High-voltage power cable sheath current sensor broken line identification method and device

A technology of current sensor and sheath current is applied in the field of disconnection identification of sheath current sensor of high-voltage power cable, which can solve the problem that sheath current monitoring is prone to false alarms, etc. Simple control logic

Inactive Publication Date: 2019-02-22
XUJI GRP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-voltage power cable sheath current sensor disconnecti...

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  • High-voltage power cable sheath current sensor broken line identification method and device
  • High-voltage power cable sheath current sensor broken line identification method and device
  • High-voltage power cable sheath current sensor broken line identification method and device

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] The purpose of the present invention is to provide a high-voltage power cable sheath current sensor disconnection identification method and device, which are used to realize the real-time monitoring and fault early warning of whether the secondary circuit of the high-voltage power cable sheath current sensor is normal, and to improve the efficiency of the sheath circulation monitoring device. Practicality level.

[0022] To achieve the above object, the steps of the inventive method comprise:

[0023] 1. Single-phase disconnection judgment of the cable sheath current sensor: when the sheath current of a certain phase is 0, while the other two phase sheath currents exist, it can be considered that the phase with the sheath current of 0 has a secondary circuit disconnection;

[0024] 2. Discrimination of two-phase disconnection of the cable sheath curre...

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Abstract

The invention relates to the high voltage power cable detection field and especially relates to a high-voltage power cable sheath current sensor broken line identification method and device. Through detecting the three-phase sheath current of a high-voltage power cable, and simultaneously detecting a load current, logic determination is performed according to the conditions of whether the sheath current is zero and whether the load current is zero so as to acquire whether a sheath current sensor on the high-voltage power cable has a broken line. The sheath current is transversely compared, a relation between the sheath current and the load current is combined to determine, and the discrimination function of a single-phase broken line, two-phase broken line and three-phase broken line is possessed so that the hidden danger of cable sheath current loop disconnection is solved. Hardware cost does not need to be increased, control logic is simple and realization is easy.

Description

technical field [0001] The invention relates to the field of high-voltage power cable detection, in particular to a method and device for identifying disconnection of a sheath current sensor of a high-voltage power cable. Background technique [0002] The metal sheath of 110kV and above single-core cables generally adopts the operation mode of cross-connected double-ended grounding or single-ended direct grounding. Under normal circumstances, the metal sheath has only tens of volts of induced voltage to the ground, and the induction voltage of several amps to tens of amps. current. If the cable sheath is damaged due to chemical, mechanical or rodent pests and other reasons and is grounded at multiple points, the circulation of the metal sheath to the ground will rise to a dangerous level, and continuous heating will affect the performance of the insulating material, which is a serious safety hazard. Discover and take action. The high-voltage power cable sheath current moni...

Claims

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Application Information

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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 路光辉李自强倪传坤徐伟强焦坡张乔宾雍明超牧继清毛丽娜兰五胜郭旭卢声陈献庆
Owner XUJI GRP
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