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How to measure the temperature of circuit breakers? The best and safest temperature monitoring system for circuit breakers is fluorescent fiber optic

Fiber optic temperature measurement for circuit breakers

What are the effects of circuit breaker temperature rise and the reasons for high voltage circuit breaker temperature rise

A circuit breaker is a key component of electrical equipment, usually installed in a metal enclosed switchgear. During operation, the actual operating status of the circuit breaker cannot be observed. If the coordination between the switchgear and the circuit breaker is poor, it is easy to overheat the contact parts during operation, causing a decrease in the insulation performance of the switchgear insulation parts, and subsequently causing electrical safety accidents such as phase to phase or ground short circuits inside the switchgear. High voltage circuit breakers, especially those used in central cabinets, have a rated voltage of 10-35kV. They can control designated lines or power equipment to exit or put into operation according to the needs of power grid operation, playing a control role; On the other hand, once the system malfunctions, it can promptly cut off the fault point, ensuring the safe operation of the fault free part of the power grid and playing a protective role. In short, the circuit breaker can open, close, and carry operating and short-circuit currents. If they fail during operation, it can cause a power outage in one line or small area, or a chain reaction of system accidents, resulting in incalculable losses. Therefore, circuit breakers and their operational reliability are directly related to the safe operation and power supply quality of the entire power system, playing a very important role in the power system,

Online temperature measurement technology for circuit breakers

At present, the temperature sensors of online temperature measurement circuit breaker technology on the market are all electronic products, and the temperature sensors need a power supply to work. The ways to obtain the power supply include batteries, induction power supply, etc. The sensors of this type of product are at risk of unstable quality, battery explosion, and low insulation strength during actual operation. At the same time, its signal transmission adopts wireless signal transmission method. In the metal enclosed electrical equipment space, wireless transmission method has limitations in electromagnetic interference and shielding, and signal stability is poor. Electronic products still have the characteristics of low measurement accuracy and low lifespan in actual operation. Based on these shortcomings, the current online temperature measurement circuit breakers are difficult to apply on a large scale in the market. The temperature rise of circuit breakers is a major factor affecting their reliability and lifespan. Currently, various electrical accidents in the distribution field are mainly caused by high temperatures inside the circuit breakers. Firstly, the switchgear operates with electricity, and the circuit breaker is enclosed inside the switchgear. If it operates with electricity for a long time, the heat generated cannot be discharged in a timely manner. If the temperature is too high for a long time, it can cause various electrical accidents; Secondly, poor contact between the moving and stationary contacts inside the circuit breaker, long-term operation of high current, high voltage, and aging of the contacts can lead to increased contact resistance, resulting in prolonged heating. This can easily lead to circuit breaker tripping and power outage, and even cause damage to the switchgear; Finally, there are resistive components and rectifier bridges on the circuit board of the circuit breaker. When the switchgear is operated for a long time, the closing and locking circuit and energy storage circuit are always live, and the resistive components and rectifier bridge generate heat during long-term operation. As a result, the resistance and rectifier bridge will age or burn directly, and the circuit board cannot function properly. Without the circuit board, the circuit breaker cannot function properly, leading to power outages. At the same time, the existing temperature measurement systems only focus on monitoring platforms for processing detection data, without considering the acquisition of detection information by mobile terminals. It is necessary for monitoring platform personnel to communicate the information to the personnel holding mobile terminals, resulting in the inability to transmit information in a timely manner and low efficiency.

Online temperature monitoring device for fluorescent fiber optic temperature measurement system of circuit breaker contact arm contact

The fluorescent fiber optic temperature measurement system uses fluorescent fiber optic to transmit temperature information, solving the problem of high and low voltage isolation. It can monitor the health status information of circuit breakers online and provide a very important means for early detection of isolation switch faults. The purpose is to overcome the shortcomings of traditional temperature measurement technology. fiber optic temperature measurement host provides an online temperature measurement type circuit breaker and its fiber optic temperature measurement scheme that can achieve temperature detection in the high-voltage area of the circuit breaker, with strong stability, good reliability, and high safety.

The reasons for the temperature increase of circuit breakers in high-voltage switchgear

The temperature measurement of high-voltage switchgear mainly measures the comprehensive temperature inside the cabinet, which to a large extent wastes equipment resources; After long-term observation and testing, it was found that the temperature inside the high-voltage switchgear is mainly caused by poor contact between the dynamic and static contacts of the high-voltage circuit breaker, long-term operation of high current, high voltage, and aging of the contacts, which leads to an increase in contact resistance, resulting in long-term heating, high contact temperature, and even causing accidents such as burning of the switchgear. So, comprehensive temperature measurement plays a role to a certain extent, but relatively speaking, the invested resources and returns cannot be directly proportional, wasting equipment resources.

Fuzhou Innovation Electronic Scie&Tech Co., Ltd.  provides a fluorescent fiber optic online temperature measurement system for high-voltage circuit breakers in high-voltage switchgear, which can monitor the contact temperature of high-voltage circuit breakers inside the switchgear in a targeted and real-time manner, reduce equipment investment, and ensure the normal operation of the high-voltage switchgear.

Fluorescent fiber optic online temperature measurement system for circuit breakers

The fluorescent fiber optic online temperature measurement system for circuit breakers includes low voltage and high voltage areas. The low voltage area is equipped with an optical signal demodulator, and the high voltage area is equipped with a temperature sensor for measuring the temperature of the conductive arm of the circuit breaker. The temperature sensor and the optical signal demodulator are connected through optical fibers, and the optical signal demodulator is connected to the external display or alarm device of the circuit breaker.

The fluorescent fiber optic temperature sensor collects the contact temperature of the high-voltage circuit breaker inside the high-voltage switchgear. The collected signal is modulated and sent to the microprocessor, which saves and displays it. According to the set safety temperature value, the buzzer or voice alarm module is activated to achieve real-time monitoring. At the same time, the staff is promptly reminded to cool down the circuit breaker to ensure the normal operation of the high-voltage switchgear.

Customer users can measure the temperature of the circuit breaker by setting up a fluorescent fiber optic temperature sensor host system, upload the measurement results to the controller, and the controller will determine whether the temperature exceeds the set value. Then, based on the judgment results, the cooling device will be controlled and the temperature situation will be sent to the backend monitoring system and mobile terminal. The fluorescence fiber optic temperature measurement system can not only effectively monitor the temperature of the circuit breaker, but also timely upload the monitoring results to the background monitoring system and mobile terminals, enabling monitoring personnel to grasp the temperature monitoring situation of the circuit breaker anytime and anywhere. Simultaneously adjust the temperature of the circuit breaker through a cooling device.

Circuit breaker fluorescent fiber optic online temperature measurement host

The fluorescence online temperature monitoring system for circuit breakers mainly includes: fiber optic temperature sensors, microprocessor circuits, display circuits, keyboard circuits, alarm circuits, power circuits, communication interface circuits, etc.

The fiber optic monitoring and temperature measurement system for circuit breakers is mainly in contact with the dynamic and static contacts of the tested parts of the circuit breaker, as well as the circuit board. The collected temperature information is transmitted to the fiber optic temperature measurement host, which communicates with the backend monitoring system; And the fiber optic temperature measurement host can be equipped with functions such as over temperature alarm and over high temperature trip. When the temperature collected by the fiber optic sensor exceeds the set temperature, for example, when the set temperature is set to 60 ° C, the fiber optic temperature measurement host will send out an over temperature alarm signal. At the same time, the fan will be started to cool down and dissipate the heat inside the circuit breaker;

If the temperature continues to rise sharply at this time and the collected temperature exceeds another set temperature, such as 85 ° C, the fiber optic temperature measurement host will have an ultra-high temperature trip signal transmitted, and the circuit breaker will be controlled to trip at the same time;

At this time, whether controlling fan cooling or ultra-high temperature tripping signals, they are uploaded to the background monitoring system, which can achieve monitoring anytime and anywhere.

Why do circuit breakers use fiber optic temperature measurement hosts for temperature measurement

The fiber optic temperature measurement host can obtain or monitor the temperature of the high-voltage area of the circuit breaker through real-time monitoring. When the temperature is too high, the staff can inspect the circuit breaker to effectively prevent overheating of the contact parts during the operation of the circuit breaker, which may cause a decrease in the insulation performance of the insulation components of the switchgear. This can then lead to electrical safety accidents such as inter phase or ground short circuits inside the switchgear, improving the reliability of the circuit breaker’s operation. At the same time,  fiber optic temperature measurement host has stable product quality, high temperature measurement accuracy, high safety, and long service life. The material of the optical fiber is quartz, which has good insulation and chemical stability; There are no interference or shielding issues with signal transmission. Its product quality is stable, with high measurement accuracy, high safety, and a service life of over 30 years.

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