High-voltage cable buffer layer ablation simulation gas taking and gas analysis device and method

Abstract

The invention discloses a high-voltage cable buffer layer ablation simulation gas taking and gas analysis device and method, and belongs to the field of cable buffer layer ablation, and the gas taking device comprises an ablation simulation module, a power supply excitation module and a gas taking module; the ablation simulation module comprises a detachable corrugated aluminum sheath and a sealing sleeve; the power supply excitation module comprises a stable power supply; the gas taking module comprises a plurality of gas guide pipes; a plurality of uniformly spaced air taking holes are formed in the side surface of the detachable corrugated aluminum sheath; the detachable corrugated aluminum sheath is used for installing a sample sheath-free cable section; the sealing sleeve is used for sealing two ends of the detachable corrugated aluminum sheath; one pole of the stabilized power supply is connected with the detachable corrugated aluminum sheath through a wire, and the other pole of the stabilized power supply is connected with the outer shielding layer of the sample sheath-free cable section through a wire; and each gas guide pipe takes out the ablation gas at the corresponding gas taking hole. The problems that in the prior art, the ablative gas bidirectional diffusion process cannot be reproduced, and multiple ablative defects cannot be set at the same time are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cable buffer layer ablation, in particular to a high-voltage cable buffer layer ablation simulation gas extraction and gas analysis device and method. BACKGROUND

[0002] Buffer layer ablation defects are an important cause of high-voltage cable body breakdown failures. Research shows that buffer layer ablation generates gas products, mainly due to local stress concentration and local dampening of the buffer layer, which causes current thermal effects and electrochemical corrosion reactions, and is an important detection basis for early buffer layer ablation defects.

[0003] Current ablation simulation is mainly carried out on actual high-voltage cable sections, but the high-voltage cable section has a closed structure, which cannot directly access the buffer layer in the middle part of the cable section and must be achieved by damaging the outer sheath structure of the cable. Due to the above limitations, the buffer layer ablation simulation defects in the past can only be set at the end of the high-voltage cable section, because only the end section can expose the buffer layer structure. Since the ablation gas generated at the end can only diffuse unidirectionally from the defect end to the non-defect end, the current ablation simulation can only simulate the unidirectional diffusion process of the ablation gas, and cannot reproduce the bidirectional diffusion process of the ablation gas in the actual cable. At the same time, since the current ablation simulation can only simulate ablation defects at the end, it cannot simultaneously set multiple ablation defects on the same cable, and thus cannot support the study of the influence of multiple ablation defects on gas diffusion. In summary, the current ablation simulation cannot reproduce the bidirectional diffusion process of the ablation gas in the actual cable, and cannot simultaneously set multiple ablation defects. SUMMARY

[0004] The present application provides a high-voltage cable buffer layer ablation simulation gas extraction and gas analysis device and method, which can solve the problem of the current ablation simulation that cannot reproduce the bidirectional diffusion process of the ablation gas in the actual cable and cannot simultaneously set multiple ablation defects.

[0005] An embodiment of the present application provides a high-voltage cable buffer layer ablation simulation gas extraction device, comprising: an ablation simulation module, a power excitation module, and a gas extraction module; the ablation simulation module comprises: a detachable corrugated aluminum sheath and a sealing sleeve; the power excitation module comprises: a stable power supply; the gas extraction module comprises: a plurality of gas guide pipes;

[0006] The detachable corrugated aluminum sheath is in a cylindrical tubular structure; a rotating shaft is arranged at one bus position of the detachable corrugated aluminum sheath, and a sealable opening is arranged at the other bus position; a plurality of evenly spaced gas extraction holes are arranged on the side surface of the detachable corrugated aluminum sheath; the detachable corrugated aluminum sheath is used for installing a sample cable section without a sheath;

[0007] The sealing sleeve is used for sealing two ends of the detachable corrugated aluminum sheath;

[0008] One pole of the stable power supply is connected to the detachable corrugated aluminum sheath through a wire, and the other pole is connected to the outer shielding layer of the sample sheath-free cable segment through a wire;

[0009] Each of the gas guide pipes is sealingly connected to a gas extraction hole to extract the ablation gas at the position of the corresponding gas extraction hole.

[0010] Further, the first bus position of the detachable corrugated aluminum sheath is provided with a first rotating shaft, the second bus position is provided with a second rotating shaft, and the third bus position is provided with a sealable and closable opening; wherein the first bus and the second bus are symmetrical about the axis of the detachable corrugated aluminum sheath; the distance from the third bus to the first bus is equal to the distance from the third bus to the second bus.

[0011] Further, the ablation simulation module further comprises a connecting switch;

[0012] The connecting switch is arranged at the edge of the corrugated aluminum sheath on both sides of the opening, and is used for connecting and fixing the corrugated aluminum sheaths on both sides of the opening when the opening is in a sealed and closed state.

[0013] Another embodiment of the present application also provides a high-voltage cable buffer layer ablation gas analysis device, comprising: a gas component detection module and a gas distribution analysis module; the gas component detection module is connected to the end of the gas guide pipe of the high-voltage cable buffer layer ablation simulation gas extraction device away from the gas extraction hole, so as to obtain the ablation gas at the position of the corresponding gas extraction hole at a plurality of sampling times through each gas guide pipe;

[0014] The gas component detection module is used for analyzing the components and concentrations of the ablation gas at each gas extraction hole position at each sampling time, and generating ablation gas analysis time sequence data at each gas extraction hole position;

[0015] The gas distribution analysis module is used for obtaining the gas extraction hole position of each gas extraction hole and the ablation gas analysis time sequence data at each gas extraction hole position; generating an ablation gas distribution curve at each time according to the gas extraction hole position and the ablation gas analysis time sequence data; and generating an ablation gas distribution characteristic evolution cloud map according to the ablation gas distribution curves at all sampling times.

[0016] Another embodiment of the present application also provides a high-voltage cable buffer layer ablation simulation gas extraction method, comprising:

[0017] Obtaining ablation defect positions and ablation defect types of a plurality of ablation defects to be simulated;

[0018] For each to-be-simulated ablation defect, according to the ablation defect position and the ablation defect type of the to-be-simulated ablation defect, a corresponding type of ablation defect is arranged at a corresponding position of the sample unjacketed cable segment;

[0019] The sample unjacketed cable segment is installed in the detachable corrugated aluminum jacket of the high-voltage cable buffer layer ablation simulation gas extraction device as claimed in any one of claims 1 to 3;

[0020] The outer shielding layer of the sample unjacketed cable segment is connected to one pole of the stable power supply away from the detachable corrugated aluminum jacket in the high-voltage cable buffer layer ablation simulation gas extraction device through an electric wire;

[0021] The stable power supply is started;

[0022] The ablation gas at each gas extraction hole position is extracted through the gas guide pipe.

[0023] Further, the ablation defect type includes a local moisture defect and a local stress concentration defect;

[0024] The setting method of the local moisture defect includes:

[0025] According to the ablation defect position corresponding to the local moisture defect, the surface of the buffer layer at the corresponding position of the sample unjacketed cable segment is watered;

[0026] The setting method of the local stress concentration defect includes:

[0027] According to the ablation defect position corresponding to the local stress concentration defect, the buffer layer at the corresponding position of the sample unjacketed cable segment is covered with a flexible insulating material.

[0028] Further, the length of the flexible insulating material is not more than half of the outer circumference of the sample unjacketed cable segment, and the width of the flexible insulating material is not more than the spacing between adjacent wave crests of the detachable corrugated aluminum jacket.

[0029] Further, before the setting of the corresponding type of ablation defect at the corresponding position of the sample unjacketed cable segment according to the ablation defect position and the ablation defect type of the to-be-simulated ablation defect for each to-be-simulated ablation defect, the method further includes:

[0030] The sample unjacketed cable segment is dried.

[0031] Further, the sample unjacketed cable segment is sequentially composed of a conductor, an inner shielding layer, an insulating layer, an outer shielding layer, and a buffer layer from inside to outside;

[0032] exposing one end of the sample cable segment outside the detachable corrugated aluminum sheath when installing the sample cable segment in the detachable corrugated aluminum sheath;

[0033] connecting one pole of the stable power source away from the detachable corrugated aluminum sheath to the outer shielding layer of the sample cable segment through the electric wire in the high-voltage cable buffer layer ablation gas sampling device,

[0034] stripping the buffer layer of the sample cable segment exposed outside the detachable corrugated aluminum sheath to expose the outer shielding layer,

[0035] connecting one pole of the stable power source away from the detachable corrugated aluminum sheath to the exposed outer shielding layer through the electric wire.

[0036] Another embodiment of the present application also provides a high-voltage cable buffer layer ablation gas analysis method suitable for the high-voltage cable buffer layer ablation gas analysis device described in the above embodiments, comprising:

[0037] obtaining a plurality of gas sampling hole positions and ablation gases at a plurality of sampling time instants at each gas sampling hole position;

[0038] analyzing the composition and concentration of the ablation gas at each gas sampling hole position at each sampling time instant to generate ablation gas analysis time series data at each gas sampling hole position;

[0039] generating an ablation gas distribution curve at each time instant according to the gas sampling hole position and the ablation gas analysis time series data;

[0040] generating an ablation gas distribution characteristic evolution cloud map according to the ablation gas distribution curves at all sampling time instants.

[0041] By implementing the present application, the following beneficial effects are achieved:

[0042] The high-voltage cable buffer layer ablation simulation gas taking device of the application comprises an ablation simulation module, a power excitation module and a gas taking module; the ablation simulation module comprises a detachable corrugated aluminum sheath and a sealing sleeve; the power excitation module comprises a stable power supply; the gas taking module comprises a plurality of gas guide pipes; the detachable corrugated aluminum sheath is in a cylindrical tubular structure; a rotating shaft is arranged at a certain generatrix position of the detachable corrugated aluminum sheath, and a sealable opening is arranged at another generatrix position; a plurality of uniformly spaced gas taking holes are arranged on the side surface of the detachable corrugated aluminum sheath; the detachable corrugated aluminum sheath is used for mounting a sample cable segment without sheath; the sealing sleeve is used for sealing the two ends of the detachable corrugated aluminum sheath; one pole of the stable power supply is connected to the detachable corrugated aluminum sheath through a wire, and the other pole is connected to the outer shielding layer of the sample cable segment without sheath through a wire; each gas guide pipe is in sealed butt joint with a gas taking hole to take out the ablation gas at the position of the corresponding gas taking hole. The high-voltage cable buffer layer ablation simulation gas taking device of the application is used for mounting a sample cable segment without sheath, and can directly contact the buffer layer of the cable segment. In this way, the problem that the existing high-voltage cable segment used in the ablation simulation is in a closed structure and cannot directly contact the buffer layer of the middle part of the cable segment can be solved, the ablation defect simulation and the ablation gas acquisition can be realized without damaging the outer sheath, a plurality of ablation defects can be arranged at any place of the outer buffer layer of the sample cable segment without sheath instead of being arranged at both ends, and the ablation gas generated can realize a bidirectional diffusion process. In summary, the gas taking device of the application reproduces the bidirectional diffusion process of the ablation gas in the cable and can simultaneously arrange a plurality of ablation defects, thereby solving the problems in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0044] Figure 1 is a cross-sectional structure schematic diagram of a detachable corrugated aluminum sheath mounted with a sample cable segment without sheath provided by an embodiment of the application;

[0045] Figure 2 is a side surface structure schematic diagram of a detachable corrugated aluminum sheath provided by an embodiment of the application;

[0046] Figure 3 is a flowchart schematic diagram of a high-voltage cable buffer layer ablation simulation gas taking method provided by an embodiment of the application;

[0047] Figure 4is a schematic diagram of a connection mode of a stable power supply provided by an embodiment of the present application;

[0048] Figure 5 is a flowchart of a high-voltage cable buffer layer ablation gas analysis method provided by an embodiment of the present application. DETAILED DESCRIPTION

[0049] For the purpose of making the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing the specific embodiments only and not intended to limit the application; the terms "comprise", "comprising", "include", "including" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0051] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "several" is two or more, unless otherwise explicitly specified and limited.

[0052] In this document, the term "embodiment" means that the specific features, structures or properties described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it independent or alternative to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0053] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0054] To solve the problem that the ablation simulation in the prior art cannot reproduce the bidirectional diffusion process of the ablation gas in the actual cable and cannot simultaneously set multiple ablation defects, an embodiment of the present application provides a high-voltage cable buffer layer ablation simulation gas taking device, which comprises an ablation simulation module, a power excitation module and a gas taking module; the ablation simulation module comprises a detachable corrugated aluminum sheath and a sealing sleeve; the power excitation module comprises a stable power supply; and the gas taking module comprises a plurality of gas guide pipes.

[0055] The detachable corrugated aluminum sheath is in a cylindrical tubular structure; a rotating shaft is arranged at a certain generatrix position of the detachable corrugated aluminum sheath, and a sealable opening is arranged at another generatrix position; a plurality of uniformly spaced gas taking holes are arranged on the side surface of the detachable corrugated aluminum sheath; and the detachable corrugated aluminum sheath is used for mounting a sample sheathless cable segment.

[0056] The sealing sleeve is used for sealing the two ends of the detachable corrugated aluminum sheath.

[0057] One pole of the stable power supply is connected to the detachable corrugated aluminum sheath through a wire, and the other pole is connected to the outer shielding layer of the sample sheathless cable segment through a wire.

[0058] Each gas guide pipe is in sealed butt joint with a gas taking hole to take out the ablation gas at the position of the corresponding gas taking hole.

[0059] It should be noted that the sample sheathless cable segment is a 110kV or 220kV high-voltage cable segment.

[0060] Please refer to Figure 1 The cross-sectional structure of the detachable corrugated aluminum sheath with the sample sheathless cable segment mounted thereon is shown in FIG. 2. The detachable corrugated aluminum sheath has two states, i.e., a closed state and an open state. When the detachable corrugated aluminum sheath is in the open state, the aluminum sheath on both sides of the opening is opened around the rotating shaft, and at this time, the sample sheathless cable segment can be mounted in the detachable corrugated aluminum sheath. When the detachable corrugated aluminum sheath is in the closed state, the opening is closed and is in a sealed closed state. The sample sheathless cable segment refers to a cable segment without an outer sheath, and the outermost layer of the cable segment is a buffer layer.

[0061] Please refer to Figure 2 The side surface structure of the detachable corrugated aluminum sheath is shown in FIG. 3. In order to facilitate the installation of the gas guide pipe, the position of the gas taking hole can be arranged at the opening. The sealing sleeve is used to prevent the ablation gas from leaking. The sealing sleeve has two forms, i.e., a solid circle and a circular ring. If the sample sheathless cable segment at one end exceeds the detachable corrugated aluminum sheath, the circular ring sealing sleeve is used, otherwise the solid circle sealing sleeve is used.

[0062] In a preferred embodiment, the gas taking module further comprises a plurality of gas taking valves.

[0063] Each of the gas guide pipes is provided with a gas extraction valve;

[0064] The gas extraction valve is used for controlling the extraction and interruption of the gas.

[0065] In a preferred embodiment, the power supply excitation module further comprises a protection resistor.

[0066] The protection resistor is connected to the circuit in which the stable power supply is located.

[0067] It should be further noted that the high-voltage cable buffer layer ablation simulation gas extraction device of the present application is used for installing a sample cable segment without a sheath, and can directly contact the buffer layer of the cable segment. In this way, the problem that the existing high-voltage cable segment used in the ablation simulation is in a closed structure and cannot directly contact the buffer layer of the middle part of the cable segment can be solved, and the ablation defect simulation and the ablation gas extraction can be realized without damaging the outer sheath. A plurality of ablation defects can be set at any place of the outer buffer layer of the sample cable segment without a sheath, instead of being able to only set the ablation defects at both ends, so that the ablation gas generated can realize a bidirectional diffusion process. In summary, the gas extraction device of the present application reproduces the bidirectional diffusion process of the ablation gas in the cable and can simultaneously set a plurality of ablation defects, thereby solving the problems in the prior art.

[0068] In a preferred embodiment, the first bus position of the detachable corrugated aluminum sheath is provided with a first rotating shaft, the second bus position is provided with a second rotating shaft, and the third bus position is provided with a sealable and closable opening; wherein the first bus and the second bus are symmetrical about the axis of the detachable corrugated aluminum sheath; and the distance from the third bus to the first bus is equal to the distance from the third bus to the second bus.

[0069] In a preferred embodiment, the ablation simulation module further comprises a connection switch.

[0070] The connection switch is arranged at the edge of the corrugated aluminum sheath on both sides of the opening, and is used for connecting and fixing the corrugated aluminum sheaths on both sides of the opening when the opening is in a sealable and closed state.

[0071] Another embodiment of the present application provides a high-voltage cable buffer layer ablation gas analysis device, which comprises a gas component detection module and a gas distribution analysis module; the gas component detection module is connected to the end of the gas guide pipe of the high-voltage cable buffer layer ablation simulation gas extraction device away from the gas extraction hole, so as to extract the ablation gas at a plurality of sampling moments at the position of the corresponding gas extraction hole through each of the gas guide pipes.

[0072] The gas component detection module is configured to analyze the components and concentrations of the ablation gas at each sampling time and at each gas sampling hole position, and generate ablation gas analysis time-series data at each gas sampling hole position.

[0073] The gas distribution analysis module is configured to obtain the gas sampling hole positions of each gas sampling hole and the ablation gas analysis time-series data at each gas sampling hole position, generate an ablation gas distribution curve at each time according to the gas sampling hole positions and the ablation gas analysis time-series data, and generate an ablation gas distribution characteristic evolution cloud map according to the ablation gas distribution curves at all sampling times.

[0074] It should be noted that the gas component detection module includes gas testing instruments such as a gas chromatograph and an infrared spectrometer. The gas distribution analysis module includes an upper computer and analysis software.

[0075] As shown in FIG. 1, Figure 3 Based on the above-mentioned high-voltage cable buffer layer ablation simulation gas sampling device embodiment, an embodiment of the present application provides a high-voltage cable buffer layer ablation simulation gas sampling method, which comprises the following steps:

[0076] S1, obtaining ablation defect positions and ablation defect types of a plurality of ablation defects to be simulated.

[0077] In step S1, the ablation defect positions and the ablation defect types of a plurality of ablation defects to be simulated set by a user are obtained. The ablation defect position refers to the position of the ablation defect in the sample cable segment without a sheath.

[0078] S2, for each ablation defect to be simulated, a corresponding type of ablation defect is set at a corresponding position of the sample cable segment without a sheath according to the ablation defect position and the ablation defect type of the ablation defect to be simulated.

[0079] In a preferred embodiment, before setting, for each ablation defect to be simulated, a corresponding type of ablation defect at a corresponding position of the sample cable segment without a sheath according to the ablation defect position and the ablation defect type of the ablation defect to be simulated, the method further comprises the following steps:

[0080] The sample cable segment without a sheath is dried.

[0081] It should be noted that the sample cable segment without a sheath is dried in a drying chamber, the drying temperature ranges from 60 to 100 DEG C, and the drying time ranges from 6 to 24 hours.

[0082] In a preferred embodiment, the ablation defect types include a local moisture defect and a local stress concentration defect.

[0083] The setting method of the local moisture defect comprises the following steps:

[0084] According to the ablation defect position corresponding to the local moisture defect, water is injected at the buffer layer surface at the position corresponding to the sample cable segment without sheath;

[0085] The method for setting the local stress concentration defect comprises:

[0086] According to the ablation defect position corresponding to the local moisture defect, the buffer layer at the position corresponding to the sample cable segment without sheath is covered with flexible insulation material.

[0087] It should be noted that when water is injected at the sample cable segment without sheath, the amount of water injected at each position is between 1 mL and 100 mL.

[0088] In a preferred embodiment, the length of the flexible insulation material is not more than half the outer circumference of the sample cable segment without sheath; and the width of the flexible insulation material is not more than the distance between adjacent wave crests of the detachable corrugated aluminum sheath.

[0089] It should be noted that the width of the flexible insulation material is usually between 2 mm and 8 mm. The flexible insulation material is polyethylene, polypropylene or silicone rubber.

[0090] S3, installing the sample cable segment without sheath in the detachable corrugated aluminum sheath of the high-voltage cable buffer layer ablation simulation gas extraction device according to any one of claims 1 to 3.

[0091] In step S3, the process of installing the sample cable segment without sheath is as follows: opening the detachable corrugated aluminum sheath along the opening and around the rotating shaft; placing the sample cable segment without sheath into the detachable corrugated aluminum sheath; closing the detachable corrugated aluminum sheath around the rotating shaft and sealing the opening; and sealing the two ends of the detachable corrugated aluminum sheath using a sealing sleeve.

[0092] S4, connecting one pole of a stable power supply away from the detachable corrugated aluminum sheath in the high-voltage cable buffer layer ablation simulation gas extraction device to the outer shielding layer of the sample cable segment without sheath through an electric wire.

[0093] In a preferred embodiment, the sample cable segment without sheath comprises, from the inside to the outside, a conductor, an inner shielding layer, an insulation layer, an outer shielding layer and a buffer layer.

[0094] When the sample cable segment without sheath is installed in the detachable corrugated aluminum sheath, one end of the sample cable segment without sheath is exposed outside the detachable corrugated aluminum sheath.

[0095] The connecting one pole of a stable power supply away from the detachable corrugated aluminum sheath in the high-voltage cable buffer layer ablation simulation gas extraction device to the outer shielding layer of the sample cable segment without sheath through an electric wire comprises:

[0096] Exposing the sample unsheathed cable segment to the buffer layer peeling outside the detachable corrugated aluminum sheath to expose the outer shielding layer;

[0097] Connecting one pole of the stable power supply away from the detachable corrugated aluminum sheath to the exposed outer shielding layer through the wire.

[0098] Please refer to Figure 4 for the schematic diagram of the connection mode of the stable power supply.

[0099] S5, starting the stable power supply.

[0100] In a preferred embodiment, the starting the stable power supply comprises:

[0101] Starting the stable power supply to apply a constant power frequency voltage or a constant power frequency current to the sample unsheathed cable segment; wherein the duration of applying the constant power frequency voltage or the constant power frequency current ranges from 30s to 90min.

[0102] If the constant power frequency voltage is applied, the amplitude of the constant power frequency voltage ranges from 1V to 15V.

[0103] If the constant power frequency current is applied, the amplitude of the constant power frequency current ranges from 10mA to 1A.

[0104] S6, taking out the ablation gas at each gas sampling hole position through the gas guide pipe.

[0105] As Figure 5 shown, based on the above-mentioned high-voltage cable buffer layer ablation gas analysis device embodiment, an embodiment of the present application provides a high-voltage cable buffer layer ablation gas analysis method suitable for the high-voltage cable buffer layer ablation gas analysis device, comprising:

[0106] S7, obtaining a plurality of gas sampling hole positions and ablation gas at each gas sampling hole position at a plurality of sampling time points;

[0107] S8, analyzing the composition and concentration of the ablation gas at each gas sampling hole position at each sampling time point to generate ablation gas analysis time series data at each gas sampling hole position;

[0108] S9, generating an ablation gas distribution curve at each time point according to the gas sampling hole position and the ablation gas analysis time series data;

[0109] S10, generating an ablation gas distribution characteristic evolution cloud map according to the ablation gas distribution curves at all sampling time points.

[0110] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements are also considered to be within the scope of the present application.

Claims

1. A high voltage cable buffer layer ablation simulation gas extraction device, characterized by, The application relates to a high-voltage cable buffer layer ablation simulation gas extraction device. The device comprises an ablation simulation module, a power excitation module and a gas extraction module. The ablation simulation module comprises a detachable corrugated aluminum sheath and a sealing sleeve; the power excitation module comprises a stable power supply; and the gas extraction module comprises a plurality of gas guide pipes. The detachable corrugated aluminum sheath is in a cylindrical tubular structure; a rotating shaft is arranged at a certain generatrix position of the detachable corrugated aluminum sheath, and a sealable opening is arranged at another generatrix position; a plurality of uniformly spaced gas extraction holes are arranged on the side surface of the detachable corrugated aluminum sheath; and the detachable corrugated aluminum sheath is used for mounting a sample sheathless cable segment. The sealing sleeve is used for sealing the two ends of the detachable corrugated aluminum sheath. One pole of the stable power supply is connected to the detachable corrugated aluminum sheath through a wire, and the other pole is connected to the outer shielding layer of the sample sheathless cable segment through a wire. Each gas guide pipe is in sealed butt joint with one gas extraction hole to extract the ablation gas at the position of the corresponding gas extraction hole.

2. The high voltage cable buffer layer ablation simulation gas extraction device of claim 1, wherein, The first generatrix position of the detachable corrugated aluminum sheath is provided with a first rotating shaft, the second generatrix position is provided with a second rotating shaft, and the third generatrix position is provided with a sealable opening; wherein the first generatrix and the second generatrix are symmetrical about the axis of the detachable corrugated aluminum sheath; and the distance from the third generatrix to the first generatrix is equal to the distance from the third generatrix to the second generatrix.

3. The high voltage cable buffer layer ablation simulation gas extraction device of claim 1, wherein, The ablation simulation module further comprises a connecting switch. The connecting switch is arranged at the edge of the corrugated aluminum sheath on the two sides of the opening and is used for connecting and fixing the corrugated aluminum sheaths on the two sides of the opening when the opening is in a sealed closed state.

4. A high voltage cable buffer layer ablation gas analysis device, characterized by The application relates to a high-voltage cable buffer layer ablation simulation gas extraction device. The gas composition detection module is connected with the far end of the gas guide pipe of the high-voltage cable buffer layer ablation simulation gas extraction device of claim 1 to obtain the ablation gas at the position of the corresponding gas extraction hole at a plurality of sampling moments through each gas guide pipe. The gas composition detection module is used for analyzing the composition and concentration of the ablation gas at each gas extraction hole position at each sampling moment to generate ablation gas analysis time sequence data at each gas extraction hole position. The gas distribution analysis module is used for obtaining the gas extraction hole position of each gas extraction hole and the ablation gas analysis time sequence data at each gas extraction hole position; generating an ablation gas distribution curve at each moment according to the gas extraction hole position and the ablation gas analysis time sequence data; and generating an ablation gas distribution characteristic evolution cloud picture according to the ablation gas distribution curves at all sampling moments.

5. A method for ablation simulation gas extraction from a high voltage cable buffer layer, characterized in that, The application relates to a high-voltage cable buffer layer ablation simulation gas extraction device. The application relates to a high-voltage cable buffer layer ablation simulation gas extraction device. The application relates to a high-voltage cable buffer layer ablation simulation gas extraction device. The application relates to a high-voltage cable buffer layer ablation simulation gas extraction device. connecting one pole of a stable power supply away from the detachable corrugated aluminum sheath in the high-voltage cable buffer layer ablation simulation gas extraction device to the outer shielding layer of the sample sheathless cable segment through an electric wire; starting the stable power supply; extracting the ablation gas at each gas extraction hole position through a gas guide tube.

6. The high voltage cable buffer layer ablation simulation gas extraction method of claim 5, wherein, The ablation defect types include local moisture defects and local stress concentration defects. The method for setting the local moisture defects comprises: injecting water on the surface of the buffer layer at the corresponding position of the sample sheathless cable segment according to the ablation defect position corresponding to the local moisture defect; The method for setting the local stress concentration defects comprises: covering the buffer layer with flexible insulation material at the corresponding position of the sample sheathless cable segment according to the ablation defect position corresponding to the local stress concentration defect.

7. The high voltage cable bedding burnback gas extraction method of claim 6, wherein, The length of the flexible insulation material is not more than half of the outer circumference of the sample sheathless cable segment, and the width of the flexible insulation material is not more than the spacing between adjacent wave crests of the detachable corrugated aluminum sheath.

8. The high voltage cable bedding burnback gas extraction method of claim 5, wherein, Before setting the ablation defect of the corresponding type at the corresponding position of the sample sheathless cable segment according to the ablation defect position and the ablation defect type of the to-be-simulated ablation defect for each to-be-simulated ablation defect, the method further comprises: drying the sample sheathless cable segment.

9. The high voltage cable bedding burnback gas extraction method of claim 5 wherein, The sample sheathless cable segment is sequentially composed of a conductor, an inner shielding layer, an insulation layer, an outer shielding layer, and a buffer layer from the inside to the outside; When the sample sheathless cable segment is installed in the detachable corrugated aluminum sheath, one end of the sample sheathless cable segment is exposed outside the detachable corrugated aluminum sheath; The method for connecting one pole of a stable power supply away from the detachable corrugated aluminum sheath in the high-voltage cable buffer layer ablation simulation gas extraction device to the outer shielding layer of the sample sheathless cable segment through an electric wire comprises: stripping the buffer layer of the part of the sample sheathless cable segment exposed outside the detachable corrugated aluminum sheath to expose the outer shielding layer; connecting one pole of the stable power supply away from the detachable corrugated aluminum sheath to the exposed outer shielding layer through an electric wire.

10. A method of analyzing a buffer layer ablation gas of a high voltage cable, which is suitable for the high voltage cable buffer layer ablation gas analyzing apparatus according to claim 3, characterized by, The method comprises: obtaining a plurality of gas extraction hole positions and ablation gas at each gas extraction hole position at a plurality of sampling time points; analyzing the composition and concentration of the ablation gas at each gas extraction hole position at each sampling time point to generate ablation gas analysis time series data at each gas extraction hole position; generating an ablation gas distribution curve at each time point according to the gas extraction hole position and the ablation gas analysis time series data; generating an ablation gas distribution characteristic evolution cloud map according to the ablation gas distribution curves at all sampling time points. The method comprises: obtaining a plurality of gas extraction hole positions and ablation gas at each gas extraction hole position at a plurality of sampling time points; analyzing the composition and concentration of the ablation gas at each gas extraction hole position at each sampling time point to generate ablation gas analysis time series data at each gas extraction hole position; generating an ablation gas distribution curve at each time point according to the gas extraction hole position and the ablation gas analysis time series data; generating an ablation gas distribution characteristic evolution cloud map according to the ablation gas distribution curves at all sampling time points.

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