Device for online monitoring temperature of contact of substation equipment

Abstract

The invention provides a device for online monitoring the temperature of a contact of substation equipment, and belongs to the technical field of devices for monitoring the temperature of the substation equipment. In order to solve technical problems, the invention provides a device for conveniently monitoring the temperature of the contact of the substation equipment. According to the technical scheme, the device comprises a cross-district monitoring master station computer, monitoring center computers, bus gateways, temperature collectors and passive wireless temperature sensors. The cross-district monitoring master station computer is installed in a cross-district monitoring master station, the monitoring center computers are installed in a substation monitoring center, the bus gateways are installed in a distribution room, the temperature collectors are installed on a switch cabinet, and the passive wireless temperature sensors are installed on the surface of a monitored element. The cross-district monitoring master station computer is connected with the multiple monitoring center computers which are connected with the multiple bus gateways, the bus gateways are connected with the multiple temperature collectors through communication buses, and the temperature collectors are connected with the multiple passive wireless temperature sensors through a wireless radio frequency network. The device is suitable for power supply departments.

Description

technical field [0001] The invention relates to an online monitoring device for contact temperature of substation equipment, belonging to the technical field of temperature monitoring devices for substation equipment. Background technique [0002] Power grid safety production is not only a huge and complex system engineering, but also the basis for the reform, development and stability of power companies and the whole society. It is the top priority for the development of smart grids in my country and the world in the future. In a series of important documents such as the "National Medium and Long-Term Science and Technology Development Plan" and the "State Grid Corporation Green Development White Paper" issued by the State Grid on April 19, the security of the smart grid has been included in the national major priority development and implementation. theme. [0003] During the long-term operation of each equipment in the substation, the contacts of the switch and the bus con...

AI Technical Summary

Problems solved by technology

[0006] 1. Conventional temperature measurement methods: The disadvantages of conventional thermocouples, thermal resistances, semiconductor temperature sensors and other temperature measurement methods are that they cannot be wireless and passive, and metal wires are required to transmit signals. They cannot work independently wirelessly, and insulation performance cannot be guaranteed. Even if wireless transmission is used The module, in the complex situation of the magnetic field, electric field and thermal field of the power grid, has weak anti-interference ability and cannot work normally

[0007] 2. Optical fiber temperature measurement: The optical fiber temperature sensor uses optical fiber to transmit temperature signals. The optical fiber has excellent insulation performance and can isolate the high voltage in the switch cabinet. Therefore, the optical fiber temperature sensor can be directly installed on the high voltage contact in the switch cabinet, accurate Measure the operating temperature of the high-voltage contacts to realize online monitoring of the operating temperature of the switch cabinet contacts. However, the optical fiber is easy to break, easy to break, and not resistant to high temperatures. After accumulating dust, it is easy to cause the optical fiber to discharge along the surface and reduce the insulation. The optical fiber It belongs to the wired method, which will destroy the existing equipment structure. Due to the influence of the structure of the switch cabinet, it is difficult to wire in the cabinet. In addition, the cost of optical fiber temperature measurement is relatively high

[0008] 3. Infrared temperature measurement: Infrared temperature measurement is non-contact temperature measurement, which is widely used in temperature monitoring of substation bushings, arresters, busbars and other equipment. However, due to the complex internal structure of high-voltage switchgear, the components are more shielded from each other. Through The accuracy of the temperature data obtained indirectly by the infrared spectrum cannot meet the requirements, and the computer recognition technology level of the infrared spectrum cannot replace manual identification, and the degree of automation is not high. The temperature is easily disturbed by the environment and the surrounding electromagnetic field. Because the space in the switch cabinet is very narrow, it is impossible to install an infrared temperature measurement probe (because the probe must keep a certain safe distance from the measured object and need to face the surface of the measured object), It is required that the point to be measured can be unobstructed in the field of view, and the surface is clean to ensure accuracy. Therefore, when using the infrared imager to measure the temperature, there will be dead angles, which cannot be fully monitored; the infrared imager must be measured by the staff. It is impossible to realize remote and real-time monitoring, which wastes a lot of manpower; when monitoring outdoor knife gates, etc., due to the long distance and high cost, the equipment will fail to monitor when encountering ice and snow weather.

[0009] 4. Active wireless temperature measurement: Active wireless temperature sensors are usually relatively large in size and need to be replaced frequently. The maintenance cost of the system is high. At the same time, the battery is not suitable for working in a high temperature state. If the temperature is too high, it will affect the normal operation of the battery. , will eventually affect the measurement accuracy, and even false alarms will occur; in addition, when the battery power is insufficient, false alarms will occur, which will affect the monitoring accuracy; in addition, most of the antennas used by wireless sensors are ordinary sucker antennas. Due to its shape, it cannot be installed in the handcart cabinet when it is used for contact temperature monitoring in the switch cabinet

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