Do you know why the rectifier diode is damaged?

Do you know why the rectifier diode is damaged?

The main damages of rectifier diodes are as follows:

1. Weak lightning protection and overvoltage protection measures.

The rectifier device is not equipped with lightning protection and overvoltage protection device, even if it is equipped with lightning protection and overvoltage protection device, but its work is not reliable and the rectifier diodee is damaged due to lightning strike or overvoltage.

two。. Poor operating conditions.

For the generator set with indirect transmission, because the calculation of the speed ratio is incorrect or the diameter ratio of the two belt discs does not meet the requirements of the speed ratio, the generator operates at high speed for a long time, and the rectifier diodee works at a higher voltage for a long time. Accelerate the aging of the rectifier diodee and be damaged prematurely.

3. Poor operation and management.

The operator on duty is irresponsible and does not understand the change of external load (especially between midnight and 6 am the next day), or when a load rejection fault occurs in the outside world, the operator fails to deal with it in time, causing overvoltage and breaking down the rectifier diodee.

4. The installation or manufacturing quality of the equipment is not up to standard.

Because the generator set is running in a large vibration for a long time, the rectifier diodee is also under the interference of the external force of this vibration; at the same time, because the rotational speed of the generator set is high and low, the working voltage of the rectifier diodee varies from high to low, which greatly accelerates the aging and damage of the rectifier diodee.

5. The specification and model of rectifier diodee are not in conformity with each other.

When replacing the new rectifier diodee, the pipe whose working parameters do not meet the requirements is replaced or the wiring is wrong, resulting in breakdown damage of the rectifier diodee.

6. The safety margin of rectifier diodee is too small.

The safety margin of overvoltage and overcurrent of the rectifier diodee is too small, so that the rectifier diodee can not bear the attack of the peak value of overvoltage or overcurrent transient process in the generator excitation circuit.