What is HV tester?
High Voltage testing is usually performed to qualify the device to operate safely during rated electrical conditions, a way to check the effectiveness of its insulation. The objective sought during the high voltage testing will determine the type and amount of voltage applied and the acceptable current flow.
What is the purpose of HV test?
High voltage type test A high voltage is used to verify that the clearances and solid insulation of components have adequate dielectric strength to resist expected overvoltage conditions [3]. It also shows that the equipment is able to work safely over its complete lifetime.
How do you perform a HV test?
The testing procedure is very simple. High voltage is applied across a specimen of insulation or equipment under test by means of a high voltage transformer. A resistor is connected with series with the transformer to limit the short circuit current in the event of breakdown occurred in the device under test.
What is the specialty of HV testing?
To check whether they are as per the design and as per specifications and standards. To ensure that the HV equipment is able to withstand over voltages produced naturally or within the system.
How do you measure 11kv voltage?
Theoretically, assuming your low range meter was ranged for 110V, you could measure the actual resistance of your voltmeter (coil resistance plus multiplier), multiply that value times 99, put that amount of resistance in series with your meter thus creating a total resistance 100 times as great as before, which would …
What is the test voltage for HV test?
High voltage a.c. tests at 50 Hz are carried out as Routine tests on low voltage (230 or 400 V) equipment. Each one of these devices are subjected to a high voltage of 1 kV + 2 × (working voltage).
What is testing of electrical equipments?
Electrical testing is an extremely broad term that covers many different areas of inspection of systems that use electrical currents to flow. Electrical testing ensures that several different aspects of the electrical system are in proper working.
How is HT voltage measured?
Potential transformers are used to measure high tension voltages. They are fix ratio transformer with very high accuracy. They are step down T/F with secondary voltage measurable by voltmeter.
What voltage is 11kV?
High voltage (HV) – means and voltage exceeding 1kV a.c. or 1.5kV d.c. Extra high voltage (EHV) means any voltage exceeding 220kV….Standard line voltages.
| Line Voltages | Usage |
|---|---|
| 11kV | Used for urban and rural HV distribution |
| 22kV | |
| 12.7kV (SWER) | |
| 22kV |