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What are the requirements of the cable line positive sequence impedance measurement process?

Feb 16, 2017

The cable conductor AC resistance and cable three-phase inductance of the phasor and called the positive sequence impedance.

Cable line of the positive sequence impedance can be measured directly on the cable tray, measuring the general use of lower voltage, therefore, need to use step-down transformer for buck, buck using star wiring, the capacity is generally more than 10kVA, there are A wide range of voltage regulation, measurement of AC power should be more chaotic to ensure that the current measurement to meet the requirements of the actual voltage meter must read the value of the voltage is really a test, the test current is best close to the cable long-term commitment to load , Read the value of each meter, close the current after reading the three tables at the same time the value.