40
1MRS 755539
Feeder Protection Relay
Operator’s Manual - ANSI Version
REF 610
Relay commissioning includes:
1. Verifying that the correct application-specific settings have been entered into the
relay. This is done by reading the relay settings either via the HMI or serial
communication and comparing these to the calculated application-specific
settings. If read via serial communication, the settings can be stored as a
commissioning setting record file.
2. Verifying the current measurements – refer to section Measurements
verification
3. Testing of signal routing to output contacts – refer to section Function test
4. Testing of digital input signals availability – refer to section Digital input test
5. Testing of the optional arc detection - refer to section Arc detection test
6. Testing of short-circuit protection – refer to section Testing of protection
functions
7. Testing of ground-fault protection – refer to section Testing of protection
functions
4.2.
Maintenance instructions
When performing periodic preventive maintenance, the whole circuit breaker
tripping circuit should also be tested, if possible. This can easily be done with the
plug-in unit removed from the relay case, as the terminals for output contacts in the
relay case are left open in such a situation.
Relay preventive maintenance includes verification of the relay operation and
changing possibly worn parts. The verification is carried out to ensure that the relay
hardware operates correctly, i.e. as it did when first commissioned.
4.2.1.
Relay verification
The relay maintenance verification includes:
1. Verifying measurements – can be performed according to the instructions in
section Measurements verification.
2. Verifying output contacts operation – can be performed according to the
instructions in section Function test. The circuit breaker tripping circuit should
be disconnected from the relay during this verification, to avoid unwanted
operation in the system. Interlocking signals should also be disconnected from
the relay during the verification to avoid dangerous situations from occurring in
the system.
3. Verifying digital inputs operation – can be performed according to the
instructions in section Digital input test.
4. If there is a reason to believe that the optical fiber or the lens sensor for the arc
protection may have been damaged, for example due to heavy arcing inside the
switchgear cubicle, correct operation of the arc detection can be verified
according to the instructions in section Arc detection test.
Danger!
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.
!
