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6 Maintenance
6.1
General instructions
Before making any kind of maintenance operation it is compulsory to:
- De-energize the switchboard and put the modules that need maintenance in earth position
- Make sure that all the operations comply with safety standards and regulations for electrical
work.
- Before any access check that the three phases are earthed through a frontal window or by
using a safety voltage detector.
6.2
Maintenance program
During normal service the switchboards are almost maintenance-free. The frequency of ope-
rations and possible interventions are linked to the severity of service and to the ambient
conditions.
Below it is showed a maintenance program for a plant during its normal service in the ambient
humidity not more than 90% as an annual average and not more than 95% as a maximum
value. In harder ambient conditions, the program intervals should be more frequent.
Each year:
- Visually check the modules, equipment and auxiliaries.
- Make the normal operation inspections
Every three years:
- Measure the insulation resistance
- Clean all the isolating parts by means of a cloth and check the connections
- Clean and lubricate the electrical contacts of the load side earth switch.
- Clean and grease the mechanical kinematics of the load side earth switch
IMPORTANT:
The operating mechanisms of the switches and rotative switches do not need to be lubrica-
ted. In the normal service the modules do not need any particular maintenance. In case of
harder ambient conditions please consult SEL.
Summary of Contents for QMT Series
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Page 86: ...86 Notes ...
Page 87: ...87 ...