Ground Fault Protection Relay0 pages

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IPR-D

SYSTEM STATUS

IPR-D

Current

Monitoring & Protection

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.WW PROTECTION RELAY J

Ground Protection for Feeders,

Generators & Industry

DESCRIPTION

The Current Protection Relay (IPR-D) has been designed to measure the ground RMS current under normal

conditions or under disturbances. The current signals are sensed throughout a current transformer (CT). This

information is internally processed by the microprocessor in order to take the current protection actions defined

under ANSI, IAC or IEC standard.

APPLICATIONS

• Primary and backup ground protection for utility

feeders, power plants and industrial distribution

systems.

PROTECTION AND FUNCTIONALITY

• (50G/50N) Instantaneous ground overcurrent.

• (51G/51N) Inverse time ground overcurrent

• ANSI, IAC or IEC/BS142 curves included:

Moderately inverse.

Normal inverse.

Very inverse.

Extremely inverse.

Definite time.

• Overload alarm pickup level.

COMMUNICATION

• Remote communication using a PC or a PLC by 1

RS232 & 2 RS485 ports.

• Remote programming of the setpoints.

• Protocol used: Modbus RTU.

FEATURES

• CT primary ratio selectable in 5 A steps (5 A to

5000 A).

• Ground RMS current measurement.

• 1 trip relay and 3 programmable auxiliary relay.

• Control power drop or internal fault relay.

• Digital inputs: 1 breaker status & 3 programmable.

• Touchpad programming.

• Breaker operation & trip failure.

SIGNALLING

• LED and LCD display indication.

• Ground current indication.

• Last trip cause and storage of values.

• Indication and storage of fault conditions and their

values.

• Threshold LED for 50G/N, 51G/N.

APPLICABILITY

Systems: Mono phase, 3 or 4-wire three

phase system

Frequency 50 and 60 Hz

Protection relay

mQV Quality certified ISO 9001:2000 IPR-D_GBBR_040208