Relay stabilizer problem!!

I have a 4 k.v main line voltage stabilizer.
Brand= High-tech
When the input is 200/210v=> output 220/240v (silent/normal)
When the input is 130/140/150/160v=> OUTPUT 300v (noisy,loud)
Please tell me the reason behind it and what will be the cost to fix it.
I have already repaired this stabilizer for relay loop/ tak tak problem and then this over voltage problem is happening.please help ASAP

Swaraj008 said:

When the input is 130/140/150/160v=> OUTPUT 300v (noisy,loud)
Please tell me the reason behind it and what will be the cost to fix it

Click to expand...

Undervoltage protection circuit not working, it should shut down stabilizer instead of keeping it operating.

I repared it.but now a tak tak sound is coming from the stabilizer.its like a loop trying to stabilize the input and output voltages

The control board is bad. It should shut off the output when the input is outside the stabilization limit.

Swaraj008 said:

I have a 4 k.v main line voltage stabilizer.
Brand= High-tech
When the input is 200/210v=> output 220/240v (silent/normal)
When the input is 130/140/150/160v=> OUTPUT 300v (noisy,loud)
Please tell me the reason behind it and what will be the cost to fix it.
I have already repaired this stabilizer for relay loop/ tak tak problem and then this over voltage problem is happening.please help ASAP

Click to expand...

How good is your knowledge in electronic component??
Can You take picture of circuit board of your stabilizer(Top view) and post it here!!

I have a 4 k.v main line voltage stabilizer.
Brand= High-tech
When the input is 200/210v=> output 220/240v (silent/normal)
When the input is 130/140/150/160v=> OUTPUT 300v (noisy,loud)
Please tell me the reason behind it and what will be the cost to fix it.
I have already repaired this stabilizer for relay loop/ tak tak problem and then this over voltage problem is happening.please help ASAP

Click to expand...

You are asking for help posting insufficient information. It seems you are talking about a relay type automatic stabiliser. If so, try to furnish the transformer turns ratio of all taps, number of relays for AVR function, and the schematic of control circuit. For working out the turns ratio, you can apply a known input voltage to the outer tap (Starting and end terminal) and take note the voltages of all the taps. It will help to understand the turns ratio.