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It is possible to measure the insulation resistance of the transmission line with a megaohmmeter, or to connect an ammeter to the main knife gate, and to connect all mixing station equipment without any equipment. If the ammeter pointer is shaking, the leakage of the transmission line will be indicated.
The way to distinguish is to block the zero-cut line, or if the indicator of ammeter is unchanged, it is the leakage between the phase line and the earth; if the indicator of ammeter is zero, it is the leakage between the phase line and the zero line; if the indicator of ammeter is smaller but not zero, it is the combination of the two.
Remove the shunt fuse or swing the knife gate, if the ammeter indication remains unchanged, the bus leakage will occur; if the ammeter indication is zero, the shunt leakage will occur; if the ammeter indication becomes smaller but not zero, the bus and shunt leakage will occur.
After the above inspection, the switch of the line lamp is switched on in turn. When switching a switch, if the ammeter indicates zero return, the branch line leaks. If the ammeter indication becomes smaller, it indicates that there is leakage in addition to the branch line. Perhaps it is also possible to use a pen-based segmented test. The leakage point can be found by reducing the search plan in turn.
Zhongyuan District, Zhengzhou City, Henan province, China.