A compact open-type composite electrical apparatus

Abstract

The present invention relates to the field of reactive power compensation devices for power systems, and particularly to a compact open-type combined electrical apparatus, which includes a plurality of combined single-pole structures. The single-pole structure includes a circuit breaker, a starting resistor, and a gas pressure sensor. The starting resistor is connected in parallel with the circuit breaker. The interior of the starting resistor is communicated with the gas chamber of the circuit breaker. The gas pressure sensor is arranged at the air inlet of the gas chamber, and the air inlet of the gas chamber is connected to the gas source of external insulating gas. In a compact open-type combined electrical apparatus of the present invention, by designing the starting resistor, the impact current generated instantaneously during the switching of SVG is reduced, ensuring the safety of the power grid and equipment. At the same time, the starting resistor is integrated with the pot-type circuit breaker and installed in a closed gas chamber, using gas insulation, so that the open-type combined electrical apparatus has better integration and integrity under the same configuration. The floor area is one-half of the original general existing structure, reducing the land area and facilitating the overall transportation.

Description

Technical Field

[0001] The present invention relates to the field of reactive power compensation devices for power systems, and particularly to a compact open-type combined electrical apparatus. Background Art

[0002] In an AC power supply system, inductors and capacitors are essential loads. When the reactive power demand in the power system increases, the power plant needs to increase the reactive power output by means of phase modulation, which reduces the output capacity of the generator. In order to reduce the reactive power supply pressure of the power plant, it is necessary to design and install a reactive power compensation device in the power supply system, that is, an SVG device.

[0003] Switches and protection need to be provided during the switching of the reactive power compensation device. When the SVG system starts, an impact current several times that of the normal value is instantaneously generated, which causes damage to the power grid and equipment. Therefore, a starting resistor needs to be set. Basically, an SVG compensation device will be set in a 35 kV substation. This SVG device generally needs to be equipped with equipment such as a circuit breaker, a lightning arrester, a starting resistor current transformer, a disconnector, and an earthing switch, which is similar to a small switchyard. In the prior art, an SVG switchyard equipped with a starting resistor generally adopts a combined product in which low-cost outdoor open-type equipment is combined together and is arranged in a "one"-shaped layout according to the requirements of the air insulation distance, as Figure 1 shown. This structure is simple and has a low cost, but the volume of a single open-type device is large. After the "one"-shaped layout, the volume of the combined product is large, the span is long, the floor area is large, and the overall transportation is difficult, which cannot meet the requirements of a switchyard with space requirements and good overall transportability, and is inconvenient to use and has limited scope. Therefore, there is a need for an open-type combined electrical apparatus with a very small floor area, outdoor operation, and a low cost and having the protection function of an SVG device. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the present invention provides a compact open-type combined electrical apparatus.

[0005] The present invention is realized through the following technical solutions:

[0006] A compact open-type combined electrical apparatus includes a plurality of combined single-pole structures. The single-pole structure includes a circuit breaker, a starting resistor, and a gas pressure sensor. The starting resistor is connected in parallel with the circuit breaker. The inside of the starting resistor is communicated with the gas chamber of the circuit breaker. The gas pressure sensor is arranged at the air inlet of the gas chamber. The air inlet of the gas chamber is connected to the gas source of the external insulating gas. The gas pressure sensor is used to monitor the pressure of the insulating gas in the gas chamber.

[0007] Preferably, the starting resistor includes a starting resistor housing, a moving-side component, a static-side component, and a starting resistor body. The starting resistor housing is installed on the circuit breaker housing, and the starting resistor housing communicates with the gas chamber of the circuit breaker; the starting resistor housing is columnar, the starting resistor body is disposed inside the starting resistor housing, the moving-side component and the static-side component are disposed at both ends of the starting resistor body, and both the moving-side component and the static-side component are connected to the circuit breaker.

[0008] Preferably, the moving-side component includes a moving-side sealing plate and a moving-side connecting conductor. The moving-side sealing plate is connected to one end of the starting resistor housing, one end of the moving-side connecting conductor is fixedly connected to the starting resistor body, and the other end is fixedly connected to the arc extinguishing chamber of the circuit breaker.

[0009] Preferably, the static-side component includes a static-side sealing plate, a static-side connecting conductor, and a static-side electrical connection. The static-side sealing plate is connected to the other end of the starting resistor housing, one end of the static-side connecting conductor is fixedly connected to the starting resistor body, the other end is slidably connected to the static-side electrical connection, and the static-side electrical connection is fixedly connected to the arc extinguishing chamber of the circuit breaker.

[0010] Preferably, the fingers of the static-side electrical connection are spring fingers, watchband fingers, or finger-shaped fingers.

[0011] Preferably, the starting resistor further includes an insulating support. One end of the insulating support is fixed inside the starting resistor housing, and the other end is slidably connected to the static-side connecting conductor.

[0012] Preferably, the starting resistor further includes a support mounting plate. The support mounting plate is fixedly installed inside the starting resistor housing, and one end of the insulating support is fixedly connected to the support mounting plate.

[0013] Preferably, a first interface is provided on the starting resistor housing, and a second interface is provided on the circuit breaker housing of the circuit breaker. The first interface is connected to the second interface.

[0014] Preferably, at least one air pressure sensor is provided.

[0015] Preferably, the circuit breaker is a tank-type circuit breaker.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In a compact open-type combined electrical apparatus of the present invention, by designing a starting resistor, the impact current generated instantaneously during SVG switching is reduced, ensuring the safety of the power grid and equipment. At the same time, the starting resistor is integrated with a tank-type circuit breaker and installed in a closed gas chamber, using gas insulation, so that the open-type combined electrical apparatus has better integration and integrity under the same configuration. The floor area is one-half of the original general existing structure, reducing the land area and facilitating overall transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic diagram of an existing open-type device arranged in a straight line;

[0019] Figure 2 FIG. 2 is a schematic diagram of a compact open-type combined electrical apparatus of the present invention;

[0020] Figure 3 FIG. 3 is an assembly schematic diagram of a starting resistor of a compact open-type combined electrical apparatus of the present invention.

[0021] In the figures: 1, outgoing conductor; 2, outgoing bushing; 3, current transformer; 4, three-position isolating earthing switch; 5, circuit breaker; 51, circuit breaker housing; 52, moving-side connecting conductor of circuit breaker; 53, moving side of arc extinguishing chamber; 54, static-side connecting conductor of circuit breaker; 55, static side of arc extinguishing chamber; 6, starting resistor; 61, moving-side sealing plate; 62, starting resistor housing; 63, moving-side connecting conductor; 64, starting resistor body; 65, static-side connecting conductor; 66, insulating support; 67, support mounting plate; 68, static-side sealing plate; 69, static-side electrical connection; 7, gas pressure sensor; 8, chassis; 9, support; 10, live display; 11, lightning arrester; 12, LPC control cabinet; 13, circuit breaker operating mechanism; 14, three-position operating mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0022] The following further describes the present invention in detail with reference to specific embodiments, which are explanations rather than limitations of the present invention.

[0023] The present invention discloses a compact open-type combined electrical apparatus. Referring to Figure 2 FIG. 2, it includes a plurality of combined single-pole structures. The single-pole structure includes a circuit breaker 5, a starting resistor 6, a gas pressure sensor 7, an outgoing conductor 1, an outgoing bushing 2, a current transformer 3, a three-position isolating earthing switch 4, a chassis 8, a support 9, an LPC control cabinet 12, a circuit breaker operating mechanism 13, and a three-position operating mechanism 14. Secondly, a live display 10 and a lightning arrester 11 can also be configured.

[0024] Referring to Figure 3 FIG. 2, the circuit breaker 5 is a tank-type circuit breaker, including a circuit breaker housing 51, a moving-side connecting conductor 63 of the circuit breaker, a moving side 53 of the arc extinguishing chamber, a static-side connecting conductor 65 of the circuit breaker, and a static side 55 of the arc extinguishing chamber. Both the moving side 53 and the static side 55 of the arc extinguishing chamber are provided with two interfaces.

[0025] The outgoing conductor 1 is installed inside the outgoing bushing 2. The outgoing bushing 2 is fixedly installed on the current transformer 3 by screws. The current transformer 3 is fixedly installed on the isolating earthing switch three-position 4 by screws. The isolating earthing switch three-position 4 is fixedly installed on the circuit breaker 5 by screws. The circuit breaker 5 is fixedly installed on the bracket 9 by screws. The bracket 9 is fixedly installed on the chassis 8. The height of the overall combined electrical apparatus is adjusted by the chassis 8. The circuit breaker operating mechanism 13 is fixedly installed on the moving side end face of the circuit breaker 5 by screws. The isolating earthing switch three-position 4 is fixedly installed on the bracket 9 and is arranged on the side of the circuit breaker housing 51. The drive system of the isolating earthing switch three-position 4 is arranged in the middle of each pole of the isolating earthing switch three-position 4. The LCP control cabinet 12 is suspended on the bracket 9. Among them, the up-and-down positions of the current transformer 3 and the isolating earthing switch three-position 4 can be interchanged.

[0026] Isolating earthing switch three-position 4 and current transformer 3 can be configured on both sides of each pole of the circuit breaker 5. At the same time, according to the transportation situation and project requirements, etc., the angle A between the two side phases can be adjusted between 0° and 20°.

[0027] The starting resistor 6 is connected in parallel with the circuit breaker 5. The starting resistor 6 includes a starting resistor housing 62, a moving side assembly, a static side assembly, a starting resistor body 64, an insulating support 66 and a support mounting plate 67. The starting resistor housing 62 is installed on the circuit breaker housing 51. The starting resistor housing 62 is communicated with the gas chamber of the circuit breaker 5. The starting resistor housing 62 is provided with a first interface, and the circuit breaker housing 51 is provided with a second interface. The first interface is connected to the second interface, so as to realize the communication between the starting resistor housing 62 and the circuit breaker housing 51, and further realize the communication between the starting resistor housing 62 and the gas chamber of the circuit breaker 5. Both the first interface and the second interface are provided with two. Sealing structures, such as O-ring seals, are provided at the contact surfaces of the first interface and the second interface.

[0028] At least one air pressure sensor 7 is provided. The air pressure sensor 7 is arranged at the air inlet of the gas chamber. The air inlet of the gas chamber is connected to the gas source of the external insulating gas. The air pressure sensor 7 is used to monitor the pressure of the insulating gas in the gas chamber.

[0029] Two outlets are also provided at the upper end of the circuit breaker housing 51 for connecting the current transformer 3.

[0030] The starting resistor housing 62 is columnar. The starting resistor body 64 is arranged inside the starting resistor housing 62. The moving side assembly and the static side assembly are arranged at both ends of the starting resistor body 64.

[0031] The moving-side assembly includes a moving-side sealing plate 61 and a moving-side connecting conductor 63. The moving-side sealing plate 61 is connected to one end of the starting resistor housing 62 by screws. A sealing structure is provided between the contact surface of the moving-side sealing plate 61 and the starting resistor housing 62. One end of the moving-side connecting conductor 63 is fixedly connected to the starting resistor body 64, and the other end is fixedly connected to the arc extinguishing chamber of the circuit breaker 5.

[0032] The static-side assembly includes a static-side sealing plate 68, a static-side connecting conductor 65, and a static-side electrical connection 69. The static-side sealing plate 68 is connected to the other end of the starting resistor housing 62 by screws. A sealing structure is provided between the contact surface of the static-side sealing plate 68 and the starting resistor housing 62. One end of the static-side connecting conductor 65 is fixedly connected to the starting resistor body 64, and the other end is slidably connected to the static-side electrical connection 69. The static-side electrical connection 69 is fixedly connected to the arc extinguishing chamber of the circuit breaker 5.

[0033] The fingers of the static-side electrical connection 69 are spring fingers, strap fingers, or finger-shaped fingers. The static-side electrical connection 69 can be an external contact connection or an internal contact connection.

[0034] Both the static side and the moving side of the arc extinguishing chamber are provided with two interfaces. When the moving-side connecting conductor 63 is connected to the moving side 53 of the arc extinguishing chamber, the static-side electrical connection 69 is connected to the static side 55 of the arc extinguishing chamber. The specific connection structure is as follows: One interface of the moving-side connecting conductor 63 is fixedly connected to one interface of the moving side 53 of the arc extinguishing chamber; The other interface of the moving side 53 of the arc extinguishing chamber is fixedly or slidably connected to the lower conductor of the isolating earthing switch three-position 4 through the moving-side connecting conductor 52 of the circuit breaker.

[0035] One interface of the static-side electrical connection 69 is fixedly connected to one interface of the static side 55 of the arc extinguishing chamber, and the other interface of the static side 55 of the arc extinguishing chamber is fixedly or slidably connected to the lower conductor of the isolating earthing switch three-position 4 through the static-side connecting conductor 54 of the circuit breaker.

[0036] When the moving-side connecting conductor 63 is connected to the static side 55 of the arc extinguishing chamber, the static-side electrical connection 69 is connected to the moving side 53 of the arc extinguishing chamber. The specific connection structure is as follows: One interface of the moving-side connecting conductor 63 is fixedly connected to one interface of the static side of the arc extinguishing chamber, and the other interface of the static side 55 of the arc extinguishing chamber is fixedly or slidably connected to the lower conductor of the isolating earthing switch three-position 4 through the static-side connecting conductor 54 of the circuit breaker.

[0037] One interface of the static-side electrical connection 69 is fixedly connected to one interface of the moving side 53 of the arc extinguishing chamber, and the other interface of the moving side 53 of the arc extinguishing chamber is fixedly or slidably connected to the lower conductor of the isolating earthing switch three-position 4 through the moving-side connecting conductor 52 of the circuit breaker.

[0038] One end of the insulating support 66 is fixed inside the starting resistor housing 62 through the insulating support 66 plate, and the other end is slidably connected to the static-side connecting conductor 65. The support mounting plate 67 is fixed to the inside of the starting resistor 6 by screws.

[0039] The above are only the preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solutions can be subject to several simple modifications and substitutions, and these modifications and substitutions also fall within the protection scope covered by the claims.

Claims

1. A compact open-type combined electrical apparatus, characterized in that, Comprising a plurality of combined and connected monopole structures, the monopole structures include an outgoing conductor (1), an outgoing bushing (2), a current transformer (3), a three-position isolating earthing switch (4), a circuit breaker (5), a starting resistor (6) and a gas pressure sensor (7). The starting resistor (6) is connected in parallel with the circuit breaker (5). The interior of the starting resistor (6) communicates with the gas chamber of the circuit breaker (5). The gas pressure sensor (7) is arranged at the air inlet of the gas chamber. The air inlet of the gas chamber is connected to the gas source of the external insulating gas. The gas pressure sensor (7) is used to monitor the pressure of the insulating gas in the gas chamber; The starting resistor (6) includes a starting resistor housing (62), a moving-side component, a static-side component and a starting resistor body (64). The starting resistor housing (62) is installed on the circuit breaker housing (51), and the starting resistor housing (62) communicates with the gas chamber of the circuit breaker (5); The starting resistor housing (62) is columnar. The starting resistor body (64) is arranged inside the starting resistor housing (62). The moving-side component and the static-side component are arranged at both ends of the starting resistor body (64), and both the moving-side component and the static-side component are connected to the circuit breaker (5); The moving-side component includes a moving-side sealing plate (61) and a moving-side connecting conductor (63). The moving-side sealing plate (61) is connected to one end of the starting resistor housing (62). One end of the moving-side connecting conductor (63) is fixedly connected to the starting resistor body (64), and the other end is fixedly connected to the moving side (53) of the arc extinguishing chamber of the circuit breaker (5); The static-side component includes a static-side sealing plate (68), a static-side connecting conductor (65) and a static-side electrical connection (69). The static-side sealing plate (68) is connected to the other end of the starting resistor housing (62). One end of the static-side connecting conductor (65) is fixedly connected to the starting resistor body (64), and the other end is slidably connected to the static-side electrical connection (69). The static-side electrical connection (69) is fixedly connected to the static side (55) of the arc extinguishing chamber of the circuit breaker (5); A first interface is provided on the starting resistor housing (62), and a second interface is provided on the circuit breaker housing (51). The first interface is connected to the second interface, so as to realize the communication between the starting resistor housing (62) and the circuit breaker housing (51), and further realize the communication between the starting resistor housing (62) and the gas chamber of the circuit breaker (5); The circuit breaker (5) is a tank-type circuit breaker, including a circuit breaker housing (51), a circuit breaker moving-side connecting conductor (52), a moving side (53) of the arc extinguishing chamber, a circuit breaker static-side connecting conductor (54) and a static side (55) of the arc extinguishing chamber. Two interfaces are provided on both the moving side (53) and the static side (55) of the arc extinguishing chamber; When the moving-side connecting conductor (63) is connected to the moving side (53) of the arc extinguishing chamber, the static-side electrical connection (69) is connected to the static side (55) of the arc extinguishing chamber; The specific connection structure is as follows: One interface of the moving-side connecting conductor (63) is fixedly connected to the moving side (53) of the arc extinguishing chamber; The other interface of the moving side (53) of the arc extinguishing chamber is fixedly or slidably connected to the lower conductor of the three-position isolating earthing switch (4) through the circuit breaker moving-side connecting conductor (52); The static-side electrical connection (69) is fixedly connected to an interface of the static side of the arc extinguishing chamber (55), and the other interface of the static side of the arc extinguishing chamber (55) is fixedly or slidably connected to the lower conductor of the isolating earthing switch three-position (4) through the static-side connection conductor (54) of the circuit breaker. When the moving-side connection conductor (63) is connected to the static side of the arc extinguishing chamber (55), the static-side electrical connection (69) is connected to the moving side of the arc extinguishing chamber (53); the specific connection structure is as follows: the moving-side connection conductor (63) is fixedly connected to an interface of the static side of the arc extinguishing chamber, and the other interface of the static side of the arc extinguishing chamber (55) is fixedly or slidably connected to the lower conductor of the isolating earthing switch three-position (4) through the static-side connection conductor (54) of the circuit breaker. The static-side electrical connection (69) is fixedly connected to an interface of the moving side of the arc extinguishing chamber (53), and the other interface of the moving side of the arc extinguishing chamber (53) is fixedly or slidably connected to the lower conductor of the isolating earthing switch three-position (4) through the moving-side connection conductor (52) of the circuit breaker.

2. The compact open-type combined electrical apparatus according to claim 1, characterized in that The finger contacts of the static-side electrical connection (69) are spring finger contacts, watchband finger contacts or finger-shaped finger contacts.

3. The compact open-type combined electrical apparatus according to claim 1, wherein The starting resistor (6) further includes an insulating support (66), one end of the insulating support (66) is fixed inside the starting resistor housing (62), and the other end is slidably connected to the static-side connection conductor (65).

4. The compact open-type combined electrical apparatus according to claim 3, characterized in that The starting resistor (6) further includes a support mounting plate (67), the support mounting plate (67) is fixedly installed inside the starting resistor housing (62), and one end of the insulating support (66) is fixedly connected to the support mounting plate (67).

5. The compact open-type combined electrical apparatus according to claim 1, characterized in that, A first interface is provided on the starting resistor housing (62), a second interface is provided on the circuit breaker housing (51) of the circuit breaker (5), and the first interface is connected to the second interface.

6. The compact open-type combined electrical apparatus according to claim 1, wherein, At least one air pressure sensor (7) is provided.

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