A method and system for monitoring the working status of a substation circuit breaker electric heating system

Abstract

The present disclosure provides a method and system for monitoring the working state of an electric heating system of a substation circuit breaker, comprising the following steps: obtaining a substation ambient temperature curve and a circuit breaker temperature curve; based on the substation ambient temperature curve, obtaining the rate of change and real-time temperature of the substation ambient temperature at the current moment, and when the rate of change and real-time temperature of the substation ambient temperature both meet the conditions for the normal operation of the circuit breaker, adjusting the working state of the electric heating system in real time; in the process of monitoring the working state of the electric heating system, obtaining the rate of change and real-time temperature of the circuit breaker temperature at the current moment based on the circuit breaker temperature curve, and optimizing and adjusting the working state of the electric heating system in real time. The present disclosure monitors the real-time operating state of the electric heating system based on the detection of the substation environment and the real-time temperature of the circuit breaker, realizes digital information collection, reduces the degree of manual participation, effectively reduces the operation and maintenance costs, and improves the safety and reliability of substation operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of substations, and in particular relates to a method and system for monitoring the working status of an electric heating system of a substation circuit breaker. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] In order to ensure the safe operation of the substation circuit breaker in a low temperature environment, an electric heating system needs to be installed to make the substation circuit breaker operate at an appropriate temperature. The electric heating system is used as a heat preservation material for the substation circuit breaker to prevent the circuit breaker from operating normally due to too low a temperature, which affects the reliability of the power system operation. After the electric heating system is wrapped around the circuit breaker, it is sealed with an insulation layer, then fixed with iron sheet protection, and finally wrapped with insulation cotton. Therefore, after the electric heating system is put into use, the real-time operating temperature of the circuit breaker cannot be detected by direct touch or direct use of temperature measuring equipment. If the circuit breaker temperature is too low, it will directly affect the normal operation of the power system.

[0004] Therefore, staff are required to conduct regular inspections to determine the working status of the circuit breakers in the substation, which brings high workload to the staff and increases the difficulty of operation and maintenance. Manual inspections have the following problems:

[0005] First, the inspection is intermittent, and it is impossible to conduct real-time inspection of each circuit breaker in the substation, and it is impossible to find problems in the electric heating system in time, which directly affects the normal operation of the substation;

[0006] Second, the workload is high and the manual operation and maintenance costs are high;

[0007] Third, when the electric heating system is installed in a high or dangerous place, it is not convenient for inspection;

[0008] Fourth, there is a lack of quantitative analysis of the real-time operating data of the electric heating system. Summary of the invention

[0009] In order to solve the above problems, the present invention proposes a method and system for monitoring the working status of an electric heating system of a substation circuit breaker. The present invention is based on the detection of the substation environment and the real-time temperature of the circuit breaker, monitors the real-time operating status of the electric heating system, realizes digital information collection, reduces the degree of manual participation, effectively reduces the operation and maintenance costs, and improves the safety and reliability of substation operation.

[0010] According to some embodiments, a first solution of the present disclosure provides a method for monitoring the working status of a substation circuit breaker electric heating system, which adopts the following technical solution:

[0011] A method for monitoring the working status of a substation circuit breaker electric heating system comprises the following steps:

[0012] Obtain substation ambient temperature curve and circuit breaker temperature curve;

[0013] Based on the substation ambient temperature curve, the change rate and real-time temperature of the substation ambient temperature at the current moment are obtained. When the change rate and real-time temperature of the substation ambient temperature meet the conditions for the normal operation of the circuit breaker, the working state of the electric heating system is adjusted in real time;

[0014] In the process of adjusting the working state of the electric heating system in real time, the change rate of the circuit breaker temperature and the real-time temperature at the current moment are obtained based on the circuit breaker temperature curve, and the working state of the electric heating system is optimized and adjusted in real time.

[0015] As a further technical limitation, the rate of change of the substation ambient temperature and the real-time temperature when the circuit breaker is operating normally are initially set as required.

[0016] As a further technical limitation, when the rate of change of the substation ambient temperature and the real-time temperature do not meet the conditions for the normal operation of the circuit breaker, it is determined whether the real-time temperature of the circuit breaker has changed. If not, the electric heating system is operating abnormally; otherwise, the substation ambient temperature is abnormal.

[0017] As a further technical limitation, during the real-time adjustment of the working state of the electric heating system, if the substation ambient temperature curve changes in a positive correlation and the substation ambient temperature is greater than a preset upper limit of the ambient temperature threshold, the electric heating system is shut down.

[0018] As a further technical limitation, during the real-time adjustment of the working state of the electric heating system, if the substation ambient temperature curve changes in a negative correlation and the substation ambient temperature is lower than a preset ambient temperature threshold lower limit, the electric heating system is turned on.

[0019] Furthermore, if the current real-time temperature of the circuit breaker is lower than the lower limit of the lowest preset temperature, or the current temperature rise rate of the circuit breaker slows down, the electric heating system parameters are optimized while the electric heating system is turned on.

[0020] Furthermore, if the current real-time temperature of the circuit breaker is higher than the lowest preset temperature upper limit, the electric heating system parameters are optimized while the electric heating system is turned on.

[0021] According to some embodiments, a second solution of the present disclosure provides a substation circuit breaker electric heating system working status monitoring system, which adopts the following technical solutions:

[0022] A working status monitoring system for a substation circuit breaker electric heating system, comprising:

[0023] An acquisition module is configured to acquire a substation environment temperature curve and a circuit breaker temperature curve;

[0024] The monitoring module is configured to obtain the change rate and real-time temperature of the substation ambient temperature at the current moment based on the substation ambient temperature curve, and adjust the working state of the electric heating system in real time when the change rate and real-time temperature of the substation ambient temperature both meet the conditions for the normal operation of the circuit breaker;

[0025] In the process of adjusting the working state of the electric heating system in real time, the change rate of the circuit breaker temperature and the real-time temperature at the current moment are obtained based on the circuit breaker temperature curve, and the working state of the electric heating system is optimized and adjusted in real time.

[0026] According to some embodiments, a third solution of the present disclosure provides a computer-readable storage medium, which adopts the following technical solution:

[0027] A computer-readable storage medium stores a program thereon, which, when executed by a processor, implements the steps in the method for monitoring the working status of an electric heating system of a substation circuit breaker as described in the first aspect of the present disclosure.

[0028] According to some embodiments, a fourth solution of the present disclosure provides an electronic device, which adopts the following technical solution:

[0029] An electronic device comprises a memory, a processor and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps in the method for monitoring the working status of an electric heating system of a substation circuit breaker as described in the first aspect of the present disclosure are implemented.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention is based on the detection of the substation environment and the real-time temperature of the circuit breaker, monitors the real-time operating status of the electric heating system, realizes digital information collection, reduces the degree of manual participation, effectively reduces the operation and maintenance costs, and improves the safety and reliability of substation operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure.

[0033] Figure 1 is a flow chart of a method for monitoring the working status of a substation circuit breaker electric heating system in a first embodiment of the present disclosure;

[0034] Figure 2 It is a structural block diagram of the working status monitoring system of the substation circuit breaker electric heating system in the second embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0036] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present disclosure belongs.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] In the absence of conflict, the embodiments in the present disclosure and the features in the embodiments may be combined with each other.

[0039] Embodiment 1

[0040] Embodiment 1 of the present disclosure introduces a method for monitoring the working status of an electric heating system of a substation circuit breaker.

[0041] like Figure 1 A method for monitoring the working status of a substation circuit breaker electric heating system is shown, comprising the following steps:

[0042] Obtain substation ambient temperature curve and circuit breaker temperature curve;

[0043] Based on the substation ambient temperature curve, obtain the change rate and real-time temperature of the substation ambient temperature at the current moment;

[0044] When the rate of change of the substation ambient temperature and the real-time temperature both meet the conditions for the normal operation of the circuit breaker, the working state of the electric heating system is adjusted in real time, the rate of change of the circuit breaker temperature and the real-time temperature are obtained based on the circuit breaker temperature curve, and the working state of the electric heating system is optimized and adjusted in real time;

[0045] When the rate of change of the substation ambient temperature and the real-time temperature do not meet the conditions for the normal operation of the circuit breaker, it is determined whether the real-time temperature of the circuit breaker changes. If not, the electric heating system is abnormal. Otherwise, the substation ambient temperature is abnormal.

[0046] In the process of adjusting the working state of the electric heating system in real time, if the change of the substation ambient temperature curve is positively correlated and the substation ambient temperature is greater than the preset upper limit of the ambient temperature threshold, the electric heating system is turned off;

[0047] In the real-time adjustment of the working state of the electric heating system, if the change of the substation ambient temperature curve is negatively correlated and the substation ambient temperature is less than the preset ambient temperature threshold lower limit, the electric heating system is turned on; specifically:

[0048] If the current real-time temperature of the circuit breaker is lower than the lower limit of the lowest preset temperature, or the rising rate of the current circuit breaker temperature slows down, the electric heating system parameters are optimized while the electric heating system is turned on;

[0049] If the current real-time temperature of the circuit breaker is higher than the lowest preset temperature upper limit, the electric heating system parameters are optimized while the electric heating system is turned on.

[0050] As one or more implementation modes, the rate of change of the substation ambient temperature and the real-time temperature when the circuit breaker is operating normally are initially set as required.

[0051] In this embodiment, a tank type SF6 circuit breaker operating at a temperature above -20°C is used.

[0052] The on / off parameters of the electric heating system include the slope intervals K1, K2, K3, K4, ..., Kn and the temperature values ​​C1, C2, C3, C4, ..., Cn corresponding to the slope intervals. The initial parameters are set based on the safe operating temperature of the circuit breaker, the power and efficiency of the electric heating cable, and the insulation conditions on site.

[0053] The external ambient temperature on that day varied from -8 degrees Celsius to -25 degrees Celsius. At 18:03:25 at night, the monitoring system detected that the slope of the real-time curve tangent of the ambient temperature was -2.18, and the real-time temperature was -13 degrees Celsius. The slope of the curve tangent was -2.18, which was within the slope interval K1. The corresponding temperature parameter C1 was -12.9 degrees Celsius. Based on the judgment, the electric heating system needs to be turned on.

[0054] At 8:25:40 the next morning, the monitoring system detected that the slope of the tangent line of the real-time curve of the ambient temperature was 2.3, and the real-time temperature was -13°C. The slope of the tangent line of the curve was 2.3, which was within the slope interval Kn. The corresponding temperature parameter Cn was -14.9°C, which met the conditions. The electric heating system was turned off and the heating of the circuit breaker was stopped. After the electric heating system was turned on, the real-time temperature curve in the circuit breaker was analyzed to see if parameter C1 was appropriate. If not, corresponding adjustments were made. After the electric heating system was turned off, the real-time temperature curve in the circuit breaker was analyzed to see if parameter C2 was appropriate. If not, corresponding adjustments were made.

[0055] As one or more implementation methods, in order to further ensure the safety and reliability of substation operation and avoid faulty operation caused by emergencies, a certain margin threshold needs to be reserved in setting the upper and lower limits of the minimum preset temperature of the circuit breaker temperature change.

[0056] This embodiment detects the environment of the substation and the real-time temperature of the circuit breaker, realizes the real-time operation status monitoring of the electric heating system, realizes digital information collection, reduces the degree of manual participation, effectively reduces the operation and maintenance costs, and improves the safety and reliability of the substation operation.

[0057] Embodiment 2

[0058] The second embodiment of the present disclosure introduces a system for monitoring the working state of an electric heating system of a substation circuit breaker, and adopts the method for monitoring the working state of an electric heating system of a substation circuit breaker introduced in the first embodiment.

[0059] like Figure 2 A substation circuit breaker electric heating system working status monitoring system shown includes:

[0060] An acquisition module is configured to acquire a substation environment temperature curve and a circuit breaker temperature curve;

[0061] The monitoring module is configured to obtain the change rate and real-time temperature of the substation ambient temperature at the current moment based on the substation ambient temperature curve, and adjust the working state of the electric heating system in real time when the change rate and real-time temperature of the substation ambient temperature both meet the conditions for the normal operation of the circuit breaker;

[0062] In the process of monitoring the working state of the electric heating system, the change rate and real-time temperature of the circuit breaker temperature at the current moment are obtained based on the circuit breaker temperature curve, and the working state of the electric heating system is optimized and adjusted in real time.

[0063] Specifically, the acquisition module uses a temperature sensor; wherein the first temperature sensor is arranged on the circuit breaker near the electric heating system, located inside the insulation layer of the electric heating system, and is used to detect the temperature value of the circuit breaker; the second temperature sensor is arranged on the substation circuit breaker in the external environment, located outside the insulation cotton of the electric heating system, and directly detects the temperature value of the external environment in which the substation is located.

[0064] In this embodiment, the electric heating system uses an electric heating tape, which is wrapped around the circuit breaker to provide uniform heating for the circuit breaker. The first temperature sensor is set as a flat structure, close to the surface of the electric heating tape, directly in contact with the electric heating tape, leaving a signal line for lead-out, and the outermost layer is a sealing insulation material, which seals the arc extinguishing chamber of the tank SF6 circuit breaker, the electric heating tape, and the temperature sensor; by collecting the value of the temperature sensor, the temperature of the electric heating tape in the sealing belt is obtained.

[0065] The monitoring module comprises a control unit and a communication unit, a display unit, an alarm unit and a current collection unit which are respectively connected to the control unit.

[0066] The current acquisition unit collects the current value of the electric heating system in real time, compares the real-time current value with the rated current value of the electric heating system, determines the working status of the electric heating system, and facilitates the subsequent optimization of the parameters of the electric heating system.

[0067] The alarm module sends an alarm signal based on the communication unit; when the external environment temperature change trend and time meet the electric heating start-up strategy, if the electric heating system is not started, the alarm is activated to notify the staff to check the cause or whether the electric heating system start-up strategy is normal; when the real-time temperature of the circuit breaker is too low, the alarm is prompted to notify the staff to further check.

[0068] The display unit displays the current equipment operating status in real time.

[0069] In this embodiment, the display unit adopts an LED display screen.

[0070] The control unit is used to receive data from each data acquisition device and transmit the data to the local host and the cloud server; in this embodiment, the control unit adopts a microcontroller, such as the STM32 minimum system.

[0071] Specifically, based on the first temperature sensor collecting the circuit breaker temperature T1, a first curve of the circuit breaker temperature T1 changing with time is obtained, and the second temperature sensor continuously collects the ambient temperature T2 to obtain a second curve of the ambient temperature T2 changing with time.

[0072] When the ambient temperature T2 drop rate and temperature meet the conditions, turn on the electric heating system for heating; continue to track and record the ambient temperature T2 and the circuit breaker temperature T1. If the temperature change of T1 does not meet expectations (the lowest value of the temperature change curve is too low, resulting in an alarm, or there is no alarm, but it is at a dangerous value, that is, near the alarm threshold), optimize the parameter conditions for turning on the electric heating system; under the same condition of the slope of the circuit breaker temperature curve, when the ambient temperature T2 is higher, turn on the electric heating system; or when the ambient temperature T2 remains unchanged, but the circuit breaker temperature curve is flatter, turn on the electric heating system.

[0073] When the ambient temperature T2 drop rate and temperature meet the conditions, turn on the electric heating system for heating; continue to track and record the ambient temperature T2 and the circuit breaker temperature T1. If the temperature change of T1 does not meet expectations (the minimum value of the temperature change curve is too high, resulting in a waste of resources), optimize the parameter conditions for turning on the electric heating system; under the same conditions of the slope of the circuit breaker temperature curve, when the ambient temperature T2 is lower, turn on the electric heating system; or when the ambient temperature T2 remains unchanged, but the slope of the circuit breaker temperature curve increases, turn on the electric heating system.

[0074] At the same time, the upper and lower limits of the minimum temperature change of the circuit breaker are evaluated, leaving a large margin to avoid system operation failures caused by emergencies.

[0075] When the rising trend of ambient temperature T2 and the temperature meet the conditions, turn off the electric heating system and stop heating. Continue to track and record ambient temperature T2 and circuit breaker temperature T1; if the temperature change of T1 does not meet expectations, optimize the parameter conditions for shutting down the electric heating system; under the same condition of the slope of the circuit breaker temperature curve, when the ambient temperature T2 is higher, turn off the electric heating system; or when the ambient temperature T2 remains unchanged but the slope of the circuit breaker temperature curve increases, turn off the electric heating system.

[0076] After learning a large amount of ambient temperature change data based on the control unit, the optimized parameter configuration is obtained. A series of safety strategies are generated according to different temperature change trends and real-time temperature values. The real-time ambient temperature collection results of each time are combined with the saved historical data to calculate the change trend within a certain period of time; according to the safety strategy obtained by learning, the corresponding results are executed, and the electric heating system should be turned on or off. At the same time, after turning on or off the electric heating system, the current sensor promptly feedbacks whether the electric heating system is working normally; for abnormal conditions, an alarm is issued in time to notify the staff for maintenance.

[0077] In addition, the substation circuit breaker electric heating system working status monitoring system also includes a power supply module connected to the acquisition module and the monitoring module.

[0078] In this embodiment, the power module adopts a 220V and two 24V redundant power supply mode, which is convenient for on-site use. Among them, one 220V power supply outputs 24V power after transformation, rectification and filtering; and the two input 24V power supplies are connected in parallel through three diodes to form one power supply to provide the system with the power required for normal operation.

[0079] The detailed working steps and principles of the substation circuit breaker electric heating system working status monitoring system are the same as the substation circuit breaker electric heating system working status monitoring method provided in the first embodiment, and will not be repeated here.

[0080] Embodiment 3

[0081] A third embodiment of the present disclosure provides a computer-readable storage medium.

[0082] A computer-readable storage medium stores a program thereon, which, when executed by a processor, implements the steps in the method for monitoring the working status of a substation circuit breaker electric heating system as described in the first embodiment of the present disclosure.

[0083] The detailed steps are the same as those of the working status monitoring method of the substation circuit breaker electric heating system provided in Example 1, and will not be repeated here.

[0084] Embodiment 4

[0085] A fourth embodiment of the present disclosure provides an electronic device.

[0086] An electronic device comprises a memory, a processor and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps in the method for monitoring the working status of an electric heating system of a substation circuit breaker as described in the first embodiment of the present disclosure are implemented.

[0087] The detailed steps are the same as those of the working status monitoring method of the substation circuit breaker electric heating system provided in Example 1, and will not be repeated here.

[0088] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.

Claims

1. A method for monitoring the working status of a substation circuit breaker electric heating system, characterized in that: The following steps are involved: Obtain substation ambient temperature curve and circuit breaker temperature curve; Based on the substation ambient temperature curve, the change rate and real-time temperature of the substation ambient temperature at the current moment are obtained. When the change rate and real-time temperature of the substation ambient temperature meet the conditions for the normal operation of the circuit breaker, the working state of the electric heating system is adjusted in real time; Monitor the working status of the electric heating system, obtain the current rate of change and real-time temperature of the circuit breaker temperature based on the circuit breaker temperature curve, and optimize and adjust the working status of the electric heating system in real time; In the process of adjusting the working state of the electric heating system in real time, if the change of the substation ambient temperature curve is positively correlated and the substation ambient temperature is greater than the preset upper limit of the ambient temperature threshold, the electric heating system is turned off; In the process of adjusting the working state of the electric heating system in real time, if the change of the substation ambient temperature curve is negatively correlated and the substation ambient temperature is less than the preset ambient temperature threshold lower limit, the electric heating system is turned on; If the current real-time temperature of the circuit breaker is lower than the lower limit of the lowest preset temperature, or the rising rate of the current circuit breaker temperature slows down, the electric heating system parameters are optimized while the electric heating system is turned on; If the current real-time temperature of the circuit breaker is higher than the lowest preset temperature upper limit, the electric heating system parameters are optimized while the electric heating system is turned on.

2. A method for monitoring the working status of a substation circuit breaker electric heating system as claimed in claim 1, characterized in that: The rate of change of the substation ambient temperature and the real-time temperature when the circuit breaker is operating normally are initially set as required.

3. A method for monitoring the working status of a substation circuit breaker electric heating system as claimed in claim 1, characterized in that: When the rate of change of the substation ambient temperature and the real-time temperature do not meet the conditions for the normal operation of the circuit breaker, it is determined whether the real-time temperature of the circuit breaker changes. If not, the electric heating system is operating abnormally, otherwise the substation ambient temperature is abnormal.

4. A monitoring system for the working status of the electric heating system of a substation circuit breaker, characterized in that: include: An acquisition module is configured to acquire a substation environment temperature curve and a circuit breaker temperature curve; The monitoring module is configured to obtain the change rate and real-time temperature of the substation ambient temperature at the current moment based on the substation ambient temperature curve, and adjust the working state of the electric heating system in real time when the change rate and real-time temperature of the substation ambient temperature both meet the conditions for the normal operation of the circuit breaker; Monitor the working status of the electric heating system, obtain the current rate of change and real-time temperature of the circuit breaker temperature based on the circuit breaker temperature curve, and optimize and adjust the working status of the electric heating system in real time; In the process of adjusting the working state of the electric heating system in real time, if the change of the substation ambient temperature curve is positively correlated and the substation ambient temperature is greater than the preset upper limit of the ambient temperature threshold, the electric heating system is turned off; In the process of adjusting the working state of the electric heating system in real time, if the change of the substation ambient temperature curve is negatively correlated and the substation ambient temperature is less than the preset ambient temperature threshold lower limit, the electric heating system is turned on; If the current real-time temperature of the circuit breaker is lower than the lower limit of the lowest preset temperature, or the rising rate of the current circuit breaker temperature slows down, the electric heating system parameters are optimized while the electric heating system is turned on; If the current real-time temperature of the circuit breaker is higher than the lowest preset temperature upper limit, the electric heating system parameters are optimized while the electric heating system is turned on.

5. A computer-readable storage medium having a program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method for monitoring the working status of a substation circuit breaker electric heating system as described in any one of claims 1 to 3 are implemented.

6. An electronic device comprising a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps in the method for monitoring the working status of the electric heating system of a substation circuit breaker as described in any one of claims 1 to 3 are implemented.

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