CN114814479A - Power cable performance measurement method, apparatus, storage medium, and program product - Google Patents
Power cable performance measurement method, apparatus, storage medium, and program product Download PDFInfo
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- CN114814479A CN114814479A CN202210223220.5A CN202210223220A CN114814479A CN 114814479 A CN114814479 A CN 114814479A CN 202210223220 A CN202210223220 A CN 202210223220A CN 114814479 A CN114814479 A CN 114814479A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The application provides a performance measuring method, a performance measuring device, a storage medium and a program product of a power cable. The evaluation index of the electric field intensity is provided for the existing performance detection method, so that the performance of the cable is evaluated more comprehensively, the insulation defect of the cable body can be found more conveniently, and the safety and the stability of a power system are improved.
Description
Technical Field
The present application relates to the field of power cable performance measurement technologies, and in particular, to a method, an apparatus, a storage medium, and a program product for measuring performance of a power cable.
Background
The power cable is used for transmitting and distributing electric energy, the power cable is the first choice for replacing an overhead line (a line based on ultra-high voltage alternating current and direct current transmission system power transmission) due to the advantages of large transmission capacity, low electric energy loss, small electromagnetic environment influence and the like, the insulation performance of the cable is directly related to the safe and stable operation of the cable, and therefore the insulation performance of the cable is of great importance.
Currently, the performance of power cables is measured by routine tests, pattern tests and acceptance tests, wherein the routine tests and the pattern tests are measured before the cables are laid. Routine tests are tests performed by manufacturers on all finished cables, including direct current resistance detection, insulation resistance detection, partial discharge detection of voltage withstanding tests and the like of leads, and aim to check whether the product quality meets the requirements of technical conditions. The type test is to carry out comprehensive performance test on the product periodically by a manufacturer, and comprises the thermal aging performance of the insulation and the sheath, the long-term stability test of the power cable and the like.
With the deep research of the cable, the requirement on the examination of the cable material is higher and higher, and the indexes considered by the detection mode are not comprehensive enough, so that the performance evaluation of the cable is not comprehensive enough.
Disclosure of Invention
The application provides a performance measurement method, a performance measurement device, a storage medium and a program product of a power cable, which are used for solving the problem that the performance evaluation of the cable is not comprehensive due to the fact that indexes considered by the existing cable performance detection mode are not comprehensive enough.
In a first aspect, the present application provides a performance measurement method for a power cable, applied to a measurement device, the method including:
acquiring a measuring signal of at least one electric field sensor arranged on a cable, wherein the at least one electric field sensor is arranged on the surface and/or inside the cable body;
processing the measurement signals to obtain the electric field intensity of each detection position of the electric field sensor;
and judging whether the cable at the detection position of the electric field sensor has insulation defects or not according to the electric field intensity.
Optionally, the insulating layer thickness of cable body is less than preset thickness, and each electric field sensor interval is predetermine the distance and is set up in the surface of cable body, according to electric field strength, judge whether there is insulation defect in the cable of electric field sensor detection position, include:
when the electric field intensity corresponding to the first electric field sensor is not within the standard range of the electric field intensity of the cable body, determining that the cable at the detection position of the first electric field sensor has an insulation defect;
or when the electric field intensity corresponding to the first electric field sensor is within the electric field intensity standard range of the cable body, and when the difference value of the electric field intensity of the first electric field sensor and the electric field intensity of the second electric field sensor is greater than a first preset value, determining that the insulation defect exists in the cable part between the first electric field sensor and the second electric field sensor.
Optionally, the thickness of the insulating layer of the cable body is greater than or equal to a preset thickness, and the cable body includes three structural layers: sinle silk, insulating layer and shielding layer, all be provided with electric field sensor on the primary importance of two at least structural layers of cable, on the same structural layer with be provided with electric field sensor on the second place of primary importance interval default distance, each electric field sensor all with measuring equipment connects, according to electric field strength, judge whether there is insulating defect in the cable that electric field sensor surveyed the position, include:
when the electric field intensity corresponding to the electric field sensor positioned at the first position in each structural layer is within the electric field intensity standard range corresponding to each structural layer, and the difference value of the electric field intensity corresponding to the electric field sensor positioned at the first position in any two structural layers is greater than a preset difference value, determining that the cable has an insulation defect at the first position;
or when the electric field intensity corresponding to the electric field sensor located at the first position in each structural layer is within the electric field intensity standard range corresponding to each structural layer, the difference value of the electric field intensities corresponding to the electric field sensors located at the first position in any two structural layers is smaller than or equal to the preset difference value, and the difference value of the electric field intensity corresponding to the electric field sensor located at the first position in the same structural layer and the electric field intensity corresponding to the electric field sensor located at the second position is larger than a second preset value, determining that the insulation defect exists in the part, between the first position and the second position, of the cable in the same structural layer.
Optionally, the test power supply connected to the cable body generates a voltage under an operating condition of one or more of the following cables: the acquiring of the measurement signal of each electric field sensor includes:
and acquiring a measuring signal of each electric field sensor under different operating conditions of the cable.
Optionally, a signal amplifier is connected between the measuring device and the electric field sensor, and the acquiring of the measurement signal of each electric field sensor includes:
and acquiring the measurement signal amplified by the signal amplifier.
Optionally, before processing the measurement signal to obtain the electric field strength of each detection position of the electric field sensor, the method further includes:
and amplifying the measuring signal of each electric field sensor.
In a second aspect, the present application provides a measurement device comprising:
the acquisition module is used for acquiring a measurement signal of at least one electric field sensor arranged on the cable, and the at least one electric field sensor is arranged on the surface and/or inside the cable body;
the processing module is used for processing the measurement signals to obtain the electric field intensity of each detection position of the electric field sensor;
and the judging module is used for judging whether the cable at the detection position of the electric field sensor has insulation defects or not according to the electric field intensity.
In a third aspect, the present application provides a measurement device comprising: a processor, and a memory communicatively coupled to the processor;
the memory stores computer-executable instructions;
the processor executes computer-executable instructions stored by the memory to implement the method of the first aspect.
In a fourth aspect, the present application provides a computer-readable storage medium having stored therein computer-executable instructions for implementing a method of measuring performance of a power cable according to the first aspect when the computer-executable instructions are executed by a processor.
In a fifth aspect, the present application provides a computer program product comprising a computer program which, when executed by a processor, implements the method of the first aspect.
According to the performance measuring method, device, storage medium and program product of the power cable, the measuring signal of at least one electric field sensor arranged on the cable is obtained, the electric field sensor is arranged on the surface and/or inside of the cable body, then the measuring signal is processed, the electric field strength of the detecting position of the electric field sensor is obtained, whether the cable at the detecting position has an insulation defect or not is judged according to the electric field strength, and therefore the insulation performance of the cable is evaluated. The evaluation index of the electric field intensity is provided for the existing performance detection method, so that the performance evaluation of the cable is more comprehensive, the insulation defect of the cable body can be found more conveniently, and the safety and the stability of a power system are improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic view of an application scenario of a performance testing method for a power cable provided in the present application;
fig. 2 is a partial schematic view of an electric field sensor provided in the cable body 1 according to the present application;
fig. 3 is a partial schematic view of an electric field sensor provided in another cable body 1 provided in the present application;
fig. 4 is a schematic flowchart of a method for measuring performance of a power cable according to an embodiment of the present disclosure;
FIG. 5 is a schematic view of a first position and a second position of a cable provided in accordance with an embodiment of the present application;
fig. 6 is a schematic structural diagram of a measurement apparatus according to a second embodiment of the present application;
fig. 7 is a schematic structural diagram of a measurement device according to a third embodiment of the present invention.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. The drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the concepts of the application by those skilled in the art with reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like 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 application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Currently, the performance of power cables is measured by routine tests, pattern tests and acceptance tests, wherein the routine tests and the pattern tests are measured before the cables are laid. Routine tests are tests performed by manufacturers on all finished cables, including direct current resistance detection, insulation resistance detection, partial discharge detection of voltage withstanding tests and the like of leads, and aim to check whether the product quality meets the requirements of technical conditions. The type test is to carry out comprehensive performance test on the product periodically by a manufacturer, and comprises the tests on the thermal aging performance of the insulation and the sheath, the long-term stability of the power cable and the like, and whether the product can meet the running requirement can be tested through the type test.
In cable research, the fact that when insulation of a cable body is defective, the overall electric field intensity of the cable body with the insulation defect is suddenly increased or locally distorted is found, the insulation defect generally refers to the defect of an insulating material, and comprises material damage, electron or hole injection impurities and the like, the insulation strength of the defect is reduced, the electric field intensity changes at the position, and local breakdown is easily caused. The electric field strength is a physical quantity used to indicate the strength and direction of the electric field, and may be in units of kilovolts per millimeter.
However, with the intensive research of cables, the requirement for the examination of cable materials is higher and higher, and the above detection mode does not consider the comprehensive performance evaluation of the cable because the detection of the electric field strength of the cable body is not considered.
Therefore, the application provides a performance measurement method, a device, a storage medium and a program product of a power cable, the electric field sensor is arranged on the surface and/or inside of the cable body to detect the electric field intensity of the cable body, and then whether the cable at the detection position has an insulation defect or not can be judged according to the electric field intensity, so that the insulation performance of the cable is evaluated, the evaluation index of the electric field intensity is provided for the existing performance detection method, the performance evaluation of the cable is more comprehensive, the insulation defect of the cable body can be found more favorably, and the safety and the stability of a power system are improved.
Fig. 1 is an application scene schematic diagram of a performance test method of a power cable that this application provided, and cable body 1 includes three structural layer in the drawing, and there is a thin shielding layer on cable body 1 surface, and 2 parcel cable body's sinle silk 3 of insulating layer of cable body, and the one end of sinle silk 3 is connected with test power supply 4, and test power supply 4 can produce the voltage under the multiple operating condition: the voltage required by different loads, the voltage required by different polarities, the voltage required by transient state and stable state before and after polarity inversion and the like, so that the performance of the cable body is measured under different operating conditions, and the evaluation is more accurate. The shielding layer corresponding to the other end of the wire core 3 is grounded, and the test power supply 4 is grounded to form a test power supply 4, the cable body 1 and a grounded loop, so that a transient state electric field and a steady state electric field are ensured to be formed, and the test is completed.
Taking an electric field sensor as an example, the position of the electric field sensor 5 in the figure is only an example, the setting position of the electric field sensor 5 may be set on any structural layer inside the cable body or on the surface of the cable body 1, the electric field sensor 5 is connected with its independent functional power supply 6, the output end of the electric field sensor 5 is connected with the signal amplifier 7, when the measurement signal collected by the electric field sensor 5 is weak, the signal amplifier 7 may amplify the signal and then send the signal to the measurement device 8 (the measurement device 8 is grounded) connected with it, so that the measurement device 8 may process the signal according to the measurement signal to determine whether the cable at the detection position of the electric field sensor has an insulation defect.
Alternatively, the number of the electric field sensors 5 may be multiple, fig. 2 and 3 are partial schematic views of 2 electric field sensors disposed in the cable body 1, the positions of the electric field sensors 5 in the drawings are only examples, and as shown in fig. 2, multiple electric field sensors may share the same signal amplifier and measurement device, that is, multiple electric field sensors are connected to the same signal amplifier and measurement device. As shown in fig. 3, the plurality of electric field sensors may also be connected to the respective signal amplifiers and the measuring devices, and in this connection manner, signals acquired by the plurality of measuring devices may be concentrated into one of the measuring devices, so as to determine whether the insulation defect exists in the entire cable body.
It should be noted that the measuring device 8 may be a server, or may be any electronic device having a calculating and processing function, and the present application is not limited thereto.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following embodiments may exist independently or in combination, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Referring to fig. 4, fig. 4 is a schematic flowchart of a method for measuring performance of a power cable according to an embodiment of the present application, where the method may be performed by a measurement device, and the measurement device may be a server, and the method includes the following steps.
S401, obtaining a measuring signal of at least one electric field sensor arranged on the cable, wherein the at least one electric field sensor is arranged on the surface and/or inside the cable body.
When the detection position of each electric field sensor detects the electric field intensity, a corresponding signal is output, and the server can acquire the measurement signal of at least one electric field sensor arranged on the cable.
When the measuring signal is used as the electric field sensor, due to the piezoelectric effect of the electric field sensor, after the electric field intensity is set at the position of the electric field sensor, a small pressure is generated inside the sensor, the pressure can change the current in the circuit of the sensor, the measuring signal can be a change value of the current, and the change value of the current can reflect the magnitude of the electric field intensity. The direction of the electric field intensity is judged by setting relevant parameters of the piezoresistor of the electric field sensor, namely, the piezoresistors are arranged in different directions, and the current change caused by the resistor in a certain direction.
In order to make the performance detection method of the cable more accurate, the test power supply connected with the cable body can generate the following voltage under one or more operation conditions: the performance detection method comprises the following steps of detecting voltages required by different loads, voltages required by different polarities, and voltages required by transient states and steady states before and after polarity inversion, so that the performance detection of the cable under different operation conditions is realized. The voltages required by different loads can be understood as voltages with different magnitudes output by the test power supply, the voltages required by different polarities can be understood as voltages when the voltage output by the test power supply is a negative electrode or voltages when the voltage output by the test power supply is a positive electrode, and the voltages required by transient state and steady state before and after polarity inversion are voltages required by transient state and steady state before and after the output voltage of the test power supply is converted from the positive electrode to the negative electrode or from the negative electrode to the positive electrode.
Then, the server can obtain the measurement signal of each electric field sensor under the different operating conditions of the cable, thereby realizing the performance test under the different operating conditions of the cable.
Optionally, a signal amplifier may be disposed between the measuring device and the electric field sensor, that is, the signal amplifier is connected between the measuring device and the electric field sensor, and then the server acquires the measurement signal amplified by the signal amplifier.
Optionally, before processing the measurement signal to obtain the electric field strength of the detection position of each electric field sensor, the server may also amplify the measurement signal of each electric field sensor.
S402, processing the measurement signals to obtain the electric field intensity of each detection position of the electric field sensor.
The server can process the acquired measurement signal to obtain the electric field intensity of each detection position of the electric field sensor, namely, the measurement signal is input into a signal processing algorithm to obtain the electric field intensity.
And S403, judging whether the cable at the detection position of the electric field sensor has insulation defects or not according to the electric field intensity.
When the thickness of the insulating layer of the cable body is smaller than the preset thickness, for example, the preset thickness is 6cm (centimeter), that is, the thickness of the insulating layer of the cable body is thinner, each electric field sensor can be arranged on the surface of the cable body at a preset distance, optionally, also can be arranged in a certain structural layer in the cable body, because the thickness of the insulating layer is thinner, the signal value measured at the arrangement position of the electric field sensor can approximately represent the signal value corresponding to all structural layers of the cable at the position, that is, for the cable with thinner wire core, the electric field strength of each structural layer corresponding to the position can be obtained through one electric field sensor. Whether the cable has insulation defects or not can be judged by the following modes:
when the electric field intensity corresponding to the first electric field sensor is not within the standard range of the electric field intensity of the cable body, the cable at the detection position of the first electric field sensor can be determined to have insulation defects.
Or when the electric field intensity corresponding to the first electric field sensor is within the electric field intensity standard range of the cable body, and when the difference value of the electric field intensity of the first electric field sensor and the electric field intensity of the second electric field sensor is greater than a first preset value, the cable part between the first electric field sensor and the second electric field sensor is determined to have insulation defects.
Optionally, it may also be determined that the insulation defect exists in the portion of the cable corresponding to the preset distance by determining whether the electric field intensity corresponding to the second electric field sensor is within the electric field intensity standard range of the cable body, and when the electric field intensity corresponding to the second electric field sensor is not within the electric field intensity standard range of the cable body.
When the insulating layer thickness of cable body is greater than or equal to and predetermines thickness, cable body's insulating layer is thick promptly, and cable body includes following three structural layer: the cable comprises a cable core, an insulating layer and a shielding layer, wherein the insulating layer is thick, the electric field intensity of each structural layer of a cable body is different, the electric field intensity from the insulating layer to the shielding layer is increased from small to large according to a near linear relation, the electric field intensity of the same position of any one structural layer cannot be approximately expressed as the electric field intensity of other structural layers of the position, so that electric field sensors are arranged at first positions of at least two structural layers of the cable, the electric field sensors are arranged at second positions, which are spaced from the first positions by preset distances, on the same structural layer, each electric field sensor is connected with measuring equipment, and the first positions and the second positions can refer to fig. 5. By judging the added value between the electric field intensities of any two structural layers, whether the cable has insulation defects or not can be accurately judged. Whether the cable has insulation defects or not can be judged by the following modes:
and when the electric field intensity corresponding to the electric field sensor positioned at the first position in each structural layer is within the electric field intensity standard range corresponding to each structural layer, and the difference value of the electric field intensity corresponding to the electric field sensor positioned at the first position in any two structural layers is greater than a preset difference value, determining that the cable has an insulation defect at the first position.
Or, when the electric field intensity corresponding to the electric field sensor located at the first position in each structural layer is within the electric field intensity standard range corresponding to each structural layer, the difference between the electric field intensities corresponding to the electric field sensors located at the first position in any two structural layers is smaller than or equal to a preset difference, and the difference between the electric field intensity corresponding to the electric field sensor located at the first position in the same structural layer and the electric field intensity corresponding to the electric field sensor located at the second position in the same structural layer is larger than a second preset value, it may be determined that the portion of the cable between the first position and the second position in the same structural layer has an insulation defect, where the second preset value is equal to the first preset value.
Optionally, it may also be determined whether the electric field intensity corresponding to the electric field sensor located at the second position of each structural layer is within the electric field intensity standard range corresponding to each structural layer, and when the electric field intensity corresponding to the electric field sensor located at the second position of each structural layer is not within the electric field intensity standard range corresponding to each structural layer, it may also be determined that the insulation defect exists in the portion of the cable between the first position and the second position in the same structural layer.
In this embodiment, a measurement signal of at least one electric field sensor arranged on the cable is acquired, the electric field sensor is arranged on the surface and/or inside the cable body, then the measurement device processes the measurement signal to obtain an electric field strength of a detection position of the electric field sensor, and whether the cable at the detection position has an insulation defect is judged according to the electric field strength, so that the insulation performance of the cable is evaluated. The evaluation index of the electric field intensity is provided for the existing performance detection method, so that the performance evaluation of the cable is more comprehensive, the insulation defect of the cable body can be found more conveniently, and the safety and the stability of a power system are improved.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a measurement device according to a second embodiment of the present application. As shown in fig. 6, the apparatus 60 includes: an acquisition module 601, a processing module 602 and a judgment module 603.
The acquiring module 601 is configured to acquire a measurement signal of at least one electric field sensor disposed on the cable, where the at least one electric field sensor is disposed on a surface and/or inside of the cable body.
And the processing module 602 is configured to process the measurement signal to obtain an electric field strength of the detection position of each electric field sensor.
And the judging module 603 is configured to judge whether the cable at the detection position of the electric field sensor has an insulation defect according to the electric field strength.
Optionally, the thickness of the insulating layer of the cable body is smaller than a preset thickness, the preset distance between the electric field sensors is set on the surface of the cable body, and the determining module 603 is specifically configured to:
and when the electric field intensity corresponding to the first electric field sensor is not within the standard range of the electric field intensity of the cable body, determining that the cable at the detection position of the first electric field sensor has insulation defects.
Or when the electric field intensity corresponding to the first electric field sensor is within the electric field intensity standard range of the cable body, and when the difference value of the electric field intensity of the first electric field sensor and the electric field intensity of the second electric field sensor is greater than a first preset value, the cable part between the first electric field sensor and the second electric field sensor is determined to have insulation defects.
Optionally, the thickness of the insulating layer of the cable body is greater than or equal to a preset thickness, and the cable body comprises three structural layers: sinle silk, insulating layer and shielding layer all are provided with electric field sensor on the primary importance of two at least structural layers of cable, are provided with electric field sensor on the same structural layer with the secondary location of primary importance interval default distance, and each electric field sensor all is connected with measuring equipment, and judgment module 603 still is used for:
and when the difference value of the electric field intensity corresponding to the electric field sensor of each structural layer at the first position is larger than a preset difference value, determining that the cable at the first position has insulation defects.
Optionally, the method further includes:
and when the electric field intensity corresponding to the electric field sensor positioned at the first position in each structural layer is within the electric field intensity standard range corresponding to each structural layer, and the difference value of the electric field intensity corresponding to the electric field sensor positioned at the first position in any two structural layers is greater than a preset difference value, determining that the cable has an insulation defect at the first position.
Or when the electric field intensity corresponding to the electric field sensor positioned at the first position in each structural layer is within the electric field intensity standard range corresponding to each structural layer, the difference value of the electric field intensity corresponding to the electric field sensor positioned at the first position in any two structural layers is smaller than or equal to a preset difference value, and the difference value of the electric field intensity corresponding to the electric field sensor positioned at the first position in the same structural layer and the electric field intensity corresponding to the electric field sensor positioned at the second position is larger than a second preset value, determining that the insulation defect exists in the part of the cable between the first position and the second position in the same structural layer.
Optionally, the test power supply connected to the cable body generates a voltage under an operating condition of one or more of the following cables: the obtaining module 601 is specifically configured to:
and acquiring a measuring signal of each electric field sensor under different operating conditions of the cable.
Optionally, a signal amplifier is connected between the measuring device and the electric field sensor, and the obtaining module 601 is further configured to:
and acquiring the measurement signal amplified by the signal amplifier.
Optionally, before processing the measurement signal to obtain the electric field strength of each detection position of the electric field sensor, the method further includes:
and amplifying the measurement signal of each electric field sensor.
The measurement device of this embodiment may be configured to perform the steps of the method for measuring the performance of the power cable in the first embodiment, and the specific implementation manner and the technical effect are similar and will not be described herein again.
Fig. 7 is a schematic structural diagram of a measurement apparatus according to a third embodiment of the present invention, and as shown in fig. 7, the apparatus 70 includes: the processor 701, the memory 702, the transceiver 703, and the memory 702 are configured to store instructions, the transceiver 703 is configured to communicate with other devices, and the processor 701 is configured to execute the instructions stored in the memory, so that the device 70 executes the steps of the method for measuring performance of a power cable according to the first embodiment.
A fourth embodiment of the present invention provides a computer-readable storage medium, where a computer-executable instruction is stored in the computer-readable storage medium, and the computer-executable instruction is used by a processor to implement the steps of the method for measuring performance of a power cable according to the first embodiment, where specific implementation manners and technical effects are similar, and are not described herein again.
A fifth embodiment of the present invention provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the method for measuring performance of a power cable according to the first embodiment are implemented, and the specific implementation manner and the technical effect are similar, which are not described herein again.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements 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 application is limited only by the appended claims.
Claims (10)
1. A performance measurement method of a power cable is applied to a measurement device, and the method comprises the following steps:
acquiring a measuring signal of at least one electric field sensor arranged on a cable, wherein the at least one electric field sensor is arranged on the surface and/or inside the cable body;
processing the measurement signals to obtain the electric field intensity of each detection position of the electric field sensor;
and judging whether the cable at the detection position of the electric field sensor has insulation defects or not according to the electric field intensity.
2. The method of claim 1, wherein the thickness of the insulation layer of the cable body is smaller than a preset thickness, the electric field sensors are disposed on the surface of the cable body at intervals of a preset distance, and the determining whether the cable at the detection position of the electric field sensor has an insulation defect according to the electric field strength comprises:
when the electric field intensity corresponding to the first electric field sensor is not within the standard range of the electric field intensity of the cable body, determining that the cable at the detection position of the first electric field sensor has an insulation defect;
or when the electric field intensity corresponding to the first electric field sensor is within the electric field intensity standard range of the cable body, and when the difference value of the electric field intensity of the first electric field sensor and the electric field intensity of the second electric field sensor is greater than a first preset value, determining that the insulation defect exists in the cable part between the first electric field sensor and the second electric field sensor.
3. The method of claim 1, wherein the thickness of the insulating layer of the cable body is greater than or equal to a predetermined thickness, the cable body comprising three structural layers: sinle silk, insulating layer and shielding layer, all be provided with electric field sensor on the primary importance of two at least structural layers of cable, on the same structural layer with be provided with electric field sensor on the second place of primary importance interval default distance, each electric field sensor all with measuring equipment connects, according to electric field strength, judge whether there is insulating defect in the cable that electric field sensor surveyed the position, include:
when the electric field intensity corresponding to the electric field sensor positioned at the first position in each structural layer is within the electric field intensity standard range corresponding to each structural layer, and the difference value of the electric field intensity corresponding to the electric field sensor positioned at the first position in any two structural layers is greater than a preset difference value, determining that the cable has an insulation defect at the first position;
or when the electric field intensity corresponding to the electric field sensor located at the first position in each structural layer is within the electric field intensity standard range corresponding to each structural layer, the difference value of the electric field intensities corresponding to the electric field sensors located at the first position in any two structural layers is smaller than or equal to the preset difference value, and the difference value of the electric field intensity corresponding to the electric field sensor located at the first position in the same structural layer and the electric field intensity corresponding to the electric field sensor located at the second position is larger than a second preset value, determining that the insulation defect exists in the part, between the first position and the second position, of the cable in the same structural layer.
4. The method of claim 1, wherein the test power source connected to the cable body generates a voltage under operating conditions of one or more of the following cables: the acquiring of the measurement signal of each electric field sensor includes:
and acquiring a measuring signal of each electric field sensor under different operating conditions of the cable.
5. The method according to claim 2 or 3, wherein a signal amplifier is connected between the measuring device and the electric field sensors, and the acquiring of the measuring signal of each electric field sensor comprises:
and acquiring the measurement signal amplified by the signal amplifier.
6. The method according to claim 2 or 3, wherein before processing the measurement signals to obtain the electric field strength of each of the detection positions of the electric field sensors, the method further comprises:
and amplifying the measurement signal of each electric field sensor.
7. A measurement device, comprising:
the acquisition module is used for acquiring a measurement signal of at least one electric field sensor arranged on the cable, and the at least one electric field sensor is arranged on the surface and/or inside the cable body;
the processing module is used for processing the measurement signals to obtain the electric field intensity of each detection position of the electric field sensor;
and the judging module is used for judging whether the cable at the detection position of the electric field sensor has insulation defects or not according to the electric field intensity.
8. A measurement device, comprising: a processor, and a memory communicatively coupled to the processor;
the memory stores computer-executable instructions;
the processor executes computer-executable instructions stored by the memory to implement the method of any of claims 1 to 6.
9. A computer-readable storage medium having computer-executable instructions stored thereon, which when executed by a processor, are configured to implement a method of measuring the performance of a power cable according to any one of claims 1 to 6.
10. A computer program product, characterized in that it comprises a computer program which, when executed by a processor, implements the method of any one of claims 1 to 6.
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| CN202210223220.5A CN114814479A (en) | 2022-03-07 | 2022-03-07 | Power cable performance measurement method, apparatus, storage medium, and program product |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024114377A1 (en) * | 2022-11-30 | 2024-06-06 | 广东电网有限责任公司东莞供电局 | Method and apparatus for evaluating performance of insulation-to-shielding matches for high-voltage alternating-current cables |
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- 2022-03-07 CN CN202210223220.5A patent/CN114814479A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024114377A1 (en) * | 2022-11-30 | 2024-06-06 | 广东电网有限责任公司东莞供电局 | Method and apparatus for evaluating performance of insulation-to-shielding matches for high-voltage alternating-current cables |
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