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Protection,Automation & Control
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Built upon decades' of research and development excellence with field proven application experience in power system. NR's intelligent PAC with ease of use and utility to make deployment, operation and maintenance of protection systems as smart, flexible and reliable as possible.
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Protection and Control
High-speed DPFC distance protection (21D)Six zone phase-to-phase distance protection (21L)Six zone phase-to-ground distance protection (21L)DPFC current differential protection (87L)Steady-state current differential protection (87L)Neutral current differential protection (87L)Pilot distance protection (85)Pilot directional earth-fault protection (85)Unique power swing blocking releasing logic (PSBR)Six stages phase overcurrent protection (67P, 50/51P)Six stages earth-fault protection (67G, 50/51G)Two stages negative-sequence overcurrent protection (67Q, 50/51Q…
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Synchrophasor measurement
Synchronize with the GPS time by IRIG-B time sourceCalculate synchronized phasors, including: Ua, Ub, Uc, U1, U2, U0, Ia, Ib, Ic, I1, I2, I0Calculate analog values, including: active power (P), reactive power (Q), frequency, ROCOF (df/dt)Transmit binary status of the IED to PDC (Phasor Data Concentrator) according to IEEE C37.118 standardRealize high accurate measurement of the phasors and analogs according to the IEEE C37.118.1-2011 and IEEE C37.118.1a-2014 standard.Communicate with PDC according to IEEE C37.118-2005 and IEEE…
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Measurement
Current and voltage measurement at a 2.4KHz sampling rateCurrent and voltage measurement at a 9.6KHz sampling rateTravelling wave current measurement at a 1MHz sampling rateEnergy metering (active and reactive energy are calculated in import respectively export direction)Power (Apparent/Real/Reactive)Power factorFrequencyCurrent, voltage and active/reactive power calibration
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Funcitons
Maintain the terminal voltage at a given value by adjusting the strength of the magnetic field when the generator loads changes.Reasonably distributing the reactive power between the generator units in parallel.Improve the stability of power system, including static stability, transient stability and dynamic stability.Do de-excitation to reduce the extent of the damage in case of internal fault of generator.Perform the maximum excitation limit and the minimum excitation limit for the generator according to operational requirements.
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Features
The Automatic Voltage Regulator (AVR) uses high-performance CPU as the core hardware, and adopts high precise multi-point AC sampling technology, and all the control, regulation, protection function are realized by the module designed software.Rectifier cabinet can withstand high capacity, with air wind cooling system.A lot of elements and protections are supplied for complete control function of excitation system.Parallel-connected dual-cabinet operational mode without switchover process has more reliability.Trending and recording data are provided. The user can record the da…
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System Configuration
NR’s excitation system consists of numerical excitation regulator, thyristor rectifier, diode valve rectifier, de-excitation equipment and auxiliary cabinets. According to the different requirements of each excitation mode, the above equipments can be flexibly tailored to combine the compatible solution.PCS-941X Digital Excitation Regulator It consists of dual-channel configuration or three-channel configuration. Each channel is an independent regulation unit based on advanced hardware platform, which is based on multi-processor system including PowerPC, DSP and FPGA. T…
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Features
Advanced and mature software platform: The power forecast system is based on NR Electric’s SOPHIC platform.The platform features such virtues as advanced architecture, mature and stable performance and has been applied to a series of national key projects.Advanced forecast algorithm: The physical model and ANN are used for power forecast to ensure forecast accuracy.The power forecast system is isolated from the public internet via reverse isolation device and substation monitoring system via firewall.
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DC Electronic CT
DC electronic CTs are intended for applications in HVDC converter stations. They measure DC current, harmonic current, and output digital signals for the protection and control devices in the converter station.Configuration The DC electronic CTs are composed of the following four parts: Primary SensorThe primary sensor includes one current divider and one air core coil. The current divider is used to measure DC current and the air core coil is used to measure harmonic current. Remote ModuleDC electronic CTs have multiple identical remote end modules, which can back…
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Recording Functions
Triggered recording Triggered according to the user defined or configured criteria for each channelVoltage and current variationVoltage and current over limitImbalance of phasesFrequency over limit and variationPower swingBinary input changeManual triggerRemote triggerContinuous recording24hrs uninterrupted recording with recording rate 1000Hz for 50Hz system and 1200Hz for 60Hz system. One file per minute up to 7 days.Long-term recording 24hrs uninterrupted recording RMS values with recording rate 1Hz. One file per hour over 3 months.Extract recording Automatically cho…
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Protection and Control
Automatic synchronizing (25A)Semi-automatic synchronizing (25SA)Manual synchronizing (25M)Multi-generator paralleling solution: capability of 10 circuit breakers’ synchronization. To any of the circuit breakers, frequency and voltage regulation can be done separately.Blocking signal to other equipmentReceive blocking signal from other equipment
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Monitoring and Metering
Dynamic busbar replicaCT failure supervisionVT failure supervisionSelf diagnosticEvent recorder including 1024 change-of-binary-input events, 1024 supervision events and 1024 device logsDisturbance recorder including 32 disturbance records with waveforms (The format is compatible with COMTRADE.)Clock synchronization using IRIG-B, SNTP, PPS (Pulse-Per- Second) and PPM (Pulse-Per-Minute)
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Protection and Control
Busbar current differential protection (87B)Phase current differential protectionDPFC differential protectionVoltage control elementCT saturation inhibitCheck zone and discrimination zoneBus coupler/section protectionBreaker failure protection (50BF)Dead zone protection (50DZ)Pole disagreement protection (62PD)Switch-onto-fault protection (50SOTF)Overcurrent protection (50/51)Feeder protectionBreaker failure protection (50BF)Dead zone protection (50DZ)Pole disagreement protection (62PD)Overcurrent protection (50/51)Voltage and current drift auto adjustmen…
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Protection and Control
Current differential protection (87S)The switchover of 3-terminal and 2-terminal current differential protection can be automatically implemented according to the open/close state of feeder disconnector.Two stage feeder end fault protection (50FLE)This protection is only valid when the feeder disconnector is opened. It is used to clear the faults between CT and the opened disconnector. It will send a transfer trip command to remote end and keep the local breakers in service.Sum overcurrent protection (50P)Phase overcurrent protection is based on the summed current of two CTs. …
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Monitoring and Measurement
CT circuit supervision (CTS)Self diagnostic.Auxiliary power supervisionEvent recorder including 1024 disturbance records, 1024 binary events, 1024 supervision events and 1024 operating logs.Disturbance recorder including 32 disturbance records with waveforms (The file format of disturbance recorder is compatible with international COMTRADE file.Clock synchronization using IRIG-B, SNTP, PPS (Pulse-Per- Second) and PPM (Pulse-Per-Minute)
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Communcation
Up to four 10Base-T/100Base-TX copper Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IPUp 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 60870-5-103One RS-485 serial port for clock synchronizationOptional 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 front panelOne front RJ-45 port for testing and settingOne RS-232 or RS-485 rear port for printerLanguage selection – English + selected languageAssistant software - PCS-Explorer
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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)Pilotdirectional 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)Thre…
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Monitoring and Measurement
Energy measurement (active and reactive energies for import and export)CT failure supervisionVT failure supervisionFault phase selectionFault Locator with parallel-line compensationSelf diagnosticEvent recorder including 1024 change-of-binary-input events, 1024 supervision events, 256 control logs and 1024 device logsDisturbance recorder including 32 disturbance records with waveforms (The format is compatible with COMTRADE.)Pilot communication channel supervisionSystem frequency supervisionClock synchronization using IRIG-B, SNTP, PPS (Pulse-Per- Second) …
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Communication
Optional single- or dual- pilot channels (fiber optic), complying with G.703 and C37.94Up to four 10Base-T/100Base-TX copper Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IPUp 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 60870-5-103One RS-485 serial port for clock synchronizationOptional Sampling value and GOOSE communication module with six optical Ethernet ports using IEC 61850-9-2 and I…
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User Interface
HMI interface with large-size LCD and 9-button keypad on the front panelOne front RJ-45 port for testing and settingOne RS-232 or RS-485 rear port for printerLanguage selection – English + selected languageAssistant software - PCS-Explorer
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