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Before beginning
any fault clearances, disconnect the breaker from
the high voltage syst~m and earth it in accordance with the regula-
tions applicable.
Check the position of the closing spring
-
Measure the supply voltage
-
Disconnect the control circuits
-
Check the SF6 gas pressure
-
Check the termi na"1 connections
-
Check the wiring against the diagrams. Correct, if necessary
-
Check
the
shunt
reason and eliminate any mechanical jamming
-
Check,
if necessi1"ryreplace,
circuit
If the SF6 density monitor is defective, replace it
-
Switch on the supply voltage
In the event of an "~,F6 alarm" check the gas pressure and refill.
Check the dens ity mon
Should a gas
leakage be assumed, check all flange connections
well as all pipe and soldered fittings with a leak detector,
detection spray or SO:lp suds.
Renew faulty soldered connections, thighten leaking connections. In -
case of leaking flanges, disassembly of the respective pole column
may be necessary.
.,--
if tight and correct
I'e
ease,
rep
ace defect ive coil s • Check
1
1
the contactors
tor and, if necessary, replace it.
i
.
the
in the
defective
as
leak
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