LID VPD

Ultrasound Imager is based on Ultrasound Technology which pick Partial Discharge Ultrasound from a distance upto 100 meters and converts Ultrasound into visual video digital image. After leakage current measurement, Ultrasound Imager is used to scan the insulator strings of leaky tower and pinpoint the phase and position of the leaky insulator.

PROCEDURE

The Leakage current is measured in all four legs and summed to get the total Leakage Current. If the total Leakage Current is more than prescribed limit, the tower & insulator is declared to be leaky. Then the Ultrasound Imager discharge detector is used to scan every insulator string and pinpoint the leaky insulator string by identifying the Partial Discharge arcing in the insulator causing the leak. The graphical evidence of arcing is then recorded for future reference.

Electrical Arching, Tracking, Partial Discharge & Current Leakage

Overhead insulators provides mechanical support to high voltage cables and electrically isolate them from ground structure. In Contaminated condition, uneven resistance exist.The surface of contaminated insulator leads to formation of conductive layer causes leakage current to flow. As quoted from IEC 60270 PD does not cause immediate breakdown of the insulation, the appearance of PD indicates the presence of fault which cause energy dissipation and further leads to insulation degradation.

Advantages of leaky insulator detector test

Improved safety when testing with ultrasound: (LID-VPD) is designed to test Transmission/ Distribution towers, insulators and transformers for external arcing and corona type partial discharge and leakage current safely.

(LID-VPD) can also be used to test critical equipment from a safe area. You can improve your safety practices as well as locate potential points quickly. Find arcing, corona type partial discharge and leakage current:

You can indicate and locate the ultrasound produced Leakage Current by arcing and corona discharge easily using the Leaky Insulator Detector (LID-VPD). In many cases, ultrasound is produced before heat.

Therefore, you can implement an early cost effective routine monitoring program. Leakage Current is the most efficient technique to monitor and investigate the condition of insulator surface. Performs better:

The Leaky Insulator Detector (LID-VPD) have been tested on numerous occasions alongside competitive Technologies. The Leaky Insulator Detector (LID-VPD) detects with ultrasound technology and flexible clamp sensor with better accuracy than other devices.

Improves power transmission testing: You can increase the amount of electricity that reaches your customers and decrease power grid failure by using the Leaky Insulator Detector to routinely monitor power transmission / distribution lines and transformers.