Multi-physical environment simulation test system and method for electronic transformer

Abstract

The invention discloses an electronic mutual inductor multi-physical environment simulation test system, and relates to the field of electronic mutual inductor simulation test, the electronic mutual inductor multi-physical environment simulation test system comprises a first isolation transformer and a second isolation transformer, the first isolation transformer is electrically connected with a filter, and the second isolation transformer is electrically connected with a second isolation transformer. The filter is electrically connected with the generator unit, and the generator unit is connected with the environment simulation unit; the second isolation transformer is electrically connected with the signal generator, and the signal generator is connected with the environment simulation unit; the environment simulation unit is electrically connected with the report analyzer, and a device to be tested is placed in the environment simulation unit. Signals generated by the generators enter the coupling and decoupling network and are used for carrying out an anti-interference test on the tested equipment, different anti-interference tests are carried out through different generators in the process, meanwhile, different physical environments are provided through the temperature and humidity module, and the accuracy of the detection result of the electronic transformer can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of electronic transformer simulation testing, in particular to a multi-physical environment simulation testing system and method for an electronic transformer. Background Art

[0002] An electronic transformer is a sensor that converts current and voltage signals into voltage output. It consists of one or more voltage or current sensors connected to a transmission system and a secondary converter. It is used to transmit a quantity proportional to the measured quantity to supply measuring instruments, meters, and relay protection or control devices.

[0003] Electronic transformers are subjected to electromagnetic interference simulation tests before use. However, the main sources of electromagnetic interference include electrical fast transient pulse group (EFT / B), surge, and conducted immunity (CS) of radio frequency induction. The existing simulation test methods have the following disadvantages: 1. Due to the different electromagnetic interference sources, the test methods are different, resulting in the need to change different test methods when the electronic transformer is subjected to electromagnetic interference, which is cumbersome to operate; 2. Due to the temperature and humidity difference between the electronic transformer test environment and the use environment, the performance of the electronic transformer is different under different temperatures and humidities, resulting in errors in the performance detection of the electronic transformer; due to the difference between the test environment and the use environment, as well as factors such as the change of test methods and cumbersome operations, there may be cumulative errors in the test results, which may further affect the performance evaluation and fault diagnosis of the electronic transformer in the actual power grid. Summary of the invention

[0004] In view of the above problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is that the conventional simulation test method is complicated to change and operate when testing different items.

[0006] To solve the above technical problems, in a first aspect, the present invention provides the following technical solutions: an electronic transformer multi-physical environment simulation test system, comprising a first isolation transformer and a second isolation transformer, wherein the first isolation transformer is electrically connected to a filter, the filter is electrically connected to a generator unit, and the generator unit is connected to an environmental simulation unit; the second isolation transformer is electrically connected to a signal generator, and the signal generator is connected to the environmental simulation unit; the environmental simulation unit is electrically connected to a report analyzer, and the device to be tested is placed in the environmental simulation unit.

[0007] As a preferred solution of the electronic transformer multi-physical environment simulation test system of the present invention, wherein: the environment simulation unit includes a coupling and decoupling network unit and the coupling and decoupling network unit is electrically connected to the device to be tested.

[0008] As a preferred solution of the electronic transformer multi-physical environment simulation test system of the present invention, a decoupling clamp is further connected between the device to be tested and the signal generator.

[0009] As a preferred solution of the electronic transformer multi-physical environment simulation test system of the present invention, the generator unit includes a fast transient generator, a surge generator and a conduction generator.

[0010] As a preferred solution of the electronic transformer multi-physical environment simulation test system of the present invention, the coupling and decoupling network unit includes a fast content distribution module, a surge content distribution module and a conduction content distribution module.

[0011] As a preferred solution of the electronic mutual inductor multi-physical environment simulation test system of the present invention, the conduction generator includes a radio frequency mutual source, a variable attenuator, a radio frequency switch, a broadband power amplifier and a filter.

[0012] As a preferred solution of the electronic transformer multi-physical environment simulation test system of the present invention, the fast-transient generator is electrically connected to the phase line, the neutral line and the ground line of the fast-transient content distribution module through three capacitors respectively.

[0013] As a preferred solution of the multi-physical environment simulation test system for the electronic transformer described in the present invention, wherein: the surge generator is connected to the surge content distribution module through a line-to-line coupling test loop, its positive electrode is electrically connected to the phase line of the surge content distribution module, and its negative electrode is electrically connected to the neutral line of the surge content distribution module.

[0014] As a preferred solution of the multi-physical environment simulation test system for the electronic transformer of the present invention, wherein: the surge generator is electrically connected to the surge content distribution module through a line-ground coupling test loop, its positive pole is electrically connected to the phase line or neutral line of the surge content distribution module, and its negative pole is electrically connected to the ground line of the surge content distribution module.

[0015] On the other hand, the present invention also provides a multi-physical environment simulation test method for an electronic transformer, which is applicable to the above-mentioned multi-physical environment simulation test system for an electronic transformer, and the method includes connecting the device under test to the test system; adjusting the temperature and humidity parameters of the test environment through an environmental simulation unit; performing interference tests on the device under test; collecting data performance of the device under test in various interference tests, and then transmitting the data to a report analyzer to analyze and generate a detailed test report on the device's anti-interference capability and performance; evaluating the anti-interference performance of the device under test in a multi-physical environment based on the test report, and if the performance is found to be insufficient, adjusting the device or test conditions, and repeating the interference test to verify the improvement effect.

[0016] The beneficial effects of the present invention are as follows: the present invention realizes electrical isolation between the power supply and the user equipment through the isolation transformer, and the filter is used to improve the anti-interference performance and ensure the signal purity. The signal generated by the generator enters the coupling and decoupling network to perform an anti-interference test on the test equipment. In this process, different anti-interference tests are performed by different generators, and different physical environments are provided by the temperature and humidity module to improve the accuracy of the detection results of the electronic mutual inductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the structure of the multi-physical environment simulation test system for electronic transformers.

[0019] Figure 2 This is the circuit diagram of the fast generator.

[0020] Figure 3 It is a schematic diagram of the electrical connection between the instant content distribution module and the instant generator.

[0021] Figure 4 This is the circuit diagram of the surge generator.

[0022] Figure 5 Schematic diagram of line coupling between surge content distribution module and surge generator.

[0023] Figure 6 Schematic diagram of line-to-ground coupling between surge content distribution module and surge generator.

[0024] Figure 7 Schematic diagram of the conduction generator working process.

[0025] Figure 8 This is a circuit diagram for testing the instantaneous power line.

[0026] Fig. 9 This is the circuit diagram for the surge power line (line-ground coupling) test.

[0027] Fig.10 This is the test circuit diagram for the power line of conducted interference. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0031] Example 1

[0032] Reference Figure 1 , which is the first embodiment of the present invention, and provides an electronic transformer multi-physical environment simulation test system, the electronic transformer multi-physical environment simulation test system includes a first isolation transformer 100 and a second isolation transformer 200, the first isolation transformer 100 is electrically connected to the filter 300, the filter 300 is electrically connected to the generator unit 400, and the generator unit 400 is connected to the environment simulation unit 500;

[0033] The second isolation transformer 200 is electrically connected to the signal generator 600, and the signal generator 600 is connected to the environment simulation unit 500;

[0034] The environment simulation unit 500 is electrically connected to the report analyzer, and the device to be tested is placed in the environment simulation unit 500 .

[0035] The environment simulation unit 500 includes a coupling-decoupling network unit 501 and a device under test.

[0036] Specifically, the first isolation transformer 100 is electrically connected to the filter 300, the filter 300 is electrically connected to the generator unit 400, the coupling-decoupling network unit 501 and the device under test, the generator unit 400 is electrically connected to the coupling-decoupling network unit 501, and the coupling-decoupling network unit 501 is electrically connected to the device under test.

[0037] The second isolation transformer 200 is electrically connected to the signal generator 600 . A decoupling clamp 700 is provided between the signal generator 600 and the device under test. The device under test and the report analyzer 800 are electrically connected in sequence.

[0038] The first isolation transformer 100 and the second isolation transformer 200 are mainly used to achieve electrical isolation between the power supply and the user equipment, and provide a safe and reliable electrical environment.

[0039] The filter 300 is used to reduce the system sensitivity, improve the anti-interference ability of the system, separate the useful signal from the noise, and improve the anti-interference ability and signal-to-noise ratio of the signal.

[0040] The coupling-decoupling network unit 501 is used for the immunity test and cooperates with the generator to complete the immunity test of the device under test.

[0041] The decoupling clamp 700 is used to provide effective isolation between the device under test and the auxiliary device to prevent the test signal from interfering with the untested device or system.

[0042] The report analyzer 800 is responsible for analyzing the collected data and generating corresponding test reports.

[0043] The temperature and humidity module in the environment simulation unit 500 is used to provide a controllable temperature and humidity environment for simulating different working conditions.

[0044] In summary, the first isolation transformer 100 realizes electrical isolation between the power supply and the user equipment, and the filter 300 is used to improve the anti-interference performance and ensure the purity of the signal. The signal generated by the generator unit 400 enters the coupling decoupling network unit 501, which is used to perform an anti-interference test on the device under test. At the same time, the second isolation transformer 200 provides isolation for the signal generator 600 to ensure the purity of the test signal. The signal generated by the signal generator 600 is connected to the device under test after passing through the decoupling clamp 700 to avoid interference with the device not under test. The entire test process is carried out in the temperature and humidity module to simulate different working conditions to ensure the comprehensiveness and accuracy of the test results.

[0045] Example 2

[0046] Reference Figure 2 to Figure 10 , which is the second embodiment of the present invention, and is based on the previous embodiment. This embodiment specifically provides a generator unit 400 and a coupling-decoupling network unit 501, and in order to facilitate reliability verification of the above system, the device under test is replaced with a collector 900 and a merging unit 1000.

[0047] Specifically, the generator unit 400 includes a fast generator 401 , a surge generator 402 , and a conduction generator 403 .

[0048] The coupling-decoupling network unit 501 includes a transient content distribution module 501a, a surge content distribution module 501b and a conductive content distribution module 501c.

[0049] Better, refer to Figure 2The fast-instant generator 401 includes a high-voltage source U1, a charging resistor R11, a storage capacitor C11, a pulse duration adjustment resistor R13, an impedance matching resistor R12, a separation capacitor C12, and a high-voltage switch S1. The high-voltage source U1, the charging resistor R11, the high-voltage switch S1, the impedance matching resistor R12, and the separation capacitor C12 are connected in series, and the storage capacitor C11 and the pulse duration adjustment resistor R13 are connected in parallel.

[0050] The high voltage source U1 continuously charges the energy storage capacitor C11. When it reaches a certain voltage, the high voltage switch S1 is closed to release the voltage across the energy storage capacitor C11, forming the required fast transient pulse signal on the pulse duration adjustment resistor R13. The signal is output through the 50Ω coaxial through the impedance matching resistor R12 and the DC blocking capacitor C12.

[0051] Reference Figure 3 The fast instant generator 401 is electrically connected to the phase line L, the neutral line N and the ground line PE in the fast instant CDN through a plurality of coupling capacitors Ca.

[0052] See also Figure 8 , select 5 points at the temperature between 25 and 55°C (the humidity is maintained at 95% RH when the temperature rises and 80% when the temperature drops), and test the power line 100kHz±4kV and the signal line 100kHz±2kV fast transient tests respectively.

[0053] Table 1 Fast test reliability verification table

[0054]

[0055]

[0056] See also Figure 4 The surge generator 402 includes a high-voltage source U2, a charging resistor R21, a storage capacitor C21, a pulse duration adjustment resistor R23, a pulse duration adjustment resistor R24, an impedance matching resistor R22, a separation capacitor C12, and a high-voltage switch S1. The high-voltage source U1, the charging resistor R11, the high-voltage switch S1, and the inductor L2 formed by adjusting the rise time.

[0057] See also Figure 5 The surge generator can be electrically connected to the surge content distribution module 501b using a line-to-line coupling test loop, and electrically connected to the phase line L through a coupling capacitor Cb1. The negative electrode of the surge generator 402 is electrically connected to the neutral line N; the coupling capacitor Cb1 is selected to be 18uF.

[0058] See also Figure 6The surge generator 402 can be electrically connected to the surge content distribution module 501b using a line-to-ground coupling test loop. The positive electrode of the surge generator 402 is connected in series with a resistor Rb and a coupling capacitor Cb2, and can then be electrically connected to the phase line L or the neutral line N through a switch. The negative electrode of the surge generator 402 is electrically connected to the ground line PE.

[0059] See also Fig. 9 , take 5 temperature and humidity for testing during the process of alternating damp heat heating and cooling, and do several groups of tests at each temperature and humidity point: do 5 surge tests for each coupling mode and each polarity voltage (±0.5kV, ±1kV, ±2kV, ±4kV, ±6kV). (Since AC220V is used as the power supply, the phases are required: 0°, 90°, 180°, 270°)

[0060] Table 2 Surge test reliability verification table

[0061]

[0062] See also Figure 7 The conduction generator 403 includes a radio frequency mutual source, a variable attenuator, a radio frequency switch, a broadband power amplifier and a filter. The conduction generator 403 is electrically connected to the conduction content distribution module 501c through a fixed attenuator.

[0063] Among them, the RF mutual source is used to generate RF signals; the variable attenuator is used to adjust the attenuation value according to actual needs; the RF switch is used to control the on and off of the RF signal; the broadband power amplifier is used to enhance the power of the RF signal so that it can cover a longer distance or penetrate a thicker medium; the filter is used to select signals of a specific frequency and block interference from other frequencies; the fixed attenuator is used to provide a fixed signal attenuation.

[0064] The conduction generator 403 generates an RF signal through an RF mutual source, adjusts the signal power through variable and fixed attenuators, controls the signal on and off through an RF switch, enhances the signal power through a broadband power amplifier, and selects the required frequency through a filter. Finally, it is connected to the conduction content distribution module 501c through a fixed attenuator to achieve stable signal output.

[0065] See also Fig.10 , the test results are as follows:

[0066] Table 3 Conducted disturbance reliability verification table

[0067] temperature humidity Peak voltage Sweep parameters Coupling method Phenomenon 25 95、80 10V 150kHz~80MHz Power cord normal 31 95、80 10V 150kHz~80MHz Power cord normal 37 95、80 10V 150kHz~80MHz Power cord normal 43 95、80 10V 150kHz~80MHz Power cord normal 49 95、80 10V 150kHz~80MHz Power cord normal 55 95、80 10V 150kHz~80MHz Power cord normal

[0068] Example 3

[0069] This is the third embodiment of the present invention, which is based on the first two embodiments. This embodiment provides a multi-physical environment simulation test method for an electronic transformer, which is based on the test system in the first two embodiments. The method includes:

[0070] S1: Connect the device under test to the test system.

[0071] Specifically, first connect the first isolation transformer 100 to the filter 300 to ensure the integrity of signal transmission. Then, connect the filter 300 to the generator unit 400, the coupling decoupling network unit 501 and the device to be tested in sequence. The second isolation transformer 200 is connected to the signal generator 600, and a decoupling clamp 700 is set between the signal generator 600 and the collector 900 to reduce interference. Ensure that all electrical connections are reliable and meet design requirements. Finally, place the coupling decoupling network unit 501, the collector 900 and the device to be tested in the temperature and humidity module to ensure that the environmental conditions are controllable.

[0072] S2: Adjusting the temperature and humidity parameters of the test environment through the environment simulation unit 500.

[0073] Specifically, in the temperature and humidity module, the temperature and humidity are adjusted according to the test requirements to simulate the performance of the device under test under different environmental conditions. This step ensures the consistency of the test environment and affects the performance response of the device, especially when performing electromagnetic interference testing under high temperature and high humidity or low temperature and low humidity conditions.

[0074] S3: Perform interference test on the device under test.

[0075] S3-1: Perform a fast signal test.

[0076] A short-duration high-voltage pulse is generated by using a fast-transient generator 401 (which includes a high-voltage source, a charging resistor, an energy storage capacitor, etc.). The signal is connected to the phase line L, the neutral line N and the ground line PE of the fast-transient content distribution module 501a through a plurality of coupling capacitors (Ca), and the interference is applied to the device under test to record the transient response of the device.

[0077] S3-2: Perform surge signal test.

[0078] Using the surge generator 402, a line-to-line coupling and a line-to-ground coupling test loop can be used. The surge signal is applied to the device under test through the coupling capacitors (Cb1 and Cb2). The response of the device under different surge intensities and durations is recorded to evaluate its surge resistance capability.

[0079] S3-3: Perform a conducted signal test.

[0080] Use the conduction generator 403 (including RF mutual source, variable attenuator, etc.) connected to the conduction content distribution module 501c through the fixed attenuator to generate RF interference signals, apply them to the device under test, and evaluate its sensitivity to RF interference and anti-interference ability.

[0081] S4: Collect the performance data of the device under test in various interference tests, and then transmit the data to the report analyzer (800) to analyze and generate a detailed test report on the device's anti-interference ability and performance.

[0082] Specifically, during the interference test, the response data of the device under test is recorded in real time using the collector 900. The collector 900 is connected to the merging unit 1000, and after the data is merged, it is transmitted to the report analyzer 800 for analysis. The report analyzer 800 will generate a detailed test report containing the performance of the device under various interferences, recording various anti-interference indicators and response characteristics.

[0083] S5: Evaluate the anti-interference performance of the device under test in a multi-physical environment based on the test report. If the performance is found to be insufficient, adjust the device or test conditions and repeat the interference test to verify the improvement effect.

[0084] Specifically, the overall performance of the device under test in a multi-physical environment is evaluated by conducting a detailed analysis of the generated test report. If it is found that the performance of the device under certain interference conditions is not satisfactory, a targeted improvement plan is formulated, such as optimizing the design, adjusting the test conditions, etc. If necessary, the relevant tests are repeated to verify the improvement effect and ensure that the device can meet the performance requirements in actual applications.

[0085] In summary, the beneficial effects of the present invention are:

[0086] The present invention realizes electrical isolation between the power supply and the user equipment through an isolation transformer, and the filter is used to improve the anti-interference performance and ensure the signal purity. The signal generated by the generator enters the coupling and decoupling network to perform an anti-interference test on the tested equipment. In this process, different anti-interference tests are performed by different generators, and different physical environments are provided by the temperature and humidity module to improve the accuracy of the detection results of the electronic mutual inductor.

[0087] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An electronic transformer multi-physical environment simulation test system, characterized in that: include, A first isolation transformer (100) and a second isolation transformer (200), wherein the first isolation transformer (100) is electrically connected to a filter (300), the filter (300) is electrically connected to a generator unit (400), and the generator unit (400) is connected to an environment simulation unit (500); The second isolation transformer (200) is electrically connected to a signal generator (600), and the signal generator (600) is connected to the environment simulation unit (500); The environmental simulation unit (500) is electrically connected to the report analyzer, and the device to be tested is placed in the environmental simulation unit (500).

2. The multi-physical environment simulation test system for electronic transformers according to claim 1, characterized in that: The environmental simulation unit (500) comprises a coupling-decoupling network unit (501) and is electrically connected to the device under test.

3. The multi-physical environment simulation test system for electronic transformers according to claim 2, characterized in that: A decoupling clamp (700) is also connected between the device under test and the signal generator (600).

4. The multi-physical environment simulation test system for electronic transformers according to claim 3, characterized in that: The generator unit (400) includes a fast transient generator (401), a surge generator (402) and a conduction generator (403).

5. The multi-physical environment simulation test system for electronic transformers according to claim 4, characterized in that: The coupling-decoupling network unit (501) comprises a fast content distribution module (501a), a surge content distribution module (501b) and a conduction content distribution module (501c).

6. The multi-physical environment simulation test system for electronic transformers according to claim 5, characterized in that: The conduction generator (403) comprises a radio frequency mutual source, a variable attenuator, a radio frequency switch, and a broadband power amplifier.

7. The multi-physical environment simulation test system for electronic transformers according to claim 6, characterized in that: The instantaneous generator (401) is electrically connected to the phase line, the neutral line and the ground line of the instantaneous content distribution module (501a) respectively through three capacitors.

8. The multi-physical environment simulation test system for electronic transformers according to claim 7, characterized in that: The surge generator (402) is connected to the surge content distribution module (501b) via a line-to-line coupling test loop, with its positive electrode electrically connected to the phase line of the surge content distribution module (501b) and its negative electrode electrically connected to the neutral line of the surge content distribution module (501b).

9. The multi-physical environment simulation test system for electronic transformers according to claim 8, characterized in that: The surge generator (402) is electrically connected to the surge content distribution module (501b) via a line-ground coupling test loop, its positive electrode is electrically connected to the phase line or neutral line of the surge content distribution module (501b), and its negative electrode is electrically connected to the ground line of the surge content distribution module (501b).

10. A multi-physical environment simulation test method for an electronic transformer, characterized in that: Applicable to the electronic transformer multi-physical environment simulation test system as claimed in any one of claims 1 to 9, the method comprising: Connect the device under test to the test system; Adjusting the temperature and humidity parameters of the test environment through the environment simulation unit (500); Conduct interference test on the device under test; Collecting data performance of the device under test in various interference tests, and then transmitting the data to a report analyzer (800) to analyze and generate a detailed test report on the device's anti-interference capability and performance; Evaluate the anti-interference performance of the device under test in a multi-physical environment based on the test report. If the performance is found to be insufficient, adjust the device or test conditions and repeat the interference test to verify the improvement effect.

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