Joint waterproof detection system and detection method

Abstract

The invention discloses a joint waterproof detection system and detection method. The detection system comprises a main body water tank, a temperature and humidity sensor and a data acquisition device, wherein the temperature and humidity sensor is placed in a to-be-detected joint, the to-be-detected joint is placed in the main body water tank, the data acquisition device is in communication connection with the temperature and humidity sensor so as to determine whether the to-be-detected joint fails or not based on temperature and humidity parameters acquired by the temperature and humidity sensor; the main body water tank is provided with a water inlet, and the water inlet is connected with a water inlet valve and a constant-pressure water pump; the main water tank is provided with a water outlet, and the water inlet is connected with a drain valve; the main water tank is also connected with a circulating water pump, one end of the circulating water pump is connected with a water inlet valve of the main body water tank, and the other end of the circulating water pump is connected with a drain valve of the main body water tank through a check valve. According to the invention, theproblems of electric energy supply and temperature and humidity signal transmission of the built-in temperature and humidity sensor are solved, and the technical effect of directly measuring the temperature and humidity in the cable joint is achieved.

Description

technical field [0001] The invention relates to the field of cable joints, in particular to a joint waterproof detection system and detection method. Background technique [0002] The faults caused by water ingress and moisture in the middle joint of the cable account for about 61% of the total faults of the cable head. Water ingress and dampness of cable joints is the main cause of cable failures. At present, the cable defect detection methods put into use at home and abroad include dielectric loss method, time domain reflection method, oscillatory wave method and partial discharge method. The above-mentioned methods are introduced in detail: [0003] 1. The dielectric loss detection method can judge whether there is a defect in the tested cable, but it cannot locate and quantitatively identify how much water has entered. [0004] 2. The time domain reflection method can judge the water ingress of the tested cable, but the reflection signal of this method is weak, and the...

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Problems solved by technology

[0003] 1. The dielectric loss detection method can judge whether there is a defect in the tested cable, but it cannot locate and quantitatively identify how much water has entered

[0004] 2. The time domain reflection method can judge the water ingress of the tested cable, but the reflection signal of this method is weak, and the received signal contains multiple reflections, and it is difficult to eliminate the interference of environmental noise, resulting in a low detection result accuracy

[0005] 3. Oscillating wave voltage method is more effective in detecting defects of misused insulating tape on the surface of crimping tubes, but not obvious in detecting other defects

That is to say, partial discharge is more sensitive to discharge defects, but the operating parameters of the cable in the early stage of water entering the cable joint will not change much, so the partial discharge method is not suitable for detecting whether the cable joint is wet or not.

[0007] To sum up, there is currently no effective equipment or effective means to monitor the water ingress of the cable intermediate joint

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