RU179417U1 - OUTLET ELEMENT IN A COMPLETE DISTRIBUTION CABINET CABINET - Google Patents

Abstract

The utility model relates to the field of electrical engineering, in particular to an electrical device, and is intended for use on all types of electrical switchgears with a voltage level of 6-10 kV, equipped with switching devices placed on withdrawable carts. The technical result consists in the possibility of realizing a visible break in the electrical load circuit switchgear without performing the operation of rolling out the withdrawable element. The withdrawable element of the cabinet contains a frame, a mouth mounted on a movable trolley on which a switch with a drive is fixed with a pole down, the terminals of the poles of which are connected by busbars with upper and lower disconnecting contacts, a flexible hose of auxiliary circuits with a plug connector and windows for monitoring the state of the switch and drive is placed on the frame facade, the frame contains fixing elements , controls, interlocks and grounding contacts, a tap is fixed at the pole of the switch, after the switch on the outgoing line side, a three-phase disconnect is installed on the element frame l with electric drive and limit switches, the disconnector consists of a frame on which the upper and lower taps are fixed through insulators, grounding contacts connected to the earthing circuit of the withdrawable element, the upper tap of the disconnector is connected to the tap of the vacuum circuit breaker, a movable contact is pivotally fixed to the lower tap of the linear disconnector which is connected to the disconnector electric drive by means of a rod, the lower branch of the linear disconnector is connected by busbars with a plug-in lamella contact, contact earthing switch placed on the isolator housing.

Description

The utility model relates to the field of electrical engineering, in particular to an electrical device, and is intended for use on all types of electrical switchgears (switchgear) of a voltage level of 6-10 kV, namely, switchgear-2-10, equipped with switching devices placed on roll-out carts.

One of the main functions of electrical switchgears (switchgear) is the switching of electrical networks. In normal mode, switching is performed by opening / closing the load switch. At the same time, shutdown / shutdown control is carried out both remotely, using an automated control system, and manually, using local authorities. According to the “Electrical Installation Rules” operating in the territory of the Russian Federation, installation of disconnecting devices with a visible gap should be provided in all switchgear circuits, providing the ability to disconnect all devices (circuit breakers, current transformers, etc.) of each circuit from busbars and stationary grounding is performed. One of the types of constructive implementation of integrated switchgears (switchgear) is the use of switching devices (circuit breakers), located on the rolling carts.

So KRU-2-10 consists of three main compartments: busbar compartment, linear compartment, roll-out truck compartment. In the upper part of the switchgear there is a relay cabinet, in which there are meters for measuring and metering electricity, control equipment, protection and signaling. The equipment to be rolled out (circuit breaker, voltage transformer, arresters, etc.) is installed in the drawout compartment. The trolley is a rigid frame structure on which a switch is installed, the upper and lower contacts of which are connected by a busbar to the plug contacts of the primary switchgear circuit. The switch has a drive with auxiliary equipment. On the front side of the trolley there is a special viewing window for monitoring the equipment installed on the trolley (Use of complex devices - How factory substations are performed. Ermilov A.A.S. 14, 1972. http://forca.ru/knigi/arhivy/kak -vypolnyayutsya-zavodskie-podstancii-14.html).

If it is necessary to carry out repairs and revisions of the main damaged element - the circuit breaker, and on the outgoing line or equipment powered by the outgoing line, the regulation provides for the following sequence of operations:

- load disconnection - performed by disconnecting the load switch (possibly remotely);

- the creation of a visible open circuit - for electrical switchboards equipped with switching devices placed on roll-out carts, it is carried out by rolling out the cart (usually mechanically directly on the switchgear);

- earthing of the outgoing line - performed by the earthing switch of the cart (usually mechanically directly on the switchgear).

Only after completing the indicated sequence of actions is it possible to start work.

Known from the prior art is a roll-out element of a cabinet of a complete switchgear (switchgear) in a medium and high voltage network of alternating and direct current (RU 2492562, НВВ 11/127, 2013; RU 113614, НВВ 11/127, 2012; http: // bryanskyetz. com / produkciya / vykatnye_elementy_vel / kru210), consisting of a switch with plug-in contacts mounted on a movable trolley, and a mechanism for moving the trolley. Using this mechanism, the withdrawable element is manually installed in the switchgear cabinet, connecting the circuit breaker to the power busbars using plug-in contacts, or for control or repair purposes, the circuit breaker is manually rolled forward, disconnecting it from the power busbars and the service personnel are not exposed to danger.

Known withdrawable switchgear element (RU 12295, Н02В 11/12, 02, 1999), comprising a metal frame on a wheel base, a high-voltage circuit breaker with a drive mounted on it, the terminals of the poles of which are connected by busbars to the upper and lower disconnecting contacts, the frame contains fixing elements, control and locking, two sliding spring-loaded contacts are installed under the base of the frame for grounding, handrails are located on the facade, a flexible hose for auxiliary circuits with a plug connector, windows for information on the status of the switch I drive, rotary switch.

The closest (prototype) is the roll-out element of the switchgear, the design of which is described in patent RU 12295.

In all these cases, if it is necessary to carry out repairs and revisions of the main damaged elements of the switchgear (circuit breaker, transformers, etc.), as well as on the outgoing line or equipment powered by the outgoing line, the above withdrawable elements are used that open the load switch and create visible breaking of the circuit only when they move inside the switchgear.

The need to roll out the cart with the switching device leads to the following negative consequences:

1. Decrease in efficiency when performing operational switching during the liquidation of accidents on the outgoing line or equipment powered by the outgoing line. (In case of an accident, an on-site brigade (AEB) is sent to the facility. If the AEB is sufficiently distant from the place of basing and in bad weather conditions, equipment is put into repair / commissioning with significant loss of time.

2. Downtime of the main technological equipment, and often the entire workshop (production).

The problem to which the proposed utility model is directed is to create a roll-out cabinet element of a complete switchgear in a 6-10 kV network, which provides quick switching with a visible gap and reduces downtime of technical equipment.

The technical result consists in the possibility of realizing a visible break in the electrical circuit of the load of the complete switchgear without performing the operation of moving the withdrawable element, which reduces the time spent on operational switching, increases the safety of work, reduces the cost of maintenance and repair of equipment, simplifies the operation of the withdrawable element.

The technical result is achieved by the fact that the withdrawable element of the cabinet of the complex switchgear comprising a frame mounted on a movable trolley, on which a circuit breaker with a drive is fixed, the terminals of the poles of which are connected by buses with the upper and lower disconnecting contacts, on the facade of the frame is a flexible hose of auxiliary circuits with a plug a connector and windows for monitoring the state of the switch and the drive, the frame contains elements for fixing, control, locking and grounding contacts, according to useful models, the vacuum circuit breaker is fixed with the pole down on which the tap is fixed, after the circuit breaker on the outgoing line side, a three-phase disconnector with an electric drive and limit switches is installed on the device frame, the disconnector consists of a frame on which the upper and lower branches are fixed through insulators, grounding contacts connected with the earthing circuit of the withdrawable element, the upper tap of the disconnector is connected to the tap of the vacuum circuit breaker, p a movable contact, which is connected via a traction to the disconnector electric drive, the lower tap of the linear disconnector is connected by busbars with a plug-in lamella contact, the earthing switch contacts are located on the disconnector case, so that in the “open” position the disconnector moving contact is placed on the earthing switch contacts.

The proposed constructive solution roll-out element gives the claimed device new properties that allow you to solve the problem and achieve a technical result.

The movable and fixed elements of the disconnector are assembled on a single frame, and the disconnector with an electric drive is located on the withdrawable element. This allows:

- to avoid “distortions” when closing the disconnector, since there is always some backlash between the withdrawable element and the module;

- allows to carry out maintenance of the disconnector in safer and more convenient conditions;

- allows you to avoid the presence of a person at the conclusion of the outgoing line for repair.

The disconnector is aligned with the earthing switch in such a way that when the disconnector opens, the outgoing line is grounded. This avoids the need to install additional equipment - an earthing switch and a drive to it.

In addition, the claimed withdrawable element of the cabinet of the complete switchgear has other distinctive features that complement and characterize the utility model in individual cases of execution:

- Means of monitoring the position of the three-phase disconnector are implemented using mechanical monitoring sensors, a video camera mounted on the frame of the withdrawable element, or in the form of a local viewing window on the facade of the frame.

- Means of controlling the position of a three-phase disconnector, as an option, can be implemented using signal valves, reed, optical or non-contact sensors for monitoring the position, as well as voltage monitoring sensors.

- As an electric drive, AC or DC electric drives, a step electric drive or a servo drive can be used.

- Switching on the electric drive can be carried out both from the switching device located on the door of the withdrawable element, and by applying a control action to the relay connected to the contact group located on the withdrawable element.

The essence of the utility model is exemplified by the drawings, where in FIG. 1 shows a withdrawable element with the proposed disconnector; in FIG. 2 - the proposed three-phase disconnector, General view.

The drawout element of the enclosure of the complete switchgear is a frame 1 mounted on a movable trolley 2. A vacuum switch 3 with a drive and limit switches (not shown) is connected to the frame 1 with the poles down, connected to one side by busbars 4 with plug-in lamella contacts 5, connecting the withdrawable element to the busbars of the switchgear in the busbar compartment, and on the other hand, at the pole 6 of the vacuum circuit breaker 3, a branch 7 of the vacuum off is fixed ents 3. Linear disconnector 8 fixed to the frame 1 of the withdrawable element. The disconnector 8 consists of a frame 9, on which the upper 10 and lower 11 taps are fixed through insulators 12, the upper tap 10 of the disconnector is connected to the tap 7 of the vacuum circuit breaker. A movable contact 13 is pivotally mounted on the lower tap 11 of the linear disconnector 8. The linear disconnector 8 is equipped with limit switches (not shown in the figure) and an electric drive 14, which is connected via the rod 15 to the movable contact 13, thereby moving the movable contact 13 of the linear disconnector from the position “Closed” to the “open” position. In the "closed" position, the movable contact 13 of the linear disconnector 8 is closed with the upper tap 10 of the linear disconnector. In the "open" position, the movable contact 13 of the linear disconnector 8 is closed with the contacts 16 of the ground electrode, mounted on the frame 9 of the linear disconnector. The lower tap AND of the linear disconnector 8 is connected to the busbars 17 with plug-in lamella contacts 18, connecting the withdrawable element to the linear buses.

On the facade of the frame 1 there is a flexible hose for auxiliary circuits with a plug connector (not shown in the figure) and a window (not shown in the figure) for monitoring the state of the switch and the drive. The frame 1 contains elements of fixation, blocking and grounding contacts (not shown in the figure). The circuit breaker drive is an electric drive. The withdrawable element may also have a device for mechanically moving the withdrawable element (not shown in the figure).

The application of the proposed type of withdrawable element will allow performing routine and repair work on the lines and on the connected electrical equipment after performing the following sequence of actions.

Upon receipt of an emergency message on the discharge line to the control panel, a command is issued to open the circuit breaker and close the electric circuit of opening the electric drive of the linear disconnector:

a) the circuit breaker is disconnected using an electric drive;

b) it is checked whether the circuit breaker is open;

c) when the electrical opening circuit is closed, the disconnector is put into the “open” position and the disconnector knives are placed on the grounding contacts;

c) it is checked whether the disconnector is open by means of a video camera or a viewing window on the front of the withdrawable element.

The repair team is sent to eliminate the accident.

After the emergency has been eliminated, a command is sent from the control panel to turn on the circuit breaker and to close the electric circuit of closing the linear disconnector electric drive:

Inclusion:

a) it is checked whether the circuit breaker is open;

b) when the electric closure circuit is closed, the disconnector is put into the “closed” position and the disconnector knives are removed from the grounding contacts;

c) it is checked whether the disconnector is closed by means of a video camera or a viewing window on the front of the withdrawable element;

d) the switch is turned on.

When the electric circuit closes the closing of the electric drive 14 of the three-phase disconnector 8, the electric drive rotates the shaft on which the rods 15 of the movable contacts 13 of the disconnector are fixed and the disconnector is switched to the closed position. The operation of the electric motor 14 stops when the limit switch is activated, which is adjusted to the position corresponding to the position of the movable contacts in the "closed" state. When the electric opening circuit of the electric drive 14 of the three-phase disconnector 8 is closed, the electric drive rotates the shaft on which the rods 15 of the movable contacts 13 of the disconnector are fixed in the opposite direction and the disconnector 8 is switched to the “open” position. The operation of the electric motor 14 stops when the limit switch is activated, which is adjusted to the position corresponding to the position of the movable contacts 13 in the "open" state.

Claims (4)

1. A drawout element of the cabinet of a complex switchgear comprising a frame mounted on a movable trolley on which a switch with a drive is fixed, the terminals of the poles of which are connected by busbars with upper and lower disconnecting contacts, on the facade of the frame is a flexible hose of auxiliary circuits with a plug connector and windows for monitoring the state of the switch and the drive, the frame contains elements for fixing, controlling, locking and grounding contacts, characterized in that the vacuum switch is fixed to the field catfish down, on which the tap is fixed, after the switch on the outgoing line side, a three-phase disconnector with an electric drive and limit switches is installed on the element frame, the disconnector consists of a frame on which the upper and lower branches are fixed through insulators, grounding contacts connected to the ground circuit of the withdrawable element , the upper tap of the disconnector is connected to the tap of the vacuum circuit breaker, the movable contact is pivotally fixed to the lower tap of the linear disconnector, which n with an electric drive of the disconnector, the lower tap of the linear disconnector is connected by busbars with a plug-in lamella contact, the earthing switch contacts are located on the disconnector case in such a way that in the “open” position the moving switch disconnector contact is placed on the earthing switch contacts. 2. The withdrawable element according to claim 1, characterized in that the means for controlling the position of the three-phase disconnector are implemented as a local viewing window on the facade of the frame or as a video camera mounted on the frame or in the form of mechanical position monitoring sensors. 3. The withdrawable element according to claim 1, characterized in that the means for controlling the position of the three-phase disconnector are implemented using signal fittings, reed, optical or non-contact sensors for monitoring the position, as well as voltage monitoring sensors. 4. The withdrawable element according to claim 1, characterized in that it is equipped with AC or DC electric drives, a step electric drive or a servo drive.

Images