CN112834873A - Partial discharge test system and cable test system - Google Patents
Partial discharge test system and cable test system Download PDFInfo
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The application relates to a test system and cable test system are put in office, and test system is put in office includes: the input end of the synchronization module is connected with the synchronous voltage output end of the test voltage generation device, and the output end of the synchronization module is wirelessly connected with the partial discharge test module; the synchronous module is used for acquiring a synchronous voltage signal from a synchronous voltage output end, processing the synchronous voltage signal to obtain synchronous information and sending the synchronous information to the partial discharge testing module; the synchronization information includes the frequency and phase of the synchronization voltage signal; and the partial discharge test module is used for carrying out partial discharge test on the object to be tested according to the frequency and the phase of the synchronous voltage signal. The system can isolate the partial discharge test module from the synchronous voltage, and a user does not need to manually contact the synchronous module when operating the partial discharge test module in the whole process of partial discharge test, so that the contact between the user and the synchronous voltage harmful to the human body and equipment is avoided, and unsafe accidents are prevented.
Description
Technical Field
The application relates to the technical field of power equipment testing, in particular to a partial discharge testing system and a cable testing system.
Background
The alternating current withstand voltage test is the most direct method for testing the quality of the cable, but the alternating current withstand voltage test cannot detect some local non-penetrating defects of the cable, and the local defects on the cable can be further developed and deteriorated under the high voltage of the alternating current withstand voltage test, so that the cable breaks down after being operated for a period of time in an electrified mode. Therefore, the partial discharge test needs to be performed on the cable and the accessories thereof while the alternating-current voltage withstand test is performed, so as to measure the partial discharge capacity of the cable and the accessories thereof, and further judge the construction quality and the insulation quality of the cable system according to the partial discharge capacity of the cable and the accessories thereof. When the partial discharge test is performed, because the partial discharge of the cable to be tested and the running voltage waveform of the cable to be tested have a phase relationship, when the partial discharge test is performed on the cable to be tested through the partial discharge test system, the partial discharge test system needs to adopt a waveform which is consistent with the frequency phase of the running voltage of the cable to be tested as a reference, so that the real condition of the partial discharge can be accurately diagnosed.
Currently, an partial discharge test system obtains a voltage signal from a low-voltage end of an ac withstand voltage test system, and completes synchronization of frequency and phase with an operating voltage of a cable to be tested based on the voltage signal.
However, in the conventional technology, when the partial discharge test is performed on the cable to be tested, the partial discharge test system often has a charged condition, so that the safety of the partial discharge test is poor.
Disclosure of Invention
In view of the above, it is desirable to provide a partial discharge test system and a cable test system.
A first aspect of an embodiment of the present application provides a partial discharge test system, including: the input end of the synchronization module is connected with the synchronous voltage output end of the test voltage generation device, and the output end of the synchronization module is wirelessly connected with the partial discharge test module;
the synchronous module is used for acquiring a synchronous voltage signal from a synchronous voltage output end, processing the synchronous voltage signal to obtain synchronous information and sending the synchronous information to the partial discharge testing module; the synchronization information includes the frequency and phase of the synchronization voltage signal;
and the partial discharge test module is used for carrying out partial discharge test on the object to be tested according to the frequency and the phase of the synchronous voltage signal.
In one embodiment, the synchronization module includes: the device comprises an operational amplifier circuit, a processor and a first wireless communication unit, wherein a synchronous voltage output end is connected with the processor through the operational amplifier circuit, and the processor is wirelessly connected with a partial discharge test module through the first wireless communication unit; the operational amplifier circuit is used for amplifying the voltage amplitude of the synchronous voltage signal when the voltage of the synchronous voltage signal is not more than the working voltage of the processor, and inputting the amplified synchronous voltage signal to the processor; the processor is used for processing the amplified synchronous voltage signal to obtain synchronous information and sending the synchronous information to the partial discharge testing module through the first wireless communication unit.
In one embodiment, the operational amplifier circuit includes: the synchronous voltage output end is connected with the processor through the operational amplification unit, the comparison unit and the inversion unit; the operational amplification unit is used for amplifying and limiting the voltage amplitude of the synchronous voltage signal; the comparison unit is used for carrying out waveform conversion processing on the processed synchronous voltage signal; the inverting unit is used for shaping the synchronous voltage signal after the waveform conversion.
In one embodiment, the synchronization module further includes: the input end of the voltage division circuit is connected with the synchronous voltage output end, and the output end of the voltage division circuit is connected with the processor; the voltage division circuit is used for measuring the voltage amplitude of the synchronous voltage signal when the voltage of the synchronous voltage signal is larger than the working voltage of the processor and transmitting the voltage amplitude to the processor.
In one embodiment, the synchronization module further includes: and the filter unit is used for filtering the synchronous voltage and inputting the filtered synchronous voltage to the operational amplifier circuit and the voltage dividing circuit respectively.
In one embodiment, the synchronization module further includes: and the display unit is electrically connected with the processor and is used for displaying the voltage amplitude of the synchronous voltage signal and the synchronous information.
In one embodiment, the partial discharge test module includes: the processor performs data interaction with the partial discharge tester through the first wireless communication unit and the second wireless communication unit.
In one embodiment, the operating frequency band of the first wireless communication unit and the second wireless communication unit is 2.4 GHZ.
In one embodiment, the test voltage generating device includes: the remote control module is wirelessly connected with the control loop, and the control loop is electrically connected with the test voltage generation module; the remote control module is used for sending a test signal to the control loop according to an operation instruction input by a user; the test signal carries a test voltage; and the control loop is used for controlling the test voltage generation module to output test voltage according to the received test signal and inputting the test voltage to the object to be tested to perform partial discharge test, wherein the test voltage comprises synchronous voltage.
A second aspect of an embodiment of the present application provides a cable test system, including: a test voltage generating device and the partial discharge test system; the partial discharge testing system is connected with the synchronous voltage output end of the test voltage generating device, and the partial discharge testing system and the test voltage generating device are both connected with the cable to be tested.
Above-mentioned test system and cable test system are put in office, this test system is put in office includes: the system comprises: the test device comprises a synchronous module and a partial discharge test module, wherein the input end of the synchronous module is connected with the synchronous voltage output end of the test voltage generation device, so that the synchronous module can acquire a synchronous voltage signal from the synchronous voltage output end and then process the synchronous voltage signal to obtain synchronous information, namely frequency and phase information of the synchronous voltage signal; the test voltage generating device is used for providing test voltage for an alternating current withstand voltage test or a partial discharge test for an object to be tested, the test voltage simulates the real operating voltage setting of the object to be tested, the voltage amplitude of the object to be tested during normal work is usually at the level of kilovolt or even ten thousand volts, and in order to achieve better test effect, the amplitude of the test voltage is usually also at the level of kilovolt or even ten thousand volts, so the test voltage generating device can be in a voltage environment harmful to human bodies and equipment, and the synchronous module is in wired connection with the test voltage generating device and can bring the voltage harmful to the human bodies and the equipment, the synchronous module in the partial discharge test system is in wireless connection with the partial discharge test module, the partial discharge test module can be just isolated from the synchronous module, and when a user performs the whole process of the partial discharge test, the synchronous module does not need to be manually contacted, so that the contact of a user and voltage harmful to a human body and equipment is avoided, and unsafe accidents are prevented.
Drawings
FIG. 1 is a block diagram of an embodiment of a partial discharge test system;
fig. 2 is a block diagram of a partial discharge test system according to another embodiment;
fig. 3 is a block diagram of a partial discharge test system according to another embodiment;
fig. 4 is a block diagram of a partial discharge test system according to another embodiment;
fig. 5 is a block diagram of a partial discharge test system according to another embodiment;
fig. 6 is a block diagram of a partial discharge test system according to another embodiment;
FIG. 7 is a block diagram of an exemplary test voltage generator;
FIG. 8 is a block diagram of a cable test system in one embodiment.
Description of reference numerals:
11. a test voltage generating device; 111. A remote control module; 112. A control loop;
113. a test voltage generation module; 12. A synchronization module; 121. An operational amplifier circuit;
1211. an operational amplification unit; 1212. A comparison unit; 1213. An inverting unit;
122. a processor; 123. A first wireless communication unit;
124. a voltage dividing circuit; 125. A filtering unit; 126. A display unit;
13. a partial discharge test module; 131. A second wireless communication unit;
132. partial discharge tester.
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 ac withstand voltage test is the most direct method for testing the quality of the cable, but the ac withstand voltage test cannot necessarily detect some local non-penetrating defects of the cable, i.e. the partial discharge condition of the cable. Several factors of partial discharge of the cable include: the electric field is too concentrated at a certain point; the solid medium has bubbles, and harmful impurities are not removed; the oil contains water, gas and suspended particles; in different media combinations, there is severe electric field distortion at the interface. Because the energy of the cable is small in the initial stage of partial discharge and the cable insulation breakdown is not caused immediately, the part of the cable which is not discharged is well insulated and can still bear the operating voltage of equipment. However, under a long-time operating voltage, the partial insulation damage on the cable caused by partial discharge continues to develop, and finally, the insulation accident of the cable is caused. Therefore, the partial discharge test of the cable is one of the important insulation monitoring means and is a better method for judging the long-term safe operation of the cable.
When the partial discharge test is performed on the cable to be tested, because the phase relationship exists between the partial discharge of the cable to be tested and the running voltage waveform of the cable to be tested, when the partial discharge test is performed on the cable to be tested through the partial discharge test system, the partial discharge test system needs to adopt the waveform which is consistent with the frequency and the phase of the running voltage of the cable to be tested as a reference, and the real condition of the partial discharge of the cable to be tested can be accurately diagnosed. Currently, an partial discharge test system acquires a voltage signal from a synchronization signal output end of a test voltage generation device, and completes synchronization of frequency and phase with an operating voltage of a cable to be tested based on the voltage signal. However, when the partial discharge test is performed on the cable to be tested in the conventional technology, because the partial discharge test system directly accesses the voltage signal from the test voltage generation device through the cable, and the test voltage generation device usually carries a voltage with an amplitude much higher than the power frequency voltage, which may cause damage to human bodies and equipment, the partial discharge test system may be connected with the test voltage generation device in a wired manner, so that the partial discharge test system also carries a voltage with an amplitude much higher than the power frequency voltage, and a user may get an electric shock when performing the partial discharge test wiring or disconnecting, thereby resulting in poor safety of the partial discharge test.
Fig. 1 is a schematic structural diagram of a partial discharge test system according to an embodiment of the present application, and as shown in fig. 1, the system includes: the test device comprises a synchronization module 12 and a partial discharge test module 13, wherein the input end of the synchronization module 12 is connected with the synchronization voltage output end of the test voltage generation device 11, and the output end of the synchronization module 12 is wirelessly connected with the partial discharge test module 13; the synchronization module 12 is configured to obtain a synchronization voltage signal from a synchronization voltage output end, process the synchronization voltage signal to obtain synchronization information, and send the synchronization information to the partial discharge test module 13; the synchronization information includes the frequency and phase of the synchronization voltage signal; and the partial discharge test module 13 is configured to perform a partial discharge test on the object to be tested according to the frequency and the phase of the synchronous voltage signal.
In this embodiment, the test voltage generating device 11 may include a test voltage output end and a synchronous voltage output end, a voltage amplitude of the test voltage output by the test voltage output end is greater than an amplitude of the power frequency voltage, a voltage amplitude of the synchronous voltage output end is less than an amplitude of the power frequency voltage, the test voltage output end is electrically connected to the object to be tested, and a test voltage signal for performing an ac withstand voltage test and a partial discharge test is provided for the object to be tested; the synchronous voltage output end is electrically connected with the synchronous module and provides a synchronous voltage signal for the synchronous module. The amplitude of the voltage output by the synchronous voltage output end is smaller than the amplitude of the power frequency voltage, so that the synchronous module 12 can obtain the synchronous voltage signal from the synchronous voltage output end without damaging the synchronous module 12. After the synchronization module 12 obtains the synchronization voltage signal, the synchronization voltage signal is processed, for example, the synchronization voltage signal is converted, calculated, classified, merged, extracted, and analyzed, so as to obtain synchronization information, which may be frequency information and phase information of the synchronization voltage signal. Because the local discharge of the cable to be tested and the running voltage waveform of the cable to be tested have a phase relationship, when the local discharge testing system is used for carrying out the local discharge testing on the cable to be tested, the local discharge testing system needs to adopt the waveform which is consistent with the frequency and the phase of the running voltage of the cable to be tested as a reference so as to accurately diagnose the real situation of the local discharge of the cable to be tested, so that the synchronization module 12 needs to send the synchronization information to the local discharge testing module 13 so that the local discharge testing module 13 can carry out the local discharge testing on the object to be tested under the condition that the frequency and the phase of the object to be tested are consistent. The method for transmitting the synchronization information may be a wireless method, and the wireless method may indicate that the two can communicate in any one or more wireless communication modes, such as infrared, bluetooth, wireless local area network, cellular network, and the like. It should be noted that, when the partial discharge test module is synchronized, the synchronization information is the frequency and phase information of the synchronization voltage signal, and the frequency and phase information has no relation with the voltage amplitude, so although the synchronization voltage signal obtained from the synchronization voltage output end by the synchronization module 12 is different from the voltage amplitude of the voltage loaded on the object to be tested, the frequency and phase of the synchronization voltage signal are the same, so that the synchronization of the partial discharge test device is not affected.
The synchronization module 12 may be a circuit formed by connecting a plurality of components together through a certain connection relationship, where the plurality of components include a component capable of acquiring a synchronization voltage signal, a component capable of processing the synchronization voltage signal to obtain synchronization information, a component capable of transmitting the synchronization information, and the like, and may further include conventional components such as a resistor and a capacitor; the synchronization module 12 may also be a device formed by connecting multiple devices together through a certain connection relationship, and can achieve the functions of acquiring a synchronization voltage signal, processing the synchronization voltage signal to obtain synchronization information, and transmitting the synchronization information. The synchronization module 12 may also be an integrated chip, and the integrated chip also needs to be capable of obtaining a synchronization voltage signal, processing the synchronization voltage signal to obtain synchronization information, and transmitting the synchronization information, which is not limited in this embodiment of the present application.
The test voltage generating device 11 may perform processing such as voltage boosting, voltage reducing, frequency modulation on the power frequency voltage to generate a test voltage, where the amplitude of the test voltage is higher than the power frequency voltage, and may obtain a synchronous voltage signal through voltage division, so that the synchronization module 12 can directly obtain the synchronous voltage signal from the synchronous signal output end. The test voltage generating device 11 may be a device formed by connecting a plurality of devices together through a certain connection relationship, and may include: the device comprises a controller, a regulating transformer, a low-frequency transformer, a high-frequency transformer, an inverter, a rectifier and the like; various components may also be included, such as: the device comprises a resistor, a capacitor, a silicon controlled rectifier and other components, wherein the components are combined together according to a certain connection relation to generate a test voltage by controlling connection or disconnection of a certain device and a certain circuit, so as to obtain a synchronous voltage, and realize synchronization of the partial discharge test module 13, the partial discharge test module 13 performs partial discharge test on an object to be tested after synchronization, the object to be tested can be a cable to be tested, electrical equipment to be tested and the like, and the partial discharge test module 13 performs partial discharge test on the cable to be tested or the electrical equipment to be tested, so as to identify the performance of the cable to be tested or the electrical equipment to be tested.
For example, the controller may control one low-frequency transformer in the start test voltage generation module 113, or two, three, or more low-frequency transformers to perform frequency conversion processing on the power frequency voltage, or may control one, two, three, or more voltage regulating transformers in the start test voltage generation module 113 to perform voltage transformation processing on the power frequency voltage; the controller may also control the start of one, two, three or more high-frequency transformers in the test voltage generation module 113, and at the same time, start one, two, three or more voltage-regulating transformers in the test voltage generation module 113 to adjust the voltage amplitude and frequency of the power frequency voltage, so that the test voltage generation module 113 can generate the test voltage, and further obtain the synchronous voltage.
The partial discharge test system provided by the embodiment of the application comprises: the test device comprises a synchronous module and a partial discharge test module, wherein the input end of the synchronous module is connected with the synchronous voltage output end of the test voltage generation device, so that the synchronous module can acquire a synchronous voltage signal from the synchronous voltage output end and then process the synchronous voltage signal to obtain synchronous information, namely frequency and phase information of the synchronous voltage signal; the test voltage generating device is used for providing test voltage for an alternating current withstand voltage test or a partial discharge test for an object to be tested, the test voltage simulates the real operating voltage setting of the object to be tested, the voltage amplitude of the object to be tested during normal work is usually at the level of kilovolt or even ten thousand volts, and in order to achieve better test effect, the amplitude of the test voltage is usually also at the level of kilovolt or even ten thousand volts, so the test voltage generating device can be in a voltage environment harmful to human bodies and equipment, and the synchronous module is in wired connection with the test voltage generating device and can bring the voltage harmful to the human bodies and the equipment, the synchronous module in the partial discharge test system is in wireless connection with the partial discharge test module, the partial discharge test module can be just isolated from the synchronous module, and when a user performs the whole process of the partial discharge test, the synchronous module does not need to be manually contacted, so that the contact of a user and voltage harmful to a human body and equipment is avoided, and unsafe accidents are prevented.
In one embodiment, fig. 2 is a schematic structural diagram of another partial discharge test system provided in the embodiment of the present application, and as shown in fig. 2, the synchronization module 12 includes: the operational amplifier circuit 121, the processor 122 and the first wireless communication unit 123, the synchronous voltage output end is connected with the processor 122 through the operational amplifier circuit 121, and the processor 122 is wirelessly connected with the partial discharge test module 13 through the first wireless communication unit 123; the operational amplifier circuit 121 is configured to amplify a voltage amplitude of the synchronous voltage signal when the voltage of the synchronous voltage signal is not greater than the working voltage of the processor 122, and input the amplified synchronous voltage signal to the processor 122; the processor 122 is configured to process the amplified synchronization voltage signal to obtain synchronization information, and send the synchronization information to the partial discharge test module 13 through the first wireless communication unit 123.
In this embodiment, the operational amplifier circuit 121 may be wired to the synchronous voltage output terminal to obtain the synchronous voltage signal from the synchronous voltage output terminal, the operational amplifier circuit 121 may perform preprocessing such as conversion, classification, merging, extraction, digital-to-analog conversion on the synchronous voltage signal, for example, the operational amplifier circuit 121 may convert the synchronous voltage signal into a waveform that can facilitate data reading, and facilitate the processor 122 to process the synchronous signal to obtain the synchronous information. The operational amplifier circuit 121 has two functions: when the input synchronous voltage signal is very small, the weak synchronous voltage signal can be amplified, the identification capability of the processor 122 on weak level change is improved, and the synchronization accuracy is improved; meanwhile, the operational amplifier circuit 121 may further limit the voltage amplitude of the output synchronous voltage signal, so as to prevent the interface of the processor 122 from being damaged due to the excessive voltage amplitude, where the interface may be an IO interface of the processor 122. The operational amplifier circuit 121 may be a circuit, the circuit includes components capable of obtaining and processing the synchronous voltage signal, for example, the components may include operational amplifiers, comparators, inverters, resistors, diodes, capacitors, and the like, the components may be combined in any one or more ways of parallel connection, serial connection, or a combination thereof to form the operational amplifier circuit 121, and the circuit may include all the components and may also include some components. The operational amplifier circuit 121 may also be a circuit formed by combining circuits that realize different functions, for example, the circuit may include an operational amplifier circuit, a comparator circuit, an inverter circuit, and the like. Here, the expression form of the operational amplifier circuit 121 is not limited.
The processor 122 is configured to process the synchronous voltage signal transmitted by the operational amplifier circuit 121, where the synchronous voltage signal may be input to the processor 122 in the form of a waveform diagram, so that the processor 122 directly reads the frequency and phase information of the synchronous voltage signal according to the waveform diagram, thereby improving the efficiency of synchronization, where the waveform diagram may be a square wave or the like, and the phase accuracy of a sine wave may be degraded under the influence of noise, so that the square wave is preferably output in the embodiment of the present application to improve the accuracy of synchronization. The processor 122 processes the synchronization voltage signal to obtain synchronization information, which may be, for example, converting, calculating, classifying, merging, extracting, analyzing, and the like, of the synchronization signal, and transmits the synchronization information to the partial discharge test module 13 through the first wireless communication unit 123. The processor 122 may be, for example, a single chip, which is not limited in this application.
In this embodiment, the processor 122 establishes wireless communication with the partial discharge test module 13 through the first wireless communication unit 123, where the first wireless communication unit 123 may be used to implement any one or more wireless communications such as infrared ray, bluetooth, wireless local area network, and cellular network, and the partial discharge test module 13 may receive a signal sent by the processor 122 through the first wireless communication unit 123, where the signal may indicate frequency and phase information of a current operating voltage of the object to be tested, so that the partial discharge test module 13 may perform a partial discharge test on the object to be tested according to the frequency and phase information.
The partial discharge test system that this application embodiment provided, the operational amplifier circuit in this system can carry out the enlargies of voltage amplitude to the synchronous voltage signal who obtains from the synchronous voltage output, promotes the treater to weak synchronous voltage signal's recognition capability, improves the efficiency that synchronous signal generated, further increases to the synchronous accuracy of partial discharge test module. Meanwhile, based on the description of the cause of the unsafe accident, the synchronization module and the partial discharge test module in the system perform data interaction through the first communication unit, the partial discharge test module and the synchronization module can be isolated, and a user does not need to manually contact the synchronization module in the whole process of the partial discharge test, so that the contact between the user and a synchronization voltage harmful to a human body and equipment is avoided, and the unsafe accident is prevented.
In one embodiment, fig. 3 is a schematic structural diagram of another partial discharge test system provided in the embodiment of the present application, and as shown in fig. 3, the operational amplifier circuit 121 includes: an operational amplification unit 1211, a comparison unit 1212, and an inversion unit 1213, the synchronous voltage output terminal being connected to the processor 122 through the operational amplification unit 1211, the comparison unit 1212, and the inversion unit 1213; an operational amplification unit 1211 configured to amplify and amplitude-limit the voltage amplitude of the synchronous voltage signal; a comparing unit 1212, configured to perform waveform conversion processing on the processed synchronous voltage signal; and an inverting unit 1213 for performing a shaping process on the waveform-converted synchronous voltage signal.
In this embodiment, the operational amplification unit 1211 may be connected to the synchronous voltage signal output terminal of the test voltage generation module 113 by a wired manner to obtain a synchronous voltage signal, and the amplitude of the synchronous voltage signal may be smaller than the operating voltage amplitude of the processor 122, so that the synchronous voltage signal is not beneficial to the receiving and processing of the processor 122, which may reduce the accuracy of the test, and therefore, the operational amplification unit 1211 is required to perform the voltage amplitude amplification processing on the synchronous voltage signal, so as to facilitate the receiving and processing of the processor 122, and improve the efficiency and accuracy of the synchronization. The operational amplifier 1211 may be an operational amplifier, and may also be an operational amplifier circuit, where the circuit may include components such as an operational amplifier, a resistor, a capacitor, and the like, and the components may be combined in any one or more of parallel connection, series connection, or a combination thereof, so as to form a circuit for amplifying the amplitude of the synchronous voltage signal. The operational amplifier circuit may output a waveform of the synchronous voltage signal, and the waveform may be a sine wave waveform, a sawtooth wave waveform, or the like, and the expression form and the output waveform of the operational amplifier unit 1211 are not limited herein.
The operational amplification unit 1211 amplifies the synchronous voltage signal and then enters a comparison unit 1212, where the comparison unit 1212 may be used to convert the waveform diagram output by the operational amplification unit 1211, for example, a sine wave, a sawtooth wave, or the like into a square wave, and the phase of the square wave output is more accurate than the other two waveforms. The comparing unit 1212 may be a comparator, or a comparing circuit, and the comparing circuit may include: the synchronous voltage signal processing circuit comprises a comparator, an integrator, a differential amplifier, a triode, a diode, a resistor, a capacitor and other components, wherein the components can be combined together in any one or more modes of parallel connection, serial connection or combination of the two, or can be partially combined together to form a circuit for carrying out waveform conversion on a synchronous voltage signal. The expression of the comparison unit 1212 is not limited in this application.
After the waveform of the synchronous voltage signal is converted by the comparing unit 1212, the waveform is shaped by the inverting unit 1213. Shaping can modify the distorted waveform to obtain a waveform that is convenient for processing by processor 122, and inverting unit 1213 can also expand the amplitude of the waveform to further facilitate processing by processor 122. The inverting unit 1213 may be an inverter or an inverter circuit. The inverting unit 1213 may have other different expressions, which are not limited in this application.
According to the partial discharge test system provided by the embodiment of the application, the operational amplifier circuit in the system can preprocess the synchronous voltage signal through the operational amplifier unit, the comparison unit and the phase reversal unit so as to obtain the synchronous voltage signal which is convenient to receive and process by the processor, and the acquisition efficiency of the synchronous information is improved.
In one embodiment, fig. 4 is a schematic structural diagram of another partial discharge test system provided in the embodiment of the present application, and as shown in fig. 4, the synchronization module 12 further includes: the input end of the voltage division circuit 124 is connected with the synchronous voltage output end, and the output end of the voltage division circuit 124 is connected with the processor 122; the voltage divider circuit 124 is configured to measure a voltage amplitude of the synchronous voltage signal when the voltage of the synchronous voltage signal is greater than an operating voltage of the processor 122, and transmit the voltage amplitude to the processor 122.
In this embodiment, when the voltage amplitude of the input synchronous voltage signal is greater than the power supply voltage of the processor 122, the processor 122 cannot measure the true input voltage of the synchronous voltage signal, and since the operational amplifier circuit 121 has a clipping function on the input voltage of the synchronous voltage signal, and cannot measure the true input voltage of the synchronous voltage signal through the operational amplifier circuit 121, it needs to measure the input voltage through the voltage divider circuit 124, an output end of the voltage divider circuit 124 is connected to an interface of the processor 122 to transmit the measured true voltage value of the synchronous voltage signal to the processor 122, where the interface may be an AD port of the processor 122, the AD port is a port for inputting an analog quantity (voltage amplitude), and an AD circuit is connected behind the port, and the AD circuit can convert the input analog quantity into a digital quantity that can be recognized by the processor 122 for the processor 122 to process the voltage value. The voltage divider circuit 124 may include: the device comprises components such as a resistor, a slide rheostat, a capacitor, a triode, a diode and the like, wherein the components can be combined together in any one or more modes of parallel connection, serial connection or combination of the two, or can be partially combined together to form a circuit for dividing a synchronous voltage signal. The expression of the voltage divider circuit 124 is not limited herein.
According to the partial discharge test system provided by the embodiment of the application, the bleeder circuit in the system can measure the real voltage value of the synchronous voltage signal and transmit the voltage value to the processor, and the processor transmits the voltage value to the partial discharge test module, so that a user can know the real voltage value running on an object to be tested in real time, and timely adjust the partial discharge test process according to the voltage value, so that the test is more accurate.
In one embodiment, fig. 5 is a schematic structural diagram of another partial discharge test system provided in the embodiment of the present application, and as shown in fig. 5, the synchronization module 12 further includes: the filter unit 125, the synchronous voltage output end is connected to the operational amplifier circuit 121 and the voltage divider circuit 124 through the filter unit 125, and the filter unit 125 is configured to filter the synchronous voltage and input the filtered synchronous voltage to the operational amplifier circuit 121 and the voltage divider circuit 124.
In this embodiment, the filtering unit 125 may be connected to the synchronous voltage signal output end of the test voltage generating device 11 by a wired manner to obtain a synchronous voltage signal, and filter the synchronous voltage signal, so as to effectively filter a frequency point of a specific frequency or frequencies other than the frequency point in the input synchronous voltage signal, so as to facilitate subsequent processing of the synchronous voltage signal. The filtering unit 125 may be a filter, a filtering circuit composed of a capacitor, an inductor, and a resistor, or a circuit composed of other components, and the representation form of the filtering unit 125 is not limited herein.
The partial discharge test system provided by the embodiment of the application, the filtering unit in the system can effectively filter the frequency point of specific frequency or frequencies except the frequency point in the input synchronous voltage signal, avoids interference of useless signals to the synchronous voltage signal, is convenient for subsequent processing, improves the processing efficiency of the operational amplifier circuit, the bleeder circuit and the processor to the synchronous voltage signal, and further improves the synchronous efficiency and the test accuracy.
In one embodiment, as shown in fig. 5, the synchronization module 12 further includes: and a display unit 126, the display unit 126 being electrically connected to the processor 122, the display unit 126 being configured to display the voltage amplitude of the synchronization voltage signal and the synchronization information.
In this embodiment, the display unit 126 may be disposed on the processor 122, or may be an external device connected to the processor 122, and the display unit 126 may be a display screen to display data in the synchronization process of the partial discharge test in real time.
According to the partial discharge test system provided by the embodiment of the application, the display unit in the system can display data in the partial discharge test synchronization process, the data generated in the partial discharge test process can be monitored conveniently in real time, timely adjustment can be performed on the synchronization process and/or the partial discharge test process according to the displayed data, reliable data support is provided for the test, and the test efficiency and accuracy can be improved.
In one embodiment, fig. 6 is a schematic structural diagram of another partial discharge test system provided in the embodiment of the present application, and as shown in fig. 6, the partial discharge test module 13 includes: the second wireless communication unit 131 and the partial discharge tester 132, and the processor 122 performs data interaction with the partial discharge tester 132 through the first wireless communication unit 123 and the second wireless communication unit 131.
In this embodiment, the partial discharge tester 132 can perform a partial discharge test on the object to be tested, and the partial discharge tester 132 is connected to a ground line of the object to be tested to perform a partial discharge test, so that the partial discharge tester 132 does not carry a test voltage through the object to be tested, thereby ensuring the use safety of a user. The partial discharge tester 132 can perform wireless communication with the processor 122 through the second wireless communication unit 131 and the first wireless communication unit 123 to realize data interaction, the object to be tested can be an electrical cable, an electrical device, and the like, and the process and principle of performing a partial discharge test on the object to be tested through the partial discharge tester 132 are prior art and are not described herein. The second wireless communication unit 131 is a communication module different from the first wireless communication unit 123, and may be identical or different in function. In this embodiment, the partial discharge tester 132 establishes wireless communication with the synchronization module 12 through the second wireless communication unit 131, the second wireless communication unit 131 may be used to implement any one or more wireless communications such as infrared, bluetooth, wireless local area network, cellular network, and the like, the partial discharge tester 132 may receive a synchronization signal sent by the synchronization module 12 through the second wireless communication unit 131, where the synchronization signal may be a signal indicating a current operating voltage frequency and phase of the object to be tested, so that the partial discharge tester 132 can perform a partial discharge test on the object to be tested according to the frequency and phase information.
According to the partial discharge test system provided by the embodiment of the application, the partial discharge tester in the system performs wireless data interaction with the synchronization module through the second wireless communication unit, so that the partial discharge tester is isolated from the synchronization voltage, a user is protected when the user operates the partial discharge tester, zero contact between the user and the synchronization module is realized, contact between the user and the synchronization voltage harmful to a human body and equipment is avoided, and unsafe accidents are prevented.
In one embodiment, the operating frequency band of the first wireless communication unit 123 and the second wireless communication unit 131 is 2.4 GHZ. The 2.4GHz wireless technology is a short-distance wireless transmission technology for open source use. 2.4GHz is the wireless frequency channel of the open general use all over the world, and bluetooth technology works in this frequency channel promptly, and work under 2.4GHz frequency channel can obtain bigger application range and stronger interference killing feature, uses in this application embodiment for realize the wireless communication of synchronization module 12 and partial discharge test module 13, can guarantee that data does not receive the interference of other data in the interaction process, has improved the accuracy of synchronization and partial discharge test.
In one embodiment, fig. 7 is a schematic structural diagram of a test voltage generating device 11 provided in the embodiment of the present application, and as shown in fig. 7, the test voltage generating device 11 includes: the device comprises a remote control module 111, a control loop 112 and a test voltage generation module 113, wherein the remote control module 111 is wirelessly connected with the control loop 112, and the control loop 112 is electrically connected with the test voltage generation module 113; a remote control module 111 for sending a test signal to the control loop 112 according to an operation instruction input by a user; the test signal carries a test voltage; and the control loop 112 is configured to control the test voltage generation module 113 to output a test voltage according to the received test signal, and input the test voltage to the object to be tested to perform a partial discharge test, where the test voltage includes a synchronous voltage.
In this embodiment, the remote control module 111 may be a handheld controller, for example, a portable computer, a mobile phone, a handheld computer, an AI terminal device, etc. having a signal transceiving function, and the handheld controller may be powered by a power source in a wired manner or may be powered by a battery. The user can move the handheld controller at will in a remote communication range according to own will, the handheld controller can be provided with keys, and the user can operate the handheld controller through the keys; the handheld controller can also be provided with a touch screen, a user can operate the handheld controller on the touch screen, and the application does not limit the mode of the user for operating the handheld controller. The remote control module 111 may also be a non-handheld controller with a wireless communication module, such as a server, a desktop computer, etc., and may also be provided with buttons or a touch screen for the user to operate. The present application is not limited to the representation of the remote control module 111. A user may input an operation instruction on the remote control module 111 through a key or a touch manner, so that the remote control module 111 generates a corresponding test signal according to the operation instruction, and transmits the test signal to the control loop 112 through a wireless transmission manner, where the test signal carries frequency and amplitude information of a test voltage, for example, the test signal represents a test voltage with a generated voltage amplitude of 80KV and a frequency of 0.1 HZ. In this way, the control circuit 112 controls the test voltage generation module 113 to generate a test voltage with a corresponding frequency and amplitude according to the test signal, so as to perform an ac voltage withstand test on the object to be tested.
The control circuit 112 may receive the test signal transmitted by the remote control module 111 by using a wireless communication method such as infrared ray, bluetooth, wireless lan, cellular network, etc. The control circuit 112 may control the test voltage generation module 113 to perform a series of processing such as voltage boosting, voltage reducing, frequency modulating, and the like on the accessed power frequency voltage to generate the test voltage. The control circuit 112 may be a circuit formed by connecting a plurality of components together through a certain connection relationship, among the plurality of components, there may be a component capable of wirelessly receiving a test signal, a component capable of analyzing the test signal, a component capable of controlling the test voltage generation module 113, and the like, and may further include conventional components such as a resistor, a capacitor, and the like; the control circuit 112 may also be an integrated chip, which can implement the functions of receiving the test signal, analyzing the test signal, and controlling the test voltage generation module 113. After receiving the test signal sent by the remote control module 111, the control circuit 112 analyzes the test signal to generate corresponding operation commands, where each operation command corresponds to an operation of the test voltage generation module 113, for example, the operation commands are: controlling the test voltage generation module 113 to start the boost unit, the corresponding test voltage generation module 113 operates as follows: and starting the boosting unit. After receiving the operation command, the test voltage generation module 113 performs, for example, connection between the voltage boosting unit and the power frequency voltage so that the voltage boosting unit boosts the power frequency voltage, and for example, the voltage boosting unit may be a voltage regulating transformer. The power frequency voltage is adjusted by the test voltage generation module 113 to generate a test voltage matched with the voltage amplitude of the test signal.
The test voltage generation module 113 is configured to generate a test voltage according to the control of the control loop 112, where the test voltage includes a synchronous voltage for synchronization, and the control may be that the test voltage generation module 113 completes corresponding operations according to an operation instruction of the control loop 112, where the operations may be performing processing such as voltage boosting, voltage reducing, and frequency modulation on the power frequency voltage. For example, the frequency conversion processing may be performed on the power frequency voltage by starting one low-frequency transformer in the test voltage generation module 113, or by starting two, three, or more low-frequency transformers, or by starting one, two, three, or more voltage-regulating transformers in the test voltage generation module 113 to perform voltage transformation processing on the power frequency voltage; one, two, three or more high-frequency transformers in the test voltage generation module 113 may also be started, and one, two, three or more voltage regulating transformers in the test voltage generation module 113 are started to regulate the voltage amplitude and the frequency of the power frequency voltage, so that the test voltage generation module 113 can generate a test voltage matched with the voltage amplitude and the frequency of the test signal. The test voltage generation module 113 may be a device formed by connecting a plurality of devices together through a certain connection relationship, and may include: voltage regulating transformers, low frequency transformers, high frequency transformers, inverters, rectifiers and other devices; various components may also be included, such as: the device comprises components such as a resistor, a capacitor, a silicon controlled rectifier and the like, which are combined together according to a certain connection relation and are used for controlling the connection or disconnection of a certain device and a certain circuit; the method comprises the steps of generating test voltage matched with the voltage amplitude and frequency of a test signal by switching on or switching off certain equipment and certain circuits, inputting the test voltage to an object to be tested, providing a synchronous voltage signal for partial discharge test of the object to be tested so as to perform alternating current withstand voltage test and partial discharge test on the object to be tested, wherein the object to be tested can be a cable to be tested, electrical equipment to be tested and the like, the cable to be tested or the electrical equipment to be tested completes the alternating current withstand voltage test and the partial discharge test according to the test voltage, and the performance of the cable to be tested or the electrical equipment to be tested can be identified.
The utility model provides a test voltage generation device, in the device, because remote control module and control circuit wireless connection, so remote control module can send test signal to control circuit according to user input's operating instruction, carry experimental voltage in this test signal, because control circuit is connected with experimental voltage generation module electricity again, so control circuit can control experimental voltage generation module output test voltage according to received test signal, and input to the object to be measured, simultaneously, still can provide synchronous voltage signal for the object to be measured carries out the test of partial discharge, with carry out AC withstand voltage test and the test of partial discharge to the object to be measured. Because the test voltage generated by the test voltage generation module is a voltage harmful to a human body and equipment, the partial discharge test module provided by the application is in wireless connection with the synchronous module, the partial discharge test module can be just isolated from the synchronous voltage and also isolated from the test voltage generation device, and a user does not need to manually contact the synchronous module and the test voltage generation device when operating the partial discharge test module in the whole process of performing partial discharge test, so that the contact between the user and the synchronous voltage and the test voltage harmful to the human body and the equipment is avoided, and unsafe accidents are prevented.
A second aspect of an embodiment of the present application provides a cable test system, including: a test voltage generating device 11 and the partial discharge test system; the partial discharge test system is connected with the synchronous voltage output end of the test voltage generation device 11, and the partial discharge test system and the test voltage generation device 11 are both connected with a cable to be tested.
In this embodiment, the test voltage generating device 11 can provide a test voltage signal for testing a cable to be tested, and simultaneously can also provide a synchronous voltage signal for the partial discharge test system, so that the partial discharge test system can generate synchronous information according to the synchronous voltage signal, and the synchronous information can synchronize the partial discharge tester 132, so that the partial discharge tester 132 can perform a partial discharge test on the cable in an environment consistent with the frequency and the phase of the operating voltage of the cable to be tested, and the accuracy of the partial discharge test on the cable to be tested is improved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples 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 partial discharge test system, comprising: the input end of the synchronization module is connected with the synchronous voltage output end of the test voltage generation device, and the output end of the synchronization module is wirelessly connected with the partial discharge test module;
the synchronous module is used for acquiring a synchronous voltage signal from the synchronous voltage output end, processing the synchronous voltage signal to obtain synchronous information and sending the synchronous information to the partial discharge testing module; the synchronization information comprises the frequency and phase of the synchronization voltage signal;
and the partial discharge test module is used for carrying out partial discharge test on the object to be tested according to the frequency and the phase of the synchronous voltage signal.
2. The system of claim 1, wherein the synchronization module comprises: the synchronous voltage output end is connected with the processor through the operational amplifier circuit, and the processor is wirelessly connected with the partial discharge test module through the first wireless communication unit;
the operational amplifier circuit is used for amplifying the voltage amplitude of the synchronous voltage signal when the voltage of the synchronous voltage signal is not greater than the working voltage of the processor, and inputting the amplified synchronous voltage signal to the processor;
the processor is configured to process the amplified synchronous voltage signal to obtain the synchronous information, and send the synchronous information to the partial discharge test module through the first wireless communication unit.
3. The system of claim 2, wherein the op-amp circuit comprises: the synchronous voltage output end is connected with the processor through the operational amplification unit, the comparison unit and the inversion unit;
the operational amplification unit is used for amplifying and limiting the voltage amplitude of the synchronous voltage signal;
the comparison unit is used for carrying out waveform conversion processing on the processed synchronous voltage signal;
and the phase inversion unit is used for shaping the synchronous voltage signal after the waveform conversion.
4. The system of claim 3, wherein the synchronization module further comprises: the input end of the voltage division circuit is connected with the synchronous voltage output end, and the output end of the voltage division circuit is connected with the processor;
the voltage division circuit is used for measuring the voltage amplitude of the synchronous voltage signal when the voltage of the synchronous voltage signal is greater than the working voltage of the processor, and transmitting the voltage amplitude to the processor.
5. The system of claim 4, wherein the synchronization module further comprises: the synchronous voltage output end is respectively connected with the operational amplifier circuit and the voltage division circuit through the filter unit,
and the filtering unit is used for filtering the synchronous voltage and respectively inputting the filtered synchronous voltage to the operational amplifier circuit and the voltage division circuit.
6. The system of claim 5, wherein the synchronization module further comprises: a display unit electrically connected with the processor,
the display unit is used for displaying the voltage amplitude of the synchronous voltage signal and the synchronous information.
7. The system of claim 6, wherein the partial discharge test module comprises: the processor performs data interaction with the partial discharge tester through the first wireless communication unit and the second wireless communication unit.
8. The system of claim 7, wherein the operating frequency band of the first wireless communication unit and the second wireless communication unit is 2.4 GHZ.
9. The system of any one of claims 1-8, wherein the test voltage generation device comprises: the remote control module is wirelessly connected with the control loop, and the control loop is electrically connected with the test voltage generation module;
the remote control module is used for sending a test signal to the control loop according to an operation instruction input by a user; the test signal carries a test voltage;
the control loop is used for controlling the test voltage generation module to output the test voltage according to the received test signal and inputting the test voltage to the object to be tested to perform partial discharge test; wherein the test voltage comprises the synchronous voltage.
10. A cable testing system, comprising: a test voltage generating device and a partial discharge test system according to any one of claims 1 to 8;
the partial discharge testing system is connected with the synchronous voltage output end of the test voltage generating device, and the partial discharge testing system and the test voltage generating device are connected with a cable to be tested.
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Application publication date: 20210525 |