The Application Of Direct Current Resistivity Method In Sheath Fault Testing

With the development of social economy and accelerating modernization construction, industrial and agricultural production and people's life of electric power, the growing demand for power is more and more big, the requirement of safety operation more and more is also high. The reliable operation of the power cable directly related to social stability, economic development and people's living standard.Sheath insulation intact is 35kV voltage level above cross-linked polythene cable safety running one of the important marks. Using the fault testing equipment and processing time for the safe cable, significance.Based on the domestic power cable sheath ranging method based on an analysis of the current situation, this paper expounds a kind of power cable sheath fault testing method. This test method based on the dc resistance method, by measuring range finder technology and testing cable sheath between the breakdown of resistance, fault distance.In this paper the method of dc resistance of the system are introduced in detail, and introduces the principle and test of test conditions and range of testing results of the measurement error. A detailed comparison the dc resistance of several common law and other test methods in the Sheath of the test.Based on the method of dc resistance tester developed by High voltage generator unit, signal acquisition unit and operating unit. In the structure design and operation by test, has connected by optical characteristics of accurate, convenient, improving the reliability and safety of the instrument.Based on the introduction of the source is introduced and the subject research significance, In the second chapter of the Sheath fault testing method, detailed introduction and expounds the Direct Current resistivity method in the Sheath of the fault testing, The third and fourth section describes the fault is layer of software and hardware design of the tester, The fifth chapter of the function and the technical index test verification process, and actual cases to reflect the dc resistance method of fault testing Sheath and reliability and safety requirements.