CN115719930A - Removable air insulation switch cabinet - Google Patents

Abstract

The invention discloses a removable air-insulated switch cabinet in the field of switch cabinets, which comprises a cabinet main frame; the cabinet main frame is provided with a circuit breaker room; the circuit breaker room is provided with the removable circuit breaker; the two contact arms on the removable circuit breaker are respectively used to connect the first contact box and the second contact box; the cable is connected to one end of the tubular lower branch busbar, and the The other end of the tubular lower branch busbar is connected to the first contact box; the tubular upper branch busbar is arranged in the busbar chamber; one end of the tubular upper branch busbar is electrically connected to the second contact box; the The other end of the tubular upper branch busbar is connected to the tubular main busbar; the radius of the tubular branch busbar in the present invention is much larger than the fillet radius of the rectangular branch busbar in the prior art, which improves the insulation performance of the switchgear. The low skin coefficient reduces the calorific value of the switchgear and reduces the temperature rise of the switchgear.

Description

A removable air-insulated switchgear

technical field

The invention belongs to the technical field of switch cabinets, and in particular relates to a removable air-insulated switch cabinet.

Background technique

Removable air-insulated switchgear is a complete set of indoor power distribution equipment, mainly used for power transmission of small and medium-sized generators, power receiving and transmission of secondary substations in power systems, power distribution of industrial and mining enterprises and institutions, and large-scale high-voltage motors. start etc. In recent years, users have put forward higher requirements on the temperature rise and insulation level of the removable air-insulated switchgear. The original structure uses rectangular branch busbars, which is difficult to meet these requirements. In terms of temperature rise, the switchgear with a current of 2500A and above adopts the superposition method of rectangular busbars. The additional coefficient of AC resistance caused by the skin effect is large, the heat generation is large, and the temperature rise is easy to exceed the standard; in terms of insulation, the radius of the rounded corners of the rectangular busbars is smaller Small, when the rated voltage rises to a higher voltage such as 40.5kV, there will inevitably be continuous partial discharge at the rounded corners of the rectangular branch bus, which will affect the insulation performance of the switchgear and reduce the reliability of the switchgear.

Contents of the invention

The purpose of the present invention is to provide a removable air-insulated switchgear, which reduces the calorific value of the switchgear, lowers the temperature rise of the switchgear, and improves the insulation level of the switchgear.

In order to achieve the above object, on the one hand the technical solution adopted in the present invention is:

A removable air-insulated switchgear, comprising a main frame of the cabinet; the main frame of the cabinet is provided with a circuit breaker room, a cable room and a busbar room; a second A contact box; a second contact box is provided between the circuit breaker room and the busbar room; the removable circuit breaker is provided in the circuit breaker room; Two contact arms, the two contact arms are respectively used to connect the first contact box and the second contact box;

A cable is provided in the cable chamber; the cable is connected to one end of the tubular lower branch busbar, and the other end of the tubular lower branch busbar is connected to the first contact box; the tubular upper branch busbar is arranged in the busbar chamber ; One end of the tubular upper branch busbar is electrically connected to the second contact box; the other end of the tubular upper branch busbar is connected to the tubular main busbar.

Preferably, the tubular lower branch busbar and the tubular upper branch busbar are provided with bending angles, and the bending angles are set as rounded corners.

Preferably, the first contact box is fixed on the main frame of the cabinet; the tubular lower branch busbar is fixed on the first contact box through a fixing flange; the movable circuit breaker and The tubular lower branch busbars are connected through the plum-blossom contacts of the circuit breaker.

Preferably, the second contact box is fixedly arranged on the main frame of the cabinet; the tubular upper branch busbar is fixed on the second contact box through a fixing flange; the movable circuit breaker and The tubular upper branch busbars are connected through the plum-blossom contacts of the circuit breaker.

Preferably, a plurality of tubular upper branch buses are arranged in the busbar chamber; between a plurality of tubular main busbars is arranged on the main frame of the cabinet; One to one corresponding setting.

Preferably, the main frame of the cabinet is provided with a busbar bushing; the tubular main busbar passes through the busbar bushing; the tubular main busbar and the tubular upper branch busbar are connected by a double-pipe connector connect.

Preferably, the cable is connected to the tubular lower branch bus bar through a single tubular connector; the single tubular connector is connected to a grounding switch; and the grounding switch is arranged on the side wall of the main frame of the cabinet.

Preferably, a core-through current transformer can be arranged on the tubular lower branch bus.

Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

In the present invention, a cable is provided in the cable chamber; the cable is connected to one end of the tubular lower branch bus, and the other end of the tubular lower branch bus is connected to the first contact box; a tubular Upper branch busbar; one end of the tubular upper branch busbar is electrically connected to the second contact box; the other end of the tubular upper branch busbar is connected to the tubular main busbar; the tubular upper branch busbar and the tubular lower branch The radius of the busbar is much larger than the fillet radius of the rectangular branch busbar in the prior art, which improves the partial discharge inception voltage of the conductor, optimizes the insulation performance of the switchgear, avoids the excessive additional coefficient of AC resistance caused by the skin effect, and reduces the The calorific value of the switch cabinet is reduced, and the temperature rise of the switch cabinet is reduced.

Description of drawings

Fig. 1 is a front view of a removable air-insulated switchgear provided by the present invention;

Fig. 2 is a side view of a removable air-insulated switchgear provided by the present invention;

Fig. 3 is a partial enlarged view of the second contact box provided by the present invention;

In the figure: 1. The main frame of the cabinet; 2. The removable circuit breaker; 3. The circuit breaker room; 4. Double-pipe connector; 5. Bus bushing; Flange; 8. Second contact box; 9. Busbar room; 10. Cable room; 11. Grounding switch; 12. Tube type lower branch busbar; 13. Single tube type connector; 14. Cable; 15. Tube type Main busbar; 16, cabinet door; 17, plum blossom contact; 18, contact arm; 19, first contact box.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

It should be noted that, in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer" and the like indicate orientations or positions The relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and does not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. The terms "front", "rear", "left", "right", "upper" and "lower" used in the description of the present invention refer to the directions in the drawings, and the terms "inner" and "outer" refer to is the direction towards or away from the geometric center of a particular part.

As shown in Figures 1 to 3, a removable air-insulated switchgear includes a cabinet main frame 1; an instrument room is provided on the upper part of the cabinet main frame; a circuit breaker is provided on the cabinet main frame 1 Room 3, cable room 10 and busbar room 9; the opening of the cable room is provided with a cabinet door 16; a first contact box 19 is provided between the circuit breaker room 3 and the cable room 10; the circuit breaker A second contact box 8 is arranged between the breaker chamber 3 and the busbar chamber 9; the removable circuit breaker 2 is arranged in the circuit breaker chamber 3; 18 contact arms.

The cable chamber 10 is provided with a cable 14; the cable 14 is connected to one end of the tubular lower branch busbar 12, and the other end of the tubular lower branch busbar 12 is connected to the first contact box 19; the first The contact box 19 is fixedly arranged on the cabinet main frame 1; the tubular lower branch busbar 12 is fixed on the first contact box 19 through the fixing flange 7; the tubular lower branch busbar 12 and The contact arms 18 of the removable circuit breaker 2 are connected by tulip contacts 17 .

The cable 14 is connected to the tubular lower branch busbar 12 through a single tubular connector 13; the single tubular connector 13 is connected to the grounding switch 11; the grounding switch 11 is arranged on the side of the cabinet main frame 1 On the wall; the lower branch busbar 12 is equipped with a core-through current transformer.

The bus chamber 9 is provided with a tubular upper branch bus 6; one end of the tubular upper branch bus 6 is connected to the tubular main bus 15; the other end of the tubular upper branch bus 6 is electrically connected to the second A contact box 8; the second contact box 8 is fixedly arranged on the cabinet main frame 1; the tubular upper branch busbar 6 is fixed on the second contact box 8 through a fixing flange 7; The contact arm 18 of the removable circuit breaker 2 is connected to the tubular upper branch bus 6 through a tulip contact 17 .

The main frame 1 of the cabinet body is provided with a busbar bushing 5; the tubular main busbar 15 passes through the busbar bushing 5; the tubular main busbar 15 is connected to the tubular upper branch busbar 6 through a double-pipe type Head 4 connections.

The bus chamber 9 is provided with a plurality of tubular upper branch bus bars 6; the cabinet main frame 7 is provided with a plurality of tubular main bus bars 15; the tubular upper branch bus bars 6 are connected with the tubular main bus bars 15 are set in one-to-one correspondence; the tube-shaped lower branch bus 12 and the tube-shaped upper branch bus 6 are provided with a bending angle, the bending angle is greater than or equal to 90 degrees, and the bending angle is set as a rounded corner; the radius of the tube-shaped branch bus is large Compared with the fillet radius of the rectangular branch busbar in the prior art, the partial discharge initial voltage of the busbar is improved, the insulation performance of the switchgear is optimized, the calorific value of the switchgear is reduced, and the temperature rise of the switchgear is reduced.

The above is only a preferred embodiment of the present invention, and it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims (8)

1. A removable air-insulated switchgear, characterized in that it includes a cabinet main frame; the cabinet main frame is provided with a circuit breaker room, a cable room and a bus bar room; the circuit breaker room and the cable A first contact box is arranged between the chambers; a second contact box is arranged between the circuit breaker chamber and the busbar chamber; the removable circuit breaker is arranged in the circuit breaker chamber; the removable There are two contact arms on the type circuit breaker, and the two contact arms are respectively used to connect the first contact box and the second contact box; A cable is provided in the cable chamber; the cable is connected to one end of the tubular lower branch busbar, and the other end of the tubular lower branch busbar is connected to the first contact box; the tubular upper branch busbar is arranged in the busbar chamber ; One end of the tubular upper branch busbar is electrically connected to the second contact box; the other end of the tubular upper branch busbar is connected to the tubular main busbar. 2. A removable air-insulated switchgear according to claim 1, wherein the tubular lower branch busbar and the tubular upper branch busbar are provided with bending angles, and the bending angles are rounded. 3. A removable air-insulated switchgear according to claim 1, wherein the first contact box is fixed on the main frame of the cabinet; the tubular lower branch busbar passes through The fixed flange is fixed on the first contact box; the movable circuit breaker is connected to the tubular lower branch busbar through the plum blossom contact of the circuit breaker. 4. A removable air-insulated switchgear according to claim 1, wherein the second contact box is fixedly arranged on the main frame of the cabinet; the tubular upper branch busbar passes through The fixed flange is fixed on the second contact box; the movable circuit breaker is connected to the tubular upper branch bus bar through the plum blossom contact of the circuit breaker. 5. A removable air-insulated switchgear according to claim 1, characterized in that, the busbar chamber is provided with a plurality of tubular upper branch busbars; the main frame of the cabinet is provided with a plurality of tubular Between the main busbars of the tubular type; the upper branch busbars of the tubular type are arranged in one-to-one correspondence with the main busbars of the tubular type. 6. A removable air-insulated switchgear according to claim 1, characterized in that, the main frame of the cabinet is provided with a busbar bushing; the tubular main busbar passes through the busbar bushing ; The tube-type main busbar is connected to the tube-type upper branch busbar through a double-tube connector. 7. A removable air-insulated switchgear according to claim 1, wherein the cable is connected to the tubular lower branch busbar through a single-pipe connector; the single-pipe connector It is connected with the grounding switch; the grounding switch is arranged on the side wall of the main frame of the cabinet. 8. A removable air-insulated switchgear according to claim 1, wherein a core-through current transformer is arranged on the tubular lower branch bus.

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