Service; General; Secondary Testing - ABB REJ 527 Operator's Manual

REJ 527
5.
5.1.
5.2.
26
Directional or Non-Directional Earth-Fault Relay
Operator's Manual

Service

General

When the protection relay is operating under conditions specified (refer to Technical
Reference Manual, sections "Requirements" and "Technical data"), the relay is
practically maintenance-free. The relay includes no parts or components subject to
abnormal physical or electrical wear under normal operating conditions.
If the environmental conditions at the relay operating site differ from those
specified, as to temperature, humidity, or if the atmosphere around the relay contains
chemically active gases or dust, the relay ought to be visually inspected. At the
visual inspection shall be noted:
• Signs of mechanical damage on relay, contacts and relay case.
• Rust spots or signs of corrosion on terminals or case.
If the relay fails in operation or if the operating values differ remarkably from those
of the relay specifications, the relay is to be given a proper overhaul. All major
measures involving overhaul of electronics are to be taken by the manufacturer.
Please contact the manufacturer or the nearest representative for further information
about checking, overhaul and recalibration of the relay.
When contacting ABB for ordering service, please state the possible fault code.
Note!
Static protection relays are measuring instruments that should be handled with care
and protected against moisture and mechanical stress, especially during transport.

Secondary testing

According to the manufacturer's recommendations the relay should be submitted to
secondary testing at five years' intervals to ensure proper operation. Testing should
always be performed in accordance with national regulations and instructions.
When auxiliary voltage is connected to the protection relay, the relay performs a
self-testing program, which does not include the matching transformers and the
output contacts. The operational condition of the relay is tested by means of ordinary
relay test equipment and such a test also includes the matching transformers, the
output contacts and the accuracy of the operate values.
The secondary testing described in this manual is based on the relay's setting values
during normal operation. (If necessary, the secondary testing can be extended by
testing the protection stages throughout their setting ranges.)
All setting values that are altered during the test procedure have to be read and stored
prior to the tests so that they can be restored after the tests.
To enable secondary testing, the relay has to be disconnected, either through
disconnectable terminal blocks or a test plug fitted on the relay. According to the
disconnecting method used, the test plug has to be removed or the terminal blocks
connected after the tests.
1MRS 751055-MUM