Preventive Parts Replacement - ABB REU 610 Operator's Manual

1MRS755770
5.2.2.
5.3.
5.4.
Voltage Protection Relay
Operator's Manual
1. Verifying measurements – can be performed according to the instructions in
Section 5.3. Measurements verification.
2. Verifying output contacts operation – can be performed according to the
instructions in Section 5.4. Function test.
The circuit breaker tripping circuit should be disconnected from the
relay during this verification, in order to avoid unwanted operation in
the system. Interlocking signals should also be disconnected from the
relay during the verification in order to avoid dangerous situations
from occurring in the system.
3. Verifying digital inputs operation – can be performed according to the
instructions in Section 5.5. Digital input test.

Preventive parts replacement

When being used for real-time clock and recorded data functions, the battery should
be changed every five years. Refer to Section 4.4.3. Inserting and changing the
battery.
Measurements verification
As most of the protection functions in the protection relay are based on the phase-to-
phase voltages and residual voltage measured by the relay, it is important to verify
that the relay is measuring proper values.
This measurements verification can be performed by examining the voltage readings
on the display while applying a pure sinusoidal voltage into the voltage input. If the
reading on the display corresponds to the calculated value, taking the relay accuracy
and display resolution into account, the relay is measuring proper values.
Rated voltage set for the energizing input that is being verified can be read via SPA
parameter V134 or via HMI.
When verifying phase-to-phase voltages or residual voltage measured by the relay,
the value to be shown on the display is calculated as follows:
Value on LCD (U )=
n
Function test
This section describes how the signal routing from protection functions to, and
operation of, the output contacts in the relay can be tested.

applied voltage

energizing input rated vo

REU 610 REU 610

(1)
 ×
U
n
l l tage

51