IPR-D Ground Fault0 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
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