Vlf Cable Testing

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.

Making them useful especially for field testing where transport and space can be issues. Hv test lead ground cable figure 4. Vlf cable testing very low frequency is a technique for testing of medium and high voltage mv and hv cables. During the test cables are subjected to a test voltage significantly higher than what they experience during normal operating conditions.

The device under test must withstand a vlf very low frequency ac voltage for a preset testing time without flashover. Perform the test as instructed to make best use of vlf technology. 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. This kind of test is suited for testing high capacitance loads such.

When vlf withstand testing cable the proper test voltage and time duration are critical for the success of the test. The vlf test instrument should be solidly grounded before connecting up any cables. In the first step a go no go statement is sufficient. Because the inherent capacitance of a power cable.

Vlf cable testing makes use of ac voltages in a frequency range of 0 01. Vlf testing is not only used for testing solid dielectric cable any application requiring ac testing of high capacitance loads can be tested using very low frequency. 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. If a vlf test is too low in voltage and or too short in duration more harm than good may result.