Problems faced by traditional temperature measurement
Conventional temperature measurement method
Conventional thermocouple, thermal resistance, semiconductor temperature sensor, etc., requires metal wire transmission signal, and insulation can not be guaranteed.
2. Comparison with optical fiber temperature measurement
The fiber temperature sensor uses the optical fiber transmission temperature signal, and the optical fiber has excellent insulating properties, which can be separated from the high pressure in the gate cabinet, so the optical fiber temperature sensor can be directly mounted to the high pressure contacts in the switchgear, accurately measuring the operation
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of high pressure contacts. Temperature, realizing online monitoring of the operating temperature of the switchgear contact operation. However, the fiber has a characteristic of volatile, easy to break, no high temperature resistance. After accumulating dust, it is easy to discharge the fiber along the surface to reduce the insulating property, and is affected by the structural structure of the switchgear, and the difficulty in the cabinet is large. In addition, the cost of fiber temperature measurement is relatively high.
3. Infrared temperature measurement
Infrared temperature is non-contact temperature measurement, volatile environment and electromagnetic field interference, and the space in the switchgear is very narrow, and the infrared temperature detecting probe cannot be installed (because the probe must maintain a certain safe distance with the object to be measured, and need The surface of the object to be measured is required to be measured, and there is no obstruction in the field of view, and the surface is clean to ensure accuracy.
4. Active wireless temperature measurement
Active wireless temperature sensor size is usually relatively large and often replaces the battery, and the system maintenance cost is high. At the same time, the battery is not suitable for working in high temperature, particularly at a working environment above 150 degrees Celsius.
Advantages of passive wireless temperature measurement
No battery
The SAW sensor adopts passive sensing, no battery-driven, reducing the maintenance costs of battery replacement, and does not affect the ecological environment.
2. Safe and reliable
Wireless temperature sampling methods do not need to be connected on the measured point or related support structure, no electrical contact between the sensor and the receiving device, thereby achieving high pressure isolation, ensuring safe operation of the equipment.
3. Installation is convenient and flexible
The passive wireless temperature sensor is small in size and is wirelessly transmitted between the reader, and the installation is convenient and flexible, not affected by the structural and space of the switchgear.
4. Environmental adaptability
The temperature sensor has compensated the deviation during the sensor production after the correction of the matching software. The sensor can be commissioned in any operating temperature range and will not be affected by the seasonal factor. Typically, the sensor is only commissioned once after installation and maintains no need to correct for many years.
At the same time, environmental factors such as dust accumulation do not affect the temperature measurement of SAW sensor.
5. High cost performance
The passive wireless work mode is greatly reduced to the installation and maintenance cost of the system.