RU2287882C1 - Switchgear and control gear - Google Patents

Abstract

FIELD: electrical engineering; indoor metal-clad switchgear cabinets.

SUBSTANCE: proposed switchgear and control gear has frame, relay compartment, draw-out equipment compartment, busduct compartment, cable compartment, and power cables. Partition is provided between draw-out equipment compartment and cable compartment. Current and potential transformers, ground electrode, line buses, and power cables are disposed in cable compartment for cable termination. Partition between draw-out equipment compartment and cable compartment is detachable structure that mounts current transformer for turning about its axis through 90 deg. toward draw-out equipment compartment for their transfer from working to maintenance position. Such mechanical design is incorporated in novel series of switchgear and control gear, types KU-10S and KU-6S, characterized in unique makeup of compartments: draw-out equipment compartment is disposed in cabinet center above cable compartment. When in maintenance position, it is mounted on inventory bogie in maintenance passage affording easy access to secondary-circuit contacts of current transformer, to power cables for their termination, and to all kinds of ground-electrode interlocking devices.

EFFECT: enhanced safety in single-ended servicing, primarily of current transformers and ground electrode.

2 cl, 4 dwg

Description

The invention relates to the field of high-voltage structures, including the design of switchgear cabinets (hereinafter referred to as switchgear) of an indoor installation in a metal shell [1-3].

Known switchgears, commercially available, are standardized with sliding elements with vacuum and gas-insulated circuit breakers, designed to receive and distribute electrical energy of three-phase alternating current with a frequency of 50 and 60 Hz, voltage of 6-10 kV [2].

The well-known switchgear, which are mass-produced in the CIS countries and abroad (in particular, in Germany), include those that have similar to the proposed invention weight and technical and economic indicators and parameters, and also have the ability to be equipped with withdrawable elements with vacuum circuit breakers of the new generations, e.g. VD4, VM1, HD4, BP1 ... 3, VRS-6.

Such switchgear can be attributed to those such as patent No. 1652, 03/17/2003, Bull. No. 3 (Ukraine), US Pat. No. 2172545, 08.20.2001, Bull. No. 23 (Russia), US Pat. No. 2211514 (08.27.2003, Bull. No. 24, Russia), US Pat. No. 2210149 (08/10/2003, Bull. No. 22, Russia), US Pat. DE No. 4014099 A1, (07.11.91, Germany), European Pat. EP No. 1227558 (Bulletin, 2003/31) and others.

According to the greatest number of similar features similar to those of the claimed product, and the use of a vacuum circuit breaker of the BP series, the switchgear according to US Pat. No. 2210149 (Russia), and for the prototype - cabinets of the ZS1 series manufactured by ABB Germany (US Pat. DE No. 4014099).

The proposed product, like the prototype, consists of the following main parts: relay compartment, drawer compartment, busbar compartment, linear busbar compartment, earthing switch, bushings.

Designers and manufacturers of switchgear are well-known requirements for regulatory and technical documentation, and operating requirements.

For example:

1. According to the primary connection diagrams, in the cable compartment of the switchgear cabinet, cable sections of power cables, current transformers and linear buses must be simultaneously placed [5-6];

2. Access to the secondary circuits of current and voltage transformers permanently installed in the cable compartment of the cabinets for one-sided (frontal) service should be made from the front side without dismantling the structural elements of the switchgear cabinet [1];

3. The dismantling of current and voltage transformers should be carried out without dismantling the cabinet structural elements and be as simple as possible;

4. Maintenance of cable sections of power cables in switchgear cabinets of one-sided (frontal) service should be carried out from the front and carried out without dismantling the cabinet structure;

5. The size of the cable compartment should allow cutting at least three three-phase cables using typical cable cuts of the type KVED-6/10, KVV-6/10, KVR in compliance with the required dimensions for safe operation [8].

Significant disadvantages of the prototype should include the fact that the layout of the cabinet series ZS1 acc. Clause 1 does not allow to implement a circuit with simultaneous placement of cable cuts of power cables, current transformers, voltage and linear buses. This condition is met by the presence of two cabinets, and this leads to an increase in the overall dimensions of the substation and increases the price of products for the consumer.

The disadvantage of the prototype according to claims 3 and 4 is due to the very complicated approach from the front to the current, voltage and transformers of their secondary circuits without disassembling the busbar and disassembling the cables. It is necessary to remove the compartment wall, the cable connection bus, and disconnect the cables from the busbar. These operations require a large amount of work to dismantle structural elements, and after work with transformers, a significant amount of work is required to retest cable connections. In the prototype, this is due to the structural layout of the cable compartment with the placement of current and voltage transformers on the rear frame of the cabinet.

The disadvantage of the prototype is also the fact that (according to Clause 5) the cable compartment in the basic version is designed for connecting and cutting single-core cables that require the same dimensions from the point of attachment of the core to the cable contact. At the same time, connecting three-core cables with the most commonly used cuts in operation requires significantly larger installation dimensions for convenient and safe operation by the consumer.

In order to access the cables of the prototype, it is necessary to roll out the sliding element with the vacuum circuit breaker to the repair position, to dismantle the partition that separates the drawer compartments and the cable compartment.

The listed disadvantages of the prototype significantly limit the scope of such a switchgear at facilities where the project is based on standard, generally applicable solutions of grids of main connection schemes.

Layout of substations with cabinets with one-sided maintenance requires convenience, ease of installation, maintenance, technological inspections, routine maintenance and scheduled repairs of switchgear. The prototype has complicated access to cabinet elements - transformers, cable cuts. Access and replacement of these elements is accompanied by a significant amount of dismantling and, accordingly, assembly of structural elements.

The basis of the invention is the task of creating a new type of switchgear cabinet with increased safety of operational one-sided service, primarily current transformers and ground electrode system.

The task is achieved in that in a complete switchgear containing a frame, a relay compartment, a drawer compartment, a busbar compartment, a withdrawable element with a switch, current transformers, linear buses, voltage transformers, an earthing switch, a cable compartment and power cables with cutting, when between the drawer compartment and the cable compartment there is a partition, according to the invention, current and voltage transformers, an earthing switch, linear busbars and power cables are placed in a cable compartment with their cutting capacity, while the partition between the drawer compartment and the cable compartment is removable and a current transformer is installed on it with the possibility of rotation around its axis by 90 degrees towards the drawer compartment to move from its working position to the repair one, providing access to it secondary circuit contacts. The earthing switch installed stationary under the withdrawable element in the cable compartment has the ability to inspect, repair and quickly replace the components of the nodes and parts of the interlocks without dismantling the structural elements of the switchgear.

The task is achieved due to the fact that voltage transformers are located in the cable compartment on the bottom, linear busbars are located in the rear part, and power cables with cable cutting are located in the front part of the cabinet.

The proposed design allows for the presence of air insulation between the conductive busbars to provide unilateral service cabinet. The special design of the sliding element with a switch mounted on the frame structure in the middle part of the cabinet has the ability to move with the switchgear closed from the working position to the control position and, conversely, lock it in these positions while maintaining the locking, control, and alarm systems. In the repair position, the retractable element is located on a special inventory trolley in the service corridor.

The proposed switchgear was developed using new design solutions that completely eliminated the aforementioned disadvantages of the prototype, while not only technical and operational parameters were saved, but also overall dimensions, and at the same time the highest degree of requirements for safe and convenient operation by the consumer was achieved. The possibility of using the new cabinet layout with the original placement of the cable compartment elements, which creates excellent opportunities for servicing current transformers and an earthing switch (quick-acting with a spring drive), the placement of a sliding element above the cable compartment and a number of other design innovations, as a result of the goal, is, according to the developers, advantage over similar types of switchgear and prototype. These solutions have been successfully resolved in the proposed switchgear.

Other objectives and advantages of the present invention will become apparent from the following detailed description of an example of its implementation and the accompanying drawings, in which:

figure 1 depicts a switchgear cabinet with a sliding element with a switch in the working position, a current transformer, voltage and ground electrode;

figure 2 - access to the elements of the cabinet;

figure 3 - replacement of the current transformer;

figure 4 - grounding.

The switchgear cabinet (Fig. 1) consists of the following main parts: A - relay compartment, B - drawer compartment, C - busbar compartment, G - cable compartment.

Position I - corresponds to the placement of current transformers in the switchgear, and position II - installation of an earthing switch (quick-acting with a spring drive) in the switchgear cabinet.

Access to the cabinet elements, in particular to the current transformers installed in the frame 1 (Fig. 2, position I), is carried out by rolling out the sliding element with the switch 3 installed on the inventory trolley 4, having previously opened the door 2 (compartment of the sliding element) and door 5 cable compartment. This frees up access (indicated by arrows) to cable cutting 6, voltage transformer 7, ground electrode 8, current transformer 9 and cover 10, which is freely dismantled, freeing free access to the contacts of the secondary circuits of current transformers 9. A current transformer 9, a voltage transformer 7, an earthing switch 8, linear buses and power cables are placed in the cable compartment with the possibility of their cutting.

Replacement of the current transformer 9 installed in the frame 1 (Fig. 3, position I) is carried out with doors 2 open, while the switch 3 on the inventory trolley 4 is located in the service corridor, and the easily removable partition 11 located between the drawer compartment and the cable compartment dismantled. The voltage transformer 7 and the ground electrode 8 are serviced by the repair services permanently. To service the contacts of the secondary circuits of the current transformers 9 (Fig. 3) or replace it, it is enough to dismantle the busbar fastener 12 on the busbar of the phase being repaired and the fasteners 15 on the supporting structure of the frame frame 1. Turning the current transformer unit 9 (Fig. 3) with the bus 13 and the passage sleeve 14 around the axis towards the compartment of the withdrawable element 90 degrees to the repair position, the current transformer 9 is available for maintenance (repair, replacement, etc.).

The earthing switch 8 (Fig. 1, position II), depending on the schemes, can be located (in this diagram) under the withdrawable element compartment in the cable compartment and is driven by the removable handle of the earthing switch 8. The earthing switch 8, as an integral part of any switchgear, is generally designed for guaranteeing the safe work of maintenance personnel during scheduled and routine maintenance operations that occur during the operation of switchgear cabinets.

When the earthing switch 8 is turned on, it is impossible to roll the sliding element with the switch 3 from the control position to the intermediate position and then to the working position. In this case, the unlocked door 2 of the drawer compartment can be easily opened.

When the earthing switch 8 is off, the door 5 of the cable compartment is blocked by a special mechanism.

The main components and parts of the ground electrode 8 (Fig. 4, position II) consist of: a block of grounding knives 16, which includes a shaft 17 with on / off springs (not shown in Fig.), A latch 18, grounding plates 19, insulators 20 with integrated terminals for an indicator of the presence of voltage (not shown in Fig.), tires 21 are connected to the busbar main circuit busbar, contacts 22, an optional padlock 23 for additional mechanical locking, worn in separate holes of the channel 24 and sector 25. On the shaft end 26 drive s earthing switch 8 is installed a removable handle for controlling the earthing switch 8. The switch 27 way interacts with the locking sector 28, the electromagnet 29, interacting with the sector 30, blocks the aforementioned drive shaft of the earthing switch 8.

The proposed technical and constructive solutions made it possible to improve the overall dimensions and technical and operational indicators and create a new series of switchgear cabinets under the brand name of the manufacturer, namely: KU-10S with rated currents of up to 3150 A and rated breaking currents of 40 kA in general industrial design and KU- 6C - with the same parameters, but in earthquake-resistant design for thermal and nuclear power plants.

The prototypes of switchgear cabinets manufactured at RZVA after all the electromechanical tests (SIC VVA, Moscow) fully confirmed their reliable performance and can be recommended for operation in the national economy at electric power facilities.

Claims (2)

1. A complete switchgear (switchgear) containing a frame, a relay compartment, a drawer compartment, a busbar compartment, a withdrawable element with a switch, current transformers, linear buses, voltage transformers, an earthing switch, a cable compartment, and power cables with cuts, while between the drawer compartment and the cable compartment have a partition, characterized in that the current and voltage transformers, an earthing switch, linear busbars and power cables are placed in the cable compartment with the possibility of their cutting, while odka compartment between the sliding element and cable compartment is detachable and installed therein CT rotatably around its axis by 90 ° in the direction of the sliding cover member to move from its working position to repair. 2. The complete switchgear according to claim 1, characterized in that the earthing switch is installed stationary under said current transformer in the cable compartment with the possibility of inspection, repair and quick replacement of nodes and parts of the earthing locks without dismantling the switchgear structural elements.

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