Extremely early detection device and detection method for low-temperature cloud and mist pyrolysis particles of switch cabinet

Abstract

The invention provides a switch cabinet low-temperature mist pyrolysis particle extremely-early detection device and detection method, and belongs to the technical field of power distribution operation and maintenance. The detection device comprises a control terminal, a relay terminal, a pipeline communicated with the switch cabinet environment, and a partial discharge detection device, an air pump, a filter, a pyrolysis particle detector and a cloud and mist detector which are sequentially arranged on the pipeline in the direction away from the switch cabinet. The partial discharge detection device, the air pump, the pyrolysis particle detector and the cloud and mist detector are all in communication connection with the control terminal through the relay terminal which is in communication connection with the partial discharge detection device, the air pump, the pyrolysis particle detector and the cloud and mist detector. According to the invention, gas in different switch cabinet environments can be obtained simultaneously through the pipeline, and the filter, the pyrolysis particle detector, the cloud and mist detector and the partial discharge detector are matched to complete detection of different environments at the same time, so that whether an early or extremely early insulation fault occurs in the switch cabinet can be judged; and harm caused by partial discharge can be prevented in time.

Description

Technical Field

[0001] The present invention belongs to the technical field of power distribution operation and maintenance, and specifically relates to a switch cabinet low-temperature cloud pyrolysis particle extremely early detection device and detection method. Background Art

[0002] High-voltage switchgear is mainly composed of circuit breakers, grounding switches, lightning arresters, current transformers, voltage transformers and live displays, and plays an important role in switching, controlling and protecting the power system. In recent years, with the continuous expansion of the scale of power grids and the gradual increase in voltage levels, ensuring the safe and stable operation of high-voltage switchgear is of great significance to improving the reliability of the entire power system.

[0003] Insulation defects may occur in the wires and inside the insulators of the switch cabinet. Under rated voltage, when the concentrated electric field strength at the insulation defect reaches the breakdown field strength of the area, local discharge will occur. Local discharge will accelerate insulation degradation. Continuous insulation degradation will cause heat and even cause electrical fires, power outages and other accidents.

[0004] Therefore, through comprehensive detection of switch cabinet heating, partial discharge and other phenomena, early or very early insulation faults of the switch cabinet can be detected. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a switch cabinet low-temperature cloud pyrolysis particle extremely early detection device and detection method.

[0006] In order to solve one, part or all of the above technical problems, the technical solution adopted by the present invention is: A switch cabinet low-temperature cloud and fog pyrolysis particle extremely early detection device comprises a control terminal, a relay terminal, a pipeline connected to the switch cabinet environment, and a partial discharge detection device, an air pump, a filter, a pyrolysis particle detector and a cloud and fog detector sequentially arranged on the pipeline in a direction away from the switch cabinet; The partial discharge detection device, the air pump, the pyrolysis particle detector and the cloud detector are all connected to the control terminal by means of the relay terminal connected by communication; The partial discharge detection device is located at the end of the pipeline; The pyrolysis particle detector is used to send a normal detection signal or an abnormal detection signal to the control terminal according to the detection result of the dust particle size in the air; The cloud and fog detector is used to send a normal detection signal or an abnormal detection signal to the control terminal according to the detection result of the air cloud and fog; The partial discharge detection device is used to send a normal detection signal or an abnormal detection signal to the control terminal according to the detection result of the partial discharge.

[0007] Furthermore, the partial discharge detection device includes a control switching device and two partial discharge detectors of different types. The two partial discharge detectors are both arranged on the pipeline and are both electrically connected to the control switching device.

[0008] Furthermore, the two partial discharge detectors are respectively an ultrasonic detector and a UHF detector.

[0009] Furthermore, a single relay terminal is used to aggregate and forward communication signals of the partial discharge detection device, the air pump, the pyrolysis particle detector and the partial discharge detection device provided on a plurality of nearby pipelines.

[0010] Furthermore, it also includes an alarm device and a fire extinguishing device arranged in the switch cabinet environment.

[0011] Furthermore, the pipeline is provided with a valve between the partial discharge detection device and the air pump; the valve automatically opens when the air pump is started and closes when the air pump is shut down.

[0012] A method for detecting very early stage low temperature fog pyrolysis particles in a switch cabinet, implemented by using the detection device according to any one of claims 1 to 6, comprising: S1, after conveying the air in the switch cabinet environment to be detected to the pyrolytic particle detector, start the pyrolytic particle detector for detection; S2, receiving the detection result of the pyrolysis particle detector, if receiving a detection abnormality signal, starting the partial discharge detection device and the cloud detector for detection; if receiving a detection normal signal, entering a standby state and waiting to return to S1 to start the next detection, or directly returning to S1 to start the next detection; S3, receiving the detection results of the cloud and fog detector and the partial discharge detection device, if the number of received abnormal detection signals is greater than the number of received normal detection signals, an alarm signal is issued, otherwise it enters the standby state and waits to return to S1 to start the next detection, or directly returns to S1 to start the next detection.

[0013] Furthermore, the air pump is turned off before starting the pyrolysis particle detector for detection.

[0014] Furthermore, the pyrolysis particle detector obtains the particle sizes of the two peak dusts with the highest content during detection. If any one of the peak dust particle sizes is within the range of 2-20nm and the other peak dust particle size is within the range of 200-300nm, a detection abnormality signal is issued; otherwise, a detection normal signal is issued.

[0015] Furthermore, the method of starting the partial discharge detection device and the cloud and fog detector for detection includes: starting the air pump, delivering the air in the switch cabinet environment to be detected to the cloud and fog detector, turning off the air pump, and starting the partial discharge detection device and the cloud and fog detector for detection.

[0016] Compared with the prior art, the present invention has the following beneficial effects: Each pipeline of the present invention is connected to a set of detection components, through which the gases in different switch cabinet environments can be simultaneously acquired, and in conjunction with filters, pyrolytic particle detectors, cloud detectors and partial discharge detectors, detection of different environments can be completed simultaneously, which can effectively improve the accuracy of pyrolytic particle detection, can determine whether the switch cabinet has an early or very early insulation fault, and can timely prevent the hazards caused by partial discharge.

[0017] In the present invention, a valve is provided in each pipeline. When the valve is opened, the air pump and the space to be detected are closed. The pipeline connection facilitates the arrangement of the detection components and can adapt to different sizes of environments to be detected. At the same time, the pipeline directly obtains air in the switch cabinet environment to be detected, reducing the interference of external air. The original large particles of foreign matter in the air are filtered out by the filter, reducing the interference of dust in the air on the detection results.

[0018] In the present invention, different types of partial discharge detectors are attached to the outsides of different pipelines, and different detection modes are switched by controlling the switching device. Different modes correspond to different partial discharge detectors to work. For example, a rough detection can be performed by a UHF sensor first, and then an ultrasonic fine detection can be performed, so as to achieve the effect of accurately detecting partial discharge.

[0019] In the present invention, each device is connected to the control terminal through a relay terminal, and the connection is convenient. The control terminal can be a mobile device, so that the application can be observed and controlled anytime and anywhere. At the same time, if any two detectors among the pyrolysis particle detector, the cloud detector and the partial discharge detection device have abnormal detection results, an alarm operation will be implemented, the detection efficiency is higher, and the hazards caused by partial discharge can be prevented in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0021] Figure 1 : A schematic diagram of embodiment 1 of the present invention; Figure 2 : Flow chart of Embodiment 2 of the present invention; Among them: 1-pyrolysis particle detector, 2-cloud detector, 3-partial discharge detection device, 31-partial discharge detector, 32-control switching device, 4-pipeline, 5-alarm device, 6-air pump, 7-valve, 8-filter, 9-relay terminal, 10-control terminal, 11-fire extinguishing device. DETAILED DESCRIPTION

[0022] In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the embodiments and the accompanying drawings, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0023] Example 1: See Figure 1 The purpose of this embodiment is to provide a switch cabinet low-temperature cloud pyrolysis particle very early detection device, including a pipeline 4, in which an air pump 6, a filter 8, a pyrolysis particle detector 1 and a cloud detector 2 are arranged in sequence. The end of the pipeline 4 away from the cloud detector 2 is connected to the switch cabinet environment, such as Figure 1 "Environment 1" and "Environment 2" all represent the switch cabinet environment, which can be the internal environment of a single switch cabinet or the environment of the area where multiple adjacent switch cabinets are located. When the air pump 6 is working, the gas in the switch cabinet environment is transmitted to the filter 8, the pyrolysis particle detector 1 and the cloud detector 2 in sequence. The filter 8 is used to filter large particles of foreign matter in the gas, the pyrolysis particle detector 1 is used to detect the dust particle size in the air, and the cloud detector 2 is used to detect the cloud in the air.

[0024] When detecting, the cloud and fog detector 2 will emit a specific beam of light, usually infrared light or laser, into the cloud and fog area; when the light encounters water droplets or ice crystals in the cloud and fog, part of the light will be scattered, that is, the light will be reflected from the surface of the water droplets or ice crystals at different angles. At the same time, part of the light will be directly reflected back to the cloud and fog detector 2 by the water droplets or ice crystals. The receiving element inside the cloud and fog detector 2 will capture these scattered or reflected lights and convert them into electrical signals.

[0025] A partial discharge detection device 3 is provided at the end of the pipeline 4 near the switch cabinet. The partial discharge detection device 3 includes a control switching device 32 and two partial discharge detectors 31 of different types. The two partial discharge detectors 31 are both provided on the pipeline 4 and are both electrically connected to the control switching device 32. The control switching device 32 can switch the working mode, and different working modes correspond to different partial discharge detectors 31. Preferably, the two partial discharge detectors 31 are respectively an ultrasonic detector and a UHF detector. The control switching device 32 first uses the UHF sensor for rough detection, and then uses the ultrasonic detector for fine detection. The joint detection of the two partial discharge detectors 31 can improve the detection accuracy.

[0026] The detection device provided in this embodiment also includes a relay terminal 9 and a control terminal 10. The air pump 6, the pyrolysis particle detector 1, the cloud detector 2, and the control switching device 32 are all connected to the control terminal 10 through the communication-connected relay terminal 9, wherein several switch cabinet environments can share one relay terminal 9, and the relay terminal 9 can gather the communication data of nearby devices, playing a role in communication and information transmission. The air pump 6, the pyrolysis particle detector 1, the cloud detector 2, and the control switching device 32 are all remotely controlled by the control terminal 10. The relay terminal 9 can also be connected to other systems of the power grid to realize data sharing, eliminate information islands, and increase the intelligence of the power grid. The control terminal 10 also has a data display function, which can obtain and display the detection data of each detector.

[0027] The control switching device 32 of the partial discharge detection device 3, the pyrolysis particle detector 1 and the cloud detector 2 are also equipped with a display device, which can display the detection data of the corresponding detector, so that on-site personnel can observe the detection status through the display.

[0028] The detection device provided in this embodiment also includes an alarm device 5, which is connected to the control terminal 10 through the relay terminal 9 and can send a corresponding alarm signal according to the signal of the control terminal 10. The control terminal 10 is used to receive the detection results sent by the pyrolysis particle detector 1, the cloud detector 2 and the partial discharge detection device 3, and can determine whether to send an alarm signal to the alarm device 5 according to the detection results.

[0029] The detection device provided in this embodiment further includes a fire extinguishing device 11 arranged in the switch cabinet environment, and the fire extinguishing device 11 is communicatively connected or electrically connected to the alarm device 5 .

[0030] A valve 7 is provided on the pipeline 4 on the side of the partial discharge detection device 3 close to the air pump 6. The valve 7 is connected to the control terminal 10 through the relay terminal 9, and the control terminal 10 can control the on and off of the pipeline 4 through the valve 7. When the air pump 6 transmits the air in the switch cabinet environment to the pyrolysis particle detector 1, the valve 7 is closed, and the valve 7 is opened again after the pyrolysis particle detector 1 finishes the detection, thereby ensuring the stability of the air in the pipeline 4 and preventing the detection result of the pyrolysis particle detector 1 from being affected.

[0031] The devices that are communicatively connected to the relay terminal 9 can also be communicatively connected to each other using the relay terminal 9, thereby realizing data communication and linkage between different devices.

[0032] The valve 7 and the air pump 6 have a linkage function, and the valve 7 can be automatically opened before the air pump 6 is started, and the valve 7 can be automatically closed after the air pump 6 is shut down.

[0033] The pyrolysis particle detector 1 has a linkage function with the air pump 6 and the cloud detector 2. After the pyrolysis particle detector 1 completes the detection, if the cloud detector 2 needs to be used for further detection, the air pump 6 is started to deliver air. After the delivery is completed, the air pump 6 is turned off and the cloud detector 2 is started to perform cloud detection.

[0034] The pyrolysis particle detector 1 and the partial discharge detection device 3 have a linkage function. After the pyrolysis particle detector 1 has completed detection, if further detection is required using the partial discharge detection device 3, the partial discharge detection device 3 is started to perform partial discharge detection.

[0035] The fire extinguishing device 11 and the alarm device 5 have a linkage function. If the alarm device 5 receives a fire alarm signal, the fire extinguishing device 11 is automatically activated to extinguish the fire.

[0036] Example 2: See Figure 2 The purpose of this embodiment is to provide a method for extremely early detection of low-temperature cloud pyrolysis particles in a switch cabinet, and the detection method is implemented using the detection device provided in Example 1.

[0037] The detection method comprises: S1. The control terminal 10 starts the air pump 6. After the air in the switch cabinet environment to be detected is transported to the pyrolysis particle detector 1, the air pump 6 is turned off and the pyrolysis particle detector 1 is started for detection.

[0038] When the control terminal 10 receives the detection signal or reaches the preset detection time, it sends a start signal to start executing S1.

[0039] The valve 7 and the air pump 6 have a linkage function, and the valve 7 can be automatically opened before the air pump 6 is started, and the valve 7 can be automatically closed after the air pump 6 is shut down.

[0040] S2, the control terminal 10 receives the detection result sent by the pyrolysis particle detector 1. If a detection abnormality signal is received, the air pump 6 is started. After the switch cabinet environmental gas is transported to the cloud detector 2, the air pump 6 is turned off, and the partial discharge detection device 3 and the cloud detector 2 are started for detection; if a detection normal signal is received, the standby state is entered to wait for the next start, or directly returns to S1 to start the next detection.

[0041] When the pyrolysis particle detector 1 performs detection, it obtains the particle sizes of the two peak dusts with the highest content. If any one of the peak dust particle sizes is within the range of 2-20nm and the other peak dust particle size is within the range of 200-300nm, the detection result is judged to be abnormal, and a detection abnormality signal is sent to the control terminal 10; otherwise, the detection result is judged to be normal, and a detection normal signal is sent to the control terminal 10.

[0042] After each detection, the pyrolysis particle detector 1 will also display the detection result on a matching display.

[0043] When the control terminal 10 receives the abnormal detection signal sent by the pyrolysis particle detector 1, the cloud detector 2 and the partial discharge detection device 3 are started for further detection.

[0044] S3, the control terminal 10 receives the detection results sent by the cloud and fog detector 2 and the partial discharge detection device 3. If the number of abnormal detection signals received by the control terminal 10 is greater than the number of normal detection signals, an abnormal alarm signal is sent to the alarm device 5, otherwise it enters the standby state and waits for the next start, or directly returns to S1 to start the next detection.

[0045] When the cloud and fog detector 2 detects, it determines whether the detection data exceeds the threshold value. If so, it sends a detection abnormality signal to the control terminal 10, otherwise it sends a detection normal signal to the control terminal 10. The method for determining whether the detection data exceeds the threshold value is: determining whether the detection data exceeds the preset value; or processing the detection data through the weight algorithm technology to obtain new data, and determining whether the new data exceeds the preset value; or respectively calculating the increment of the detection data in the same time interval, and determining whether the increment exceeds the preset value.

[0046] When the partial discharge detection device 3 detects, the control switching device 32 respectively starts the two partial discharge detectors 31 for detection. If partial discharge is detected, a detection abnormality signal is sent to the control terminal 10, otherwise a detection normal signal is sent to the control terminal 10. Preferably, the two partial discharge detectors 31 are ultrasonic detectors and ultra-high frequency detectors, respectively, and the control switching device 32 first uses the ultra-high frequency sensor for rough detection, and then uses the ultrasonic detector for fine detection.

[0047] After each detection, the cloud and fog detector 2 and the partial discharge detection device 3 will also display the detection results on the matching display.

[0048] The number of abnormal detection signals received by the control terminal 10 is the total number of abnormal detection signals sent by the pyrolysis particle detector 1, the cloud detector 2 and the partial discharge detection device 3. The number of normal detection signals received by the control terminal 10 is the total number of normal detection signals sent by the pyrolysis particle detector 1, the cloud detector 2 and the partial discharge detection device 3.

[0049] When entering the standby state, the control terminal 10 controls the pyrolysis particle detector 1, the cloud detector 2 and the partial discharge detection device 3 to enter the standby detection state.

[0050] Furthermore, the detection method also includes: Before the control terminal 10 sends a start signal, the system first performs a self-check. During the system self-check, it determines whether the pyrolysis particle detector 1, the cloud detector 2 and the partial discharge detection device 3 are in the state to be detected. If so, the self-check passes. Otherwise, it means that the system itself has a fault, and an alarm signal is sent to the alarm device 5 to remind the staff to handle it.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A switch cabinet low-temperature cloud pyrolysis particle very early detection device, characterized in that: It includes a control terminal, a relay terminal, a pipeline connected to the switch cabinet environment, and a partial discharge detection device, an air pump, a filter, a pyrolysis particle detector and a cloud detector sequentially arranged on the pipeline in a direction away from the switch cabinet; The partial discharge detection device, the air pump, the pyrolysis particle detector and the cloud detector are all connected to the control terminal by means of the relay terminal connected by communication; The partial discharge detection device is located at the end of the pipeline; The pyrolysis particle detector is used to send a normal detection signal or an abnormal detection signal to the control terminal according to the detection result of the dust particle size in the air; The cloud and fog detector is used to send a normal detection signal or an abnormal detection signal to the control terminal according to the detection result of the air cloud and fog; The partial discharge detection device is used to send a normal detection signal or an abnormal detection signal to the control terminal according to the detection result of the partial discharge.

2. The switch cabinet low-temperature cloud pyrolysis particle extremely early detection device according to claim 1 is characterized in that: The partial discharge detection device comprises a control switching device and two partial discharge detectors of different types. The two partial discharge detectors are both arranged on the pipeline and are both electrically connected to the control switching device.

3. The switch cabinet low-temperature cloud pyrolysis particle extremely early detection device according to claim 2 is characterized in that: The two partial discharge detectors are respectively an ultrasonic detector and a UHF detector.

4. The switch cabinet low-temperature cloud pyrolysis particle extremely early detection device according to claim 1 is characterized in that: The single relay terminal is used to aggregate and forward the communication signals of the partial discharge detection devices, the air pump, the pyrolysis particle detector and the partial discharge detection devices arranged on a plurality of nearby pipelines.

5. The switch cabinet low-temperature cloud pyrolysis particle extremely early detection device according to claim 1 is characterized in that: It also includes an alarm device and a fire extinguishing device arranged in the switch cabinet environment.

6. The switch cabinet low-temperature cloud pyrolysis particle extremely early detection device according to claim 1 is characterized in that: The pipeline is provided with a valve between the partial discharge detection device and the air pump; the valve automatically opens when the air pump is started and closes when the air pump is shut down.

7. A method for early detection of low-temperature cloud pyrolysis particles in a switch cabinet, implemented by using the detection device according to any one of claims 1 to 6, characterized in that: include: S1, after conveying the air in the switch cabinet environment to be detected to the pyrolytic particle detector, start the pyrolytic particle detector for detection; S2, receiving the detection result of the pyrolysis particle detector, if receiving a detection abnormality signal, starting the partial discharge detection device and the cloud detector for detection; if receiving a detection normal signal, entering a standby state and waiting to return to S1 to start the next detection, or directly returning to S1 to start the next detection; S3, receiving the detection results of the cloud and fog detector and the partial discharge detection device, if the number of received abnormal detection signals is greater than the number of received normal detection signals, an alarm signal is issued, otherwise it enters the standby state and waits to return to S1 to start the next detection, or directly returns to S1 to start the next detection.

8. The switch cabinet low-temperature mist pyrolysis particle extremely early detection method according to claim 7 is characterized in that: The gas pump is turned off before starting the pyrolysis particle detector for detection.

9. The switch cabinet low-temperature mist pyrolysis particle extremely early detection method according to claim 7 is characterized in that: The pyrolysis particle detector obtains the particle sizes of the two peak dusts with the highest content during detection. If any one of the peak dust particle sizes is within the range of 2-20nm and the other peak dust particle size is within the range of 200-300nm, a detection abnormality signal is issued; otherwise, a detection normal signal is issued.

10. The switch cabinet low-temperature mist pyrolysis particle extremely early detection method according to claim 7 is characterized in that: The method of starting the partial discharge detection device and the cloud and fog detector for detection includes: starting the air pump, conveying the air in the switch cabinet environment to be detected to the cloud and fog detector, then turning off the air pump, and starting the partial discharge detection device and the cloud and fog detector for detection.

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