Common abnormal voltage transformer

⑴ unbalanced three-phase voltage indication: a phase reduction (to zero), and the other two-phase normal line voltage is not normal, or accompanied by sound, light

signals, it may be high or low voltage power transformers fuse blown;
⑵ neutral non-effectively grounded system, three-phase voltage unbalance indication: a phase reduction (to zero), and the other two-phase increased (up to line

voltage) or pointer swings, may be single-phase ground fault or baseband resonance such as three-phase voltage also increased, and more than line voltage (refer to

Needle can be placed on the head), it may be divided or high frequency resonant;
⑶ high voltage fuse repeatedly blows, serious damage may be internal insulation, such as the interlayer or inter-turn winding short-circuit fault;
⑷ effectively earthed neutral system, the bus switching operation occurs when the phase voltage increases and low swing, usually a series resonant phenomenon; without

any operation, the sudden appearance of the phase voltage is abnormal increase or decrease, it may be transformer internal insulation damage, such as insulating

support

Stand around, sometimes winding layers TURN SHORT CIRCUIT;
⑸ neutral effectively grounded system, put into operation when voltage electric transformer voltage meter indicates instability, may be high voltage winding N (X) is grounded

poor contact.
(6) floating potential discharge, may be connected to the core through the core bolts and loose, causing the bolt in the floating potential; metallic foreign body in

the floating potential discharge; insulated bracket nut potential suspension;
(7) arc discharge, and can be discharged cascade winding on the core, the insulating supporting frame and the discharge poor; insulated water wet; ungrounded end of

the primary winding;
(8) Heat Fault