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Overhead line to ground fault locator works

2014-09-20    source：    Author：  Viewed：227

Tags: overhead line fault locator, integral Counts: 1065 times after a fault line outage, first by xjd 100-overhead line ground fault locator transmitter voltage is applied to the line so that the failure to reproduce. Current issued by the transmitter, flows through the fault line in the ground into the ground and through the earth return transmitter.

xjd-100 overhead line ground fault locator transmitter output is pulsating DC signal, the frequency of ultra-low frequency 1Hz, the lower the frequency distribution of the affected system capacity is smaller. In theory, the ability to pure DC signal strongest anti distributed capacitance effects, but using pure DC signal is difficult to avoid magnetic influence, through theoretical calculations and the actual verification, 1Hz signal has been able to meet the needs of the vast majority of field tests.

xjd-100 overhead line ground fault locator transmitter output pulsation period of performance for the constant pressure limiting sources. If grounding transition resistance is less than 80KΩ, the output is a constant current 100mA, voltage resistance increases with larger, but no more than 8KV; If the transition resistance is greater than 80KΩ, the output is constant 8KV, current increases with the increase of the resistance reduced.

Output xjd-100 overhead line to ground fault locator transmitters limit voltage 8KV, equivalent to the peak phase voltage 10KV lines. If the voltage is too high and over the line pressure rating may damage the line (especially access branch cable) The main insulation; too low, it may not make failure to reproduce. This limit pressure value can be factory-tuning according to the special requirements.

Along the line, the sensor through the insulating rod mounted on the line current sensing. Sensor with high sensitivity sensor, the magnetic circuit without closure, in large part to facilitate the hanging, take action. A current sensor for detecting the line, dying operation automatically transmitted wirelessly out to convert the analog signal into a digital signal.

Receiver on the ground receiving sensor sends a wireless signal, intuitive display the measurement results on the LCD screen. Before the point of failure, the current persists after the point of failure, the current disappears. Can be roughly segmented, and then pinpoint to quickly determine the fault location