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KYN28A-24 indoor metal armored removable switchgear

Category: High Voltage Switchgear

Description: It mainly produces all kinds of high, medium and low voltage switchgear. Since its establishment, it has developed rapidly with the support of the majority of users. At present, it has a number of advanced machinery and equipment production lines and a scientific research and management team composed of middle and senior talents with rich experience and strong technical force. Technological level and product quality, to better serve our customers.

Keywords: high-voltage switchgear, medium-voltage switchgear, low-voltage switchgear, box-type substation, integrated distribution station

Product Details

Main purpose

KYN port-24 type indoor metal armored removable switchgear (hereinafter referred to as switchgear) is a 20—24kv three-phase AC 50Hz single bus breaking

The complete set of power distribution devices of the system are mainly used for power transmission of small and medium generators in power plants, power distribution in industrial and mining enterprises, and power reception and power transmission of secondary substations of power systems and starting of large high-voltage motors. For control, protection and detection. This switchgear meets the requirements of IEc62271—200, GB3906, DL, T404: 1997 and other standards. It can prevent the push-pull circuit breaker handcart with load, prevent the circuit breaker from being opened and closed by mistake, and prevent the grounding switch from closing the circuit breaker when it is in the closed position. The interlocking function of mistakenly charged compartment and preventing mistakenly closing the grounding switch when electrified. Equipped with the ZN port-24 vacuum circuit breaker produced by our company, the maximum rated current reaches 2500A. The maximum rated closing current reaches 31.5kA, and has type test reports that meet the standards of IEc62271—100 and IEc62271—200.

Use ambient conditions

1. Altitude: no more than 1000 meters;

2. Ambient temperature: upper limit +40℃, lower limit -10℃;

3. Relative humidity: the average value of the mouth is less than 95%, and the monthly average value is not more than 90%;

4. Installation site: The earthquake intensity is less than 8 degrees;

5. Environmental conditions: The surrounding air should not be significantly polluted by corrosive or flammable gas, water vapor, etc., without serious pollution and frequent violent vibration. Severity design meets Category 1 requirements under severe conditions.

Note: When the above normal use conditions are exceeded, the user can negotiate with the manufacturer.

Model and meaning


KYN28A-24 indoor metal armored removable switchgear


Main technical parameters

Technical parameters of switchgear


KYN28A-24 indoor metal armored removable switchgear


Advanced inspection equipment guarantees high quality products


KYN28A-24 type indoor metal armored removable switchgear


KYN port-24 vacuum circuit breaker technical data


KYN28A-24 Indoor Metal Armored Removable Switchgear


Technical data of KYN port-24 vacuum circuit breaker spring operating mechanism


KYN28A-24 Indoor Metal Armored Removable Switchgear


Main structural features

The switchgear is designed according to I.EC62271—200 and GB3906—2006 "3.6—40.5kV AC metal-enclosed switchgear and control equipment" and other standards. The whole is composed of two parts: the cabinet body and the central removable part (ie the handcart). The cabinet is divided into four separate compartments, the protection level of the shell is IP4X, and the protection level of each compartment and the circuit breaker door is IP2X when the door is opened. It has overhead inlet and outlet lines, cable inlet and outlet lines and other functional schemes. After being arranged and combined, it can become a power distribution device in various schemes. The switchgear can be installed, debugged and maintained from the front, so it can be double-arranged back-to-back and installed against the wall, which improves the safety and flexibility of the switchgear and reduces the floor space.


KYN28A-24 Indoor Metal Armored Removable Switchgear


Shell and more

The shell of the switchgear is made of imported aluminum-zinc-coated thin steel plates, processed by CNC machine tools, and adopted multiple composite folding processes, so that the entire cabinet has high precision, strong anti-corrosion and anti-oxidation effects. And because of the multiple folding process, the cabinet is lighter in weight, higher in mechanical strength and beautiful in appearance than other similar equipment cabinets. The cabinet adopts an assembled structure, which is connected by rivet nuts and high-strength bolts. In this way, the processing and production cycle is short, the parts and components are versatile, and the floor space is small, which is convenient for organizing production.


The skeleton of the handcart is also assembled from thin steel plates after being processed by CNC machine tools. The handcart and the cabinet are insulated together, and the mechanical interlock is safe, reliable and flexible. According to different uses, the handcart is divided into circuit breaker handcart, voltage transformer handcart, metering handcart, isolation handcart, and handcarts of the same specification can be completely interchangeable. The handcart has a disconnection position, a test position and a working position in the cabinet. Each position has a positioning device to ensure reliable interlocking. It must be operated according to the interlocking anti-misoperation procedure. All kinds of handcarts are driven and withdrawn by worm gear and worm. Its operation is light and flexible, and it is suitable for various duty personnel to operate. Various inspection and maintenance; and the use of the middle type, the whole handcart is small in size, convenient for inspection and maintenance.

The circuit breaker trolley is equipped with real circuit breakers and other auxiliary equipment. When the handcart enters the circuit breaker room of the cabinet, it can be reliably locked in the disconnecting position or the test position; and on the instrument door of the cabinet: there is a position indicator to show its position. And only after it is completely locked, the propulsion mechanism can be shaken to push the cart to the working position. After the handcart reaches the working position, the push handle will not shake, and the position indicator light shows its position. The mechanical interlocking of the handcart can reliably ensure that the circuit breaker can only be closed or opened when the handcart is in the working or test position. brake; and the day. handcart is only in the open state, the circuit breaker can move.


The main electrical components of switchgear have their own independent compartments, namely: circuit breaker handcart room, bus bar room, cable room, relay instrument room, and the protection level of each compartment reaches IP2x; except for the relay room, the other three The compartment parts respectively have their pressure relief passages. Since the circuit breaker adopts a central structure, the location of the cable room is greatly increased. Therefore, the equipment can be connected to multiple cables.

Circuit Breaker Room

Tracks are installed on both sides of the cabinet, for the handcart to move and slide from the disconnected position or the test position to the working position. The partition (valve) of the static contact box is installed on the back of the handcart room. During the process of moving the handcart from the disconnected position or the test position to the working position, the shutters on the upper and lower static contacts are linked with the handcart and automatically open at the same time; when the handcart moves in the opposite direction, the shutters are automatically closed. Until the handcart retreats to a certain position and completely covers it as a static contact box to form an effective isolation. At the same time, because the upper and lower valves are not linked, the valve on the live side can be locked during maintenance, so as to ensure that maintenance personnel do not touch the live body. When the circuit breaker door is closed, the handcart can also be operated. The position of the indoor handcart, closing and opening display and energy storage status.

Bus segregation

The main bus is a single splicing and interconnecting connection. Fixed by branch bus and static contact box. The main busbar and the connecting busbar are copper bars with rectangular section. The branch busbar is connected to the static contact box and the main busbar by bolts, and no other support is required. For special requirements, busbars can be covered with heat-shrinkable sleeves and coupling bolt insulating sleeves and end caps. The busbars of adjacent cabinets are fixed with bushings. In this way, the air buffer reserved between the busbars is connected. When an internal fault arc occurs, it can prevent it from penetrating and melting, and the bushing can effectively limit the accident to the compartment instead of spreading to other cabinets.

Cable compartment

The switchgear adopts the central type, so the cable room has a large space, the current transformer and the grounding switch are installed on the rear wall of the compartment, and the arrester is installed in the compartment. After removing the handcart and the withdrawable horizontal partition, the construction personnel can access the cabinet from the front for installation and maintenance. The cable connection conductors in the cable house, each phase can be connected with 1 to 3 single-core cables, and if necessary, each phase can be connected with 6 single-core cables. Magnetic conductive metal sealing plate ensures convenient construction.

Relay meter channel D

Relay protection components, meters, live monitoring indicators, and secondary equipment with special requirements can be installed in the instrument room. The control circuit is laid in the trunking with enough space, and there is a metal cover, which can isolate the secondary line from the high-voltage room. The left wire slot is reserved for controlling the entry and exit of the small busbar, and the small wire inside the switchgear itself is laid on the right side. On the top plate of the relay instrument room, there are also small busbar crossing holes for easy construction. When wiring, the top cover of the instrument room can be turned over to facilitate the installation of small busbars.

Prevents misuse of interlocks

The switchgear is equipped with a safety interlocking device, which fully meets the requirements of "five-proof".

1. The door of the instrument room is equipped with a prompt button or a KK switch to prevent the circuit breaker from being closed or opened by mistake.

2. When the handcart of the circuit breaker is in the test or working position, the circuit breaker can only be closed and opened, and after the circuit breaker is closed, the handcart cannot move, which prevents the circuit breaker from being pushed and pulled with load by mistake.

3. Only when the grounding switch is in the off position, the circuit breaker handcart can move from the test off position to the working position. Only when the circuit breaker trolley is in the test/disconnect position, the grounding switch can be closed (the grounding switch can be equipped with a voltage display device). In this way, it is possible to prevent the grounding switch from being switched on incorrectly and to prevent the grounding switch from closing the circuit breaker in the closed position.

4. When the grounding switch is in the off position, the lower door and the rear door cannot be opened to prevent accidental electrification.

5. When the circuit breaker handcart is in the working position, the secondary plug is locked and cannot be pulled out.

6. Each cabinet can be equipped with electrical interlock.

Pressure relief device

Pressure relief devices are installed above the handcart room of the circuit breaker, the bus bar room and the cable room. When an internal fault arc occurs in the circuit breaker or the bus bar, with the appearance of the arc, the air pressure inside the switchgear will rise, and it is installed in the The special sealing ring of the door closes the front of the cabinet, and the pressure relief metal plate equipped on the top is automatically opened to release the pressure and discharge the gas to ensure the safety of the operator and the switch cabinet.

The secondary plug is interlocked with the position of the handcart

The connection between the secondary line on the switchgear and the secondary line of the circuit breaker handcart is achieved through the manual secondary plug. The moving contact of the secondary plug is connected to the handcart of the circuit breaker through a nylon bellows expansion tube, and the secondary static contact seat is installed at the upper right of the handcart room of the switch cabinet. When the circuit breaker handcart is in the working position, it is mechanically interlocked, the secondary plug is locked and cannot be released, because the closing mechanism of the circuit breaker handcart is locked by the electromagnet , the circuit breaker handcart can only be opened before the secondary plug is connected, so it cannot be closed

Charged Display

If required by the user, the switchgear can be equipped with an optional item to detect the operation of the primary circuit, that is, a live display device. The device is composed of a high-voltage sensor and a portable display, which are connected together by an external conductive wire. The device can not only indicate the live state of the high-voltage circuit, but also cooperate with the electromagnetic lock to realize the forced locking of the switch handle and prevent the grounding switch from being turned off when electrified. , to prevent the mistakenly charged separation, thereby improving the anti-error performance of the supporting products.

Prevents condensation and corrosion

In order to prevent the danger of condensation in the climate environment with high humidity or large temperature change, an automatic dew condensation controller is installed in the instrument room, and heating is installed in the circuit breaker room and the cable room respectively. for use in the aforementioned environments and to prevent corrosion.

Grounding device

A 5×30mm grounding copper bar is set up separately in the cable room, which can run through the adjacent cabinets and make good contact with the cabinet. This grounding bar is used for components that are directly grounded: at the same time, since the entire cabinet is connected with aluminum-zinc plates, the entire cabinet is in a good grounding state to ensure that the operator can touch the cabinet umbrella.

Installed on Debug

Basic form

The construction of the installation foundation of the switchgear shall comply with the relevant provisions of the "Technical Specification for Electric Power Construction Construction and Acceptance".

The installation foundation of switchgear generally needs to pour concrete in two steps. The first time is to install the components of the switchgear, namely angle steel or square steel, and channel steel components to install the foundation, and the second time to pour concrete is the supplementary layer of the ground, with a general thickness of 60mm. 1~3mm.

See Figure 4 for the installation diagram of the switchgear foundation.

Ensure the installation quality when installing the basic frame. The technical standard for frame installation is 1 square meter with a tolerance of 1 mm.

Installation of switchgear

See Figure 3 for the installation base dimensions of the switchgear

When the cabinet is in a single row, the appropriate length of the corridor in front of the cabinet is 2.5 meters. When the cabinet is arranged in two rows, the appropriate operation corridor is 3 meters.

The switchgear should be transported to their specific position as indicated on the project needs and drawings. If there is a long row of switchgear (more than 10 units), the cabinet consolidation work should start from the middle part.

During the transportation of switchgear, special means of transportation such as crane should be used. It is strictly forbidden to use a roller crowbar; and it is strictly forbidden to push the circuit breaker handcart into the cabinet to carry it together. The circuit breaker handcart (and other handcarts) can only be entered into the corresponding compartment after the cabinet is installed.

Install switchgear one by one. Including both horizontal and vertical. The unevenness of switchgear installation shall not exceed 2mm.

When the switchgear has been completely assembled (spliced), M12 anchor bolts can be used to connect it to the foundation or to weld it firmly to the foundation frame.

Installation of busbars

The busbars in the switchgear are all rectangular busbars and are in the form of segments. When selecting different currents, the selected busbars are only different in number and specifications, so the following steps must be followed during installation:

Wipe the busbar with a clean and dry soft cloth, check whether the insulating sleeve is damaged, and apply conductive paste or neutral vaseline to the connection part

Install the busbars one by one cabinet, connect the busbar section and the corresponding branch busbars together, insert appropriate spacers when bolting, and tighten them with bolts.

Grounding device for switchgear

Use the preset connection board to connect the ground busbars of each cabinet together.

Connect all leads that need to be grounded inside the switch.

Connect the base frame to the grounding bar. If there are more than 10 cabinets ttl~l, there must be more than two grounding points.

The grounding wire of the grounding switch is connected to the grounding busbar of the switchgear.

See inspection after switchgear installation

After the switchgear is installed in place, remove the dust or sundries on the equipment in the cabinet, then check whether all the fastening bolts are loose, push and push the circuit breaker in the cabinet, and perform the opening and closing actions, observe If there is any abnormality, check whether the secondary wiring is correct according to the circuit diagram, adjust the relay, and check whether the interlock is effective.


KYN28A-24 type indoor metal armored removable switchgear


Use and maintenance

While the switchgear is in operation, operators should not only abide by the relevant regulations, but also pay attention to the following issues

Although the switchgear is designed to ensure the correct interlocking of the operation procedures of each part of the switchgear, the operator should still strictly follow the requirements of the operating procedures and technical documents for the input and withdrawal of each part of the switchgear, and should not arbitrarily When the operation is blocked, it should not be forced to operate without analysis, otherwise it will easily cause equipment damage and even cause accidents.

Operation of a circuit breaker panel without a ground wire

a. Push the removable parts of the circuit breaker into the cabinet: Before the circuit breaker trolley is ready to be pushed from the outside of the cabinet into the cabinet, you should carefully check whether the circuit breaker is in good condition, whether there are missing parts, and whether there are tools and other sundries Put it in the mechanism box or switch. After confirming that there is no problem, install the trolley on the transfer car and lock it. Push the transfer car to the front of the cabinet, raise the car to a suitable position, and insert the positioning lock plate at the front of the transfer car into the cabinet. After the board socket and the transfer vehicle are locked with the cabinet, open the locking hook of the terminal trolley, and push the trolley smoothly into the cabinet to lock it at the same time. After confirming that the trolley and the cabinet are locked, unlock the transfer car and the cabinet, and push the transfer car away

b. The trolley is operated in the cabinet: after the trolley is loaded into the cabinet from the transfer car, it is in the disconnected position in the cabinet. If you want to put the trolley into operation, first place the trolley in the test position, and plug the auxiliary circuit plug into the cabinet. Well, if the power is turned on, the test position indicator light on the panel of the instrument room will be on. At this time, the electric operation test of the trolley can be carried out when the main circuit is not connected. If you want to continue the operation, you must first close all the cabinet doors and insert the key Door lock hole, lock the door, and confirm that the circuit breaker is in the open state (see item d). At this time, insert the handle of the handcart into the operation hole on the middle panel, and turn the handle clockwise until the handle is obviously blocked. Hear the crisp auxiliary switch switching sound, and at the same time, the working position indicator light on the panel of the instrument room is on, and then remove the crank handle. At this time, the main circuit is connected and the circuit breaker is in the working position, and it can be combined and divided by controlling the same circuit.

If you are going to withdraw the trolley from the working position, first of all, you should confirm that the circuit breaker is in the open state of f (see item d), insert your hand to operate the crank handle, turn it counterclockwise until the crank handle is blocked and hear a clear assist With the sound of switch switching, the car returns to the test position. At this point, the main circuit has been completely disconnected, and the metal valve is closed.

c. Take out the trolley from the cabinet: If you are going to take out the trolley from the cabinet, you should first make sure that the trolley is in the test position, then release the auxiliary stab head, and lock the movable plug on the handle frame. When the transfer car is in front of the cabinet (same as when loading the car into the cabinet), then unlock the handcart and pull it out. When the handcart completely enters the transfer car and confirm that the transfer year is locked, release the connection between the transfer car and the cabinet. Lock it, pull the transfer afternoon back a proper distance, and then stop it slowly. If the car is to be transported for a long distance by a transfer vehicle, be extra careful during the process of pushing the transfer vehicle to avoid accidents during transportation.

The opening and closing status of the circuit breaker can be determined by the handcart of the circuit breaker, the opening and closing indicator on the board and the instrument room and the opening and closing indicator on the board.

If you see the handcart panel J through the observation window of the middle panel of the cabinet: the green opening indicator, it is determined that the circuit breaker is in the opening state. If the auxiliary circuit is energized, the opening indicator on the instrument room and the panel is on:

If you see the red closing indicator on the panel of the handcart through the observation window in the cabinet, it is determined that the circuit breaker is in the closed state. At this time, if the auxiliary circuit is energized, the closing indicator on the panel of the instrument room will be displayed. Light.

Operation of circuit breaker cabinets with earthing switches

The procedure of pushing the circuit breaker trolley into the cabinet and taking it out from the cabinet is exactly the same as the operation procedure of the circuit breaker cabinet without grounding switch. Only if the handcart is in the cabinetThe points to be paid attention to during the operation and during the operation of the grounding switch are described as follows:

a. The operation of the handcart in the cabinet

When preparing to push the handcart to the working position, in addition to complying with the requirements drawn for attention in Article 5.1.1 b of Use and Maintenance, it is also necessary to confirm that the grounding switch is in the dry opening state, otherwise the The step operation could not be completed.

To close and disconnect the grounding switch, firstly, make sure that the vehicle has retreated to the test/disconnect position, remove the push handle, and then press the interlocking bent plate at the operating hole of the grounding switch, insert the operating handle of the grounding switch, and follow the When the hour hand rotates 90 degrees, the grounding switch is closed. If it is turned 90 degrees counterclockwise, the grounding switch is the opening operation.

General Isolation Cabinet Operation

Isolation trolleys are not allowed to operate under load. When operating in the isolation trolley cabinet, it must be ensured that the matching circuit breaker is opened first, and at the same time, after the circuit breaker is opened, its auxiliary contacts are switched to release the electrical interlock on the matching isolation trolley. The isolation car can only be operated when the circuit breaker is operated; the specific operation procedure is the same as that of the circuit breaker handcart:

Notes on using interlocks

The interlocking of this product is mainly based on mechanical interlocking, supplemented by electrical interlocking to achieve the "five-proof" locking requirements. However, operators should not ignore the requirements of operating procedures because of this. Only the combination of procedures and technical means can effectively play the role of the interlocking device and prevent misoperation accidents.

The input and release of the interlock function of this product are mostly realized at the same time during normal operation. No additional operation steps are required. If it is found that the operation is obstructed (such as the increase of operating resistance), you should first check whether there is a possibility of misoperation, and should not force the operation to damage the equipment, or even lead to misoperation accidents.

Some interlocks allow emergency unlocking due to special operational needs (such as the interlocking of the lower panel of the cabinet and the grounding switch). The use of emergency unlocking must be cautious and should not be used frequently. Necessary protective measures should also be taken during use. Once the treatment is completed, the original state of the interlock should be restored immediately.

One Time Program


KYN28A-24 indoor metal armored removable switchgear



KYN28A-24 indoor metal armored removable switchgear



KYN28A-24 Indoor Metal Armored Removable Switchgear



KYN28A-24 indoor metal armored removable switchgear



KYN28A-24 type indoor metal armored removable switchgear



KYN28A-24 indoor metal armored removable switchgear



KYN28A-24 indoor metal armored removable switchgear



KYN28A-24 Indoor Metal Armored Removable Switchgear



KYN28A-24 indoor metal armored removable switchgear


Product structure and installation size

Product Structure Diagram


KYN28A-24 Indoor Metal Armored Removable Switchgear


Switchgear bottom plate installation dimension diagram


KYN28A-24 indoor metal armored removable switchgear


Product basic installation diagram


KYN28A-24 type indoor metal armored removable switchgear


Example of a one-time program combination


KYN28A-24 Indoor Metal Armored Removable Switchgear


Ordering Instructions

Users must provide the following information when ordering:

1. Main wiring scheme number and single-line system diagram, arrangement diagram and floor plan;

2. Secondary function diagram, terminal arrangement diagram, if there is no terminal arrangement diagram, it is arranged according to the manufacturer's terminal arrangement;

3. The model, specification and quantity of the electrical components of the switchgear;

4. Summary table of electrical equipment;

5. Two-column cabinet bus bridge and wall cabinet incoming bus bridge need to provide cross cabinet and height dimensions;

6. When the cabinet is used in special environmental conditions, it should be put forward when ordering;

7. The number of types is provided when other accessories are required or beyond.