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EHV Line Protective Device NSR-303

NSR-303, compute-based digital EHV line protective device series, can serve as the main/backup protection of 220kV and above transmission lines. It accords with Q/GDW 161-2007 Line Protective and Auxiliary Device Standard Design Code. The protective longitudinal channel can be simplex or double-circuit fiber channel and each channel can be exclusive fiber channel or multiple channels. The device supports 2048kbit/s E1 interface. The device supports both traditional and electronic transformer sampling as well as the combination of them on both sides of the line. For electronic transformer sampling, the digital quantity of AC current/voltage is directly connected to the protective device via the merging unit (MU). The digital input interfaces are subject to the protocols defined in IEC60044-8 or IEC61850-9-2 with the quantity meeting the demand to direct connection with several MUs. The device tipping/closing commands and other signals can be output in traditional cabling modes or in GOOSE.

 

  • Hardware design platform of high performance, modular design of CPU (central processing unit) and DSP (digital signal processor): The device is provided with main start element and protection start element. The positive power of the output relay can be released only after the main start element acts so that damage of any element cannot result in unwanted action of the protection;
  • The flexibly combined device plugin configuration can meet the different requirements of the electronic transformer input, conventional transformer input, GOOSE input/output and the conventional hard contact output.
  • High-speed 24-point sampling, real-time parallel computation: The device can perform all the protection logic measurement and computation as well as real-time sorting of fault reports and event records at each point;
  • Whole panel, fully enclosed enclosure, separation of weak/strong current: The associated anti-disturbance measures are taken during software design, significantly improving the immunity; and the EM radiation can meet the associated codes and standards;
  • Rapid action: line’s nearby fault tripping time <10ms, line’s middle fault tripping time <15ms, and line’s remote fault tripping time <25ms (including not channel delay)
  • Adapt to change of power source of the system automatically; the longitudinal protection can trip reliably under weak current with high security.
  • The measurement element reflecting power frequency change utilizes the floating threshold with the adaptive ability, which is in the strong prevention ability to avoid the system unbalance and interference. So the measurement element can achieve high speed while guaranting safety. There is no frequent startup because the startelement has a high sensitivity.
  • Segregated current differential protection (87)
  • Zero sequence current differential protection (87G)
  • Inconsistent protection (for NSR-303*P** device)
  • Power frequency variation distance protection(21D)
  • Three-stage interphase distance protection(21P)
  • Three-stage earthing distance protection(21G)
  • Two-stage timing zero-sequence direction(51G)
  • PT line-break phase overcurrent protection(51PVT)
  • PT line-break zero-sequence overcurrent protection(51GVT)
  • Distance acceleration and zero-sequence acceleration protection(SOFT)
  • Remote tripping protection
  • Self-check
  • DC system no power alarm
  • Hardware circuit on-line monitoring
  • SOE contains 1024 input position change reports, 1024 self-check reports and 256 operating reports
  • The disturbance records contain 64 faults reports and 64 fault oscillagraphic records (the format of oscillagraphic records is compliant with the internationally recognized COMTRADE files)
  • Support multiple timing modes: pulse per minute (1PPM), pulse per second (1PPS), IRIG-B code timing and IEC61588 timing.
  • Flexibly match Ethernet interface or RS-485 serial port. The Ethernet interface can be connected with optical fiber interface or RJ-45 electric interface.
  • 1 RS-232 communication serial interface for printer
  • 1 RS-485(EIA) differential bus interface for timing signal input
  • IRIG - B code clock interface can be connected with the optional fiber interface or electric interface
  • IEC61588 clock checking
  • Three optical fiber Ethernet interface supporting three process layer GOOSE. The interface number can be increased.
  • The SV fiber interface protocol can be matched with the IEC60044-8(in favor of the IEC 60044-8 standard message or the configurable IEC 60044-8 agreement frame format message in State Grid Q/GDW 441-2010 Intelligent Substation Relay Protection Technical Specifications) or IEC61850-9-2. The interface number can be increased.
  • 1 Ethernet interface for computer-aided software for device testing and configuration.

NSR-303, compute-based digital EHV line protective device series, can serve as the main/backup protection of 220kV and above transmission lines. It accords with Q/GDW 161-2007 Line Protective and Auxiliary Device Standard Design Code. The protective longitudinal channel can be simplex or double-circuit firber channel and each channel can be exclusive fiber channel or multiple channels. The device supports 2048kbit/s E1 interface.


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