What is the megger value of the 33KV oil transformer?

What is Megger?

The Megger is a tool used to measure the insulation’s resistance. It operates on the comparison principle, which compares the insulation’s resistance to a known value of the resistance. When the insulating resistance is low, the pointer on the moving coil indicates that there is no resistance; when it is high, the indicator deflects in direction of infinity. The Megger is a very accurate instrument in comparison to other measuring tools.

What is insulation resistance (IR) value?

The insulation resistance (IR) value of electrical equipment, which is frequently measured with a megger, may function as a useful indicator of the state of the equipment’s insulation.

What is the megger value of the 33KV oil transformer?

The specific rules and guidelines that are followed in industry will determine the minimum insulation resistance value that is suggested for the transformer with oil-filled insulation that operates at 33 kV.

The value of this suggested minimum insulation resistance can be found. However, a standard recommendation is to keep an insulating resistance (IR) value of the minimum of 1MΩ for every 1 kV of working voltage. This is a guideline that is regularly employed.

In a transformer with a voltage of 33 kV, the minimum IR-insulation resistance value that is required is generally about 33 MΩ. In addition, this value ensures that the insulation is in good condition.

It is essential to remain in consideration that the parameters listed above are merely recommendations, and that

  • Actual transformer designs,
  • Environmental conditions, &
  • Industry regulations

may all result in different values.

It is usually recommended to reference the manufacturer’s documentation (or) relevant standards when looking for specific suggestions regarding the testing of insulating resistance and permitted values for the particular transformer.