Commissioning Tests; Periodic Maintenance Tests - ABB RET670 Installation And Commissioning Manual

Section 15
Commissioning and maintenance of the fault clearing system
15.2
15.3
214
Protection IEDs shall be encapsulated according to environment requirements. In
tropical climates, cubicles are provided with glass-door and ventilation louvres.
Heaters for anti-condensation, often thermostatically controlled, are provided.
Cubicle power-loss is limited not to exceed protection IED temperature limits,
which is 55°C according to the IEC standard.

Commissioning tests

During commissioning all protection functions shall be verified with the setting
values used at each plant. The commissioning tests must include verification of all
circuits by green-lining the circuit diagrams and the configuration diagrams for the
used functions.
Further, the settings for protection functions are tested and recorded carefully as
outlined for the future periodic maintenance tests.
The final testing includes primary verification of all directional functions where
load currents is checked on the local HMI and in PCM600.. The amplitudes and
angles of all currents and voltages should be checked and the symmetry verified.
Directional functions have information about the measured direction and, for
example, measured impedance. These values must be checked and verified as
correct with the export or import of power available.
Finally, final trip tests must be performed. This involves activation of protection
functions or tripping outputs with the circuit breaker closed and the tripping of the
breaker verified. When several breakers are involved, each breaker must be
checked individually and it must be verified that the other involved breakers are
not tripped at the same time.

Periodic maintenance tests

The periodicity of all tests depends on several factors, for example the importance
of the installation, environment conditions, simple or complex equipment, static or
electromechanical IEDs, and so on.
The normal maintenance praxis of the user should be followed. However ABB
proposal is to test:
Every second to third year
• Visual inspection of all equipment.
• Removal of dust on ventilation louvres and IEDs if necessary.
• Periodic maintenance test for protection IEDs of object where no redundant
protections are provided.
1MRK 504 088-UEN C
Installation and commissioning manual