CN211928080U - Testing device - Google Patents
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- CN211928080U CN211928080U CN202020222511.9U CN202020222511U CN211928080U CN 211928080 U CN211928080 U CN 211928080U CN 202020222511 U CN202020222511 U CN 202020222511U CN 211928080 U CN211928080 U CN 211928080U
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Abstract
The utility model relates to a testing arrangement for carry out the partial discharge test to the condenser among the capacitive voltage transformer, the device includes: a voltage regulator; a transformer including a primary side coil and a secondary side coil; the voltage division unit comprises a first voltage divider and a second voltage divider; and the test loop comprises a first detection impedance unit, a second detection impedance unit, a public line and a partial discharge tester, wherein the first detection impedance unit processes the voltage signal of the second end of the first tested capacitor, so that the phase of an interference signal in the signal output by the second end of the first detection impedance unit is rotated by 180 degrees relative to the phase of an interference signal in the signal output by the second end of the second detection impedance unit. Therefore, the problem of low measurement sensitivity in the prior art is solved.
Description
Technical Field
The utility model relates to an electrical facility field particularly, relates to testing arrangement for carry out the partial discharge test to the condenser among the capacitive voltage transformer.
Background
The power capacitor can improve the voltage quality of a power system and improve the power transmission capacity of a power transmission line, and is an important device in the power system. However, since the high voltage capacitor has defects inevitably in some products due to process conditions, production environments, quality of insulating media, and the like. The breakdown due to partial discharge is a main cause of shortening of the insulation life of the high-voltage capacitor. For example, due to the fact that the electric field distribution is not uniform at some parts of the high-voltage capacitor caused by unreasonable design structure or poor process, the possibility of partial discharge inside the high-voltage capacitor is greatly increased due to overhigh local field intensity. Such partial discharge will lead to a gradual increase in the deterioration of the insulation of the high-voltage capacitor over time, eventually possibly causing the entire insulation to break down.
At present, manufacturers of high-voltage capacitors perform partial discharge detection when the capacitors are shipped out, so that the possibility of accidents occurring after the capacitor products are put into operation is reduced or avoided. In general, a partial discharge test is performed on a single capacitor, and due to the large size of the single capacitor, background noise (a signal detected in the partial discharge test and not generated from a test article is referred to as "background noise") is generally 17pC or higher. This background noise does not satisfy the standard requirement (national detection standard: background noise is less than 5pC), and therefore, the sensitivity and accuracy of partial discharge detection performed in this case are lowered.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a testing device, which can perform partial discharge testing on the capacitor of the capacitor voltage transformer, thereby solving the problem of low accuracy of the partial discharge testing device of the capacitor voltage transformer in the prior art.
In order to achieve the above object, according to an aspect of the present invention, there is provided a testing apparatus for performing a partial discharge test on a capacitor in a capacitor voltage transformer, the capacitor including a first capacitor under test, a second capacitor under test, the testing apparatus comprising: a voltage regulator; the transformer comprises a primary side coil and a secondary side coil, a first output end of the voltage regulator is connected to a first input end of the primary side coil, and a second output end of the voltage regulator is connected to a second input end of the primary side coil; the voltage division unit comprises a first voltage divider and a second voltage divider, wherein the first end of the first voltage divider, the first end of the first capacitor to be tested and the first end of the second capacitor to be tested are connected to a common connection point, the first output end of the secondary side coil is connected to the common connection point, the second output end of the secondary side coil is connected to the second end of the second voltage divider, and the second end of the first voltage divider is connected with the first end of the second voltage divider; the test loop comprises a first detection impedance unit, a second detection impedance unit, a common line and a partial discharge tester, wherein a voltage signal of a second end of a first tested capacitor is input to a first end of the first detection impedance unit, a voltage signal of a second end of a second tested capacitor is input to a first end of the second detection impedance unit, a second end of the first detection impedance unit and a second end of the second detection impedance unit are connected to an input end of the partial discharge tester through the common line, and the first detection impedance unit processes the voltage signal of the second end of the first tested capacitor, so that the phase of an interference signal in a signal output by the second end of the first detection impedance unit is rotated by 180 degrees relative to the phase of an interference signal in a signal output by the second end of the second detection impedance unit.
In this way, the test loop comprises two capacitors with the same parameters, and when in test, the voltage signal of the second end of the first capacitor to be tested is processed through the first detection impedance unit and the second detection impedance unit, so that the phase of the interference signal in the signal output by the second end of the first detection impedance unit is rotated by 180 degrees relative to the phase of the interference signal in the signal output by the second end of the second detection impedance unit, thereby the background noise in the partial discharge signal is counteracted by using a difference method, and the background noise detected by the partial discharge tester is smaller than 5 pC.
Further, according to an embodiment of the present invention, the first detection impedance unit includes a first resistor, a first capacitor, and a first inductor, a first end of the first resistor, a first end of the first capacitor, and a first end of the first inductor are connected to a second end of the first capacitor under test, a second end of the first resistor, a second end of the first capacitor, and a second end of the first inductor are connected to an input end of the partial discharge tester, the second detection impedance unit includes a second resistor, a second capacitor, and a second inductor, a first end of the second resistor, a first end of the second capacitor, and a first end of the second inductor are connected to a second end of the second capacitor under test, and a second end of the second resistor, a second end of the second capacitor, and a second end of the second inductor are connected to an input end of the partial discharge tester.
In this way, by using a resistor, a capacitor, and an inductor connected in parallel, an interference signal from the outside is suppressed.
Further, according to an embodiment of the present invention, the transformer is a step-up transformer.
In this way, by appropriately selecting the number of turns of the primary side coil and the secondary side coil of the transformer, it is possible to sufficiently consider various voltage specifications in which the capacitor under test is to be put into operation.
Further, according to an embodiment of the present invention, the testing device further includes a protection resistor connected between the first output end of the secondary side coil and the first end of the first voltage divider of the voltage dividing unit, and the second end of the secondary side coil is grounded.
In this way, by appropriately selecting the resistance values of the protection resistors, it is possible to avoid that the individual components of the partial discharge test device operate beyond the nominal operating parameters.
Further, according to the utility model discloses an embodiment, testing arrangement still includes ampere meter and square root voltmeter, and the ampere meter is connected between the first output of voltage regulator and the first input of primary side coil, and square root voltmeter is connected between the first input of primary side coil and the second input of primary side coil.
In this way, by setting the current meter and the root-mean-square voltmeter, the test voltage and current can be monitored in real time.
Further, according to the utility model discloses an embodiment, testing arrangement still includes the peak voltage meter, and the peak voltage meter is connected between the first end of second voltage divider and the second end of second voltage divider.
In this way, by providing a peak voltmeter, the voltage of the second voltage divider can be detected, thereby avoiding that the relevant components of the test apparatus operate in excess of the rated operating parameters.
Further, according to an embodiment of the present invention, the first capacitor under test and the second capacitor under test are capacitors in a power transformer, an operating voltage range of the first capacitor under test is between 40.5 kv and 550 kv, and an operating voltage range of the second capacitor under test is between 40.5 kv and 550 kv.
Use the technical scheme of the utility model, through providing a testing arrangement, utilize first detection impedance unit and second detection impedance unit, the phase place of the interfering signal in the signal of the second end output with first detection impedance unit is 180 degrees for the phase place rotation of the interfering signal in the signal of the second end output of second detection impedance unit to utilize the difference method to offset the background noise in the partial discharge signal, make the background noise that the partial discharge tester detected be less than 5 pC. Therefore, the problem that the accuracy of a detection result is reduced due to overhigh background noise of a partial discharge testing device of a capacitor part of a capacitor voltage transformer product in the prior art is solved.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 shows a schematic view of a testing device according to the present invention;
fig. 2 shows a detailed schematic diagram of a test loop in a test apparatus according to the present invention; and
fig. 3 shows a waveform diagram of background noise detected with a prior art testing device and a testing device according to the invention.
Wherein the figures include the following reference numerals:
10 testing device
100 voltage regulator;
200 transformers;
300 voltage division units;
302 a first voltage divider;
304 a second voltage divider;
400 testing the loop;
402 a first test unit;
404 a second test unit;
406 a partial discharge tester;
402-2 a first capacitor under test;
402-4 capacitor
402-6 inductor
402-8 resistor
404-2 a second capacitor under test;
404-4 capacitor
402-6 inductor
404-8 resistor
500 protective resistor
600 ammeter
700 square root voltage meter
800 peak voltage meter
Detailed Description
In order to avoid conflict, the embodiments and features of the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
The testing device is provided for solving the problem that the testing device for testing the partial discharge of the product capacitor of the capacitor voltage transformer in the prior art is low in accuracy.
First, the partial discharge test voltage and the maximum allowable level for the partial discharge test of the capacitor part of the capacitor voltage transformer product will be briefly described with reference to table 1:
TABLE 1
In table 1, CT denotes a current transformer, and VT denotes a voltage transformer.
In table 1 it is noted that if the neutral system is defined, the values for the insulated or non-actively grounded neutral system are valid. Furthermore, the maximum allowable partial discharge level is effective for frequencies other than the rated frequency.
Hereinafter, a test system according to the present invention is described in detail with reference to fig. 1 and 2.
The testing device 10 is used for performing a partial discharge test on a first capacitor under test 402-2 and a second capacitor under test 404-2 in a capacitor voltage transformer, and the testing device 10 comprises: a voltage regulator 100, which may be provided with a slider, for regulating an output voltage by the voltage regulator; a transformer 200 including a primary side coil and a secondary side coil, a first output terminal of the voltage regulator being connected to a first input terminal of the primary side coil, and a second output terminal of the voltage regulator being connected to a second input terminal of the primary side coil; a voltage dividing unit 300, including a first voltage divider 302 and a second voltage divider 304, wherein a first end of the first voltage divider 302, a first end of a first capacitor under test 402-2, and a first end of the second capacitor under test 404-2 are connected to a common connection point, a first output end of a secondary side coil is connected to the common connection point, a second output end of the secondary side coil is connected to a second end of the second voltage divider 304, and a second end of the first voltage divider 302 is connected to the first end of the second voltage divider 304; the test loop 400 includes a first detection impedance unit, a second detection impedance unit, a common line, and a partial discharge tester 406, wherein a voltage signal of a second terminal of the first capacitor under test is input to the first terminal of the first detection impedance unit, a voltage signal of a second terminal of the second capacitor under test is input to the first terminal of the second detection impedance unit, the second terminal of the first detection impedance unit and the second terminal of the second detection impedance unit are connected to an input terminal of the partial discharge tester through the common line, and the first detection impedance unit processes the voltage signal of the second terminal of the first capacitor under test, such that a phase of an interference signal in a signal output by the second terminal of the first detection impedance unit is rotated by 180 degrees with respect to a phase of an interference signal in a signal output by the second terminal of the second detection impedance unit.
Preferably, as shown in FIG. 2, the first detection impedance unit includes a first resistor 402-8, a first capacitor 402-4, a first inductor 402-6, a first end of the first resistor 402-8, a first end of the first capacitor 402-4, and a first end of the first inductor 402-6 are connected to a second end of the first capacitor under test 402-2, a second end of the first resistor 402-8, a second end of the first capacitor 402-4, and a second end of the first inductor 402-6 are connected to an input end of the partial discharge tester 406, the second detection impedance unit includes a second resistor 404-8, a second capacitor 404-4, and a second inductor 404-6, a first end of the second resistor 404-8, a first end of the second capacitor 404-4, and a first end of the second inductor 404-6 are connected to a second end of the second capacitor under test 404-2, a second terminal of the second resistor 404-8, a second terminal of the second capacitor 404-4, and a second terminal of the second inductor 404-6 are connected to an input of the partial discharge tester.
Preferably, the transformer 200 is a step-up transformer.
Preferably, the test apparatus further includes a protection resistor 500 connected between the first output terminal of the secondary side coil and the first terminal of the first voltage divider 302 of the voltage dividing unit, and the second terminal of the secondary side coil is grounded.
Preferably, the test apparatus further includes an ammeter 600 and a root-mean-square voltmeter 700, the ammeter 600 is connected between the first output terminal of the voltage regulator 100 and the first input terminal of the primary side coil, and the root-mean-square voltmeter 700 is connected between the first input terminal of the primary side coil and the second input terminal of the primary side coil.
Fig. 1 shows a schematic view of an embodiment of a testing device according to the present invention. In fig. 1, a voltage regulator 100 in a test apparatus 10 is provided with a slider so as to adjust an output voltage. By connecting the first output terminal of the voltage regulator 100 to the first input terminal of the primary side coil and the second output terminal of the voltage regulator 100 to the second input terminal of the primary side coil, the voltage output from the voltage regulator 100 is applied to the primary side coil of the transformer 700. The transformer 700 may be a boosting type transformer so that the transformer 700 can boost the voltage output from the voltage regulator 100 to a desired voltage. For example, the desired voltage is a voltage specification of 5.5KV to 12KV to which the capacitor under test is to be put. By connecting the current meter 600 between the first output terminal of the voltage regulator 100 and the first input terminal of the primary side coil, the current of the primary side coil can be monitored in real time. Further, by connecting the root-mean-square voltmeter 700 between the first input terminal of the primary side coil and the second input terminal of the primary side coil, the voltage of the primary side coil can be monitored in real time. Thus, the wiper of the transformer 100 can be adjusted to induce a desired voltage in the secondary side coil of the transformer 200.
In addition, a voltage dividing unit 300 is disposed on the secondary side coil side of the transformer 200, the voltage dividing unit 300 is connected in parallel with the secondary side coil, the voltage dividing unit includes a first voltage divider 302 and a second voltage divider 304, a first end of the first voltage divider 302, a first end of the first capacitor under test 402-2, and a first end of the second capacitor under test 404-2 are connected to a common connection point, a first output end of the secondary side coil is connected to the common connection point, a second output end of the secondary side coil is connected to a second end of the second voltage divider 304, and a second end of the first voltage divider 302 is connected to the first end of the second voltage divider 304. The first voltage divider 302 and the second voltage divider 304 are each constituted by a capacitor. The first and second voltage dividers 302 and 304 divide the voltage of the secondary side coil of the transformer 200 to adjust the voltage signals input to the first and second test units 402 and 404, and the peak voltage meter 800 is connected between the first end of the second voltage divider 304 and the second end of the second voltage divider 304 to monitor the voltage of the second voltage divider 304 in real time.
When the specification parameters of the capacitor under test are determined, the parameters of the voltage divider 100, the transformer 200, and the voltage divider 300 are appropriately selected to match the capacitor under test.
Preferably, the test device 10 further includes a protection resistor 500, and the protection resistor 500 is connected between the first output terminal of the secondary side coil and the first terminal of the first voltage divider 302 of the voltage dividing unit 300. By appropriately selecting the resistance value of the protection resistor 500, each component provided on the secondary side coil side is operated under appropriate current and voltage conditions, thereby ensuring that each component can be normally operated.
The test apparatus 10 is provided with a test circuit 400 on the secondary side coil side. The test circuit 400 is connected in parallel with the voltage dividing unit 300. The test loop 400 includes: the partial discharge tester comprises a first detection impedance unit, a second detection impedance unit, a public line and a partial discharge tester 406, wherein a voltage signal of a second end of a first capacitor to be tested is input to a first end of the first detection impedance unit, a voltage signal of a second end of a second capacitor to be tested is input to a first end of the second detection impedance unit, a second end of the first detection impedance unit and a second end of the second detection impedance unit are connected to an input end of the partial discharge tester through the public line, and the first detection impedance unit processes the voltage signal of the second end of the first capacitor to be tested, so that the phase of an interference signal in a signal output by the second end of the first detection impedance unit is rotated by 180 degrees relative to the phase of an interference signal in a signal output by the second end of the second detection impedance unit.
Hereinafter, a specific configuration of the test loop 400 will be described in detail with reference to fig. 2.
Fig. 2 shows a detailed schematic diagram of a test loop in a test apparatus according to the present invention. The first test unit 402 includes a first capacitor under test 402-2, a capacitor 402-4, an inductor 402-6, and a resistor 402-8. As shown in FIG. 2, a first end of the first resistor 402-8, a first end of the first capacitor 402-4, and a first end of the first inductor 402-6 are connected to a second end of the first capacitor under test 402-2, and a second end of the first resistor 402-8, a second end of the first capacitor 402-4, and a second end of the first inductor 402-6 are connected to an input of the partial discharge tester 406. Similarly, second test unit 404 includes second capacitor under test 404-2, capacitor 404-4, inductor 404-6, and resistor 404-8. In the second test unit 404, a first end of a second resistor 404-8, a first end of a second capacitor 404-4, and a first end of a second inductor 404-6 are connected to a second end of a second capacitor under test 404-2, and a second end of the second resistor 404-8, a second end of the second capacitor 404-4, and a second end of the second inductor 404-6 are connected to an input terminal of the partial discharge tester. The first capacitor under test 402-2 and the second capacitor under test 404-2 are power capacitors to be put into operation, and both have the same specification parameters. In addition, capacitor 402-4, inductor 402-6, and resistor 402-8 in first test unit 402 have the same parameters as capacitor 404-4, inductor 404-6, and resistor 404-8, respectively, in second test unit 404. In this configuration, the test loop 400 includes a first detection impedance unit, a second detection impedance unit, a common line, and a partial discharge tester 406, a voltage signal of the second terminal of the first capacitor under test is input to the first terminal of the first detection impedance unit, a voltage signal of the second terminal of the second capacitor under test is input to the first terminal of the second detection impedance unit, the second terminal of the first detection impedance unit and the second terminal of the second detection impedance unit are connected to an input terminal of the partial discharge tester via the common line, and the first detection impedance unit processes the voltage signal of the second terminal of the first capacitor under test such that a phase of an interference signal in a signal output from the second terminal of the first detection impedance unit is rotated by 180 degrees with respect to a phase of an interference signal in a signal output from the second terminal of the second detection impedance unit. During the test by using the testing device of the present invention, the capacitor 402-4, the inductor 402-6, the resistor 402-8 in the first testing unit 402 and the capacitor 404-4, the inductor 404-6 and the resistor 404-8 in the second testing unit 404 are used to process the voltage signal of the second end of the first tested capacitor, so that the phase of the interference signal in the signal output from the second end of the first detecting impedance unit is rotated 180 degrees relative to the phase of the interference signal in the signal output from the second end of the second detecting impedance unit, thereby canceling the interference signal in the partial discharge signal. The partial discharge signal from which the disturbance signal has been cancelled is input to the partial discharge unit 406, and thus the partial discharge from the capacitor and the external disturbance are identified. At this time, the background noise 3pC meets the standard regulation less than 5pC, thereby simplifying the test flow and improving the test efficiency.
Fig. 3 shows a waveform diagram of background noise detected with a prior art testing device and a testing device according to the invention. Fig. 3 (a) shows a waveform diagram of background noise detected by a test apparatus of the related art, and fig. 3 (B) shows a waveform diagram of background noise detected by a test apparatus of the present invention. In fig. 3 (a), the background noise is 16.91pC, and in fig. 3 (B), the background noise is 2.96 pC. Can be clear and definite through the above-mentioned experiment, utilize the utility model discloses a testing arrangement can realize showing of background noise and descend to ensure measuring sensitivity and accuracy nature.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
1. sensitivity to measurement results of partial discharge testing of a product capacitor portion of a capacitive voltage transformer is improved.
2. The two capacitors can be tested simultaneously, so that the test efficiency is improved.
It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. Testing device (10) for partial discharge testing of a capacitor in a capacitive voltage transformer, said capacitor comprising a first capacitor under test (402-2) and a second capacitor under test (404-2), characterized in that said testing device comprises:
a voltage regulator (100);
a transformer (200) comprising a primary side coil and a secondary side coil, a first output of the voltage regulator being connected to a first input of the primary side coil, a second output of the voltage regulator being connected to a second input of the primary side coil;
a voltage dividing unit (300) including a first voltage divider (302) and a second voltage divider (304), a first end of the first voltage divider (302), a first end of the first capacitor under test (402-2), and a first end of the second capacitor under test (404-2) being connected to a common connection point, a first output end of the secondary side coil being connected to the common connection point, a second output end of the secondary side coil being connected to a second end of the second voltage divider (304), the second end of the first voltage divider (302) being connected to the first end of the second voltage divider (304);
a test loop (400) comprising a first detection impedance unit, a second detection impedance unit, a common line, and a partial discharge tester (406) to which a voltage signal of a second terminal of the first capacitor under test is input to a first terminal of the first detection impedance unit, a voltage signal of the second terminal of the second capacitor under test is input to the first terminal of the second detection impedance unit, a second terminal of the first detection impedance unit and a second terminal of the second detection impedance unit are connected to an input terminal of the partial discharge tester via the common line, the first detection impedance unit processes a voltage signal of the second end of the first capacitor under test, such that a phase of an interference signal in a signal output from the second terminal of the first detection impedance unit is rotated by 180 degrees with respect to a phase of an interference signal in a signal output from the second terminal of the second detection impedance unit.
2. The test device according to claim 1, wherein the first detection impedance unit comprises a first resistor (402-8), a first capacitor (402-4), a first inductor (402-6), a first end of the first resistor (402-8), a first end of the first capacitor (402-4), a first end of the first inductor (402-6) are connected to a second end of the first capacitor under test, a second end of the first resistor (402-8), a second end of the first capacitor (402-4), a second end of the first inductor (402-6) are connected to an input of the partial discharge tester, the second detection impedance unit comprises a second resistor (404-8), a second capacitor (404-4), a second inductor (404-6), a first end of the second resistor (404-8), a first end of the second capacitor (404-4), and a first end of the second inductor (404-6) are connected to a second end of the second capacitor under test, and a second end of the second resistor (404-8), a second end of the second capacitor (404-4), and a second end of the second inductor (404-6) are connected to the input of a partial discharge tester.
3. The testing device according to claim 1, wherein the transformer (200) is a step-up transformer.
4. The test device according to claim 3, further comprising a protection resistor (500) connected between the first output terminal of the secondary side coil and the first terminal of the first voltage divider of the voltage dividing unit, and the second terminal of the secondary side coil is grounded.
5. The test device of claim 1, further comprising an ammeter (600) connected between the first output of the voltage regulator and the first input of the primary side coil, and a root mean square voltmeter (700) connected between the first input of the primary side coil and a second input of the primary side coil.
6. The test device according to claim 4, further comprising a peak voltage meter (800) connected between the first terminal of the second voltage divider and the second terminal of the second voltage divider.
7. The test apparatus according to claim 4, wherein the test apparatus is configured to perform partial discharge testing on a first capacitor under test and a second capacitor under test in a power transformer, the first capacitor under test (402-2) and the second capacitor under test (404-2), the first capacitor under test (402-2) having an operating voltage in a range of 40.5 kV to 550 kV, and the second capacitor under test (404-2) having an operating voltage in a range of 40.5 kV to 550 kV.
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| CN202020222511.9U CN211928080U (en) | 2020-02-27 | 2020-02-27 | Testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020222511.9U CN211928080U (en) | 2020-02-27 | 2020-02-27 | Testing device |
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| CN211928080U true CN211928080U (en) | 2020-11-13 |
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