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Detection Technology

Troubleshooting of Insulation Resistance Tester

time:2020/12/5   source:华天电力  reading:566 time

Detection method: the unbalance rate of three-phase DC resistance greatly exceeds 4% or a certain phase is not connected at all,


Solution: Check the core by lifting the core to determine the fault location. If the contact is poor, you can re-grind and press it again. If the welding is poor, re-weld. If the welding surface is insufficient, you should increase it. If the lead cross section is insufficient, replace (enlarge). Meet the demand.


2. The tap switch failure of the insulation resistance tester of the internal water cooling generator


Detection method: Measure the DC resistance of different taps. If it is completely blocked, it means that the switch is burned; if the direct resistance of a tap is unbalanced, it means that the contacts are individually burned; if the burnt smell is heavy, it means overheating or arcing.


Handling method: Check by lifting the core. If the switch contacts only have overheating, poor contact or slight arcing, they can be removed for maintenance and reused. If the burn is severe or the contacts are discharged to the ground, a new switch should be replaced. Discharge to the ground may generally cause the deformation of the turns of the voltage regulation section of the high voltage coil. In serious cases, the coil should be repaired or re-wound (replaced) the coil.


Insulation Resistance Tester (3).png

3. Coil failure of the insulation resistance tester of the internal water cooling generator


Detection method: In general, coil faults often occur with fuel injection in the oil conservator, swelling of the tank, and oily coke. The insulation resistance and DC resistance can be measured. The insulation resistance is "zero", and the increase in DC resistance is not stable.


Handling method: Check the core and determine the fault condition. If the damage is minor, it can be repaired and used. If the fault is serious, the coil should be replaced. Technical transformation should be carried out for the tight seal of the oil conservator.


Fourth, the insulation of the internal water cooling generator insulation resistance tester drops


Detection method: Regular transformer insulation resistance and oil test. If the measured value changes greatly or is lower than the requirements of the "Regulations", it can be determined that the transformer is damp or the oil insulation resistance decreases.


Treatment method: The insulation resistance of the transformer should be thoroughly dried, and the oil insulation can be replaced or filtered. The transformer should be repaired if the transformer is not tightly sealed and the moisture absorber failure.

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