NPRG860 & NPRG870 perform synchronization and paralleling of generators with electrical network.
NPRG860 features a speed adjustment function. NPRG870 adds a voltage adjustment function.
These two devices also include CB time compensation allowing paralleling without phase shift.

As well as the usual protection functions, NP800 relays provide monitoring, measurement and recording of the electrical quantities of the network. The relays can be set by the RS232 port, or remotely using the RS485 port. Reading, measurement and recording are all available locally or remotely.

CONTROL   AND   PROTECTION   FUNCTIONS

• Regulating device [90]
• Synchrocheck for manual paralleling [25]
• Anticipated closing time of the paralleling circuit breaker [TA]
• Dead Busbar paralleling
• Adjustment of the phase shift between GE and BB measurements (Step up transformer adaptation)
• Network configurable rated voltage

MAIN   FEATURES

• Configuration and parameter setting by local MMI or off-line / on-line PC
• Measurement of electrical quantities:
  – Phase voltages Uge, Ubusbar
  – Frequency Fge, Fbusbar
  – Voltage difference (Uge – Ubusbar)
  – Angular difference
  – Angular difference compensate (only NP.RG 870)
  – Frequency difference (Fge – Fbusbar)
  – Rate of frequency change dF/dt (Hz/s)
  – CB closing time (ms)
  – Phi anticipatory
• Self-diagnosis: Memories, output relays, A/D converters, auxiliary supply, cycles of execution of software, hardware failure
• Event recording: 250 locally recorded events, 200 saved in case of loss of auxiliary supply
• Disturbance recording according to Comtrade® format: storage of 4 recordings of 52 periods
• Optional Communication by Modbus® RS 485 or Ethernet by Modbus/TCP
• NPRG860-870:
  – ± speed order
  – Boost pulsing
• NPRG860:
  – 3+1 output units / 4 digital inputs
• NPRG870:
  – 7+1 output units / 8 digital inputs
  – ± U order
  – 4 setting groups for management of several selectable groups remotely by logical input