RU26692U1 - CABINET OF COMPLETE DISTRIBUTION DEVICES TYPE КРУ - Google Patents

Abstract

Switchgear cabinet of switchgear type КРУ containing a high-voltage circuit breaker on a withdrawable trolley, automation protection compartment, busbars, earthing switch and cable entry, characterized in that the primary circuit elements (busbars, switch, cable entry with disconnector-earthing switch and current transformers ) are separated by partitions into compartments, providing (in emergency mode) the localization of the arc discharge within one compartment, and each of the compartments is equipped with a pressure relief valve and arc discharge products, while the protection and automation compartment contains a programmable microprocessor unit, the cabinet design is also universal for using both vacuum and gas-insulated circuit breakers located in the middle of the cabinet, the cabinet also has a system of mechanical and electrical interlocks that prevent movement circuit breaker from the working position to the control, as well as from the control position to the working position when the switch is installed on the drawer They say that the switch is turned on, when moving from the operating position to the control and vice versa, they do not allow the switch to move from the control to the working position when the knives of the grounding disconnector are turned on, they do not allow the grounding disconnector to be turned on when the switch is in the operating position, the door is locked, which does not allow access to the cable compartment when disconnected earthing switch, interlock that does not allow the circuit breaker to be moved from the test position to the operating position if secondary circuits are not connected

Description

The cabinet of complete switchgears КРУМХХ01-10-25-1250 ТУЗ, hereinafter referred to as the cabinet, is intended for switchgears with an insulated or grounded neutral 6 and 10 kV voltage through an arcing reactor.

It is known (RU Patent No. 2173014, Н 02 В 11/12, 11/28, 2001) A complete switchgear consisting of: a circuit breaker with vases with smart cameras of its phase modules located at different distances from the drive and placed in insulating tubular housings moreover, the movable contacts of the collet-type disconnector-earthing switch, moving horizontally, connect the potentials of the movable contacts of the phase modules of the vacuum circuit breaker with prefabricated busbars or with grounding sockets.

Known (RU Patent No. 2172545, Н 02 В 11/00, 2001) A cabinet of a complete switchgear comprising a withdrawable element compartment, a relay cabinet located above the withdrawable element compartment, an overpressure relief channel located behind the relay cabinet and connecting the compartment

withdrawable element with atmosphere, an additional compartment of the relay cabinet, located in the compartment of the withdrawable element and isolated from it by the front, rear and side channels.

The purpose of this utility model is to reduce dimensions, improve electrical characteristics and operational properties, increase safety and improve design.

This is achieved by using a gas-insulated or vacuum circuit breaker (depending on version), by grounding a disconnector with a spring closer, which increases the contact closure speed and, accordingly, reduces the arc burning time during short circuit, design features made in accordance with the requirements of state standards.

The cabinet is a metal structure from parts made of sheet steel, interconnected by mechanical riveting, as a result of which the production becomes more environmentally friendly (in contrast to structures connected by welding). The design is divided into four compartments:

-cable compartment (lower) 1 (see Fig. 1);

- compartment of busbars (upper) 3;

- compartment of secondary protection and automation control circuits (upper) 4.

The division into compartments and the presence of pressure relief valves 5, 6, 7 ensures the localization of the effects of an open electric arc within one compartment; the equipment of the other compartments remains intact. Explosion relief valves when an electric arc occurs are located on the side that is safe for the operator.

The presence of a mechanical (manual) drive guarantees the shutdown of the switch 8 and the closure of the grounding disconnector 9 in the absence of voltage on the secondary control and protection circuits (emergency operation).

The electric drive allows you to manipulate the switch remotely.

Access to the cabinet is limited by a system of locks that ensure safety when operating staff are working with it. The cabinet has the following locks:

-locking that does not allow the circuit breaker to move from the working position to the control one, as well as from the control position to the working one when the installed position is on

on the sliding element of the switch;

-Lock, not allowing the circuit breaker to turn on when moving from the working position to the control one and vice versa;

-Lock, not allowing the switch to move from the control to the working position with the blades of the grounding disconnector turned on;

-Lock, not allowing the inclusion of a grounding disconnector when the switch is in working position;

- door lock, which does not allow access to the compartment of the cable compartment with the earthing switch disconnected;

-locking that does not allow the switch to be moved from the control position to the working position if secondary protection and automation circuits are not connected;

-Lock, not allowing the door of the compartment compartment to open while the circuit breaker is in the control position;

- door lock, which does not allow access to the circuit breaker compartment, if the switch is not in the control position;

-blocking of the circuit breaker, preventing its movement to the working position with the switch compartment door open;

in working position with the cable compartment cover removed;

-blocking the compartment door of the circuit breaker, preventing the door from closing and moving the circuit breaker to the operating position when there is no connection of the secondary protection circuits and automation;

-blocking the switch, which does not allow removing the switch from the cabinet when secondary protection and automation circuits are connected.

The cabinet consists of the following structural prefabricated elements:

right and left side walls 10 (see Fig. 1); upper and lower rear walls 11, 12;

- horizontal panels of the partitions of the compartments 13.14;

-the front doors of the compartments (cable 15, switch 16, protection and automation 17);

- panels of valves for removing products of arc discharge 5, 6, 7;

-caps (compartment busbars 18, pit 19, 20, 21). Arc discharge products equipped

emergency alarm sensors.

To complete the cabinet there are options for using a gas or vacuum circuit breaker.

The switch is located on the trolley 21, which allows you to move it from the working position to the control (without opening the cabinet) and create a guaranteed clearance (300 mm) when the main ash breaks, as well as remove the switch from the cabinet for repair or replacement. To control parameters (current and voltage), the following measuring instruments are used:

- microprocessor control and automation unit Sepam 2000 22 (see Fig. 1);

current transformer 23;

-transformer of zero sequence 24;

voltage divider with indicator 25. The switch and the earthing switch are equipped

mechanical position indicators 26.27 to help control the closing and opening of contacts.

Claims (1)

Complete switchgear switchgear cabinet type KRU, containing a high-voltage circuit breaker on a withdrawable trolley, automation protection compartment, busbars, an earthing switch and cable entry, characterized in that the primary circuit elements (busbars, switch, cable entry with an earthing switch and current transformers ) are separated by partitions into compartments, providing (in emergency mode) the localization of the arc discharge within one compartment, and each of the compartments is equipped with a pressure relief valve and arc discharge products, while the protection and automation compartment contains a programmable microprocessor unit, the cabinet design is also universal for using both vacuum and gas-insulated circuit breakers located in the middle of the cabinet, the cabinet also has a system of mechanical and electrical interlocks that prevent movement circuit breaker from the working position to the control, as well as from the control position to the working position when the switch is installed on the drawer They say that the switch is turned on, when moving from the operating position to the control and vice versa, they do not allow the switch to move from the control to the working position when the knives of the grounding disconnector are turned on, they do not allow the grounding disconnector to be turned on when the switch is in the operating position, the door is locked, which does not allow access to the cable compartment when disconnected earthing switch, interlock that does not allow the circuit breaker to be moved from the test position to the operating position if secondary circuits are not connected and protection and automation, which does not allow the door to open the switch compartment while the switch is in the control position, door lock that does not allow access to the switch compartment if the switch is not in the control position, the switch lock that does not allow it to move to the working position with the door open circuit breaker compartment, locking the circuit breaker that does not allow it to move to the operating position with the cable compartment cover removed, locking the circuit breaker compartment door that prevents the door from closing and moving the circuit breaker to the operating position in the absence of connection of the secondary protection and automation circuits, blocking the circuit breaker, which does not allow removing the circuit breaker from the cabinet when the secondary protection and automation circuits are connected.