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Line Protection Device NSR-304

NSR-304, computer-based digital HV line protective device series, can serve as the main/backup protection of 110kV transmission lines.

NSR-304, computer-based digital HV line protective device series, can serve as the main/backup protection of 110kV transmission lines. When the longitudinal differential protection serves as the fast main protection, special fiber channel or multiplex one can be used as the longitudinal channel and the device supports 2048kbit/s E1 interface. When the longitudinal distance protection serves as the fast main protection, PLC or fiber channel can be used as the longitudinal channel.

  • Split phase current differential, zero-sequence current differential protection (NSR-304D)
  • Longitudinal distance, zero-sequence direction longitudinal protection (NSR-304Z)
  • 3-stage earthing fault, phase-to-phase distance protection
  • 4-stage definite time zero-sequence directional overcurrent protection
  • PT line-break phase overcurrent protection
  • Distance acceleration break, zero-sequence overcurrent acceleration break protection
  • Power swing blocking
  • Low-frequency protection
  • Auto-reclosing
  • Synchrocheck
  • CT line-break alarm
  • PT line-break alarm
  • TWJ abnormal alarm
  • Control circuit line-break alarm
  • Faulty phase, fault location
  • 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 multi timing modes: pulse per minute (1PPM), pulse per second (1PPS) and IRIG-B code timing
  • 3 Ethernet interfaces and supporting IEC 61850 or IEC 60870-5-103 protocols
  • 1 RS-232 communication serial interface for printer
  • 1 RS-485(EIA) differential bus interface for timing signal input
  • 1 Ethernet interface for computer-aided software for device testing and configuration
  • Action time of protection:
  • whole-line tripping time of longitudinal protection: <30mS
  • Stage I of distance protection: <30mS
  • Longitudinal protection
  • Longitudinal distance element, setting range: 0.1~25Ω(In=5A) 0.5~125Ω(In=1A)
  • Zero-sequence directional element, minimum action voltage: >0.5V; minimum action current: 0.1In
  • Distance protection
  • Setting range: 0.01~25Ω(In=5A) 0.05~125Ω(In=1A)
  • Setting value deviation of distance element: <5%
  • Accurate working voltage: <0.25V
  • Minimum accurate working current: 0.1In
  • Maximum accurate working current: 30In
  • Tripping time of Stage I, II and III: 0~10s

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