POSITIONING OF ANTENNA TO LOCATE PD IN POWER TRANSFORMER

Partial discharge (PD) online monitoring is an effective tool of examining the conditions of insulation and detecting faults in power transformers. From literature it is acknowledged that, the PD detection is not adequate to take a decision about intervening, so the location of fault is necessary to evaluate the hazard to corrective actions. The aim of this experiment is to determine the location of antenna to obtain the strong PD signal. The method used is an experimental work in the laboratory. A sample of two antenna model is made, one antenna is considered as a PD source (transmitting antenna) and other is used as a receiver. The height of transmitting antenna is kept at 25cm. Measurements have been taken by changing the distance between antennas from 15cm and 30cm and also varying height of receiving antenna from 3cm to 45cm. After analyzing the results, it is found that the strong signal has been received when receiving antenna’s height is same as transmitting antenna. Otherwise receiving antenna catches weak signal if the height of receiving antenna is lower or higher than 25cm. It means that the receiving antenna only received strong signal when both antennas are face to face with each other. It is concluded that many antennas must be used for locating the PD source. So that PD location can easily be found and can perform necessary actions on it.