Power cable positioning method for ground faults of sheath layer and armor layer

A technology for power cables and ground faults, which is applied to the fault location, detects faults according to conductor types, and measures electricity. It can solve the problems of ground resistance affecting positioning accuracy and low positioning accuracy, and achieve the effect of avoiding the evolution of single-phase ground faults.

Pending Publication Date: 2020-09-08
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0005] In order to solve the problem of low positioning accuracy in existing cable fault location methods, the present invention proposes a power cable location method for ground faults in the sheath layer and armor layer, which solves the problem that the grounding resistance affects the location accuracy, and improves the Accuracy of cable fault location

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  • Power cable positioning method for ground faults of sheath layer and armor layer
  • Power cable positioning method for ground faults of sheath layer and armor layer
  • Power cable positioning method for ground faults of sheath layer and armor layer

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Embodiment Construction

[0024] see figure 2 , figure 2 It is the wiring diagram of the three-phase voltage measurement method for the cable outdoor terminal. Install voltage transformers on the outdoor terminals of cables. The voltage transformer consists of primary windings 1, 2, 3 and secondary windings 4, 5, 6. The six windings are all three-phase windings, and the primary windings 1, 2, and 3 are respectively the core layer winding, the sheath layer winding, and the armor layer winding. , The cable core layer of C phase, the sheath layer of cable A, B, C phase and the armor layer of cable A, B, C phase, the tail end is grounded after star connection. The secondary windings 4, 5, and 6 are also star-connected, a 1 , b 1 、c 1 The first end and the tail end of the phase winding are connected to 4 voltage signal input terminals of the locator 7; a 2 , b 2 、c 2 The first end and the tail end of the phase winding are connected to 4 voltage signal input terminals of the locator 8; a 3 , b 3...

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Abstract

The invention discloses a power cable positioning method for ground faults of a sheath layer and an armor layer, and the method comprises the following steps: installing a voltage transformer on an outdoor terminal at the head end of a cable line, and respectively measuring three-phase voltage signals of a cable core layer, the sheath layer and the armor layer through the voltage transformer; installing a current transformer the an outdoor terminal head at the head end of the cable line; respectively measuring three-phase current signals of the cable core layer, the sheath layer and the armorlayer through a current transformer; calculating the positive sequence, negative sequence and zero sequence voltage and current of each layer of loop at the fault point; calculating a grounding current; and further calculating the fault position of the cable line. The fault positioning method is not influenced by fault resistance, the grounding hidden danger of the cable line can be effectively positioned only according to the voltage and current information measured at the head end of the cable line, the single-phase grounding fault probability of the cable line is greatly reduced, and the fault positioning method has the advantages of being simple, convenient and practical in calculation method and high in positioning precision.

Description

technical field [0001] The invention relates to a method for locating a power cable for a grounding fault of a sheath layer and an armor layer. Background technique [0002] With the rapid development of the economy, the city's power consumption is increasing day by day, and the city's power supply network has been transformed from overhead lines to cables. However, due to the impact of cable quality and urban pipe network construction, faults occur from time to time. However, once a cable fails, it will take a long time to find the fault point until the fault is repaired, which greatly reduces the reliability of power supply. Therefore, it is of great significance to find out the hidden dangers of cable faults in time and accurately locate the faults to ensure the safe operation of the distribution network. [0003] At present, many scholars have conducted a lot of research on this, and proposed many fault location methods. The existing fault location methods can be divi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52G01R31/58
CPCG01R31/083G01R31/52G01R31/58
Inventor 王媛媛宋勤曾祥君李泽文郭永生谢超
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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