Cable local insulation breakdown semi-stable arc modeling method and device and electronic equipment

Abstract

The invention provides a cable local insulation breakdown semi-stable arc modeling method and device and electronic equipment. The method comprises the following steps: acquiring a transient oscillation arc waveform based on a periodic pulse function in a cable; acquiring a steady-state breakdown arc waveform based on an arc gap energy balance equation in the cable; calculating the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the breakdown voltage of the insulating layer of the cable; combining the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the switching time to obtain a semi-steady-state arc waveform; the semi-stable arc waveform is used to describe arc conductance at different moments in time. According to the method, the semi-stable arc model for describing the local insulation breakdown process of the cable is established, so that the defects that an existing model is poor in interpretability and parameters are difficult to set can be overcome, a theoretical basis is provided for research on early fault early warning and fault identification of the cable, and the distribution network accident risk and the line hidden danger are reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of detection technology, and in particular to a method, device and electronic equipment for modeling a semi-steady-state arc caused by local insulation breakdown of a cable. Background Art

[0002] The main line type of urban distribution network is cable. The reliable operation of cable is of great significance to the safety of urban distribution network. Urban distribution network usually uses cross-linked polyethylene cable. Cross-linked polyethylene cable has a multi-layer coaxial insulation structure. It is difficult to break down at one time after a fault occurs. As a result, the cable fault has intermittent and high resistance fault characteristics in the early stage, and it is accompanied by a long development process.

[0003] Existing fault detection and protection methods are difficult to quickly handle cable faults in their infancy, resulting in permanent grounding faults and even further causing fires in cable trenches, seriously affecting the safe and reliable power supply of distribution networks. Summary of the invention

[0004] The present disclosure provides a method, device and electronic equipment for modeling a semi-steady-state arc of local insulation breakdown of a cable to solve the above-mentioned technical problems.

[0005] According to a first aspect of the present disclosure, a method for modeling a semi-steady-state arc of local insulation breakdown of a cable is provided, the method comprising:

[0006] Obtaining transient oscillation arc waveform based on periodic pulse function in the cable;

[0007] Obtain the steady-state breakdown arc waveform based on the arc gap energy balance equation in the cable;

[0008] Calculating the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the insulation breakdown voltage of the cable;

[0009] The transient oscillation arc waveform and the steady-state breakdown arc waveform are combined according to the switching moment to obtain a semi-steady-state arc waveform; the semi-steady-state arc waveform is used to describe the arc conductance at different moments.

[0010] Optionally, the transient oscillation arc waveform is expressed as:

[0011]

[0012] W(i)=θ[t0(i)+3σ]-θ[t0(i)-3σ];

[0013]

[0014] In the formula, G s(t) represents the transient oscillation arc waveform in the cable; W(i) represents the rectangular window function; G[t0(i)] represents the pulse function; i represents the number of the rectangular window function, and its value range is [1, n]; t represents the time corresponding to the pulse function; t0 represents the time delay parameter, which is used to control the oscillation symmetry position; σ represents the standard deviation, which is used to control the width of the oscillation pulse; G0 represents the amplitude of the pulse function.

[0015] Optionally, the steady-state breakdown arc waveform is expressed as:

[0016]

[0017] Where, u represents arc voltage; i represents arc current; g represents arc conductivity; D represents arc channel diameter; N d represents the heat dissipation constant of the arc area; l represents the arc length; τ D represents the arc time constant; σ0 represents the volume conductivity constant of the arc.

[0018] Optionally, calculating the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the insulation breakdown voltage of the cable includes:

[0019] Obtain the breakdown voltage of the local insulation defect area, the breakdown voltage of the remaining insulation layer, the angular frequency and input voltage of the power system operation;

[0020] The switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform is determined according to the mapping relationship between the occurrence time of the transient oscillation arc waveform and the occurrence time of the steady-state breakdown arc waveform, the breakdown voltage of the local insulation defect area, the breakdown voltage of the remaining insulation layer, the angular frequency of the power system operation and the input voltage.

[0021] Optionally, the expression for the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform is:

[0022]

[0023] Where, t b Indicates the time when the steady-state breakdown arc waveform appears; t g Indicates the moment when the transient oscillation arc waveform appears; U g Indicates the breakdown voltage of the local insulation defect area; U b represents the breakdown voltage of the remaining insulation layer; ω represents the angular frequency of the power system operation; U i Indicates the input voltage.

[0024] Optionally, the semi-steady-state arc waveform is expressed as:

[0025]

[0026] In the formula, G s (t) represents the transient oscillation arc waveform in the cable; W(i) represents the rectangular window function; G[t0(i)] represents the pulse function; i represents the number of the rectangular window function, and its value range is [1, n]; t represents the time corresponding to the pulse function; t0 represents the delay parameter; u represents the arc voltage; i represents the arc current; g represents the arc conductivity; D represents the arc channel diameter; N d represents the heat dissipation constant of the arc area; l represents the arc length; τ D represents the arc time constant; σ0 represents the volume conductivity constant of the arc.

[0027] According to a second aspect of the present disclosure, a device for modeling a semi-steady arc for local insulation breakdown of a cable is provided, the device comprising:

[0028] A transient oscillation arc waveform acquisition module is used to acquire a transient oscillation arc waveform based on a periodic pulse function in the cable;

[0029] A steady-state breakdown arc waveform acquisition module is used to obtain a steady-state breakdown arc waveform based on an arc gap energy balance equation in the cable;

[0030] A switching time determination module, used for calculating the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the insulation breakdown voltage of the cable;

[0031] A semi-steady-state arc waveform acquisition module is used to combine the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the switching moment to obtain a semi-steady-state arc waveform; the semi-steady-state arc waveform is used to describe the arc conductance at different moments.

[0032] Optionally, the transient oscillation arc waveform is expressed as:

[0033]

[0034] W(i)=θ[t0(i)+3σ]-θ[t0(i)-3σ];

[0035]

[0036] In the formula, G s (t) represents the transient oscillation arc waveform in the cable; W(i) represents the rectangular window function; G[t0(i)] represents the pulse function; i represents the number of the rectangular window function, and its value range is [1, n]; t represents the time corresponding to the pulse function; t0 represents the time delay parameter, which is used to control the oscillation symmetry position; σ represents the standard deviation, which is used to control the width of the oscillation pulse; G0 represents the amplitude of the pulse function.

[0037] Optionally, the steady-state breakdown arc waveform is expressed as:

[0038]

[0039] Where, u represents arc voltage; i represents arc current; g represents arc conductivity; D represents arc channel diameter; N d represents the heat dissipation constant of the arc area; l represents the arc length; τ D represents the arc time constant; σ0 represents the volume conductivity constant of the arc.

[0040] Optionally, the switching time determination module includes:

[0041] A parameter acquisition unit, used to acquire the breakdown voltage of the local insulation defect area, the breakdown voltage of the remaining insulation layer, the angular frequency of the power system operation and the input voltage;

[0042] A switching time acquisition unit is used to determine the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the mapping relationship between the occurrence time of the transient oscillation arc waveform and the occurrence time of the steady-state breakdown arc waveform, the breakdown voltage of the local insulation defect area, the breakdown voltage of the remaining insulation layer, the angular frequency of the power system operation and the input voltage.

[0043] Optionally, the expression for the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform is:

[0044]

[0045] Where, t b Indicates the time when the steady-state breakdown arc waveform appears; t g Indicates the moment when the transient oscillation arc waveform appears; U g Indicates the breakdown voltage of the local insulation defect area; U b represents the breakdown voltage of the remaining insulation layer; ω represents the angular frequency of the power system operation; U i Indicates the input voltage.

[0046] Optionally, the semi-steady-state arc waveform is expressed as:

[0047]

[0048] In the formula, G s (t) represents the transient oscillation arc waveform in the cable; W(i) represents the rectangular window function; G[t0(i)] represents the pulse function; i represents the number of the rectangular window function, and its value range is [1, n]; t represents the time corresponding to the pulse function; t0 represents the delay parameter; u represents the arc voltage; i represents the arc current; g represents the arc conductivity; D represents the arc channel diameter; N drepresents the heat dissipation constant of the arc area; l represents the arc length; τ D represents the arc time constant; σ0 represents the volume conductivity constant of the arc.

[0049] According to a third aspect of the present disclosure, there is provided an electronic device, comprising: a processor and a memory;

[0050] The memory is used to store a computer program executable by the processor;

[0051] The processor is used to execute the computer program in the memory to implement the method as described in any one of the first aspects.

[0052] According to a fourth aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, and when an executable computer program in the storage medium is executed by a processor, the method described in any one of the first aspects can be implemented.

[0053] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0054] The method for modeling the semi-steady-state arc of local insulation breakdown of cables provided by the present disclosure can first obtain a transient oscillating arc waveform based on a periodic pulse function in the cable; then, obtain a steady-state breakdown arc waveform based on an arc gap energy balance equation in the cable; thereafter, calculate the switching moment of the transient oscillating arc waveform and the steady-state breakdown arc waveform according to the insulation breakdown voltage of the cable; finally, combine the transient oscillating arc waveform and the steady-state breakdown arc waveform according to the switching moment to obtain a semi-steady-state arc waveform; the semi-steady-state arc waveform is used to describe the arc conductance at different moments. In this way, the present disclosure can overcome the shortcomings of poor interpretability and difficult parameter setting of existing models by establishing a semi-steady-state arc model that depicts the local insulation breakdown process of cables, thereby providing a theoretical basis for the research on early fault warning and fault identification of cables, which is conducive to reducing the risk of distribution network accidents and reducing line hidden dangers.

[0055] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 The present invention is a flowchart of a method for modeling a semi-steady-state arc of local insulation breakdown of a cable according to an embodiment of the present invention.

[0057] Figure 2 The present invention is a flowchart of obtaining the switching time of a transient oscillation arc waveform and a steady-state breakdown arc waveform according to an embodiment of the present invention.

[0058] Figure 3The present invention is a block diagram of a device for modeling a semi-steady-state arc for partial insulation breakdown of a cable according to an embodiment of the present invention. DETAILED DESCRIPTION

[0059] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0060] In order to solve the above technical problems, the embodiments of the present disclosure provide a method, device and electronic device for modeling a semi-steady arc caused by partial insulation breakdown of a cable. Figure 1 , including steps 11 to 14.

[0061] In step 11, a transient oscillation arc waveform based on a periodic pulse function in the cable is obtained.

[0062] In this step, the transient oscillation arc waveform based on the periodic pulse function in the cable can be obtained, as shown in equations (1) to (3).

[0063]

[0064] W(i)=θ[t0(i)+3σ]-θ[t0(i)-3σ]; (2)

[0065]

[0066] In formula (1) to formula (3), G s (t) represents the transient oscillation arc waveform in the cable; W(i) represents the rectangular window function; G[t0(i)] represents the pulse function; i represents the number of the rectangular window function, and its value range is [1, n]; t represents the time corresponding to the pulse function; t0 represents the time delay parameter, which is used to control the oscillation symmetry position; σ represents the standard deviation, which is used to control the width of the oscillation pulse; G0 represents the amplitude of the pulse function.

[0067] In one example, the width of the oscillation pulse is 6σ, that is, with the delay parameter t0 as the center position, the front and rear widths are each 6σ.

[0068] In this example, the calculated values ​​of the transient oscillation arc waveform are shown in Table 1.

[0069] Table 1 Calculated values ​​of transient oscillation arc waveform

[0070]

[0071]

[0072] In step 12, a steady-state breakdown arc waveform based on an arc gap energy balance equation in the cable is obtained.

[0073] In this step, the steady-state breakdown arc waveform based on the arc gap energy balance equation in the cable can be obtained, as shown in formula (4).

[0074]

[0075] In formula (4), u represents arc voltage; i represents arc current; g represents arc conductance; D represents arc channel diameter; N d represents the heat dissipation constant of the arc area; l represents the arc length; τ D represents the arc time constant; σ0 represents the volume conductivity constant of the arc.

[0076] In this example, the calculated values ​​of the steady-state breakdown arc calculation values ​​are shown in Table 2.

[0077] Table 2 Calculated values ​​of steady-state arc breakdown

[0078]

[0079]

[0080] In step 13, the switching time between the transient oscillation arc waveform and the steady-state breakdown arc waveform is calculated according to the insulation breakdown voltage of the cable.

[0081] In this step, the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform can be calculated according to the insulation breakdown voltage of the cable, see Figure 2 , including step 21 and step 22.

[0082] In step 21, the breakdown voltage U of the local insulation defect region can be obtained. g , the breakdown voltage of the remaining insulation layer U b , the angular frequency ω of the power system operation and the input voltage U i .

[0083] In step 22, according to the mapping relationship between the appearance time of the transient oscillation arc waveform and the appearance time of the steady-state breakdown arc waveform and the breakdown voltage U g , the breakdown voltage of the remaining insulation layer U b , the angular frequency ω of the power system operation and the input voltage U i , determine the switching time between the transient oscillation arc waveform and the steady-state breakdown arc waveform.

[0084] The expression of the switching time between the transient oscillation arc waveform and the steady-state breakdown arc waveform is shown in formula (5).

[0085]

[0086] In formula (5), t b Indicates the time when the steady-state breakdown arc waveform appears; t g Indicates the moment when the transient oscillation arc waveform appears; U g Indicates the breakdown voltage of the local insulation defect area; U b represents the breakdown voltage of the remaining insulation layer; ω represents the angular frequency of the power system operation; U i Indicates the input voltage.

[0087] In step 14, the transient oscillation arc waveform and the steady-state breakdown arc waveform are combined according to the switching moment to obtain a semi-steady-state arc waveform; the semi-steady-state arc waveform is used to describe the arc conductance at different moments.

[0088] In this step, the transient oscillation arc waveform and the steady-state breakdown arc waveform can be combined according to the switching time to obtain a semi-steady-state arc waveform. The expression of the semi-steady-state arc waveform is shown in formula (6).

[0089]

[0090] In formula (6), G s (t) represents the transient oscillation arc waveform in the cable; W(i) represents the rectangular window function; G[t0(i)] represents the pulse function; i represents the number of the rectangular window function, and its value range is [1, n]; t represents the time corresponding to the pulse function; t0 represents the delay parameter; u represents the arc voltage; i represents the arc current; g represents the arc conductivity; D represents the arc channel diameter; N d represents the heat dissipation constant of the arc area; l represents the arc length; τ D represents the arc time constant; σ0 represents the volume conductivity constant of the arc.

[0091] In this example, the semi-steady arc waveform is shown in Table 3.

[0092] Table 3 Calculated values ​​of semi-steady arc waveform

[0093]

[0094] At this point, the present invention can overcome the shortcomings of existing models such as poor interpretability and difficulty in parameter adjustment by establishing a semi-steady-state arc model that characterizes the local insulation breakdown process of the cable, thereby providing a theoretical basis for the research on early fault warning and fault identification of cables, which is conducive to reducing the risk of distribution network accidents and reducing line hidden dangers.

[0095] Based on a cable local insulation breakdown semi-steady arc modeling method provided in an embodiment of the present disclosure, the present disclosure also provides a cable local insulation breakdown semi-steady arc modeling device, see Figure 3 , the device comprises:

[0096] A transient oscillation arc waveform acquisition module 31 is used to acquire a transient oscillation arc waveform based on a periodic pulse function in the cable;

[0097] A steady-state breakdown arc waveform acquisition module 32 is used to acquire a steady-state breakdown arc waveform based on an arc gap energy balance equation in the cable;

[0098] A switching time determination module 33, used to calculate the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the insulation breakdown voltage of the cable;

[0099] The semi-steady-state arc waveform acquisition module 34 is used to combine the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the switching moment to obtain a semi-steady-state arc waveform; the semi-steady-state arc waveform is used to describe the arc conductance at different moments.

[0100] In one embodiment, the transient oscillation arc waveform is expressed as:

[0101]

[0102] W(i)=θ[t0(i)+3σ]-θ[t0(i)-3σ];

[0103]

[0104] In the formula, G s (t) represents the transient oscillation arc waveform in the cable; W(i) represents the rectangular window function; G[t0(i)] represents the pulse function; i represents the number of the rectangular window function, and its value range is [1, n]; t represents the time corresponding to the pulse function; t0 represents the time delay parameter, which is used to control the oscillation symmetry position; σ represents the standard deviation, which is used to control the width of the oscillation pulse; G0 represents the amplitude of the pulse function.

[0105] In one embodiment, the steady-state breakdown arc waveform is expressed as:

[0106]

[0107] Where, u represents arc voltage; i represents arc current; g represents arc conductivity; D represents arc channel diameter; N d represents the heat dissipation constant of the arc area; l represents the arc length; τ Drepresents the arc time constant; σ0 represents the volume conductivity constant of the arc.

[0108] In one embodiment, the switching time determination module includes:

[0109] A parameter acquisition unit, used to acquire the breakdown voltage of the local insulation defect area, the breakdown voltage of the remaining insulation layer, the angular frequency of the power system operation and the input voltage;

[0110] A switching time acquisition unit is used to determine the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the mapping relationship between the occurrence time of the transient oscillation arc waveform and the occurrence time of the steady-state breakdown arc waveform, the breakdown voltage of the local insulation defect area, the breakdown voltage of the remaining insulation layer, the angular frequency of the power system operation and the input voltage.

[0111] In one embodiment, the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform is expressed as:

[0112]

[0113] In the formula, t b Indicates the time when the steady-state breakdown arc waveform appears; t g Indicates the moment when the transient oscillation arc waveform appears; U g Indicates the breakdown voltage of the local insulation defect area; U b represents the breakdown voltage of the remaining insulation layer; ω represents the angular frequency of the power system operation; U i Indicates the input voltage.

[0114] In one embodiment, the semi-steady arc waveform is expressed as:

[0115]

[0116] In the formula, G s (t) represents the transient oscillation arc waveform in the cable; W(i) represents the rectangular window function; G[t0(i)] represents the pulse function; i represents the number of the rectangular window function, and its value range is [1, n]; t represents the time corresponding to the pulse function; t0 represents the delay parameter; u represents the arc voltage; i represents the arc current; g represents the arc conductivity; D represents the arc channel diameter; N d represents the heat dissipation constant of the arc area; l represents the arc length; τ D represents the arc time constant; σ0 represents the volume conductivity constant of the arc.

[0117] It should be noted that the scheme of the device embodiment of the example of the present disclosure has been described in the system embodiment of the cable local insulation breakdown semi-steady-state arc modeling system. Please refer to the contents of the above embodiments for details and will not be repeated here.

[0118] In some possible embodiments, an electronic device is provided, including a processor and a memory;

[0119] The memory is used to store a computer program executable by the processor;

[0120] The processor is used to execute the computer program in the memory to implement the above method.

[0121] In some possible embodiments, a non-transitory computer-readable storage medium is provided. When an executable computer program in the storage medium is executed by a processor, the above-mentioned method for semi-steady-state arc modeling of partial insulation breakdown of a cable can be implemented.

[0122] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0123] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for modeling a semi-steady arc for local insulation breakdown of a cable, characterized in that: The method comprises: Obtaining transient oscillation arc waveform based on periodic pulse function in the cable; Obtain the steady-state breakdown arc waveform based on the arc gap energy balance equation in the cable; Calculating the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the insulation breakdown voltage of the cable; The transient oscillation arc waveform and the steady-state breakdown arc waveform are combined according to the switching moment to obtain a semi-steady-state arc waveform; the semi-steady-state arc waveform is used to describe the arc conductance at different moments.

2. The method according to claim 1, characterized in that The expression of the transient oscillation arc waveform is: W(i)=θ[t0(i)+3σ]-θ[t0(i)-3σ]; In the formula, G s (t) represents the transient oscillation arc waveform in the cable; W(i) represents the rectangular window function; G[t0(i)] represents the pulse function; i represents the number of the rectangular window function, and its value range is [1, n]; t represents the time corresponding to the pulse function; t0 represents the time delay parameter, which is used to control the oscillation symmetry position; σ represents the standard deviation, which is used to control the width of the oscillation pulse; G0 represents the amplitude of the pulse function.

3. The method according to claim 1, characterized in that The expression of the steady-state breakdown arc waveform is: Where, u represents arc voltage; i represents arc current; g represents arc conductivity; D represents arc channel diameter; N d represents the heat dissipation constant of the arc area; l represents the arc length; τ D represents the arc time constant; σ0 represents the volume conductivity constant of the arc.

4. The method according to claim 1, characterized in that: Calculating the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the insulation breakdown voltage of the cable includes: Obtain the breakdown voltage of the local insulation defect area, the breakdown voltage of the remaining insulation layer, the angular frequency and input voltage of the power system operation; The switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform is determined according to the mapping relationship between the occurrence time of the transient oscillation arc waveform and the occurrence time of the steady-state breakdown arc waveform, the breakdown voltage of the local insulation defect area, the breakdown voltage of the remaining insulation layer, the angular frequency of the power system operation and the input voltage.

5. The method according to claim 4, characterized in that The expression of the switching time between the transient oscillation arc waveform and the steady-state breakdown arc waveform is: Where, t b Indicates the time when the steady-state breakdown arc waveform appears; t g Indicates the moment when the transient oscillation arc waveform appears; U g Indicates the breakdown voltage of the local insulation defect area; U b represents the breakdown voltage of the remaining insulation layer; ω represents the angular frequency of the power system operation; U i Indicates the input voltage.

6. The method according to claim 1, characterized in that The expression of the semi-steady arc waveform is: In the formula, G s (t) represents the transient oscillation arc waveform in the cable; W(i) represents the rectangular window function; G[t0(i)] represents the pulse function; i represents the number of the rectangular window function, and its value range is [1, n]; t represents the time corresponding to the pulse function; t0 represents the delay parameter; u represents the arc voltage; i represents the arc current; g represents the arc conductivity; D represents the arc channel diameter; N d represents the heat dissipation constant of the arc area; l represents the arc length; τ D represents the arc time constant; σ0 represents the volume conductivity constant of the arc.

7. A device for modeling a semi-steady arc for local insulation breakdown of a cable, characterized in that: The device comprises: A transient oscillation arc waveform acquisition module is used to acquire a transient oscillation arc waveform based on a periodic pulse function in the cable; A steady-state breakdown arc waveform acquisition module is used to obtain a steady-state breakdown arc waveform based on an arc gap energy balance equation in the cable; A switching time determination module, used for calculating the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the insulation breakdown voltage of the cable; A semi-steady-state arc waveform acquisition module is used to combine the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the switching moment to obtain a semi-steady-state arc waveform; the semi-steady-state arc waveform is used to describe the arc conductance at different moments.

8. The device according to claim 7, characterized in that The switching time determination module includes: A parameter acquisition unit, used to acquire the breakdown voltage of the local insulation defect area, the breakdown voltage of the remaining insulation layer, the angular frequency of the power system operation and the input voltage; A switching time acquisition unit is used to determine the switching time of the transient oscillation arc waveform and the steady-state breakdown arc waveform according to the mapping relationship between the occurrence time of the transient oscillation arc waveform and the occurrence time of the steady-state breakdown arc waveform, the breakdown voltage of the local insulation defect area, the breakdown voltage of the remaining insulation layer, the angular frequency of the power system operation and the input voltage.

9. An electronic device, characterized in that: including a processor and a memory; The memory is used to store a computer program executable by the processor; The processor is used to execute the computer program in the memory to implement the method according to any one of claims 1 to 6.

10. A non-transitory computer-readable storage medium, characterized in that: When the executable computer program in the storage medium is executed by a processor, the method according to any one of claims 1 to 6 can be implemented.

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