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by-pass pipe provided by our factory between the oil filling flange of the tap-changer head and the oil-
overflow flange of the transformer, so that the diverter switch oil compartment and the transformer can be
vacuumized simultaneously.
In order to meet the standart for oil filling of oil compartment and its conservator, use only transformer
insulating fluids in accordance with IEC 60296 for mineral oil, IEC 61099 for synthetic ester oil and IEC
62770 for natural ester oil. Both the on-load tap-changer and the transformer should be filled with new oil
under vacuum at the same time.
1) In order to vacuumize the tap changer and the transformer at the same time, connect a by-pass pipe
and the appropriate valves between pipe joints E2 and Q.
2) When filling oil, use the pipe joint S or Q on the tap-changer head.
3) Do not dismantle the flexible by-pass pipes before shutting the connected valves.
4) For a better and precised evaluation of insulating fluid , measure the breakdown voltage (as per IEC
60156) and water content (as per IEC 60814) at a sample of 20°C +-5 °C (as per IEC 60156) and
do not forget to record temperature of the sample.
5) Check breakdown voltage and water content values specified at table-13-2.
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After drying and without oil, continuing operation will cause damage to the on-
load tap-changer!
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After the transformer is dried, before operating the on-load tap-changer for the
first time, make sure that the tap selector is completely immersed in the
transformer oil and the diverter switch oil compartment is filled with oil.
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According to IEC60214-1, for SHZV type tap-changer, switching operation is
allowed for the diverter switch oil temperature range from -25°C to +105°C, and
it can be +115°C when overloaded.
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Do not step on the rupture disc when filling oil, and cannot directly fill oil from
the hole of the rupture disc.
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