High Voltage Insulator Testing

Before going through testing of insulator we will try to understand different causes of insulator failure because insulator testing ensures the quality of electrical insulator and chances for failure of insulation depend upon. To ensure the desired performance of an electrical insulator that is for avoiding unwanted insulator failure each insulator has to undergo numbers of insulator test. The insulator under test is mounted in the same manner as in above tests.

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This means testing on insulators is an extremely high priority for knowing how your assets are performing.

High voltage insulator testing.

The univerity of lahore. An impulse voltage generator which generates a very high voltage at a frequency of several hundred kilohertz is connected to the insulator. After the connections are made the test voltage is applied and the ir is read at two different times. Type tests are done on samples when new designs or design.

Type tests and. Type tests are intended to prove or check the design features and the quality. Tests on insulators the tests on insulators can be divided into three groups. High voltage insulator testing.

The high voltage test on insulators that are normally conducted are usually subdivided as. Sir usman zahid by. Partial electrical discharges are the key indicator of insulator deterioration. A dielectric withstand test or pressure test high potential or hipot test is an electrical test performed on a component or product to determine the effectiveness of its insulation the test may be between mutually insulated sections of a part or energized parts and electrical ground.

There are almost always some sparks partial discharges that weaken the material. Usually either 30 and 60 sec or 60 sec and 10 min. Hv testing of insulator 1. The test is a means to qualify a device s ability to operate safely during rated electrical conditions.

The insulation test involves subjecting the equipment or product or hardware to accelerated conditions of temperature humidity and dc voltage bias to force moisture induced corrosion and. This test recognizes the fact that good insulation will show a gradually increasing ir after the test voltage is applied. This voltage is applied to the insulator and spark over voltage is noted. The routine tests are intended to check the quality of the individual test piece.

If the insulation remains intact under the impact of high test voltage then the equipment is considered safe for the user under normal operating conditions.

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