Temperature measurement of static contacts in switchgear

Glasvezel temperatuursensor, Intelligent monitoring system, Distributed fiber optic manufacturer in China

The necessity of a temperature monitoring system for switchgear contacts

A substation is an important component of the power system. The circuit breakers, bus joints, cable joints, transmission and transformation line joints, outdoor isolation switches and other important equipment of a substation can easily cause fires and large-scale power outages due to aging or excessive contact resistance in the contacts and bus connections of switches during long-term operation. With the upgrading of power equipment, most power plants and substations currently use switchgear for power transmission. Due to the inability of switchgear to open during operation, it is impossible to measure the actual temperature and current information of the high-voltage static contacts inside the switchgear during operation. The high-voltage static contacts inside the switchgear are prone to loosening and oxidation when operating in complex environments for a long time. In situations such as overloaded operation and poor installation, the resistance of the contact surface will gradually increase. When the load current flows through, the temperature of the high-voltage static contacts will rise or even burn out, causing large-scale power outages and posing significant safety hazards. Daarom, real-time monitoring of cooling and current information of the high-voltage static contacts inside the switchgear is extremely important.

In recent years, the increase in power equipment has led to an increasing number of faults caused by high-voltage switchgear exceeding the temperature rise standard. According to FJINNO’s understanding, many power companies and enterprise users have experienced power grid accidents caused by abnormal temperature rise of enclosed busbar and isolation switch components to varying degrees. The root cause is the heating of the switchgear contacts. Daarom, it is necessary to conduct real-time detection and monitoring of the temperature of the contacts in the substation switchgear, detect abnormal temperature rise of the contacts in a timely manner, and respond early to eliminate safety hazards, which can greatly reduce losses caused by abnormal temperature rise of the contacts and ensure the safe and reliable operation of the switchgear. The switchgear contacts are important equipment in the power grid, which can ensure the safe operation of the power grid and timely protect the power grid in case of faults. The contact is an important component of the circuit breaker and isolation switch in the switchgear. When the contact is not in good contact, its contact resistance will increase, and overheating may occur when connecting the load circuit. Overheating may cause high-voltage switch failure, and even lead to continuous discharge, causing significant safety hazards for personnel, directly affecting the reliable operation of the power grid, and even causing significant economic losses. Echter, the contacts are generally installed inside the switchgear and are often surrounded by SF6 gas and the enclosure of the switchgear. When detecting the temperature of the contacts, there should be no situation where the internal insulation is damaged due to the escape of SF6 gas. Daarom, there is a great difficulty in temperature detection and monitoring of the switchgear contacts.

Temperature measurement device for switchgear contacts

Temperature measurement method for switchgear:

1、 Indirectly monitoring the temperature rise of the high-voltage switch by monitoring the circuit resistance;

2、 The infrared thermal imager measures the temperature of the casing to estimate the internal contact temperature and temperature rise.

Echter, both of the above temperature monitoring methods indirectly monitor the contact temperature, and the measurement results may be inaccurate. The traditional high-voltage static contact temperature measurement device has problems such as complex operation, poor safety, inaccurate and fast measurement, inability to obtain real-time measurement data, single measurement type, and can only be used to measure temperature information.

FJINNO’s independently developed fluorescent fiber optic temperature sensor can use a fiber optic temperature measurement system for real-time temperature monitoring of the contacts of switchgear circuit breakers and isolation switches. The fiber optic temperature measurement system has a simple structure, convenient use, high measurement accuracy, and is easy to promote and use. The price of the fiber optic temperature measurement system for measuring the temperature of the dynamic and static contacts of circuit breakers is reasonable. Welcome to cooperate as an agent!