How to use smart temperature monitoring for power grid equipment-INNO

In the power system of the grid, grid equipment is an indispensable part. To ensure the normal operation of grid equipment, grid monitoring personnel are needed to measure and record the real-time status of the grid. Theo thống kê, various electrical equipment failures in transmission lines are closely related to their heating. Hiện tại, intelligent temperature measurement devices for power grid equipment mostly use peripheral power supplies, which are connected to the power supply through lines. Tuy nhiên, the lines will age over time, and monitoring personnel also need to pay attention to the use of peripheral circuits to prevent power outages and inability to work caused by the aging of the lines of the intelligent temperature measurement devices for power grid equipment. Hơn thế nữa, the high installation height of the power grid poses certain difficulties for the installation of intelligent temperature measurement devices for power grid equipment. Due to the limited measurement range, multiple sets of devices need to be used in conjunction to ensure the accuracy of measurement data. Sometimes even drones are needed to assist in temperature measurement, which increases the difficulty and cost of temperature measurement.

Temperature measurement scheme for power grid

There are several temperature measurement methods in the power grid, and FJINO will introduce several common temperature measurement schemes below.

1. Thermocouple resistance temperature measurement

The disadvantage of using conventional devices such as thermocouples, nhiệt điện trở, and semiconductor temperature sensors to detect grid junction temperature is that it cannot be wirelessly passive, requires metal wires to transmit signals, cannot work independently wirelessly, and insulation performance cannot be guaranteed.

2. Infrared temperature measurement method. Infrared temperature measurement is a non-contact temperature measurement method that is widely used in temperature detection of equipment such as substation sleeves, thiết bị chống sét, và thanh cái. Its disadvantage is that the accuracy of indirectly obtaining temperature data through infrared spectra cannot meet the requirements. The level of computer recognition technology for infrared spectra cannot replace manual recognition, and the degree of automation is not high, so it is not widely used. Nhược điểm: It requires manual labor, đo nhiệt độ không tiếp xúc, and cannot be detected beyond the line of sight, resulting in low temperature measurement accuracy.

3. Đo nhiệt độ không dây phương pháp. Việc sử dụng đo nhiệt độ không dây devices to detect the temperature of power grid contacts requires regular battery replacement, and the working temperature of wireless communication modules is limited.

4. Đo nhiệt độ sợi quang

The use of optical fibers to transmit temperature signals has the characteristics of insulation, chống nhiễu, và điện trở cao. Fluorescence fiber temperature measurement technology has absolute advantages in these fields because it has no additional heating caused by conductive parts and is not affected by electromagnetic fields.

Application fields of power grid fiber optic temperature measurement:

1. Distributed fiber optic temperature measurement in cable tunnels

A device composed of a temperature measurement control host, a temperature measurement optical cable, vân vân., that monitors the temperature of the power cable body, phụ kiện, and the environment. Việc phân phối hệ thống giám sát nhiệt độ sợi quang uses laser pulses to enter from one end of the fiber optic cable for temperature measurement. During the forward propagation process, the fiber optic molecules interact with each other and undergo various types of scattering. Trong số đó, due to the thermal vibration of the fiber optic molecules, a light longer than the wavelength of the light source and a light shorter than the wavelength of the light source are generated. The intensity of the shorter wavelength light is more sensitive to temperature. The temperature information of any point in the optical waveguide can be obtained from the ratio of the intensity of the two long and short wavelength light signals at that point. The principle of optical time domain reflectometry (OTDR) is used to locate these hotspots by the transmission speed of light waves in the optical fiber and the time of the backscattered light. By utilizing the above technical principles, distributed measurement of the temperature field along the optical fiber can be achieved.

2. Đo nhiệt độ sợi quang huỳnh quang cho thiết bị đóng cắt

The temperature detection of heating elements such as switchgear contacts, knife switches, thanh cái thanh cái, and incoming and outgoing lines can be used inside the switchgear.

Fluorescent fiber optic temperature sensors have obvious advantages such as anti electromagnetic interference ability, ổn định tốt, độ nhạy cao, thu nhỏ, trọng lượng nhẹ, và đo nhiệt độ tiếp xúc. Vì thế, fluorescent fiber optic temperature sensors are used for online monitoring of electrical equipment switchgear.

3. Transformer winding temperature measurement

Dry type transformer three-phase winding temperature measurement, Đo nhiệt độ sợi huỳnh quang cuộn dây máy biến áp ngâm trong dầu. Việc ứng dụng công nghệ đo nhiệt độ sợi quang trong giám sát nhiệt độ điểm nóng cuộn dây máy biến áp có ưu điểm là tiện lợi., sự chính xác, sự an toàn, và độ tin cậy. Nó có thể phát hiện kịp thời và chính xác các khuyết tật và những nguy hiểm tiềm ẩn như cuộn dây quá nóng, Điều này có ý nghĩa rất lớn trong việc cải thiện hoạt động an toàn và ổn định của máy biến áp.

4. Vận chuyển đường sắt

Không thể sử dụng phép đo nhiệt độ PT100 truyền thống khi vận chuyển bằng đường sắt vì nhiễu điện từ mạnh được tạo ra khi tàu điện ngầm đi qua, và chỉ có thể sử dụng phép đo nhiệt độ sợi quang huỳnh quang. Nó có thể được sử dụng trên các thiết bị công suất lớn như máy biến áp chính và máy biến áp chỉnh lưu. các hệ thống đo nhiệt độ sợi quang đã được sử dụng rộng rãi trong các tuyến tàu điện ngầm nội địa như Line 1. Please feel free to contact us for a one-stop solution for track temperature measurement and customer cases.