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What are the types of temperature monitoring sensors for power distribution equipment

Why do power distribution equipment need temperature measurement

The design and installation of temperature measurement products in distribution cabinets have been applied for many years, which is a relatively normal practice. As we all know, temperature measurement is necessary in many distribution systems. Especially with the widely promoted concept of unmanned distribution rooms, installing temperature measuring products to prevent electrical accidents is even more important.

2. Whether it is high, medium, or low voltage cabinet equipment, the operating load is relatively high, the current is high, and there are many hot spots, which require the installation of temperature measurement products.

3. Fluorescent fiber technology has a certain threshold, and there are not many high-tech enterprises in China that can truly independently develop it. Only FJINNO is a technology leading enterprise, and the manufacturers we cooperate with are often able to win bids. We have standard specifications, complete technical parameters, and reliable quality brands to ensure that customers can choose the products they want.

4. The production of fluorescent fiber optic temperature measuring probes is a high-tech enterprise, and the products guarantee the quality of high-tech, so the product quality is guaranteed.

5. After years of competition, wireless temperature measurement products have low prices for each point. The vicious competition caused by homogenization has led to a decrease in product quality and transparent market prices. This is why designers and bidding parties are not willing to use wireless temperature measurement products now.

The concept of “wireless” in wireless temperature measurement products is simply that there is no wire between the wireless temperature measurement probe and the demodulator, while after the demodulator, it is all wired. And all wireless temperature measurement products have active temperature measurement probes. Compared to the device failure rate during the active power supply process and the reduced safety factor of the electrical system caused by the installation of active probes, the one-time installation of passive fluorescent fiber temperature measurement probes provides accurate temperature measurement, reliable transmission, and can truly achieve maintenance free for more than 10 years. The advantages are very obvious.

Fiber optic temperature measurement system technology is a contact measurement method. Due to its good insulation performance, high voltage resistance, strong magnetic field resistance, high current resistance, corrosion resistance, electromagnetic interference resistance, long-distance transmission, and no interference, fiber optic has gradually become the first choice for temperature monitoring in strong electromagnetic environments. The main manifestations are the following fiber optic temperature measurement system technology solutions:

1. Distributed temperature measurement system: By utilizing the nonlinear Raman effect in optical fibers, temperature information can be detected along the fiber direction. It has the concept of spatial resolution.

2. Fiber Bragg Grating Temperature Measurement System: Using ultraviolet light to write gratings into optical fibers, utilizing the principle that the wavelength of the grating changes due to temperature modulation, temperature information is obtained by analyzing the wavelength change information.

3. Fluorescence temperature measurement system: Fluorescent substance is coated at the end of the optical fiber, and after being excited by a certain wavelength of light, the fluorescent substance is stimulated to emit fluorescence energy. Due to the exponential decay of stimulated radiation energy, the time constant of decay varies depending on temperature. By measuring the decay time, the temperature of the measurement point can be obtained. This method is for fiber optic single point temperature measurement. By utilizing the principle that the afterglow time of rare earth special fluorescent substances is related to temperature, temperature information can be obtained through afterglow time. This technology has been verified to be applicable for monitoring the winding temperature of ultra-high voltage (750KV) transformers. The sensor has a small size, high long-term reliability, moderate price, and can not only achieve single-sided cabinet configuration, but also build a temperature monitoring system. The construction and debugging process is convenient and fast.

Comparison of advantages and disadvantages of several common temperature measurement methods on power equipment

1. Infrared thermal imaging temperature measurement

Poor accuracy, greatly affected by the environment, and easily affected by the environment; Unable to measure the temperature inside the switchgear; Unable to bypass optical obstruction; Lack of data processing capability, high cost, and high operating costs.

2. Wireless temperature measurement system

Poor accuracy and susceptibility to electromagnetic and temperature interference; Data transmission is prone to errors and loss; Reduced the voltage level and safety characteristics of the original equipment;

3. Fiber Bragg Grating Temperature Measurement System

High precision, unaffected by environmental factors, and expensive in price;

4. Fluorescence temperature measurement system

High precision, not affected by environmental factors, can be configured as a single cabinet, providing matching equipment for switchgear; It can independently form a network and provide convenient and fast construction and debugging processes for temperature monitoring systems.

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