A method for altitude correction of combined gap discharge voltage in high-altitude live-line working

Abstract

This application provides a method for altitude correction of discharge voltage in combined gaps used for live-line working at high altitudes. The method includes: acquiring discharge characteristic curves corresponding to discharge voltage values ​​of different sub-gap lengths at the current altitude; determining the minimum discharge voltage location based on the discharge characteristic curves; and determining the operating impulse discharge voltage value of the combined gap under standard atmospheric conditions based on the minimum discharge voltage location. The method proposed in this application fully considers the difference in discharge characteristics between combined gaps and long gaps, improving the accuracy of altitude correction results for discharge voltage in combined gaps used for live-line working at high altitudes, thereby effectively improving the reliability of insulation strength prediction for combined gaps used for live-line working at high altitudes.

Description

Technical Field

[0001] This application relates to the field of high-altitude air gap discharge and insulation strength prediction, and in particular to a method for altitude correction of combined gap discharge voltage in high-altitude live-line work. Background Technology

[0002] Live-line working, a key method for the operation and maintenance of transmission lines, can significantly improve the reliability of power supply. During equipotential live-line working, the worker acts as a suspended conductor as they enter the equipotential zone, dividing the conductor-tower gap into a combined conductor-worker-tower gap. This significantly alters the insulation structure and discharge characteristics of the gap. In a certain region, many existing and under-construction transmission lines pass through high-altitude areas, making live-line working a crucial support for ensuring the safe and stable operation of these lines. However, in high-altitude environments, the insulation performance of air gaps decreases, and the discharge characteristics of combined gaps differ significantly from those under standard atmospheric conditions, leading to a substantial increase in safety risks associated with live-line working at high altitudes. The operating impulse discharge voltage of combined gaps for live-line working is an important safety parameter for judging the insulation performance of gaps. Currently, the discharge voltage of air gaps at high altitudes is mainly obtained by altitude correction based on the discharge voltage under standard atmospheric conditions. However, the existing altitude correction methods are limited to long air gaps and do not consider the influence of suspended conductors on the discharge characteristics of air gaps. Therefore, they cannot be applied to the prediction of discharge voltage of combined gaps in high-altitude areas, and cannot accurately obtain the safety parameters for live-line work in high-altitude areas. This leads to significant safety risks and uncertainties in engineering projects, and restricts the standardization and refined application of live-line work technology in high-altitude areas. Summary of the Invention

[0003] This application provides a method for altitude correction of combined gap discharge voltage in high-altitude live-line working. To solve the above-mentioned technical problems, this application adopts the following technical method:

[0004] In a first aspect, this application provides a method for altitude correction of combined gap discharge voltage in high-altitude live-line working, including:

[0005] Obtain the discharge characteristic curves of different sub-gap lengths at the current altitude;

[0006] Based on the discharge characteristic curve, determine the location of the minimum discharge voltage;

[0007] Based on the minimum discharge voltage location, the operating impulse discharge voltage value of the live-line working combination gap under standard atmospheric conditions is determined.

[0008] Optionally, the process of determining the discharge characteristic curve includes the following steps:

[0009] At the current altitude, with a fixed total clearance length, different sub-clearance lengths are set.

[0010] Conduct live-line working combined gap operation impulse discharge characteristic test to determine the discharge characteristic curves of discharge voltage values ​​corresponding to different sub-gap lengths at the current altitude.

[0011] Optionally, determining the minimum discharge voltage location based on the discharge characteristic curve includes:

[0012] Based on the discharge characteristic curve, determine the minimum value of the operating impulse discharge voltage;

[0013] The sub-gap length corresponding to the minimum value of the operational impulse discharge voltage is taken as the position of the minimum discharge voltage.

[0014] Optionally, determining the operating impulse discharge voltage value of the live-line working combination gap under standard atmospheric conditions based on the minimum discharge voltage location includes:

[0015] Based on the minimum discharge voltage position, a test value of the operating impulse discharge voltage that is lower than the minimum discharge voltage position is determined as the first operating impulse discharge voltage before the minimum discharge voltage position of the gap;

[0016] Based on the minimum discharge voltage position, a test value of the operating impulse discharge voltage greater than the minimum discharge voltage position is determined as the second operating impulse discharge voltage after the minimum discharge voltage position of the gap;

[0017] Based on the first operational impulse discharge voltage, the minimum operational impulse discharge voltage, and the second operational impulse discharge voltage, the operational impulse discharge voltage value of the live-line working combination gap under standard atmospheric conditions is determined.

[0018] Optionally, determining the operating impulse discharge voltage value of the live-line working combination gap under standard atmospheric conditions based on the first operating impulse discharge voltage, the minimum operating impulse discharge voltage, and the second operating impulse discharge voltage includes:

[0019] Substituting the first operational impulse discharge voltage into the calculation formula for the first altitude factor correction, the first discharge voltage altitude correction factor before the minimum discharge voltage position is calculated:

[0020] ;

[0021] In the formula, This is the altitude correction factor for the first discharge voltage. This is the first operating impulse discharge voltage. This is the current altitude;

[0022] Substituting the second operational impulse discharge voltage into the calculation formula for the second altitude factor, the second discharge voltage altitude correction factor after the minimum discharge voltage position is calculated:

[0023] ;

[0024] In the formula, This is the altitude correction factor for the second discharge voltage. This is the second operating impulse discharge voltage;

[0025] Substituting the minimum value of the operational impact discharge voltage into the first altitude factor correction formula or the second altitude factor correction formula, the third discharge voltage altitude correction factor at the minimum discharge voltage position can be obtained.

[0026] Based on the first discharge voltage altitude correction factor, the second discharge voltage altitude correction factor, and the third discharge voltage altitude correction factor, the operating impulse discharge voltage value of the live-line working combination gap under standard atmospheric conditions is determined.

[0027] Optionally, the operating impulse discharge voltage value of the live-line working combination gap under standard atmospheric conditions includes a first discharge voltage correction value before the minimum discharge voltage position, a second discharge voltage correction value after the minimum discharge voltage position, and a third discharge voltage correction value at the minimum discharge voltage position; the operating impulse discharge voltage value of the live-line working combination gap under standard atmospheric conditions is determined based on the first discharge voltage altitude correction factor, the second discharge voltage altitude correction factor, and the third discharge voltage altitude correction factor; including:

[0028] Substituting the first discharge voltage altitude correction factor into the first altitude correction model, the first discharge voltage correction value is calculated:

[0029] ;

[0030] In the formula, This is the first discharge voltage correction value. This represents the voltage drop of the discharge channel in the sub-gap;

[0031] Substituting the second discharge voltage altitude correction factor into the second altitude correction model, the second discharge voltage correction value is calculated:

[0032] ;

[0033] In the formula, This is the second discharge voltage correction value;

[0034] The third discharge voltage altitude correction factor, calculated by the first altitude factor correction formula, is substituted into the first altitude correction model for calculation, or the third discharge voltage altitude correction factor, calculated by the second altitude factor correction formula, is substituted into the second altitude correction model for calculation, to generate the third discharge voltage correction value.

[0035] Secondly, this application also provides a computer system, comprising:

[0036] Memory is used to store instructions that can be executed by the processor;

[0037] A processor for executing the instructions to implement the method as described in any of the first aspects.

[0038] Thirdly, this application also provides a computer-readable medium storing computer program code that, when executed by a processor, implements the method as described in any of the first aspects.

[0039] This application has the following beneficial effects:

[0040] The method proposed in this application fully considers the difference in discharge characteristics between combined gaps and long gaps, improves the accuracy of altitude correction results for discharge voltage of combined gaps in high-altitude live-line work, and thus effectively enhances the reliability of insulation strength prediction for combined gaps in high-altitude live-line work. Attached Figure Description

[0041] Figure 1 A schematic flowchart illustrating a method for altitude correction of combined gap discharge voltage in high-altitude live-line working, provided in an embodiment of this application;

[0042] Figure 2 A schematic diagram of the live-line working combination gap provided in an embodiment of this application;

[0043] Figure 3 The high-altitude live-line working combination gap discharge characteristic curve provided in the embodiments of this application;

[0044] Figure 4 The diagram shows the elevation correction result of the live-line working combination gap operation impulse discharge voltage provided in the embodiment of this application. Detailed Implementation

[0045] To facilitate understanding by those skilled in the art, the present application will be further described below in conjunction with embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present application.

[0046] To solve the above technical problems, such as Figure 1 As shown, this application proposes a method for altitude correction of combined gap discharge voltage in high-altitude live-line working, including:

[0047] Step S101: Obtain the discharge characteristic curves of discharge voltage values ​​corresponding to different sub-gap lengths at the current altitude;

[0048] At the current altitude of X m, conduct impulse discharge characteristic tests on live-line working combined gap operation, with the gap structure as follows. Figure 2 As shown, the presence of the worker divides the gap from the conductor-tower gap into two sub-gap gaps: the conductor-worker gap (length s1) and the worker-tower gap (length s2). Within the combined gap, changes in the worker's position (changes in s1) also cause changes in the gap discharge voltage U50. Therefore, to study this combined gap, the total gap length d is fixed, and different sub-gap lengths s1 are set to obtain the operational impulse discharge voltage corresponding to different s1 values. Discharge characteristic curves were obtained for discharge voltage values ​​corresponding to different inter-gap lengths at the current altitude. ,like Figure 3 As shown.

[0049] Step S102: Determine the location of the minimum discharge voltage based on the discharge characteristic curve;

[0050] By analyzing the discharge characteristic curve, the minimum operating impulse discharge voltage can be obtained. The sub-gap length s1 corresponding to the minimum operating impulse discharge voltage is the position of the minimum discharge voltage of the live-line working combination gap under this altitude and gap structure.

[0051] Step S103: Based on the minimum discharge voltage position, determine the operating impulse discharge voltage value of the live-line working combination gap under standard atmospheric conditions.

[0052] Once the minimum discharge voltage position is determined, the test value of the operational impulse discharge voltage below this minimum discharge voltage position can be used as the first operational impulse discharge voltage before the minimum discharge voltage position of the gap. The test value of the operating impulse discharge voltage at the minimum discharge voltage position is taken as the second operating impulse discharge voltage after the minimum discharge voltage position of the gap. .

[0053] Substituting the first operational impulse discharge voltage into the first altitude factor correction formula, the first discharge voltage altitude correction factor before the minimum discharge voltage position is calculated as follows:

[0054] (1)

[0055] In the formula, The altitude correction factor for the first discharge voltage; This is the current altitude;

[0056] Substituting the second operational impulse discharge voltage into the calculation formula for the second altitude factor correction, the second discharge voltage altitude correction factor after the minimum discharge voltage position is calculated, as shown in the following formula:

[0057] (2)

[0058] In the formula, This is the altitude correction factor for the second discharge voltage. This is the second operating impulse discharge voltage;

[0059] Substituting the minimum operating impulse discharge voltage into the calculation formula for the first altitude factor or the second altitude factor, the third discharge voltage altitude correction factor at the location of the minimum discharge voltage can be obtained. .

[0060] Before the minimum discharge voltage position, the discharge voltage of the gap is mainly affected by the discharge voltage of sub-gap 2. Therefore, the test discharge voltage value should first be subtracted from the voltage drop of the discharge channel in sub-gap 1. After altitude correction, this value should be added back to the voltage drop of the discharge channel in sub-gap 1 to obtain the corrected discharge voltage value before the minimum discharge voltage position. Based on this, the discharge voltage before the minimum discharge voltage position... and the first discharge voltage altitude correction factor Substituting into the first altitude correction model, the first discharge voltage correction value is calculated. That is, the operating impulse discharge voltage corrected to the standard atmospheric environment, as shown in the following formula:

[0061] (3)

[0062] (4)

[0063] In the formula, The voltage drop of the discharge channel in sub-gap 1 is kV; s 1 represents the length of the sub-gap 1, in meters; The initial value of the electric field in the discharge channel is taken as 400 kV / m; The stable electric field strength in the discharge channel is taken as 50 kV / m; Let be a length constant, taken as 0.75m.

[0064] Altitude correction factor for the second discharge voltage Substituting into the second altitude correction model, the second discharge voltage correction value is calculated as shown in the following formula:

[0065] (5)

[0066] In the formula, This is the second discharge voltage correction value;

[0067] The third discharge voltage altitude correction factor, calculated by the first altitude correction model, is substituted into the first altitude factor correction formula for calculation, or the third discharge voltage altitude correction factor, calculated by the second altitude factor correction formula, is substituted into the second altitude correction model for calculation, to generate the third discharge voltage correction value.

[0068] Based on the above calculations, the discharge voltage correction values ​​for different gap lengths can be obtained. Combining these values ​​yields the operating impulse discharge voltage value for the combined gap during live-line working under standard atmospheric conditions. Figure 4 As shown.

[0069] In summary, the method proposed in this application establishes an altitude correction model suitable for combined gaps used in live-line work at high altitudes by comprehensively considering altitude, the characteristics of impulse discharge in combined gap operations, and the formation mechanism of the minimum discharge voltage of combined gaps. By using different altitude correction factors and correction models before and after the minimum voltage position, the differences in discharge characteristics between combined gaps and long gaps are fully considered, improving the accuracy of altitude correction results for discharge voltage of combined gaps used in live-line work at high altitudes, thereby effectively enhancing the reliability of insulation strength prediction for combined gaps used in live-line work at high altitudes.

[0070] In some embodiments, this application also provides a computer system including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0071] This application also provides a computer-readable storage medium for storing a computer program. This computer-readable storage medium can be applied to a computer device, and the computer program causes the computer device to execute the corresponding processes in the methods described above in the embodiments of this application; for brevity, further details are omitted here.

[0072] The above embodiments are preferred implementations of this application. In addition, this application can be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this application.

[0073] To facilitate understanding by those skilled in the art of the improvements made by this application compared to the prior art, some of the accompanying drawings and descriptions have been simplified, and for clarity, some other elements have been omitted from this application. Those skilled in the art should realize that these omitted elements may also constitute the content of this application.

Claims

1. A method for altitude correction of combined gap discharge voltage in high-altitude live-line working, characterized in that, include: Obtain the discharge characteristic curves corresponding to different sub-gap lengths at the current altitude; Based on the discharge characteristic curve, determine the location of the minimum discharge voltage; Based on the minimum discharge voltage position, a test value of the operating impulse discharge voltage that is lower than the minimum discharge voltage position is determined as the first operating impulse discharge voltage before the minimum discharge voltage position of the gap; Based on the minimum discharge voltage position, a test value of the operating impulse discharge voltage greater than the minimum discharge voltage position is determined as the second operating impulse discharge voltage after the minimum discharge voltage position of the gap; Substituting the first operational impulse discharge voltage into the calculation formula for the first altitude factor correction, the first discharge voltage altitude correction factor before the minimum discharge voltage position is calculated: ； In the formula, This is the altitude correction factor for the first discharge voltage. The voltage is the first operational impulse discharge voltage, and X is the current altitude. Substituting the second operational impulse discharge voltage into the calculation formula for the second altitude factor, the second discharge voltage altitude correction factor after the minimum discharge voltage position is calculated: ； In the formula, This is the altitude correction factor for the second discharge voltage. This is the second operating impulse discharge voltage; Substituting the minimum value of the operational impact discharge voltage into the first altitude factor correction formula or the second altitude factor correction formula, the third discharge voltage altitude correction factor at the minimum discharge voltage position can be obtained. Based on the first discharge voltage altitude correction factor, the second discharge voltage altitude correction factor, and the third discharge voltage altitude correction factor, the operating impulse discharge voltage value of the live-line working combination gap under standard atmospheric conditions is determined.

2. The method according to claim 1, characterized in that, The process of determining the discharge characteristic curve includes the following steps: At the current altitude, with a fixed total clearance length, different sub-clearance lengths are set. Conduct live-line working combined gap operation impulse discharge characteristic test to determine the discharge characteristic curves of different sub-gap lengths corresponding to the discharge voltage values ​​at the current altitude.

3. The method according to claim 2, characterized in that, Determining the minimum discharge voltage location based on the discharge characteristic curve includes: Based on the discharge characteristic curve, determine the minimum value of the operating impulse discharge voltage; The sub-gap length corresponding to the minimum value of the operational impulse discharge voltage is taken as the position of the minimum discharge voltage.

4. The method according to claim 3, characterized in that, The operational impulse discharge voltage value of the live-line working combination gap under standard atmospheric conditions includes a first discharge voltage correction value before the minimum discharge voltage position, a second discharge voltage correction value after the minimum discharge voltage position, and a third discharge voltage correction value at the minimum discharge voltage position; the operational impulse discharge voltage value of the live-line working combination gap under standard atmospheric conditions is determined based on the first discharge voltage altitude correction factor, the second discharge voltage altitude correction factor, and the third discharge voltage altitude correction factor. include: Substituting the first discharge voltage altitude correction factor into the first altitude correction model, the first discharge voltage correction value is calculated: ； In the formula, This is the first discharge voltage correction value. This represents the voltage drop of the discharge channel in the sub-gap; Substituting the second discharge voltage altitude correction factor into the second altitude correction model, the second discharge voltage correction value is calculated: ； In the formula, This is the second discharge voltage correction value; The third discharge voltage altitude correction factor, calculated by the first altitude factor correction formula, is substituted into the first altitude correction model for calculation, or the third discharge voltage altitude correction factor, calculated by the second altitude factor correction formula, is substituted into the second altitude correction model for calculation, to generate the third discharge voltage correction value.

5. A computer system, characterized in that, include: Memory is used to store instructions that can be executed by the processor; A processor for executing the instructions to implement the method as described in any one of claims 1 to 4.

6. A computer-readable medium, characterized in that, The system contains computer program code that, when executed by a processor, implements the method as described in any one of claims 1 to 4.

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