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 if tight and correct
- Check the wiring against the diagrams. Correct, if necessary
- Check the shunt I'e
1
ease, rep
1
ace defect ive coils • Check the
reason and eliminate any mechanical jamming
- Check, if necessi1"ryreplace, the contactors in the defective
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
i
tor and, if necessary, replace it.
Should a gas leakage be assumed, check all flange connections as
well as all pipe and soldered fittings with a leak detector, leak
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. .
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