1, linked;
Cause: The AC contactor's remanence or oil contamination caused a delay in power loss, faulty sequence switching, or improper operation of the AC contactor.
2. The manual operation is normal, and the transformer on-load switch tester refuses to operate on-site electric operation;
Cause: No operation power supply or motor control circuit is faulty. For example, if the spring plate in the hand-operated mechanism is not returned, the latching switch contact is not connected.
3. During the electric operation, the air switch trips;
Cause: The cam switch set is displaced.
4, the electric mechanism can only tap change in one direction;
Reason: The limit mechanism has not been reset.
5, transformer on-load switch tester tap switch can not control the direction of operation;
Cause: Broken motor cable, poor contact, or capacitor failure.
6. The tap change of the motor mechanism in both positive and negative directions is refused;
Cause: No operation power supply or phase loss, hand lock switch contact did not return.
7, remote control refused to move, while the local electric operation is normal;
Cause: The remote control loop is faulty.
8. When the remote control and local electric or manual operation, the electric mechanism moves, the control circuit and the electric mechanism tap position indication are normally the same, and the voltmeter and the current meter have no corresponding changes;
Cause: The tap-change switch is not actuated, and the tap-changer is disconnected from the motor-drive mechanism. For example, the vertical or horizontal rotation linking pin is disengaged.
9, transformer on-load switch tester switch switch time extension or not switch;
Reason: The energy storage tension spring is fatigued, the tension is weakened, broken or mechanically stuck.
10. The tap position of tap changer and motor drive is inconsistent;
Cause: The tap changer and the motor-drive mechanism are not connected correctly.
11. The oil level of the oil conservator of the tap changer is abnormally raised or lowered until the oil level of the oil conservator of the transformer;
Reason: If the similar fault phenomenon continues to occur after the oil level of the oil conservator of the tap changer is adjusted, it should be judged as a defect in the seal of the oil chamber, which causes leakage of the oil in the oil chamber and the transformer body oil. Oil drain bolts in the oil chamber are not tightened and can also cause leakage of oil.
12. Chromatographic analysis of insulating oil in the transformer body has abnormal levels of hydrogen, acetylene, and total hydrocarbons;
Cause: Stop the tap-change operation and perform chromatographic tracking analysis on the insulating oil of the transformer body. If the dissolved gas component content and the gas production rate show a downward trend, it is judged that the insulating oil in the oil chamber leaks into the transformer body.
13, tap changer frequency signaling action during transformer on-load switch tester operation;
Cause: There is a partial discharge source in the oil chamber, causing continuous gas accumulation.
14, tap selector or selector switch static contact bracket bending deformation caused by transformer winding DC resistance exceeded, tap change refused to move or internal discharge;
Cause: The material of the tap selector or selector switch insulation bracket is not good, and the force and installation verticality of the tap lead do not meet the requirements.
Cause: The AC contactor's remanence or oil contamination caused a delay in power loss, faulty sequence switching, or improper operation of the AC contactor.
2. The manual operation is normal, and the transformer on-load switch tester refuses to operate on-site electric operation;
Cause: No operation power supply or motor control circuit is faulty. For example, if the spring plate in the hand-operated mechanism is not returned, the latching switch contact is not connected.
3. During the electric operation, the air switch trips;
Cause: The cam switch set is displaced.
4, the electric mechanism can only tap change in one direction;
Reason: The limit mechanism has not been reset.
5, transformer on-load switch tester tap switch can not control the direction of operation;
Cause: Broken motor cable, poor contact, or capacitor failure.
6. The tap change of the motor mechanism in both positive and negative directions is refused;
Cause: No operation power supply or phase loss, hand lock switch contact did not return.
7, remote control refused to move, while the local electric operation is normal;
Cause: The remote control loop is faulty.
8. When the remote control and local electric or manual operation, the electric mechanism moves, the control circuit and the electric mechanism tap position indication are normally the same, and the voltmeter and the current meter have no corresponding changes;
Cause: The tap-change switch is not actuated, and the tap-changer is disconnected from the motor-drive mechanism. For example, the vertical or horizontal rotation linking pin is disengaged.
9, transformer on-load switch tester switch switch time extension or not switch;
Reason: The energy storage tension spring is fatigued, the tension is weakened, broken or mechanically stuck.
10. The tap position of tap changer and motor drive is inconsistent;
Cause: The tap changer and the motor-drive mechanism are not connected correctly.
11. The oil level of the oil conservator of the tap changer is abnormally raised or lowered until the oil level of the oil conservator of the transformer;
Reason: If the similar fault phenomenon continues to occur after the oil level of the oil conservator of the tap changer is adjusted, it should be judged as a defect in the seal of the oil chamber, which causes leakage of the oil in the oil chamber and the transformer body oil. Oil drain bolts in the oil chamber are not tightened and can also cause leakage of oil.
12. Chromatographic analysis of insulating oil in the transformer body has abnormal levels of hydrogen, acetylene, and total hydrocarbons;
Cause: Stop the tap-change operation and perform chromatographic tracking analysis on the insulating oil of the transformer body. If the dissolved gas component content and the gas production rate show a downward trend, it is judged that the insulating oil in the oil chamber leaks into the transformer body.
13, tap changer frequency signaling action during transformer on-load switch tester operation;
Cause: There is a partial discharge source in the oil chamber, causing continuous gas accumulation.
14, tap selector or selector switch static contact bracket bending deformation caused by transformer winding DC resistance exceeded, tap change refused to move or internal discharge;
Cause: The material of the tap selector or selector switch insulation bracket is not good, and the force and installation verticality of the tap lead do not meet the requirements.
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