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Temperature measurement of electrical nodes in switchgear

Temperature measurement of electrical contacts in switchgear is an important aspect of monitoring the operation status of switchgear. Temperature rise monitoring of switchgear is an important component of the power system. The temperature measurement system can use fluorescent fiber optic temperature measurement in switchgear, fiber optic grating temperature measurement in switchgear, wireless temperature measurement in switchgear, infrared temperature measurement in switchgear, and so on.

Why does the high-voltage switchgear heat up

After the high-voltage switchgear is put into operation, the load current flows through its conductive circuit for a long time. Due to the presence of conductive material resistance, heat loss is generated, as well as eddy current loss and dielectric loss heat, which leads to an increase in temperature inside the high-voltage switchgear, especially in the conductive circuit. In actual long-term operation, due to processing technology, material quality, circuit breaker action, oxidation of conductive contact surfaces, and other reasons, the contact resistance value at the contacts and connection parts inside the high-voltage switchgear will continue to increase. Correspondingly, the heating condition of these parts will become more severe. When the heat dissipation level exceeds that part, heat will continue to accumulate, causing the temperature of that part to continuously rise. Excessive local temperature can promote the oxidation process of conductive materials, accelerate the increase of local resistance value, and enter a vicious cycle of “heating aging further heating further aging”. When power outages occur due to overheating faults in high-voltage switchgear, in addition to affecting the power supply reliability and service level of the power grid company, fluctuations or interruptions in power quality can also cause serious economic losses to precision machining or production enterprises. As a result, existing research has conducted many experiments and simulations on the temperature rise problem of high-voltage switchgear. However, due to the complexity of the environment inside the switchgear, no research has summarized the temperature distribution law of the conductive circuit inside the switchgear, as well as the temperature rise law of the main heating points under load current.

The characteristics of the fiber optic temperature measurement system for electrical nodes in switchgear:

1. Strong resistance to electromagnetic environment, and the optical fiber itself has good insulation. The fiber optic conducts optical signals and is not affected by strong electromagnetic interference;

2. The sensor is inherently safe, with no potential accidents such as electric shock, and real-time temperature monitoring;

3. Strong work stability, long service life, long transmission distance, and easy signal aggregation to form a network;

4. Strong backend processing ability, timely warning, and prevention of accidents.

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