Insulation test circuit, device and system

Abstract

The utility model discloses an insulativity test circuit, device and system. The insulating property test circuit comprises a main control module, a signal output module and a signal acquisition module, the signal output module is used for outputting multiple groups of test signals to the single-phase winding; the signal acquisition module is connected with a connection node between the signal output module and the single-phase winding and is used for acquiring a detection signal corresponding to each test signal; and the main control module is connected with the signal output module and the signal acquisition module. The insulativity test circuit can output multiple groups of test signals to the single-phase winding and acquire the detection signal corresponding to the single-phase winding under each group of test signals so as to determine the corresponding insulativity detection results of the single-phase winding under different test signals, so that the insulativity of the single-phase winding can be subjected to margin test; therefore, the problem of insulativity exposure of the winding due to aging or change of working conditions in actual work is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of insulation testing, in particular to an insulation testing circuit, device and system. Background Art

[0002] The insulation of servo motors plays a vital role in their normal operation and safety. Common high-voltage test instruments can detect insulation problems between windings and motor housings. However, when detecting the insulation of a certain phase winding or between windings, due to the small resistance between windings, the high-voltage test instrument can only output a very small current, which is not suitable for detecting the insulation of the winding itself or between windings. The existing insulation inspection for single-phase windings is usually performed directly by a multimeter or LCR meter when the servo motor is running. However, the motor may have problems such as damage to the enameled wire during long-term operation, which will lead to reduced insulation of the coil winding. The use of a multimeter or LCR meter can only detect insulation problems that occur during the test process, and cannot eliminate potential insulation faults. There is a lack of test solutions with margin for the test of single-phase windings or insulation performance between windings. Utility Model Content

[0003] The embodiments of the utility model provide an insulation test circuit, a device and a system to solve the problem that the existing insulation test method cannot detect the potential insulation fault of the winding.

[0004] The utility model embodiment provides an insulation test circuit, including a main control module, a signal output module and a signal acquisition module;

[0005] The signal output module is used to be connected to the single-phase winding and output multiple groups of test signals to the single-phase winding;

[0006] The signal acquisition module is connected to the connection node between the signal output module and the single-phase winding, and is used to collect a detection signal corresponding to each test signal when the test signal passes through the single-phase winding;

[0007] The main control module is connected to the signal output module and the signal acquisition module, and is used to control the signal output module to output multiple groups of test signals to the single-phase winding, and is also used to receive detection signals corresponding to the multiple groups of test signals output by the signal acquisition module.

[0008] Preferably, the signal output module includes a power amplification unit and a transformer unit;

[0009] The main control module is connected to the first end of the power amplification unit and is used to output a first signal to the power amplification unit;

[0010] The second end of the power amplifier unit is connected to the primary winding of the transformer unit, the secondary winding of the transformer unit is connected to the single-phase winding, the power amplifier unit is used to perform power amplification processing on the first signal and output a second signal to the transformer unit, and the transformer unit is used to perform voltage conversion on the second signal and output a test signal to the single-phase winding.

[0011] Preferably, the signal output module further includes a digital-to-analog conversion module;

[0012] The digital-to-analog conversion module is connected between the main control module and the power amplification unit, and is used for performing digital-to-analog conversion on the signal output by the main control module.

[0013] Preferably, the signal acquisition module includes a current acquisition unit and a voltage acquisition unit;

[0014] The first end of the current acquisition unit is connected to the secondary winding of the transformer unit, and the second end of the current acquisition unit is connected to the main control module, and is used to collect a current detection signal corresponding to each test signal when the test signal passes through the single-phase winding, and send the current detection signal to the main control module;

[0015] The first end of the voltage acquisition unit is connected to a connection node between a transformer unit and a single-phase winding, and the second end of the voltage acquisition unit is connected to the main control module, and is used to collect a voltage detection signal corresponding to each test signal when the test signal passes through the single-phase winding, and send the voltage detection signal to the main control module.

[0016] Preferably, the current collection unit comprises a current collection resistor;

[0017] A first end of the current collection resistor is connected to the secondary winding of the transformer unit, and a second end of the current collection resistor is grounded;

[0018] The main control module is connected to a connection node between the current collection resistor and the transformer unit.

[0019] Preferably, the voltage acquisition unit comprises a first voltage-dividing resistor and a second voltage-dividing resistor;

[0020] A first end of the first voltage-dividing resistor is connected to a connection node between a transformer unit and a single-phase winding, a second end of the first voltage-dividing resistor is connected to a first end of a second voltage-dividing resistor, and a second end of the second voltage-dividing resistor is grounded;

[0021] The main control module is connected to the second end of the first voltage-dividing resistor.

[0022] Preferably, the signal acquisition module further includes a first analog-to-digital conversion module and a second analog-to-digital conversion module;

[0023] The first analog-to-digital conversion module is connected between the main control module and the current acquisition unit, and is used to perform analog-to-digital conversion on the current detection signal;

[0024] The second analog-to-digital conversion module is connected between the main control module and the voltage acquisition unit, and is used for performing analog-to-digital conversion on the voltage detection signal.

[0025] Preferably, the main control module includes any one of a digital signal processor, a programmable gate array and a microcontroller.

[0026] An embodiment of the utility model further provides an insulation testing device, comprising a housing and any one of the above insulation testing circuits arranged in the housing.

[0027] The embodiment of the utility model also provides an insulation test system, comprising a host computer and the above insulation test device;

[0028] The host computer is connected to the main control module and is used to send a test instruction to the main control module so that the main control module controls the signal output module to output multiple groups of test signals to the single-phase winding, receives the detection signals corresponding to the multiple groups of test signals output by the main control module, and determines the detection results corresponding to the single-phase winding according to the detection signals.

[0029] The insulation test circuit, device and system provided by the embodiment of the utility model can output multiple groups of test signals to the single-phase winding by setting a main control module, a signal output module and a signal acquisition module, and obtain the detection signal corresponding to the single-phase winding under each group of test signals to determine the insulation detection results corresponding to the single-phase winding under different test signals. It can form a margin test on the insulation of the single-phase winding to prevent the winding from exposing insulation problems due to aging or changes in working conditions in actual work, thereby ensuring that the insulation performance of the winding is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 The utility model is a circuit structure diagram of an insulation test circuit in one embodiment.

[0032] In the figure: 1. main control module; 2. signal output module; 21. power amplifier unit; 22. transformer unit; 23. digital-to-analog conversion module; 3. signal acquisition module; 31. current acquisition unit; 32. voltage acquisition unit; 33. first analog-to-digital conversion module; 34. second analog-to-digital conversion module; 4. single-phase winding. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be understood that the utility model can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and fully convey the scope of the utility model to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0035] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. On the contrary, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0036] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0037] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be a limitation of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising" when used in this specification determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0038] In order to thoroughly understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0039] The utility model embodiment provides an insulation test circuit, such as Figure 1 As shown, it includes a main control module 1, a signal output module 2 and a signal acquisition module 3; the signal output module 2 is used to be connected to the single-phase winding 4 and output multiple groups of test signals to the single-phase winding 4; the signal acquisition module 3 is connected to the connection node between the signal output module 2 and the single-phase winding 4, and is used to collect the detection signal corresponding to each test signal when the test signal passes through the single-phase winding 4; the main control module 1 is connected to the signal output module 2 and the signal acquisition module 3, and is used to control the signal output module 2 to output multiple groups of test signals to the single-phase winding 4, and is also used to receive the detection signals corresponding to the multiple groups of test signals output by the signal acquisition module 3.

[0040] As an example, the insulation test circuit includes a main control module 1, a signal output module 2 and a signal acquisition module 3. The signal output module 2 is used to connect to the single-phase winding 4, the signal acquisition module 3 is connected to the connection node between the signal output module 2 and the single-phase winding 4, and the main control module 1 is connected to the signal output module 2 and the signal acquisition module 3. Among them, the insulation test circuit may include at least one signal output module 2 and at least one signal acquisition module 3, one signal output module 2 and one signal acquisition module 3 are correspondingly connected to a single-phase winding 4, for example, connected to the R-phase winding, at least one signal output module 2 and at least one signal acquisition module 3 are connected to the main control module 1, so that the insulation test circuit can perform insulation tests on multiple single-phase windings 4 at the same time. The main control module 1 is used to control the signal output module 2 to output multiple groups of test signals to the single-phase winding 4, and receive the detection signal corresponding to each test signal fed back by the signal acquisition module 3. The detection signal can be processed in the main control module 1 to obtain the insulation test result of the single-phase winding 4, or the main control module 1 can also be connected to the host computer. Under the control of the host computer, the control signal output module 2 outputs multiple groups of test signals to the single-phase winding 4, and after receiving the detection signal, the main control module 1 continues to transmit the detection signal to the host computer for processing to obtain the insulation test result of the single-phase winding 4.

[0041] In this example, the main control module 1 is connected to the host computer, and the detection signal is processed in the host computer as an example for explanation. During the test process, the main control module 1 is controlled by the host computer, and the control signal output module 2 outputs a group of test signals to the single-phase winding 4. The group of test signals can be an AC voltage signal of several sine wave cycles. The voltage values ​​of the AC voltage signals in different groups of test signals are different. When the test signal passes through the single-phase winding 4, the signal acquisition module 3 can detect the detection signal corresponding to the test signal, such as a current detection signal or a voltage detection signal. The main control module 1 connected to the signal acquisition module 3 can receive the detection signal and transmit it to the host computer, so that the host computer calculates the resistance and inductance corresponding to the single-phase winding 4 according to the obtained current detection signal and voltage detection signal. If the calculated resistance and inductance are within the preset range at this time, the host computer continues to control the insulation test circuit to output another test signal with a higher voltage value to test the single-phase winding 4 until the voltage value corresponding to the test signal reaches the upper limit of the voltage value. If during the test process, under a certain set of test signals, the resistance and inductance corresponding to the single-phase winding 4 calculated by the host computer are not within the preset range, it means that the single-phase winding 4 has an insulation problem. If during the test process, under each set of test signals, the resistance and inductance corresponding to the single-phase winding 4 calculated by the host computer are within the preset range, it means that the single-phase winding 4 does not have an insulation problem.

[0042] In this example, by setting the main control module 1, the signal output module 2 and the signal acquisition module 3, multiple groups of test signals can be output to the single-phase winding 4, and the detection signal corresponding to the single-phase winding 4 under each group of test signals can be obtained to determine the insulation detection results corresponding to the single-phase winding 4 under different test signals. A margin test can be formed on the insulation of the single-phase winding 4 to prevent the winding from exposing insulation problems due to aging or changes in working conditions in actual work, thereby ensuring that the insulation performance of the winding is good.

[0043] In one embodiment, the signal output module 2 includes a power amplifier unit 21 and a transformer unit 22; the main control module 1 is connected to the first end of the power amplifier unit 21, and is used to output a first signal to the power amplifier unit 21; the second end of the power amplifier unit 21 is connected to the primary winding of the transformer unit 22, and the secondary winding of the transformer unit 22 is connected to the single-phase winding 4. The power amplifier unit 21 is used to perform power amplification processing on the first signal and output a second signal to the transformer unit 22. The transformer unit 22 is used to perform voltage conversion on the second signal and output a test signal to the single-phase winding 4.

[0044] As an example, the signal output module 2 includes a power amplifier unit 21 and a transformer unit 22. The main control module 1 is connected to a first end of the power amplifier unit 21, a second end of the power amplifier unit 21 is connected to a primary winding of the transformer unit 22, and a secondary winding of the transformer unit 22 is connected to the single-phase winding 4.

[0045] During the test, the main control module 1 outputs a first signal to the power amplifier unit 21. The first signal can be an AC signal with a preset frequency and voltage value of several sinusoidal wave periods. The power amplifier unit 21 performs power amplification processing on the first signal and outputs a second signal to the transformer unit 22. The transformer unit 22 can be an AC transformer, which can further boost the second signal so that the final output test signal can be several times higher than the working voltage of the single-phase winding 4, ensuring that potential insulation problems in the single-phase winding 4 can be fully detected.

[0046] In one embodiment, the signal output module 2 further includes a digital-to-analog conversion module 23 ; the digital-to-analog conversion module 23 is connected between the main control module 1 and the power amplification unit 21 , and is used to perform digital-to-analog conversion on the signal output by the main control module 1 .

[0047] As an example, the signal output module 2 also includes a digital-to-analog conversion module 23. The digital-to-analog conversion module 23 is connected between the main control module 1 and the power amplifier unit 21. Since the main control module 1 is generally a digital signal processor, a programmable gate array, or a microcontroller, etc., the pins can usually only process digital signals. Therefore, it is necessary to add a digital-to-analog conversion module 23 between the main control module 1 and the power amplifier unit 21 to perform digital-to-analog conversion, so that the power amplifier unit 21 can perform power amplification processing on the signal output by the main control module 1.

[0048] In one embodiment, the signal acquisition module 3 includes a current acquisition unit 31 and a voltage acquisition unit 32; a first end of the current acquisition unit 31 is connected to the secondary winding of the transformer unit 22, and a second end of the current acquisition unit 31 is connected to the main control module 1, and is used to collect a current detection signal corresponding to each test signal when the test signal passes through the single-phase winding 4, and send the current detection signal to the main control module 1; a first end of the voltage acquisition unit 32 is connected to a connection node between a transformer unit 22 and the single-phase winding 4, and a second end of the voltage acquisition unit 32 is connected to the main control module 1, and is used to collect a voltage detection signal corresponding to each test signal when the test signal passes through the single-phase winding 4, and send the voltage detection signal to the main control module 1.

[0049] As an example, the signal acquisition module 3 includes a current acquisition unit 31 and a voltage acquisition unit 32. A first end of the current acquisition unit 31 is connected to the secondary winding of the transformer unit 22, a second end of the current acquisition unit 31 is connected to the main control module 1, a first end of the voltage acquisition unit 32 is connected to a connection node between the transformer unit 22 and the single-phase winding 4, and a second end of the voltage acquisition unit 32 is connected to the main control module 1.

[0050] During the test, when a test signal passes through the single-phase winding 4, the current acquisition unit 31 can detect the current passing through the single-phase winding 4, and acquire the current detection signal of the single-phase winding 4 under the test signal, and send the current detection signal to the main control module 1. At the same time, the voltage acquisition unit 32 can detect the voltage across the single-phase winding 4, and acquire the voltage detection signal of the single-phase winding 4 under the test signal, and send the voltage detection signal to the main control module 1. The main control module 1 can directly process the obtained voltage detection signal and current detection signal to calculate the resistance and inductance corresponding to the single-phase winding 4. If the resistance and inductance are within the preset range, the main control module 1 outputs another set of test signals with a higher voltage value to test the single-phase winding 4 until the voltage value corresponding to the test signal reaches the upper limit of the voltage value. If during the test process, under a certain set of test signals, the resistance and inductance corresponding to the single-phase winding 4 calculated by the main control module 1 are not within the preset range, it means that the single-phase winding 4 has an insulation problem. If during the test process, under each set of test signals, the resistance and inductance corresponding to the single-phase winding 4 calculated by the main control module 1 are within the preset range, it means that the single-phase winding 4 does not have an insulation problem. Alternatively, the main control module 1 can also transmit the obtained voltage detection signal and current detection signal to the host computer for processing. Specifically, the host computer can calculate and obtain the resistance and inductance corresponding to the single-phase winding 4 through the voltage detection signal and the current detection signal. If the resistance and inductance are within the preset range, the host computer continues to control the main control module 1 to output another set of test signals with a higher voltage value to test the single-phase winding 4 until the voltage value corresponding to the test signal reaches the voltage value upper limit. If during the test, under a certain set of test signals, the resistance and inductance corresponding to the single-phase winding 4 calculated by the host computer through the voltage detection signal and the current detection signal are not within the preset range, it means that the single-phase winding 4 has an insulation problem. If during the test, under each set of test signals, the resistance and inductance corresponding to the single-phase winding 4 calculated by the host computer are within the preset range, it means that the single-phase winding 4 does not have an insulation problem.

[0051] In one embodiment, the current acquisition unit 31 includes a current acquisition resistor R1; the first end of the current acquisition resistor R1 is connected to the secondary winding of the transformer unit 22, and the second end of the current acquisition resistor R1 is grounded; the main control module 1 is connected to the connection node between the current acquisition resistor R1 and the transformer unit 22.

[0052] As an example, the current acquisition unit 31 includes a current acquisition resistor R1. A first end of the current acquisition resistor R1 is connected to the secondary winding of the transformer unit 22, a second end of the current acquisition resistor R1 is grounded, and the main control module 1 is connected to a connection node between the current acquisition resistor R1 and the transformer unit 22. When the transformer unit 22 outputs a test signal to the single-phase winding 4, current flows through the current acquisition resistor R1, and the main control module 1 can indirectly obtain a current detection signal by obtaining a voltage across the current acquisition resistor R1.

[0053] In one embodiment, the voltage acquisition unit 32 includes a first voltage-dividing resistor R2 and a second voltage-dividing resistor R3; the first end of the first voltage-dividing resistor R2 is connected to a connection node between a transformer unit 22 and a single-phase winding 4, the second end of the first voltage-dividing resistor R2 is connected to the first end of the second voltage-dividing resistor R3, and the second end of the second voltage-dividing resistor R3 is grounded; the main control module 1 is connected to the second end of the first voltage-dividing resistor R2.

[0054] As an example, the voltage acquisition unit 32 includes a first voltage-dividing resistor R2 and a second voltage-dividing resistor R3. The first end of the first voltage-dividing resistor R2 is connected to a connection node between a transformer unit 22 and a single-phase winding 4, the second end of the first voltage-dividing resistor R2 is connected to the first end of the second voltage-dividing resistor R3, and the second end of the second voltage-dividing resistor R3 is grounded. When the transformer unit 22 outputs a test signal to the single-phase winding 4, the voltage applied across the first voltage-dividing resistor R2 and the second voltage-dividing resistor R3 is the same as the voltage on the single-phase winding 4, the main control module 1 is connected to the second end of the first voltage-dividing resistor R2, so that the voltage input to the main control module 1 is the same as the voltage across the second voltage-dividing resistor R3, and the main control module 1 can indirectly obtain the voltage on the single-phase winding 4 based on the voltage across the second voltage-dividing resistor R3.

[0055] In one embodiment, the signal acquisition module 3 also includes a first analog-to-digital conversion module 33 and a second analog-to-digital conversion module 34; the first analog-to-digital conversion module 33 is connected between the main control module 1 and the current acquisition unit 31, and is used to perform analog-to-digital conversion on the current detection signal; the second analog-to-digital conversion module 34 is connected between the main control module 1 and the voltage acquisition unit 32, and is used to perform analog-to-digital conversion on the voltage detection signal.

[0056] As an example, the signal acquisition module 3 also includes a first analog-to-digital conversion module 33 and a second analog-to-digital conversion module 34. The first analog-to-digital conversion module 33 is connected between the main control module 1 and the current acquisition unit 31, and the second analog-to-digital conversion module 34 is connected between the main control module 1 and the voltage acquisition unit 32. The first analog-to-digital conversion module 33 is used to convert the current detection signal in the analog signal state collected by the current acquisition unit 31 into a digital signal that can be processed by the main control module 1, and the second analog-to-digital conversion module 34 is used to convert the voltage detection signal in the analog signal state collected by the voltage acquisition unit 32 into a digital signal that can be processed by the main control module 1.

[0057] In one embodiment, the main control module 1 includes any one of a digital signal processor, a programmable gate array and a microcontroller.

[0058] As an example, the main control module 1 may include any one of a digital signal processor, a programmable gate array, and a microcontroller. The main control module 1 may directly control the signal output module 2 to output multiple groups of test signals to the single-phase winding 4 according to a preset scheme, and calculate the resistance and inductance corresponding to the single-phase winding 4 according to the feedback detection signal, so as to obtain the insulation test result of the single-phase winding 4. Alternatively, the main control module 1 may also communicate and transmit data with the host computer, and according to the host computer instruction, control the signal output module 2 to output multiple groups of test signals to the single-phase winding 4, and continue to transmit the feedback detection signal to the host computer for processing, so that the host computer can calculate the resistance and inductance corresponding to the single-phase winding 4 according to the detection signal, so as to obtain the insulation test result of the single-phase winding 4.

[0059] The embodiment of the utility model further provides an insulation detection device, comprising a housing and the insulation test circuit in the above embodiment arranged in the housing.

[0060] As an example, the insulation detection device includes the insulation test circuit in the above-mentioned example of the housing, and the insulation test circuit is arranged in the housing. The insulation test circuit can output multiple groups of test signals to the single-phase winding 4, and obtain the detection signal corresponding to the single-phase winding 4 under each group of test signals to determine the insulation detection results corresponding to the single-phase winding 4 under different test signals, and can form a margin test on the insulation of the single-phase winding 4 to prevent the winding from exposing insulation problems due to aging or changes in working conditions in actual work, and ensure that the insulation performance of the winding is good.

[0061] The embodiment of the utility model also provides an insulation testing system, including a host computer and the insulation testing device in the above embodiment; the host computer is connected to the main control module 1, and is used to send a test instruction to the main control module 1, so that the main control module 1 controls the signal output module 2 to output multiple groups of test signals to the single-phase winding 4, and receives the detection signals corresponding to the multiple groups of test signals output by the main control module 1, and determines the detection results corresponding to the single-phase winding 4 according to the detection signals.

[0062] As an example, an insulation test system includes a host computer and the insulation test device in the above example. The host computer is connected to the main control module 1, and is used to send a test instruction to the main control module 1, so that the main control module 1 controls the signal output module 2 to output multiple groups of test signals to the single-phase winding 4. During the test, when a test signal passes through the single-phase winding 4, the current acquisition unit 31 can detect the current passing through the single-phase winding 4, and collect the current detection signal of the single-phase winding 4 under the test signal, and send the current detection signal to the main control module 1. At the same time, the voltage acquisition unit 32 can detect the voltage at both ends of the single-phase winding 4, and collect the voltage detection signal of the single-phase winding 4 under the test signal, and send the voltage detection signal to the main control module 1. The main control module 1 transmits the obtained voltage detection signal and current detection signal to the host computer for processing. Specifically, the host computer can calculate and obtain the resistance and inductance corresponding to the single-phase winding 4 through the voltage detection signal and the current detection signal. If the resistance and inductance are within the preset range, the host computer continues to control the main control module 1 to output another set of test signals with higher voltage values ​​to test the single-phase winding 4 until the voltage value corresponding to the test signal reaches the upper voltage limit. If during the test, under a certain set of test signals, the resistance and inductance corresponding to the single-phase winding 4 calculated by the host computer through the voltage detection signal and the current detection signal are not within the preset range, it means that the single-phase winding 4 has an insulation problem. If during the test, under each set of test signals, the resistance and inductance corresponding to the single-phase winding 4 calculated by the host computer are within the preset range, it means that the single-phase winding 4 does not have an insulation problem. For example, when the insulation test system tests the single-phase winding 4 (for example, the R-phase winding), the host computer presets the nominal resistance value corresponding to the R-phase winding to R, and the designed preset resistance variation range is X%, then the preset range of resistance is , the nominal inductance corresponding to the R-phase winding is preset to L, and the preset inductance variation range is designed to be Y%, so the preset inductance range is , and preset the frequency of the test signal to be f, and the voltage value range of the test signal to be During the test, the signal output module 2 first outputs the output frequency f and the voltage value to the R phase winding. The test signal is As an example, at this moment, the voltage of the test signal output by the signal output module 2 to the R phase winding is ,in, is the total gain of the power amplifier unit 21 and the transformer unit 22, The sampling and output interval time (the inverse of the sampling frequency) of the digital-to-analog conversion module 23 and the analog-to-digital conversion module arranged between the signal acquisition module 3 and the main control module 1. The main control module 1 acquires the voltage acquired by the voltage acquisition unit 32 and the current acquired by the current acquisition unit 31 The data is transmitted to the host computer, which calculates the inductance and resistance based on the acquired data using Fourier series. Specifically, the voltage acquisition unit 32 acquires the acquired voltage. and the current acquired by the current acquisition unit 31 It can be expressed as:

[0063] ;

[0064] in is the fundamental wave part of the Fourier series of the R phase voltage, is the fundamental wave part of the Fourier series of the R phase current, is the imaginary part operator. According to the formula:

[0065] ;

[0066] The coil reactance can be obtained , further, the coil reactance It can be expressed as:

[0067] ;

[0068] in for The real part of ;

[0069] for The imaginary part of ;

[0070] for The real part of ;

[0071] for The imaginary part of .

[0072] Then the measured resistance value corresponding to the R phase winding is obtained by the following formula: :

[0073] ;

[0074] Then the measured inductance value corresponding to the R phase winding is obtained by the following formula: :

[0075] .

[0076] Furthermore, the host computer will measure the resistance value With the preset range of resistance For comparison, the measured inductance value With the preset range of inductance For comparison, if the measured resistance value and the measured inductance value If both are within the preset range, the host computer continues to control the main control module 1 to output another set of test signals with a higher voltage value to test the R phase winding until the voltage value corresponding to the test signal reaches the upper voltage value limit , when the test signal is from Upgrade to During the entire test process, if the resistance and inductance of the R-phase winding calculated by the host computer through the voltage detection signal and the current detection signal are not within the preset range under any set of test signals, it means that there is an insulation problem with the R-phase winding. Upgrade to During the entire test process, if the resistance and inductance corresponding to the R-phase winding calculated by the host computer are within the preset range, it means that there is no insulation problem with the R-phase winding.

[0077] In this example, the host computer can control the insulation test circuit to output multiple groups of test signals to the single-phase winding 4, and obtain the detection signal corresponding to the single-phase winding 4 under each group of test signals, so as to determine the insulation detection results corresponding to the single-phase winding 4 under different test signals, and can form a margin test on the insulation of the single-phase winding 4 to prevent the winding from exposing insulation problems due to aging or changes in working conditions in actual work, thereby ensuring that the insulation performance of the winding is good.

[0078] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. An insulation test circuit, characterized in that: It includes a main control module, a signal output module and a signal acquisition module; The signal output module is used to be connected to the single-phase winding and output multiple groups of test signals to the single-phase winding; The signal acquisition module is connected to the connection node between the signal output module and the single-phase winding, and is used to collect a detection signal corresponding to each test signal when the test signal passes through the single-phase winding; The main control module is connected to the signal output module and the signal acquisition module, and is used to control the signal output module to output multiple groups of test signals to the single-phase winding, and is also used to receive detection signals corresponding to the multiple groups of test signals output by the signal acquisition module.

2. The insulation test circuit according to claim 1, characterized in that: The signal output module includes a power amplification unit and a transformer unit; The main control module is connected to the first end of the power amplification unit and is used to output a first signal to the power amplification unit; The second end of the power amplifier unit is connected to the primary winding of the transformer unit, the secondary winding of the transformer unit is connected to the single-phase winding, the power amplifier unit is used to perform power amplification processing on the first signal and output a second signal to the transformer unit, and the transformer unit is used to perform voltage conversion on the second signal and output a test signal to the single-phase winding.

3. The insulation test circuit according to claim 2, characterized in that: The signal output module also includes a digital-to-analog conversion module; The digital-to-analog conversion module is connected between the main control module and the power amplification unit, and is used for performing digital-to-analog conversion on the signal output by the main control module.

4. The insulation test circuit according to claim 2, characterized in that: The signal acquisition module includes a current acquisition unit and a voltage acquisition unit; The first end of the current acquisition unit is connected to the secondary winding of the transformer unit, and the second end of the current acquisition unit is connected to the main control module, and is used to collect a current detection signal corresponding to each test signal when the test signal passes through the single-phase winding, and send the current detection signal to the main control module; The first end of the voltage acquisition unit is connected to a connection node between a transformer unit and a single-phase winding, and the second end of the voltage acquisition unit is connected to the main control module, and is used to collect a voltage detection signal corresponding to each test signal when the test signal passes through the single-phase winding, and send the voltage detection signal to the main control module.

5. The insulation test circuit according to claim 4, characterized in that: The current collection unit includes a current collection resistor; A first end of the current collection resistor is connected to the secondary winding of the transformer unit, and a second end of the current collection resistor is grounded; The main control module is connected to a connection node between the current collection resistor and the transformer unit.

6. The insulation test circuit according to claim 4, characterized in that: The voltage acquisition unit includes a first voltage-dividing resistor and a second voltage-dividing resistor; A first end of the first voltage-dividing resistor is connected to a connection node between a transformer unit and a single-phase winding, a second end of the first voltage-dividing resistor is connected to a first end of a second voltage-dividing resistor, and a second end of the second voltage-dividing resistor is grounded; The main control module is connected to the second end of the first voltage-dividing resistor.

7. The insulation test circuit according to claim 4, characterized in that: The signal acquisition module also includes a first analog-to-digital conversion module and a second analog-to-digital conversion module; The first analog-to-digital conversion module is connected between the main control module and the current acquisition unit, and is used to perform analog-to-digital conversion on the current detection signal; The second analog-to-digital conversion module is connected between the main control module and the voltage acquisition unit, and is used for performing analog-to-digital conversion on the voltage detection signal.

8. The insulation test circuit according to claim 1, characterized in that: The main control module includes any one of a digital signal processor, a programmable gate array and a microcontroller.

9. An insulation test device, characterized in that: The invention comprises a housing and the insulation test circuit according to any one of claims 1 to 8 arranged in the housing.

10. An insulation test system, characterized in that: It comprises a host computer and the insulation testing device according to claim 9; The host computer is connected to the main control module and is used to send a test instruction to the main control module so that the main control module controls the signal output module to output multiple groups of test signals to the single-phase winding, receives the detection signals corresponding to the multiple groups of test signals output by the main control module, and determines the detection results corresponding to the single-phase winding according to the detection signals.

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