Figure 1 typical circuit for dc tests.
High voltage pressure test set.
Pressure test tools.
The current can trip a fault indicator.
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High voltage withstand tests are used in conjunction with partial discharge measurements on solid dielectric cable and accessories within manufacturing plants to ensure the quality of completed cable system components from mv to ehv.
High voltage instruments.
Voltage withstand testing is done with a high voltage source and voltage and current meters.
The earthing switch es is a safety feature and closes automatically when the power is switched off to discharge the capacitor c.
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It is the standard test procedure to use the negative pole of the dc test set and not the positive but nobody has really been able to tell me why.
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An ac high voltage test transformer is again supplied via a variac and a rectifier is used together with a filter capacitor c to limit the ripple to acceptable values.
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Typical dc test set up is shown in figure 1.
T and r test equipment for high voltage dc cable testing.
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Thus it is quite natural for utilities to also use withstand and partial discharge tests as commissioning and maintenance tests for cable.
It applies the necessary voltages to a device and monitors leakage current.
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A single instrument called a pressure test set or hipot tester is often used to perform this test.
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