Ring main unit and GIS switch box intelligent inflation method and system

Abstract

The invention relates to an intelligent inflation method and system for a ring main unit and a GIS switch box, and the method comprises the steps: starting a calibration program after receiving a maintenance signal, so as to calibrate the air pressure parameter of an air pressure sensor of a circuit breaker chamber in the ring main unit, and obtaining the air pressure parameter drift degree of the air pressure sensor; if the air pressure parameter drift degree of the air pressure sensor exceeds a preset drift value, a correction program is started, and if the air pressure parameter drift degree of the air pressure sensor does not exceed the preset drift value, the correction program is not started; acquiring air pressure data of the circuit breaker chamber, and if the air pressure of the circuit breaker chamber is lower than a preset threshold value, calculating an air pressure difference value needing to be supplemented; and starting a built-in air supply device to supply air to the circuit breaker chamber according to the air pressure difference value. According to the method, an intelligent inflation method capable of being remotely operated is adopted, the safety and efficiency of inflation operation are improved, meanwhile, by calibrating and correcting air pressure parameters of the air pressure sensor, the accuracy of air pressure detection is improved, and the situation that normal operation of equipment is affected due to insufficient air pressure of insulating gas is avoided.

Description

Technical Field

[0001] This application relates to the technical field of ring main units / GIS switch cabinets, and in particular to an intelligent gas filling method, system and storage medium for ring main units and GIS switch cabinets. Background Art

[0002] When the SF6 (sulfur hexafluoride) gas (or other insulating gas) pressure in the circuit breaker chamber of a ring main unit or GIS switch cabinet is lower than the required value, gas filling is required to ensure the insulation level inside the gas tank. The traditional gas filling method is as follows: The maintenance personnel use an insulating gas cylinder near the gas tank, connect the gas tank interface and the cylinder interface through an air pipe, then open the cylinder valve to fill the gas, and determine whether the gas pressure state of the insulating gas in the gas tank meets the requirements by observing the pressure gauge on the gas tank. Since the gas tank is in a low-pressure state and the switch is in a live state during gas filling, there may be a potential risk of electrical insulation accidents in this gas filling method.

[0003] In order to ensure the personal safety of gas filling operations and keep the gas filling state under control, it is necessary to develop a remotely operable gas filling solution to reduce manual intervention and improve safety and efficiency. Summary of the Invention

[0004] The first object of this application is to provide an intelligent gas filling method for ring main units and GIS switch cabinets to improve a remotely operable gas filling solution, thereby reducing manual intervention and improving safety and efficiency.

[0005] The above first invention object of the present invention is achieved through the following technical solutions: An intelligent gas filling method for ring main units and GIS switch cabinets, the method includes: After receiving a maintenance signal from the maintenance end, start a calibration program to calibrate the pressure parameters of the pressure sensor in the circuit breaker chamber of the ring main unit / GIS switch cabinet, so as to obtain the pressure parameter drift degree of the pressure sensor; determine whether the pressure parameter drift degree exceeds a preset drift value. If the pressure parameter drift degree of the pressure sensor exceeds the preset drift value, start a correction program to correct the pressure parameters of the pressure sensor. If the pressure parameter drift degree of the pressure sensor does not exceed the preset drift value, do not start the correction program; obtain the pressure data of the circuit breaker chamber. If the pressure in the circuit breaker chamber is lower than the preset threshold, calculate the required supplementary pressure difference; start the built-in air supplement device to supplement air to the circuit breaker chamber according to the pressure difference.

[0006] Preferably, the starting a calibration program to calibrate the pressure sensor in the circuit breaker chamber of the ring main unit / GIS switch cabinet after receiving a maintenance signal from the maintenance end includes: Separate the circuit breaker chamber into an atmosphere chamber and a small chamber and isolate / connect them through a valve. Among them, the volume ratio of the atmosphere chamber to the small chamber is 9:1, and the air pressure sensor is located in the small chamber; Obtain the initial air pressure P1 of the small chamber; supplement the small chamber with a unit volume of gas V0; Calculate the theoretical total air pressure P of the small chamber after gas supplementation 理论 ; after gas supplementation, obtain the measured value of the air pressure sensor to obtain the measured air pressure P of the small chamber 实测 , and use the measured air pressure P 实测 Compare with the theoretical total air pressure P 理论 , and calculate the drift degree of the air pressure parameter.

[0007] Preferably, the specific calculation steps for calculating the theoretical total air pressure P 理论 of the small chamber after gas supplementation are as follows: Obtain the process pipeline loss coefficient η, and calculate the actual gas supplement volume V according to the process pipeline loss coefficient η and the unit volume of gas V0 supplemented to the small chamber 实际 , V 实际 = V0×η; Calculate the amount of substance n1 of the original gas in the small chamber, n1 = P1·V1 / RT, where R is the molar gas constant, with the unit J / (mol·K), T is the temperature, with the unit K, and V1 is the volume of the small chamber; Obtain the output air pressure P0 of the gas supplement device, and calculate the amount of substance n0 of the part of the supplementary gas entering the small chamber, n0 = P0·V 实际 / RT; According to the ideal gas state equation P 理论 ·V1 = (n1 + n0)·RT, calculate the theoretical total air pressure P of the small chamber after gas supplementation 理论 .

[0008] Preferably, the specific calculation steps for comparing the measured air pressure P 实测 with the theoretical total air pressure P 理论 , and calculating the drift degree of the air pressure parameter are as follows: Δ = (|P 实测 - P 理论 | / P 理论 )·100%; If Δ≥ a%, then trigger a correction program to correct the air pressure parameter of the air pressure sensor, otherwise do not trigger, where a% is a preset threshold.

[0009] Preferably, the triggering of the sensor parameter correction when Δ≥ a% includes: Obtain the sensor parameter K of the air pressure sensor before correction 旧 ; Calculate the corrected sensor parameter K 新 ,K 新 = K 旧 × (P 理论 / P 实测 ).

[0010] Preferably, after calculating the corrected sensor parameter K 新 , open the valve between the small air chamber and the large air chamber to balance the air pressure between the small air chamber and the large air chamber, and calculate the relative error P between the theoretical equilibrium pressure and the measured equilibrium pressure of the circuit breaker chamber 误差 , so as to verify the corrected sensor parameter.

[0011] Preferably, the calculation of the relative error P between the theoretical equilibrium air pressure and the measured equilibrium air pressure of the circuit breaker chamber 误差 includes: Before the air pressure between the small air chamber and the large air chamber is balanced, obtain the air pressure P of the large air chamber 2初始 , where P 2初始 = P1; After the air pressure between the small air chamber and the large air chamber is balanced, obtain the measured equilibrium air pressure P of the circuit breaker chamber after equilibrium, and calculate the theoretical equilibrium air pressure P 实测平衡 according to the conservation of the amount of substance 理论平衡 ; Calculate the relative error P 误差 =∣P 实测平衡 - P 理论平衡 ∣.

[0012] Preferably, after calculating the relative error P between the theoretical equilibrium air pressure and the measured equilibrium air pressure of the circuit breaker chamber 误差 , calculate the air pressure parameter drift degree for the second time, and the calculation steps are as follows: Δ=(P 误差 / P 理论平衡 )·100%; If Δ≥ b%, then trigger the correction program to correct the air pressure parameter of the air pressure sensor, otherwise do not trigger, where b% is a preset threshold.

[0013] Preferably, the calculation steps of calculating the theoretical equilibrium air pressure P 理论平衡 according to the conservation of the amount of substance are as follows: P 理论平衡 =( P 理论 ·V1 + P 2初始 ·V2) / V 总 ; In the formula, V1 is the volume of the small air chamber, V2 is the volume of the large air chamber, and V 总 is the volume of the circuit breaker chamber.

[0014] The second object of this application is to provide an intelligent gas filling system for ring main units and GIS switch cabinets, which is used to execute the intelligent gas filling method for ring main units and GIS switch cabinets described in any embodiment of the present invention.

[0015] The above second invention object of the present invention is achieved through the following technical solutions: An intelligent gas filling system for ring main units and GIS switch cabinets, which is used to execute the above method. The system includes: A calibration module, which is used to start a calibration program to calibrate the air pressure parameters of the air pressure sensor in the circuit breaker chamber of the ring main unit / GIS switch cabinet after receiving a maintenance signal from the maintenance end, so as to obtain the drift degree of the air pressure parameters of the air pressure sensor. An air pressure parameter correction module, which is used to judge whether the drift degree of the air pressure parameters exceeds a preset drift value. When the drift degree of the air pressure parameters of the air pressure sensor exceeds the preset drift value, it starts a correction program to correct the air pressure parameters of the air pressure sensor. If the drift degree of the air pressure parameters of the air pressure sensor does not exceed the preset drift value, the correction program is not started. An air pressure detection module, which is used to obtain the air pressure data of the circuit breaker chamber. When the air pressure of the circuit breaker chamber is lower than a preset threshold, it calculates the required supplementary air pressure difference. A gas filling execution module, which is used to start the built-in gas filling device to fill the circuit breaker chamber with gas according to the air pressure difference.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. By calibrating and correcting the air pressure parameters of the air pressure sensor, the accuracy of air pressure detection is improved, the air pressure condition of the circuit breaker chamber can be grasped more accurately, the insulation performance of the equipment is guaranteed, and the normal operation of the equipment is avoided from being affected due to insufficient air pressure of the insulating gas. 2. Automatically start the gas filling device to fill the circuit breaker chamber with gas according to the air pressure difference, reduce manual intervention, reduce the potential risk of electrical insulation accidents faced by operators, and ensure personnel safety. 3. Adopt an intelligent gas filling method that can be remotely operated, improve the safety and efficiency of gas filling operations, and solve the problems of cumbersome operation and high labor intensity of traditional gas filling methods. Description of the Drawings

[0017] Figure 1 is the overall control flowchart of the power supply method in the embodiment of this application; Figure 2 is the flowchart of automatically calibrating the air pressure parameters of the air pressure sensor in the first embodiment of this application; Figure 3 is the overall flowchart of the power supply method in the first embodiment of this application; Figure 4 is Figure 3Specific flowchart of step S1 in Figure 5 Yes Figure 4 Specific flowchart of step S14 in Figure 6 Yes Figure 3 Specific flowchart of step S2 in Figure 7 Yes Figure 6 Specific flowchart of step S22 in Specific implementation manner

[0018] Next, in combination with the attached Figures 1-7 drawings, the technical solutions in the embodiments of the present invention will be further described in detail. The described embodiments are only possible technical implementations of the present invention, but are not limited thereto. Those skilled in the art can completely combine the embodiments of the present invention, and other embodiments obtained without creative labor are also within the protection scope of the present invention.

[0019] This application mainly adopts a solution of receiving a maintenance signal to calibrate the pressure sensor and replenishing air as needed, achieving the effects of reducing the risk of inflation operation, ensuring personnel safety, and stable operation of equipment. The following is a further detailed description of this application.

[0020] Embodiment 1: Referring to Figure 1 , the intelligent inflation method for ring main unit and GIS switch cabinet provided in the embodiment of this application accurately obtains pressure data by calibrating and correcting the pressure sensor, and then controls the air replenishing device to replenish air according to the pressure difference, achieving the effects of improving the safety and accuracy of the inflation operation. This is because calibrating and correcting the pressure sensor first can ensure that the obtained pressure data is true and reliable, thereby making the air replenishing operation more accurate, reducing manual operation, and reducing risks. Referring to Figures 2-4 , the specific steps are as follows: S1: After receiving a maintenance signal from the maintenance end, start the calibration program to calibrate the pressure parameters of the pressure sensor in the circuit breaker chamber of the ring main unit / GIS switch cabinet, so as to obtain the pressure parameter drift degree of the pressure sensor. S11: Divide the circuit breaker chamber into a large air chamber and a small air chamber and isolate / connect them through a valve. Among them, the volume ratio of the large air chamber to the small air chamber is 9:1, and the pressure sensor is located in the small air chamber. Here, the division can be physically separated by components such as partitions. The partition should have good sealing performance to prevent gas leakage. An alternative separation method can also be to use a flexible sealing film for separation. The valve can be an electric ball valve, which has the characteristics of rapid switching and good sealing performance. Of course, other types of valves such as pneumatic valves can also be selected.

[0021] S12: Obtain the initial pressure P1 of the small air chamber. The BME280 pressure sensor can be used to obtain pressure data, which can convert the pressure signal into an electrical signal for subsequent parameter calibration and modification processing.

[0022] S13: Supply the unit volume gas V0 to the small air chamber. Here, the unit volume gas V0 is the gas volume fixedly filled during the self-check calibration of the pressure sensor. The gas supply device is built into the ring main unit / GIS switch cabinet and can be a small high-pressure gas cylinder. The gas cylinder stores an insulating gas, such as sulfur hexafluoride, which is connected to the small air chamber through a pipeline and a valve. It can also use an air pump for gas supply.

[0023] S14: Calculate the theoretical total air pressure P of the small air chamber after gas supply 理论 。

[0024] Refer to Figure 5 , and the specific calculation steps are as follows: S141: Obtain the process pipeline loss coefficient η, and calculate the actual gas supply volume V according to the process pipeline loss coefficient η and the unit volume gas V0 supplied to the small air chamber 实际 , V 实际 = V0×η. For example, if the process pipeline loss coefficient η = 0.98 and the unit volume gas V0 = 0.2L, then V 实际 = 0.196L, that is, when supplying the unit volume gas to the small air chamber, the actual gas volume reaching the small air chamber is 0.196L.

[0025] The process pipeline loss coefficient η can be obtained through experimental measurement, or it can refer to relevant pipeline loss standard data and be measured and stored in the control system of the ring main unit / GIS switch cabinet at the time of factory production. Measuring this coefficient through experiments can use special flow measurement equipment and pressure measurement equipment, and perform multiple measurements and calculations during the simulation of the actual gas supply process, which will not be elaborated here.

[0026] S142: Calculate the amount of substance n1 of the original gas in the small air chamber, n1 = P1·V1 / RT, where R is the molar gas constant, with the unit J / (mol·K), T is the temperature, with the unit K, and V1 is the volume of the small air chamber. For example: Suppose the initial air pressure P1 of the small air chamber = 0.05MPa = 50kPa, and the volume V1 of the small air chamber = 2L, then the amount of substance n1 of the original gas in the small air chamber = 100 / RT (kPa·L).

[0027] In this embodiment, during the calibration process, since the gas supply volume is small, the supplementary gas and the original gas are of the same substance, and the temperature change is small. Therefore, the influence of the molar gas constant and the temperature on the final result of this scheme can be ignored.

[0028] S143: Obtain the output air pressure P0 of the gas supply device, and calculate the amount of substance n0 of the supplementary gas entering the small air chamber, n0 = P0·V 实际 / RT. For example, if the output air pressure P0 = 0.1 MPa, then the amount of substance of the supplementary gas entering the small air chamber n0 = 19.6 / RT (kPa·L).

[0029] S144: According to the ideal gas state equation P 理论 ·V1 = (n1 + n0)·RT, calculate the theoretical total air pressure P of the small air chamber after air supplementation 理论 . For example, according to the results obtained in the above steps S141 - S143, that is, V1 = 2 L, n0 = 19.6 / RT (kPa·L), n1 = 100 / RT (kPa·L), assuming the temperature is 22 °C, taking the molar gas constant R of sulfur hexafluoride gas as R = 0.0060886 kg / L as an example, it can be obtained that P 理论 = 59.8 kPa.

[0030] S15: After air supplementation, obtain the measured value of the pressure sensor to obtain the measured air pressure P of the small air chamber 实测 , and compare the measured air pressure P 实测 with the theoretical total air pressure P 理论 , and calculate the air pressure parameter drift degree. The specific calculation steps are as follows: Δ = (|P 实测 - P 理论 | / P 理论 )·100%. Assuming the measured air pressure P 实测 = 59.2 kPa, then Δ = (|P 实测 - P 理论 | / P 理论 )·100% ≈ 1.003%.

[0031] S2: Determine whether the air pressure parameter drift degree exceeds the preset drift value. If the air pressure parameter drift degree of the pressure sensor exceeds the preset drift value, start the correction program to correct the air pressure parameter of the pressure sensor. If the air pressure parameter drift degree of the pressure sensor does not exceed the preset drift value, do not start the correction program.

[0032] Refer to Figure 6 , and the specific steps to trigger sensor parameter correction are as follows: S21: If Δ ≥ a%, then trigger sensor parameter correction. Where a% is the preset threshold.

[0033] Specifically, if Δ≥a%, the correction program is triggered to correct the air pressure parameter of the air pressure sensor; otherwise, it is not triggered. This preset threshold a% can be adjusted according to the actual situation. For example, a suitable value can be obtained through statistical analysis of experimental data. In this embodiment, the preset threshold of a% is set to 1%. Since the comparison of the measured value of the air pressure sensor involves real-time data of the sensor, there may be more noise or short-term fluctuations. Therefore, a slightly larger error threshold of 1% is allowed to avoid frequent triggering of corrections and affecting the system stability.

[0034] According to the calculation result of step S15 above, the air pressure parameter drift Δ≈1.003%>1%. Therefore, the correction program is triggered to correct the air pressure parameter of the air pressure sensor. Specifically, it includes obtaining the sensor parameter K of the air pressure sensor before correction. 旧 Calculate the corrected sensor parameter K. 新 , K 新 = K 旧 ×(P 理论 / P 实测 ). Such a calculation method can reasonably correct the sensor parameter according to the air pressure parameter drift. Specifically, referring to P 理论 = 59.8kPa and P 实测 = 59.2kPa in the above embodiment and substituting the results, the corrected sensor parameter K 新 = 1.0101K 旧 can be obtained, that is, the parameter of the air pressure sensor after correction is 1.0101K. 旧 .

[0035] In the above, K is defined as: the sensitivity of the air pressure sensor, that is, the output change corresponding to the unit pressure change (such as voltage, digital signal, etc.). For example: if the output of a certain air pressure sensor is 0 - 5V corresponding to 0 - 1MPa, then K = 5V / MPa}, indicating that every 1MPa pressure change corresponds to a 5V voltage change. When the sensitivity of the sensor changes due to factors such as aging and temperature drift, by correcting the K value, the corresponding relationship between the output signal and the actual pressure can be calibrated.

[0036] S22: Calculate the corrected sensor parameter K. 新 After that, open the valve between the small air chamber and the large air chamber, make the air pressure between the small air chamber and the large air chamber balanced, and calculate the relative error P 误差 between the theoretical balanced pressure and the measured balanced pressure of the circuit breaker chamber, so as to verify the corrected sensor parameter. In this embodiment, opening the valve can be realized by an electric control device, which can accurately control the opening time and speed of the valve.

[0037] Specifically, referring to Figure 7, calculate the relative error P between the theoretical equilibrium air pressure and the measured equilibrium air pressure of the circuit breaker chamber 误差 Specifically, it includes: S221: Before the air pressure between the small air chamber and the large air chamber reaches equilibrium, obtain the air pressure P of the large air chamber 2初始 , where P 2初始 = P1. Before the air pressure between the small air chamber and the large air chamber reaches equilibrium, that is, before calibrating and correcting the air pressure sensor in the small air chamber, the air pressure in the small air chamber and the air pressure in the large air chamber are both equal to the air pressure in the circuit breaker chamber.

[0038] S222: After the air pressure between the small air chamber and the large air chamber reaches equilibrium, obtain the measured equilibrium air pressure P of the circuit breaker chamber after equilibrium 实测平衡 , calculate the theoretical equilibrium air pressure P according to the conservation of the amount of substance 理论平衡 . Calculate the theoretical equilibrium air pressure P according to the conservation of the amount of substance 理论平衡 The calculation steps of P are as follows: P 理论平衡 = (P 理论 ·V1 + P 2初始 ·V2) / V 总 ; In the formula, V1 is the volume of the small air chamber, V2 is the volume of the large air chamber, and V 总 is the volume of the circuit breaker chamber. These volume data can be accurately obtained when designing the circuit breaker chamber.

[0039] According to the above steps, it can be known that P 理论 = 59.8kPa, P 2初始 = P1 = 50KPa, V1 = 2L, V2 = 9V1 = 18L, then V 总 = 20L. Therefore, P 理论平衡 = (119.6 + 900) / 20 = 50.98kPa.

[0040] S223: Calculate the relative error P 误差 = ∣P 实测平衡 - P 理论平衡 ∣. High-precision barometers or pressure transmitters can also be used to obtain air pressure data. Assume that the measured equilibrium air pressure P of the circuit breaker chamber after equilibrium 实测平衡 = 50.92kPa, then the relative error P 误差 = 0.06kPa.

[0041] S23: After calculating the relative error P between the theoretical equilibrium air pressure and the measured equilibrium air pressure of the circuit breaker chamber 误差 , calculate the air pressure parameter drift degree for the second time, and the calculation steps are as follows: Δ = (P 误差 / P 理论平衡) · 100%; if Δ ≥ b%, the correction program is triggered to correct the air pressure parameter of the air pressure sensor, otherwise it is not triggered, where b% is a preset threshold. The preset threshold b% can also be adjusted and optimized according to the actual situation. For example, a suitable value can be obtained through statistical analysis of experimental data. In this embodiment, the preset threshold of b% is set to 0.5% because the theoretical equilibrium air pressure comparison may be used to verify the loss coefficient of the system. This part may belong to the internal theoretical calculation of the system and requires higher precision to ensure the accuracy of the data. Therefore, a more stringent threshold of 0.5% is set.

[0042] Substitute the relative error P calculated in the above step S233 误差 = 0.06 kPa into Δ = (P 误差 / P 理论平衡 ) · 100% to obtain Δ ≈ 0.12% < 0.5%. The error is within 0.5%, so the loss coefficient does not need to be updated. If Δ ≥ 0.5%, the correction program is started again for parameter correction. The correction method is the same as the calculation method and correction logic in the above step S21, and the corrected air pressure parameter is the final air pressure parameter for calibrating the air pressure sensor this time.

[0043] S3: Obtain the air pressure data of the circuit breaker chamber. When the air pressure in the circuit breaker chamber is lower than the preset threshold, calculate the required air pressure difference to be supplemented. The acquisition of air pressure data still relies on the calibrated and corrected air pressure sensor. The preset threshold can be set according to the actual operation requirements of the ring main unit / GIS switch cabinet. The calculation of the air pressure difference can be achieved through subtraction operations. For example, subtract the currently measured air pressure value from the preset threshold.

[0044] S4: Start the built-in air replenishment device to replenish air to the circuit breaker chamber according to the air pressure difference. The start of the air replenishment device can be achieved through the control system in the ring main unit / GIS switch cabinet. After the control system receives the calculated air pressure difference, it controls the air replenishment speed and air replenishment time of the air replenishment device according to the size of the difference. After the air replenishment is completed, close the air replenishment device and the air replenishment inlet valve of the circuit breaker chamber, and keep the pressure of the circuit breaker chamber for 5 minutes. After the pressure holding ends, retest the air pressure of the circuit breaker chamber. If the air pressure is normal, the air replenishment ends. If the air pressure does not meet the requirements, recalculate the air pressure difference and start the air replenishment device to replenish air. The implementation principle of this embodiment is that through the calibration, correction and calculation steps, this intelligent air filling method can accurately obtain the air pressure data of the circuit breaker chamber, effectively solve the problem of inaccurate measurement caused by parameter drift of the air pressure sensor in the traditional air filling method. At the same time, according to the accurate air pressure data, air is replenished as needed, avoiding the potential risk of electrical insulation accidents caused by manual operation, greatly improving the safety and efficiency of the air filling operation, ensuring the stable operation of the ring main unit and GIS switch cabinet, reducing the probability of electrical accidents caused by insufficient air pressure, and reducing economic losses.

[0045] Embodiment 2: A smart gas filling system for a ring main unit and a GIS switch cabinet, which is used to execute the above gas filling method. The system includes: A calibration module, which is used to start a calibration program to calibrate the air pressure parameters of the air pressure sensor in the circuit breaker chamber of the ring main unit / GIS switch cabinet after receiving a maintenance signal from the maintenance end, so as to obtain the drift degree of the air pressure parameters of the air pressure sensor; An air pressure parameter correction module, which is used to judge whether the drift degree of the air pressure parameters exceeds a preset drift value. When the drift degree of the air pressure parameters of the air pressure sensor exceeds the preset drift value, it starts a correction program to correct the air pressure parameters of the air pressure sensor. If the drift degree of the air pressure parameters of the air pressure sensor does not exceed the preset drift value, the correction program is not started; An air pressure detection module, which is used to obtain the air pressure data of the circuit breaker chamber. When the air pressure in the circuit breaker chamber is lower than a preset threshold, it calculates the required supplementary air pressure difference; A gas filling execution module, which is used to start the built-in gas filling device to fill the circuit breaker chamber with gas according to the air pressure difference.

[0046] Embodiment 3: The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it realizes the above-mentioned smart gas filling method for the ring main unit and the GIS switch cabinet. To avoid repetition, it will not be elaborated here.

[0047] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0048] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An intelligent gas filling method for a ring main unit and a GIS switch cabinet, characterized in that, The method includes: After receiving a maintenance signal from the maintenance terminal, starting a calibration program to calibrate the air pressure parameter of the air pressure sensor in the circuit breaker chamber of the ring main unit / GIS switch cabinet, so as to obtain the drift degree of the air pressure parameter of the air pressure sensor; Judging whether the drift degree of the air pressure parameter exceeds a preset drift value. If the drift degree of the air pressure parameter of the air pressure sensor exceeds the preset drift value, starting a correction program to correct the air pressure parameter of the air pressure sensor. If the drift degree of the air pressure parameter of the air pressure sensor does not exceed the preset drift value, the correction program is not started; Obtaining the air pressure data of the circuit breaker chamber. When the air pressure of the circuit breaker chamber is lower than a preset threshold, calculating the required supplementary air pressure difference; Starting the built-in air filling device to fill air into the circuit breaker chamber according to the air pressure difference.

2. The method according to claim 1, characterized in that The starting a calibration program to calibrate the air pressure sensor in the circuit breaker chamber of the ring main unit / GIS switch cabinet after receiving a maintenance signal from the maintenance terminal includes: Dividing the circuit breaker chamber into an atmosphere chamber and a small air chamber and isolating / connecting them through a valve. Among them, the volume ratio of the atmosphere chamber to the small air chamber is 9:1, and the air pressure sensor is located in the small air chamber; Obtaining the initial air pressure P1 of the small air chamber; Supplying a unit volume of gas V0 to the small air chamber; Calculate the theoretical total air pressure P of the small air chamber after air supplement 理论 ; After replenishing air, obtain the measured value of the pressure sensor, and thereby obtain the measured air pressure P of the small air chamber 实测 , and compare the measured air pressure P 实测 with the theoretical total air pressure P 理论 , and calculate the drift degree of the air pressure parameter 3. The method according to claim 2, wherein The theoretical total air pressure P of the small air chamber after calculating the supplementary air is as follows: 理论 The specific calculation steps are as follows: Obtain the process pipeline loss coefficient η, and calculate the actual gas replenishment volume V according to the process pipeline loss coefficient η and the unit volume of gas V0 replenished to the small air chamber 实际 , V 实际 = V0 × η; Calculating the amount of substance n1 of the original gas in the small air chamber, n1 = P1·V1 / RT, where R is the molar gas constant, the unit is J / (mol·K), T is the temperature, the unit is K, and V1 is the volume of the small air chamber; Obtain the output air pressure P0 of the air supplement device, and calculate the amount of substance n0 of the supplementary gas entering the small air chamber, where n0 = P0·V 实际 / RT; According to the ideal gas state equation P 理论 ·V1 = (n1 + n0)·RT, calculate the theoretical total air pressure P of the small air chamber after air replenishment 理论 .

4. The method according to claim 3, wherein The measured air pressure P 实测 is compared with the theoretical total air pressure P 理论 , and the specific calculation steps for calculating the drift degree of the air pressure parameter are as follows: Δ = (|P 实测 - P 理论 | / P 理论 ) · 100%; If Δ≥ a%, triggering a correction program to correct the air pressure parameter of the air pressure sensor, otherwise not triggering, where a% is a preset threshold.

5. The method according to claim 4, wherein The triggering of the sensor parameter correction when Δ≥ a% includes: Obtain the sensor parameter K of the barometric pressure sensor before correction 旧 ; Calculate the corrected sensor parameter K 新 , K 新 = K 旧 × (P 理论 / P 实测 ).

6. The method according to claim 5, characterized in that, Calculate the corrected sensor parameter K 新 After that, open the valve between the small air chamber and the large air chamber to balance the air pressure between the small air chamber and the large air chamber, and calculate the relative error P between the theoretical equilibrium pressure and the measured equilibrium pressure of the circuit breaker chamber 误差 so as to verify the corrected sensor parameter 7. The method according to claim 6, characterized in that The relative error P between the theoretical equilibrium air pressure and the measured equilibrium air pressure of the circuit breaker chamber 误差 includes: Before the air pressure balance between the small air chamber and the large air chamber, obtain the air pressure P of the large air chamber 2初始 , where P 2初始 = P1; After the air pressure between the small air chamber and the large air chamber reaches equilibrium, obtain the measured equilibrium air pressure P of the circuit breaker chamber after equilibrium 实测平衡 , and calculate the theoretical equilibrium air pressure P according to the conservation of the amount of substance 理论平衡 ; Calculate the relative error P 误差 = |P 实测平衡 - P 理论平衡 |.

8. The method according to claim 6, characterized in that, The relative error P between the theoretical equilibrium air pressure and the measured equilibrium air pressure of the calculated circuit breaker chamber 误差 After that, the air pressure parameter drift degree is calculated for the second time, and the calculation steps are as follows: Δ = (P 误差 / P 理论平衡 ) · 100%; If Δ≥ b%, triggering the correction program again to correct the air pressure parameter of the air pressure sensor, otherwise not triggering, where b% is a preset threshold.

9. The method according to claim 7, wherein The calculation of the theoretical equilibrium gas pressure P according to the conservation of the amount of substance 理论平衡 is carried out as follows: P 理论平衡 = (P 理论 ·V1 + P 2初始 ·V2) / V 总 ; Wherein, V 1为 is the volume of the small air chamber, V2 is the volume of the large air chamber, and V 总 is the volume of the breaker chamber.

10. An inflation system for performing the method according to any one of claims 1-9 above, characterized in that, Includes: A calibration module, configured to start a calibration program to calibrate the air pressure parameter of the air pressure sensor in the circuit breaker chamber of the ring main unit / GIS switch cabinet after receiving a maintenance signal from the maintenance terminal, so as to obtain the drift degree of the air pressure parameter of the air pressure sensor; An air pressure parameter correction module, configured to judge whether the drift degree of the air pressure parameter exceeds a preset drift value. When the drift degree of the air pressure parameter of the air pressure sensor exceeds the preset drift value, starting a correction program to correct the air pressure parameter of the air pressure sensor. If the drift degree of the air pressure parameter of the air pressure sensor does not exceed the preset drift value, the correction program is not started; An air pressure detection module, configured to obtain the air pressure data of the circuit breaker chamber. When the air pressure of the circuit breaker chamber is lower than a preset threshold, calculating the required supplementary air pressure difference; An air filling execution module, configured to start the built-in air filling device to fill air into the circuit breaker chamber according to the air pressure difference.

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