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DESCRIPTION
The Current
Protection Relay (IPR-D) has been designed to measure the ground RMS currents under normal conditions or under
disturbances. The current signals are sensed throughout
current transformer (CT). This information is
internally processed by the microprocessor, to take the
current protection actions defined under ANSI, IAC or IEC
standard. The different functions provided by the IPR-D may be
classified into the following groups:
Applications:
- Primary and backup protection
for power plants, utility and industrial distribution
systems.
- Protection of transformers,
overhead lines, cables and generators.
Protection:
- CT primary ratio selectable in
5 amp steps (10 A to 5000 A).
- Inverse time ground overcurrent (ANSI
51N/51G), with selection of curves according to ANSI, IAC or
IEC/BS142, as follows:
Moderately inverse.
Standard inverse.
Very inverse.
Extremely inverse.
Definite time.
- Instantaneous ground
overcurrent (ANSI 50N/50G).
- Overload alarm adjustment to
one level.
- 1 trip relay and 1 alarm
relay.
- Loss of control volts relay.
Digital
Measurement:
- RMS ground currents.
- Maximum instantaneous
ground currents.
Signaling and
Programming:
- LED and LCD display
indication.
- Touchpad programming.
- Indication and storage of
fault conditions and their values.
- Ground pickup indicator for testing.
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