Gas Insulated Switchgear Mechanical and Electrical Combined Test System

Abstract

The present invention discloses a mechanical and electrical combined test system for a gas-insulated switchgear. In the mechanical and electrical combined test system for the gas-insulated switchgear, a transformer provides an adjustable voltage; a first high-voltage electrode is connected to the transformer; a vibration table provides a mechanically vibrating signal with adjustable parameters; a controller is connected to the vibration table to adjust the parameters of the vibration table; a first defect model is a gas-insulated switchgear with a predetermined defect, the first defect model is supported on the vibration table, one end of the first defect model is connected to the first high-voltage electrode, and the other end is connected to a first ground electrode; a second defect model is a gas-insulated switchgear with the same predetermined defect, a second high-voltage electrode is connected to the transformer; a first ultrasonic sensor is arranged on the first ground electrode to measure a first partial discharge signal of the first defect model; a second ultrasonic sensor is arranged on the second ground electrode to measure a second partial discharge signal of the second defect model; an oscilloscope is connected to the first ultrasonic sensor and the second ultrasonic sensor.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical equipment testing, and particularly relates to a mechanical and electrical combined test system for gas-insulated switchgear. Background Art

[0002] Gas-insulated metal-enclosed switchgear (GIS) is one of the most important equipment in the current power system, and its operation reliability is directly related to the safety and stability of the power grid system. During the operation of GIS, alternating currents of hundreds to thousands of amperes will flow through the internal conductors, and hundreds of kilovolts of voltage will be borne. The electromagnetic force generated by the current and the electric field force generated by the voltage will cause mechanical vibrations during the operation of GIS equipment. Mechanical vibrations will cause changes in insulation defects, such as affecting the jumping height of metal particles, etc., and will affect the partial discharge characteristics. At present, the influence of mechanical vibrations is not considered when studying the partial discharge characteristics. Laboratory tests only study the partial discharge characteristics under high voltage, and the combined test of mechanical vibration and partial discharge cannot be realized, which leads to the inconsistency between the laboratory test results and the actual on-site operating conditions, resulting in inaccurate analysis of on-site detection results.

[0003] In view of this problem, the invention proposes a mechanical and electrical combined test system and method for gas-insulated switchgear, which can realize the combined test of mechanical vibration and partial discharge, and study the influence law of mechanical vibration on partial discharge characteristics.

[0004] The above information disclosed in the background art section is only used to enhance the understanding of the background of the invention, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art in this country. Summary of the Invention

[0005] In view of the problems existing in the prior art, the invention proposes a mechanical and electrical combined test system for gas-insulated switchgear, which realizes the combined test of mechanical vibration and partial discharge, and can conveniently and accurately obtain the influence of mechanical vibration on partial discharge characteristics.

[0006] The object of the invention is achieved by the following technical solutions. A mechanical and electrical combined test system for gas-insulated switchgear includes:

[0007] A transformer that provides adjustable voltage;

[0008] A first high-voltage electrode connected to the transformer;

[0009] A vibration table that provides a mechanically vibrating signal with adjustable parameters;

[0010] A controller connected to the vibration table to adjust the parameters of the vibration table;

[0011] The first defect model, which is a gas-insulated switchgear with a predetermined defect, is supported on the vibration table. One end of the first defect model is connected to the first high-voltage electrode, and the other end is connected to the first ground electrode;

[0012] The second defect model, which is a gas-insulated switchgear with the same predetermined defect, has one end connected to the second high-voltage electrode and the other end connected to the second ground electrode. The second high-voltage electrode is connected to the transformer;

[0013] The first ultrasonic sensor is arranged on the first ground electrode to measure the first partial discharge signal of the first defect model;

[0014] The second ultrasonic sensor is arranged on the second ground electrode to measure the second partial discharge signal of the second defect model;

[0015] The oscilloscope is connected to the first ultrasonic sensor and the second ultrasonic sensor.

[0016] In the mechanical and electrical combined test system of the gas-insulated switchgear, a processor is further included, which is connected to the transformer, the controller, the first ultrasonic sensor and the second sensor. The processor controls the output voltage of the transformer and the mechanical vibration signal, and processes the first partial discharge signal and the second partial discharge signal based on the output voltage and the mechanical vibration signal.

[0017] In the mechanical and electrical combined test system of the gas-insulated switchgear, the processor includes a comparison unit for comparing the first partial discharge signal and the second partial discharge signal.

[0018] In the mechanical and electrical combined test system of the gas-insulated switchgear, the processor includes a CPU.

[0019] In the mechanical and electrical combined test system of the gas-insulated switchgear, the second defect model is supported on a stationary bearing surface.

[0020] In the mechanical and electrical combined test system of the gas-insulated switchgear, both the first partial discharge signal and the second partial discharge signal include the partial discharge inception voltage, the discharge amplitude or the discharge frequency.

[0021] In the mechanical and electrical combined test system of the gas-insulated switchgear, the predetermined defect includes a free metal particle defect or a metal tip defect.

[0022] Compared with the prior art, the present invention has the following advantages: The present invention applies mechanical vibration signals with different amplitudes to the vibration table, gradually increases the test voltage, and uses the first and second ultrasonic sensors 5 to measure the partial discharge signals of two sets of the same defect models. By comparing the partial discharge signals measured by the two ultrasonic sensors, the influence of mechanical vibration on the partial discharge characteristics can be obtained. The combined test of the mechanical and electrical characteristics of gas-insulated switchgear under different defect types can be realized, and the influence of mechanical vibration on partial discharge can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the following detailed description of the preferred specific embodiments, various other advantages and benefits of the present invention will become clear to those of ordinary skill in the art. The drawings in the specification are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Moreover, throughout the drawings, the same reference numerals are used to represent the same components.

[0024] In the drawings:

[0025] Figure 1 is a schematic structural diagram of a mechanical and electrical combined test system for gas-insulated switchgear according to an embodiment of the present invention.

[0026] The present invention will be further explained below in conjunction with the drawings and embodiments. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will refer to the attached Figure 1 The specific embodiments of the present invention will be described in more detail. Although the specific embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0028] It should be noted that in the description and claims, certain terms are used to refer to specific components. Those skilled in the art should understand that different terms may be used to refer to the same component. The description and claims of this specification do not use the difference in terms as a way to distinguish components, but use the difference in functions of components as the criterion for distinction. For example, the term "comprising" or "including" mentioned throughout the description and claims is an open-ended term, so it should be interpreted as "including but not limited to". The subsequent description in the specification is the preferred embodiment for implementing the present invention, but the description is for the purpose of the general principles of the specification and is not used to limit the scope of the present invention. The protection scope of the present invention shall be determined by the scope defined by the appended claims.

[0029] For the convenience of understanding the embodiments of the present invention, the following will further explain with specific embodiments in conjunction with the accompanying drawings, and each accompanying drawing does not constitute a limitation to the embodiments of the present invention.

[0030] For better understanding, as Figure 1 shown, the gas-insulated combined electrical equipment mechanical and electrical joint test system includes

[0031] A transformer 1, which provides adjustable voltage;

[0032] A first high-voltage electrode 2, which is connected to the transformer 1;

[0033] A vibration table 6, which provides a mechanically vibrating signal with adjustable parameters;

[0034] A controller 7, which is connected to the vibration table 6 to adjust the parameters of the vibration table 6;

[0035] A first defect model 3, which is a gas-insulated combined electrical equipment with a predetermined defect. The first defect model 3 is supported on the vibration table 6. One end of the first defect model 3 is connected to the first high-voltage electrode 2, and the other end is connected to the first ground electrode 4;

[0036] A second defect model 8, which is a gas-insulated combined electrical equipment with the same predetermined defect. One end of the second defect model 8 is connected to the second high-voltage electrode 11, and the other end is connected to the second ground electrode 12. The second high-voltage electrode 11 is connected to the transformer 1;

[0037] A first ultrasonic sensor 5, which is arranged on the first ground electrode 4 to measure the first partial discharge signal of the first defect model 3;

[0038] A second ultrasonic sensor 9, which is arranged on the second ground electrode 12 to measure the second partial discharge signal of the second defect model 8;

[0039] An oscilloscope 10, which is connected to the first ultrasonic sensor 5 and the second ultrasonic sensor 9.

[0040] In a preferred embodiment of the mechanical and electrical combined test system for gas insulated switchgear, it further includes a processor, which is connected to the transformer 1, the controller 7, the first ultrasonic sensor 5 and the second sensor. The processor controls the output voltage of the transformer 1 and the mechanical vibration signal, and processes the first partial discharge signal and the second partial discharge signal based on the output voltage and the mechanical vibration signal.

[0041] In a preferred embodiment of the mechanical and electrical combined test system for gas insulated switchgear, the processor includes a comparison unit for comparing the first partial discharge signal and the second partial discharge signal.

[0042] In a preferred embodiment of the mechanical and electrical combined test system for gas insulated switchgear, the processor includes a CPU.

[0043] In a preferred embodiment of the mechanical and electrical combined test system for gas insulated switchgear, the second defect model 8 is supported on a stationary bearing surface.

[0044] In a preferred embodiment of the mechanical and electrical combined test system for gas insulated switchgear, both the first partial discharge signal and the second partial discharge signal include the partial discharge inception voltage, the discharge amplitude or the discharge frequency.

[0045] In a preferred embodiment of the mechanical and electrical combined test system for gas insulated switchgear, the predetermined defect includes a free metal particle defect or a metal tip defect.

[0046] In one embodiment, the processor is provided with a display screen for displaying the comparison result of the first partial discharge signal and the second partial discharge signal. Further, the display screen is a touch screen.

[0047] In one embodiment, two sets of defect models with exactly the same structure are adopted. One set is placed on the vibration table 6, and the other set is not placed on the vibration table 6. The vibration table 6 can apply mechanical vibration signals of different intensities.

[0048] In one embodiment, high voltage is applied to the two sets of defect models simultaneously, and ultrasonic partial discharge signals are measured simultaneously.

[0049] In one embodiment, partial discharge parameters such as the partial discharge inception voltage, the discharge amplitude, and the discharge frequency measured by the two sets of models are compared to obtain the influence law of the mechanical vibration signal on the partial discharge characteristics of the defect.

[0050] In one embodiment, the test system includes a transformer 1, two sets of first defect models 3 and second defect models 8 with the same structure, a vibration table 6, and an oscilloscope 10. To place the defect model 3 on the vibration table 6, the high-voltage output terminal of the test transformer 1 is simultaneously connected to the high-voltage electrodes 2 of the two sets of defect models. Different amplitudes of mechanical vibration signals are applied to the vibration table, and the test voltage is gradually increased. The first ultrasonic sensor 5 and the second ultrasonic sensor 9 placed on the low-voltage plates of the defect models are used to measure the partial discharge signals of the two sets of defect models. By comparing the partial discharge signals measured by the two ultrasonic sensors, the influence of mechanical vibration on the partial discharge characteristics is obtained. The features are that the system and method can realize the joint test of the mechanical and electrical characteristics of gas-insulated switchgear under different defect types, and can obtain the influence law of mechanical vibration on partial discharge.

[0051] For the above embodiment, this embodiment fully embodies the core idea of the present invention: that is, two sets of defect models with the same structure are used. One set is placed on the vibration table and mechanical vibration signals are applied, and at the same time, the partial discharge signals are measured. By comparing the partial discharge parameters of the two sets of defect models, the influence law of mechanical vibration on partial discharge is obtained.

[0052] The following is a specific implementation manner, and its application schematic diagram is as shown in the appendix Figure 1 shown.

[0053] Two sets of first defect models 3 and second defect models 8 with exactly the same structure are adopted. The defect models can be free metal particles or metal tips, etc., and can be arbitrarily selected according to the actual situation, but it is necessary to ensure that the structures of the two sets of models are exactly the same. One set of defect models is placed on the vibration table 6, and the other set of defect models is fixed on the test bench or the ground. The vibration intensity of the vibration table can be arbitrarily adjusted by the controller 7. The high voltage output by the test transformer 1 is simultaneously connected to the high voltage electrodes 2 of the defect models to apply a high voltage to the defect models to excite partial discharge. The first ultrasonic sensor 5 and the second ultrasonic sensor 9 are respectively placed on the first ground electrode 4 and the second ground electrode 12 of the defect models to measure the partial discharge signals, and the detected partial discharge signals are sent to the oscilloscope 10. During the specific test, first, actual mechanical vibration is applied to the first defect model 3 placed on the vibration table, and the intensity of the mechanical vibration can be arbitrarily set. Then, the excitation voltage is gradually applied, and the obtained partial discharge parameters are recorded, such as the inception voltage, discharge amplitude, and discharge frequency. Compare the partial discharge parameters detected by the first defect model 3 and the second defect model 8. The first defect model 3 is the detection result of partial discharge under the combined action of electricity and machinery, and the second defect model 8 is only the detection result of partial discharge under the action of electricity. The influence law of mechanical vibration on partial discharge can be obtained through the comparison of partial discharge parameters. In practical applications, the influence laws of parameters such as mechanical vibration intensity and frequency can also be studied. According to the needs of the test, various parameters can be flexibly adjusted. For example, the type of defect model can be arbitrarily selected, the intensity and frequency of mechanical vibration can be arbitrarily selected, and the voltage type such as AC or DC can be arbitrarily selected.

[0054] Although the embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments and application fields. The above specific embodiments are merely illustrative and guiding, rather than restrictive. Those of ordinary skill in the art can also make many forms under the inspiration of this specification and without departing from the scope protected by the claims of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A mechanical and electrical combined test system for a gas-insulated switchgear, comprising: A transformer that provides adjustable voltage; A first high-voltage electrode connected to the transformer; A vibration table that provides a mechanically vibrating signal with adjustable parameters; A controller connected to the vibration table to adjust the parameters of the vibration table; A first defect model, which is a gas-insulated switchgear with a predetermined defect. The first defect model is supported on the vibration table. One end of the first defect model is connected to the first high-voltage electrode, and the other end is connected to the first ground electrode; A second defect model, which is a gas-insulated switchgear with the same predetermined defect. One end of the second defect model is connected to the second high-voltage electrode, and the other end is connected to the second ground electrode. The second high-voltage electrode is connected to the transformer; A first ultrasonic sensor disposed on the first ground electrode to measure the first partial discharge signal of the first defect model; A second ultrasonic sensor disposed on the second ground electrode to measure the second partial discharge signal of the second defect model; An oscilloscope connected to the first ultrasonic sensor and the second ultrasonic sensor, further comprising a processor connected to the transformer, the controller, the first ultrasonic sensor and the second sensor. The processor is provided with a display screen for displaying the comparison result of the first partial discharge signal and the second partial discharge signal. The second defect model is supported on a stationary bearing surface. The first partial discharge signal and the second partial discharge signal include the discharge amplitude of the partial discharge and the discharge frequency of the partial discharge. The influence law of mechanical vibration on partial discharge is obtained by comparing the discharge amplitudes and discharge frequencies of the two sets of defect models. Among them, mechanically vibrating signals with different amplitudes are applied to the vibration table, and the test voltage is gradually increased. The processor includes a comparison unit for comparing the first partial discharge signal and the second partial discharge signal.

2. The mechanical and electrical combined test system for a gas-insulated switchgear according to claim 1, wherein, The processor includes a CPU and an MCU.

3. The mechanical and electrical combined test system for a gas-insulated switchgear according to claim 1, wherein, The first partial discharge signal and the second partial discharge signal include the partial discharge inception voltage.

4. The mechanical and electrical combined test system for a gas-insulated switchgear according to claim 1, wherein, The predetermined defect includes a free metal particle defect or a metal tip defect.

5. The mechanical and electrical combined test system for a gas-insulated switchgear according to claim 1, wherein, The processor controls the output voltage of the transformer and the mechanical vibration signal, and processes the first partial discharge signal and the second partial discharge signal based on the output voltage and the mechanical vibration signal.

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