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The characteristics of wireless temperature measurement and fiber optic temperature measurement in switchgear

The necessity of temperature measurement in switchgear

It is an important device in the power system and widely used in various industries. The switchgear or distribution cabinet is a general term for the motor control center, which is the final level equipment of the distribution system; The distribution cabinet is used in situations with concentrated loads and multiple circuits, responsible for distributing the electrical energy of a certain circuit of the higher-level distribution equipment to the nearest load. The temperature of the switchgear is high during use, and the electrical components operating in high-temperature environments are prone to leakage and self ignition. Therefore, it is necessary to measure the temperature of the switchgear, as the temperature of the electrical components inside the cabinet needs to be monitored during use to avoid safety accidents caused by high temperatures. Due to issues such as poor contact of the contacts and overcurrent of the load, the temperature of the contacts in the switchgear can be too high, causing damage to the contacts and resulting in power outages. Therefore, it is necessary to monitor the temperature of the contacts in real time, and when it exceeds the threshold, an alarm can be triggered for timely maintenance and handling.

How many types of temperature measurement for switchgear

The commonly used methods currently include using infrared thermometers for regular inspections or using online monitoring equipment for real-time monitoring, as there may be issues with missed inspections and untimely detection during regular inspections. Therefore, online monitoring is currently commonly used. Online monitoring mainly uses fiber optic temperature measurement, infrared probes, wireless temperature sensors and other online measurements.

 

Wireless temperature measurement for switchgear

At present, temperature measurement methods for power plants, substations, high-voltage lines, high-voltage electrical appliances, wind turbine bearings, distribution cabinets, passenger trains, glass processing, tobacco processing and other equipment and places with strict temperature range requirements and relatively dangerous measurement environments mainly include manual measurement and wired measurement. The drawbacks and shortcomings of these methods are: firstly, manual measurement poses great risks because the equipment and places being measured are high voltage, high-altitude, and difficult to access, which can easily cause harm to measurement personnel. The wireless temperature measurement system includes a wireless temperature measurement terminal, a wireless temperature measurement management machine, and a on-site computer. The wireless temperature measurement terminal converts the measured temperature parameters into wireless signals and transmits them to the wireless temperature measurement management machine. The wireless temperature measurement management machine transmits the temperature parameters to the on-site computer through Ethernet.

Fiber optic temperature measurement for switchgear

The fiber optic temperature measurement system for switchgear is a fluorescence fiber optic temperature measurement device developed by FJINNO, which is applied to high-voltage switchgear. It has a long service life and is resistant to electromagnetic interference. It can provide effective protection for temperature monitoring of high-voltage switchgear and other equipment in substations, judge the equipment’s ability and service life, and provide scientific basis for safe operation of equipment. Adopting internationally advanced fluorescent fiber optic temperature sensing technology, it has the advantages of high voltage resistance, no electromagnetic interference, long-term reliability, and easy expansion. It is used for real-time online monitoring of the temperature of monitoring points such as generators, high-voltage switchgear, ring main cabinets, outdoor and underground cable joints in power generation and supply systems.

Mainly for real-time online monitoring of abnormal temperature changes in the dynamic and static contacts, busbars, switches, and other contacts of power switchgear in substations. With this system, users can monitor the temperature changes in the monitored parts of the switchgear in real time on both local and remote upper computers, and issue real-time alarm reports (warnings, alarms, and exceeding limits) based on the temperature changes. At the same time, with the help of powerful upper computer functions, it is possible to analyze the temperature change cycle, view real-time and historical curves, predict changes in alarm situations, and achieve remote data exchange among multiple users. The system consists of fluorescent fiber optic (including sensing head), fiber optic temperature transmitter, fluorescent fiber optic communication software, system meter head, etc.

The fluorescence fiber optic online temperature measurement system is mainly designed for real-time online monitoring of parts that are prone to high temperature during long-term operation of switchgear and transformers (upper and lower contacts and joints of switchgear; transformer windings, iron cores, etc.), to avoid unnecessary losses caused by high temperature due to heavy loads.

The fluorescence fiber optic online temperature measurement system mainly includes: optical path system, photoelectric conversion system, data acquisition and processing system, and data display and output equipment. The light from the light source is transmitted to an external sensor through a light splitter. The sensor reflects back light of a specific wavelength, which is then transmitted to the photoelectric conversion system through the light splitter. The photoelectric detector converts the wavelength signal into an electrical signal, collects the electrical signal from the photoelectric detector, processes it, and converts the electrical signal into a digital signal. Transfer to the data display output device through a network or serial port.

Functional characteristics of fiber optic temperature measurement system for switchgear

Security: Compared to traditional sensors, fiber optic temperature sensors have high temperature resistance, passivity, and are not affected by strong electric and magnetic fields.

Real time: Real time uninterrupted online monitoring ensures that equipment is in a monitored state at all times, and safety is not affected by human factors, minimizing the probability of accidents that may be caused by personnel negligence.

Progressiveness: The fluorescent optical fiber online temperature measurement system collects data through the sensor wavelength shift, which is a digital measurement, avoiding the problem that traditional sensors are vulnerable to interference factors such as power fluctuations, transmission line losses, etc.

Accuracy: Digital measurement technology ensures temperature measurement accuracy and repeatability, with a temperature measurement accuracy of level 1 and a temperature resolution of 0.1 ℃. It also has the characteristic of fast response speed, which can fully meet the needs of power system safety.

Stability: The temperature sensor is only sensitive to temperature and is not affected by factors such as vibration, impact, displacement, humidity, etc. The system is stable and reliable.

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