Vehicle-mounted long-distance on-site frequency conversion AC voltage withstand test system

Abstract

Provided is a vehicle-mounted long-distance on-site frequency conversion AC voltage withstand test system, which comprises a truck and a container, wherein the container is arranged on the truck. The container is provided with a test system. The test system is formed by a test room and a frequency conversion resonance test system. The container is internally provided with a variable-frequency power source. An intermediate frequency excitation transformer is arranged beside the variable-frequency power source. The intermediate frequency excitation transformer is connected with an adjustable reactor. The adjustable reactor is provided with a capacitive voltage divider and a tuning capacitor. By directly arranging the test system on the truck, requirements of different test sites can be met, and frequency conversion AC voltage withstand test of a cable can be directly carried out in remote sites, thereby expanding test range; and the container is arranged in a pulling manner, so that a housing can be pulled open in the transport process to allow the whole test system to be placed therein, thereby preventing equipment from being polluted in the transport process, which may influence test effect.

Description

technical field [0001] The invention relates to a test system, in particular to a vehicle-mounted long-distance on-site frequency conversion AC withstand voltage test system. Background technique [0002] Common methods for power cable field tests include: DC withstand voltage, power frequency withstand voltage, ultra-low frequency withstand voltage, frequency conversion resonance method and oscillatory wave test. Among them, when the DC withstand voltage test method is used, the cable state under operation cannot be truly simulated. The insulation defect of the cable cannot be effectively found, and the DC voltage will also accelerate the aging of the cable insulation; the power frequency withstand voltage test method is the closest to the field use condition, but the test equipment is bulky; the ultra-low frequency withstand voltage test method is equivalent, but super The generation of high voltage at low frequency has become the bottleneck of product development. At pres...

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Problems solved by technology

[0002] Common methods for power cable field tests include: DC withstand voltage, power frequency withstand voltage, ultra-low frequency withstand voltage, frequency conversion resonance method and oscillatory wave test. Among them, when the DC withstand voltage test method is used, the cable state under operation cannot be truly simulated. The insulation defect of the cable cannot be effectively found, and the DC voltage will also accelerate the aging of the cable insulation; the power frequency withstand voltage test method is the closest to the field use condition, but the test equipment is bulky; the ultra-low frequency withstand voltage test method is equivalent, but super The generation of high voltage at low frequency has become the bottleneck of product development. At present, it is only used in the test of XLPE cables below 35kV; gap; the frequency conversion resonance withstand voltage test has good equivalence, the equipment is compact in structure, lighter in weight than the power frequency withstand voltage system, and easy to transport and disassemble

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