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The types of temperature measurement methods for switchgear and the advantages of fluorescent fiber optic temperature measurement

There are many ways to use temperature measurement devices for high-voltage switchgear, and in the entire temperature measurement market, the products and types make it difficult to choose a manufacturer. There are high-tech fiber optic monitoring methods for temperature measurement devices, as well as traditional PT100 electronic temperature measurement.

Types of temperature measurement methods for switchgear

The three most commonly used types in the temperature monitoring market for switchgear are infrared temperature measuring devices, wireless temperature measuring devices, and fluorescent fiber optic temperature measuring devices.

The three temperature measurement products differ in their temperature measurement methods:

The infrared temperature measurement system uses infrared light to detect temperature rise and decrease;

The wireless temperature measurement system uses thermosensitive materials for temperature sensing, and wirelessly transmits data to achieve temperature measurement analysis;

The point fluorescence fiber optic temperature measurement system uses fluorescence fiber optic technology and fluorescence lifetime temperature measurement principle to sense the temperature changes of the circuit breaker, contact, and busbar in the switchgear, and transmits temperature signals through fluorescence transmission fiber optic. Through technical principle analysis, accurate temperature values are obtained. Although all three temperature measurement products can achieve temperature monitoring function, there are significant differences in temperature measurement accuracy, safety, reliability, stability, and other aspects due to differences in temperature measurement methods and principles.

Advantages of infrared thermometer for switchgear


The infrared thermometer equipment is relatively compact and suitable for manual factory inspections and routine temperature checks.

Multiple application scenarios

The infrared thermometer can measure the internal temperature of the switchgear at a long distance, which can meet the needs of temperature monitoring under different conditions. However, it is easily affected by light and enclosed obstacles, and high-voltage switchgear temperature monitoring cannot be used.

Disadvantages of infrared thermometer for switchgear

Large temperature measurement error

Due to its non-contact nature, the infrared thermometer for switchgear can be used to determine the temperature of an object using a handheld thermometer through an infrared thermal imaging device. However, there may be significant errors in accuracy. In addition, the operational requirements for inspection personnel and the high time ratio for fixed-point temperature measurement make it more difficult to accurately record the temperature measurement.

Unable to monitor in real-time

The infrared thermometer mainly uses a manual inspection mode. Only when personnel walk near the monitored equipment during inspection can the temperature information inside the switchgear be obtained through the infrared thermal imaging device.

High voltage switchgear generally operates 24 hours a day without interruption, and infrared monitoring devices are unable to implement monitoring, resulting in delayed online temperature monitoring information and inability to achieve real-time online temperature monitoring. The stable operation of English high-voltage cabinets depends on the temperature measurement time and frequency of manual inspections, and cannot guarantee the implementation of temperature rise standards for switchgear.

High cost

The price of infrared thermal imaging thermometers is usually high, especially for the F brand imported from abroad. If multiple infrared temperature measuring devices are used for fixed monitoring, there will be a huge economic cost budget. In order to ensure temperature monitoring of the equipment, the frequency of manual inspections can only be continuously increased, which in turn increases the cost of human operation. Therefore, for high-voltage switchgear that is in long-term operation, the limitation of infrared thermometers is mainly that they cannot achieve real-time online temperature measurement and truly effective monitoring, so they cannot meet the temperature monitoring needs of high-voltage switchgear.

Advantages of wireless temperature measurement system

The wireless temperature measurement system can be divided into battery powered and CT induction powered based on the different power supply methods inside the wireless terminal. Battery powered wireless temperature measurement systems are widely used, and their performance characteristics are as follows:

Advantages of wireless temperature measurement system for switchgear

Real time monitoring

The wireless temperature measurement system for switchgear can achieve real-time online monitoring of multi-point temperatures in high-voltage switchgear, meeting the needs of customers for real-time monitoring of the operating status of high-voltage cabinets and can be used as a temperature alarm system for uploading information.

Diverse methods

The wireless temperature measurement system can display the internal temperature values of each switchgear, and can be networked for multiple monitoring. It can also be combined with the monitoring and display systems in the factory to meet the intelligent networking and flexible monitoring requirements of 5G time.

Disadvantages of wireless temperature measurement system for switchgear

Low accuracy

Wireless temperature measurement hosts are usually much larger in size than infrared thermometers and cannot be installed on the contacts of the switchgear. They can only be installed near the copper bars of the switchgear. Because copper has good thermal conductivity, but with the increase of temperature measurement distance, the copper bar dissipates heat quickly, causing the accuracy of the wireless temperature measurement device in the switchgear to increase due to the increase of distance.

Low stability

Wireless temperature measurement terminals for switchgear are usually installed in high voltage and strong electromagnetic areas. Although many switchgear wireless temperature measurement manufacturers use high shielding structures, the internal temperature measurement host is easily affected by electromagnetic interference from switchgear equipment, resulting in low stability of the wireless temperature measurement system.

Large maintenance volume and low safety factor

The wireless temperature measurement terminal is powered by batteries. When the battery is depleted, it needs to be replaced, and customers need to regularly maintain the temperature measurement system. After the operation of the high-voltage switchgear, it is generally difficult to maintain the temperature measurement system during power outage, except for regular maintenance needs. When the battery is depleted and cannot be replaced in a timely manner, the wireless temperature measurement system is actually in a stopped temperature measurement state, and internal temperature information cannot be obtained, and the temperature rise standard of the high-voltage cabinet cannot be controlled. Because the battery of the wireless temperature measurement system itself has the possibility of explosion in high voltage environments, it also poses a certain challenge to the safe operation of the switchgear. The installation location of the wireless temperature measurement system is relatively far from the hot spot, the hardware circuit cannot be guaranteed, and various electromagnetic interference cannot be eliminated in actual use. It has the characteristics of large maintenance and low safety. The wireless temperature measurement system is also not suitable for temperature monitoring of the contact points of high-voltage switchgear.

Point type fluorescent fiber optic temperature measurement system for high-voltage switchgear

FJINNO’s independently developed point type fluorescent fiber optic temperature measurement system has significant advantages over other temperature measurement devices in terms of safety, accuracy, reliability, stability, and other indicators. It is a suitable choice for temperature monitoring of high-voltage switchgear and is designed completely in accordance with the temperature rise standards of high-voltage cabinets, meeting the comprehensive needs of customers for intelligent networking, real-time online monitoring, and centralized monitoring.

Advantages of Point Fluorescent Fiber Temperature Measurement System

Good safety

The fluorescent fiber optic point type fiber optic temperature measurement system adopts a special fiber optic sheath with insulating material, which is resistant to high temperature and corrosion, and is not easy to adhere to other substances. It can meet the use of high-voltage, high-temperature, and strong electromagnetic environments in switchgear.

High stability

The transmission process of optical fibers is not affected by electromagnetic interference. In addition, the system itself adopts the fiber optic temperature measurement technology based on the principle of fluorescence fiber lifetime, and uses self-developed temperature measurement transmitters, which greatly improves the reliability of the system.

High precision

The fluorescent fiber optic sensor probe has a small size and can be directly installed on the temperature rise hot spot of the high-voltage cabinet. The time from sensing temperature changes to displaying the screen is short, and the accuracy is within ± 1 ℃, which is much higher than other domestic company brands of temperature measurement devices.

Real time online temperature monitoring

The fluorescence fiber optic temperature measurement system continuously monitors the temperature changes of the switchgear online, ensuring that the high-voltage equipment is in a monitored state at all times and is completely unaffected by environmental and human factors.

Seamless system integration

Supports internationally recognized Modbus protocol: can exchange data with most integrated monitoring systems;

Supports IEC61850 protocol: can seamlessly connect with customer systems; There are various communication interfaces available for customers to choose from, such as RS-485.

Flexible networking
It can work on a single machine or connect multiple machines to the network, facilitating centralized temperature monitoring and management in intelligent systems.




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