NPUH800 & NPUH800R – Residual Overvoltage Relay (Neutral Displacement Relay)

Products family : Feeder Protection, Voltage Protection

Sector : Industry

NPUH800 & NPUH800R provide the zero-sequence voltage monitoring of three-phase networks with isolated or high impedance earthed neutral. These multi-function relays supervise phase to phase and phase to earth faults and the good operating of the circuit breaker and its trip circuits.

NPUH800R (R2 case) is dedicated to the refurbishment of 700 and 7000 of CEE relays (R2 case).
Two mountings are available, Flush Rear Connection (EDPAR) or Projecting Rear Connection (SDPAR). A blank cover R1, provide in option, can improve mechanical installation (replacement of CEE case R3 by a NPUH800R).

As well as the usual protection functions, NP800 relays provide monitoring, measurement and recording of the electrical quantities of the network.

Setting, reading, measurement and recording are all available locally or remotely.

ANSI codes
59N – Maximum of zero sequence voltage
74TC – Trip circuit supervision of the breaker
86 – Latching of the output contacts