A2 Protection Relays

A2 protection relays are compliant to Enel specifications responding to all the requirements related to the protection and control of the systems constituting a typical primary cabin. Each model is equipped with a set of analog/digital inputs and outputs capable of fulfilling the functions required by the specific application:

DV901: MV line protection and control relay
DV905: MV translation protection and control relay
DV907: MV bar cuts-out protection and control relay
DV910: MV power factor correction protection and control relay
DV913: Substation alerts command control relay
DV917: HV lines protection relay
DV920: HV transformer protection and control relay
DV922: HV neutral forming transformer protection and control relay
DV925: HV transformer protection and control relay
DV926: Monitoring relay for Petersen coil
DV928: Monitoring relay for isolated or compensated earthing systems
DV933: HV/MV transformer voltage regulation relay
DV945: HV lines control relay
DV966: HV/MV primary substation neutral management relay
DV971: Monitoring device for primary substation auxiliary services

Benefits

Different versions for different applications

Each model of A2 protection relay is designed to protect a specific asset.

Easy installation

The hardware architecture allows a quick wiring connection.

Intuitive interface

Simple and intuitive interface

Technical Specifications

GENERAL RATINGS

Supply voltage	110 Vdc ±20%
Power consumption	-*

VOLTAGE ANALOG CHANNELS

Voltage channels	Till 3*
Inputs voltage level	0 - 100 Vac / 0 - (100/√3) Vac
Operating frequency	47,5 - 52,5 Hz

CURRENT ANALOG CHANNELS

Current channels	Till 4*
Inputs current level	1 A / 5 A
Operating frequency	47,5 - 52,5 Hz

PROTECTION FUNCTIONS* (ANSI/IEEE)

50/51 (Overcurrent)

50N/51N (earth overcurrent)

67/67N (phase/earth directional)

59/59N (Overvoltage/ Neutral Overvoltage)

79 (auto reclosing)

25 (syncro-check)

50BF (Breaker failure)

2ndH REST (inrush current)

* According to the specific model