Relay Verification; Preventive Parts Replacement; Measurements Verification - ABB REU 610 Operator's Manual

1MRS755971
5.2.1.
5.2.2.
5.3.
Voltage Relay
Operator's Manual - ANSI Version
When the plug-in unit is removed from the case, internals of the
case must not be touched. Relay case internals may have high
voltage potential and touching these may cause personal injury.

Relay verification

The relay maintenance verification contains:
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:
REU 610
51