CN107611783A - The back-to-back arrangement of brace type bus - Google Patents

Abstract

The invention discloses a kind of back-to-back arrangement of brace type bus.The technical solution adopted by the present invention is：The back-to-back arrangement of brace type bus, including vertically disposed steel pipe pole, horizontally disposed horizontal cross-arm, horizontal bus rod and main bus-bar, the both sides of the steel pipe pole are using three layers of horizontal cross-arm different in size of setting, and set the support insulator of bus respectively in horizontal cross arm end in back-to-back fashion；The support insulator arranges that described bus rod is arranged in the side of steel pipe pole by support insulator ladder perpendicular to horizontal cross-arm, and main bus-bar is arranged in the opposite side of steel pipe pole by support insulator ladder.The bus of conventional levels arrangement is optimized for the bus of back-to-back upper, middle and lower brace type step arrangement by the present invention, avoid in the case where being arranged vertically, it is adjacent alternate to cause the situation of phase fault to occur because of water column in sleety weather, and reduce under horizontal steps arrangement, bus is to insulator or the active force of framework.

Description

Supported busbar back-to-back layout structure

technical field

The invention relates to an arrangement structure and frame of electric equipment, in particular to a back-to-back arrangement structure of a supporting bus bar.

Background technique

The low-voltage side of the currently operating 500kV main transformer adopts a single-bus connection method; considering the reliability of the bus installation method, the bus generally adopts a horizontal arrangement. In order to improve the reliability of the low-voltage side wiring of the main transformer, it is required to set the main circuit breaker for multiple operations.

If a main circuit breaker is installed on the low-voltage side of the main transformer, its wiring mode will be changed from a single busbar connection to a combination of a busbar and a main busbar. Considering the safety net distance when the converging busbar and the main busbar are not powered off for maintenance at the same time, and the phase spacing of the horizontal layout of the busbar, the conventional horizontal layout will increase the area of the substation, which cannot meet the site restriction requirements in the general design, and is also inconsistent with land conservation. Contradictory ideas.

At present, there are three types of busbars commonly used in outdoor open power distribution devices: soft busbars, suspended tube busbars and supported tube busbars. The soft busbar has good seismic performance, but the sag and wind displacement of the busbar are large, and the horizontal tension on the frame is relatively large, and it occupies a large area; The ground area is relatively small, and the height of the supporting pipe busbar bracket is low, which is convenient for construction and maintenance, but its anti-seismic and wind resistance performance is poor; while the seismic performance of the suspended busbar is good, but the structure of the busbar is high, and construction and maintenance are more difficult.

If the busbars are vertically arranged and the plane is converted into space, the horizontal distance of the busbar layout is shortened, and the main circuit breaker can be installed on the low-voltage side of the main transformer, which meets the site restriction requirements of the general design. However, under the vertical arrangement of the busbars, each phase In the same vertical plane, in rainy and snowy weather, it is easy to form a water column between adjacent phases, causing a short circuit between phases and causing a grid system failure.

If the horizontal ladder layout of the busbar is adopted, in the same busbar, the adjacent horizontal phases are staggered, which can solve the problem of interphase short circuit in rainy and snowy weather, and turn the plane into space, shortening the horizontal distance of the busbar layout; but under the horizontal ladder layout of the busbar, The force of the busbar on the insulator or the frame is relatively large, which may easily cause the instability of the busbar frame and affect the safe operation of the substation. The frame needs to be reinforced.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and provide a back-to-back arrangement structure of supporting busbars, which replaces the plane with space, and optimizes the conventional horizontally or vertically arranged busbars into a back-to-back upper-middle-lower support type The ladder-arranged busbar reduces the force of the busbar on the insulator or frame, and at the same time makes the adjacent phases in the same busbar staggered to avoid interphase short circuit in rainy and snowy weather; in addition, this arrangement makes the existing main transformer and The reactive field can arrange two busbars, the confluence busbar and the main busbar, so that the power distribution device can be arranged more compactly, and the purpose of saving land is achieved.

For this reason, the present invention adopts the following technical scheme: the back-to-back arrangement structure of the supporting busbar, including vertically arranged steel pipe poles, horizontally arranged horizontal crossarms, horizontal confluence busbars and main busbars,

Three layers of horizontal arms of different lengths are arranged on both sides of the steel pipe pole in a back-to-back manner, and post insulators for busbars are respectively arranged at the ends of the horizontal arms;

The post insulator is arranged perpendicular to the horizontal cross arm, the busbar is arranged on one side of the steel pipe pole through the step of the post insulator, and the main busbar is arranged on the other side of the steel pipe pole through the step of the post insulator.

As a further improvement and supplement to the above-mentioned technical solution, the present invention takes the following technical measures:

In the same busbar, the horizontal distance between adjacent phases is 0.4-0.6 meters, and the vertical distance is 1.7-2.0 meters. They are arranged in steps from top to bottom to ensure a safe distance between phases and meet the minimum electrical distance required for insulation coordination.

A circuit breaker is provided between the isolating switch and the current transformer. The reliability of the wiring is improved through the circuit breaker, and the problems of large-scale engineering transformation and equipment selection specifications are avoided to the greatest extent, so that it is convenient for operation safety and operation inspection, easy maintenance and installation, and saves the cost of three materials and construction costs.

The bus bar is connected to the isolating device by copper bars, and flexible wires are used to connect the isolating device and the circuit breaker and between the circuit breaker and the current transformer.

The height of the post insulator is preferably 0.5-0.7 meters.

The lengths of the horizontal arms are respectively 2.3-2.5 meters, 1.9-2.1 meters and 1.5-1.7 meters from top to bottom.

Both the converging busbar and the main busbar are tubular busbars, and the distances between them in phase are 4.0-4.2 meters, 3.2-3.4 meters, and 2.4-2.6 meters from top to bottom.

The present invention optimizes the conventional horizontally arranged or vertically arranged busbars into back-to-back upper-middle-lower supported stepped busbars, which reduces the force of the busbars on the insulator or frame under the conventional horizontal ladder arrangement, improves the stability of the frame, and avoids rain and snow Phase-to-phase short circuit in weather, improve reliability, safe operation and convenient operation inspection, easy maintenance and installation, reduce personnel investment, improve operation safety benefits; make it possible to arrange two converging busbars and main busbars in the existing main transformer and reactive field The busbar arranges the power distribution device more compactly, which achieves the purpose of saving land occupation and saving the investment of three materials, thereby greatly reducing the cost.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

In the figure, 1-vertical steel pipe pole, 2-horizontal cross arm, 3-combustion busbar, 4-main busbar, 5-pillar insulator, 6-disconnector, 7-circuit breaker, 8-current transformer.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the back-to-back arrangement structure of the supporting busbar is composed of a vertically arranged steel pipe pole 1, a horizontally arranged horizontal cross arm 2, a confluence busbar 3 and a main busbar 4, and the two sides of the steel pipe pole 1 are back-to-back Three layers of horizontal cross-arms 2 of different lengths are arranged in this way, and post insulators 5 of the busbar are arranged at the ends of the horizontal cross-arms 2 . The post insulators are arranged perpendicular to the horizontal cross arm 2, the three-phase three-wire (ie A, B, C) of the busbar 3 is arranged on one side of the steel pipe pole 1 through the post insulator 5 steps, and the main bus bar 4 (ie A , B, C) are arranged on the other side of the steel pipe pole through 5 steps of post insulators.

In the same busbar, the horizontal distance between adjacent phases is 0.4 meters, and the vertical distance is 1.7 meters, arranged in steps from top to bottom. A circuit breaker 7 is provided between the disconnector 6 and the current transformer 8 . The bus bar 3 is connected to the isolation device 6 by copper bars, and flexible wires are used to connect the isolation device 6 and the circuit breaker 7 and between the circuit breaker 7 and the current transformer 8 . The height of the post insulator 5 is 0.7 meters. The length of horizontal cross arm 2 is respectively 2.3 meters, 1.9 meters, 1.5 meters from top to bottom. Convergence busbar 3 and main busbar 4 both adopt tubular busbars, and the horizontal distances between them in phase are 4.0m, 3.2m, and 2.4m from top to bottom, respectively.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the structure of the present invention in any form. All simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention fall within the protection scope of the present invention.

Claims (7)

1. the back-to-back arrangement of brace type bus, including vertically disposed steel pipe pole (1), horizontally disposed cross-arm (2), level Bus rod (3) and main bus-bar (4), it is characterised in that the both sides of the vertical steel tube rod (1) use and set in back-to-back fashion Three layers of horizontal cross-arm (2) different in size, and in the support insulator (5) of horizontal cross-arm (2) end set bus；

The support insulator arranges that described bus rod (3) passes through support insulator (5) ladder cloth perpendicular to horizontal cross-arm Put and the opposite side of steel pipe pole (1) is arranged in by support insulator (5) ladder in the side of steel pipe pole (1), main bus-bar (4).

2. the back-to-back arrangement of brace type bus according to claim 1, it is characterised in that adjacent in same bus Alternate horizontal range is 0.4-0.6 rice, and vertical range is 1.7-2.0 rice, from top to bottom step arrangement.

3. the back-to-back arrangement of brace type bus according to claim 1 or 2, it is characterised in that in disconnecting switch (6) Breaker (7) is provided between current transformer (8).

4. the back-to-back arrangement of brace type bus according to claim 3, it is characterised in that described bus rod (3) it is connected using copper bar with xegregating unit (6), between xegregating unit (6) and breaker (7) and breaker (7) and Current Mutual Inductance Connected between device (8) using flexible circuit conductor.

5. the back-to-back arrangement of brace type bus according to claim 1 or 2, it is characterised in that the post insulator The height of sub (5) is 0.5-0.7 rice.

6. the back-to-back arrangement of brace type bus according to claim 1 or 2, it is characterised in that the horizontal cross-arm (2) length is respectively 2.3-2.5 rice, 1.9-2.1 rice, 1.5-1.7 rice from top to bottom.

7. brace type bus according to claim 1 or 2 leans against arrangement, it is characterised in that the bus rod (3) Tube type bus is used with main bus-bar (4), both are respectively 4.0-4.2 rice, 3.2-3.4 from top to down with the level interval of phase Rice, 2.4-2.6 rice.