Railway signal cable insulation low-voltage rapid online testing device and method

Abstract

The invention relates to a railway signal cable insulation low-voltage rapid online testing device and a railway signal cable insulation low-voltage rapid online testing method. The railway signal cable insulation low-voltage rapid online testing device is used for quickly and precisely measuring insulation resistance of a railway signal cable at low voltage, is connected with an external to-be-tested cable and an external insulation leakage current testing device, and comprises a signal sampling and filtering circuit, an ADC chip and communication isolation circuit, a main MCU circuit and a communication circuit, wherein the signal sampling and filtering circuit is connected with the external to-be-tested cable and is used for acquiring data of the external to-be-tested cable; the ADC chip and communication isolation circuit is connected with the signal sampling and filtering circuit, and is used for converting an analog signal adopted by the signal sampling and filtering circuit intoa digital signal and outputting the digital signal; the main MCU circuit is respectively connected with the signal sampling and filtering circuit and the ADC chip and communication isolation circuit;and the communication circuit is respectively connected with the main MCU circuit and the external insulation leakage current testing device. Compared with the prior art, the railway signal cable insulation low-voltage rapid online testing device has the advantages of low output voltage, short measurement time, high precision and the like.

Description

technical field [0001] The invention relates to a detection device for railway signal equipment, in particular to a low-voltage rapid on-line test device and method for insulation of railway signal cables. Background technique [0002] Signal equipment is divided into indoor equipment and outdoor equipment, and the two are connected by signal cables. If the cable is not well insulated from the ground, it will affect the normal operation of the equipment, and seriously affect the abnormal power supply of the power panel, causing systemic equipment failure. Therefore, signal cable insulation testing is one of the important functions of CSM. [0003] There are two disadvantages in the existing signal cable insulation monitoring equipment. First, the measurement voltage is DC500V. When the online measurement is performed, the lightning protection equipment will be activated, which limits the use of the equipment. Second, the measurement internal resistance is large, making the ...

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Problems solved by technology

[0003] There are two disadvantages in the existing signal cable insulation monitoring equipment. First, the measurement voltage is DC500V. When the online measurement is performed, the lightning protection equipment will be activated, which limits the use of the equipment. Second, the measurement internal resistance is large, making the measured The equivalent capacitance charging time of the cable is long, resulting in a measurement time ≥ 10S

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