RU114563U1 - CAMERA COMBINED ONE-SIDED SERVICE KSO-310 - Google Patents

Abstract

A single-sided service prefabricated chamber containing a high-voltage switch or load switch, current transformers and fuses, characterized in that the frame of the chamber consists of prefabricated structures, in the back of which there is a vacuum circuit breaker or load switch in a single block with a disconnector, fuses and an earthing switch, which can be isolated from the top of the busbars by a partition, the mechanical interlocking system provided for by the design of the vacuum circuit breaker prevents the disconnector from being turned on and off when the high-voltage circuit breaker is on, interlocking that prevents the earthing switch from being turned on when the disconnector's working blades are on, interlocking that prevents the earthing switch from being turned on when the disconnector is on, interlocks , which do not allow the high-voltage circuit breaker to be turned on when the disconnector is in the intermediate position, interlocking that prevents the high-voltage compartment door from opening when the high voltage switch.

Description

The technical solution relates to the field of electrical engineering, namely to high-voltage switchgear (KRU), designed to receive and distribute electrical energy of three-phase alternating current. One-way service prefabricated chambers (KSO chambers) with a voltage of 6 and 10 kV belong to the field of electrical engineering and are intended for three-phase alternating current distributors with a frequency of 50 Hz of systems with isolated neutral or grounded through an arcing reactor.

KSO-395 series cameras are known from the existing level of technology (MEL OJSC, the operating manual is published on the website http://www.zavodmel.rn/download/0/RE-KCO-395.pdf), in which the main switching devices are applied:

A. Auto-gas circuit breakers of the type VNAP, manufactured by OJSC MEL or similar from other manufacturers;

B. Vacuum switch-disconnectors type VNVR-10 “VOLNA”, manufactured by OJSC “Argon” (Saratov Region) http://oao-argon.ru/:

B. Vacuum circuit breaker BB / TEL-10-20, manufactured by ZAO GK Tavrida Electric, Moscow http: //www.tavrida.rn.

The disadvantages of the KSO-395 camera are the use of these switching devices and the associated layout and structural solutions, namely:

1. As part of the load switch, a vacuum arcing chamber is used, which only breaks the arc when the load is disconnected, its operation is associated with the operation of the disconnector knives, which affects the reliability of the switching device as a whole.

2. Insulation (insulating partitions, rods) is made of fiberglass - material, the use of which the consumer is negative, because its high hygroscopicity often leads to electrical breakdown on the surface.

3. Fuses are installed separately from the load switch, which significantly increases the space occupied by the main devices in the KSO-395 chamber.

4. Two drives are required to control the main and ground knives of the load switch. As a result of this, in order to exclude incorrect operations (turning on the grounding knives with the main ones turned on and vice versa), an additional locking mechanism is required.

5. The vacuum circuit breaker used in KSO-395 has an electromagnetic drive, the disadvantage of which is the inability to manually turn on in the absence of operating voltage. Since the KSO-395 series cameras are used on small TPs, RTPs, where provided operational power is not provided, this drawback is significant.

6. The load and break switches used in KSO-395 of different manufacturers have a fundamentally different design, which entails additional difficulties for the consumer during their maintenance and operation.

7. When using the BB / TEL switch, it is mandatory to install an additional disconnector to ensure a visible gap (the requirement of regulatory documents).

8. The presence of separately installed circuit breaker and disconnector entails the installation of an additional blocking system between them during assembly of the KSO-395 camera (prohibition of operating the disconnector with the switch on, prohibition of turning on the switch when the disconnector is in the intermediate position).

The design differences of the KSO-310 series camera from the prototype are as follows:

1. In the design of the applied load switch, a full-fledged vacuum arcing chamber is used, which is constantly included in the main circuit, a preload system, classical for vacuum circuit breakers, is used, there are no insulating interphase partitions.

2. As part of the applied circuit breaker or load switch, there is a built-in disconnector and an earthing switch, which allows to reduce the space occupied by the main devices in the KSO-310 chamber, to reduce maintenance costs by reducing the number of devices used.

3. Fuses are installed on the main disconnecting knives of the load switch; their presence or absence does not affect the layout of the KSO-310 camera.

4. The control of the main and grounding knives of the switch-disconnector of the load switch is carried out by one drive (ON. Main knives - OFF all - ON grounding knives). As a result of this, additional locks in the KSO-310 camera are not required. All the necessary locks are already included in the design of the switch, including the KSO-310 camera door locking mechanism.

5. The switch with a spring drive can be turned on manually in the absence of operational power at the substation.

6. The load and break switches used in KSO-310 have a common basic construct, they differ only in some elements (vacuum chambers, preload springs, fuses). The use of the same type of apparatus reduces the costs of maintenance and operation, simplifies the training of operating personnel.

The technical result, which this technical solution is aimed at, is to improve the technical and economic characteristics of the camera, the optimal arrangement of structural elements, reducing the dimensions of the camera, and improving its design.

According to the claimed technical solution, this is achieved by the use of a vacuum circuit breaker (or vacuum circuit breaker), which is a single functional unit consisting of:

1. Vacuum extinguishing chambers with preload nodes, capable of disconnecting, depending on the version, the rated load current or short circuit current.

2. Disconnector, providing a visible break in the high voltage circuit.

3. A set of high-voltage fuses with a circuit breaker tripping device when one of the fuses trips.

4. Earthing switch with quick start mechanism.

5. A spring-motor drive that allows you to operate the switch in manual and automatic mode.

The proposed technical solution is illustrated by the drawing, which shows a General view of the switchgear cell. A vacuum switch (or vacuum load switch) is located at the rear of the KSO chamber.

For manual control of the high-voltage switch, disconnector and ground electrode, a drive unit is installed on the front panel of the KSO camera (5, Fig. 1). Management is carried out using a removable handle (4).

The metal construction of the KSO chamber is made of galvanized sheet bent profiles, interconnected by mechanical riveting. Inside the KSO chamber, the main circuit equipment, protection and control circuits are located.

On the front side of the KSO chamber are located: on the door of the low-voltage compartment (12) - protection, metering and measurement devices, on the side panel - control drives for the high-voltage switch (7), disconnector (3) and ground electrode (9).

Two doors provide access to the KSO chamber: the upper (12) -to the low-voltage compartment “A”, the lower (11) to the high-voltage compartment “B”, which houses the high-voltage switch (7), fuses (3) and current transformers (10 )

The high-voltage (B) and low-voltage (A) compartments are separated by a continuous metal partition. Auxiliary circuit equipment is located in the low-voltage compartment (A).

A removable insulating partition (2) is installed between the high-voltage switch (7) and the busbars (1), which prevents access to the high-voltage zone when servicing the high-voltage compartment (V) or replacing fuses (3).

On the door of the KSO camera (11) there is a viewing window for viewing the inside of the camera.

The following locks were made in the KSO chamber:

- blocking that does not allow switching on and off of the disconnector when the high-voltage switch is turned on;

- blocking that does not allow the inclusion of grounding knives when the operating knives of the disconnector are turned on;

- blocking that does not allow the inclusion of disconnectors when the grounding knives are on;

- blocking, preventing the inclusion of a high-voltage switch when the disconnector is in an intermediate position;

- a lock that prevents the door of the high-voltage compartment from opening when the high-voltage switch is turned on;

The KSO chamber also provides the ability to install locks.

On the facade of the chamber in the lower part there is a grounding clamp, designed to connect elements temporarily to ground to the grounded housing. The upper door, on which the auxiliary circuit devices are installed, is grounded by a flexible wire.

In the KSO chamber there is a device for installing an internal lighting lamp (36 V incandescent lamp), which makes it possible to safely replace a burned out lamp without removing the voltage.

Busbars (1) of the KSO chamber have solid barriers from the front and from the top.

The KSO chamber consists of prefabricated elements: sidewalls and internal partitions, connecting elements, compartment doors. Elements are assembled through bolted connections.

Inside the chamber, in the rear, there is a vacuum circuit breaker (or a vacuum circuit breaker) (7), which is connected via a disconnector (3) to the busbars (1) on the one hand and through the current transformers (10) the cable (8) is connected .

The CSR chamber operates as follows: a vacuum circuit breaker (or a vacuum circuit breaker) (7) automatically or by means of a manual drive (5) turns off and turns on the main circuits in the chamber.

The disconnector (3) are used to create a visible break in the main circuit and grounding for safety purposes when working in the CSR chamber.

Current transformers (10) provide protection and measurement circuits.

Claims (1)

The chamber is a one-way service assembly containing a high-voltage switch or load switch, current transformers and fuses, characterized in that the frame of the camera consists of prefabricated structures, in the back of which there is a vacuum switch or load switch in a single unit with a disconnector, fuses and ground electrode, which can to be isolated from the busbars located on top by a partition; the mechanical interlock system provided by the design of the vacuum circuit breaker is not allowed It switches the disconnector on and off when the high-voltage circuit breaker is turned on, a lock that prevents the earthing switch from being turned on with the disconnector working knives turned on, a lock that prevents the earthing switch from turning on when the disconnector is turned on, locks that prevent the high-voltage switch from being turned on when the disconnector is in the intermediate position, blocking, not allowing the door to open the high voltage compartment when the high voltage switch is turned on.