Research, design, manufacture leakage current protection device for 660V/1140V underground mine electrical networks

  • Affiliations:

    1 Faculty of Electro-Mechanical, Hanoi University of Mining and Geology

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  • Received: 15th-Aug-2020
  • Revised: 23rd-Oct-2020
  • Accepted: 31st-Oct-2020
  • Online: 31st-Oct-2020
Pages: 96 - 103
Views: 1860
Downloads: 868
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This paper presents the results of researching, designing and manufacturing leakage current protection device for 660 V/1140 V ungrounded three-phase electrical networks. The outstanding features of the device are: ability to create wide deformation characteristic; automatically detect and grounded the leakage phase. Device test results show that relay operation time ​​for symmetrical and asymmetric leak resistors are 30 kΩ/60 kΩ per phase and 20 kΩ /50 kΩ for 660 V/1.140 V networks respectively. The total operating time of the device when single phase leaking through a 1 kΩ resistor not exceed 105 ms. The circuit automatically detects and accurately grounded the leakage phase through 100 Ω resistance, the total detection and grounded the leakage phase time does not exceed 110 ms. This research result can be applied in the design and manufacture of high-quality and reliable leakage current protection devices used in underground mines, replacing imported products.

How to Cite
Nguyen, K.Thac, Kim, L.Ngoc, Nguyen, S.Tien and Nguyen, G.Truong 2020. Research, design, manufacture leakage current protection device for 660V/1140V underground mine electrical networks (in Vietnamese). Journal of Mining and Earth Sciences. 61, 5 (Oct, 2020), 96-103. DOI:

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