Temperature on-line monitoring system for high-voltage side joint of high-power plant transformer

Abstract

The invention discloses an online temperature monitoring system for a high-voltage side joint of a high-power plant transformer, and belongs to the technical field of power equipment monitoring. The system comprises a temperature measuring probe, a data transmission unit, a data processing and storage unit and a display unit. And the temperature measuring probe is arranged at a connecting flange of the high-voltage bushing of the high-voltage plant transformer and the isolated-phase enclosed bus and is used for acquiring a temperature signal of a connecting bolt. The temperature measuring probe is an online thermal infrared imager, and is directly aligned with an overheating risk point by forming a hole in a specific position of a high-voltage side shell of the high-voltage plant transformer and performing sealed installation; the data transmission unit transmits the temperature signal to a data processing and storage unit in the local control cabinet through a cable, and the data processing and storage unit is integrated with a hard disk video recorder and is used for storing temperature video data; the display unit is used for displaying temperature monitoring pictures in real time. Real-time, visual and non-contact monitoring of the temperature of a traditional blind spot area is achieved, the structure is simple, installation is convenient and fast, the overheating defect can be effectively early warned, and safe operation of a generator set is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of power equipment condition monitoring technology, specifically to an online temperature monitoring system for the connection between the high-voltage side of the transformer and the isolated phase busbar in a thermal power plant. Background Technology

[0002] High-voltage transformers (HVDC transformers) are key equipment in the power system of thermal power plants. Their high-voltage side is connected to the main transformer or generator outlet via a phase-separated enclosed busbar. During long-term operation, the bolted joints at this connection may overheat due to increased contact resistance, vibration, or other reasons. In severe cases, this may lead to arcing short-circuit accidents, threatening the safety of the unit.

[0003] Currently, conventional temperature monitoring methods (such as applying temperature-indicating wax strips and periodic inspections with handheld infrared thermometers) suffer from drawbacks such as lag and inability to provide real-time online monitoring. Existing online temperature monitoring devices (such as fiber optic temperature measurement and wireless temperature measurement) are often installed outside the transformer body or busbar casing. For the high-voltage side bushing and enclosed busbar connection flange of the high-voltage transformer, which is internal, sealed, and at a high potential, direct and effective temperature monitoring is difficult to achieve. Article 6.6 of the national standard "Metal Enclosed Busbars" (GB / T 8349-2000) requires that temperature monitoring devices be installed at busbar joints and other easily overheated areas. However, how to economically and reliably implement this requirement at the specific location of the high-voltage side of the high-voltage transformer is a problem that urgently needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a monitoring system that is simple in structure, reliable in installation, and capable of real-time online monitoring of the temperature at the high-voltage side connection of a high-voltage transformer.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An online temperature monitoring system for the high-voltage side connection of a high-voltage transformer, comprising: The temperature probe is installed at the connection flange between the high-voltage bushing of the high-voltage transformer and the isolated phase busbar to collect the temperature signal at the connection point. A data processing and storage unit, connected to the temperature probe signal, is used to receive, process, and store the temperature signal; The display unit, connected to the data processing and storage unit, is used to display temperature monitoring information; The temperature probe is an online infrared thermal imager, which is sealed and fixed through a mounting hole on the high-voltage side of the transformer housing, with the lens facing the bolt area of ​​the connecting flange.

[0006] The aforementioned online temperature monitoring system for the high-voltage side connection of a high-voltage transformer includes a data processing and storage unit that is a network hard disk video recorder, located in a local control cabinet near the high-voltage transformer.

[0007] The aforementioned online temperature monitoring system for the high-voltage side connection of a high-voltage transformer further includes a data transmission unit comprising a switch, an optical fiber transceiver, and a flame-retardant optical cable, used to remotely transmit the signal from the temperature probe to the network hard disk recorder.

[0008] The aforementioned online temperature monitoring system for the high-voltage side connection of a high-voltage transformer includes a display unit that is a monitoring monitor and is located in a remote control room or inspection station.

[0009] The aforementioned online temperature monitoring system for the high-voltage side connection of a high-voltage transformer further includes a matrix device for receiving signals from multiple temperature probes and managing their switching. Beneficial effects

[0010] 1. This invention solves the long-standing problem of the inability to effectively monitor the connecting bolts most prone to overheating by installing an infrared thermal imager at a specific location on the high-voltage side of the transformer.

[0011] 2. The system of this invention operates continuously 24 / 7, and can detect temperature anomalies in real time and trigger alarms, upgrading accident prevention from "periodic inspection" to "real-time monitoring", which greatly improves safety.

[0012] 3. This invention uses mature industrial monitoring equipment (infrared thermal imager, NVR, fiber optic transmission) in combination, making the system stable and reliable, easy to install and maintain, and with low modification costs.

[0013] 4. This invention provides intuitive thermal imaging images and stores historical temperature data, which facilitates judgment and post-event analysis by operators and is in line with the construction trend of intelligent power plants. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the system structure of the present invention. Detailed Implementation

[0015] Reference Figure 1 An online temperature monitoring system for the high-voltage side connection of a high-voltage transformer, comprising: The temperature probe is installed at the connection flange between the high-voltage bushing of the high-voltage transformer and the isolated phase busbar to collect the temperature signal at the connection point. A data processing and storage unit, connected to the temperature probe signal, is used to receive, process, and store the temperature signal; The display unit, connected to the data processing and storage unit, is used to display temperature monitoring information; The temperature probe is an online infrared thermal imager, which is sealed and fixed through a mounting hole on the high-voltage side of the transformer housing, with the lens facing the bolt area of ​​the connecting flange.

[0016] The data processing and storage unit is a network hard disk video recorder, which is located in a local control cabinet near the high-voltage transformer.

[0017] The system also includes a data transmission unit, which includes a switch, a fiber optic transceiver, and a flame-retardant optical cable, for remotely transmitting the signal from the temperature probe to the network hard disk recorder.

[0018] The display unit is a monitoring monitor, which is installed in a remote control room or inspection station.

[0019] The system also includes a matrix device for receiving signals from multiple temperature probes and managing their switching.

[0020] The temperature probe is preferably an online infrared thermal imager. It is installed and fixed by precisely drilling holes in the high-voltage side casing of the high-voltage transformer (or the transition box connected to the enclosed busbar) and using a sealed structure, so that its lens can be directly and unobstructed aimed at the connection flange and bolt area between the high-voltage bushing and the phase-separated enclosed busbar. This installation method realizes non-contact direct temperature measurement of traditional monitoring blind spots.

[0021] The data processing and storage unit is preferably an industrial-grade network video recorder (NVR), installed in a local control cabinet near the transformer. It receives video stream data from the temperature probe through a data transmission unit (which may include a switch, fiber optic transceiver, and flame-retardant optical cable), and performs real-time processing, analysis, alarm functions, and cyclic storage.

[0022] The display unit is a monitoring display that can be installed in the power plant's central control room or maintenance team to display temperature thermal images, temperature values, and over-temperature alarm information in real time, enabling remote visual inspection.

Claims

1. An online temperature monitoring system for the high-voltage side connection of a high-voltage transformer, characterized in that: Its components include: The temperature probe is installed at the connection flange between the high-voltage bushing of the high-voltage transformer and the isolated phase busbar to collect the temperature signal at the connection point. A data processing and storage unit, connected to the temperature probe signal, is used to receive, process, and store the temperature signal; The display unit, connected to the data processing and storage unit, is used to display temperature monitoring information; The temperature probe is an online infrared thermal imager, which is sealed and fixed through a mounting hole on the high-voltage side of the transformer housing, with the lens facing the bolt area of ​​the connecting flange.

2. The online temperature monitoring system for the high-voltage side connection of a high-voltage substation according to claim 1, characterized in that: The data processing and storage unit is a network hard disk video recorder, which is located in a local control cabinet near the high-voltage transformer.

3. The online temperature monitoring system for the high-voltage side connection of a high-voltage substation according to claim 2, characterized in that: The system also includes a data transmission unit, which includes a switch, a fiber optic transceiver, and a flame-retardant optical cable, for remotely transmitting the signal from the temperature probe to the network hard disk recorder.

4. The online temperature monitoring system for the high-voltage side connection of a high-voltage transformer as described in claim 1, characterized in that: The display unit is a monitoring monitor, which is installed in a remote control room or inspection station.

5. The online temperature monitoring system for the high-voltage side connection of a high-voltage transformer as described in claim 1, characterized in that: The system also includes a matrix device for receiving signals from multiple temperature probes and managing their switching.

Images