Vlf Cable Testing

This kind of test is suited for testing high capacitance loads such.

Vlf cable testing. The vlf test instrument should be solidly grounded before connecting up any cables. In the first step a go no go statement is sufficient. Connection setup for a vlf cable connecting a vlf test instrument to a cable refer to ieee 400 2 for safety guidelines. Vlf cable testing is the cutting edge technology for proof testing of fully operating medium voltage cables and the detection of faulty ones.

The major application is for testing solid dielectric cable per ieee 400 2 followed by testing large rotating machinery per ieee 433 1974 and occasionally for testing. The device under test must withstand a vlf very low frequency ac voltage for a preset testing time without flashover. A very low frequency vlf withstand test is an ac withstand test usually carried out at a frequency between 0 1 hz and 0 01 hz. Perform the test as instructed to make best use of vlf technology.

If a vlf test is too low in voltage and or too short in duration more harm than good may result. Vlf systems are advantageous in that they can be manufactured to be small and lightweight. Very low frequency vlf withstand testing is the application of an ac sinusoidal waveform generally at 0 01 0 1 hz to assess the quality of electrical insulation in high capacitive loads such as cables. Because the inherent capacitance of a power cable.

Making them useful especially for field testing where transport and space can be issues. During the test cables are subjected to a test voltage significantly higher than what they experience during normal operating conditions. Hv test lead ground cable figure 4. Vlf cable testing makes use of ac voltages in a frequency range of 0 01.