What are the differences between fiber optic temperature measurement, infrared temperature measurement, and wireless temperature measurement

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The application of temperature sensor temperature measurement system

With the increasing number of power equipment nowadays, many switchgear devices have also gained different importance in our lives. Most substation equipment requires electrical connections, such as substations, nuclear power equipment in power plants, high and low voltage transmission substations, high-speed rail transit, subway traction transformer temperature measurement, itd. The accessories for electrical connection mainly include cable joints, copper busbar, incoming and outgoing lines. The main function of electrical connection is to combine different lines, and the connection points where different lines are connected are called electrical power connection points. Međutim, connection points are particularly prone to temperature rise, which can cause power equipment to heat up and cause faults or even fires and explosions. Without a corresponding monitoring system, there will be significant safety hazards. Stoga, temperature monitoring of electrical connection points is necessary. In addition to manual inspection, using temperature sensors to monitor electrical equipment is a common practice. Temperature sensors refer to sensors that can sense temperature, convert it into usable output signals, and display them on the control panel for linkage. Temperature sensor temperature measurement methods can be divided into two categories: contact and non-contact. According to material classification and electronic component characteristics, they are divided into two types: resistance temperature sensors and thermocouple temperature sensors.

Principle of infrared temperature measurement method

The main method is to receive the infrared signal emitted by the measured object through an infrared temperature sensor, and then amplify and process the output signal through infrared equipment. Without the installation of any optical system, infrared temperature sensors have a relatively short temperature measurement distance, making it difficult to monitor the temperature of equipment installed at high altitudes in some substations and in some flammable and explosive hazardous situations. If you want to increase the temperature measurement distance, optical equipment such as lenses, reflectors, field mirrors, eyepieces, itd. must be installed, which is relatively complex, and the price of infrared thermometers is high after installation.

Disadvantages of infrared thermometers

The temperature difference of the infrared induction temperature measurement device is relatively large, mainly because there is a temperature difference of several degrees when the infrared thermometer is powered on and started for temperature measurement. Stoga, the infrared thermal imaging device can only be used in situations where precise temperature measurement is not required. If an infrared thermometer is needed to accurately measure the temperature of the object being measured, a black body needs to be placed at the temperature measurement location of the infrared thermal imager as a reference temperature value. The price of an external black body can range from several thousand to tens of thousands, making the temperature measurement cost even higher. Osim toga, the blackbody must be at a certain distance from the infrared thermal imager, so the temperature measurement device needs to be divided into two parts, so there is also a certain degree of complexity in the use process. As a non-contact temperature measurement device, infrared high-temperature detection instruments can usually be used in microwave heating equipment. Međutim, vacuum heating equipment may produce dust, liquids, and other chemical pollutants during the production process, which may stick to the surface of the infrared thermometer, causing inaccurate temperature measurement.

Comparison between wireless temperature measurement and fiber optic temperature measurement

The advantages of fiber optic temperature sensors

Fiber optic temperature sensors are mainly distributed and fiber optic fluorescence temperature sensors. Using optical fiber to transmit temperature signals, the optical fiber has good insulation performance and is not affected by high voltage inside the switchgear. The optical fiber temperature sensor can be directly installed on the high voltage contacts inside the switchgear, accurately measuring the working temperature of the high voltage contacts and completing online monitoring of the working temperature of the switchgear contacts. Specially designed for real-time online temperature monitoring and overheating warning of high-voltage equipment, it uses optical fiber for high-voltage isolation and signal transmission, utilizing the inherent insulation and electromagnetic field interference resistance of optical fiber. The optical fiber temperature sensor is installed on the surface of the tested target, such as the contact points, bus contacts, and power cable joints in the high-voltage switchgear, and can accurately and quickly measure the surface temperature. The measured data is transmitted to the temperature measurement instrument host through optical fiber Fiber optic can be arranged reasonably according to the internal structure of high-voltage equipment, without affecting the operation of the original equipment. The fiber optic thermometer is installed on the cabinet panel or other suitable positions, and it will display the temperature values of each measured point on the LCD screen. U isto vrijeme, it will monitor whether the temperature exceeds the limit. When the temperature exceeds the limit, an alarm signal will be output

The characteristics of wireless temperature measurement systems

The wireless temperature measurement system uses electromagnetic wave transmission signals, and the sensors are directly installed on high-voltage equipment. The temperature measurement is accurate and can also handle electrical insulation issues.
Features of wireless temperature measurement system: Specially designed for monitoring the operating temperature of high-voltage charged bodies, using wireless radio frequency transmission signals to achieve non-contact temperature measurement. The sensor is installed on the high-voltage equipment and has no electrical connection with the receiving device’s thermometer. It has high voltage isolation performance, fundamentally solving the problem of difficult monitoring of the operating temperature of high-voltage equipment contacts. It has high reliability and safety, allowing the wireless temperature sensor to be installed on each high-voltage switch and bus joint. The wireless temperature sensor is installed on the surface of the high-voltage equipment, collects its temperature, and transmits the data to the wireless thermometer through a 2.4G wireless network. The wireless thermometer displays the received data on the LCD screen and monitors whether the temperature exceeds the limit. When the temperature exceeds the limit, Afterwards, output an alarm signal