L&T Electrical & Automation GIS GV3N, Руководство по эксплуатации и техническому обслуживанию

Страница: 27 / 56

Operation & Maintenance Manual 25
MAINTENANCE AND INSPECTION
GIS is designed to be maintenance-free, requiring only very
simple maintenance and inspection, lowering the running cost.
To keep the desired level of performance of the installed devices,
enable early detection of faulty parts and thereby forestall
possible troubles, it is recommended that the following check is
performed according to IEC 1208:
Inspection ~ to predict actual condition
Servicing ~ to preserve speci ed conditions
Repairs ~ to reestablish speci ed conditions
Maintenance servicing may only be performed by trained
specialists familiar with the peculiar characteristics of the
switchboard. It is recommended that E&A engineers be called in
to carry out some critical maintenance or repair works.
7.1 - Fundamental Philosophy of Maintenance and
Inspection
- The gas-sealed sections are continually monitored by the gas
monitoring device so it does not require a periodical overhaul
and inspection.
- It is recommended that an ordinary inspection centering on
operations. Check be performed one year after installation and
there after once every 2-4 years depending on operating and
local conditions.
- It is recommended that operation mechanisms for circuits
breakers and other devices be subjected to a detailed inspection
once every 6 years.
- When any abnormal conditions is detected or when a
speci ed number of operations is reached, an inspection should
be performed.
7.2 - Classi cation of Maintenance and Inspection
1) Routine Patrol Inspection
This inspection is performed externally while the panel is in
operation such as voltage and current readings and any
deviation from normal conditions. This inspection is part of the
routine patrol on the facility as a whole.
2) Periodically Inspection (Ordinary and Detailed)
This inspection is performed periodically at speci ed intervals to
keep the GIS and installed devices in good condition and at the
required level of performance.
- Ordinary inspection:
GIS operation is not interrupted and check is made mainly
external such as the effects of pollution or any other
environmental in uences.
- Detailed inspection:
GIS operation is interrupted and checked for protection and
control functions and operations of signaling devices and
interlock Mechanisms. Parts replacement is done according to
criteria.
3) Servicing.
Servicing is performed in the following cases:
- when an abnormal condition is found as a result of inspection
and
- when a speci ed number of operation is reached. Refer to
breaker and switch manuals for further detailed instructions.
Basic work on the panels should include but not limited to the
following:
- general cleaning of the panels. Clean off all contamination
and condensation when panels are installed in the tropics.
Remove any dust or dirt deposits, which can be lightly swept off
with a lint free cloth. Remove any sticky and greasy deposits on
insulators with a lint-free cloth dipped in an approved cleaning
agent.
- Procedure as in detailed inspection.
7.0 MAINTENANCE AND INSPECTION