Troubleshoot electrical equipment, things you don’t know!

In the power transmission and distribution system of the factory, there are a large number of electrical equipment such as contacts, switches, casing clips, etc., often due to various reasons such as poor contact, corrosion or internal abnormalities, abnormal hot spots appear, which seriously affects the safe power supply.

In the power transmission and distribution system of the factory, there are a large number of electrical equipment such as contacts, switches, casing clips, etc., often due to various reasons such as poor contact, corrosion or internal abnormalities, abnormal hot spots appear, which seriously affects the safe power supply.

The use of thermal imaging cameras can accurately detect hot spots, eliminate hidden dangers in time, and ensure the safety of power supply. Let’s take a look at the actual case of testing in a factory.

1. Practical cases of “general defects”

“General defect”, its temperature rise range is between 10 ~ 20 ℃, the temperature at the P0 joint in the figure below, compared with the P1 and P2 joints under the same operating conditions, the joint has a certain temperature rise, measured with a thermal imager There is only a slight thermal image feature. Attention should be paid to this situation, check whether it is caused by the overload current exceeding the standard, and strengthen the tracking to prevent the defect from deepening.

Troubleshoot electrical equipment, things you don’t know!

In addition, it should be noted that although the relative temperature difference is small, pay attention to check the load condition. If it is in the case of a low load rate, it means that once the load rate increases, the temperature of the electrical joint defect of the equipment will increase sharply.

2. Practical cases of “serious defects”

“Serious defect”, the temperature rise of the hot spot is between 20 and 40°C, or the actual temperature is between 60 and 80°C, or the temperature difference between the phases of the equipment is between 1.5 and 2.0 times, and the thermal image features are obvious. Severe thermal damage has been caused, posing a serious threat to equipment operation.

Troubleshoot electrical equipment, things you don’t know!

Such thermal defects should be monitored for a long time after the overload condition is confirmed to avoid further deterioration of thermal defects. When production conditions allow or are necessary, adjustments should be made in a timely manner to avoid major economic losses.

3. Practical cases of “critical defects”

“Critical defect”, the temperature rise of the hot spot exceeds 60℃, or the maximum temperature has exceeded the maximum allowable value of the material specified in the national standard GB763-90. The temperature of phase A of the capacitor connector in the figure below is 99.2°C higher than that of phase C, which is a “critical defect”.

Troubleshoot electrical equipment, things you don’t know!

After careful inspection, it is actually that the aging of the A-phase connector leads to poor contact, and the resistance value increases, resulting in abnormally high temperature. The thermal image of such defects is very clear, and such defects may cause sudden accidents at any time, and should be immediately withdrawn from operation and overhauled.

The Links:   G240HVT010 LM10V332 BSM20GP60

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