Switch equipment detection device and switch equipment detection system

Abstract

The utility model provides a switch equipment detection device and a switch equipment detection system. The switch equipment detection device comprises a voltage generation module, a large current generation module, a temperature detection module and an impedance detection module. The voltage generation module generates fundamental wave voltage or harmonic wave voltage, and the large current generation module converts the voltages of various waveforms into large currents respectively, so that the large currents are applied to the switch equipment. Then, the temperature detection module and the impedance detection module respectively detect the temperature influence and the impedance influence, and finally, whether the switch equipment can resist the influence of harmonic waves or not is judged based on the detection results of the temperature and the impedance. The adjustable harmonic voltage is generated to obtain the adjustable harmonic current, the influence trend of harmonic waves on the switch equipment is simulated through the test environment in combination with temperature and impedance detection, the influence of the harmonic current on the switch equipment is evaluated from multiple aspects, the structure of the detection device of the switch equipment is simplified, and meanwhile the detection efficiency is improved. And the detection precision of the switch equipment can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of equipment detection, and in particular to a switch equipment detection device and a switch equipment detection system. Background Art

[0002] Switchgear is an electrical device that connects or disconnects a circuit. It can include many types, such as circuit breakers or disconnectors. Switchgear is widely used in various power systems, industrial equipment, and household electricity scenarios to protect electrical equipment from faults. Switchgear plays an important role in power systems and electrical control, and the detection of switchgear is also a very important link. A qualified switchgear should have a certain resistance to harmonics and be able to work stably and reliably in a harmonic environment.

[0003] However, not all switching devices can completely resist the influence of harmonics. Therefore, in order to ensure the safe and stable operation of the system where the switching device is located, it is necessary to detect the influence of harmonic current on the switching device. In the prior art, a harmonic current generator is usually used to detect the performance of the switching device. When the harmonic current generator is working, the signal generator generates a baseband signal, which is transformed nonlinearly through nonlinear elements to generate harmonic components. Then, the filter filters out the non-harmonic components and only retains the required harmonic frequencies. Finally, the amplifier amplifies the amplitude of the harmonic signal to obtain the required harmonic current signal, and the control circuit changes the output harmonic frequency and amplitude by adjusting the corresponding parameters. The implementation method of using a harmonic current generator is relatively complex and costly. Therefore, the detection of switching devices in the prior art has the problems of complex structure and high cost. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a switch device detection device and a switch device detection system, so as to solve the problem that the detection of switch devices in the prior art has a complex structure and high cost.

[0005] In order to achieve the above-mentioned object, the first aspect of the present application provides a switch device detection device, including a voltage generation module, a large current generation module, a temperature detection module and an impedance detection module, wherein the voltage generation module is connected to the large current generation module, and the large current generation module, the temperature detection module and the impedance detection module are respectively connected to the switch device;

[0006] A voltage generating module, used for generating voltages of various waveforms, including fundamental voltage waveforms and harmonic voltage waveforms;

[0007] A high current generating module is used to convert voltages of various waveforms into corresponding high currents to obtain high currents of various waveforms, and apply the high currents of various waveforms to the switching device, wherein the high currents of various waveforms include fundamental current and harmonic current;

[0008] A temperature detection module is used to detect the contact temperature of the switchgear under various waveforms to determine the temperature effect of the harmonic current on the switchgear;

[0009] The impedance detection module is used to detect the impedance of the switching device under various waveforms to determine the impact of harmonic current on the impedance of the switching device.

[0010] In one embodiment of the present application, the voltage generating module includes a signal generator, the high current generating module includes an isolated low voltage high current generator, the output end of the signal generator is connected to the input end of the isolated low voltage high current generator, and the output end of the isolated low voltage high current generator forms a series loop with the switching device.

[0011] In one embodiment of the present application, the isolated low-voltage high-current generator is a transformer with a set turns ratio, the primary winding of the transformer is the input end of the isolated low-voltage high-current generator, the secondary winding of the transformer is the output end of the isolated low-voltage high-current generator, the primary winding is connected to the output end of the signal generator, and the secondary winding forms a series circuit with the switching device.

[0012] In one embodiment of the present application, the switch device includes one or more phases, each phase corresponds to a contact and a copper busbar; the contacts of the switch device are closed when current flows through, and are opened when no current flows through.

[0013] In one embodiment of the present application, when performing a single-phase test on a switching device, the phase to be tested of the switching device forms a series loop with the output end of the isolated low-voltage high-current generator.

[0014] In one embodiment of the present application, when performing a multi-phase test on a switching device, a plurality of phases to be tested of the switching device are first connected in series and then form a series loop with the output end of the isolated low-voltage high-current generator.

[0015] In one embodiment of the present application, the temperature detection module includes a thermocouple connected to a contact of a phase to be measured of the switch device.

[0016] In one embodiment of the present application, the impedance detection module includes an oscilloscope, which includes a voltage probe and a current probe; the voltage probe is respectively connected to the incoming and outgoing lines of the copper busbar of the phase to be tested of the switching device, and the current probe is connected to the outgoing line of the copper busbar of the phase to be tested of the switching device.

[0017] A second aspect of the present application provides a switch device detection system, comprising:

[0018] The switchgear detection device mentioned above;

[0019] A switchgear connected to the switchgear detection device;

[0020] The controller is connected to the switch device detection device and is used to send a detection signal to the switch device detection device and receive a detection result fed back by the switch device detection device.

[0021] In one embodiment of the present application, the system further includes:

[0022] The display device is connected to the controller and is used to receive setting information of the detection signal and display the detection result.

[0023] The present application connects a voltage generating module with a large current generating module, and the large current generating module, the temperature detecting module and the impedance detecting module are respectively connected to the switching device, thereby providing a switching device detection device with a simple structure. Among them, the voltage generating module generates a fundamental voltage or a harmonic voltage, and the large current generating module converts voltages of various waveforms into large currents respectively, thereby applying the large currents to the switching device. Then, the temperature detecting module and the impedance detecting module detect the temperature influence and the impedance influence respectively, and finally judge whether the switching device can resist the influence of harmonics based on the detection results of temperature and impedance. The present application generates an adjustable harmonic voltage to obtain an adjustable harmonic current, and combines the detection of temperature and impedance to simulate the influence trend of harmonics on the switching device through a test environment, so as to evaluate the influence of harmonic current on the switching device from multiple aspects, and simplifies the structure of the detection device of the switching device while improving the accuracy of the detection of the switching device.

[0024] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of the structure of a switch device detection device provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of the structure of a switch device detection device provided in a specific embodiment of the present application;

[0028] Figure 3A schematic diagram of a fundamental current waveform provided in a specific embodiment of the present application;

[0029] Figure 4 A schematic diagram of a copper busbar voltage drop waveform under fundamental wave detection provided in a specific embodiment of the present application;

[0030] Figure 5 A schematic diagram of a fundamental current amplitude provided in a specific embodiment of the present application;

[0031] Figure 6 A schematic diagram of a harmonic current waveform provided in a specific embodiment of the present application;

[0032] Figure 7 A schematic diagram of a copper busbar voltage drop waveform under harmonic detection provided in a specific embodiment of the present application;

[0033] Figure 8 A schematic diagram of a harmonic current amplitude provided in a specific embodiment of the present application;

[0034] Fig. 9 A schematic diagram of the structure of a switch device detection system provided in an embodiment of the present application.

[0035] Description of Reference Numerals

[0036] 100. Switching device detection device; 110. Voltage generating module; 111. Signal generator; 120. High current generating module; 121. Isolated low voltage high current generator; 130. Temperature detection module; 131. Thermocouple; 140. Impedance detection module; 141. Oscilloscope; 200. Switching device; 300. Controller; 400. Display device. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0038] In the description of the present application, it should be understood that the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In the present application, the word "exemplary" is used to mean "used as an example, illustration or description". Any embodiment described as "exemplary" in the present application is not necessarily interpreted as being more preferred or more advantageous than other embodiments. In order to enable any technician in the field to implement and use the present application, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can also be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the present application obscure. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.

[0039] In order to ensure the safe and stable operation of the system where the switchgear is located, it is necessary to detect the impact of harmonic current on the switchgear. In the prior art, a harmonic current generator is usually used to detect the performance of the switchgear, which is relatively complex and costly to implement. Therefore, the present application provides a switchgear detection device with a simpler structure and lower cost to detect the impact of harmonic current on the switchgear.

[0040] Figure 1 Schematic diagram of the structure of a switch device detection device 100 provided in an embodiment of the present application. Figure 1 As shown, the switching device detection device 100 may include a voltage generating module 110, a large current generating module 120, a temperature detection module 130 and an impedance detection module 140, the voltage generating module is connected to the large current generating module 120, and the large current generating module 120, the temperature detection module 130 and the impedance detection module 140 are respectively connected to the switching device 200.

[0041] In an embodiment of the present application, the voltage generating module 110 is used to generate voltages of various waveforms, which waveforms may include fundamental voltage waveforms and harmonic voltage waveforms; the large current generating module 120 is used to convert voltages of various waveforms into corresponding large currents, respectively, to obtain large currents of various waveforms, and apply the large currents of various waveforms to the switching device 200, respectively, and the large currents of various waveforms include fundamental current and harmonic current; the temperature detection module 130 is used to detect the contact temperature of the switching device 200 under various waveforms to determine the temperature influence of the harmonic current on the switching device 200; the impedance detection module 140 is used to detect the impedance of the switching device under various waveforms to determine the impedance influence of the harmonic current on the switching device 200.

[0042] In the embodiment of the present application, the switch device 200 may be an electrical device such as a circuit breaker or an isolating switch that can connect or disconnect a circuit. Harmonic detection of the switch device 200 requires a high current environment. Therefore, the embodiment of the present application provides a high current input to the switch device 200 through a combination of a voltage generating module 110 and a high current generating module 120. Among them, a high current refers to a current greater than a certain threshold. For example, a current greater than 100A can be called a high current. The specific threshold can be set according to actual detection needs. This embodiment does not limit the specific threshold.

[0043] The voltage generating module 110 is connected to the large current generating module 120, and the generated voltage can be injected into the large current generating module 120. The voltage generating module 110 can generate voltages of various waveforms and the amplitude of the voltage is adjustable. Among them, the various waveforms can be fundamental voltage waveforms and harmonic voltage waveforms. The fundamental voltage waveform refers to the waveform with the lowest component in the periodic signal. In the AC circuit, the sine wave is usually considered to be the fundamental voltage waveform. Harmonics refer to periodic fluctuations with frequencies that are integer multiples of the fundamental wave, and have a fixed frequency multiplication relationship with the fundamental frequency, such as second harmonics, third harmonics, etc., which correspond to 2 times and 3 times the fundamental frequency, respectively. A harmonic voltage waveform refers to a voltage waveform containing fundamental and harmonic components. In an AC circuit, in addition to the fundamental wave, it usually also contains some high-frequency harmonic components. Therefore, the harmonic voltage waveform can be a voltage waveform superimposed by the fundamental voltage and harmonic voltage. In one example, the voltage generating module 110 can generate a fundamental voltage, the amplitude of which can range from 0V to 220V, and the fundamental voltage waveform can be a 50Hz sine wave; the voltage generating module 110 can also generate a harmonic voltage, for example, a third harmonic voltage, with a frequency of 150Hz, then the harmonic voltage waveform is a superimposed waveform including the fundamental voltage (50Hz) and the third harmonic voltage (150Hz), and the amplitude can also be adjusted in the range of 0-220V.

[0044] The high current generating module 120 can receive voltages of various waveforms sent by the voltage generating module 110, and convert the voltages into high currents that can be applied to the switching device 200. In one example, the high current generator 120 can receive the fundamental voltage and harmonic voltage sent by the voltage generating module 110, and convert them into corresponding fundamental currents and harmonic currents. Through the conversion of the high current generating module 120, on the one hand, high currents of different waveforms can be provided to the switching device 200; on the other hand, the influence of harmonic currents on the switching device 200 can also be detected based on the high currents of multiple waveforms, and the parameters such as the waveform and amplitude of the aforementioned high current can be directly adjusted by the voltage generating module 110, which has a simple structure and high efficiency.

[0045] The influence of harmonic current on the switch device 200 mainly involves two aspects: current and heat. Therefore, in the embodiment of the present application, the influence of harmonic current on the switch device 200 can be evaluated from two aspects: temperature and impedance. Based on this, the embodiment of the present application collects data on the switch device 200 through which the current of different waveforms passes through by the temperature detection module 130 and the impedance detection module 140, and judges the influence of harmonic current on the temperature and impedance of the switch device 200 according to the detection results. Among them, the temperature detection module 130 is used to detect the contact temperature of the switch device 200 under various waveforms to determine the temperature influence of the harmonic current on the switch device 200. The temperature detection module 130 may include but is not limited to devices that can detect temperature, such as thermocouples, infrared thermal imagers, and infrared thermometers. Compared with other devices, thermocouples have higher measurement accuracy and faster response speed, especially in a higher temperature range, and their accuracy is higher. The impedance detection module 140 is used to detect the impedance of the switch device under various waveforms to determine the impedance influence of the harmonic current on the switch device 200. The impedance detection module 140 may include but is not limited to an oscilloscope, a multimeter, a digital voltmeter, a current clamp meter, etc. Compared with other devices, an oscilloscope can convert electrical signals into visual waveforms, which is helpful for signal analysis and has higher accuracy.

[0046] In one example, by comparing the temperature detection result and impedance detection result corresponding to the fundamental current with the temperature detection result and impedance detection result corresponding to the harmonic current, the impedance change and temperature rise are monitored to determine the influence of the harmonic current on the switch device 200 to be tested. For example, if there is no significant change in the impedance change and temperature rise under the fundamental current and the harmonic current before and after the harmonic current is applied, that is, both are within the set range, it can be determined that the harmonic current has no influence on the switch device 200 to be tested. Otherwise, if there is a significant change in the impedance change and temperature rise under the fundamental current and the harmonic current, that is, it exceeds the set range, it can be determined that the harmonic current has an influence on the switch device 200 to be tested, and then it can be determined that the current switch device 200 to be tested is unqualified. For example, if the contact temperature rise does not exceed 50°C and the impedance increase value does not exceed 50% of the original impedance, it means that the harmonic current has no influence on the switch device 200.

[0047] In the embodiment of the present application, the voltage generating module 110 generates a fundamental wave or harmonic voltage, and the high current generating module 120 converts voltages of various waveforms into high currents, thereby applying the high currents to the switching device 200. Then, the temperature detection module 130 and the impedance detection module 140 detect the temperature influence and the impedance influence, respectively, so as to judge whether the switching device can resist the influence of harmonics based on the detection results of temperature and impedance. In this way, by generating an adjustable harmonic voltage to obtain an adjustable harmonic current, the influence trend of harmonics on the switching device is simulated through the test environment in combination with the detection of temperature and impedance, so as to evaluate the influence of harmonic current on the switching device from multiple aspects, and at the same time simplifying the structure of the detection device of the switching device, the accuracy of the detection of the switching device can also be improved.

[0048] The switch device detection device is described below by assuming that the voltage generation module 110 includes a signal generator and the high current generation module 120 includes an isolated low voltage high current generator.

[0049] like Figure 2 , which is a schematic diagram of the structure of a switch device detection device provided by a specific embodiment of the present application. In the embodiment of the present application, the voltage generating module 110 may include a signal generator 111, and the high current generating module 120 includes an isolated low voltage high current generator 121, the output end of the signal generator 111 is connected to the input end of the isolated low voltage high current generator 121, and the output end of the isolated low voltage high current generator 121 forms a series loop with the switch device 200.

[0050] In the embodiment of the present application, the voltage generating module 110 can use the signal generator 111 to generate the fundamental voltage and the harmonic voltage. The signal generator 111 can generate different types of electrical signals and can adjust the parameters such as signal amplitude, frequency, phase, etc., and has the advantages of high precision, multi-function, convenient adjustment and high degree of automation. The signal generator 111 can use digital or analog technology to generate a voltage signal, so as to output the voltage according to the user's settings. For the fundamental voltage, the signal generator 111 can be realized by generating a basic signal waveform with a specific frequency and amplitude, such as generating a standard sine wave voltage of 50Hz, and the amplitude is adjustable. For the harmonic voltage, the signal generator 111 can add a harmonic component with a specific frequency and amplitude to the output signal to generate a harmonic voltage. For example, by configuring the third harmonic content to 70%, a harmonic voltage waveform with a fundamental voltage of 100% amplitude and a third harmonic voltage of 70% amplitude can be obtained. By generating the fundamental voltage and harmonic voltage through the signal generator 111, the output voltage can be flexibly adjusted to flexibly adjust the accuracy of the harmonic current.

[0051] In an embodiment of the present application, the high current generating module 120 can use an isolated low-voltage high current generator 121 to convert voltages of various waveforms sent by the signal generator 111 to obtain high currents of various waveforms. The isolated low-voltage high current generator 121 is a generator that provides electrical isolation and can output a relatively large current. It has good electrical isolation performance, prevents electrical interference and safety issues, and can meet the power supply requirements of high-power switching devices, thereby improving the stability and safety of the circuit. The isolated low-voltage high current generator 121 is connected in series with the switching device 200 to form a series loop, so that high currents of various waveforms can pass through the switching device 200, thereby providing a test environment for the switching device 200.

[0052] The isolated low-voltage high-current generator 121 usually includes a transformer. According to the inductive coupling principle of the transformer, the conversion from the input low voltage to the output high current can be achieved through the transformer's transformation ratio. In the embodiment of the present application, the isolated low-voltage high-current generator 121 is taken as a transformer with a set turns ratio as an example. The primary winding of the transformer is the input end of the isolated low-voltage high-current generator 121, and the secondary winding of the transformer is the output end of the isolated low-voltage high-current generator 121. The primary winding is connected to the output end of the signal generator 111, and the secondary winding forms a series loop with the switching device 200. Among them, the set turns ratio refers to the coil turns ratio of the primary winding and the secondary winding that can convert the input voltage into a large voltage. For example, assuming that the set turns ratio is 220:1, the effective value of the voltage of the primary winding is 220V, the current of the primary winding is 4A, and if the voltage drop is 1V after the secondary winding is short-circuited, the secondary winding can theoretically generate a fundamental current of 880A. Due to the loss, the output current of the secondary winding is not completely equal to the transformation ratio of the input current of the primary winding. The actual output current depends on the contact impedance. Since the impedance is small, the current can reach a very large value, that is, a corresponding large current is obtained. The closing impedance of the switch device 200 is very low. When the switch device 200 is connected to the output end of the isolated low-voltage large current generator 121, the isolated low-voltage large current generator 121 can still realize the function of converting voltage into large current. The large harmonic current test of the switch device 200 can be realized by using a simple combination of the signal generator 111 and the isolated low-voltage large current generator 121, which has a simple structure, low cost and high detection efficiency.

[0053] In an embodiment of the present application, the switch device 200 may include one or more phases, each phase corresponding to a contact and a copper busbar; the contacts of the switch device 200 are closed when current passes through, and are opened when no current passes through.

[0054] Single-phase switchgear and multi-phase switchgear are two common types of switchgear, which bear the function of controlling and protecting circuits. Single-phase switchgear is used for single-phase circuits, which only contain one phase line and one neutral line. Multi-phase switchgear is used for multi-phase circuits, that is, circuits containing more than two phase lines. In the embodiment of the present application, the switchgear 200 can be a single-phase switchgear or a multi-phase switchgear, so the switchgear 200 can include one or more phases. Each phase of the switchgear 200 corresponds to a contact and a copper busbar. The contact refers to a component used for electrical connection or disconnection in the switchgear 200, which plays a role in controlling the on and off of the circuit; the copper busbar is a conductive element with the advantages of good conductivity, excellent heat dissipation and easy installation, and is usually used for the transmission and distribution of large currents, thereby connecting electrical appliances and equipment. When current passes through the contacts, the contacts are closed, and a low-impedance path is formed between the contacts, so that a large current flows between the contacts. When there is no current passing, the contacts are disconnected, and a high-impedance isolation is formed between the contacts to prevent current from passing, which can achieve the function of circuit disconnection or isolation.

[0055] In the embodiment of the present application, the output end of the isolated low-voltage high-current generator 121 may include a phase line L and a neutral line N, the phase line L carries the forward transmission of the current, and the neutral line N provides a path for loop power supply. The input end of the switch device 200 is connected to the phase line L, and the output end is connected to the neutral line N, thereby forming a series loop with the isolated low-voltage high-current generator 121. In the series loop, the switch device 200 can perform both single-phase testing and multi-phase testing.

[0056] The single-phase test is a test for a single-phase circuit or a single electrical device, with only one phase current and one phase voltage, and this phase is the phase to be tested. Therefore, when performing a single-phase test on the switch device 200, the phase to be tested of the switch device 200 forms a series loop with the output end of the isolated low-voltage high-current generator 121. In one example, the phase line of the isolated low-voltage high-current generator 121 can be connected to the input end of the switch device 200, and the neutral line of the isolated low-voltage high-current generator 121 can be connected to the ground end of the switch device 200. In this way, after the isolated low-voltage high-current generator 121 generates a high current, the current passes from the phase line L through the phase to be tested and then returns to the neutral line, completing the single-phase test.

[0057] Multiphase testing is a test for multiphase circuits or multiple electrical devices, including multiple phases to be tested. Therefore, when performing a multiphase test on the switch device 200, since the transformer includes a phase line L and a neutral line N, the multiple phases to be tested of the switch device 200 need to be connected in series first, and then form a series loop with the output end of the isolated low-voltage high-current generator 121. Taking the three-phase test as an example, the switch device 200 includes three phases, each corresponding to a contact and a copper bus. The three phases of the switch device 200 are connected in series in sequence, and the input end after series connection is connected to the phase line L of the isolated low-voltage high-current generator 121, and the output end after series connection is connected to the neutral line N of the isolated low-voltage high-current generator 121. In this way, after the isolated low-voltage high-current generator 121 generates a large current, the current passes through the three phases to be tested from the phase line L in sequence, and then returns to the neutral line N, completing the three-phase test.

[0058] The structure of the embodiment of the present application can not only perform single-phase testing on the switch device 200, but also perform multi-phase testing on the switch device 200. It can be applied to various types of switch devices 200, has a wide range of applications and high flexibility.

[0059] In the embodiment of the present application, the temperature detection module 130 may include a thermocouple 131, which is connected to the contact of the phase to be measured of the switch device 200. The thermocouple 131 is a sensor for measuring temperature, which uses the thermoelectric effect to detect temperature and is composed of two wires of different metals or alloys. When the connection points of the two metals are at different temperatures, an electromotive force caused by the temperature difference will be generated, and the magnitude of the electromotive force is proportional to the temperature difference, thereby determining the temperature value. The thermocouple 131 has the characteristics of a wide temperature measurement range, fast response time, high temperature resistance and simple structure. The thermocouple 131 is connected to the contact of the phase to be measured, and the temperature of the switch device 200 under the influence of the current large current can be detected. Specifically, the thermocouple 131 is close to the contact of the phase to be measured, and the contact temperature is read until the temperature does not change within a certain period of time, for example, the temperature does not change within 10 minutes, and the temperature of the switch device 200 is recorded. It should be noted that the temperature detection module 130 can also use other devices to detect the temperature, thereby realizing the recording of the temperature rise of the switch device 200.

[0060] In an embodiment of the present application, the impedance detection module 140 may include an oscilloscope 141. The oscilloscope 141 is an instrument for displaying voltage changes over time, and is used to detect and observe electrical signals in a circuit. The oscilloscope 141 may include a voltage probe and a current probe, which are used to detect voltage and current, respectively. The voltage probes are respectively connected to the inlet and outlet of the copper busbar of the phase to be tested of the switch device 200, and the voltage detection result is obtained by observing the waveform of the voltage signal, such as amplitude, frequency, phase, etc. The current probe is connected to the outlet of the copper busbar of the phase to be tested of the switch device 200, and the information such as the magnitude and waveform characteristics of the current is obtained by observing the waveform of the current signal, thereby obtaining the current detection result. Based on the voltage waveform and the current waveform, the impedance of the copper busbar under the current electrical signal can be obtained. The voltage and current are detected by the oscilloscope 141 to obtain the impedance detection result, without the need for multiple detection equipment, the structure is simple and efficient, and the detection result is more intuitive.

[0061] The following is a detailed description of a testing process of a specific embodiment based on the structure of the switching device detection device.

[0062] In a specific embodiment of the present application, the detection of the switch device may include the following steps.

[0063] S1. The signal generator 111 generates a fundamental voltage, the waveform of which is a fundamental voltage waveform. The fundamental voltage waveform does not contain harmonic components, the frequency is a 50Hz sine wave, the amplitude is adjustable, and the amplitude range is 0-220V.

[0064] S2. The fundamental voltage is input to the input end of the isolated low-voltage high-current generator 121, and the phase to be tested of the switching device 200 is connected in series to the output end of the isolated low-voltage high-current generator 121. At this time, the output end impedance of the isolated low-voltage high-current generator 121 is low, and a fundamental current will flow through the copper busbar. The waveform is the fundamental current waveform, and the amplitude is theoretically equal to the input voltage / copper busbar voltage drop*input current.

[0065] S3. Connect the voltage probe grounding clamp of the oscilloscope 141 to the copper busbar inlet of the phase to be tested, and connect the voltage probe of the oscilloscope 141 to the copper busbar outlet of the phase to be tested, so that the voltage waveform can be measured by the voltage probe, and the current waveform can be measured by the current probe, thereby obtaining the impedance of the copper busbar of the switchgear 200 under the fundamental current. In addition, place the thermocouple 131 close to the contact of the phase to be tested until the temperature does not change within 2 hours, and record the temperature rise.

[0066] S4, repeat S1-S3, adjust the waveform generated by the signal generator 111 to a harmonic voltage waveform containing harmonic components, the harmonic voltage waveform is a waveform superimposed by a fundamental voltage (frequency is 50 Hz) and a third harmonic voltage (frequency is 150 Hz), the amplitude is adjustable, and the amplitude range is 0-220V.

[0067] S5. Determine the copper busbar impedance and temperature rise of the switch device 200 under the influence of the harmonic current, and compare them with the impedance and temperature rise measured under the fundamental wave condition to obtain the influence of the harmonic current on the switch device 200.

[0068] Based on the above steps, Figures 3 to 6 The test results corresponding to the exemplary test process are given. Figure 3 A schematic diagram of a fundamental current waveform provided in a specific embodiment of the present application; Figure 4 A schematic diagram of a copper busbar voltage drop waveform under fundamental wave detection provided in a specific embodiment of the present application; Figure 5 A schematic diagram of a fundamental current amplitude provided in a specific embodiment of the present application; Figure 6 A schematic diagram of a harmonic current waveform provided in a specific embodiment of the present application; Figure 7 A schematic diagram of a copper busbar voltage drop waveform under harmonic detection provided in a specific embodiment of the present application; Figure 8 A schematic diagram of a harmonic current amplitude provided in a specific embodiment of the present application.

[0069] like Figures 3 to 5 As shown, the signal generator 111 generates a fundamental voltage, the waveform is a fundamental voltage waveform, the amplitude is 25V, and the waveform of the output end of the isolated low-voltage high-current generator 121 is a fundamental current, with a peak value of 400A. After two hours of continuous power-on, the temperature of the copper bar no longer changes. At this time, the room temperature is 19°C, the temperature of the copper bar is 38°C, the voltage drop of the copper bar is 33.75mV, the impedance of the copper bar is 33.75mV / 400A=0.084mΩ, and the FFT fundamental current effective value is 268.75A.

[0070] like Figures 6 to 8 As shown, the signal generator 111 is adjusted to a harmonic voltage containing harmonic components, and the harmonic voltage waveform is a waveform of the fundamental voltage (frequency is 50 Hz) and the third harmonic (frequency is 150 Hz) superimposed, with a peak value of 362.5 A. After continuous power-on for 2 hours, the copper bar temperature no longer changes. At this time, the room temperature is 19°C, the copper bar temperature is 46°C, the copper bar voltage drop is 40mV, the copper bar impedance is 40mV / 362.5A=0.110mΩ, the FFT fundamental effective value is 200.32A, and the third harmonic current effective value is 112.68A.

[0071] Based on the above test results, when the fundamental current is applied, the contact temperature is 38°C and the copper bar impedance is 0.084mΩ; when the harmonic current is applied, the contact temperature is 46°C and the copper bar impedance is 0.110mΩ. Therefore, the harmonic current only causes an 8°C temperature rise and a 31% impedance rise, indicating that the harmonic current has no effect on the current switch device 200.

[0072] Fig. 9This is a schematic diagram of the structure of a switch device detection system provided in an embodiment of the present application. Fig. 9 As shown, the embodiment of the present application provides a switch device detection system, which may include the above-mentioned switch device detection device 100, switch device 200, controller 300 and display device 400. Among them, the switch device detection device 100 is connected to the switch device 200 and the controller 300 respectively, and the controller 300 is connected to the display device 400. The controller 300 is used to send a detection signal to the switch device detection device 100, and receive the detection result fed back by the switch device detection device 100; the display device 400 is used to receive the setting information of the detection signal and display the detection result.

[0073] In an embodiment of the present application, a switch device detection system including a switch device detection device can also be provided to realize automatic detection of the switch device, thereby saving labor costs, improving the detection efficiency of the switch device, and improving the accuracy of the switch device detection. By setting the detection process in the controller 300, for example, setting a set of detection timings in advance, and adjusting the voltage signal output by the signal generator 111 according to the detection timings, the automatic detection of the switch device 200 is completed. In addition, by adding a display device 400, the detection process and detection results of the controller 300 can be displayed on the display device 400, and the detection timing and parameters of the controller 300 can also be set according to the setting information input by the user. In this way, not only can the automatic detection of the switch device 200 be realized, but also the parameters can be flexibly adjusted according to user needs, thereby improving the efficiency, accuracy and breadth of the switch device detection.

[0074] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0075] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A switchgear detection device, characterized in that: It includes a voltage generation module, a large current generation module, a temperature detection module and an impedance detection module, wherein the voltage generation module is connected to the large current generation module, and the large current generation module, the temperature detection module and the impedance detection module are respectively connected to the switch device; The voltage generating module is used to generate voltages of various waveforms, including fundamental voltage waveforms and harmonic voltage waveforms; The large current generating module is used to convert the voltages of the multiple waveforms into corresponding large currents respectively to obtain large currents of multiple waveforms, and apply the large currents of the multiple waveforms to the switching device respectively, wherein the large currents of the multiple waveforms include fundamental current and harmonic current; The temperature detection module is used to detect the contact temperature of the switch device under the multiple waveforms to determine the temperature impact of the harmonic current on the switch device; The impedance detection module is used to detect the impedance of the switching device under various waveforms to determine the influence of the harmonic current on the impedance of the switching device.

2. The switchgear detection device according to claim 1, characterized in that: The voltage generating module includes a signal generator, and the high current generating module includes an isolated low voltage high current generator. The output end of the signal generator is connected to the input end of the isolated low voltage high current generator, and the output end of the isolated low voltage high current generator forms a series loop with the switching device.

3. The switchgear detection device according to claim 2, characterized in that: The isolated low-voltage high-current generator is a transformer with a set turns ratio, the primary winding of the transformer is the input end of the isolated low-voltage high-current generator, the secondary winding of the transformer is the output end of the isolated low-voltage high-current generator, the primary winding is connected to the output end of the signal generator, and the secondary winding forms a series loop with the switching device.

4. The switchgear detection device according to claim 2, characterized in that: The switch device comprises one or more phases, each phase corresponds to a contact and a copper busbar; the contacts of the switch device are closed when current flows through, and are opened when no current flows through.

5. The switchgear detection device according to claim 4, characterized in that: When performing a single-phase test on the switch device, the phase to be tested of the switch device forms a series loop with the output end of the isolated low-voltage high-current generator.

6. The switchgear detection device according to claim 4, characterized in that: When performing a multi-phase test on the switch device, a plurality of phases to be tested of the switch device are first connected in series and then form a series loop with the output end of the isolated low-voltage high-current generator.

7. The switchgear detection device according to claim 4, characterized in that: The temperature detection module comprises a thermocouple, and the thermocouple is connected to the contact of the phase to be measured of the switch device.

8. The switchgear detection device according to claim 4, characterized in that: The impedance detection module includes an oscilloscope, which includes a voltage probe and a current probe; the voltage probe is respectively connected to the incoming and outgoing lines of the copper busbar of the phase to be tested of the switching device, and the current probe is connected to the outgoing line of the copper busbar of the phase to be tested of the switching device.

9. A switchgear detection system, characterized in that: include: The switchgear detection device according to any one of claims 1 to 8; a switch device connected to the switch device detection device; The controller is connected to the switch device detection device and is used to send a detection signal to the switch device detection device and receive a detection result fed back by the switch device detection device.

10. The switchgear detection system according to claim 9, characterized in that: The system further comprises: The display device is connected to the controller and is used to receive setting information of the detection signal and display the detection result.

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