One) RS-232 or RS-485 rear port for printer
• Language selection – English + selected language
• Assistant software - PCS-Explorer

Features

• The sole (single) DPFC protection principle, firstly presented by NR Electric, Employs (pays) superimposed increscent quantities as protection criteria, which provides high speed fault approval and is immune to power swing and load fluctuation.
• A unique two-out-two logic is adopted in hardware design to improve security. Managing with the terminated scheme, this solution improves both security and dependability of protection system. The two self-governing/independent data acquisition tracks are provided to halt mal-operation caused by component failure. One works as a fault detector and the other is designed for protection logic. Tripping outputs are managed by both data acquisition paths.
• Self-adaptive moving threshold which only imitates nonconformity (Deviations) of power frequency components evolution the sensitivity and reliability throughout load fluctuation and system disturbance.
• The single power swing blocking logic can accurately supervise the distance protection throughout power swing, which confirms the distance protection will operate correctly for internal faults during power swing, and stops distance protection from mal-operation during power swing.
• Fast clearance of the faults within the protected zone is achieved by this relay. The typical operating time is less than 10 ms for close-up faults, less than 15ms for medium-zone faults and less than 25ms for remote-end faults.
• Comprehensive flexibility is attained via modular hardware design, scalable function library, programmable logics, configurable Inputs and Outputs (I/Os) and definable LEDs. It allows users to generate customized schemes for the definite projects. 2 fixed LEDs and 18 definable 3-color LEDs (Green/Yellow/Red) are provided.
• The relay is fully compatible with IEC 61850, including station bus communication and process bus communication. It provides up to 6 Ethernet ports for process bus with IEC 61850-9-2 Sampling Value and IEC 61850-8-1 GOOSE, as well as up to 4 Ethernet ports for station bus with IEC 61850- 8-1 MMS.
• Powerful disturbance recording role is integrated in the relay for post-fault analysis. Up to 64 disturbance records can be stored in non-volatile memory. Each and Every report comprises of 250-cycle (rotations) to 500-cycle (rotations) waveform records with 12-cycle pre- fault waveform.