IG-049-EN version 02; 02/10/2017
22
Maintenance
General Instructions
ormaset
Kiosk-type prefabricated transformer substation
11. Maintenance
The prefabricated enclosure does not require any
maintenance. Depending on the circumstances, the lock
may need looking at and greasing. Check the maintenance
guidelines for the medium voltage switchgear units, the
low voltage switchgear and the distribution transformer in
the accompanying General Instructions documents.
11.1. Medium voltage switchgear
The live parts of the main circuit and switching equipment
of the medium voltage switchgear do not require inspection
or maintenance, as they are completely insulated in SF
6
, and
therefore unaffected by the external environment. Class E2
electrical endurance tests guarantee there is no restriction
on maintenance of the breaking components.
The switchgear's driving mechanism used for each of the
medium voltage functions does not require greasing for
correct operation, according to the service conditions
specified in IEC 62271-1, throughout its estimated lifetime.
These mechanisms must be inspected when used under
extreme conditions (dust, salt, pollution). It is advisable to
carry out at least one operation during the inspections.
Whenever the painted metallic components have scratches,
bangs or similar damage, they must be repaired in order to
prevent corrosion.
11.2. Replacing the switchgear
Follow the safety procedures at all times, in keeping
with legislation and regulations on safety.
Carry out the following procedures to replace the electrical
equipment inside
ormaset
:
1.
Power down the medium voltage power supply to the
ormaset
transformer substation. Follow the power
removal procedure indicated by the electric utility
company.
2.
Open the doors to access the medium voltage and low
voltage area
Figure 11.8.
Detail of opening of doors to access the medium and low
voltage areas.
3.
Disconnect the earth connection braided cable that
connects the steel fixing of the enclosure body to the
ormaset
roof located on the top part of the medium
voltage access doors, using a 13 mm spanner.
Tool:
13-mm spanner.
Figure 11.9.
Detail of disconnection of the earth connection braided cable
Summary of Contents for Ormazabal ormaset
Page 27: ......
