RU206070U1 - EXTERNAL COMPLETE UNIT SINGLE-STANDING - Google Patents

Abstract

The utility model relates to electrical engineering, in particular to the structures of switchgear cabinets of complete transformer substations. The external complete stand-alone cubicle is a welded cabinet, which includes current and voltage transformers, disconnectors, a vacuum circuit breaker, surge arresters, earthing switches, voltage fuses, low-voltage relay protection, automation and control equipment. A high-voltage line input frame is installed on the roof of the cabinet. The technical result is to improve the operational characteristics of the device, namely, to increase the reliability of operation. 3 ill.

Description

The utility model relates to electrical engineering, in particular to the structures of switchgear cabinets of complete transformer substations.

Complete outdoor free-standing cells are designed to receive and distribute electrical energy of three-phase alternating current with a voltage of 6 or 10 kV at an industrial frequency of 50 Hz and are used to connect power and protect electrical equipment of powerful consumers, for example, excavators, drilling rigs, during open pit mining, as well as for connecting outdoor lighting and other equipment in quarries.

A cabinet for a single uninterruptible power supply (patent RU 63606, publ .: 27.05.2007 Bull. No. 15) is known from the prior art, which contains a housing consisting of two sections - upper and lower, made with the possibility of placing structural elements of the source in them and with open access, while an inverter unit is installed in the upper section of the housing, which includes a power unit with an inverter board, a high-frequency filter and an output transformer located in three horizontal rows, and the power unit with an inverter is fixed on a hinged plate installed in the upper part of the section with a gap to the rear wall of the case, and the high-frequency filter row is located above the output transformer and below the power unit; in the lower section, a switching device and a block of circuit breakers of outgoing feeders located under it are installed in two horizontal rows, the control and display board is located on the inner side in the middle of the front door the upper section, and the indication board The status control of the outgoing feeder circuit breaker block is located on the inner side in the upper part of the front door of the lower section. The disadvantage of this device is the impossibility of using it for power supply with a voltage of 6 (10) kV and protecting powerful mining equipment.

The closest in technical essence is a complete outdoor installation device (patent RU 40115, publ. 08/27/2004 Bull. No. 24), consisting of a prefabricated cabinet, including high-voltage switching equipment - disconnectors, circuit breaker, current and voltage transformers, bushing insulators , arresters, ice melting devices, low-voltage relay protection, automation and control equipment, the cabinet consists of three interconnected compartments, with disconnectors located in the upper compartment, a switch is located in the middle, low-voltage equipment and disconnector drives are located in the lower compartment. The disadvantages of this device are the complexity of the design, the presence of bare conductors on the roof of the device, which reduce the reliability and safety of the device.

The technical problem to be solved by the utility model is to develop a cell design that is convenient and safe to use.

This task is solved by the fact that a complete outdoor stand-alone cubicle is a welded cabinet, which includes current and voltage transformers, disconnectors, a vacuum circuit breaker, surge arresters, earthing switches, voltage fuses, low-voltage relay protection, automation and control equipment, on the roof the cabinet has a frame for the input of high-voltage lines.

The technical result provided by the given set of features is to improve the operational characteristics of the device, namely, to increase the reliability of operation due to the use of a high-voltage bushing using an insulated high-voltage wire and a bushing frame.

There is also an increase in the safety of use due to the localization of compartments, the implementation of locks, excluding erroneous actions of personnel during operation.

The cell is used to connect power supply and protect electrical equipment of excavators, drilling machines and other technological equipment used in open pit mining in electrical networks of three-phase alternating current with a voltage of 6 kV and a frequency of 50 Hz.

According to the declared utility model, the device includes:

all the necessary electromechanical interlocks to prevent personnel mishandling during maintenance and electric shock to personnel;

devices for transmitting electricity readings and the state of the relay protection unit via a Wi-Fi network;

service area.

The essence of the utility model is illustrated by drawings, which show:

figure 1 is a general view of the device;

figure 2 is a front view of the device,

figure 3 is a side view of the device,

where

1 - upper part

2 - lower part

3 - service area

4 - fence

5 - frame of air input of high-voltage lines

6 - Wi-Fi access point

7 - flashing beacon

8 - service compartment

9 - cable compartment

10 - busbar transformer

11 - voltage transformer

12 - high-voltage fuse

13 - transformer

14 - overvoltage limiter

15 - line disconnector

16 - mesh fencing

17 - current transformer

18 - drive of the main knives of the linear disconnector

19 - interlocked drive for two earthing switches

20 - vacuum switch

21 - overvoltage limiter

22 - earthing switch

23 - insulator

The external complete stand-alone cubicle is a welded cabinet, which includes current and voltage transformers, disconnectors, a vacuum circuit breaker, arresters, low-voltage relay protection, automation and control equipment, and installed at the service site.

The cabinet consists of two parts (upper 1 and lower 2), having the main structural components, such as a compartment for a line disconnector, a compartment for a vacuum circuit breaker, a cable compartment 9 and a service compartment 8.

The cubicle is divided by solid partitions into compartments, access to the compartments is closed by doors, padlocks and latches, unlocked with a key.

On the side of the service compartment there is a door with an internal lock. For access to the vacuum circuit breaker compartment from the rear side there is a door equipped with locks with a special key. There is a mesh fence 16 behind the line disconnector compartment door. There is also a separate cable compartment door 9 equipped with a limit switch. All external doors are rubber-sealed to provide IP54 enclosure protection.

The cell has a frame containing a service platform 3 and fences 4. The service platform 3 is a base on which the cabinet and the fence are installed and fixed by means of bolted connections. The assembly is carried out at the installation site. This solution allows the cell to be transported as a bulky cargo.

The cell is powered by a high-voltage insulated wire through the roof, on which sealed gland entries and a bushing frame are installed 5. Previously used solutions using high-voltage insulated wire to power the cell allow a wire break at the outlet of the roof gland bushing, which leads to frequent insulation damage and accidents. The input of the high-voltage insulated wire used in the declared cell for powering the cell in front of the sealed gland bushings is equipped with an input frame 5, which does not allow the wire to bend with a radius less than the allowable one, which excludes damage to the insulation of the high-voltage wire and contact of the wire insulation with grounded metal structures. The input frame 5 is fastened with bolted connections at the place where the cell is installed. The bushing frame is a prefabricated structure consisting of guides located in such a way that when the high-voltage insulated wire rests on them, its bending radius cannot be less than the minimum allowable.

Also on the roof is a flashing beacon 7 and a Wi-Fi access point for transmitting data 6 from an electricity meter and a microprocessor unit for relay protection and automation. An LED luminaire is installed under the canopy to illuminate the service area.

In the compartment of the line disconnector there are overvoltage arresters 14, a disconnector with a manual drive. The disconnector has earthing blades towards the vacuum circuit breaker compartment. Knife drives 18 are placed in the service compartment 8. A transformer for auxiliary needs is also installed in the compartment.

The compartment of the vacuum circuit breaker contains current transformers 17 in phases A and C, surge arresters, a vacuum circuit breaker 20 with a spring drive, voltage transformer 11, voltage transformer fuses 12. The compartment is separated from the main disconnector by a solid partition. On the back of the cubicle there is a door for access to the equipment for inspection and replacement of fuse-links. The vacuum switch 20 is installed at the bottom of the compartment. A compartment for step-down and decoupling transformers is provided under the vacuum circuit breaker.

The cable compartment contains contacts for connecting the cable, grounding knives of the cable line, and zero sequence current sensors. The compartment is isolated from other compartments by solid fences. The compartment door is equipped with a limit switch.

In the service compartment there are 15 linear disconnector drives and a control panel. The control panel contains control buttons, signal lamps and an electricity meter. Behind the control panel there is a compartment for relay protection and automation, containing a microprocessor protection unit, devices for protection and switching of secondary circuits.

The device is assembled at the factory. Thus, the declared utility model refers to an assembly unit and can be recognized as a device, since consists of parts that are in a constructive and functional unity.

Claims (1)

The outdoor complete unit is a freestanding cabinet, which includes current and voltage transformers, disconnectors, a vacuum circuit breaker, surge arresters, earthing switches, voltage fuses, low-voltage relay protection, automation and control equipment, characterized in that it is installed on the roof of the cabinet high-voltage lines input frame.

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