RU110552U1 - COMPLETE DISTRIBUTION DEVICE - Google Patents

Abstract

 1. Complete switchgear with gas-insulated insulation, in the housing of which there is a compartment for a high-voltage circuit breaker, a compartment for busbars and a disconnector, as well as compartments for cable connections, current and voltage transformers, relay equipment, as well as a gas discharge system during emergency operation, characterized in that the compartment of the high-voltage circuit breaker is located above the compartment of busbars and the disconnector, and the compartment of cable connections is located in the volume, which is limited by the compartment of the high-voltage circuit breaker, compartment collection s tire and isolator and casing of the distribution device. ! 2. The device according to claim 1, characterized in that the gas discharge system during emergency operation is made in the form of lower and upper separate channels for gas discharge and the lower and upper emergency valves, while the upper channel is located above the compartment of the high-voltage switch, and the lower channel is located under the busbar and disconnect compartment. ! 3. The device according to claim 2, characterized in that the lower emergency valve is installed on a common wall between the busbar and disconnector compartment and the cable connection compartment, and the upper emergency valve is installed on a common wall between the high-voltage circuit breaker compartment and the current and voltage transformer compartment. ! 4. The device according to claim 2, characterized in that the compartment of the high-voltage circuit breaker and the compartment of the busbars and the disconnector, which are sealed, filled with sulfur hexafluoride (SF6 gas).

Description

The utility model relates to electrical engineering, in particular, to medium-voltage switchgear with gas-insulated insulation.

Known switchgears, the set of which includes high-voltage switches, disconnectors, busbars and other equipment necessary for the operation of switchgears. To improve the reliability of such devices, high-voltage switches, disconnectors and busbars are often placed in an airtight metal compartment filled with sulfur hexafluoride (six sulfur fluoride), with good dielectric characteristics, or dielectric gas (SF6). In particular, such pressurized compartments with a switch are located mainly in the lower part of the switchgear (for example, company brochures: ABB Calor Emag Schaltanlagen AG instruction manuel no. PEACE 2005 gse. Printed in Germany; SIMENS. Postfach 3220, W - 8520 Erlander printed in the Fed. Rep. of Germany; patents No. 2098902. RU, No. 2154330. RU; No. 2344529. RU). To ensure ease of maintenance, high-voltage switches and disconnectors with busbars are placed in separate airtight compartments.

The closest solution is a medium voltage switchgear switchgear, type NXPLUS, with gas-insulated insulation (see SIMENS Catalog: Medium-Voltage Switchgear, Catalog ON 35/51. 2005).

This switchgear has separate, sealed compartments with gas-insulated insulation: a compartment for a high-voltage circuit breaker and a compartment for busbars and a disconnector, as well as compartments for cable connections, voltage transformers, relay equipment, as well as a gas vent system in emergency mode. At the same time, the compartment of the high-voltage switch located under the compartment of the disconnector and busbars in the lower part of the switchgear, and the compartment of cable connections is located under the compartment of the high-voltage switch, almost at the bottom of the switchgear. The gas discharge system is made in the form of an integral channel (duct) located along the entire height of the rear wall of the switchgear.

This arrangement of compartments has several disadvantages. In particular, the placement of the cable connection compartment under the compartment of the high-voltage circuit breaker with its mechanical connections to drive devices that are located on the front wall of the compartment and which are driven by switching devices complicates the connection of high-voltage cables, especially if it is necessary to change the number of buses for different customer needs. Maintenance of the drive part of the high-voltage circuit breaker requires the complete release of the insulating dielectric gas from the sealed compartment, and it is known from operation that such an operation takes a rather long time. Placing a discharge channel in the form of a box along the entire height of the rear wall of the switchgear complicates access to the nodes of the device.

All this greatly complicates the operation of the switchgear, which leads to prolonged interruptions in the supply of power to the consumer.

The technical task of the utility model is to create a complete switchgear, which provides the best conditions for its maintenance. This is achieved by the fact that the compartment of the high-voltage switch is located above the compartment of busbars and the disconnector, and the compartment of cable connections is placed in an amount that is limited by the compartment of the high-voltage switch, compartment of busbars and the housing of the switchgear. The gas discharge system in emergency mode is made in the form of an upper and lower separate channels for gas discharge, while the upper channel is located above the compartment of the high-voltage switch, and the lower channel is located under the compartment of busbars and disconnector. The upper channel is installed with the ability to connect to the compartment of the high-voltage circuit breaker and to the compartment of current and voltage transformers, and the lower channel is installed to connect to the compartment of busbars and a disconnector and with the compartment of cable connections. The compartment of the high-voltage circuit breaker and the compartment of busbars and disconnector, which are sealed, filled with sulfur hexafluoride (SF6).

In FIG. 1 shows a side view of the switchgear (with the side wall of the housing removed; FIG. 2 is a view of the switchgear in the direction of arrow L (in FIG. 1).

The complete switchgear has a housing 1, in which there is a sealed compartment A for busbars and a disconnector, a sealed compartment B for the circuit breaker, compartment C for cable connections, compartment D of voltage transformers, compartment D of the relay equipment, and also a gas discharge system 2 in emergency mode, which consists of from channels K1 and K2 and the lower and upper emergency valves.

In the airtight compartment A of the busbars are placed tires 3 and three position grounding disconnector 4.

In the sealed compartment B of the switch, a high-voltage switch 5 (for example, the VRS-35 series) and busbar 6 are placed.

In the compartment B cable connections is a transformer 7 current zero sequence, transformers 8 current, limiter 9 overvoltage and cable adapter 10, which are located in front of the rear doors 11 compartment B cable connections.

In the compartment G voltage transformers placed transformers 12 voltage.

In compartment D there is a disconnector drive 13, a circuit breaker drive 14 and other necessary relay equipment (not shown).

On the common wall of compartment B and channel K1 there is a valve 15 (for example, in the form of a rotary plate, which is pressed against the common wall by means of springs and closes the hole in it). The valve 15 in the drawing is conventionally shown (dashed) in the open position.

Similarly, on the common wall of compartment G and channel K2, there is a valve 16 of a similar design, which is also conventionally shown (dashed) in the open position in the drawing.

Hermetic compartments A and B are made in welded metal cases and are filled with sulfur hexofluoride (SF6). To ensure that the compartment B of the circuit breaker is sealed in the zones of the high-voltage terminals, bushings 17 with special seals (not shown) and bushings 18 are installed, which are also used to seal compartment A. The tightness of compartments A and B in the exit zones of the moving rods of the switch poles to the outside, t .e. Relay equipment compartment D is provided with special bellows with a rubber seal (not shown).

On the common wall of the sealed compartment A and channel K1, a lower emergency valve 19 is installed (for example, in the form of a plate of thin foil that breaks under the influence of gas pressure in emergency mode).

A similar upper emergency valve 20 is installed on the common wall of the sealed compartment B and channel K2.

On the rear wall of the pressurized compartment B and on the front wall of the pressurized compartment A, pressure gauges 21c are installed with valves for injecting / discharging SF6 gas and controlling its pressure.

Access to compartment D for servicing is provided through front upper doors 22 and lower doors 23 with handles 22.

Compartment B of the high voltage circuit breaker is located above compartment A of the busbars and the disconnector, and compartment B of the cable connections is located in an amount that is limited by compartment B of the high voltage circuit breaker, compartment A of the busbars and disconnector and housing 1 of the switchgear. This arrangement of compartments A and B made it possible to increase compartment B, which improves the conditions for carrying out repair scheduled and emergency work on cable connections (mounting by installers of thick cables with large bend radii, massive terminal contacts, etc.)

In an emergency (for example, during short circuits in compartments A and / or B, ultrahigh SF6 pressures from burning a high-voltage arc are generated) and emergency valves 19 and / or 20 are triggered (for example, by tearing a foil plate) and harmful SF6 enters the corresponding channel K1 and / or K2 and is diverted along them, preventing the action of these harmful gases on maintenance personnel.

If an accident occurs in compartment B (for example, the cable is lit), then the harmful gases that are released in this case are removed into the channel K1 through valve 15, opening it (see dotted line in figure 1).

If an accident occurs in compartment G (for example, a voltage transformer burns), then harmful gases are removed into channel K2 through valve 16, which works similarly.

To service the complete switchgear and carry out appropriate repairs, open the necessary doors to ensure access. In this case, there is no need for a complete release of insulating dielectric gas (SF6) from the sealed compartments. Due to the location of the switch compartment B above the busbar compartment A, i.e. almost at the top of the switchgear, ease of access and maintenance are provided.

Thus, a complete switchgear provides simplified maintenance and safety for personnel. Such a gas-insulated switchgear of the KU-35S series was created at the KB TzOV "High-voltage Union-Ukraine" (Rivne, Ukraine), manufactured at TzOV "RZVA Electric" (Rivne, Ukraine) of the holding "High-voltage Union", successfully passed the electric mechanical and high voltage tests, which confirmed its high operational reliability and safety.

Claims (4)

1. Complete switchgear with gas-insulated insulation, in the housing of which there is a compartment for a high-voltage circuit breaker, a compartment for busbars and a disconnector, as well as compartments for cable connections, current and voltage transformers, relay equipment, as well as a gas discharge system during emergency operation, characterized in that the compartment of the high-voltage circuit breaker is located above the compartment of busbars and the disconnector, and the compartment of cable connections is located in the volume, which is limited by the compartment of the high-voltage circuit breaker, compartment collection s tire and isolator and casing of the distribution device. 2. The device according to claim 1, characterized in that the gas discharge system during emergency operation is made in the form of lower and upper separate channels for gas discharge and the lower and upper emergency valves, while the upper channel is located above the compartment of the high-voltage switch, and the lower channel is located under the busbar and disconnect compartment. 3. The device according to claim 2, characterized in that the lower emergency valve is installed on a common wall between the busbar and disconnector compartment and the cable connection compartment, and the upper emergency valve is installed on a common wall between the high-voltage circuit breaker compartment and the current and voltage transformer compartment. 4. The device according to claim 2, characterized in that the compartment of the high-voltage circuit breaker and the compartment of the busbars and the disconnector, which are sealed, filled with sulfur hexafluoride (SF6 gas).