Avoid bad things happening to your transmission lines

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.


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.

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Functional Requirement : Leaky Insulator Detector with Video Partial Discharge measures Tower Leakage Current & Visually detect of Ultrasound Partial Discharge to identify the leaky insulators.

Memory : Instrument should have internal memory storage up to 8GB
72 sealed microphones (spiral array) for use in industrial areas
Real-time acoustic results at 100 fps for real time results
Wide frequency range : 10 Hz to 100 kHz for the detection of audible sound and ultrasound
Integrated data acquisition and analysis software
Handheld device with IP54 protection (splash proof)
Integrated LED lights
8 configurable buttons for fast control
Low weight and small size

Type of CT sensor : Flexible Split-Core Type

Inside Diameter : φ200 mm or φ400mm (User Selectable)

Measuring Function : AC/DC Leakage/Line Current

Measuring Method : Dual Integration Mode

Measuring Range : AC/DC 3A/30A/300A/3000A (AC50/60 Hz & DC)

Accuracy : ±3% of reading

Display : LCD max. 3200 reading with Annunciators

Low Battery Indication : B” mark on LCD

Data Hold Function : “DH” Switch

Zero Adjustment : DC current range, by “0 SET” switch

Power Supply : 1.5V (AA size, UM-3) ×6

Calibration Certificate : Calibration Certificate to be provided from any NABL accredited laborator

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