CN205049257U - High tension switchgear's temperature monitoring system - Google Patents

Abstract

A temperature monitoring system for a high-voltage switchgear, including a T-shaped antenna, a feeder, a control cabinet, and at least one surface acoustic wave temperature sensor; the surface acoustic wave temperature sensor is fixed on a contact in the high-voltage switchgear, and is suitable for receiving When the first radio frequency signal is received, the second radio frequency signal is transmitted, and the second radio frequency signal is related to the temperature of the contact; the T-shaped antenna is adsorbed on the inner surface of the cabinet wall of the high-voltage switch cabinet, and is suitable for transmitting the first radio frequency signal , and receive the second radio frequency signal; one end of the feeder is connected to the T-shaped antenna through the cabinet wall of the high-voltage switch cabinet, and the other end of the feeder is connected to the control cabinet; the control cabinet is arranged on The top of the high voltage switchgear is suitable for displaying the contact temperature according to the second radio frequency signal. The temperature monitoring system of the high-voltage switchgear provided by the utility model does not need complex wiring and is not disturbed by the strong magnetic field in the high-voltage switchgear.

Description

Temperature Monitoring System for High Voltage Switchgear

technical field

The utility model relates to the technical field of on-line monitoring of electric power systems, in particular to a temperature monitoring system of a high-voltage switch cabinet.

Background technique

High-voltage switchgear refers to electrical products used for on-off, control or protection in power system power generation, transmission, distribution, power conversion and consumption. During long-term operation, the switch contacts and busbar connections of the high-voltage switchgear will heat up due to aging or excessive contact resistance. If the temperature of these heating parts continues to rise, it will cause fire accidents and cause large-scale power outages. Therefore, it is necessary to monitor the temperature of the high-voltage switchgear on-line to realize timely early warning, timely maintenance and improve power supply reliability. In the prior art, the following methods are often used to monitor the temperature of the high-voltage switchgear:

1. Use thermocouples, thermal resistors, semiconductor temperature sensors, etc. for temperature measurement, which require metal wires to transmit signals, and the insulation performance cannot be guaranteed;

2. The temperature measurement method of optical fiber temperature sensor is adopted. This method uses optical fiber to transmit temperature signals. The optical fiber is easily broken and not resistant to high temperature. After accumulating dust, it is easy to cause the optical fiber to discharge along the surface, thereby reducing the insulation performance, and it is affected by the structure of the switchgear. Wiring in the cabinet is difficult and costly;

3. The non-contact temperature measurement method of infrared temperature measurement is susceptible to the interference of the environment and the surrounding electromagnetic field, and the space in the switch cabinet is very small, and it is impossible to install an infrared temperature measurement probe. It is required that the measured point can be within the field of vision. Covered, and the surface is clean to ensure the accuracy of the measurement results.

To sum up, the temperature measurement methods that have been applied to high-voltage switchgear have problems such as complicated wiring, susceptibility to magnetic field interference, and difficult maintenance.

Utility model content

What the utility model aims to solve is the problem that the existing high-voltage switchgear has complex wiring in the temperature measurement mode, is easily disturbed by the magnetic field, and is difficult to maintain.

In order to solve the above problems, the utility model provides a temperature monitoring system for a high-voltage switchgear, including a T-shaped antenna, a feeder, a control cabinet and at least one surface acoustic wave temperature sensor; the surface acoustic wave temperature sensor is fixed in the high-voltage switchgear On the contact, it is suitable for transmitting a second radio frequency signal when receiving the first radio frequency signal, and the second radio frequency signal is related to the temperature of the contact; the T-shaped antenna is adsorbed on the inner surface of the cabinet wall of the high voltage switch cabinet, It is suitable for transmitting the first radio frequency signal and receiving the second radio frequency signal; one end of the feeder is connected to the T-shaped antenna through the cabinet wall of the high voltage switch cabinet, and the other end of the feeder is connected to the control Chassis connection; the control chassis is arranged on the top of the high-voltage switch cabinet, and is suitable for displaying the contact temperature according to the second radio frequency signal. The surface acoustic wave temperature sensor is small in size and is directly fixed on the contact in the high-voltage switchgear to realize real-time temperature monitoring, and transmits temperature information with the T-shaped antenna through radio frequency signals, which is convenient and flexible for installation and is not affected by the structure and space of the high-voltage switchgear. It is not affected by the electromagnetic field interference in the high-voltage switchgear. Furthermore, the control cabinet is arranged on the top of the high-voltage switch cabinet, and the cabinet door on the top of the high-voltage switch cabinet can be opened without power failure, which is convenient for management personnel to operate.

Optionally, the surface acoustic wave temperature sensor is fixed on the contact in the high voltage switch cabinet by screws.

Optionally, the control chassis includes a temperature acquisition module, a controller, a display module, an input module, and an alarm indicator light; the temperature acquisition module is adapted to generate the first radio frequency signal when receiving a temperature acquisition instruction, and The second radio frequency signal is converted into a digital temperature signal; the controller is adapted to generate the temperature acquisition instruction, and control the display module, the input module and the alarm indicator light to work according to the digital temperature signal; The display module is suitable for displaying the contact temperature; the input module is suitable for receiving user setting information; and the alarm indicator light is suitable for emitting light to give an alarm when the contact temperature does not meet the preset requirements.

Optionally, the display module is a liquid crystal display.

Optionally, the input module is a membrane button or a touch screen.

Optionally, the distance between the T-shaped antenna and the surface acoustic wave temperature sensor is less than 165 centimeters. Setting the distance between the T-shaped antenna and the surface acoustic wave temperature sensor within this range can ensure that the T-shaped antenna receives effective radio frequency signals.

Optionally, the number of the surface acoustic wave temperature sensors is at least two, and the distance between every two surface acoustic wave temperature sensors is greater than 20 centimeters. As the distance between every two surface acoustic wave temperature sensors is relatively close, the signal waveforms will be superimposed, resulting in signal attenuation and affecting the final test results, so the distance between every two surface acoustic wave temperature sensors is set to be greater than 20 Centimeters can improve the accuracy of test results.

Optionally, the distance between the surface acoustic wave temperature sensor and the cabinet wall of the high voltage switch cabinet is greater than 10 cm. When the cabinet wall of the high-voltage switch cabinet is close to the surface acoustic wave temperature sensor, it will interfere with the transmission of radio frequency signals by the surface acoustic wave temperature sensor. Setting the distance between the surface acoustic wave temperature sensor and the cabinet wall of the high voltage switch cabinet to be greater than 10 cm can effectively reduce the interference of the cabinet wall of the high voltage switch cabinet to the surface acoustic wave temperature sensor.

Compared with the prior art, the utility model has the following advantages:

The temperature monitoring system of the high-voltage switchgear provided by the utility model can monitor the temperature change of the contacts in the high-voltage switchgear in real time and give an alarm when the contact temperature does not meet the preset requirements. Since the surface acoustic wave temperature sensor is used to collect the contact temperature, the surface acoustic wave temperature sensor is small in size, so it does not require complicated wiring and is not interfered by the strong magnetic field in the high-voltage switch cabinet. The temperature monitoring system operates stably, the measurement error can be controlled within ±0.5°C, and it has strong scalability.

Description of drawings

Fig. 1 is the structural representation of the temperature monitoring system of the high voltage switchgear of the utility model embodiment;

Fig. 2 is a schematic structural diagram of the control cabinet of the embodiment of the present invention.

detailed description

The utility model will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

1 is a schematic structural diagram of a temperature monitoring system for a high-voltage switchgear according to an embodiment of the present invention. The temperature monitoring system for a high-voltage switchgear includes a T-shaped antenna 11, a feeder 12, a control cabinet 13, and at least one surface acoustic wave temperature sensor. Since each surface acoustic wave temperature sensor has the same structure and function, in this embodiment, the surface acoustic wave temperature sensor 10 is taken as an example for illustration.

The surface acoustic wave temperature sensor 10 is fixed on the contact 15 in the high voltage switch cabinet 14, and is adapted to emit a second radio frequency signal when receiving the first radio frequency signal, and the second radio frequency signal is related to the temperature of the contact. The velocity of the surface acoustic wave will change with the change of external environmental factors. The surface acoustic wave temperature sensor 10 uses this characteristic of the surface acoustic wave to convert the variation of the contact temperature into the frequency deviation of the second radio frequency signal. displacement. In this embodiment, the surface acoustic wave temperature sensor 10 is fixed on the contact 15 in the high voltage switch cabinet 14 by screws. In other embodiments, the surface acoustic wave temperature sensor 10 may also be fixed on the contact 15 in the high voltage switch cabinet 14 by other methods such as gluing, which is not limited in the present invention. In order to accurately and comprehensively monitor the temperature in the high-voltage switchgear 14, the number of surface acoustic wave temperature sensors can be increased. For example, a surface acoustic wave temperature sensor may be provided on each moving contact and each static contact. In this embodiment, the distance between the surface acoustic wave temperature sensor 10 and the cabinet wall of the high voltage switch cabinet 14 is greater than 10 cm, and the distance between every two surface acoustic wave temperature sensors is greater than 20 cm.

The T-shaped antenna 11 is adsorbed on the inner surface of the cabinet wall of the high voltage switch cabinet 14, and is suitable for transmitting the first radio frequency signal and receiving the second radio frequency signal. In this embodiment, the distance between the T-shaped antenna 11 and the surface acoustic wave temperature sensor 10 is less than 165 cm. One end of the feeder 12 passes through the cabinet wall of the high voltage switch cabinet 14 and is connected to the T-shaped antenna 11 , and the other end of the feeder 12 is connected to the control cabinet 13 . The control cabinet 13 is arranged on the top of the high voltage switch cabinet 14 and is suitable for generating the first radio frequency signal and displaying the contact temperature according to the second radio frequency signal. By arranging the control cabinet 13 on the top of the high-voltage switch cabinet 14, that is, installing the control cabinet 13 in the small busbar room on the top of the high-voltage switch cabinet, the cabinet door on the top of the high-voltage switch cabinet 14 can be opened without power failure, which is convenient for management personnel to operate.

2 is a schematic structural view of the control cabinet 13 of the embodiment of the present invention, the control cabinet 13 includes a temperature acquisition module 21 , a controller 22 , a display module 23 , an input module 24 and an alarm indicator light 25 .

The temperature acquisition module 21 is adapted to generate the first radio frequency signal when receiving a temperature acquisition instruction, and convert the second radio frequency signal into a digital temperature signal. The controller 22 is connected with the temperature acquisition module 21, the display module 23, the input module 24 and the alarm indicator light 25, and is adapted to generate the temperature acquisition instruction, and control the temperature according to the digital temperature signal. The display module 23, the input module 24 and the alarm indicator light 25 work. Both the controller 22 and the temperature acquisition module 21 can be existing integrated circuits, for example, the controller 22 can be a TMS320F2812 integrated circuit. Further, the controller 22 can be connected with the temperature acquisition module 21 through the RS232 serial interface, and communicate with the host computer through the RS485 serial interface. The display module 23 can be a liquid crystal display, which is suitable for displaying the temperature of the contact. The display module 23 can directly display the contact temperature in digital form in real time, and can also display the change trend of the contact temperature in the form of a curve. The input module 24 can be a membrane button or a touch screen, which is suitable for receiving user setting information. For example, the user can set the temperature measurement cycle, perform temperature calibration, set the maximum temperature threshold, and set the temperature difference threshold through the input module 24 . The alarm indicator light 25 is suitable for giving a light alarm when the temperature of the contact does not meet the preset requirements. The preset requirement can be that the temperature of the contact is lower than the maximum temperature threshold, or can be the temperature difference between the two collected contacts before and after. below the temperature difference threshold.

Below in conjunction with Fig. 1 and Fig. 2, the working principle of the temperature monitoring system of the high-voltage switchgear of the embodiment of the present invention is described: after the user sets the parameters through the input module 24, the controller 22 sends the temperature acquisition module 21 Send a temperature acquisition instruction, the temperature acquisition module 21 transmits a first radio frequency signal to the surface acoustic wave temperature sensor 10 through the T-shaped antenna 11; after the surface acoustic wave temperature sensor 10 receives the first radio frequency signal , converting the offset of the contact temperature into the variation of the resonant frequency, and transmitting a second radio frequency signal to the T-shaped antenna 11; the temperature acquisition module 21 converts the second radio frequency signal carrying temperature information into a digital temperature signal , and transmit the digital temperature signal to the controller 22; the controller 22 processes the digital temperature signal, controls the display module 23 to display the contact temperature, and when the contact temperature does not meet the preset When required, control the warning indicator light 25 to emit light and give an alarm. In addition, the controller 22 can also send the contact temperature to the host computer through the RS485 serial interface, which is convenient for managers to read the measured contact temperature on the host computer.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any simple modification or equivalent change made to the above embodiments according to the technical essence of the utility model falls within the scope of the present utility model. Within the protection scope of the present utility model.

Claims (8)

1. A temperature monitoring system of a high-voltage switchgear, characterized in that, comprises a T-shaped antenna, a feeder, a control cabinet and at least one surface acoustic wave temperature sensor; The surface acoustic wave temperature sensor is fixed on the contact in the high-voltage switch cabinet, and is suitable for transmitting a second radio frequency signal when receiving the first radio frequency signal, and the second radio frequency signal is related to the temperature of the contact; The T-shaped antenna is adsorbed on the inner surface of the cabinet wall of the high-voltage switch cabinet, and is suitable for transmitting the first radio frequency signal and receiving the second radio frequency signal; One end of the feeder is connected to the T-shaped antenna through the cabinet wall of the high-voltage switch cabinet, and the other end of the feeder is connected to the control cabinet; The control cabinet is arranged on the top of the high-voltage switch cabinet and is suitable for displaying the contact temperature according to the second radio frequency signal. 2. The temperature monitoring system of the high-voltage switchgear according to claim 1, wherein the surface acoustic wave temperature sensor is fixed on the contact in the high-voltage switchgear by screws. 3. The temperature monitoring system of the high-voltage switch cabinet according to claim 1, wherein the control cabinet includes a temperature acquisition module, a controller, a display module, an input module and an alarm indicator light; The temperature acquisition module is adapted to generate the first radio frequency signal when receiving a temperature acquisition instruction, and convert the second radio frequency signal into a digital temperature signal; The controller is adapted to generate the temperature acquisition instruction, and control the display module, the input module and the alarm indicator light to work according to the digital temperature signal; The display module is adapted to display the contact temperature; The input module is adapted to receive user setting information; The alarm indicator light is suitable for giving a light alarm when the temperature of the contact does not meet the preset requirement. 4. The temperature monitoring system of the high-voltage switchgear according to claim 3, wherein the display module is a liquid crystal display. 5. The temperature monitoring system of the high-voltage switchgear according to claim 3, wherein the input module is a membrane button or a touch screen. 6. The temperature monitoring system of the high voltage switchgear according to claim 1, characterized in that the distance between the T-shaped antenna and the surface acoustic wave temperature sensor is less than 165 cm. 7. The temperature monitoring system of the high-voltage switchgear according to claim 1, wherein the number of the surface acoustic wave temperature sensors is at least two, and the distance between every two surface acoustic wave temperature sensors is greater than 20 cm . 8. The temperature monitoring system of the high-voltage switchgear according to claim 1, wherein the distance between the surface acoustic wave temperature sensor and the cabinet wall of the high-voltage switchgear is greater than 10 centimeters.