Test Capabilities
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Partial Discharge Testing
Partial discharge testing according to IEC 60270
Testing in a range of environmental conditions including temperatures from -50 °C to 200 °C and altitudes to 100,000 ft
DC and AC voltages from 50 Hz - 2000 Hz
Square-wave partial discharge testing according to IEC 61934
Breakdown Voltage Measurement
Breakdown voltage measurements can be conducted on a wide range of test objects including polymer films, insulated wires (including those use in electrical machines), connectors and power electronic modules. Testing is possible at a range of temperatures and with DC / AC / square-wave voltages.
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Voltage Endurance / Partial Discharge Resistance
Energisation of multiple insulation samples or components can be performed with DC, AC or square-wave voltages and evaluate their time to failure enabling better predictions of lifetime in systems subject to electrical ageing. Physical changes to specimens (such as erosion depth) can be measured in a variety of testing environments (see picture).
Insulation Lifetime Assessment
Testing campaigns such as those described in IEC 60034 are regularly conducted to determine how long insulation systems will last. A set of diagnostic tests is combined with ageing in ovens and the use of a vibration shaker. Estimation of the lifetime of an insulation system is performed when operated at a specific temperature.
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Insulation Properties
Whether it's measurement of insulation conductivity, permittivity, comparative tracking index (CTI), tensile strength or breakdown strength, the properties of the insulation material according to IEC and ASTM standards are assessed. Testing is often performed under a range of conditions to evaluate the change in material properties when used in different environments.
Chemical & Oil Compatibility
With more insulation systems used in oil and in the presence of other chemicals, confirming their compatibility and resistance to rapid ageing has never been more important. A full range of insulation types can be tested when exposed to chemicals, and it can be confirmed that there are no significant changes to their properties.
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Creepage Distance Assessment
Creepage distances are essential in any electrical system but can also be impacted by pollution. Methods to measure pollution levels in real environments, deposition of pollution onto electrical parts and the ability to test these in humid conditions (including at altitude) were developed at the laboratory premises.
Temperature Rise & Thermal Cycling
Currents of over 1000 A can be passed through test objects using DC or AC at frequencies between 50 Hz and 2000 Hz. AC tests are particularly useful in electrical systems where the temperature rise may be impacted by the skin effect. Test objects can also be thermally cycled to examine the impact of differential thermal expansion.
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Arcing
During arcing, a significant amount of heat is released, increasing the temperature of the surrounding and could have catastrophic consequences. It must be ensured that, in the event of an arc, the safe operation of HV systems is not compromised.
The wet arc-resistance test for wire insulation provides an assessment of the ability of cable insulation to prevent damage when exposed to specific environmental and electrical conditions.
Comparative Index Tracking (CTI)
CTI test is a standardised method used to assess the electrical insulating properties of solid materials under moist or contaminated conditions.
It measures the material's resistance to electrical tracking, which occurs when localised degradation forms conductive paths on the surface of an insulating material due to moisture, contaminants, and electrical stress.
During this test, a specified voltage is applied between two electrodes placed on the sample's surface, while a liquid contaminant is dripped between them.
It measures the material's resistance to electrical tracking, which occurs when localised degradation forms conductive paths on the surface of an insulating material due to moisture, contaminants, and electrical stress.
During this test, a specified voltage is applied between two electrodes placed on the sample's surface, while a liquid contaminant is dripped between them.
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