GIS bus contact temperature rise live detection device and method

Abstract

The invention provides a GIS bus contact temperature rise live-line detection device and method. The device integrates an excitation light source, a light splitting device, an optical fiber, a temperature measurement belt containing a fluorescent optical fiber temperature measurement probe, a photoelectric conversion unit, a signal detection and processing unit and a display screen. According to the device, contact temperature measurement is utilized, a fluorescence optical fiber temperature measurement probe is excited through laser, a measurement signal is sent out according to the temperature of a cylinder near a GIS bus contact, and a temperature array of the cylinder near the contact is finally displayed on a display screen in real time through photoelectric conversion and signal detection and processing. The device is compact in design, efficient and accurate temperature monitoring is achieved, and the safety and reliability of power grid operation are improved.

Description

Technical Field

[0001] The present application belongs to the field of GIS busbar contact temperature rise monitoring, and in particular, relates to a GIS busbar contact temperature rise live detection device and method. Background Art

[0002] In the power system, gas-insulated metal-enclosed switchgear (GIS) is a key equipment for high-voltage power transmission and distribution. Its operating stability and safety are directly related to the reliable operation of the entire power grid. As an important component connecting different electrical equipment, GIS busbar contacts will generate a lot of heat during operation. If the temperature exceeds the safe range, it will not only affect the insulation performance of the equipment, but may also cause serious accidents such as short circuits and fires. Therefore, real-time and accurate temperature monitoring of GIS busbar contacts is of great significance for preventing faults and ensuring the safety of the power grid.

[0003] Traditional GIS busbar contact temperature monitoring methods mostly use contact temperature sensors, such as thermocouples or thermal resistors. Although these methods can directly measure the contact temperature, they have the disadvantages of complex installation, affecting the insulation performance of the equipment, and being difficult to install and maintain under power. In addition, since the GIS equipment is filled with high-voltage insulating gas and has a compact structure, it is particularly difficult to directly perform contact measurement on the busbar contacts. Summary of the invention

[0004] The purpose of the present application is to overcome the defects in the above-mentioned prior art and to provide a device and method for detecting the temperature rise of GIS busbar contacts.

[0005] The present application provides a GIS busbar contact temperature rise live detection device, comprising: an excitation light source, a spectrometer, an optical fiber, a temperature measuring tape, a photoelectric conversion module, a signal detection circuit, a signal processing unit and a display screen;

[0006] The excitation light source is sequentially connected to the light splitting device, the optical fiber, and the temperature measuring tape;

[0007] The optical splitting device is also connected in sequence to the photoelectric conversion module, the signal detection circuit, the signal processing unit, and the display screen;

[0008] The temperature measuring belt comprises a fluorescent optical fiber temperature measuring probe and a thermal insulation film, and a plurality of the fluorescent optical fiber temperature measuring probes are arranged in a preset manner on the inner surface of the thermal insulation film to form the temperature measuring belt;

[0009] The temperature measuring tape is used to surround and fix on the outside of the cylinder where the GIS busbar contact is located;

[0010] The laser light emitted by the excitation light source passes through the light splitting device and the optical fiber in sequence and reaches the temperature measuring zone;

[0011] After receiving the excitation of the laser, the fluorescent optical fiber temperature measuring probe on the temperature measuring belt sends out a measurement signal according to the temperature of the GIS busbar contact;

[0012] The photoelectric conversion module converts the measurement signal into an electrical signal which then passes through a signal detection circuit and a signal processing unit in sequence;

[0013] The signal processing unit generates a temperature signal according to the electrical signal and displays it on the display screen.

[0014] Optionally, the signal processing unit generates a temperature signal according to the electrical signal and displays it on the display screen, including: generating a temperature distribution feature according to the temperature signals corresponding to the plurality of fluorescent optical fiber temperature measuring probes;

[0015] The temperature distribution characteristics were recorded every 30 seconds.

[0016] Optionally, it also includes: a temperature threshold setting module, which is used to preset a safe temperature threshold of the GIS busbar contact and compare the threshold with the temperature signal generated by the signal processing unit. When the temperature signal exceeds the preset threshold, a warning signal is issued through the display screen.

[0017] Optionally, the light splitting device comprises:

[0018] Tunable filter, used to adjust the wavelength of laser to match the optimal excitation wavelength of different fluorescent fiber optic temperature measurement probes.

[0019] Optionally, the temperature measuring belt further comprises a reinforcing frame;

[0020] The reinforcing frame is embedded in the thermal insulation film to enhance the structural strength of the temperature measuring belt.

[0021] Optionally, it also includes: a remote communication module, which is used to transmit the temperature signal generated by the signal processing unit to a remote monitoring center via wireless communication.

[0022] Optionally, the excitation light source is a pulsed laser source.

[0023] The present application also provides a method for detecting the temperature rise of a GIS busbar contact under electrical conditions, comprising:

[0024] Using an excitation light source to generate laser light;

[0025] The laser is transmitted to the temperature measuring zone through the light splitting device and the optical fiber in sequence;

[0026] In the temperature measuring zone, the laser excites the fluorescent optical fiber temperature measuring probe, and the fluorescent optical fiber temperature measuring probe sends a corresponding measurement signal according to the temperature of the GIS busbar contact;

[0027] Transmitting the measurement signal to a photoelectric conversion module, where the photoelectric conversion module converts the measurement signal into an electrical signal;

[0028] The electrical signal is sequentially detected and amplified by the signal detection circuit, and then transmitted to the signal processing unit;

[0029] The signal processing unit processes the electrical signal to generate a temperature signal;

[0030] Transmit the temperature signal to the display screen for display.

[0031] Optionally, the light splitting device comprises:

[0032] Tunable filter, used to adjust the wavelength of laser to match the optimal excitation wavelength of different fluorescent fiber optic temperature measurement probes.

[0033] Optionally, the temperature measuring belt further comprises a reinforcing frame;

[0034] The reinforcing frame is embedded in the thermal insulation film to enhance the structural strength of the temperature measuring belt.

[0035] The beneficial effects of this application are:

[0036] The present application provides a GIS busbar contact temperature rise live detection device, comprising: an excitation light source, a spectrometer, an optical fiber, a temperature measuring tape, a photoelectric conversion module, a signal detection circuit, a signal processing unit and a display screen; the excitation light source is sequentially connected to the spectrometer, the optical fiber and the temperature measuring tape; the spectrometer is also sequentially connected to the photoelectric conversion module, the signal detection circuit, the signal processing unit and the display screen; the temperature measuring tape comprises a fluorescent optical fiber temperature measuring probe and a thermal insulation film, and a plurality of the fluorescent optical fiber temperature measuring probes are arranged in an array in a preset manner on the inner surface of the thermal insulation film to form the temperature measuring tape; the temperature measuring tape is used to surround and be fixed on the outside of the cylinder where the GIS busbar contact is located; the laser emitted by the excitation light source passes through the spectrometer and the optical fiber in sequence to reach the temperature measuring tape; after receiving the excitation of the laser, the fluorescent optical fiber temperature measuring probe on the temperature measuring tape sends a measurement signal according to the temperature of the GIS busbar contact; the photoelectric conversion module converts the measurement signal into an electrical signal and then passes through the signal detection circuit and the signal processing unit in sequence; the signal processing unit generates a temperature signal according to the electrical signal and displays it on the display screen. This application uses non-contact temperature measurement technology and integrates an efficient signal processing and display system to achieve real-time and accurate monitoring of GIS busbar contact temperature, thereby improving the safety and reliability of power grid operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the GIS busbar contact temperature rise live detection device in this application;

[0038] Figure 2 This is a schematic diagram of the fluorescent optical fiber temperature measurement belt in this application;

[0039] Figure 3 This is a schematic diagram of the contact temperature rise array distribution characteristics in this application;

[0040] Figure 4 This is a schematic diagram of the external temperature rise temperature array distribution characteristics in this application;

[0041] Figure 5 Schematic diagram of the GIS busbar contact temperature rise live detection method in this application. DETAILED DESCRIPTION

[0042] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that various forms of implementing the present disclosure should not be limited by the embodiments set forth herein. On the contrary, the embodiments are provided to more thoroughly understand the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0043] When the temperature of the GIS contact rises, the heat will be transferred to the cylinder through thermal convection in the sulfur hexafluoride gas. According to current research results, the heat generated by the temperature rise of the contact will be concentrated just above the contact and transferred to the cylinder just above.

[0044] Without considering the heat exchange between the cylinder and the environment, the heat flux rising from the contact will form a circular temperature distribution field directly above it.

[0045] However, most GIS busbars are installed outdoors and are affected by sunlight for a long time, especially at noon. The sunlight will make the temperature of the sun-facing side of the cylinder significantly higher than other sides (the measured maximum temperature of the sun-facing side reaches 53°C). At this time, the temperature rise brought to the cylinder by sunlight is significantly greater than the temperature rise brought to the cylinder by the heat flow rising from the contacts. That is, the characteristics of the contact temperature rise reflected on the outer surface of the cylinder will be submerged by the light temperature rise. Therefore, accurately distinguishing the sunlight temperature rise (external temperature rise) and the contact temperature rise (internal temperature rise) is the biggest difficulty in conducting on-site contact temperature rise live detection.

[0046] Please refer to Figure 1 As shown, the present application provides a GIS bus contact temperature rise and live detection device, including: an excitation light source 101, a spectrometer 102, an optical fiber 103, a temperature measuring tape, a photoelectric conversion module 105, a signal detection module 106, a signal processing module 107 and a display screen 108.

[0047] The excitation light source 101 is sequentially connected to the spectroscopic device 102 , the optical fiber 103 , and the temperature measuring tape; the spectroscopic device 102 is also sequentially connected to the photoelectric conversion module 105 , the signal detection module 106 , the signal processing module 107 , and the display screen 108 .

[0048] The excitation light source 101 is used to generate laser light of a specific wavelength as excitation light for the temperature measurement of the fluorescent optical fiber 103 .

[0049] The temperature measurement of the fluorescent optical fiber 103 belongs to the contact temperature measurement method. This method realizes temperature measurement based on measuring the length of the fluorescence afterglow life. After the fluorescent material applied to the distant temperature measuring end is stimulated by light of a specific wavelength, it will radiate corresponding fluorescence energy. After the light excitation of the specific wavelength is cancelled, the fluorescence afterglow begins to decay. The duration of the fluorescence afterglow depends on the fluorescent material located on the temperature measuring probe 104, that is, the temperature of the material to be measured. The choice of specific wavelength light excitation is matched with the selected fluorescent material, and the most effective excitation light wavelength of different fluorescent materials is different. When selecting, it is important to consider choosing the light wavelength that is most suitable for exciting the fluorescent material. Usually the attenuation curve of the light-excited fluorescent material is in the form of a single exponential:

[0050]

[0051] Where I(t) is the fluorescence signal intensity; I0 is the fluorescence signal intensity excited at t=0; τ is the fluorescence lifetime; and B is the sum of various interferences.

[0052] It can be seen from the above formula that there is a monotonic relationship between fluorescence lifetime and temperature, and the temperature can be measured by measuring the fluorescence lifetime.

[0053] The spectrometer 102 includes an excitation light spectrometer 102 and an emission light spectrometer 102. The excitation light spectrometer 102 is responsible for splitting the laser light emitted by the excitation light source 101 to obtain the excitation light of a specific wavelength suitable for the temperature measuring probe 104 of the fluorescent optical fiber 103; the emission light spectrometer 102 is used to split the fluorescence emitted by the temperature measuring probe 104 of the fluorescent optical fiber 103 for subsequent photoelectric conversion and signal processing.

[0054] The optical fiber 103 connects the spectrometer 102 and the temperature measuring belt, transmits the excitation light to the fluorescent optical fiber 103 temperature measuring probe 104, and transmits the fluorescent signal back to the spectrometer 102. Preferably, in the present application, the excitation light reaches the front end of the fluorescent optical fiber 103 sensor via 400 optical fibers 103 and irradiates the fluorescent substance.

[0055] The temperature measuring belt is composed of a fluorescent optical fiber 103, a temperature measuring probe 104 and a heat-insulating film. The heat-insulating film is made of high-quality material and has good heat-insulating performance to prevent the external environment from affecting the temperature measurement accuracy.

[0056] like Figure 2 As shown, the outer diameter of the GIS busbar cylinder is about 400-600mm, and the outer circumference is 1256-1884mm. Considering the redundancy during field use, fluorescent optical fiber 103 temperature measuring probes 104 are installed on the inner surface of the thermal insulation film in a 40×10 array to form a rectangular temperature measuring belt (2000mm long and 300mm wide) to adapt to the outer diameter of the GIS busbar cylinder.

[0057] When in use, wrap the rectangular temperature measuring tape around the outside of the cylinder where the contacts are located and tie it securely so that each probe is in close contact with the outer wall of the cylinder.

[0058] The photoelectric conversion module 105 converts the received fluorescent signal into an electrical signal.

[0059] The signal detection module 106 performs preliminary detection and processing on the electrical signal output by the photoelectric conversion module 105 .

[0060] The signal processing module 107 further processes the electrical signal output by the signal detection module 106, obtains corresponding temperature information by calculating the fluorescence afterglow lifetime, and determines the source of temperature rise (contact temperature rise or external temperature rise) according to the temperature distribution characteristics.

[0061] The display screen 108 displays the temperature information corresponding to each temperature measuring probe 104 generated by the signal processing module 107 and the temperature rise type determined by the system.

[0062] Specifically, the designed temperature measuring tape is wrapped around the outside of the cylinder where the GIS busbar contact is located, and tied firmly to ensure that each fluorescent optical fiber 103 temperature measuring probe 104 is in close contact with the outer wall of the cylinder. Turn on the excitation light source 101, and the laser reaches the fluorescent optical fiber 103 temperature measuring probe 104 on the temperature measuring tape through the light splitting device 102 and the optical fiber 103. Under the excitation of the laser, the fluorescent optical fiber 103 temperature measuring probe 104 emits a corresponding fluorescent signal according to the temperature of the GIS busbar contact.

[0063] The fluorescence signal is returned to the spectroscopic device 102 through the optical fiber 103, converted into an electrical signal by the photoelectric conversion module 105, and then processed by the signal detection module 106 and the signal processing module 107, and finally the temperature information of each probe is obtained.

[0064] The temperature information of each probe is displayed in real time on the display screen 108, and the initial temperature distribution characteristics are recorded. Wait for about 10 minutes, and record the temperature distribution characteristics every 30 seconds to reduce the impact of sunlight on the cylinder. According to the temperature characteristics presented by the probe array during the whole process, the system automatically determines the type of temperature rise. If a circular temperature distribution field is presented and the temperature is higher as it approaches the center, it is judged as a contact temperature rise; if the temperature on the sun-facing side is higher than that on the back-facing side and the characteristics remain basically unchanged, it is judged as an external temperature rise.

[0065] like Figure 3 As shown, when the contact temperature rises, the heat flow will move upward and eventually appear as a circular temperature distribution field on the cylinder. After removing the influence of sunlight, if the contact has abnormal heating, the array-type temperature measuring tape probe will also sense the circular temperature distribution field, and the closer to the center, the higher the temperature. At this time, the detection result can be judged as a contact temperature rise.

[0066] like Figure 4 As shown in the figure, if the GIS busbar contact does not heat up, the temperature rise on the cylinder surface is only caused by sunlight. The temperature on the sunny side is higher than that on the shady side, and this feature will not change significantly during the 10-minute detection and collection process.

[0067] According to the test results, operation and maintenance personnel can accurately grasp the temperature rise of GIS busbar contacts and formulate the next operation and maintenance strategy accordingly.

[0068] Please refer to Figure 5 As shown, based on the working principle of the above-mentioned GIS busbar contact temperature rise and charged detection device, the present application also provides a GIS busbar contact temperature rise and charged detection method, including:

[0069] S101, generating laser light using the excitation light source 101;

[0070] S102, the laser is transmitted to the temperature measuring zone through the light splitting device 102 and the optical fiber 103 in sequence;

[0071] S103, in the temperature measuring zone, the laser excites the fluorescent optical fiber 103 temperature measuring probe 104, and the fluorescent optical fiber 103 temperature measuring probe 104 sends a corresponding measurement signal according to the temperature of the GIS busbar contact;

[0072] S104, transmitting the measurement signal to the photoelectric conversion module 105, and the photoelectric conversion module 105 converts the measurement signal into an electrical signal;

[0073] S105, the electrical signal is detected and amplified by the signal detection module 106 in turn, and then transmitted to the signal processing module 107;

[0074] S106, the signal processing module 107 processes the electrical signal to generate a temperature signal;

[0075] S107, transmitting the temperature signal to the display screen 108 for display.

[0076] Optionally, the light splitting device 102 includes:

[0077] The tunable filter is used to adjust the wavelength of the laser to match the optimal excitation wavelength of the temperature measuring probe 104 of different fluorescent optical fibers 103 .

[0078] Optionally, the temperature measuring belt further comprises a reinforcing frame;

[0079] The reinforcing frame is embedded in the thermal insulation film to enhance the structural strength of the temperature measuring belt.

[0080] This embodiment uses a GIS busbar contact temperature rise live detection device based on a fluorescent optical fiber 103 array temperature measuring tape to achieve rapid, efficient, real-time, and non-destructive detection of GIS busbar contact temperature rise. The device can accurately distinguish between contact temperature rise and external temperature rise, providing reliable technical support for the operation and maintenance of power facilities such as substations and power plants. The detection effect is particularly good on cloudy days or at night.

Claims

1. A GIS busbar contact temperature rise detection device, characterized in that: include: Excitation light source, spectroscopic device, optical fiber, temperature measuring tape, photoelectric conversion module, signal detection circuit, signal processing unit and display screen; The excitation light source is sequentially connected to the light splitting device, the optical fiber, and the temperature measuring tape; The laser light emitted by the excitation light source passes through the light splitting device and the optical fiber in sequence and reaches the temperature measuring zone; The optical splitting device is sequentially connected to the photoelectric conversion module, the signal detection circuit, the signal processing unit, and the display screen; The temperature measuring belt comprises a fluorescent optical fiber temperature measuring probe and a thermal insulation film, and a plurality of the fluorescent optical fiber temperature measuring probes are arranged in a preset manner on the inner surface of the thermal insulation film; The temperature measuring belt is fixed around the outside of the cylinder where the GIS busbar contact is located; After receiving the excitation of the laser, the fluorescent optical fiber temperature measuring probe on the temperature measuring belt sends out a measurement signal according to the temperature of the GIS busbar contact; The photoelectric conversion module converts the measurement signal into an electrical signal which then passes through a signal detection circuit and a signal processing unit in sequence; The signal processing unit generates a temperature signal according to the electrical signal; The display screen is used to display the temperature signal.

2. According to claim 1, a GIS busbar contact temperature rise detection device is characterized in that: The signal processing unit generates a temperature signal according to the electrical signal, including: Generate a temperature distribution feature according to the temperature signals corresponding to the plurality of fluorescent optical fiber temperature measuring probes; Furthermore, the temperature distribution characteristics are recorded every 30 seconds.

3. According to claim 1, a GIS busbar contact temperature rise detection device is characterized in that: Also includes: Temperature threshold setting module; The temperature threshold setting module is used to preset a safety temperature threshold of the GIS busbar contact, and compare the safety temperature threshold with the temperature signal generated by the signal processing unit. When the temperature signal exceeds the safety temperature threshold, an early warning signal is issued through the display screen.

4. According to claim 1, a GIS busbar contact temperature rise detection device is characterized in that: The light splitting device comprises: Tunable filter, used to adjust the wavelength of laser to match the optimal excitation wavelength of different fluorescent fiber optic temperature measurement probes.

5. According to claim 1, a GIS busbar contact temperature rise live detection device is characterized in that: The temperature measuring belt also includes a reinforcing frame; the reinforcing frame is embedded in the thermal insulation film.

6. A GIS busbar contact temperature rise detection device according to claim 1, characterized in that: Also includes: The remote communication module is used to transmit the temperature signal generated by the signal processing unit to the remote monitoring center through wireless communication.

7. The GIS busbar contact temperature rise live detection device according to claim 1 is characterized in that: The excitation light source is a pulse laser source.

8. A method for detecting the temperature rise of GIS busbar contacts, characterized in that: include: Using an excitation light source to generate laser light; The laser is transmitted to the temperature measuring zone through the light splitting device and the optical fiber in sequence; In the temperature measuring zone, the laser excites the fluorescent optical fiber temperature measuring probe, and the fluorescent optical fiber temperature measuring probe sends a corresponding measurement signal according to the temperature of the GIS busbar contact; Transmitting the measurement signal to a photoelectric conversion module, where the photoelectric conversion module converts the measurement signal into an electrical signal; The electrical signal is sequentially detected and amplified by the signal detection circuit, and then transmitted to the signal processing unit; The signal processing unit processes the electrical signal to generate a temperature signal; Transmit the temperature signal to the display screen for display.

9. A method for detecting the temperature rise of GIS busbar contacts when they are charged according to claim 8, characterized in that: The light splitting device comprises: Tunable filter, used to adjust the wavelength of laser to match the optimal excitation wavelength of different fluorescent fiber optic temperature measurement probes.

10. A method for detecting the temperature rise of GIS busbar contacts when they are charged according to claim 8, characterized in that: The temperature measuring belt also includes a reinforcing frame; the reinforcing frame is embedded in the thermal insulation film.

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