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Huaian, Jiangsu: Small-current single-phase grounding line selection test successfully

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2019-12-16 Time: 2019-12-16
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"This test effectively considered the comprehensive performance of the manufacturer's line selection device. After the small current single-phase ground fault line selection device was put into operation in the distribution network, under the 10 kV line ground fault condition,

The selection of the fault line name and phase sequence will be completed shortly, which will greatly shorten the power failure time and range, and will also end the way of manually finding the fault for many years. Zhang Wenxin, the person in charge of the field work, said.

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According to the site understanding, the test simulates the real ground fault via the 10 kV output line with different resistance transition resistances, and connects the fault signal to 16 ground selection devices from 13 manufacturers at the same time.

Verify the line selection and phase selection capabilities of each device. Six types of tests, including metal grounding, 200 to 2000 ohm transition resistance grounding, and arc grounding, were conducted on site, covering the actual operation of the line.

Various common single-phase ground fault types in the process.

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In recent years, the power grid has developed rapidly, and a large number of power cables have been put into operation, which has led to a sharp increase in the capacitance current of the distribution network.

Power regulators still perform fault line selection through the traditional manual pull method, which is not only time consuming and laborious, but overvoltage or resonance caused by long-term grounding may cause insulation breakdown of non-faulty phases.

Even causing phase-to-phase short-circuit faults and prolonging the power customer's power outage, it also seriously affects the reliability of the power supply network.

In order to solve this problem, the power supply department has increased the application research of various grounded line selection devices, analyzed the line selection results on a monthly basis, and rectified the actual problems of field line operation, while continuously improving the utilization rate of the distribution automation system

To improve the accuracy of grounding line selection and achieve efficient and economical operation of distribution lines. And continuous improvement and improvement of small current ground fault processing technology is an effective way to enhance the role of distribution automation systems,

The test of single-phase ground fault line selection for small current under real environment has real practical value this time.