RU23523U1 - HIGH VOLTAGE GAS SWITCH FOR OUTDOOR INSTALLATION - Google Patents

Description

OUTDOOR GAS SWITCH

The utility model relates to electrical engineering, and more particularly, to high voltage electrical circuit breakers of an outdoor installation with arc extinction by compressed gas or gas mixtures, for example, SF6 gas.

Known are SF6 and PMRI outdoor type SF6 circuit breakers of AC type (bulletin 33-230A-R ABB Pover T&D Company Inc) containing three poles with high voltage bushings mounted on them, equipped with porcelain tires. Current transformers are installed on the bottom of each input over the tire.

The disadvantage of this design solution is the large consumption of current transformers, associated with an increase in their size when placed outside the tire.

Closest to the claimed utility model is a gas-insulated outdoor circuit breaker of type VGBE-35 (A.A. Chunikhin. High-voltage electrical apparatus. Switches. Volume 1. Reference, p. 7981), containing three poles, each of which is made in in the form of a metal casing with high-voltage bushings installed on it. The housing of each input consists of an insulator and a pipe for installing a block of current transformers (BTT), located between the insulator and the casing of the pole. In this case, the BTT is installed outside the pipe.

The disadvantage of the design of the prototype is also the high material consumption in terms of the use of ferrous and non-ferrous metals (copper, aluminum), due to the fact that the external placement of BTT relative to the pipe leads to an increase in overall

IPC 6 H01N 33/00

the dimensions of the magnetic cores and their masses and, as a result, the length of the copper wire of the secondary windings and the appearance of the outer housing of the BTT, which is a protective shield.

The technical problem to be solved is the creation of the design of an outdoor high-voltage gas circuit breaker for outdoor installation with the lowest possible material consumption while maintaining technical characteristics.

The technical result achieved by the implementation of the utility model,

consists in reducing the material consumption of BTT in terms of the use of non-ferrous and ferrous metals in comparison with outdoor transformers having the same characteristics.

The indicated technical result is achieved by the fact that in the outdoor high-voltage gas switch containing three poles, each of which is made in the form of a metal casing with high-voltage bushings installed on it, each of which consists of an insulator and a pipe located between the insulator and the pole casing In this case, each high-voltage input is equipped with a BTT, the new one is that the BTT is located inside the nozzle.

Placing the BTT inside the pipe leads to a decrease in the inner and outer diameters of the magnetic cores of the current transformers and, consequently, to a decrease. the length of the copper wire of the current transformer winding, which leads to a decrease in material consumption in terms of the use of non-ferrous metals while reducing the dimensions of the transformer. In addition, there is no need to protect the BTT with an additional screen.

The figure shows the pole of a high-voltage gas circuit breaker for outdoor AC installation, where: 1 - a casing, 2 - a high-voltage input, 3 insulator, 4 - a pipe, 5 - a block of current transformers, 6 - a conductive rod, 7-pin group (conditional image).

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The inventive switch contains three poles located on a common steel supporting structure (not shown in the figure). Each pole is made in the form of a grounded cylindrical aluminum casing 1, on which two high-voltage bushings are installed 2. The housing of each bush 2 consists of a porcelain insulator 3 and a nozzle 4 located between the insulator 3 and the flange of the pole casing 1. Each

input 2 is equipped with a block of current transformers 5. A block of current transformers 5 (up to three pieces per input), designed to measure the current of the main circuit of the switch and supply the relay protection circuits, is located in pipe 4.

The conductive rod 6, which is the primary winding of current transformers 5, is connected to the upper flange of the input 2, passes through its center and is attached to the contact group 7 electrode by the lower end.

The inventive device operates as follows. A high-voltage switch, being a switching device of an electric circuit, performs

operations of turning on and off the current by closing and opening the contact group 7 during operational and emergency switching.

The alternating electric current flowing through the switch passes through a series-connected circuit of elements, which includes high-voltage bushings 2, conductive rods 6 and contact group 7 (see figure).

The inclusion of measuring instruments directly in the high current circuit is not possible. To convert a large primary current into alternating current, acceptable in value for the inclusion of standard measuring instruments,

current transformers are used, which according to their purpose differ in CT for measurements and CT for protection.

TTs for protection are intended for transferring measuring information to protection and control devices. Accordingly, the CT for protection provides power to the relay protection devices with an acceptable AC value and

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isolates the relays that service personnel have access to, high voltage circuits.

Certification tests of current transformer blocks have confirmed the feasibility and practical value of the proposed solution.

Claims (1)

An outdoor high-voltage gas switch containing three poles, each of which is made in the form of a metal casing with high-voltage bushings installed on it, each of which consists of an insulator and a nozzle located between the insulator and the pole casing, with each high-voltage input equipped with a transformer block current, characterized in that the block of current transformers is placed inside the specified pipe.