RU2309476C1 - Horizontally mounted rotary disconnecting switch - Google Patents

Abstract

FIELD: high-voltage switching devices.

SUBSTANCE: proposed disconnecting switch that enables switching of two circuits running from first bus system through mentioned disconnecting switch and further to circuit breaker or from second bus system 2 through mentioned disconnecting switch and further to same circuit breaker has frame that mounts rotary and fixed insulating columns. Each of the latter carries current-carrying blade with segment or pin contacts and operating mechanism for turning at least one insulating column. Rotary insulating column carries two current-carrying blades disposed at angle of 120 ± 20 deg. relative to one another, as viewed from top; operating mechanism of disconnecting switch is designed to ensure following three positions of current-carrying circuits: (a) one current-carrying blade is ON; (b) both blades are OFF; (c) other current-carrying blade is ON.

EFFECT: simplified design of outdoor switchgear, primarily that using circuits with two service and one bypass collecting bus systems; ability of developing new switchgear circuits.

3 cl, 2 dwg

Description

The invention relates to the field of electrical engineering, namely to switching devices of high voltage - disconnectors.

Known horizontal-supporting disconnectors, consisting of a frame on which two insulating columns are installed, at least one of which is rotary, or more often two rotary columns with current-carrying knives mounted on them with lamella or pin contacts and a drive for turning one or both insulating columns.

The specified disconnector, for example, the disconnector type RG-220, manufactured by JSC "Plant of electrical equipment" (Velikiye Luki) according to the technical conditions TU 3414-037-41586029-99, adopted as a prototype.

However, these disconnectors have one significant drawback, namely: they can provide a visible break in one circuit, for example, a break in the circuit from one busbar system to the circuit breaker.

If two circuits are suitable for the switch (for example, from two busbar systems), it is necessary to install two disconnectors, and one disconnector - from the distant busbar system - is installed with the so-called "keel" arrangement, which complicates the design of the switchgear.

The aim of the invention is the creation of a disconnector that allows you to switch two circuits, for example, from the first bus system (1 SS) through this disconnector (P) and then to the switch (B) or from the second bus system (2 SS) through this disconnector (P) and further to the same switch (B).

This goal is achieved by the fact that in the disconnector is horizontally rotary, containing a frame with rotary and fixed rotary insulation columns mounted on it, on each of which a current-carrying knife with lamella or pin contacts is fixed, and a drive for turning at least one insulation column on the rotary insulation the column has two current-carrying knives located in plan at an angle of 120 ± 20 ° relative to each other, and the drive of the disconnector is made so that it provides three positions of current-carrying knife : Included one current-carrying, both knives are disabled and enabled second current carrying blade; two current-carrying knives mounted on a rotary insulating column are electrically connected to each other, and lamella or pin contacts are mounted on current-carrying knives so that when the insulating column is rotated, they move in different planes, separated by at least a phase-phase distance from each other in addition, two current-carrying knives mounted on a rotary insulating column are isolated from each other by an insulating column and spaced apart in height by a distance of at least a phase-phase distance, and lamellar whether both pins are fixed to current-carrying current-carrying knives knife so that upon rotation of the insulating columns are moving in the same plane.

The design of the proposed disconnector is shown in the drawings.

Figure 1 shows the design of the disconnector with two live blades on one rotary column. The disconnector consists of a frame 1, on which a fixed isolation column 2 and a rotary isolation column 3 from the drive 4 are installed.

On the rotary column 3, two current-carrying knives 5 and 6 and a node 7 for connecting the busbar, leading, for example, to the switch (B) are fixed at an angle of 120 ± 20 ° to each other.

Two fixed contacts of the disconnector are fixed on the rotary insulating column 2: the lower - 8 and the upper - 9 and two nodes for connecting the busbar: 11 - for connecting the busbar from the second bus system (2 bushes) and 10 - for connecting the busbar from the first bus system (1 SS).

The fixed contact 8 is fixed to the insulating column 2 at a distance from the frame 1 not less than the phase-ground distance, and the fixed contact 9 is fixed to the insulating column 2 at a distance of not less than the phase-phase distance.

Drive 4 provides rotation of the insulating column 3 together with current-carrying knives 5 and 6 and three fixed positions of current-carrying knives:

I - the current-carrying knife is in contact with the fixed contact 8. This ensures the connection of the second bus system (2 NW) with a bus to the switch (B);

II - rotary column 3 with current-carrying knives is rotated by the drive by 60 ± 10 °. In this position, none of the current-carrying knives comes into contact with fixed contacts; this is the disconnected position of the disconnector;

III - rotary column 3 is rotated another 60 ± 10 °. In this position, the contact part of the current-carrying knife 6 comes into contact with the fixed contact 9, providing a current path from the first bus system (1 busbar) to the switch (B).

Figure 2 shows the design of the disconnector with two current-carrying knives 1 and 2 mounted on a rotary insulating column 3. A fixed contact of the disconnector 6 is installed on the rotary insulating column 5. The operation of the disconnector in figure 2 is similar to the operation of the disconnector in figure 1.

In the position shown in figure 2, provides a current path from 2 SS through the current-carrying knife 1 and the stationary contact of the disconnector 6 to the switch (B).

When turning the insulating column 3 from the actuator 4 by 60 ± 10 °, the disconnected position of the disconnector (position II) is ensured.

When the isolation column of the disconnector is rotated another 60 °, the contact part of the current-carrying knife 2 enters the fixed contact 6 and thereby provides a current path from 1 SS through the current-carrying knife 2 and the fixed contact 6 to the switch (B).

The angles 60 ± 10 ° and 120 ± 20 ° are selected based on the provision in the disconnected position of the disconnector of the visible gap R (Fig. 1) between the current-carrying knives and fixed contacts and the distance from the current-carrying knives in the disconnected position to the busbar connected to the second (fixed) disconnector contact.

Claims (3)

1. A horizontally rotary disconnector comprising a frame with rotary and fixed rotary insulation columns mounted on it, on each of which a current-carrying knife with lamella or pin contacts is fixed, and a drive for turning at least one insulation column, characterized in that on the rotary insulation two current-carrying knives are installed in the column, arranged in plan at an angle (120 ± 20) ° relative to each other, and the disconnector drive is designed to provide three positions of current-carrying knives: n current-carrying, both knives are disabled and enabled second current carrying a knife. 2. The disconnector according to claim 1, characterized in that two current-carrying knives mounted on a rotary insulating column are electrically connected to each other, and the lamella or pin contacts are mounted on current-carrying knives so that when the insulating column is rotated, they move in different planes, spaced from each other by a distance of not less than the phase-phase distance. 3. The disconnector according to claim 1, characterized in that two current-carrying knives mounted on a rotary insulating column are isolated from each other by means of an insulating column and spaced apart by a height of at least a phase-phase distance, and the lamella or pin contacts of both current-carrying knives are mounted on live knives so that when the insulating column is rotated, they move in the same plane.

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