KYN28-12 Metal-clad Removable AC Metal Enclosed Switch Equipment
KYN28-12 (Z) indoor drawer style metal-clad switchgear is a set of power distribution device of rated voltage 3 to 12KV three-phase AC 50Hz of single bus bar and single bus bar segmental system. It is applicable to power transmission of the power plant, power receiving and distribution of the electric system and the substation of the industrial enterprises to fulfill the aims of control, protection and inspection.
This switchgear can meet the requirements of GB3906, IEC298 and so on, which has the "five-prevention" functions of preventing the error operation of the circuit breaker, preventing the push-and -pull of the hand drawer on-load, preventing from switching the grounding switch with power on, preventing the power transmission of the grounding switch in grounding position and the power spacer to prevent error entry. This switchgear is truly a power distribution device with super performance, which can adopt VD4 vacuum circuit breaker from ABB Company or VS1 vacuum circuit breaker at home.
Ⅱ. Use condition
Environment temperature: -15℃ to +40℃
Relative humidity: daily average ≤95% monthly average≤90%
Height above sea level: ≤1000m
Earthquake magnitude ≤8
No fire, explosion danger, serious pollution, or chemical erosion occasion.
Ⅲ. Main characteristics
The structure of the cabinet is bolt by aluminum zinc alloy board after the process of CNC machine tool and multi bending technology;
All the operation can be done after the cabinet door is closed;
High protection degree, protect the intruder of sundries and pests;
Simple and effective "five-prevention" lock function, protect error operation;
Can adopt VS1 and CD4 vacuum circuit breaker;
Easy replacement of the circuit breaker and free exchange of the drawers;
The cabinet can be installed by the wall, maintenance in the front, which reduces the floor space;
Large space of the cable room can connect many cables;
The relay room and the cable room can respectively add a heater to avoid freezing or erosion.
Ⅳ. Major technical parameters Major technical parameters of vacuum switchgear
No. | Name | Unit | Data | |
1 | Rated Voltage | KV | 3,6,10 | |
2 | Rated Current | A | 630,1000,1250,1600, 2000,2500,3150 | |
3 | Rated Frequency | Hz | 50 | |
4 | Rated short-time tolerant voltage | kA | 20, 25, 31.5, 40 | |
5 | Rated peak tolerant voltage | kA | 50, 63, 80, 100 | |
6 | Rated power frequency tolerant voltage | Inter-polar /polar to ground | kV | 42/1min |
Inter-fracture | kV | 48/1min | ||
7 | Rated lightening shock tolerant voltage | Inter-polar /polar to ground | kV | 75 |
Inter-fracture | kV | 85 | ||
8 | Rated lasting time of short-circuit | s | 4 | |
9 | Protection degree | Shell IP4X, interval room IP2X | ||
Major parameters of vacuum breakers
No. | Name | Unit | Data | |
1 | Rated voltage | kV | 3, 6, 10 | |
2 | Rated frequency | Hz | 50 | |
3 | Rated current | A | 630, 1250,1600,2000,2500,3150 | |
4 | Rated open circuit current when short circuit | kA | 20,25,31.5,40 | |
5 | 4s hot stable current | kA | 20,25,31.5,40 | |
6 | Rated dynamic stable current(peak value) | kA | 50,63, 80,100 | |
7 | Rated power frequency tolerant voltage | Inter-polar /polar to ground | kV | 42/1min |
Inter-fracture | kV | 48/1min | ||
8 | Rated lightening shock tolerant voltage | Inter-polar /polar to ground | kV | 75 |
Inter-fracture | kV | 85 | ||
9 | Rated lasting time of short-circuit | s | 4 | |
Ⅴ. Instruction of the structure
The cabinet is composed of the fixed cabinet body and the drawable part (the drawers). The cabinet shell and the interval boards are all bolt with aluminum zinc alloy boards. The protection degree of the cabinet shell can reach up IP4X, and IP2X of each interval room.
The cabinet has the functions of overhead inlet and outlet, cable inlet and outlet and left-right contact. Arrange the scheme cabinets according to usage to compose a power distribution device which can fulfill the designed function.
The installation and the commission of the switchgear can be done in the front. The cabinet can stand by the wall to save the floor space and lower the investment.
1. The cabinet body
The body and the interval boards of the cabinet are bolt by aluminum zinc alloy board after the process of CNC machine tool and multi bending technology, so that the cabinets assembled can guarantee the unity of the structure and the dimension. The aluminum zinc alloy board has the functions of corrosion resistance and oxidation resistance, and has the higher mechanical robustness than the ordinary steel board. The cabinet is divided to drawer room, bus bar room, cable room and relay instrument room by the interval boards with each unit grounding separately. The doors of the cabinet are all handled with the technology process of electrostatic gunning to make the surfaces have the advantages of anti-impaction, corrosion resistance, and beauty and so on.
2. The drawer
The drawers can be classed to circuit breaker drawer, voltage transformer drawer, metering drawer, separation drawer and station used variety drawer according to different usage. The drawers with the same usage can exchange each other. The drawers have test/separating and working positions inside the cabinet, each position with an interlock unit to ensure the drawers can't move freely in the above two positions.
3. Circuit breaker drawer room
A special channel has been installed in the isolation room to provide the drawer to move. When the circuit breaker is moving between the test position and the working position, the separating valve automatically opens or closes to ensure that the operating staff can't get in touch with the charged body. The drawers can be operated in the condition that the cabinet door is closed. The position where the drawer is inside the cabinet can be seen through the monitoring window, and any of the labels on the drawer can also be seen. All these guarantee the safety of the operating and the maintenance staff.
4. Bus bar room
The main bus bar is lead from one cabinet to another cabinet and it is firmed by branch little bus bar and electrostatic contact box. It is fixed by bus bar bushing when it goes through the side wall of the neighbor cabinet.
5. Cable room
Adequate cable room not only can connect many cables, but also can install current transformer, grounding switch and lightning arrester and so no.
6. Instrument room
The internal plate and the panel of the relay room can install control and protection elements, the meter, the displaying instrument and the monitoring indicator and so on secondary elements.
7. Interlock unit
The cabinet has a reliable interlock unit in accordance with the "five-prevention" requirement, which actually guarantee the safety of the operating staff and the device:
a. An attention button and an alternation switch KK are installed on the room door to avoid the error switch on/off of the circuit breaker;
b. The circuit breaker can not move after switching on in working position to avoid the error pull or close of the separating contact;
c. The grounding switch can switch on only the drawer of the circuit breaker exits the cabinet and the drawer can not enter the cabinet at the same time (the grounding switch can match a voltage monitoring unit). The grounding switch can not switch on when the drawer is in the cabinet, thus fulfill the preventions of closing the grounding switch with power and closing the circuit breaker before the grounding switch is open;
d. The bottom door and the back door can not open after the circuit breaker entering the cabinet to avoid the error entry with power interval;
e. The drawer of the circuit breaker can switch off manually only without switching on when it actually is in test or working position and has no control voltage;
f. The secondary plug is locked and can not be pulled out when the drawer is in working position.
8. Grounding position
In the cable room, TMY40*4 grounding bus bar has been set independently. This bus bar can go through every neighbor cabinet and can get a good connection with the cabinet body to ensure the safety of the operating staff and the cabinet body.
9. Pressure releasing unit
Pressure releasing units have been set at the upside of the drawer room, bus bar room and the cable room. When the circuit breaker or the bus bar arises inner electric arc, with the appearance of the electric arc, the air pressure in the cabinet grows and the pressure releasing unit will automatically open to release the pressure and air when the pressure reaches up to a certain value to ensure the safety of the operation staff and the cabinet body.
Ⅵ. Structure diagrams and overall dimension (see the attached diagrams)
Ⅶ. The installation of the switchgear (see the attached diagrams)
1. Basis style
The construction of the basis of the switchgear shall conform to the relative specification of "technology specifications of electric power construction and inspection".
The installation basis of the switchgear needs to water the concrete twice. The first time to water the concrete is for the installation components of the switchgear that is for the angle steel, square steel or the installation basis of the channel steel. The second time is to water the additional layer of the concrete, usually 60mm in thickness. The height of the concrete shall be 1 to 3mm lower than the surface of the component when water the additional layer of the concrete.
See the attached diagrams for the basic structure frame.
The installation quality shall be ensured when install the basic structure frame. The technology standard of the installation of the structure frame is 1m2 with 1mm tolerance.
2. The installation of the switchgear
See the attached diagrams for the installation basis and installation dimension of the switchgear.
When the cabinet body is unistrand, the passage before the cabinet is 2.5m for the best and 3m when biserial.
Transport the switchgear to the certain place according to the need of the project and the indication of the diagram. If arrange a long line of cabinets (more than 10 sets), the arrangement work shall be started from the middle.
