Combined electric appliance comprehensive detection device

Abstract

The invention relates to a combined electric appliance comprehensive detection device which comprises a combined electric appliance interval body, the combined electric appliance interval body is connected with a first common-box main bus, the first common-box main bus is connected with a second common-box main bus, and the second common-box main bus is connected with a third common-box main bus. An angle type isolation grounding switch is connected between the second common-box main bus and the third common-box main bus, the angle type isolation grounding switch is connected with an isolation mechanism and a grounding mechanism, the angle type isolation grounding switch is connected with one end of a branch bus straight tube, the other end of the branch bus straight tube is connected with a calibrator, and the calibrator is connected with a voltage booster. The device has the advantages that voltage-withstanding phase sequence conversion is achieved through opening and closing of the angle type disconnecting switch, under the condition that the voltage-withstanding state of the combined electric appliance is guaranteed, the partial discharge value of the whole interval is analyzed through the partial discharge collector, whether the partial discharge value meets the factory standard or not is judged, and the device is suitable for combined electric appliances in a double-bus or single-bus wiring mode.

Description

(1) Technical field The invention belongs to the technical field of electric switchgear electrical testing, and in particular relates to a combined electrical appliance comprehensive detection device. (2) Background Technology With the continuous improvement of living standards, people's demands for a higher quality of life are increasing, placing higher demands on the quality and reliability of power grid equipment. Compared to traditional equipment, switchgear features a high degree of modularity, a compact structure, and a high insulation margin. Their housings are constructed of high-quality seamless aluminum tubes, and the conductors and insulation components are enclosed in a sealed cavity, making them less susceptible to environmental factors and offering exceptional reliability. Switchgear plays a crucial role in connecting 220kV transmission and transformation lines within the power grid. Before shipment, switchgear undergoes lightning surge, power frequency withstand voltage, partial discharge (PD) testing, and mechanical property testing. Insulation testing can detect defects in the internal insulation of switchgear. While the energy of a single PD is small, it does not directly impact the insulation strength of electrical equipment. However, over long-term operation, PD can gradually expand and produce undesirable compounds, gradually damaging the insulation. Over time, this can eventually lead to insulation breakdown, causing sudden equipment failure. 252kV switchgear employs a three-phase common-chamber main busbar structure, with the circuit breaker and busbar in separate compartments. Detecting PD while simultaneously performing power frequency withstand voltage testing has become a pressing issue. (3) Summary of the invention In order to make up for the deficiencies of the prior art, the present invention provides a combined electrical appliance comprehensive detection device which has a simple structure, accurate detection and a wide range of applications.

[0004] The present invention is achieved through the following technical solutions: A comprehensive detection device for a combination electrical appliance comprises a combination electrical appliance interval body, the combination electrical appliance interval body being connected to a first common box main bus, the first common box main bus being connected to a second common box main bus, and the second common box main bus being connected to a third common box main bus, and characterized in that: an angle-type isolating and grounding switch is connected between the second common box main bus and the third common box main bus, the angle-type isolating and grounding switch is connected to an isolating mechanism and a grounding mechanism, the angle-type isolating and grounding switch is connected to one end of a branch bus straight tube, the other end of the branch bus straight tube is connected to a calibrator, and the calibrator is connected to a booster.

[0005] A first three-way air chamber is connected between the angle-type isolating grounding switch and the third common box main bus, and a second three-way air chamber is connected between the calibrator and the booster.

[0006] A main busbar without insulator is connected between the first common box main busbar and the second common box main busbar.

[0007] The combination electrical appliance spacing body is internally connected to the spacing body 1 female and the spacing body 2 female.

[0008] The beneficial effects of the present invention are as follows: By operating the platform, the current and voltage values required for the withstand voltage of the combined electrical apparatus are adjusted. The conversion of the withstand voltage phase sequence is achieved by opening and closing the angular disconnecting switch. Under the condition of ensuring the withstand voltage of the combined electrical apparatus, the partial discharge values of the entire interval are analyzed by the partial discharge collector to determine whether they meet the factory standards. It is applicable to the combined electrical apparatus with double-bus and single-bus wiring forms. (IV) BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be further described below in conjunction with the drawings.

[0010] Appendix Figure 1 is the front view structural schematic diagram of the present invention; Appendix Figure 2 is the side view structural schematic diagram of the present invention; In the figure, 1 is the combined electrical apparatus interval body, 2 is the first common box main bus, 3 is the second common box main bus, 4 is the third common box main bus, 5 is the angular isolating earthing switch, 6 is the isolating mechanism, 7 is the earthing mechanism, 8 is the branch bus straight tube, 9 is the calibrator, 10 is the booster, 11 is the first three-way air chamber, 12 is the second three-way air chamber, 13 is the insulator with non-connected main bus, 14 is the bus 1 of the interval body, and 15 is the bus 2 of the interval body. (V) SPECIFIC EMBODIMENTS The attached drawing is a specific embodiment of the present invention. This embodiment includes the combined electrical apparatus interval body 1. The combined electrical apparatus interval body 1 is connected to the first common box main bus 2. The first common box main bus 2 is connected to the second common box main bus 3. The second common box main bus 3 is connected to the third common box main bus 4. An angular isolating earthing switch 5 is connected between the second common box main bus 3 and the third common box main bus 4. The angular isolating earthing switch 5 is connected to the isolating mechanism 6 and the earthing mechanism 7. One end of the angular isolating earthing switch 5 is connected to the branch bus straight tube 8, and the other end of the branch bus straight tube 8 is connected to the calibrator 9. The calibrator 9 is connected to the booster 10. A first three-way air chamber 11 is connected between the angular isolating earthing switch 5 and the third common box main bus 4. A second three-way air chamber 12 is connected between the calibrator 9 and the booster 10. An insulator with non-connected main bus 13 is connected between the first common box main bus 2 and the second common box main bus 3. The interval body 1 mother 14 and the interval body 2 mother 15 are connected inside the combined electrical apparatus interval body 1.

[0012] The combined electrical apparatus comprehensive detection device of the present invention adopts a structure in which the main busbars are of the same phase and the remaining three phases are of a split-box structure. The main components include: a voltage booster 10, a three-way gas chamber, a calibrator 9, a straight branch busbar 8, an angular isolating earthing switch 5, an isolating operating mechanism, an earthing operating mechanism, a coaxial main busbar, a non-through insulator 13 of the main busbar, an internal conductor, etc. The voltage is increased by the voltage booster 10, and the calibrator 9 is installed on the tapping port of the second three-way gas chamber 12. Each gas chamber is connected through non-through hole insulators and is separately equipped with a density relay to ensure that the leakage or maintenance of one gas chamber does not affect the normal operation of other gas chambers. The conductor is enclosed in a sealed cavity through the three-way gas chamber and the main busbar gas chamber. Since the combined electrical apparatus adopts a structure in which the main busbars are of the same phase and the remaining three phases are of a split-box structure, and the withstand voltage is the single-phase withstand voltage, the coaxial main busbar needs to be converted into a split-phase structure through a tee and a straight tube to achieve the single-phase withstand voltage. For the butt joint interval main busbar, the split-phase structure needs to be converted into a coaxial structure to achieve the butt joint with the combined electrical apparatus interval body 1. The angular isolating earthing switch 5 is adopted, and an independent single-phase isolating mechanism 6 and an earthing mechanism 7 are configured to achieve the single-phase withstand voltage. At the same time, in cooperation with the partial discharge detection device, the partial discharge measurement is realized while the interval is under withstand voltage. When the combined electrical apparatus interval body 1 is under withstand voltage, the busbar 14 of the interval body 1 is butted to the comprehensive monitoring device, and the isolating switch on the monitoring device side is closed or opened according to the phase sequence required for the test to achieve the withstand voltage and partial discharge measurement of the entire interval.

Claims

1. A combined electrical apparatus comprehensive detection device, comprising a combined electrical apparatus bay body (1), the combined electrical apparatus bay body (1) is connected to a first common enclosure main busbar (2), the first common enclosure main busbar (2) is connected to a second common enclosure main busbar (3), and the second common enclosure main busbar (3) is connected to a third common enclosure main busbar (4), characterized in that: A corner-type isolating earthing switch (5) is connected between the second common-box main busbar (3) and the third common-box main busbar (4). The corner-type isolating earthing switch (5) is connected to an isolating mechanism (6) and an earthing mechanism (7). One end of the corner-type isolating earthing switch (5) is connected to a branch busbar straight tube (8), the other end of the branch busbar straight tube (8) is connected to a calibrator (9), and the calibrator (9) is connected to a step-up transformer (10).

2. The combined electrical apparatus comprehensive detection device according to claim 1, wherein: A first three-way gas chamber (11) is connected between the corner-type isolating earthing switch (5) and the third common-box main busbar (4). A second three-way gas chamber (12) is connected between the calibrator (9) and the step-up transformer (10).

3. The combined electrical apparatus comprehensive detection device according to claim 1, characterized in that: A main busbar non-through insulator (13) is connected between the first common-box main busbar (2) and the second common-box main busbar (3).

4. The combined electrical apparatus comprehensive detection device according to claim 1, characterized in that: A section body 1 busbar (14) and a section body 2 busbar (15) are connected inside the combined electrical apparatus section body (1).

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