NPU800 & NPU800R / NPU800RE – Voltage and Frequency Relay

Products family : Voltage Protection

Sector : Industry, Railway

NPU800 & NPU800R provide the voltage and frequency monitoring of electrical networks. These multi-function relays supervise phase to phase and phase to earth faults, positive, negative and zero sequence voltage and the good operating of the circuit breaker and its trip circuit. With its numerous under and over voltage and frequency thresholds, NPU800 & NPU800R are intended for network supervision, load management and load-shedding.

NPU800R (R2 case) and NPU800RE (R3 case) are dedicated to the refurbishment of 700 and 7000 series (R2 and R3 cases) of CEE.
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 NPU800R).

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
27 – Undervoltage
27P – Positive sequence undervoltage
47 – Maximum of negative sequence voltage
59 – Overvoltage
59N – Maximum of zero sequence voltage
74TC – Trip circuit supervision of the breaker
81 – Over and/or under frequency
86 – Latching of the output contacts