IPR-A Feeder Protection0 pages

IPR-A
Current
Monitoring & Protection

Protection for Feeders,
Generators & Industry

DESCRIPTION
The Current Protection Relay (IPR-A) has been designed to measure the line and ground RMS currents under
normal conditions or under disturbances. The current signals are sensed throughout current transformers (CT)
from each line. This information is internally processed by the microprocessor in order to take the current
protection actions defined under ANSI, IAC or IEC standard.

APPLICATIONS

FEATURES

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Primary and backup protection for utility feeder,
power plants and industrial distribution systems.
Protection of transformers, overhead lines, cables
and generators.
Allow the opening of the switch/disconnector within
the limits of its capacity, leaving the circuit
interruption fuses in the case of short circuit.

PROTECTION AND FUNCTIONALITY
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(50) Instantaneous overcurrent.
(50N/50G) Instantaneous ground overcurrent.
(51) Inverse time phase overcurrent
(51N/51G) Inverse time ground overcurrent
ANSI, IAC or IEC/BS142 curves included:
Moderately inverse.
Normal inverse.
Very inverse.
Extremely inverse.
Definite time.
*(46) Negative sequence timed overcurrent
*(79) Reclosing (2 shots)
Overload alarm pickup level.
Accumulated kA per phase on breaker interruption.

COMMUNICATION
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Remote communication using a PC or a PLC by 1
RS232 & 2 RS485 ports.
Remote programming of the setpoints.
Protocol used: Modbus RTU.

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CT primary ratio selectable in 5 A steps (10 A to
6000 A).
Line and ground RMS currents measurement.
1 trip relay and 2 programmable auxiliary relay.
Control power drop or internal fault relay.
Digital inputs: 1 breaker status & 3 programmable
Touchpad programming
Breaker operation & trip failure

SIGNALLING
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LED and LCD display indication.
Phase and ground current indication
Last trip cause and storage of values
Indication and storage of fault conditions and their
values.
Threshold LED for 50/50N, 51/51N.

ADDITIONAL FEATURES: (on request)
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3 Setpoints Group for Phase & Ground Protections
Autoreclose with 2 shoots
Cold load pickup control

APPLICABILITY
Systems:
Frequency
Voltage:

Mono phase and 3 or 4-wire threephase system
50 and 60 Hz
69 kV maximum

(*) IPR-A2 version only

Quality certified ISO 9001:2000

Protection relay
IPR-A_GBBR_180315