IG-183-EN version 06; 31/03/2020
77
General instructions
cgm
.3 system: medium voltage SF
6
gas-insulated
cubicles up to 38 kV according to IEEE and CSA standards
Maintenance
7. Maintenance
For safety reasons, maintenance operations performed
directly on the driving mechanism must be performed
WITHOUT any actuating lever inserted.
Do not refill the switchgear.
Switchgear is tested against SF
6
leakage for 30 years.
The live parts of the main circuit and switching equipment
do not require inspection or maintenance, as they are
completely insulated in SF
6
, and therefore free from any
influence from the external environment.
The driving mechanisms have also satisfactorily passed the
endurance tests (class M1/M2 for the switch-disconnector
and class M1 for the grounding switch, according to
IEEE C37.74).
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.
Components manufactured from galvanized sheet steel
have been painted to ensure their resistance to corrosion.
Any scratches, dents or similar on them must be repaired to
prevent corrosion.
In facilities that operate under severe climate
conditions with a greater demand than those
specified as Normal Service Conditions (IEC 62271-1,
IEEE
C37.74, IEEE
1247 and IEEE
C37.20.3), the
necessary regular preventive maintenance tasks must
be carried out. Consult
Ormazabal
in accordance with
the environmental conditions of the facility.
7.1. Voltage presence indicator test
To test the
ekor
.vpis /
ekor
.ivds voltage presence indicator,
connect it to a 110 V
ac
/ 230 V
ac
power supply. To do this,
disconnect the unit from the cubicle, and, using 0.16 inches
(4 mm) terminals, apply the voltage between the test point
for the phase to be checked and the ground test point.
No polarity is defined for 110 V
ac
/ 230 V
ac
voltage,
so either the phase or neutral conductor can be
connected.
If a flashing signal is observed, the device is working
correctly. In order to properly test the unit, this check should
be carried out for all three phases.
The voltage presence indication is not sufficient to
ensure that the installation has been disconnected
from the electricity supply. Before accessing the cable
compartments, it is necessary to confirm that the line
is grounded.
The
ekor
.vpis /
ekor
.ivds voltage detection unit can be
replaced if necessary. To do so, loosen until removing the
two screws on the top right and bottom left of the indicator
using a medium size Philips screwdriver. The unit can then
be disconnected from the base without needing to power
down the line.
Figure 7.1. ekor
.vpis
/
ekor
.ivds
unit device
