DC feed system cable insulation strength detection system and method
A cable insulation and strength detection technology, which is applied in the direction of testing dielectric strength, can solve the problems of subjectivity and uncertainty in insulation detection methods, and achieve the effects of simple and practical detection methods, accurate measurement results, and simple structure
Inactive Publication Date: 2015-01-21
HENAN XJ INTELLIGENT CONTROL TECH
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[0004] The purpose of the present invention is to provide a DC feeder system cable insulation strength detection system to solve the problems of subjectivity and uncertainty in the existing insulation detection methods, and to provide a detection method using the detection system
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[0019] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.
[0020] like figure 1 Shown is the structural principle diagram of the embodiment of the cable insulation strength detection system of the DC feed system of the present invention. It can be seen from the figure that the detection system includes a test resistance circuit connected to the two ends of the DC circuit breaker of the tested line. In the test resistance circuit A test resistor is connected in series, and the system also includes a voltage transmitter for detecting the voltage U_s of the feeding section and a current transmitter for detecting the loop current I_p of the test resistor, and the voltage transmitter and the current transmitter The signal output terminal is connected with a control device.
[0021] like figure 1 The current transducer of this embodiment shown is connected in the test resistance loop to test its loop curr...
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The invention discloses a DC feed system cable insulation strength detection system and method. The detection system comprises a test resistor loop for connecting to the two ends of a DC circuit breaker of a line under detection, wherein the test resistor loop is connected in series with a test resistor, a controllable large-power contactor and a test fuse. The detection system also comprises a voltage transmitter for detecting voltage at a feed section and a current transmitter for detecting current of the test resistor loop or detecting current of the feed section, wherein the signal output ends of the voltage transmitter and the current transmitter are connected with a control device. According to the DC feed system cable insulation strength detection system and method, through connecting the test resistor at the two ends of the DC circuit breaker of the line under detection, and through detecting the voltage and current of the feed section, whether the line is insufficient in insulation strength is determined by analyzing residual resistance values and / or residual voltage values so as to prevent the circuit breaker from being closed when the line under detection has short circuit fault.
Description
technical field [0001] The invention relates to a system and method for detecting the insulation strength of cables in a DC feeder system. Background technique [0002] The microcomputer protection and measurement and control unit of urban rail transit DC traction power supply system is suitable for DC feeder protection of urban rail transit DC traction power supply system. The DC feeder cable is used to supply power from high-speed DC switches (ie, DC circuit breakers) to the catenary, and is the "bottleneck" of the DC power supply system. Cables generally use XLPE cables or EPR flexible power cables, and sometimes soft copper tape armor is used to prevent rat bites and increase mechanical strength. However, due to poor laying environment, cables are prone to failure due to insulation aging and damage, which seriously threatens rail transit. Safe operation. [0003] At present, the insulation of rail transit DC feeder cables is generally used to stop the cable and use a m...
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Inventor 刘永祥成印沙李绪勇张文俊樊海松羊阳韩学军汪相坤胡超然席亚举
Owner HENAN XJ INTELLIGENT CONTROL TECH