CN117147972A - Cable testing method and device, electronic equipment and medium - Google Patents
Cable testing method and device, electronic equipment and medium Download PDFInfo
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- CN117147972A CN117147972A CN202311423663.XA CN202311423663A CN117147972A CN 117147972 A CN117147972 A CN 117147972A CN 202311423663 A CN202311423663 A CN 202311423663A CN 117147972 A CN117147972 A CN 117147972A
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- 238000012360 testing method Methods 0.000 title claims abstract description 231
- 230000005284 excitation Effects 0.000 claims abstract description 184
- 238000005259 measurement Methods 0.000 claims abstract description 65
- 238000009413 insulation Methods 0.000 claims description 182
- 239000002184 metal Substances 0.000 claims description 86
- 239000010410 layer Substances 0.000 claims description 59
- 239000011241 protective layer Substances 0.000 claims description 33
- 238000007689 inspection Methods 0.000 claims description 8
- 238000010998 test method Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 14
- 238000010586 diagram Methods 0.000 description 5
- 230000010363 phase shift Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000016507 interphase Effects 0.000 description 2
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- 210000000709 aorta Anatomy 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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- G—PHYSICS
- 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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- Testing Relating To Insulation (AREA)
Abstract
The invention provides a cable testing method, a device, electronic equipment and a medium, which are suitable for the technical field of power cables and can effectively improve the cable testing efficiency. The method comprises the following steps: the control module can automatically send excitation voltage generation parameters to the carrier phase-shifting pulse width modulation generator according to the cable test item and the excitation voltage so that the carrier phase-shifting pulse width modulation generator generates pulse width modulation signals and sends the pulse width modulation signals to the multi-unit serial inverter, and the multi-unit serial inverter can automatically generate the excitation voltage according to the pulse width modulation signals and apply the excitation voltage to the tested cable; accordingly, the control module may receive the measurement result of the tested cable from the measurement module and automatically determine whether the tested cable passes the cable test item according to the measurement result.
Description
Technical Field
The invention belongs to the technical field of power cables, and particularly relates to a cable testing method, a device, electronic equipment and a medium.
Background
The power cable line is an aorta supplied by urban energy, and the mileage of the cable line is rapidly increased along with the continuous acceleration of urban process in China, so that the cable test and detection work is more challenged. Traditional cable test equipment has the advantages of various types, single function, complicated wiring or debugging, high requirements on the professional level and practical experience of electric power station personnel, low working efficiency and increasingly inadaptation to modern electric power development ways.
Disclosure of Invention
The invention provides a cable testing method, a device, electronic equipment and a medium, which can effectively improve the efficiency of cable testing.
Aiming at the problems, the invention adopts the following technical scheme:
in a first aspect, a cable testing method is provided, including:
the control module sends excitation voltage generation parameters to the carrier phase-shifting pulse width modulation generator according to the cable test item and the excitation voltage, the excitation voltage generation parameters are used for the carrier phase-shifting pulse width modulation generator to generate pulse width modulation signals, the pulse width modulation signals are used for the multi-unit series inverter to generate the excitation voltage, and the excitation voltage is applied to the tested cable to finish the cable test item;
the control module receives a measurement result of the cable to be measured from the measurement module;
and the control module determines whether the tested cable passes through the cable test item according to the measurement result of the tested cable.
Optionally, the cable test items include a main insulation resistance test and an outer jacket insulation resistance test;
the excitation voltage comprises a first direct current excitation voltage, wherein the first direct current excitation voltage is applied between the wire core of the tested cable and the metal protection layer, and between the metal protection layer of the tested cable and the grounding end;
The measuring result comprises a first direct current phase voltage and a first direct current phase current between the wire core of the cable to be measured and the metal protective layer, or a second direct current phase voltage and a second direct current phase current between the metal protective layer of the cable to be measured and the grounding end;
the main insulation resistance of the tested cable is the ratio of the first direct-current phase voltage to the first direct-current phase current between the wire core of the tested cable and the metal protection layer;
the insulation resistance of the first outer sheath of the tested cable is the ratio of the second direct current phase voltage to the second direct current phase current between the metal protection layer and the grounding end of the tested cable;
the control module determines whether the tested cable passes through the cable test item according to the measurement result of the tested cable, and comprises the following steps:
if the main insulation resistance of the tested cable is larger than or equal to the main insulation resistance threshold value, the control module confirms that the tested cable passes the main insulation resistance test;
and if the insulation resistance of the first outer sheath of the tested cable is greater than or equal to the insulation resistance threshold of the outer sheath, the control module confirms that the tested cable passes the insulation resistance test of the outer sheath.
Optionally, the cable test item further comprises a main insulation capacitance test;
the excitation voltage comprises a first alternating current excitation voltage which is applied between the wire core of the tested cable and the metal protection layer;
The measuring result comprises a first alternating-current phase voltage and a first alternating-current phase current between the wire core of the cable to be measured and the metal protective layer;
the main insulation capacitance of the tested cable satisfies the following conditions:，Cis the main insulation capacitance of the tested cable, +.>For the first alternating phase voltage between the core of the tested cable and the metallic protection layer +.>For a first alternating phase current between the core of the cable under test and the metallic sheath,Rfor the main insulation resistance of the cable under test,fa frequency that is the first ac excitation voltage;
the control module determines whether the tested cable passes through the cable test item according to the measurement result of the tested cable, and comprises the following steps:
and if the main insulation capacitance of the tested cable is larger than or equal to the main insulation capacitance threshold value, the control module confirms that the tested cable passes the main insulation capacitance test.
Optionally, the cable test item further comprises: testing the main insulation alternating current withstand voltage;
the excitation voltage comprises a second alternating current excitation voltage, and the second alternating current excitation voltage comprises a plurality of alternating current voltages which are sequentially applied between the wire core of the tested cable and the metal protective layer from small to large;
the measuring result comprises a plurality of groups of second alternating-current phase voltages and second alternating-current phase currents which are changed from small to large between the wire core of the cable to be measured and the metal protective layer, and the plurality of groups of second alternating-current phase voltages and second alternating-current phase currents are used for determining a plurality of main insulation impedances of the cable to be measured;
The control module determines whether the tested cable passes through the cable test item according to the measurement result of the tested cable, and comprises the following steps:
and if the deviation among the plurality of main insulation impedances is smaller than or equal to the main insulation impedance deviation threshold value, the control module confirms that the tested cable passes the main insulation alternating current withstand voltage test.
Optionally, the cable test item further comprises: the direct current withstand voltage test of the outer sheath;
the excitation voltage comprises a second direct current excitation voltage which is applied between the metal protection layer and the grounding end of the tested cable;
the measurement result comprises a third direct current phase voltage and a third direct current phase current between the metal protection layer and the grounding end of the cable to be measured;
the insulation resistance of the second outer sheath of the tested cable is the ratio of the third direct current phase voltage to the third direct current phase current between the metal protection layer and the grounding end of the tested cable;
the control module determines whether the tested cable passes through the cable test item according to the measurement result of the tested cable, and comprises the following steps:
if the insulation resistance of the second outer sheath of the tested cable is larger than or equal to the insulation resistance threshold of the outer sheath, the control module confirms that the tested cable passes the direct-current voltage withstand test of the outer sheath.
Optionally, the cable test item includes a cable both-end phase check of the cable under test;
The excitation voltages comprise three groups of third direct current excitation voltages, the three groups of third direct current excitation voltages are sequentially applied between the three-phase wire core and the grounding end of the tested cable, each group of third direct current excitation voltages comprises a non-zero single-phase direct current excitation voltage and two zero-value single-phase direct current excitation voltages, the values of the non-zero single-phase direct current excitation voltages in the three groups of third direct current excitation voltages are different, and the three excitation voltages in each group of third direct current excitation voltages are respectively applied between the three-phase wire core and the grounding end of the tested cable;
the measurement result comprises fourth direct current phase voltages between the three-phase wire cores of the three groups of cables to be measured and the grounding end, and each group of fourth direct current phase voltages is used for determining the phase of the other end of the cable to be measured;
the control module determines whether the tested cable passes through the cable test item according to the measurement result of the tested cable, and comprises the following steps:
if the phases of the three-phase wire cores at the other end of the tested cable are respectively consistent with the phases of the three-phase wire cores at the local end of the tested cable, the control module confirms that the three-phase cable passes through the phase inspection at the two ends of the cable.
Optionally, the method further comprises: the control module receives a cable test item and an excitation voltage.
In a second aspect, there is provided a cable testing device comprising: the device comprises a control module, a carrier phase-shifting pulse width modulation generator, a multi-unit series inverter and a measuring module; wherein,
The control module is used for sending excitation voltage generation parameters to the carrier phase-shifting pulse width modulation generator according to the cable test item and the excitation voltage;
the carrier phase-shifting pulse width modulation generator is used for generating a pulse width modulation signal according to the excitation voltage generation parameter and sending the parameter to the multi-unit series inverter to generate the pulse width modulation signal;
the multi-unit serial inverter is used for generating excitation voltage according to the pulse width modulation signal, and the excitation voltage is applied to the tested cable and used for completing a cable test project;
the control module is also used for receiving the measurement result of the cable to be measured from the measurement module;
and the control module is also used for determining whether the tested cable passes through the cable test item according to the measurement result of the tested cable.
Optionally, the cable test items include a main insulation resistance test and an outer jacket insulation resistance test;
the excitation voltage comprises a first direct current excitation voltage, wherein the first direct current excitation voltage is applied between the wire core of the tested cable and the metal protection layer, and between the metal protection layer of the tested cable and the grounding end;
the measuring result comprises a first direct current phase voltage and a first direct current phase current between the wire core of the cable to be measured and the metal protective layer, or a second direct current phase voltage and a second direct current phase current between the metal protective layer of the cable to be measured and the grounding end;
The main insulation resistance of the tested cable is the ratio of the first direct-current phase voltage to the first direct-current phase current between the wire core of the tested cable and the metal protection layer;
the insulation resistance of the first outer sheath of the tested cable is the ratio of the second direct current phase voltage to the second direct current phase current between the metal protection layer and the grounding end of the tested cable;
the control module is also used for confirming that the tested cable passes the main insulation resistance test if the main insulation resistance of the tested cable is larger than or equal to the main insulation resistance threshold value;
and the control module is also used for confirming that the tested cable passes the outer sheath insulation resistance test if the first outer sheath insulation resistance of the tested cable is larger than or equal to the outer sheath insulation resistance threshold value.
Optionally, the cable test item further comprises a main insulation capacitance test;
the excitation voltage comprises a first alternating current excitation voltage which is applied between the wire core of the tested cable and the metal protection layer;
the measuring result comprises a first alternating-current phase voltage and a first alternating-current phase current between the wire core of the cable to be measured and the metal protective layer;
the main insulation capacitance of the tested cable satisfies the following conditions:，Cis the main insulation capacitance of the tested cable, +.>For the first alternating phase voltage between the core of the tested cable and the metallic protection layer +. >For a first alternating phase current between the core of the cable under test and the metallic sheath,Rfor the main insulation resistance of the cable under test,fa frequency that is the first ac excitation voltage;
and the control module is also used for confirming that the tested cable passes the main insulation capacitance test if the main insulation capacitance of the tested cable is larger than or equal to the main insulation capacitance threshold value.
Optionally, the cable test item further comprises: testing the main insulation alternating current withstand voltage;
the excitation voltage comprises a second alternating current excitation voltage, and the second alternating current excitation voltage comprises a plurality of alternating current voltages which are sequentially applied between the wire core of the tested cable and the metal protective layer from small to large;
the measuring result comprises a plurality of groups of second alternating-current phase voltages and second alternating-current phase currents which are changed from small to large between the wire core of the cable to be measured and the metal protective layer, and the plurality of groups of second alternating-current phase voltages and second alternating-current phase currents are used for determining a plurality of main insulation impedances of the cable to be measured;
and the control module is also used for confirming that the tested cable passes the main insulation alternating current withstand voltage test if the deviation among the plurality of main insulation impedances is smaller than or equal to the main insulation impedance deviation threshold value.
Optionally, the cable test item further comprises: the direct current withstand voltage test of the outer sheath;
The excitation voltage comprises a second direct current excitation voltage which is applied between the metal protection layer and the grounding end of the tested cable;
the measurement result comprises a third direct current phase voltage and a third direct current phase current between the metal protection layer and the grounding end of the cable to be measured;
the insulation resistance of the second outer sheath of the tested cable is the ratio of the third direct current phase voltage to the third direct current phase current between the metal protection layer and the grounding end of the tested cable;
and the control module is also used for confirming that the tested cable passes the outer sheath direct current withstand voltage test if the insulation resistance of the second outer sheath of the tested cable is larger than or equal to the insulation resistance threshold value of the outer sheath.
Optionally, the cable test item includes a cable both-end phase check of the cable under test;
the excitation voltages comprise three groups of third direct current excitation voltages, the three groups of third direct current excitation voltages are sequentially applied between the three-phase wire core and the grounding end of the tested cable, each group of third direct current excitation voltages comprises a non-zero single-phase direct current excitation voltage and two zero-value single-phase direct current excitation voltages, the values of the non-zero single-phase direct current excitation voltages in the three groups of third direct current excitation voltages are different, and the three excitation voltages in each group of third direct current excitation voltages are respectively applied between the three-phase wire core and the grounding end of the tested cable;
The measurement result comprises fourth direct current phase voltages between the three-phase wire cores of the three groups of cables to be measured and the grounding end, and each group of fourth direct current phase voltages is used for determining the phase of the other end of the cable to be measured;
and the control module is also used for confirming that the three-phase cable passes through the phase inspection at the two ends of the cable if the phases of the three-phase wire cores at the other end of the tested cable are respectively consistent with the phases of the three-phase wire cores at the local end of the tested cable.
Optionally, the control module is further configured to receive a cable test item and an excitation voltage.
In a third aspect, there is provided an electronic device comprising: a processor coupled to the memory;
wherein the processor is configured to read and execute a program or instructions stored in the memory, so that the apparatus performs the method according to the first aspect.
In a fourth aspect, there is provided a computer readable storage medium storing a program or instructions which, when read and executed by a computer, cause the computer to perform the method of the first aspect.
Based on the cable testing method, the device, the electronic equipment and the medium provided by the invention, the control module can automatically send the excitation voltage generation parameters to the carrier phase-shifting pulse width modulation generator according to the cable testing project and the excitation voltage, so that the carrier phase-shifting pulse width modulation generator can generate pulse width modulation signals and send the pulse width modulation signals to the multi-unit serial inverter, and the multi-unit serial inverter can automatically generate the excitation voltage according to the pulse width modulation signals and apply the excitation voltage to the tested cable; correspondingly, the control module can receive the measurement result of the tested cable from the measurement module and automatically determine whether the tested cable passes through the cable test items according to the measurement result, that is, under the unified coordination of the control module, all the test items can be completed by only carrying out one-time wiring on the tested cable, repeated wiring and wiring removal on a plurality of test devices are not needed, a large amount of time can be saved, and thus the test efficiency of the tested cable is effectively improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a cable testing platform according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a cable testing method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a cable testing device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
First, referring to fig. 1, a cable testing platform according to an embodiment of the present invention is described.
As shown in fig. 1, the platform includes: the device comprises a touch screen (an upper computer), a control module, a carrier phase-shift pulse width modulation (Pulse Width Modulation, PWM) generator, a multi-unit series inverter and a measurement module.
The platform three-phase voltage output lines may be connected to the ABC three-phase core of the cable under test or to the cable metal shield (metal sheath) before the cable test project is performed on the cable under test.
The touch screen is a man-machine interaction device in the cable testing process and is used for inputting cable test items and outputting measurement results obtained by a measurement unit, and testing results (qualified or unqualified, identified phases and the like at the other end of a tested cable) of each cable test item.
Among other things, cable test items include, but are not limited to: the method comprises the steps of main insulation resistance test, outer sheath insulation resistance test, main insulation capacitance test, main insulation alternating current withstand voltage test, outer sheath direct current withstand voltage test and phase inspection at two ends of a cable.
Specifically, each cable test item corresponds to different types of excitation voltages, the touch screen can be used for setting amplitude, phase and the like of the excitation voltages, and can also display phase voltages, phase currents, main insulation resistances, outer sheath insulation resistances, main insulation capacitances, main insulation alternating current withstand voltage test results, outer sheath direct current withstand voltage test results, phase inspection results and the like of the tested cable.
It should be noted that, the cable test item and the corresponding excitation voltage may be manually input by the user through the local device, such as through a touch screen, or may be obtained from a remote device, which is not limited in the embodiments of the present invention. For example, the platform may further comprise a communication module, such as a transceiver, through which the control module may receive the cable test item and the corresponding stimulus voltage from the remote device.
The control module is a control center of the platform and is used for sending control instructions to the carrier phase-shifting PWM generator according to the cable test item and the set value of the excitation voltage and combining the measured phase voltage and phase current, as shown in figure 1、/>、Can also treat abnormal conditions, calculate insulation resistance or capacitance of the cable orImpedance, implementation of closed loop control, etc.
The carrier phase-shifting PWM generator can generate a plurality of PWM signals required by the multi-unit series inverter according to the control instruction sent by the control module, as shown in FIG. 1pwm-1,pwm-2…,pwm-n；
The multi-unit series inverter is a main loop of the platform, and is used for generating preset excitation voltage according to a plurality of PWM signals and applying the excitation voltage to a wire core or an insulation structure of a tested cable.
A measurement module for measuring the phase voltage applied to the cable under test (as shown in FIG. 1 u a 、u b ) Phase current (as in figure 1i a 、i b ) The system can be used for alarming and processing abnormal conditions of the system, and can also form configuration parameters of cable test items and excitation voltages together with parameters input by a touch screen.
The following describes in detail a cable testing method according to an embodiment of the present invention with reference to fig. 2.
Fig. 2 is a schematic flow chart of a cable testing method according to an embodiment of the present invention. The method can be applied to the cable test platform shown in fig. 1. As shown in fig. 2, the method includes:
s201, the control module sends excitation voltage generation parameters to the carrier phase-shifting pulse width modulation generator according to the cable test item and the excitation voltage;
s202, a carrier phase-shifting pulse width modulation generator generates a pulse width modulation signal according to the excitation voltage and parameters sent to a multi-unit series inverter;
s203, generating excitation voltage by the multi-unit serial inverter according to the pulse width modulation signal, wherein the excitation voltage is applied to a tested cable and used for completing a cable test project;
s204, the control module receives the measurement result of the cable to be measured from the measurement module;
s205, the control module determines whether the tested cable passes through the cable test item according to the measured result of the tested cable.
Optionally, the cable test items include a main insulation resistance test and an outer jacket insulation resistance test;
the excitation voltage comprises a first direct current excitation voltage, wherein the first direct current excitation voltage is applied between the wire core of the tested cable and the metal protection layer, and between the metal protection layer of the tested cable and the grounding end;
the measuring result comprises a first direct current phase voltage and a first direct current phase current between the wire core of the cable to be measured and the metal protective layer, or a second direct current phase voltage and a second direct current phase current between the metal protective layer of the cable to be measured and the grounding end;
the main insulation resistance of the tested cable is the ratio of the first direct-current phase voltage to the first direct-current phase current between the wire core of the tested cable and the metal protection layer;
the insulation resistance of the first outer sheath of the tested cable is the ratio of the second direct current phase voltage to the second direct current phase current between the metal protection layer and the grounding end of the tested cable;
accordingly, S205, the control module determines, according to the measurement result of the tested cable, whether the tested cable passes the cable test item, including:
if the main insulation resistance of the tested cable is larger than or equal to the main insulation resistance threshold value, the control module confirms that the tested cable passes the main insulation resistance test;
And if the insulation resistance of the first outer sheath of the tested cable is greater than or equal to the insulation resistance threshold of the outer sheath, the control module confirms that the tested cable passes the insulation resistance test of the outer sheath.
The first direct current excitation voltage and the second direct current excitation voltage can be single-phase direct current voltage or three-phase direct current voltage. When the voltage is single-phase direct-current voltage, the voltage can be sequentially applied between the three-phase wire cores or the metal protective layers of the tested cable and between the metal protective layers of the tested cable wrapping the three-phase wire cores and the grounding end; when the voltage is single-phase direct current voltage, the voltage can be simultaneously applied between the three-phase wire cores or the metal protective layers of the tested cable and between the metal protective layers of the tested cable wrapping the three-phase wire cores and the grounding end, and the embodiment of the invention is not limited.
Correspondingly, the control module can calculate the main insulation resistance and the first outer sheath insulation resistance of the tested cable according to the phase voltage and the phase current of the tested cable measured by the measurement module, and the specific formula is as follows:
，
wherein,Rfor the main insulation resistance of the cable under test,and->The first direct current phase voltage and the first direct current phase current are respectively between the wire core of the tested cable and the metal protective layer;
Or,Rfor the insulation resistance of the first outer sheath of the cable under test,and->The second direct current phase voltage and the second direct current phase current are respectively arranged between the metal protection layer and the grounding end of the tested cable.
Then, the control module can judge whether the main insulation resistance of the tested cable is greater than or equal to a main insulation resistance threshold value and whether the first outer sheath insulation resistance is greater than or equal to an outer sheath insulation resistance threshold value, if so, the tested cable passes through the corresponding cable test item.
Optionally, the cable test item further comprises a main insulation capacitance test;
the excitation voltage comprises a first alternating current excitation voltage which is applied between the wire core of the tested cable and the metal protection layer;
the measuring result comprises a first alternating-current phase voltage and a first alternating-current phase current between the wire core of the cable to be measured and the metal protective layer;
the main insulation capacitance of the tested cable satisfies the following conditions:，Cis the main insulation capacitance of the tested cable, +.>For the first alternating phase voltage between the core of the tested cable and the metallic protection layer +.>For a first alternating phase current between the core of the cable under test and the metallic sheath,Rfor the main insulation resistance of the cable under test,fa frequency for the first ac excitation voltage, such as 50 Hertz (Hz) or 60Hz;
Accordingly, S205, the control module determines, according to the measurement result of the tested cable, whether the tested cable passes the cable test item, including:
and if the main insulation capacitance of the tested cable is larger than or equal to the main insulation capacitance threshold value, the control module confirms that the tested cable passes the main insulation capacitance test.
Optionally, the cable test item further comprises: testing the main insulation alternating current withstand voltage;
the excitation voltage comprises a second alternating current excitation voltage, and the second alternating current excitation voltage comprises a plurality of alternating current voltages which are sequentially applied between the wire core of the tested cable and the metal protective layer from small to large;
the measuring result comprises a plurality of groups of second alternating-current phase voltages and second alternating-current phase currents which are changed from small to large between the wire core of the cable to be measured and the metal protective layer, and the plurality of groups of second alternating-current phase voltages and second alternating-current phase currents are used for determining a plurality of main insulation impedances of the cable to be measured;
accordingly, S205, the control module determines, according to the measurement result of the tested cable, whether the tested cable passes the cable test item, including:
and if the deviation among the plurality of main insulation impedances is smaller than or equal to the main insulation impedance deviation threshold value, the control module confirms that the tested cable passes the main insulation alternating current withstand voltage test.
Wherein, the main insulation resistance of the cable under test satisfies:，Zfor the main insulation resistance of the cable under test,Rfor the cable to be testedIs used for the main insulation resistance of the (a),fat the frequency of the second ac excitation voltage,Cis the main insulation capacitance.
When a plurality of alternating voltages with different magnitudes in the second alternating-current excitation voltage are applied to the wire core of the tested cable, if the main insulation resistance and the main insulation capacitance are calculated according to the measured multiple groups of second alternating-current phase voltages and second alternating-current phase currents, and the calculated main insulation resistance value is relatively close to and is not 0, the tested cable is not broken down, the main insulation alternating-current withstand voltage test passes, otherwise, if the value of the main insulation resistance value is suddenly reduced and even is close to 0 in the process of gradually increasing the second alternating-current excitation voltage, the tested cable is broken down, and the main insulation withstand voltage test fails.
Optionally, the cable test item further comprises: the direct current withstand voltage test of the outer sheath;
the excitation voltage comprises a second direct current excitation voltage which is applied between the metal protection layer and the grounding end of the tested cable;
the measurement result comprises a third direct current phase voltage and a third direct current phase current between the metal protection layer and the grounding end of the cable to be measured;
The insulation resistance of the second outer sheath of the tested cable is the ratio of the third direct current phase voltage to the third direct current phase current between the metal protection layer and the grounding end of the tested cable;
accordingly, S205, the control module determines, according to the measurement result of the tested cable, whether the tested cable passes the cable test item, including:
if the insulation resistance of the second outer sheath of the tested cable is larger than or equal to the insulation resistance threshold of the outer sheath, the control module confirms that the tested cable passes the direct-current voltage withstand test of the outer sheath.
Optionally, the cable test item includes a cable both-end phase check of the cable under test;
the excitation voltages comprise three groups of third direct current excitation voltages, the three groups of third direct current excitation voltages are sequentially applied between the three-phase wire core and the grounding end of the tested cable, each group of third direct current excitation voltages comprises a non-zero single-phase direct current excitation voltage and two zero-value single-phase direct current excitation voltages, the values of the non-zero single-phase direct current excitation voltages in the three groups of third direct current excitation voltages are different, and the three excitation voltages in each group of third direct current excitation voltages are respectively applied between the three-phase wire core and the grounding end of the tested cable;
the measurement result comprises fourth direct current phase voltages between the three-phase wire cores of the three groups of cables to be measured and the grounding end, and each group of fourth direct current phase voltages is used for determining the phase of the other end of the cable to be measured;
Accordingly, S205, the control module determines, according to the measurement result of the tested cable, whether the tested cable passes the cable test item, including:
if the phases of the three-phase wire cores at the other end of the tested cable are respectively consistent with the phases of the three-phase wire cores at the local end of the tested cable, the control module confirms that the three-phase cable passes through the phase inspection at the two ends of the cable.
Illustratively, the three sets of third dc excitation voltages may be respectively: and (10V, 0V), (0V, 20V, 0V), (0V, 0V and 30V) are sequentially applied to the local three-phase core of the tested cable, if only 1 of the phase voltages of the opposite three-phase core of the tested cable is a non-zero value voltage and the non-zero value voltage is close to the non-zero value voltage applied to a certain phase core of the local end, the local end core applied with the non-zero value voltage and the opposite end core with the non-zero value voltage correspond to the same core, namely the two cores are in phase, so that the corresponding relation between the local three-phase core and the opposite three-phase core of the tested cable is obtained, and the phase test of the tested cable is completed. For example, assuming that the local three-phase core of the tested cable is labeled ABC, the other end is labeled ABC, the local three-phase core ABC of the tested cable is sequentially applied with (10V, 0V), (0V, 20V, 0V), (0V, 30V), and the sequence in which the non-zero voltage values appear in the opposite three-phase core of the tested cable is cba, the local opposite correspondence of the three-phase core of the tested cable may be determined as: a < - > C, B < - > B, C < - > a.
And if a certain group of third direct current excitation voltages are applied to the three-phase wire cores at the local end of the tested cable, two or three of the three-phase wire cores at the opposite end of the tested cable have non-zero value voltages, the fact that the tested cable has interphase short circuit faults is indicated; or, if the opposite end three-phase wire cores of the tested cable are zero-value voltages, it is indicated that at least one phase of the three-phase wire cores of the tested cable has an open circuit fault, such as poor contact of the adapter, disconnection of the wire cores, and the like. That is, when an inter-phase short-circuit fault or an open-circuit fault occurs, the correspondence relationship of the local-end three-phase core and the opposite-end three-phase core of the measured cable may be difficult to determine, and in this case, it may be regarded that the phases of the two ends of the measured cable are inconsistent.
It should be noted that the embodiments of the present invention relate to various thresholds, such as a main insulation resistance threshold, an outer sheath insulation resistance threshold, a main insulation capacitance threshold, a main insulation resistance deviation threshold, etc., which may be determined according to the design specification and the actual requirement of the tested cable, and the embodiments of the present invention are not limited.
Optionally, the method further comprises the steps of: the control module receives a cable test item and an excitation voltage.
In particular, the control module may receive the cable test item and the stimulus voltage from an input/output device, such as a touch screen, or a remote device, although embodiments of the invention are not limited.
Based on the cable test method provided by the invention, the control module can automatically send excitation voltage generation parameters to the carrier phase-shift pulse width modulation generator according to a cable test item and excitation voltage, so that the carrier phase-shift pulse width modulation generator generates pulse width modulation signals and sends the pulse width modulation signals to the multi-unit serial inverter, and the multi-unit serial inverter can automatically generate the excitation voltage according to the pulse width modulation signals and apply the excitation voltage to a tested cable; correspondingly, the control module can receive the measurement result of the tested cable from the measurement module and automatically determine whether the tested cable passes through the cable test items according to the measurement result, that is, under the unified coordination of the control module, all the test items can be completed by only carrying out one-time wiring on the tested cable, repeated wiring and wiring removal on a plurality of test devices are not needed, a large amount of time can be saved, and thus the test efficiency of the tested cable is effectively improved.
The cable testing method provided by the embodiment of the invention is described in detail above with reference to fig. 2, and the cable testing device and the electronic device provided by the embodiment of the invention are respectively described below with reference to fig. 3 and fig. 4.
Fig. 3 is a schematic structural diagram of a cable testing device according to an embodiment of the present invention. The device can execute the cable testing method described in the method embodiment.
As shown in fig. 3, the cable testing device 300 includes: a control module 301, a carrier phase-shift pulse width modulation generator 302, a multi-unit series inverter 303 and a measurement module 304; wherein,
a control module 301, configured to send an excitation voltage generation parameter to a carrier phase-shifting pulse width modulation generator 302 according to a cable test item and an excitation voltage;
a carrier phase-shifting pwm generator 302, configured to generate a pwm signal according to the excitation voltage generation parameter, and send the parameter generation pwm signal to the multi-unit serial inverter 303;
a multi-unit series inverter 303 for generating an excitation voltage according to the pulse width modulation signal, the excitation voltage being applied to the cable under test for completing the cable test project;
the control module 301 is further configured to receive a measurement result of the cable to be measured from the measurement module 304;
the control module 301 is further configured to determine whether the tested cable passes the cable test item according to the measurement result of the tested cable.
Optionally, the cable test items include a main insulation resistance test and an outer jacket insulation resistance test;
the excitation voltage comprises a first direct current excitation voltage, wherein the first direct current excitation voltage is applied between the wire core of the tested cable and the metal protection layer, and between the metal protection layer of the tested cable and the grounding end;
The measuring result comprises a first direct current phase voltage and a first direct current phase current between the wire core of the cable to be measured and the metal protective layer, or a second direct current phase voltage and a second direct current phase current between the metal protective layer of the cable to be measured and the grounding end;
the main insulation resistance of the tested cable is the ratio of the first direct-current phase voltage to the first direct-current phase current between the wire core of the tested cable and the metal protection layer;
the insulation resistance of the first outer sheath of the tested cable is the ratio of the second direct current phase voltage to the second direct current phase current between the metal protection layer and the grounding end of the tested cable;
the control module 301 is further configured to confirm that the tested cable passes the main insulation resistance test if the main insulation resistance of the tested cable is greater than or equal to the main insulation resistance threshold;
the control module 301 is further configured to confirm that the cable under test passes the outer sheath insulation resistance test if the first outer sheath insulation resistance of the cable under test is greater than or equal to the outer sheath insulation resistance threshold.
Optionally, the cable test item further comprises a main insulation capacitance test;
the excitation voltage comprises a first alternating current excitation voltage which is applied between the wire core of the tested cable and the metal protection layer;
The measuring result comprises a first alternating-current phase voltage and a first alternating-current phase current between the wire core of the cable to be measured and the metal protective layer;
the main insulation capacitance of the tested cable satisfies the following conditions:，Cis the main insulation capacitance of the tested cable, +.>For the first alternating phase voltage between the core of the tested cable and the metallic protection layer +.>For a first alternating phase current between the core of the cable under test and the metallic sheath,Rfor the main insulation resistance of the cable under test,fa frequency that is the first ac excitation voltage;
the control module 301 is further configured to confirm that the cable under test passes the primary insulation capacitance test if the primary insulation capacitance of the cable under test is greater than or equal to the primary insulation capacitance threshold.
Optionally, the cable test item further comprises: testing the main insulation alternating current withstand voltage;
the excitation voltage comprises a second alternating current excitation voltage, and the second alternating current excitation voltage comprises a plurality of alternating current voltages which are sequentially applied between the wire core of the tested cable and the metal protective layer from small to large;
the measuring result comprises a plurality of groups of second alternating-current phase voltages and second alternating-current phase currents which are changed from small to large between the wire core of the cable to be measured and the metal protective layer, and the plurality of groups of second alternating-current phase voltages and second alternating-current phase currents are used for determining a plurality of main insulation impedances of the cable to be measured;
The control module 301 is further configured to confirm that the tested cable passes the main insulation ac voltage withstand test if a deviation between the plurality of main insulation impedances is less than or equal to a main insulation impedance deviation threshold.
Optionally, the cable test item further comprises: the direct current withstand voltage test of the outer sheath;
the excitation voltage comprises a second direct current excitation voltage which is applied between the metal protection layer and the grounding end of the tested cable;
the measurement result comprises a third direct current phase voltage and a third direct current phase current between the metal protection layer and the grounding end of the cable to be measured;
the insulation resistance of the second outer sheath of the tested cable is the ratio of the third direct current phase voltage to the third direct current phase current between the metal protection layer and the grounding end of the tested cable;
the control module 301 is further configured to confirm that the tested cable passes the outer sheath dc voltage withstand test if the second outer sheath insulation resistance of the tested cable is greater than or equal to the outer sheath insulation resistance threshold.
Optionally, the cable test item includes a cable both-end phase check of the cable under test;
the excitation voltages comprise three groups of third direct current excitation voltages, the three groups of third direct current excitation voltages are sequentially applied between the three-phase wire core and the grounding end of the tested cable, each group of third direct current excitation voltages comprises a non-zero single-phase direct current excitation voltage and two zero-value single-phase direct current excitation voltages, the values of the non-zero single-phase direct current excitation voltages in the three groups of third direct current excitation voltages are different, and the three excitation voltages in each group of third direct current excitation voltages are respectively applied between the three-phase wire core and the grounding end of the tested cable;
The measurement result comprises fourth direct current phase voltages between the three-phase wire cores of the three groups of cables to be measured and the grounding end, and each group of fourth direct current phase voltages is used for determining the phase of the other end of the cable to be measured;
the control module 301 is further configured to confirm that the three-phase cable passes the phase inspection at two ends of the cable if phases of the three-phase wire cores at the other end of the tested cable are respectively consistent with phases of the three-phase wire cores at the local end of the tested cable.
Optionally, the control module 301 is further configured to receive a cable test item and an excitation voltage.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
As shown in fig. 4, the electronic device 400 includes: a processor 401, the processor 401 being coupled to the memory 402;
the processor 401 is configured to read and execute a program or instructions stored in the memory 402, so that the electronic device 400 performs the cable testing method shown in fig. 2.
Optionally, the electronic device 400 may also include a transceiver 403 for the electronic device 400 to communicate with other devices.
For convenience of description, fig. 3 and 4 show only main components of the cable test device 300 and the electronic apparatus 400, respectively. In practice, the cable testing apparatus 300 and the electronic device 400 may also include components or assemblies not shown in the figures.
The embodiment of the present invention also provides a computer-readable storage medium storing a program or instructions that, when read and executed by a computer, cause the computer to perform the method described in the above method embodiment.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (16)
1. A method of testing a cable, comprising:
the control module sends excitation voltage generation parameters to the carrier phase-shifting pulse width modulation generator according to a cable test item and excitation voltage, wherein the excitation voltage generation parameters are used for the carrier phase-shifting pulse width modulation generator to generate pulse width modulation signals, the pulse width modulation signals are used for the multi-unit series inverter to generate excitation voltage, and the excitation voltage is applied to a tested cable and used for completing the cable test item;
the control module receives the measurement result of the cable to be measured from the measurement module;
And the control module determines whether the tested cable passes through the cable test item according to the measurement result of the tested cable.
2. The cable testing method of claim 1, wherein the cable test items include a main insulation resistance test and an outer jacket insulation resistance test;
the excitation voltage comprises a first direct current excitation voltage which is applied between the wire core of the tested cable and the metal protection layer, and between the metal protection layer of the tested cable and the grounding end;
the measurement result comprises a first direct-current phase voltage and a first direct-current phase current between the wire core of the tested cable and the metal protection layer, or a second direct-current phase voltage and a second direct-current phase current between the metal protection layer of the tested cable and the grounding end;
the main insulation resistance of the tested cable is the ratio of a first direct current phase voltage to a first direct current phase current between a wire core of the tested cable and a metal protective layer;
the insulation resistance of the first outer sheath of the tested cable is the ratio of the second direct-current phase voltage to the second direct-current phase current between the metal protection layer and the grounding end of the tested cable;
The control module determines whether the tested cable passes through the cable test item according to the measurement result of the tested cable, and comprises the following steps:
if the main insulation resistance of the tested cable is greater than or equal to a main insulation resistance threshold, the control module confirms that the tested cable passes the main insulation resistance test;
and if the insulation resistance of the first outer sheath of the tested cable is greater than or equal to the insulation resistance threshold of the outer sheath, the control module confirms that the tested cable passes the insulation resistance test of the outer sheath.
3. The cable testing method of claim 2, wherein the cable test item further comprises a main insulation capacitance test;
the excitation voltage comprises a first alternating current excitation voltage which is applied between the wire core of the tested cable and the metal protection layer;
the measurement result comprises a first alternating-current phase voltage and a first alternating-current phase current between the wire core of the tested cable and the metal protection layer;
the main insulation capacitance of the tested cable meets the following conditions:，Cfor the main insulation capacitance of the tested cable, < >>For a first alternating phase voltage between the core of the tested cable and the metallic protection layer +. >For a first alternating phase current between the core of the tested cable and the metallic protective layer,Rfor the main insulation resistance of the tested cable,fa frequency for the first ac excitation voltage;
the control module determines whether the tested cable passes through the cable test item according to the measurement result of the tested cable, and comprises the following steps:
and if the main insulation capacitance of the tested cable is larger than or equal to the main insulation capacitance threshold value, the control module confirms that the tested cable passes the main insulation capacitance test.
4. A cable testing method according to claim 3, wherein the cable test item further comprises: testing the main insulation alternating current withstand voltage;
the excitation voltage comprises a second alternating current excitation voltage, and the second alternating current excitation voltage comprises a plurality of alternating current voltages which are sequentially applied between the wire core of the tested cable and the metal protective layer from small to large;
the measurement result comprises a plurality of groups of second alternating-current phase voltages and second alternating-current phase currents which are changed from small to large between the wire core of the tested cable and the metal protective layer in sequence, and the plurality of groups of second alternating-current phase voltages and second alternating-current phase currents are used for determining a plurality of main insulation impedances of the tested cable;
The control module determines whether the tested cable passes through the cable test item according to the measurement result of the tested cable, and comprises the following steps:
and if the deviation among the plurality of main insulation impedances is smaller than or equal to a main insulation impedance deviation threshold value, the control module confirms that the tested cable passes the main insulation alternating current withstand voltage test.
5. The cable testing method of claim 2, wherein the cable test item further comprises: the direct current withstand voltage test of the outer sheath;
the excitation voltage comprises a second direct current excitation voltage which is applied between the metal protection layer and the grounding end of the tested cable;
the measurement result comprises a third direct current phase voltage and a third direct current phase current between the metal protection layer and the grounding end of the tested cable;
the insulation resistance of the second outer sheath of the tested cable is the ratio of the third direct current phase voltage to the third direct current phase current between the metal protection layer and the grounding end of the tested cable;
the control module determines whether the tested cable passes through the cable test item according to the measurement result of the tested cable, and comprises the following steps:
and if the insulation resistance of the second outer sheath of the tested cable is greater than or equal to the insulation resistance threshold of the outer sheath, the control module confirms that the tested cable passes the direct-current voltage withstand test of the outer sheath.
6. The cable testing method of claim 2, wherein the cable test item comprises a cable both-end phase check of the cable under test;
the excitation voltages comprise three groups of third direct current excitation voltages, the three groups of third direct current excitation voltages are sequentially applied between a three-phase wire core and a grounding end of the tested cable, each group of third direct current excitation voltages comprises a non-zero single-phase direct current excitation voltage and two zero-value single-phase direct current excitation voltages, the values of the non-zero single-phase direct current excitation voltages in the three groups of third direct current excitation voltages are different, and the three excitation voltages in each group of third direct current excitation voltages are respectively applied between the three-phase wire core and the grounding end of the tested cable;
the measurement result comprises three groups of fourth direct current phase voltages between the three-phase wire cores of the tested cable and the grounding end, and each group of fourth direct current phase voltages is used for determining the phase of the other end of the tested cable;
the control module determines whether the tested cable passes through the cable test item according to the measurement result of the tested cable, and comprises the following steps:
and if the phases of the three-phase wire cores at the other end of the tested cable are respectively consistent with the phases of the three-phase wire cores at the local end of the tested cable, the control module confirms that the three-phase cable passes through the phase inspection at the two ends of the cable.
7. The cable testing method of any one of claims 1-6, further comprising:
the control module receives the cable test item and the stimulus voltage.
8. A cable testing device, comprising: the device comprises a control module, a carrier phase-shifting pulse width modulation generator, a multi-unit series inverter and a measuring module; wherein,
the control module is used for sending excitation voltage generation parameters to the carrier phase-shifting pulse width modulation generator according to the cable test item and the excitation voltage;
the carrier phase-shifting pulse width modulation generator is used for generating a pulse width modulation signal according to the excitation voltage generation parameter and sending the parameter generation pulse width modulation signal to the multi-unit series inverter;
the multi-unit serial inverter is used for generating excitation voltage according to the pulse width modulation signal, wherein the excitation voltage is applied to a cable to be tested and used for completing the cable test project;
the control module is also used for receiving the measurement result of the cable to be measured from the measurement module;
and the control module is also used for determining whether the tested cable passes through the cable test item according to the measurement result of the tested cable.
9. The cable testing device of claim 8, wherein the cable test items include a main insulation resistance test and an outer jacket insulation resistance test;
the excitation voltage comprises a first direct current excitation voltage which is applied between the wire core of the tested cable and the metal protection layer, and between the metal protection layer of the tested cable and the grounding end;
the measurement result comprises a first direct-current phase voltage and a first direct-current phase current between the wire core of the tested cable and the metal protection layer, or a second direct-current phase voltage and a second direct-current phase current between the metal protection layer of the tested cable and the grounding end;
the main insulation resistance of the tested cable is the ratio of a first direct current phase voltage to a first direct current phase current between a wire core of the tested cable and a metal protective layer;
the insulation resistance of the first outer sheath of the tested cable is the ratio of the second direct-current phase voltage to the second direct-current phase current between the metal protection layer and the grounding end of the tested cable;
the control module is further configured to confirm that the tested cable passes the main insulation resistance test if the main insulation resistance of the tested cable is greater than or equal to a main insulation resistance threshold;
And the control module is further used for confirming that the tested cable passes the outer sheath insulation resistance test if the first outer sheath insulation resistance of the tested cable is larger than or equal to the outer sheath insulation resistance threshold value.
10. The cable testing device of claim 9, wherein the cable test item further comprises a primary insulation capacitance test;
the excitation voltage comprises a first alternating current excitation voltage which is applied between the wire core of the tested cable and the metal protection layer;
the measurement result comprises a first alternating-current phase voltage and a first alternating-current phase current between the wire core of the tested cable and the metal protection layer;
the main insulation capacitance of the tested cable meets the following conditions:，Cfor the main insulation capacitance of the tested cable, < >>For a first alternating phase voltage between the core of the tested cable and the metallic protection layer +.>For a first alternating phase current between the core of the tested cable and the metallic protective layer,Rfor the main insulation resistance of the tested cable,fis saidThe frequency of the first ac excitation voltage;
and the control module is further used for confirming that the tested cable passes the main insulation capacitance test if the main insulation capacitance of the tested cable is greater than or equal to the main insulation capacitance threshold value.
11. The cable testing device of claim 10, wherein the cable test item further comprises: testing the main insulation alternating current withstand voltage;
the excitation voltage comprises a second alternating current excitation voltage, and the second alternating current excitation voltage comprises a plurality of alternating current voltages which are sequentially applied between the wire core of the tested cable and the metal protective layer from small to large;
the measurement result comprises a plurality of groups of second alternating-current phase voltages and second alternating-current phase currents which are changed from small to large between the wire core of the tested cable and the metal protective layer in sequence, and the plurality of groups of second alternating-current phase voltages and second alternating-current phase currents are used for determining a plurality of main insulation impedances of the tested cable;
and the control module is further used for confirming that the tested cable passes the main insulation alternating current withstand voltage test if the deviation among the plurality of main insulation impedances is smaller than or equal to a main insulation impedance deviation threshold value.
12. The cable testing device of claim 9, wherein the cable test item further comprises: the direct current withstand voltage test of the outer sheath;
the excitation voltage comprises a second direct current excitation voltage which is applied between the metal protection layer and the grounding end of the tested cable;
The measurement result comprises a third direct current phase voltage and a third direct current phase current between the metal protection layer and the grounding end of the tested cable;
the insulation resistance of the second outer sheath of the tested cable is the ratio of the third direct current phase voltage to the third direct current phase current between the metal protection layer and the grounding end of the tested cable;
and the control module is also used for confirming that the tested cable passes the outer sheath direct current withstand voltage test if the insulation resistance of the second outer sheath of the tested cable is larger than or equal to the insulation resistance threshold value of the outer sheath.
13. The cable testing device of claim 8, wherein the cable test item comprises a cable both-end phase check of the cable under test;
the excitation voltages comprise three groups of third direct current excitation voltages, the three groups of third direct current excitation voltages are sequentially applied between a three-phase wire core and a grounding end of the tested cable, each group of third direct current excitation voltages comprises a non-zero single-phase direct current excitation voltage and two zero-value single-phase direct current excitation voltages, the values of the non-zero single-phase direct current excitation voltages in the three groups of third direct current excitation voltages are different, and the three excitation voltages in each group of third direct current excitation voltages are respectively applied between the three-phase wire core and the grounding end of the tested cable;
The measurement result comprises three groups of fourth direct current phase voltages between the three-phase wire cores of the tested cable and the grounding end, and each group of fourth direct current phase voltages is used for determining the phase of the other end of the tested cable;
and the control module is also used for confirming that the three-phase cable passes through the phase inspection at the two ends of the cable if the phases of the three-phase wire cores at the other end of the tested cable are respectively consistent with the phases of the three-phase wire cores at the local end of the tested cable.
14. The cable testing device of any one of claims 8-13, wherein,
the control module is also configured to receive the cable test item and the stimulus voltage.
15. An electronic device, comprising: a processor coupled to the memory;
wherein the processor is configured to read and execute the program or instructions stored in the memory, so that the electronic device performs the cable testing method according to any one of claims 1-7.
16. A computer-readable storage medium, characterized in that a program or instructions is stored, which, when read and executed by a computer, cause the computer to perform the cable test method according to any one of claims 1-7.
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