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What are the Possible Failures of Tap Switches?

 

 

What are the Possible Failures of Tap Switches?

1. No excitation tap switch failures
1) Insufficient contact spring pressure, uneven roller pressure to reduce the effective area, silver coating wear, contact with mud, resulting in poor contact switch, resulting in burns.
2) Poor contact of switch connection wire, resulting in burns when large current flows through.
3) The switch number error causes the three-phase voltage of the secondary side to be unbalanced, and the internal winding circulation is generated when the triangle connection is made, causing the transformer to overheat.
4) The distance between switches is not enough, resulting in short circuit between switches when overvoltage.

2. On-load tap switch failures
1) The current limiting impedance is burned off during the switching process. If the arc at the fracture cannot be extinguished, the fault will be enlarged.
2) The switch seal is not strict, resulting in flashover or short circuit after the water enters.
3) The switch roller is stuck, so that the contact stops in the transition position and is damaged.
4) The additional fuel tank of the switch is short of oil, which can not effectively extinguish the arc and is damaged.

What are the Possible Failures of Tap Switches?


1. No excitation tap switch failures

1) Insufficient contact spring pressure, uneven roller pressure to reduce the effective area, silver coating wear, contact with mud, resulting in poor contact switch, resulting in burns.

2) Poor contact of switch connection wire, resulting in burns when large current flows through.

3) The switch number error causes the three-phase voltage of the secondary side to be unbalanced, and the internal winding circulation is generated when the triangle connection is made, causing the transformer to overheat.

4) The distance between switches is not enough, resulting in short circuit between switches when overvoltage.


2. On-load tap switch failures

1) The current limiting impedance is burned off during the switching process. If the arc at the fracture cannot be extinguished, the fault will be enlarged.

2) The switch seal is not strict, resulting in flashover or short circuit after the water enters.

3) The switch roller is stuck, so that the contact stops in the transition position and is damaged.

4) The additional fuel tank of the switch is short of oil, which can not effectively extinguish the arc and is damaged.