A fault location method based on the difference of thermal characteristics of gil distribution
A technology of fault location and thermal characteristics, applied in the direction of fault location, fault detection according to conductor type, instrument, etc., can solve the problem of judging GIL fault section from the angle of difference in thermal characteristics, achieve obvious difference in temperature change rate, and improve accuracy , the effect of improving reliability
Active Publication Date: 2021-07-27
CHINA UNIV OF MINING & TECH
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[0005] The purpose of the present invention is to provide a fault location method based on the difference in GIL distribution thermal characteristics, solve the problem of judging the GIL fault section from the perspective of thermal characteristic difference, consider the distribution thermal characteristic difference of the entire line, and compare the left and right sides of the fault point. Differences in temperature change rate curves, proposed to realize fault location based on differences in GIL thermal characteristics
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[0036] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0037] like figure 1 As shown, the fault location method based on GIL distribution thermal characteristic difference of the present invention, its steps are as follows:
[0038] Step S1: On the shell of the GIL busbar, find the installation temperature monitoring points for the entire line where high temperature and faults are prone to occur. The above-mentioned high temperature and fault prone points are pot insulators and conductor contacts that are easily affected by high temperature and cause insulation and material aging ;When choosing to install the temperature monitoring point on the flange structure connecting two independent air chambers of GIL; when detecting the expansion joint of GIL, there are conductor contacts under each expansion joint, including sliding contacts and fixed contacts, conductors The contact is the place where contact...
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A fault location method based on the difference of GIL distribution thermal characteristics belongs to the fault monitoring of GIL fault and abnormal heating. First, install temperature monitoring points at a certain distance on the outer surface of the shell of the entire line, so that the entire line can be monitored comprehensively; secondly, the temperature of the shell is obtained through the thermal characteristic model, and the temperature change of the shell under normal operating conditions is deduced through the formula The temperature change rate is used as the basic condition for fault judgment; then, the abnormal temperature change rate of the housing during fault operation is deduced; again, the abnormal temperature change rate on the left and right sides of the fault point is calculated to realize fault location; the present invention determines the GIL Distribute thermal characteristic differences to realize fault location. Calculate the rate of change and draw a curve through the temperature monitoring points, and compare two adjacent points in turn to find out the faulty section of the entire line. It can further accurately reflect the state of the line, and enhance the reliability and security of the line.
Description
Technical field: [0001] The invention relates to a fault location method based on the difference of GIL distribution thermal characteristics, which belongs to the fault location of GIL abnormal heating. Background technique: [0002] With the development of high-voltage AC transmission construction, the application of gas-insulated transmission line GIL in UHV transmission projects has increased significantly, and the operation and maintenance of long-distance GIL transmission lines is complicated. The methods are complicated and time-consuming. If it cannot be identified and located in time, it may lead to long-term outage of this section of GIL and cause huge economic losses. In order to meet the increasing automation and intelligence of power grid management and operation, and improve the convenience of GIL operation and maintenance, data acquisition and monitoring systems are gradually widely used in transmission lines. [0003] In order to further realize the automatic...
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IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 梁睿乔宇娇高鹏唐泽华钦宇轩
Owner CHINA UNIV OF MINING & TECH