14
1ZSE 5492-129 en, Rev. 6
2.2 Pressure relay
WARNING
To take the transformer into service after a pressure relay trip without carrying out a
careful investigation of the diverter switch by lifting it out of the diverter switch hous-
ing, and repairing faults, if any, may cause severe damages to the on-load tap-chang-
er and the transformer.
Error condition Fault finding procedure
The pressure relay has tripped
during normal operation.
1. Examine the diverter switch according to section
3.5 ”Examination of the diverter switch after a pres-
sure relay trip” in this guide. Continue with steps 2
and 3 if no fault is found.
2. Carry out tests on the pressure relay according
to section 3.7 ”Tests of the pressure relay” in this
guide.
3. The on-load tap-changer is now ready for service.
Fig. 3. Pressure relay.
Information plate
Valve handle
Test tap (R 1/8’’)
TC_00264
Connection nut
2. Trouble-shooting
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