How to measure the temperature of the hot spot of the contact busbar node in high-voltage switchgear

How to efficiently and accurately monitor the operation equipment of the power grid is currently the key problem we are facing. In the transmission and distribution system, high-voltage switchgear is an important equipment that plays an important role in opening and closing power lines, providing monitoring and protection. Its safe and stable operation directly affects the safe and stable operation of the transmission and distribution system. At present, most of the high-voltage switchgear failures that have occurred in multiple domestic units are caused by poor temperature rise caused by various reasons during long-term operation of the switchgear. Therefore, taking effective measures to monitor the temperature rise inside the switchgear is a key issue in preventing such faults from occurring.

The advantages of fluorescent fiber optic temperature measurement devices
(1) Not affected by insulation and electromagnetic interference issues: Fluorescent fiber optic temperature measurement technology uses insulation materials, and the sensing and transmission signals are both optical signals. There is no need to supply power to it during operation, and there is no electrical connection between the sensor and the outside. Therefore, fluorescent fiber optic sensors are used for temperature monitoring of switchgear contacts, and there is no insulation or electromagnetic interference.

(2) Due to its small sensing probe volume, absence of any metal materials, absence of electronic components, good insulation performance, high voltage resistance, long service life, and maintenance free operation, it can monitor and analyze the temperature of switchgear contacts in real-time 24/7.

Reference for installation plan of fiber optic temperature measurement equipment
Installation of fiber optic temperature measurement monitoring host

The monitoring host of the fluorescent fiber optic temperature measurement system is installed in the monitoring cabinet in the control room, and a monitoring computer is set up on the operator console for remote monitoring.

Installation of fiber optic thermometer

The fiber optic thermometer is installed on the back wall of the instrument panel in the upper front of the switchgear to facilitate future maintenance.

Installation of fiber optic temperature sensors

The fiber optic temperature sensing probe can be directly installed in contact with the contact of the switchgear. The main heat source of the switchgear is located at the junction of the static and dynamic contacts, but this area is protected by an insulation sleeve, and the space inside is very limited. Therefore, the design of fiber optic temperature sensors should fully consider this issue, and the installation of accessories should consider maintaining a safe distance from the moving contacts.

The installation at the cable joint of the switchgear can be done by using special adhesive to stick the sensor to the cable joint and then using a special tie to bind and fix it.

Wiring method inside the cabinet: The cables and tail fibers inside the cabinet should be routed as much as possible along the corners of the cabinet or tied together with the secondary wires through dedicated cable trays for easy maintenance inside the cabinet in the future.

Fiber optic temperature measurement system software
The main functions of the software system include local monitoring of real-time temperature, remote monitoring of real-time data, high/low temperature alarms, high/low temperature warnings, historical data playback, pre – and post alarm curves, temperature export, and other functions.

By using fluorescent fiber optic temperature sensors, the monitoring problem of the main heating points in the switchgear has been solved. The application of fluorescent fiber optic temperature measurement technology in switchgear is not affected by insulation issues and electromagnetic interference, has advantages such as high measurement accuracy, small size, long service life, and maintenance free. It can also monitor the temperature of joints in multiple high-voltage switchgear simultaneously. The application of this technology will overall improve the technical level of temperature online monitoring in China’s power industry.

The above plan is for reference only and requires on-site cases, product information, and solutions
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