A self-resonant inductance pressure measurement test device with a capacitive reactance fusion structure

Abstract

The present invention relates to a self-resonant inductance pressure measurement test device with a capacitive reactance fusion structure, which includes a support base, an insulating support cylinder, and multiple capacitive reactance fusion units arranged end to end in the vertical direction. Each capacitive reactance fusion unit includes an external support cylinder, a capacitor bank and a coil disposed inside the external support cylinder. The coil is located at the center of the external support cylinder, and the capacitor bank is arranged around the outside of the coil, between the coil and the external support cylinder. Multiple capacitors are connected by internal connection lines. Coil taps are led out from both the upper and lower ends of the coil, and capacitor taps are led out from both the upper and lower ends of the capacitor bank. Among them, two coil taps are led out from the lower end of the coil of the lowermost capacitive reactance fusion unit. The insulating support cylinder is fixed on the support base, and the lowermost capacitive reactance fusion unit is fixed on the insulating support cylinder. Compared with the prior art, the present invention has the advantages of small occupied site and can detect the equipment status, etc.

Description

Technical Field

[0001] The present invention relates to the field of high - voltage tests in power engineering, and particularly to a self - resonant inductance pressure - measuring test device with a capacitive - inductive fusion structure. Background Art

[0002] The AC withstand voltage test applies an AC test voltage to the main insulation of switchgear such as GIS / HGIS. The AC withstand voltage test is a test that most conforms to the actual operating conditions of electrical equipment, an important means to avoid insulation accidents, and a decisive test among various insulation tests of switchgear.

[0003] When conducting the AC withstand voltage test of switchgear on - site, a variable - frequency series - resonant test device is usually used. Traditional variable - frequency series - resonant test devices mainly include equipment such as a variable - frequency control system, an excitation transformer, a step - up reactor, and a measuring voltage divider. Among them, the step - up reactor and the measuring voltage divider have the highest voltage and are relatively large in volume. In recent years, a step - up reactor system using inductive voltage measurement has emerged. This device no longer requires a measuring voltage divider. However, since this device cancels the measuring voltage divider, it cannot achieve self - resonant boosting of the test device and cannot detect the state of the test equipment itself. Summary of the Invention

[0004] The purpose of the present invention is to provide a self - resonant inductance pressure - measuring test device with a capacitive - inductive fusion structure. While greatly reducing the amount of labor required for hoisting the measuring voltage divider and the test site required, it maintains the function of self - boosting through series resonance of the built - in reactor and capacitor, achieving the effect of detecting the state of the test equipment itself. Since the resonance frequency is usually higher than the 50Hz power frequency during on - site tests, the capacitor in the self - resonant inductance pressure - measuring test device with a capacitive - inductive fusion structure also functions as a compensating capacitor, reducing the resonance frequency and making the resonance frequency closer to the 50Hz power frequency, which is beneficial for detecting the state of the test item.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A self-resonant inductance pressure measurement test device with a capacitive reactance fusion structure, comprising a support base, an insulating support cylinder, and multiple sections of capacitive reactance fusion units. The capacitive reactance fusion units are arranged end to end in the vertical direction. The capacitive reactance fusion unit includes an external support cylinder, a capacitor bank and a coil placed inside the external support cylinder. The coil is located in the center of the external support cylinder. The capacitor bank is arranged around the outside of the coil, between the coil and the external support cylinder, and multiple capacitors are connected by internal connection wires. Coil taps are led out from both the upper and lower ends of the coil, and capacitor taps are led out from both the upper and lower ends of the capacitor bank. Among them, two coil taps are led out from the lower end of the coil of the lowermost capacitive reactance fusion unit. The insulating support cylinder is fixed on the support base, and the lowermost capacitive reactance fusion unit is fixed on the insulating support cylinder.

[0007] The capacitive reactance fusion unit further includes an upper cover plate and a lower cover plate.

[0008] In any capacitive reactance fusion unit, the upper and lower parts of the capacitor bank are connected by internal connection wires to form an equipotential.

[0009] The device further includes a grading ring group, and the grading ring group is installed on the top of the uppermost capacitive reactance fusion unit.

[0010] The external support cylinder is cylindrical.

[0011] The inside of the capacitive reactance fusion unit is filled with dry air, dry nitrogen or insulating oil.

[0012] The coil tap at the upper end of the capacitive reactance fusion unit is connected to the coil tap at the lower end of the upper capacitive reactance fusion unit, and the capacitor tap at the upper end of the capacitive reactance fusion unit is connected to the capacitor tap at the lower end of the upper capacitive reactance fusion unit.

[0013] The coil taps between adjacent capacitive reactance fusion units are connected by external connection wires, and the capacitor taps between adjacent capacitive reactance fusion units are connected by external connection wires.

[0014] The internal connection wire is a flexible wire or a copper busbar.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. While greatly reducing the amount of labor required for hoisting the measuring voltage divider and the test site required, it maintains the function of being able to self-boost voltage through the series resonance of the built-in reactor and capacitor, achieving the effect of detecting the state of the test equipment itself.

[0017] 2. Since the resonance frequency is usually higher than the 50Hz power frequency during on-site tests, the capacitor in the self-resonant inductance pressure measurement test device with a capacitive-reactance fusion structure also acts as a compensating capacitor, reducing the resonance frequency and making it closer to the 50Hz power frequency, which is beneficial for detecting the state of the test object.

[0018] 3. The grading ring group is installed on the capacitive-reactance fusion unit, which plays a role in voltage equalization and preventing corona generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0020] Figure 2 is a schematic structural diagram of the capacitive-reactance fusion unit in an embodiment of the present invention;

[0021] Figure 3 is a schematic structural diagram of the external support cylinder and the cover plate in an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of the principle of the present invention;

[0023] Figure 5 is a schematic diagram of the principle of the present invention when the test object capacitor is not connected;

[0024] Wherein: 1. Support base, 2. Insulating support cylinder, 3. Capacitive-reactance fusion unit, 4. External connection wire, 5. Grading ring group, 301. Coil, 302. Capacitor bank, 303. Internal connection wire, 304. Coil tap, 305. Capacitor tap, 306. External support cylinder, 307. Upper cover plate, 308. Lower cover plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present invention will be described in detail below with reference to the drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation manner and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0026] A self-resonant inductance pressure measurement test device with a capacitive-reactance fusion structure, as Figures 1 to 3As shown in the figure, it includes a support base 1, an insulating support cylinder 2, and multiple sections of capacitive-reactance fusion units 3. The capacitive-reactance fusion units 3 are arranged end to end in the vertical direction. The capacitive-reactance fusion unit 3 includes an external support cylinder 306, a capacitor bank 302 and a coil 301 placed inside the external support cylinder 306. The coil 301 is located at the center of the external support cylinder 306. The capacitor bank 302 is arranged around the outside of the coil 301, located between the coil 301 and the external support cylinder 306, and the front and rear capacitors are connected by an internal connection wire 303. Coil taps 304 are led out from both the upper and lower ends of the coil 301, and capacitive taps 305 are led out from both the upper and lower ends of the capacitor bank 302. Among them, two coil taps 304 are led out from the lower end of the coil 301 of the lowermost capacitive-reactance fusion unit 3. The insulating support cylinder 2 is fixed on the support base 1, and the lowermost capacitive-reactance fusion unit 3 is fixed on the insulating support cylinder 2.

[0027] In the above structure, the number of capacitive-reactance fusion units 3 can be adjusted as needed. In this embodiment, a total of four sections are configured.

[0028] As Figure 4 shown, the self-resonant inductance voltage measurement test device of the capacitive-reactance fusion structure is a key part of the variable-frequency series resonance test device. The variable-frequency series resonance test device uses the principle of series resonance, adopts an excitation transformer to excite the series resonance circuit, adjusts the output frequency of the variable-frequency control system, makes the reactor and the test product capacitor in series resonance, and the resonance voltage is the voltage applied to the test product. At the same time, the voltage measurement is carried out by using the voltage division principle between the inductance of part of the coil between the two taps at the bottom of the reactor and the total inductance of the reactor.

[0029] Before the test equipment is connected to the test product equipment, it is usually necessary to perform self-boosting on the test equipment to verify the state of the test equipment itself and avoid adverse effects on the test product equipment. At this time, there is no test product capacitor. The coil tap 304 at the upper end of each capacitive-reactance fusion unit 3 is connected to the coil tap 304 at the lower end of the upper capacitive-reactance fusion unit 3, and the capacitive tap 305 at the upper end of the capacitive-reactance fusion unit 3 is connected to the capacitive tap 305 at the lower end of the upper capacitive-reactance fusion unit 3. The topmost capacitive tap 305 and coil tap 304 are connected to the voltage equalizing ring group 5. One of the coil taps 304 at the lowermost end of the lowermost capacitive-reactance fusion unit 3 is connected to the output end of the excitation transformer and the low-voltage end of the measurement module, and the other coil tap 304 is connected to the high-voltage end of the measurement module. The capacitive tap 305 at the lower end of the lowermost capacitive-reactance fusion unit 3 is grounded. In this way, all the coils 301 in each capacitive-reactance fusion unit are connected in series to form the overall reactor, and all the capacitor banks 302 are also connected in series to form as Figure 5The circuit shown. In this way, the reactor and capacitor in the self-resonant inductive pressure measurement test device with a capacitive reactance fusion structure can be connected in series resonance to self-boost the voltage, achieving the function of detecting the state of the test equipment itself. Since the resonance frequency is usually higher than the 50Hz power frequency during on-site tests, the capacitor in the self-resonant inductive pressure measurement test device with a capacitive reactance fusion structure also acts as a compensating capacitor, reducing the resonance frequency and making the resonance frequency closer to the 50Hz power frequency, which is beneficial for detecting the state of the test item.

[0030] In this embodiment, the capacitive reactance fusion unit 3 further includes an upper cover plate 307 and a lower cover plate 308, which facilitate filling dry air, dry nitrogen or insulating oil inside the capacitive reactance fusion unit 3 as needed.

[0031] In this embodiment, the upper and lower parts of the capacitor bank in any capacitive reactance fusion unit 3 are connected through internal connection wires 303 to form an equipotential.

[0032] In this embodiment, the device further includes a grading ring group 5, which is installed on the top of the uppermost capacitive reactance fusion unit 3 and functions to equalize the voltage and prevent corona generation.

[0033] In this embodiment, the external support cylinder 306 is cylindrical, the coil taps 304 between adjacent capacitive reactance fusion units 3 are connected by external connection wires 4, and the capacitor taps 305 between adjacent capacitive reactance fusion units 3 are also connected by external connection wires 4.

[0034] In this embodiment, the internal connection wire 303 is a flexible wire or a copper busbar.

[0035] In this embodiment, the number of capacitive reactance fusion units 3 is four.

Claims

1. A self-resonant inductance pressure measurement test device with a capacitive reactance fusion structure, characterized in that It includes a support base (1), an insulating support cylinder (2), and a multi - section capacitive - inductive fusion unit (3). The capacitive - inductive fusion units (3) are arranged end - to - end in the vertical direction. The capacitive - inductive fusion unit (3) includes an external support cylinder (306), a capacitor bank (302) and a coil (301) placed inside the external support cylinder (306). The coil (301) is located at the center of the external support cylinder (306). The capacitor bank (302) is arranged around the outside of the coil (301), between the coil (301) and the external support cylinder (306), and multiple capacitors are connected by internal connection wires (303). Coil taps (304) are led out from both the upper and lower ends of the coil (301), and capacitive taps (305) are led out from both the upper and lower ends of the capacitor bank (302). Among them, two coil taps (304) are led out from the lower end of the coil (301) of the lowermost capacitive - inductive fusion unit (3). The insulating support cylinder (2) is fixed on the support base (1), and the lowermost capacitive - inductive fusion unit (3) is fixed on the insulating support cylinder (2). The capacitive - inductive fusion unit (3) further includes an upper cover plate (307) and a lower cover plate (308). The upper and lower parts of the capacitor bank in any capacitive - inductive fusion unit (3) are connected by internal connection wires (303) to form an equipotential. The coil tap (304) at the upper end of the capacitive - inductive fusion unit (3) is connected to the coil tap (304) at the lower end of the upper capacitive - inductive fusion unit (3), and the capacitive tap (305) at the upper end of the capacitive - inductive fusion unit (3) is connected to the capacitive tap (305) at the lower end of the upper capacitive - inductive fusion unit (3). The coil taps (304) between adjacent capacitive - inductive fusion units (3) are connected by external connection wires (4), and the capacitive taps (305) between adjacent capacitive - inductive fusion units (3) are connected by external connection wires (4).

2. The self-resonant inductance pressure measurement test device with a capacitive reactance fusion structure according to claim 1, characterized in that The device further includes a grading ring group (5), and the grading ring group (5) is installed on the top of the uppermost capacitive - inductive fusion unit (3).

3. The self-resonant inductance pressure measurement test device with a capacitance-reactance fusion structure according to claim 1, characterized in that, The external support cylinder (306) is cylindrical.

4. The self-resonant inductance pressure measurement test device with a capacitance-reactance fusion structure according to claim 1, characterized in that, The inside of the capacitive - inductive fusion unit (3) is filled with dry air, dry nitrogen or insulating oil.

5. The self-resonant inductance pressure measurement test device with a capacitive reactance fusion structure according to claim 1, characterized in that, The internal connection wire (303) is a flexible wire or a copper busbar.

Images