Live test method of line cable joint contact resistance

A contact resistance, live test technology, applied in the direction of measuring resistance/reactance/impedance, measuring device, measuring electrical variables, etc., can solve problems such as high ambient temperature, excessive contact resistance, and the reason cannot be found, and achieve accurate test results. , the effect of avoiding losses

Active Publication Date: 2015-03-11
STATE GRID CORP OF CHINA +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, overheating is not necessarily caused by excessive contact resistance, it may also be caused by high ambient temperature or high peak current
Because of the variety of reasons, it is often impossible to find out the reason when the power failure occurs due to cable failure.
This situation bothers our front-line testers of the power system

Method used

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  • Live test method of line cable joint contact resistance
  • Live test method of line cable joint contact resistance
  • Live test method of line cable joint contact resistance

Examples

Experimental program
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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Such as figure 1 As shown, the voltage online acquisition terminal or the current online acquisition terminal of the present invention samples the tested object, that is, the cable joint, and the data obtained by sampling is transmitted to the wireless handheld receiving terminal in a wireless transmission mode, and the wireless handheld receiving terminal processes the data, stored and displayed.

[0021] Working principle: The contact resistance voltage of the cable joint is collected by the online collection terminal of the voltage at the top of the epoxy resin rod, and the contact resistance current of the cable joint is collected by the current online collection terminal of the top of the other epoxy resin rod. The wireless transmission method is sent to the wireless handheld receiver for data processing to measure the real-time dynamic data of the cable j...

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Abstract

The invention discloses a live test method of line cable joint contact resistance, and solves the problem that measurement and analysis cannot be performed due to overhigh temperature of a cable joint in the running state. The live test method is characterized in that an online voltage collecting terminal or an online current collecting terminal is provided for sampling a tested object, namely, a cable joint, sampled data are wirelessly transmitted to a wireless handheld receiving terminal, and the wireless handheld receiving terminal processes, stores and displays the data. The invention further provides specific structures of the online voltage collecting terminal or the online current collecting terminal and the wireless handheld receiving terminal. Measurement can be performed in a live state, and loss caused by power failure is avoided; dynamic resistance can be accurately measured, and analysis of the actual condition of the cable joint contact resistance is facilitated; and the testing data are direct data, and the test result is accurate.

Description

technical field [0001] The invention relates to a power measurement technology, more specifically to a wireless measurement method for contact resistance of 10kV and 35kV line cable joints in operation. Background technique [0002] At present, with the development of the power system, there will be fewer and fewer power outages, and the country calls for the development of live test technology. This technology is mainly aimed at the 10kV and 35kV line cables in the operation of the power system, and the test is the resistance value of the contact resistance of the joint part when the temperature of the cable joint is too high. In the design and construction of power system cables, a cable will not be laid from the beginning to the end, and there will always be a cable joint in the middle. Therefore, after the construction is completed and the entire cable is put into operation, whether there is a fault in the cable joint is a very important situation. Under normal circums...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/14
Inventor 杨光辉陈强郝赛米东星申琦丁明
Owner STATE GRID CORP OF CHINA
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