Ningbo Qiaopu Electric Co., Ltd. power line positive sequence impedance measurement process requirements

Ningbo Qiaopu Electric Co., Ltd. power line positive sequence impedance of the measurement process which requires Ningbo Qiaopu Electric Co., Ltd.
Manufacture of power cable conductor AC resistance and inductance of the cable three phase the same volume and is called the positive sequence impedance.
Positive sequence impedance of power lines is generally in the Ningbo Qiaopu electrical power line drive directly measured, the measurement generally used when a lower voltage, therefore, need to step-down transformer to buck, buck uses star wiring, the general capacity to 11VA or more, have a wider range of voltage regulator, AC power measurements should be relatively stable, to ensure that measurements meet current requirements, the actual voltage meter readings must be the voltage power line, preferably close to the power line test current allow long-term carrying capacity, measured reading of the meter's value, after closing the current three tables simultaneously read the value.