Dielectric Testing

We spend much of our life surrounded by electrical devices, but often don’t give a second thought to whether we are protected from shock if the insulation in them fails. We trust the product manufacturers to worry about this for us and to have tested to their relevant product standards.

Dielectric testing (sometimes called HiPot or Power Frequency voltage withstand testing) determines the effectiveness of the insulation systems in electrical devices. The testing does this by subjecting the equipment to test voltages required by the equipment standard (which are much higher than the normal operating voltage of the device), simulating an overvoltage or similar fault.

All insulating material has a point at which it will breakdown when a sufficiently high voltage is applied. The ability of the equipment to withstand these voltages is determined through dielectric testing, after which an insulation voltage is assigned, above or equal to the system voltage to which it will be connected. Another dielectric test that is applied to equipment to determine its safe operation is an impulse or lightning impulse voltage, which determines whether the equipment can withstand high, but short voltage spikes on the electric supply. These impulse levels are determined the location of the equipment in the supply network system in which it is to operate.

The breakdown or stressing of equipment at high voltages creates a measurable discharge, which gives a good indication of the point at which the insulation begins to break down. This Partial Discharge or PD testing is a useful indicator for high voltage equipment manufacturers of the insulation strength of their components and equipment to operate safely over their projected life. As our dielectric testing facility is a highly controlled environment, the background noise level is less than 1picocoulomb (pC), giving a good measurement of the equipment performance under test. This gives our lab an advantage over mobile laboratories or others with a high level of background noise, where this would interfere with the results.

At kA Testing Facility, we perform dielectric testing to industry standards. These standards give instructions, including equipment, calibration and test procedures, for type testing and routine testing of the dielectric properties within equipment. Routine testing is carried out on every piece of equipment that leaves your factory, whereas type testing asses the limits of the insulation.

The below standards allow either Alternating Current (AC) or Direct Current (DC) to be applied to the test specimen. The test voltage, which is dictated either by the product standard or your requirements, is applied to the test object for a set time.

BS EN 60060-1:2010

High-voltage test techniques

BS EN 60060-1:2010 applies to equipment with an equipment voltage over 1kv.

 

BS EN 61180:2016

High-voltage test techniques for low-voltage equipment – Definitions, test and procedure requirements, test equipment.

BS EN 61180:2016 applies to low voltage equipment with a rated voltage of either 1kv AC or 1.5kv DC.

DIELECTRIC TESTING STANDARDS
BS EN 60060-1:2010
High-voltage test techniques

IEC/BS EN 61180 series
High voltage test techniques for low voltage equipment

IEC/BS EN 62271 series
High Voltage Testing

CERTIFICATES AND REPORTS

We offer a range of reports and certificates to meet your requirements.

Please visit the certificates and reports page for further information.

kA Testing Facility,
John Street,
New Basford,
Nottingham,
NG7 7HL,
UK





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