On-line control and monitoring method and system for cooling fan of transformer substation switch cabinet

Abstract

The invention discloses an online control and monitoring method for a heat dissipation fan of a switch cabinet of a transformer substation, and solves the problem that the heat dissipation fan in the switch cabinet is difficult to monitor in real time in the existing switch cabinet. The invention provides an on-line control and monitoring method for a heat dissipation fan of a switch cabinet of a transformer substation. The method comprises the following steps: S100, obtaining an internal temperature value TMPn of the switch cabinet of the transformer substation; s200, when TMPn is larger than a preset temperature value TMPa, a cooling fan is started, and S300 is executed; when the internal temperature value is smaller than the preset temperature value, the cooling fan is stopped, and the step S100 is executed again; s300, in the starting state of the cooling fan, the output air pressure numerical value PA of the cooling fan is obtained; and S400, judging whether the heat dissipation fan works normally or not according to the PA, if not, giving an alarm and displaying that the heat dissipation fan is in an abnormal state, and if yes, returning to the step S100. The invention further provides an on-line control and monitoring system of the transformer substation switch cabinet cooling fan. The on-line control and monitoring system of the transformer substation switch cabinet cooling fan comprises the on-line control and monitoring method of the transformer substation switch cabinet cooling fan.

Description

Technical Field

[0005]

[0001] The present invention relates to the technical field of power equipment, especially an online control, monitoring method and system for the cooling fan of a substation switch cabinet. Background Art

[0002] In a switch cabinet in a substation, especially in a high-current switch cabinet, cooling fans are usually installed to reduce the temperature inside the cabinet. However, due to the enclosed structure design of the switch cabinet and the fact that the cooling fans are usually installed inside or on the top of the switch cabinet, it is difficult to monitor whether the cooling fans are working properly during normal operation. It is often necessary to conduct regular power outages for maintenance to detect the fans and determine whether they are normal.

[0003] In this way, it often leads to the fans operating with "hidden problems", and it is impossible to timely detect the fans that have failed or have potential faults, resulting in possible problems such as abnormal temperature rise in the switch cabinet. At the same time, it may also cause major safety hazards and lead to problems such as forced outage and power failure due to faults. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and propose an online control and monitoring method for the cooling fan of a substation switch cabinet to solve the problem that it is difficult to monitor the internal cooling fan of the existing switch cabinet in real time.

[0005] To achieve the above technical objectives, the online control and monitoring method for the cooling fan of a substation switch cabinet proposed by the present invention includes the following steps: S100: Obtain the internal temperature value TMPn of the substation switch cabinet; S200: When TMPn is greater than or equal to the predetermined temperature value TMPa, start the cooling fan and enter S300; when the internal temperature value is less than the predetermined temperature value, stop the cooling fan and return to S100; S300: When the cooling fan is in the startup state, obtain the output air pressure value PA of the cooling fan; S400: Judge whether the cooling fan is working properly according to PA. If it is not normal, give an alarm and display that the cooling fan is in an abnormal state. If it is normal, return to S100.

[0006] Preferably, in S400, when PA is less than the preset air pressure value PN, give an alarm and display that the cooling fan is in an abnormal state.

[0007] Preferably, when PN*60% ≤ PA < PN, give an alarm and display that the cooling fan is in the first abnormal state.

[0008] Preferably, when PN*20% ≤ PA < PN*60%, give an alarm and display that the cooling fan is in the second abnormal state.

[0009] Preferably, when PA < 20% of PN, an alarm is given and it is shown that the cooling fan is in the third abnormal state.

[0010] Preferably, there is also S110 between S100 and S200: recording the value of TMPn and obtaining time information.

[0011] Preferably, there is also S310 between S300 and S400: recording the value of PA and obtaining time information.

[0012] Preferably, after S400, there are the following steps: S410: uploading the abnormal PA and the time information for obtaining PA to the alarm terminal; S420: the alarm terminal reads the address information of the data source, and uploads the address information, the abnormal PA and the time information for obtaining PA to the terminal; S430: the terminal stores the address information, the abnormal PA and the time information for obtaining PA in the database, and adds the above content to the log file S440: generating an operating state curve and a data report of the abnormal state of the cooling fan according to the data of the address information, the abnormal PA and the time information for obtaining PA from the same source.

[0013] The present invention also provides an on-line control and monitoring system for a cooling fan of a substation switch cabinet, including a control module, and the control module includes the on-line control and monitoring method for the cooling fan of the substation switch cabinet in any of the above technical solutions.

[0014] Preferably, it includes a cooling fan monitoring device, a temperature sensor, a wind pressure sensor and an alarm device. The temperature sensor and the wind pressure sensor are electrically connected to the cooling fan monitoring device. The cooling fan monitoring device includes the control module and a communication module. The control module is used to control and monitor the cooling fan, and the control module sends corresponding alarm signals to the alarm device through the communication module.

[0015] The beneficial effects of the present invention are: By judging the output air pressure value PA of the cooling fan, the operating status of the cooling fan can be obtained simply and intuitively, so as to judge whether the cooling fan is faulty or has a risk of failure, which is convenient for timely understanding the situation of the cooling fan in the substation switch cabinet. When individual cooling fans in the substation switch cabinet have a fault or a risk of failure, the cooling fan that has a fault or a risk of failure can be directly replaced when the substation switch cabinet is shut down for maintenance without the need for detection, thereby speeding up the power outage maintenance. When multiple cooling fans in the substation switch cabinet have a fault or a risk of failure, the power outage maintenance of the substation switch cabinet can be arranged in time to avoid the safety hazards of the substation switch cabinet causing failures.

[0016] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Flowchart of an online control and monitoring method for a heat dissipation fan of a substation switch cabinet according to an embodiment of the present invention; Figure 2 Another flow chart of the online control and monitoring method of the heat dissipation fan of the substation switch cabinet according to an embodiment of the present invention; Figure 3 Schematic diagram of an online control and monitoring system for a heat dissipation fan in a substation switch cabinet according to an embodiment of the present invention; Figure 4 This is a connection diagram of various modules in the online control and monitoring system of the heat dissipation fan of the substation switch cabinet in an embodiment of the present invention.

[0018] Reference numerals: 10. Switchgear; 20. Cooling fan; 30. Cooling fan monitoring device; 40. Alarm device. DETAILED DESCRIPTION

[0019] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" or "several" means two or more, unless otherwise explicitly specified.

[0022] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0023] In the embodiment of the present invention, Figure 1 、 Figure 3 、 Figure 4 The proposed online control and monitoring method for a substation switchgear cooling fan is implemented through an online control and monitoring system for the substation switchgear cooling fan. The system includes a cooling fan monitoring device, a temperature sensor, a wind pressure sensor, and an alarm device. The cooling fan monitoring device includes a control module and a communication module. The temperature sensor and wind pressure sensor are electrically connected to the control module. The temperature sensor is used to obtain the internal temperature value TMPn of the substation switchgear and send it to the control module. The wind pressure sensor is used to obtain the output wind pressure value PA of the cooling fan and send it to the control module. The control module is used to control and monitor the cooling fan, and the control module sends corresponding alarm signals to the alarm device via the communication module. The alarm device also uploads the corresponding data to the terminal for reporting.

[0024] The temperature sensor is located near the center of the switchgear 10 and is used to measure the temperature in the central area of ​​the switchgear 10. The wind pressure sensor is installed in the solid center of the protective screen at the air outlet of the cooling fan 20. The wind pressure sensor includes a conduit and a sensor body. The conduit guides the wind pressure generated by the cooling fan to the interior of the sensor body to obtain the wind pressure value.

[0025] Typically, a substation switch cabinet 10 is equipped with multiple cooling fans 20. Each of the multiple cooling fans 20 corresponds to a cooling fan monitoring device 30, and each of the multiple cooling fan monitoring devices 30 corresponds to an alarm device 40. The monitoring signals of the multiple cooling fans 20 correspond to a display window or a display light on the alarm device 40, and an alarm is issued through text display in the display window or flashing of different colors and frequencies of the display light. A cooling fan that is working properly may show a normal status in the display window, or the display light may show green. The online control and monitoring method of the heat dissipation fan of the substation switch cabinet of the present invention specifically comprises the following steps: S100: Obtain the internal temperature value TMPn of the substation switch cabinet; S200: When TMPn is greater than or equal to the predetermined temperature value TMPa, the cooling fan is started and the process proceeds to S300; when the internal temperature value is less than the predetermined temperature value, the cooling fan is stopped and the process returns to S100; S300: When the cooling fan is in the started state, obtain the output air pressure value PA of the cooling fan; S400: Determine whether the cooling fan is operating normally based on PA. If not, an alarm is issued and the cooling fan is displayed as being in an abnormal state. If normal, return to S100.

[0026] The predetermined temperature value TMPa is set based on experience. Normally, TMPa is not less than 25°.

[0027] Since the wind pressure gradually increases during the startup of the cooling fan, in order to avoid false alarms caused by low wind pressure when the cooling fan is just started, a delay is set between S200 and S300, which can be 4 seconds or 5 seconds.

[0028] In this solution, the determination requirement of the output air pressure value PA of the cooling fan is simplified. When PA=0 or PA is less than a predetermined value, the cooling fan is determined to be faulty and an alarm is issued for the cooling fan.

[0029] By judging the output air pressure value PA of the cooling fan, the operating state of the cooling fan can be simply and intuitively obtained, so as to judge whether the cooling fan is faulty or there is a risk of failure, which is convenient for timely understanding of the situation of the cooling fan in the substation switch cabinet. When there is a fault or a risk of failure in an individual cooling fan in the substation switch cabinet, the faulty or potentially faulty cooling fan can be directly replaced during the power-off maintenance of the substation switch cabinet without detection, which speeds up the power-off maintenance. When there are faults or risks of failure in multiple cooling fans in the substation switch cabinet, the power-off maintenance of the substation switch cabinet can be arranged in time to avoid the occurrence of faults caused by potential safety hazards in the substation switch cabinet.

[0030] Based on the online control and monitoring method of the cooling fan of the substation switch cabinet in the foregoing embodiment, as Figure 2 shown, in this embodiment, in S400, when PA is less than the preset air pressure value PN, an alarm is given and it is displayed that the cooling fan is in an abnormal state.

[0031] The preset air pressure value PN can be set to a relatively small value, such as 30% of the rated air pressure of the cooling fan. When PA is less than PN, it means that the cooling fan is no longer in a good working state. An alarm is used to remind the monitor that the cooling fan is in a bad state, which is convenient for relevant personnel to arrange the maintenance schedule in time.

[0032] In one embodiment, as Figure 2 shown, based on the online control and monitoring method of the cooling fan of the substation switch cabinet in the foregoing embodiment, the bad state of the cooling fan is further refined. When PN*60%≤PA<PN, an alarm is given and it is displayed that the cooling fan is in the first abnormal state.

[0033] In this embodiment, PN can be set to a relatively large value, such as 70% of the rated air pressure of the cooling fan. The first abnormal state can be that the working state of the cooling fan is shown as poor in the display window or the display light shows blue.

[0034] In one embodiment, as Figure 2 shown, based on the online control and monitoring method of the cooling fan of the substation switch cabinet in the foregoing embodiment, the bad state of the cooling fan is further refined. When PN*20%≤PA<PN*60%, an alarm is given and it is displayed that the cooling fan is in the second abnormal state.

[0035] The second abnormal state can be that the working state of the cooling fan is shown as not good in the display window or the display light shows orange.

[0036] In one embodiment, as Figure 2As shown, based on the online control and monitoring method of the substation switchgear cooling fan in the foregoing embodiment, the abnormal state of the cooling fan is further refined for judgment. When PA < 20% of PN, an alarm is given and it is displayed that the cooling fan is in the third abnormal state.

[0037] The third abnormal state can be that the failure of the cooling fan is displayed on the display window or the display light shows red.

[0038] Through the above settings, different working states of the cooling fan can be displayed. For the monitoring personnel, they can timely pay attention to the cooling fans with potential failure risks and follow up their subsequent changes, which is convenient for arranging the power outage maintenance schedule of the substation switchgear, reducing or avoiding temporary emergency repairs, and also convenient for arranging the procurement and transportation of the cooling fans.

[0039] In one embodiment, based on the online control and monitoring method of the substation switchgear cooling fan in the foregoing embodiment, there is also S110 between S100 and S200: record the value of TMPn and obtain the time information.

[0040] The cooling fan monitoring device further includes a data storage module. The value of TMPn and the obtained time information are stored in the data storage module. The data storage module is provided with a reading port, and the data stored in the data storage module can be read through the reading port.

[0041] In one embodiment, as Figures 1 to 4 shown, based on the online control and monitoring method of the substation switchgear cooling fan in the foregoing embodiment, there is also S310 between S300 and S400: record the value of PA and obtain the time information.

[0042] The value of PA and the obtained time information are stored in the data storage module.

[0043] In one embodiment, as Figures 1 to 4 shown, based on the online control and monitoring method of the substation switchgear cooling fan in the foregoing embodiment, there is also S320 after S310: back up the value of TMPn and the obtained time information, and the value of PA and the obtained time information.

[0044] The cooling fan monitoring device further includes a data backup module. The data backup module backs up the data in the data storage module. The data backup module is provided with a reading port, and the data stored in the data backup module can be read through the reading port.

[0045] In one embodiment, based on the online control and monitoring method of the substation switchgear cooling fan in the foregoing embodiment, there are also the following steps after S400: S410: upload the abnormal PA and the time information for obtaining PA to the alarm terminal; S420: The alarm terminal reads the address information of the data source and uploads the address information, abnormal PA and time information of obtaining PA to the terminal; S430: The terminal stores the address information, the abnormal PA, and the time information of obtaining the PA in a database, and adds the above content to a log file; S440: Generating an operation status curve and a data report of an abnormal state of the cooling fan according to the address information from the same source, the abnormal PA, and the time information of obtaining the PA.

[0046] The alarm terminal is an alarm device. The address information of the data source corresponds to a specific cooling fan in a switch cabinet. This address information can be the hardware encoding information of the wind pressure sensor, or the corresponding address information can be pre-set for each wind pressure sensor in the cooling fan monitoring device. The alarm terminal uploads the alarm data uploaded by the cooling fan monitoring device to the terminal, which stores this data in a preset database. The terminal can access data with the address information and generate operating status curves and data reports of abnormal cooling fan conditions. This allows monitoring personnel to quickly understand the cooling fan's operating status and predict its service life, thereby scheduling subsequent power outages, maintenance, and replacement.

[0047] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. An online control and monitoring method for a heat dissipation fan of a substation switch cabinet, characterized in that: It includes the following steps: S100: Obtain the internal temperature value TMPn of the substation switch cabinet; S200: When TMPn is greater than or equal to the predetermined temperature value TMPa, start the cooling fan and enter S300; when the internal temperature value is less than the predetermined temperature value, stop the cooling fan and return to S100; S300: When the cooling fan is in the startup state, obtain the output air pressure value PA of the cooling fan; S400: Judge whether the cooling fan is working normally according to PA. If it is abnormal, give an alarm and display that the cooling fan is in an abnormal state. If it is normal, return to S100.

2. The online control and monitoring method for the heat dissipation fan of the substation switch cabinet according to claim 1 is characterized in that: In S400, when PA is less than the preset air pressure value PN, give an alarm and display that the cooling fan is in an abnormal state.

3. The online control and monitoring method for the heat dissipation fan of the substation switch cabinet according to claim 2 is characterized in that: When PN*60%≤PA<PN, give an alarm and display that the cooling fan is in the first abnormal state.

4. The online control and monitoring method for the heat dissipation fan of the substation switch cabinet according to claim 2 is characterized in that: When PN*20%≤PA<PN*60%, give an alarm and display that the cooling fan is in the second abnormal state.

5. The online control and monitoring method for the heat dissipation fan of the substation switch cabinet according to claim 2 is characterized in that: When PA<PN*20%, give an alarm and display that the cooling fan is in the third abnormal state.

6. The online control and monitoring method for the heat dissipation fan of the substation switch cabinet according to claim 1 is characterized in that: There is also S110 between S100 and S200: Record the value of TMPn and obtain the time information.

7. The online control and monitoring method for the heat dissipation fan of the substation switch cabinet according to claim 6 is characterized in that: There is also S310 between S300 and S400: Record the value of PA and obtain the time information.

8. The online control and monitoring method for a heat dissipation fan of a substation switch cabinet according to any one of claims 1 to 5, characterized in that: After S400, there are the following steps: S410: Upload the abnormal PA and the time information for obtaining PA to the alarm terminal; S420: The alarm terminal reads the address information of the data source, and uploads the address information, the abnormal PA and the time information for obtaining PA to the terminal; S430: The terminal stores the address information, the abnormal PA and the time information for obtaining PA in the database, and adds the above content to the log file; S440: Generate an operating state curve and a data report of the abnormal state of the cooling fan according to the data of the address information, the abnormal PA and the time information for obtaining PA from the same source.

9. The online control and monitoring system of the cooling fan of the substation switch cabinet is characterized by: It includes a control module, and the control module includes the on-line control and monitoring method of the cooling fan of the substation switch cabinet according to any one of claims 1 to 8.

10. The online control and monitoring system for the heat dissipation fan of the substation switch cabinet according to claim 9, characterized in that: It includes a cooling fan monitoring device, a temperature sensor, a wind pressure sensor and an alarm device. The cooling fan monitoring device includes the control module and a communication module. The temperature sensor and the wind pressure sensor are electrically connected to the control module. The temperature sensor is used to obtain the internal temperature value TMPn of the substation switch cabinet and send it to the control module. The wind pressure sensor is used to obtain the output air pressure value PA of the cooling fan and send it to the control module. The control module is used to control and monitor the cooling fan, and the control module sends corresponding alarm signals to the alarm device through the communication module.

Images