Commissioning And Maintenance - ABB REU 610 Operator's Manual

1MRS755971
5.
Voltage Relay
Operator's Manual - ANSI Version

Commissioning and maintenance

The relay should be subject to regular tests and maintenance in
accordance with national regulations and instructions.
Prior to commissioning, the functionality of the application-specific relay
configuration and settings have to be tested.
During relay commissioning, the overvoltage and undervoltage protection
and residual voltage protection is to be tested by using secondary testing to
secure personal safety. Additionally, correct operation of input and output
signals to and from the relay should be verified.
The relay is a numerical protection relay with functionality implemented in
the relay software configuration. Software functionality does not change over
time and the relay performs extensive self-supervision during operation.
Therefore, it is not necessary to perform extensive relay testing during
periodic maintenance.
When the protection relay is operating under the specified conditions (refer to
the Technical Reference Manual), the manufacturer recommends preventive
maintenance to be performed every five years. This periodically performed
preventive maintenance is to be carried out to secure correct and safe
operation of the relay. When performing preventive maintenance, the correct
functionality of the relay is to be verified as well as the wiring circuitry to and
from the relay.
If the environmental conditions at the relay operating site differ
from those specified, for instance temperature and 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, the following should be observed:
Signs of mechanical damage on the relay, contacts and relay case.
*
Rust spots or signs of corrosion on the terminals or case.
*
Do not remove the plug-in unit from the relay case during any
phase of the testing when primary circuit is live. The high
voltage in secondary voltage transformer circuit may be lethal
and damage instruments and insulation.
REU 610
49