CN113267706A - Cable fault detection device and system - Google Patents
Cable fault detection device and system Download PDFInfo
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- CN113267706A CN113267706A CN202110462852.2A CN202110462852A CN113267706A CN 113267706 A CN113267706 A CN 113267706A CN 202110462852 A CN202110462852 A CN 202110462852A CN 113267706 A CN113267706 A CN 113267706A
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The application relates to a cable fault detection device and system. The device includes: a control module and a test module; the test module is used for boosting or reducing the voltage provided by the external input power supply according to the control command sent by the control module; applying the boosted or reduced voltage to the cable to be tested, and collecting working parameters of the cable to be tested; the working parameters comprise at least two of working voltage, test current and partial discharge signals; the control module is used for receiving the working parameters transmitted by the test module and determining the fault detection result of the cable to be detected according to the working parameters; the fault detection result comprises at least two of a withstand voltage test result, a dielectric loss test result and a partial discharge test result. This device is highly integrated, can realize carrying out withstand voltage test, mesoscopic loss test and partial discharge test to the cable that awaits measuring in a device, and the test procedure is simple, and the security is higher, and simultaneously, cable fault detection device's volume is littleer.
Description
Technical Field
The application relates to the technical field of power systems, in particular to a cable fault detection device and system.
Background
As power cables are frequently used in power distribution systems, faults of the power cables due to various reasons are gradually increased, and therefore, it is important to detect faults of the power cables.
At present, tests for fault detection of power cables mainly include a direct-current withstand voltage test, an alternating-current withstand voltage test, a dielectric loss test, a partial discharge test and the like. For testing of different fault detections, different detection devices are typically used to test the power cable.
However, the conventional fault detection device for the power cable has the problems of low integration level and complicated test.
Disclosure of Invention
In view of the above, it is necessary to provide a cable fault detection apparatus and system capable of high integration and simple testing.
In a first aspect, the present application provides a cable fault detection apparatus, the apparatus comprising: a control module and a test module;
the test module is used for boosting or reducing the voltage provided by the external input power supply according to the control command sent by the control module; applying the boosted or reduced voltage to the cable to be tested, and collecting working parameters of the cable to be tested; the working parameters comprise at least two of working voltage, test current and partial discharge signals;
the control module is used for receiving the working parameters transmitted by the test module and determining the fault detection result of the cable to be detected according to the working parameters; the fault detection result comprises at least two of a withstand voltage test result, a dielectric loss test result and a partial discharge test result.
In one embodiment, the test module comprises: the device comprises a high voltage generator, a dielectric loss testing module and a partial discharge testing module; the output end of the control module is connected with the input end of the high-voltage generator; two output ends of the high-voltage generator are respectively connected with two ends of the cable to be tested; the dielectric loss test module is respectively connected with the output end of the high-voltage generator and the input end of the control module; the partial discharge test module is connected between the high-voltage generator and the cable to be tested and is also connected with the input end of the control module;
the high-voltage generator is used for boosting or reducing the voltage provided by the external input power supply and applying the boosted or reduced voltage to the cable to be tested;
the dielectric loss testing module is used for collecting the testing voltage and the testing current of the cable to be tested and transmitting the testing voltage and the testing current to the control module;
and the partial discharge test module is used for collecting partial discharge signals of the cable to be tested and transmitting the partial discharge signals to the control module.
In one embodiment, the dielectric loss testing module comprises: the system comprises a sampling module and a dielectric loss signal acquisition unit; the sampling module is respectively connected with the first output end of the high-voltage generator, the second output end of the high-voltage generator and the first input end of the dielectric loss signal acquisition unit; the second input end of the dielectric loss acquisition unit is connected with the first output end of the high-voltage generator; the output end of the dielectric loss signal acquisition unit is connected with the input end of the control module;
and the dielectric loss signal acquisition unit is used for acquiring the test voltage and the test current on the sampling module as the test voltage of the cable to be tested and the test current of the cable to be tested.
In one embodiment, the sampling module comprises: a first resistor, a second resistor and a third resistor; one end of the first resistor is connected with one end of the second resistor, the other end of the first resistor is connected with the first output end of the high-voltage generator, and the other end of the second resistor is connected with the second output end of the high-voltage generator; one end of the third resistor is connected with the first output end of the high-voltage generator, and the other end of the third resistor is connected with one end of the cable to be tested; the second end of the high-voltage generator is grounded;
and the dielectric loss signal acquisition unit is used for acquiring the voltage of the second resistor and the current of the third resistor as the test voltage of the cable to be tested and the test current of the cable to be tested.
In one embodiment, the resistance value of the first resistor is greater than that of the second resistor, and the difference value between the resistance value of the first resistor and the second resistor is greater than a preset resistance value threshold;
the control module is also used for determining the test voltage of the cable to be tested according to the voltage of the second resistor, the resistance value of the first resistor and the resistance value of the second resistor;
and the control module is used for determining the dielectric loss value of the cable to be tested according to the test voltage of the cable to be tested and the test current of the cable to be tested.
In one embodiment, the apparatus further comprises an analog-to-digital converter; the input end of the analog-to-digital converter is connected with the output end of the partial discharge testing module; the output end of the analog-to-digital converter is connected with the input end of the control module;
and the analog-to-digital converter is used for performing analog-to-digital conversion on the partial discharge signal to generate a digital partial discharge signal and transmitting the digital partial discharge signal to the control module.
In one embodiment, the apparatus further comprises: a wireless communication module; the input end of the wireless communication module is respectively connected with the output end of the control module and the output end of the analog-to-digital converter;
and the wireless communication module is used for sending the working parameters, the fault detection results or the digital partial discharge signals generated by the analog-to-digital converter, which are acquired by the control module, to the terminal.
In one embodiment, the control module is further configured to receive a voltage boosting command or a voltage reducing command sent by the terminal, and generate the control command according to the voltage boosting command or the voltage reducing command.
In one embodiment, the cable fault detection apparatus further comprises a power module;
and the power supply module is used for supplying power to the control module.
In a second aspect, the present application provides a cable fault detection system, the system comprising: a terminal and a cable fault detection device as in any embodiment of the first aspect above;
and the terminal is used for sending a voltage boosting command or a voltage reducing command to the cable fault detection device, receiving the working parameters and the fault detection result of the cable to be detected sent by the cable fault detection device and displaying the working parameters and the fault detection result.
Above-mentioned cable fault detection device and system, because the device includes: a control module and a test module; the test module boosts or reduces the voltage provided by an external input power supply according to the control instruction sent by the control module; applying the boosted or reduced voltage to the cable to be tested, and collecting working parameters of the cable to be tested; the control module receives the working parameters transmitted by the test module and determines the fault detection result of the cable to be detected according to the working parameters; the device can perform a voltage withstand test, a dielectric loss test and a partial discharge test on the cable to be tested in one device, obtain working parameters of the cable to be tested during different tests, including at least two of working voltage, test current and partial discharge signals, and determine fault detection results corresponding to different tests according to the working parameters; the fault detection result comprises at least two of a withstand voltage test result, a dielectric loss test result and a partial discharge test result, a test device corresponding to each experiment does not need to be replaced, and the test process is simplified.
Drawings
FIG. 1 is a block diagram of a cable fault detection apparatus according to an embodiment;
FIG. 2 is a block diagram showing the construction of a cable fault detection apparatus according to another embodiment;
FIG. 3 is a block diagram showing the construction of a cable fault detection apparatus according to another embodiment;
FIG. 4 is a block diagram showing the construction of a cable fault detection apparatus according to another embodiment;
FIG. 5 is a block diagram showing the construction of a cable fault detection apparatus according to another embodiment;
FIG. 6 is a block diagram showing the construction of a cable fault detection apparatus according to another embodiment;
FIG. 7 is a block diagram showing the construction of a cable fault detection apparatus according to another embodiment;
FIG. 8 is a block diagram of a cable fault detection system in one embodiment;
fig. 9 is a block diagram of a terminal in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The numbering of the components as such, for example "first", "second", etc., in this application is used solely to distinguish between the objects depicted and not to imply any order or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In one embodiment, fig. 1 is a block diagram of a cable fault detection apparatus, and as shown in fig. 1, a cable fault detection apparatus is provided, which includes a control module 11 and a test module 12;
the test module 12 is configured to boost or reduce a voltage provided by an external input power according to the control instruction sent by the control module 11; applying the boosted or reduced voltage to the cable 13 to be tested, and collecting working parameters of the cable 13 to be tested; the working parameters comprise at least two of working voltage, test current and partial discharge signals;
the control module 11 is used for receiving the working parameters transmitted by the test module 12 and determining the fault detection result of the cable to be detected according to the working parameters; the fault detection result comprises at least two of a withstand voltage test result, a dielectric loss test result and a partial discharge test result.
The control module processor may be implemented by a Micro Control Unit (MCU) chip, a dsp (digital Signal processing) chip, or a Field Programmable Gate Array (FPGA) chip, which is not limited in the embodiment of the present application. The working voltage and the test current refer to the voltage and the current on the cable to be tested, wherein the voltage provided by the external input power supply is boosted or reduced by the test module according to the control command sent by the control module and is transmitted to the cable to be tested. The test voltage is the equivalent working voltage of the cable to be tested on the test module; the partial discharge signal refers to a high-frequency current existing in the test current of the cable to be tested when the test module boosts or reduces the voltage provided by the external input power supply according to the control command sent by the control module. The external input power supply provides an alternating current power supply with the voltage of 220V.
Specifically, the cable to be tested is connected with a test module in the cable fault detection device, the control module can send a control instruction to the test module, the test module is instructed to boost or reduce the voltage provided by the accessed external input power supply, the boosted or reduced voltage is applied to the cable to be tested, and at the moment, the test module collects the working voltage, the test current, the partial discharge signal and the test voltage of the cable to be tested in real time. The method comprises the steps that firstly, a dielectric loss test can be carried out on a cable to be tested, the control module can send a control command to the test module, and the voltage provided by the accessed external input power supply is boosted or reduced to the rated voltage U of the cable to be tested00.5 times U of0Hour, 1.0 times of U0Hour, 1.5 times of U0Then, the cables to be measured are respectively collected at 0.5 times U0Hour, 1.0 times U0Hour, 1.5 times of U0Test voltage and test current of time, and collected test currentThe voltage and the test current are transmitted to the control module, the control module can calculate whether the cable to be tested has medium loss according to the test voltage and the test current and a dielectric loss value calculation formula, namely a dielectric loss angle calculation formula, and when the medium loss exists, the cable to be tested is shown to be 0.5U0Voltage of 1.0U0Voltage of 1.5U0When the voltage is not higher than the preset threshold value, firstly, the dielectric loss value is not more than the preset threshold value, and secondly, the cable to be tested is at 0.5U0Voltage of 1.0U0Voltage of 1.5U0The corresponding dielectric loss value is correspondingly increased when the voltage is higher than the reference voltage, namely the dielectric loss test result is abnormal. After the dielectric loss test result is obtained, the control module can send a control instruction to the test module, and the voltage provided by the external input power supply connected to the test module is boosted to the rated voltage U of the cable to be tested03 times of U0During the test, the cable to be tested is continuously pressurized within a preset time period, a voltage withstand test is carried out, whether the working voltage on the cable to be tested is abnormal or not is tested within the preset time period, for example, within the preset time period, the cable to be tested is 3 times U0When the voltage works, the test module collects the working voltage of the cable to be tested in real time and transmits the working voltage to the control module, and the control module can obtain the voltage withstanding test result of the cable to be tested according to the working voltage. Exemplarily, if the cable to be tested is 3 times U0When the voltage works, the short circuit phenomenon occurs to the cable to be tested in a preset time period, at the moment, the working voltage of the cable to be tested is 0, namely, the withstand voltage test result of the cable to be tested is abnormal. In the process of carrying out dielectric loss test and voltage withstand test, the test module can collect test current of a cable to be tested in real time, carry out partial discharge test, detect whether partial discharge signals are collected or not, and transmit the test current and the collected partial discharge signals to the control module if the partial discharge signals are collected; the control module determines whether the partial discharge phenomenon occurs in the cable to be tested according to whether the partial discharge signal is received. If the test module acquires that high-frequency current exists in the test current of the cable to be tested and transmits a high-frequency current signal to the control module, the control module can determine that the cable to be tested has a partial discharge phenomenon, namely, the partial discharge test result is abnormal.
In the embodiment, the cable fault detection device comprises a control module and a test module; the test module boosts or reduces the voltage provided by an external input power supply according to the control instruction sent by the control module; applying the boosted or reduced voltage to the cable to be tested, and collecting working parameters of the cable to be tested; and the control module receives the working parameters transmitted by the test module and determines the fault detection result of the cable to be detected according to the working parameters. The device can perform a voltage withstand test, a dielectric loss test and a partial discharge test on the cable to be tested in one device, obtain working parameters of the cable to be tested during different tests, including at least two of working voltage, test current and partial discharge signals, and determine fault detection results corresponding to different tests according to the working parameters; the fault detection result comprises at least two of a withstand voltage test result, a dielectric loss test result and a partial discharge test result, a test device corresponding to each experiment does not need to be replaced, and the test process is simplified.
The above embodiments have been described for the cable fault detection apparatus, and now the test module of the cable fault detection apparatus is further described with an embodiment, as shown in fig. 2, the test module 12 includes: a high voltage generator 121, a dielectric loss test module 122 and a local discharge test module 123; the output end of the control module 11 is connected with the input end of the high voltage generator 121; two output ends of the high-voltage generator 121 are respectively connected with two ends of the cable 13 to be tested; the dielectric loss testing module 122 is respectively connected with the output end of the high voltage generator 121 and the input end of the control module 11; the partial discharge test module 123 is connected between the high voltage generator 121 and the cable 13 to be tested, and the partial discharge test module 123 is further connected with the input end of the control module 11;
a high voltage generator 121 for boosting or stepping down a voltage provided from an external input power source and applying the boosted or stepped-down voltage to the cable 13 to be tested;
the dielectric loss test module 122 is configured to collect a test voltage and a test current of the cable 13 to be tested, and transmit the test voltage and the test current to the control module 11;
the partial discharge test module 123 is configured to collect a partial discharge signal of the cable 13 to be tested, and transmit the partial discharge signal to the control module 11.
The cable to be tested consists of a core wire and a protective layer, one output end of the high-voltage generator is connected with the core wire of the cable to be tested, and the other output end of the high-voltage generator is connected with the protective layer of the cable to be tested and grounded. The grounded end of the high-voltage generator is a low-voltage end, and the ungrounded end of the high-voltage generator is a high-voltage end.
Specifically, the input end of the high-voltage generator is connected with the external input power supply, the voltage provided by the external input power supply is boosted or reduced according to the control instruction of the control module, and the boosted or reduced voltage is applied to the cable to be tested so as to meet the voltage requirements of the cable to be tested for different test tests. The dielectric loss test module is respectively connected with the output end of the high-voltage generator and the input end of the control module, when a cable to be tested receives test voltage for dielectric loss test, the dielectric loss test module is connected with the cable to be tested in parallel, and the voltage of the dielectric loss test module is equal to the voltage of the cable to be tested. The partial discharge test module is connected between the high-voltage generator and the cable to be tested and is also connected with the input end of the control module; because the partial discharge test module is connected with the cable to be tested in series, the current is equal, if the current of the cable to be tested has high-frequency current, the high-frequency current, namely the partial discharge signal, can be collected through the partial discharge test module, so the partial discharge test module can collect the partial discharge signal in the test current of the cable to be tested, and transmit the partial discharge signal to the control module. The dielectric loss testing module may include a sampling module or a capacitive voltage divider, which is not limited herein. The partial discharge test module may include a high-frequency current transformer, a high-frequency current detection circuit, and the like.
Alternatively, the high voltage generator may be a 0.1Hz sine wave ultra low frequency high voltage generator.
In this embodiment, the test module includes: the device comprises a high voltage generator, a dielectric loss testing module and a partial discharge testing module; the output end of the control module is connected with the input end of the high-voltage generator; two output ends of the high-voltage generator are respectively connected with two ends of the cable to be tested; the dielectric loss test module is respectively connected with the output end of the high-voltage generator and the input end of the control module; the partial discharge test module is connected between the high-voltage generator and the cable to be tested and is also connected with the input end of the control module; the high-voltage generator boosts or reduces the voltage provided by an external input power supply and applies the boosted or reduced voltage to the cable to be tested; the dielectric loss testing module collects the testing voltage and the testing current of the cable to be tested and transmits the testing voltage and the testing current to the control module; the partial discharge test module collects partial discharge signals of the cable to be tested and transmits the partial discharge signals to the control module. Because the high voltage generator chooses the ultralow frequency high voltage generator of the ultralow frequency 0.1Hz sine wave of the ultralow frequency for use, has greatly reduced the required power of testing arrangement, and then has reduced the volume of testing arrangement, and can pass through test module, carry out withstand voltage test, dielectric loss test and partial discharge test, need not to change testing arrangement, and the test procedure is simple, and the integrated level is high.
In the above description, the test module is described in the embodiments, and now, an embodiment is further described for a dielectric loss test module in the test module, in an embodiment, as shown in fig. 3, the dielectric loss test module 122 includes: a sampling module 1221 and a dielectric loss signal acquisition unit 1222; the sampling module 1221 is respectively connected to the first output terminal of the high voltage generator 121, the second output terminal of the high voltage generator 121, and the first input terminal of the dielectric loss signal acquisition unit 1222; the second input end of the dielectric loss acquisition unit 1222 is connected with the first output end of the high voltage generator 121; the output end of the dielectric loss signal acquisition unit 1222 is connected with the input end of the control module 11;
the dielectric loss signal acquisition unit 1222 is configured to acquire the test voltage and the test current of the sampling module 1221, as the test voltage of the cable to be tested and the test current of the cable to be tested.
Specifically, because the cable that awaits measuring when carrying out the fault detection test, the voltage on the cable that awaits measuring is all very big, all is the voltage of tens of thousands of volts usually, so unable direct test reachs the voltage of the cable that awaits measuring, at this moment, can realize the equivalence to the cable that awaits measuring voltage, current through the sampling module, promptly, the current on the resistance of establishing ties with the cable that awaits measuring in the sampling module equals with the current of the cable that awaits measuring, and the voltage on the resistance parallelly connected with the cable that awaits measuring in the sampling module equals with the voltage of the cable that awaits measuring. And then, the dielectric loss signal acquisition unit can acquire the test voltage and the test current on the sampling module as the test voltage of the cable to be tested and the test current of the cable to be tested. The dielectric loss signal acquisition unit may include, without limitation, a voltage transformer, a current transformer, and the like.
In this embodiment, the dielectric loss test module includes: the system comprises a sampling module and a dielectric loss signal acquisition unit; the sampling module is respectively connected with the first output end of the high-voltage generator, the second output end of the high-voltage generator and the first input end of the dielectric loss signal acquisition unit; the second input end of the dielectric loss acquisition unit is connected with the first output end of the high-voltage generator; the output end of the dielectric loss signal acquisition unit is connected with the input end of the control module; the dielectric loss signal acquisition unit acquires test voltage and test current on the sampling module as test voltage of the cable to be tested and test current of the cable to be tested. The acquisition of test voltage and test current of the cable to be tested can be realized.
The foregoing embodiments have described the dielectric loss testing module, wherein the sampling module can achieve the equivalent of the working voltage and the test current on the cable to be tested, and the sampling module is further described with an embodiment, in which, as shown in fig. 4, the sampling module 1221 includes: a first resistor 41, a second resistor 42, and a third resistor 43; one end of the first resistor 41 is connected to one end of the second resistor 42, the other end of the first resistor 41 is connected to the first output end of the high voltage generator 121, and the other end of the second resistor 42 is connected to the second output end of the high voltage generator 121; one end of the third resistor 43 is connected with the first output end of the high voltage generator 121, and the other end of the third resistor 43 is connected with one end of the cable 13 to be tested; a second end of the high voltage generator 121 is grounded;
and the dielectric loss signal acquisition unit is used for acquiring the voltage of the second resistor and the current of the third resistor as the test voltage of the cable to be tested and the test current of the cable to be tested.
Specifically, the third resistor is connected in series with the cable to be tested, and then the currents on the cable to be tested and the third resistor are equal, so that the test current of the current to be tested can be known by acquiring the current of the third resistor through the dielectric loss signal acquisition unit. Meanwhile, the voltage of the first resistor and the second resistor is equal to the working voltage of the cable to be tested; the resistance value of the first resistor is set to be larger than that of the second resistor, and the difference value between the resistance value of the first resistor and the second resistor is larger than a preset resistance value threshold value; the resistance of the first resistor is far greater than that of the second resistor, the voltage on the first resistor can be equivalent to the voltage of the cable to be tested, because the voltage of the cable to be tested is very large in the test process and cannot be tested, the voltage on the second resistor of the small resistor can be collected through the dielectric loss signal collection unit, the voltage of the first resistor of the large resistor is calculated according to the proportional relation between the first resistor and the second resistor, namely, the control module can determine the test voltage of the cable to be tested according to the voltage of the second resistor, the resistance of the first resistor and the resistance of the second resistor. After the control module determines the test voltage of the cable to be tested, the dielectric loss value of the cable to be tested can be determined through a dielectric loss angle calculation formula according to the test voltage of the cable to be tested and the test current of the cable to be tested.
Optionally, the resistor divider may include: a first resistor and a second resistor.
In this embodiment, since the sampling module includes: a first resistor, a second resistor and a third resistor; one end of the first resistor is connected with one end of the second resistor, the other end of the first resistor is connected with the first output end of the high-voltage generator, and the other end of the second resistor is connected with the second output end of the high-voltage generator; one end of the third resistor is connected with the first output end of the high-voltage generator, and the other end of the third resistor is connected with one end of the cable to be tested; the dielectric loss signal acquisition unit acquires the voltage of the second resistor and the current of the third resistor as the test voltage of the cable to be tested and the test current of the cable to be tested. Can realize the equivalence to the cable that awaits measuring through the resistance in the sampling module, and then obtain the fault detection result of the cable that awaits measuring, it is simple effective, and with low costs.
The cable fault detection device in the above embodiment is described, when the cable fault detection module acquires working parameters such as working voltage of the cable to be detected, the working parameters are analog signals, and the analog signals can be converted by the analog-to-digital converter, so as to implement information interaction between data and external equipment, an embodiment of the analog-to-digital converter is described, in an embodiment, as shown in fig. 5, the cable fault detection device further includes an analog-to-digital converter 14; the input end of the analog-to-digital converter 14 is connected with the output end of the partial discharge test module; the output end of the analog-to-digital converter 14 is connected with the input end of the control module 11;
the analog-to-digital converter 14 is configured to perform analog-to-digital conversion on the partial discharge signal to generate a digital partial discharge signal, and transmit the digital partial discharge signal to the control module 11.
Specifically, in the control module, the control module has an analog-to-digital conversion function, and can perform analog-to-digital conversion on three analog signals, namely test voltage, working voltage and test current, which have low sampling rate requirements, and the partial discharge signal is a high-frequency current signal, so that the analog-to-digital converter with a high sampling rate can be arranged to perform analog-to-digital conversion on the partial discharge signal, generate a digital partial discharge signal, and transmit the digital partial discharge signal to the control module.
In this embodiment, the cable fault detection apparatus further includes an analog-to-digital converter; the input end of the analog-to-digital converter is connected with the output end of the partial discharge testing module; the output end of the analog-to-digital converter is connected with the input end of the control module; the analog-to-digital converter performs analog-to-digital conversion on the partial discharge signal to generate a digital partial discharge signal, and transmits the digital partial discharge signal to the control module. The interaction between the working parameters of the cable fault detection and the external equipment can be realized, and then the experimental process of the remote monitoring cable fault detection is realized.
The foregoing embodiment describes a digital-to-analog converter in a cable fault detection apparatus, and after a working parameter of each cable to be detected is generated into a digital signal, information interaction between the cable to be detected and an external device may be implemented through a wireless communication module, where an embodiment describes the wireless communication module, and in an embodiment, as shown in fig. 6, the cable fault detection apparatus further includes: a wireless communication module 15; the input end of the wireless communication module 15 is respectively connected with the output end of the control module 11 and the output end of the analog-to-digital converter 14;
and the wireless communication module 15 is configured to send the working parameters, the fault detection result, or the digital partial discharge signal generated by the analog-to-digital converter 14, acquired by the control module 11 to the terminal 61.
Specifically, when the test module sends working parameters of the cable to be tested, including working voltage, test current, test voltage and partial discharge signals, to the control module, the control module performs analog-to-digital conversion to generate digital signals corresponding to the working parameters and generate fault detection results, and then the working parameters and the fault detection results are sent to the terminal through the wireless communication module; the test module can also send the working parameters of the cable to be tested, including working voltage, test current and test voltage, to the control module, the control module performs analog-to-digital conversion to generate digital signals corresponding to the working parameters and generate fault detection results, and meanwhile, after the partial discharge signals can be subjected to analog-to-digital conversion independently through the analog-to-digital converter, the digital signals corresponding to the partial discharge signals subjected to analog-to-digital conversion are directly sent to the terminal through the wireless communication module. The terminal can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, portable wearable devices and the like.
Optionally, the control module is further configured to receive a voltage boosting instruction or a voltage reducing instruction sent by the terminal, and generate the control instruction according to the voltage boosting instruction or the voltage reducing instruction.
In this embodiment, the cable fault detection apparatus further includes: a wireless communication module; the input end of the wireless communication module is respectively connected with the output end of the control module and the output end of the analog-to-digital converter; and the wireless communication module sends the working parameters, the fault detection result or the digital partial discharge signal generated by the analog-to-digital converter acquired by the control module to the terminal. The information communication between the terminal and the cable fault detection device can be realized, and then the fault detection result and the working parameters of the cable to be detected can be remotely detected, so that the safety is improved.
In one embodiment, as shown in fig. 7, the cable fault detection apparatus further includes a power module 16;
and the power supply module 16 is used for supplying power to the control module 11.
Specifically, the power module is used for supplying power to the control module so as to send a control instruction to the test module. The power module may include a battery, a power interface connected to an input power source, and the like, which are not limited herein.
In this embodiment, the cable fault detection apparatus further includes a power supply module; the power module supplies power to the control module. The normal operation of the cable fault detection device can be ensured, and the detection of the cable fault is realized.
The foregoing embodiment describes a cable fault detection device, and after the cable fault detection device detects a cable, the cable fault detection device may further send a fault detection result and a working parameter of the cable to be detected to a terminal for displaying, where the cable fault detection device and the terminal form a cable fault detection system, and the cable fault detection system is further described with reference to an embodiment, where in an embodiment, as shown in fig. 8, the cable fault detection system includes: a terminal 81 and a cable fault detection device 82 in any of the embodiments described above;
and the terminal 81 is used for sending a voltage boosting command or a voltage reducing command to the cable fault detection device 82, receiving the working parameters and the fault detection result of the cable to be detected 83 sent by the cable fault detection device, and displaying the working parameters and the fault detection result.
The terminal can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, portable wearable devices and the like. Alternatively, the terminal may be a handheld controller, and an internal structure diagram of the handheld controller may be as shown in fig. 9, and include: display 91, wireless communication module 92, processor 93, battery 94, keyboard 95. The wireless communication module of the handheld controller is used for carrying out wireless communication with the cable fault detection device, and the wireless mode can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The processor may be, but not limited to, a Micro Controller Unit (MCU) chip, a dsp (digital Signal processing) chip, and a Field Programmable Gate Array (FPGA) chip, and is configured to send a voltage boosting instruction or a voltage reducing instruction to the cable fault detection device, and receive a working parameter and a fault detection result of the cable to be detected, which are sent by the cable fault detection device. The keyboard is used for a user to edit a boosting instruction or a reducing instruction. The display is used for displaying working parameters and fault detection results of the cable to be detected, which are sent by the cable fault detection device. And the battery is used for supplying power to the display, the wireless communication module, the processor and the keyboard.
In this embodiment, the cable fault detection system includes: a terminal and a cable fault detection device as in any one of the above embodiments; the terminal sends a voltage boosting command or a voltage reducing command to the cable fault detection device, receives working parameters and fault detection results of the cable to be detected sent by the cable fault detection device and displays the working parameters and the fault detection results. Can realize long-range cable to be measured carry out withstand voltage test, the experimental real time monitoring of loss test, local side, with control, realize with an integrated testing arrangement, detect the trouble of cable to be measured, cable fault detection device's integrated level is high in this system, and the test process is simple and all in the high-pressure side, has promoted the security of test, and cable fault detection device's is small in this system, and the transportation of being convenient for is carried.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A cable fault detection apparatus, characterized in that the apparatus comprises: a control module and a test module;
the test module is used for boosting or reducing the voltage provided by the external input power supply according to the control instruction sent by the control module; applying the boosted or reduced voltage to the cable to be tested, and collecting working parameters of the cable to be tested; the working parameters comprise at least two of working voltage, test current and partial discharge signals;
the control module is used for receiving the working parameters transmitted by the test module and determining a fault detection result of the cable to be detected according to the working parameters; the fault detection result comprises at least two of a withstand voltage test result, a dielectric loss test result and a partial discharge test result.
2. The apparatus of claim 1, wherein the test module comprises: the device comprises a high voltage generator, a dielectric loss testing module and a partial discharge testing module; the output end of the control module is connected with the input end of the high-voltage generator; two output ends of the high-voltage generator are respectively connected with two ends of the cable to be tested; the dielectric loss test module is respectively connected with the output end of the high-voltage generator and the input end of the control module; the partial discharge test module is connected between the high-voltage generator and the cable to be tested, and is also connected with the input end of the control module;
the high-voltage generator is used for boosting or reducing the voltage provided by the external input power supply and applying the boosted or reduced voltage to the cable to be tested;
the dielectric loss testing module is used for collecting the testing voltage and the testing current of the cable to be tested and transmitting the testing voltage and the testing current to the control module;
the partial discharge testing module is used for collecting the partial discharge signals of the cable to be tested and transmitting the partial discharge signals to the control module.
3. The apparatus of claim 2, wherein the dielectric loss testing module comprises: the system comprises a sampling module and a dielectric loss signal acquisition unit; the sampling module is respectively connected with a first output end of the high-voltage generator, a second output end of the high-voltage generator and a first input end of the dielectric loss signal acquisition unit; the second input end of the dielectric loss acquisition unit is connected with the first output end of the high-voltage generator; the output end of the dielectric loss signal acquisition unit is connected with the input end of the control module;
and the dielectric loss signal acquisition unit is used for acquiring the test voltage and the test current on the sampling module, and the test voltage and the test current are used as the test voltage of the cable to be tested and the test current of the cable to be tested.
4. The apparatus of claim 3, wherein the sampling module comprises: a first resistor, a second resistor and a third resistor; one end of the first resistor is connected with one end of the second resistor, the other end of the first resistor is connected with the first output end of the high-voltage generator, and the other end of the second resistor is connected with the second output end of the high-voltage generator; one end of the third resistor is connected with the first output end of the high-voltage generator, and the other end of the third resistor is connected with one end of the cable to be tested; the second end of the high-voltage generator is grounded;
and the dielectric loss signal acquisition unit is used for acquiring the voltage of the second resistor and the current of the third resistor as the test voltage of the cable to be tested and the test current of the cable to be tested.
5. The apparatus of claim 4, wherein the resistance of the first resistor is greater than the resistance of the second resistor, and a difference between the resistance of the first resistor and the second resistor is greater than a predetermined threshold value;
the control module is further used for determining the test voltage of the cable to be tested according to the voltage of the second resistor, the resistance value of the first resistor and the resistance value of the second resistor;
and the control module is used for determining the dielectric loss value of the cable to be tested according to the test voltage of the cable to be tested and the test current of the cable to be tested.
6. The apparatus of claim 2, further comprising an analog-to-digital converter; the input end of the analog-to-digital converter is connected with the output end of the partial discharge test module; the output end of the analog-to-digital converter is connected with the input end of the control module;
the analog-to-digital converter is used for performing analog-to-digital conversion on the partial discharge signal to generate a digital partial discharge signal, and transmitting the digital partial discharge signal to the control module.
7. The apparatus of claim 6, further comprising: a wireless communication module; the input end of the wireless communication module is respectively connected with the output end of the control module and the output end of the analog-to-digital converter;
the wireless communication module is configured to send the working parameters, the fault detection result, or the digital partial discharge signal generated by the analog-to-digital converter, which are acquired by the control module, to a terminal.
8. The device according to claim 1, wherein the control module is further configured to receive a voltage boosting command or a voltage dropping command sent by the terminal, and generate the control command according to the voltage boosting command or the voltage dropping command.
9. The apparatus of claim 1, further comprising a power module;
and the power supply module is used for supplying power to the control module.
10. A cable fault detection system, the system comprising: a terminal and a cable fault detection device as claimed in any one of the preceding claims 1 to 9;
and the terminal is used for sending a voltage boosting command or a voltage reducing command to the cable fault detection device, receiving the working parameters and the fault detection result of the cable to be detected sent by the cable fault detection device and displaying the working parameters and the fault detection result.
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