CN202268606U - Current passage fitting bridging wall bushing and tubular bus and used for 400 kV converter station - Google Patents

Abstract

The utility model provides a 400kV converter station with a wall-through bushing and a pipe busbar to bridge over-current fittings, which are connected to the pipe busbar after being connected to the wall-through bushing, including conductive rod fixing fittings, pipe busbar fixing fittings, drainage wires and pipe busbars. The bus bar supports the sliding claw plate, which also includes a pressure equalizing cover, a universal joint, a hoop and a bracket; while realizing a reasonable installation space structure of the bridge overcurrent fittings, it effectively reduces corona discharge and audible noise, and A flexible system is formed to ensure the thermal expansion and contraction of the tube busbar and the passage of current by making the tube busbar support sliding claw plate, the drain wire, the tube busbar fixing fittings and the conductive rod fixing fittings form a flexible system.

Description

400kV converter station bridge over-current fittings for wall-piercing bushing and busbar

technical field

The utility model relates to an electric power fitting, in particular to a 400kV converter station cross-connecting over-current fitting between a wall bushing and a busbar.

Background technique

At present, my country has become a major DC power transmission country with the most DC projects in operation and under construction, the largest capacity and the longest lines in the world. The valve hall fittings in the DC converter station can generally be divided into valve hall connecting fittings, pressure equalizing cover (ball), shielding half ring and some transition transition fittings. With the increase of DC transmission voltage, valve hall fittings have increasingly become an indispensable part of the valve hall.

The valve hall of the converter station is a closed space. The valve hall is equipped with important equipment such as valve towers, bushings, and voltage transformers. The conversion of AC and DC is also carried out in the valve hall, so the valve hall is particularly sensitive to corona and radio interference. Strict. At the same time, due to the limited space of the valve hall and the intricate arrangement of fittings in the valve hall, the requirements for the structure of the fittings are particularly strict. The cost of the bridge over-flow fittings currently used in the market is high, and it cannot be installed flexibly and accurately in a small space and complex environment. At the same time, it also prevents corona discharge and reduces audible noise.

Utility model content

The purpose of the utility model is to solve the problem of unreasonable installation structure of the space where the valve hall bridges the over-flow fittings and the corona discharge of the valve hall cross-flow fittings, and the problem of large audible noise. the

In order to solve the above-mentioned technical problems, the utility model provides a 400kV converter station with wall bushing and pipe busbar cross-over flow fittings. Fixing fittings, drainage wires and pipe busbars support the sliding claw plate, and also include pressure equalizing cover, universal joint, hoop and bracket, one end of the bracket is connected with the pressure equalizing cover, the other end is connected with the hoop, and one end of the fitting is fixed by a conductive rod It is connected with the wall bushing, and the other end is connected with one end of the universal joint, and the other end of the universal joint is connected with a pipe bus support sliding claw plate, which is inserted into the external pipe bus and kept insulated from the pipe bus It is set that a drain wire is connected between the pipe busbar fixing hardware and the conductive rod fixing hardware.

The pressure equalizing cover includes a hemisphere and a cylinder, the cylinder and the hemisphere are connected by countersunk screws, the hemisphere is provided with a through hole, the bracket is set inside the pressure equalizing cover, and is fixed on the insulator of the wall bushing through a hoop .

The opening edge of the through hole is bent inward.

The connecting hole for connecting the bracket and the pressure equalizing cover is set as a waist-shaped hole.

The pipe bus bar supports the sliding claw plate including the sliding claw plate and the connecting rod, the sliding claw plate and the connecting rod are vertically fixedly connected, the other end of the connecting rod is connected with one end of the universal joint connected thereto, and the sliding claw plate of nylon material Fitted into the inner wall of the pipe busbar to which it is connected.

The drainage line is arranged in an arc shape.

The pressure equalizing cover is bent from an alloy aluminum plate, and is divided into a hemisphere and a cylinder. The hemisphere and the cylinder are connected by countersunk screws to form a bullet shape. The surface is set as a smooth arc surface. The spherical surface of the ball is provided with a through hole which can pass through the tube busbar and not contact the tube busbar, and the opening of the through hole is bent inward.

After the inside of the cylinder of the pressure equalizing cover is connected by a bracket and a hoop, it is clamped on the insulator part of the wall bushing with a hoop, so that the pressure equalizing cover covers other parts of the cross-flow fitting without contact to prevent corona , the connection hole of the bracket is set as a waist hole to facilitate the adjustment of the installation position of the pressure equalizing cover.

The fixing fittings for the conductive rod and the fixing fittings for the pipe busbar are connected with the drain wire as a whole through welding process, and the drain wire is made into a regular arc shape to ensure the heat expansion and cold contraction of the pipe busbar. The conductive rod fixing hardware is connected to the copper conductive rod of the wall bushing, and the pipe bus fixing hardware is connected to the pipe bus through bolt fixing. The pipe busbars form the pathways.

The universal joint can rotate in multiple directions to ensure the smooth connection between the hardware parts; the sliding pawl plate supported by the pipe bus bar includes a connecting rod and a sliding pawl plate, and the connecting rod and the sliding pawl plate can slide in the pipe bus bar. The six supporting claws of the sliding claw disc are made of nylon material, which is wear-resistant on the one hand and can block the current on the other hand. The tube bus bar supporting sliding claw plate can support the tube bus bar, thereby reducing the bending moment of the tube bus bar fixing hardware.

The beneficial effect of the utility model is that while providing a bridge fitting with a reasonable installation space structure, the corona discharge and audible noise are reduced, and the pipe busbar supports the sliding claw plate, the drainage line, the pipe busbar fixing fittings and the conductive The rod fixing fittings form a flexible system to ensure the thermal expansion and contraction of the bus bar and the passing of current.

Description of drawings

Figure 1 is a schematic diagram of the principle structure of the utility model.

Among them: 1-pressure equalizing cover, 2-pipe busbar fixing fittings, 3-conductive rod fixing fittings, 4-universal joint, 5-drainage line, 6-hoop, 7-bracket, 8-sliding claw plate, 9- Connecting rod, 10-waist hole, 11-pipe busbar, 12-wall bushing.

Detailed ways

The preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

Example of an embodiment As shown in Figure 1, this embodiment provides a bridge overcurrent fitting between a wall bushing and a busbar in a converter station, including a pressure equalizing cover 1, a hoop 6, a bracket 7, a conductive rod fixing fitting 3, and a pipe busbar. The busbar fixing hardware 2, the drainage wire 5, the universal joint 4 and the busbar support sliding claw plate, the busbar 11 has a diameter of 250 mm, or other diameters of the busbar can also be used.

The appearance and shape of the pressure equalizing cover 1 is similar to that of a bullet, including a hemisphere and a cylinder. On the insulator part of 12, after the installation of the jumper fittings is completed, the hemisphere and the cylinder are connected as a whole by countersunk screws to form a pressure equalizing cover 1, and the spherical surface of the hemisphere of the pressure equalizing cover 1 has a hole that can pass through the pipe bus 11 The opening of the through hole is bent inward without touching the through hole of the pipe busbar 11; the bracket 7 is provided with a waist-shaped hole 10 to facilitate the adjustment of the installation position.

It has been verified by tests that the internal space of the pressure equalizing cover 1 leaves a reasonable space for the installation of other parts that bridge over-current fittings; it also ensures a reasonable electrical distance between the pressure equalizing cover 1 and the wall, the ground, etc.; the countersunk head The screw connection does not affect the anti-halo effect of the sphere, which meets the requirements of use.

The conductive rod fixing fitting 3 and the pipe busbar fixing fitting 2 are connected as a whole with the drain wire 5 through welding process, or they can also be connected by bolt connection. The drain wire 5 is made into a regular arc shape to ensure the heat expansion and cooling of the pipe busbar 11 shrink. The inner surface of the conductive rod fixing fitting 3 is pasted with a copper-aluminum composite sheet, which is fixed by bolts to connect the copper conductive rod of the wall bushing 12, and the busbar fixing fitting 2 is fixed by bolts to connect the busbar 11 with a diameter of 250mm. The conductive rod of the wall bushing 12, the conductive rod fixing fitting 3, the drain wire 5, the pipe busbar fixing fitting 2, and the pipe busbar 11 form a passage.

The conventional universal joint 4 can rotate in multiple directions to ensure the smooth connection between the parts spanning the flow-through fittings; Claw plate 8 can slide in pipe busbar 11, and sliding claw plate 8 adopts the shape of six claws of nylon material, and nylon is wear-resistant on the one hand, can block electric current on the other hand. The pipe busbar supporting sliding claw plate can support the pipe busbar 11 through the connecting rod 9 and the sliding claw plate 8, thereby reducing the bending moment of the pipe busbar fixing hardware 2.

The beneficial effect of this embodiment is to realize a reasonable installation space structure of the bridge overcurrent fittings, effectively reduce corona discharge and audible noise, and make the pipe busbar support the sliding claw plate, the drainage line 5, and the pipe busbar The fixing fittings 2 and the conductive rod fixing fittings 3 form a flexible system to ensure the thermal expansion and contraction of the bus bar and the passage of current.

Claims (6)

1. a 400kV current conversion station is with wall bushing and pipe bus cross-over connection overcurrent gold utensil; Is connected with the pipe bus after connecting wall bushing, comprise conducting rod fixedly gold utensil, manage bus fixedly gold utensil, drainage thread and manage bus support sliding jaw dish, it is characterized in that: also comprise grading shield, universal joint, shroud ring and support; One end of support links to each other with grading shield; The other end links to each other with shroud ring, and a conducting rod fixedly end of gold utensil is connected with wall bushing, and the other end connects an end of universal joint; The other end of universal joint is connected with the pipe bus and supports the sliding jaw dish; The pipe bus supports the sliding jaw dish and inserts in the external pipe bus, and keeps and the setting of pipe bus insulation, and pipe bus fixedly gold utensil and conducting rod fixedly is connected to drainage thread between the gold utensil.

2. 400kV current conversion station according to claim 1 is with wall bushing and pipe bus cross-over connection overcurrent gold utensil; It is characterized in that: grading shield comprises semi-round ball and cylinder; Cylinder is connected through flat head screw with semi-round ball; Semi-round ball is provided with through hole, and support is arranged on the inside of grading shield, is fixed on through shroud ring on the insulator of wall bushing.

3. 400kV current conversion station according to claim 2 is characterized in that: the inside bending of the opening edge of through hole with wall bushing and pipe bus cross-over connection overcurrent gold utensil.

4. 400kV current conversion station according to claim 3 is with wall bushing and pipe bus cross-over connection overcurrent gold utensil, and it is characterized in that: the connecting hole that support is connected with grading shield is arranged to mounting hole.

According to claim 1 or 2 or 3 or 4 described 400kV current conversion stations with wall bushing and pipe bus cross-over connection overcurrent gold utensil; It is characterized in that: said pipe bus supports the sliding jaw dish and comprises sliding jaw dish and connecting rod; The sliding jaw dish is connected with the connecting rod vertical fixing; One end of the other end of connecting rod and the universal joint that is attached thereto is connected, and adopts adaptive being inserted in the pipe bus inwall that is attached thereto of sliding jaw dish of nylon material.

6. 400kV current conversion station according to claim 5 is with wall bushing and pipe bus cross-over connection overcurrent gold utensil, and it is characterized in that: drainage thread is arranged to arc.

Images