Ensuring Electrical Integrity with Hipot PD Testing

Hipot Testing: Essential for Assessing Dielectric Strength and Insulation Integrity

A Hipot test, or high potential test, is crucial in evaluating the dielectric strength of electrical insulation within a device under test. This test, also known as a voltage withstand test, involves applying high voltage to a device to ensure that the insulation adequately withstands voltage transients, safeguarding against marginal insulation performance.

Hipot testing is commonly employed alongside Insulation Resistance (IR) testing during commissioning phases. It identifies major defects in the insulation system, such as inadequate creepage or clearance that could have occurred during the device's manufacturing or installation process. This testing is vital to confirm the electrical safety and operating voltage capabilities of the device, ensuring that it meets required standards and specifications.

hipot testing switchgear condition assessment

Detecting and Locating Defects Through Hipot Testing

While hipot testing excels at detecting significant insulation issues, it is paired with Offline Partial Discharge (PD) measurements for a comprehensive assessment. These PD measurements are conducted using a 50Hz power supply, focusing on identifying smaller, more subtle defects in switchgear.

Offline Partial Discharge Measurement at 50Hz

Offline testing for PD is performed using a 50Hz external power supply, coupling capacitor and detecting equipment. We carry out this testing as part of commissioning acceptance or investigation tests in line with the Australian Standard AS 60270 (IEC 60270).

This testing is typically undertaken on busbars and circuit breakers or individual components when tracking down internal sources of PD detected using online techniques. It is a much more accurate and sensitive test than withstand testing.

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Testing with a 50Hz power supply (high voltage but low power) means that cables and voltage transformers are generally disconnected during test due to their inherent capacitance. Testing long busbars or switchgear with cables connected will be done using a VLF power supply.

Very Low Frequency (VLF) Testing

VLF testing can be more advantageous compared to hipot and offline PD testing of extensive cable systems due to the minimal power required—500 to 5000 times less than a standard 50Hz supply (ranging from 0.1 to 1Hz). This method enhances the practicality of testing, making it a preferred approach for comprehensive diagnostic assessments.

Get Started with Expert Hipot and VLF Testing Services

Are you ready to enhance the electrical safety and integrity of your systems with professional Hipot testing? EA Technology offers expert services to conduct Hipot and VLF Testing.