Substation Electrical Scheme Flexible Ac Low Voltage Distribution Cabinet
Summary
The AC low-voltage distribution cabinet is suitable for the power distribution system of 50Hz, rated working voltage of 380V, and 5000A of power plant, substation, industrial and mining enterprises, which is used as the power conversion, distribution and control of power, lighting and distribution equipment.
The product has the characteristics of high separation ability, good dynamic and thermal stability, flexible electrical scheme, convenient combination, strong practicability, novel structure and high protection level.It can be used as a replacement set of low voltage switchgear.
AC low voltage distribution and comply with IEC439 Low voltage Switchgear and Control Equipment, GB7251 Low voltage Switchgear and other standards.
Model Meaning
| G |
G |
D |
|
|
|
|
AC low voltage
power switch box
|
Fixed installation
and fixed wiring
of electrical
elements
|
Power
cabinet
|
Design
serial
number
|
1 Break ability
was 15kA
|
Auxiliary circuit
scheme code
name
|
Main circuit
scheme
code name
|
| |
|
|
|
2-breaking capacity
was 30kA
|
|
|
| |
|
|
|
3-breaking ability
was 50kA
|
|
|
External Shape And Installation Size
| Product Code |
A |
B |
C |
D |
| 06 |
600 |
600 |
450 |
556 |
| 06A |
600 |
800 |
450 |
756 |
| 008 |
800 |
600 |
650 |
556 |
| 08A |
800 |
800 |
650 |
756 |
| 10 |
1000 |
600 |
850 |
556 |
| 10A |
1000 |
800 |
850 |
756 |
| 12 |
1200 |
600 |
1050 |
556 |
| 12A |
1200 |
800 |
1050 |
756 |
Use Environmenal Conditions
- The ambient air temperature is not higher than + 40℃ and no less than-5℃.The average temperature within 24h shall not be higher than + 35℃.
- Household installation and use, the site of use shall not exceed 2000m.
- The relative humidity of the ambient air does not exceed 50% at higher temperatures of + 40℃, allowing for greater relative humidity at lower temperatures.(For example, 90% at + 20℃) should take into account the impact of accidental condensation due to temperature changes.
- The inclination of the equipment to the vertical surface is not more than 5%.
- The equipment shall be installed in places without severe vibration and shock and not sufficient to cause corrosion of the electrical elements.
- Consultation with the manufacturer when users have special requirements.
Behaviour Of Electricity
| Basic Electrical Parameters |
| model |
rated voltage (V) |
rated current (A) |
Rated short-circuit open off current (kA) |
Rated short-time tolerance current (1S) (kA) |
Rated peak tolerance current (kA) |
| 1 |
380 |
A 1000 |
15 |
15 |
30 |
| 1 |
380 |
B 600(630) |
15 |
15 |
30 |
| 1 |
380 |
C 400 |
15 |
15 |
30 |
| 2 |
380 |
A 1500(1600) |
30 |
30 |
63 |
| 2 |
380 |
B 1000 |
30 |
30 |
63 |
| 2 |
380 |
C 600 |
30 |
30 |
63 |
| 3 |
380 |
A 3200 |
50 |
50 |
105 |
| 3 |
380 |
B 2500 |
50 |
50 |
105 |
| 3 |
380 |
C 2000 |
50 |
50 |
105 |
Main Circuit Scheme
The main circuit has designed 129 schemes, with a total of 298 specifications (not including the derived schemes and specifications of the auxiliary circuit function changes and control voltage changes).Among them, there are: type 1,49 schemes and 123 specifications,type 253 schemes 107 specifications Type 3 type 27 schemes 68 specifications.
The main circuit scheme is selected from the majority of design and use departments, and increases the scheme needed by the power plant.Rrated current is increased to 3200A suitable for distribution transformers of 2000kVA and below.In addition, the GGJ1-GGJ2 capacitance compensation cabinet is designed to meet the needs of reactive power compensation, and its main circuit has 4 schemes, with a total of 12 specifications.
◆ Auxiliary Circuit Scheme
The design of the auxiliary circuit is divided into two parts: the power supply scheme and the power plant scheme. There is sufficient room for the secondary elements to be installed in the cabinet.
◆ Electrical Element Selection
◇ Excellent electrical components that can be mass produced in China, such as ME, DW15, DW17, DW45, C M, CM1, NM1, etc. At the same time, some of the available old products such as DZ20 are retained under the premise of full consideration of feasibility.Do not choose the products with the survival of the sea.
◇ The special element designed by the HD13BX and HS13BX type rotary operation knife switch to meet the needs of the special structure of the cabinet, which changes the operation mode of the mechanism and retains the advantages of the old product, and is a practical and new electrical element.
◇ If the design department according to the needs of users, choose better performance, better technology of new electrical components, because the cabinet has good installation flexibility, generally will not update the manufacturing and installation of electrical components difficulties.
◇ In order to further improve the dynamic stability ability of the main circuit, the special ZMJ combined bus clip and insulation support parts are equipped.The bus clip is thermoformed by high strength, high lease combustion PP0 alloy material, high insulation strength, good off performance, special structure, just adjust the building block can be conveniently combined into a single bus bar or double bus clip insulation support sleeve mold pressure structure, low cost, high strength, solve the defect of insufficient climbing distance of old products.
Structure Profile
◆ The cabinet of the AC low-voltage distribution cabinet adopts the general cabinet type, and the frame is partially welded with 8MF cold bent steel. The frame parts and special supporting parts are supplied by the designated steel production factory to ensure the accuracy and quality of the cabinet.
Passenger parts of the general cabinet are designed according to the module principle and have 20-mode mounting holes.High general purpose coefficient, can enable the factory to achieve pre-production.Shorten the current manufacturing demand, but also improve the work efficiency.
◆ The design gives full consideration to the heat dissipation problem in the cabinet operation.There are different numbers of heat sink holes at the upper and lower ends of the box. When the electrical elements in the cabinet get heated, the heat rises and is discharged through the upper end slot hole. The cold air is constantly supplemented into the tank by the lower end slot hole, so that the sealed cabinet from the bottom to top into a natural wind channel to achieve the purpose of heat dissipation.
◆ According to the requirements of modern industrial product modeling design, using the method of gold division ratio to design the cabinet outside the body type and the division size of each part, to make the whole cabinet beautiful and generous, with a new face.
◆ The door rotary shaft movement is connected to the structure compared with the chain.Easy to install the standard cylinder.At the folding edge of the door, the travel strip between the closing time and the frame has a certain compression trip, which can prevent the direct collision between the door and the cabinet, and also improves the protection level of the door.
◆ The instrument door equipped with electrical elements is connected with multiple soft copper wire and the frame, and the installation parts in the cabinet are connected with roller screws. The whole cabinet constitutes a complete grounding protection circuit.
◆ The surface of the cabinet adopts spray plastic, strong adhesion, good texture, the whole cabinet two sublight color, avoiding the glare effect, and creating a more comfortable visual environment for the personnel on duty.
◆ The top cover of the cabinet can be removed when needed to facilitate the assembly and adjustment of the main bus on the site. The four corners of the cabinet top are equipped with hanging rings for lifting and loading.
◆ The protection level of the cabinet is IP30, and the user can also choose between IP20 and I P 40 according to the requirements of the service environment.See Figure 1 and Figure 2 for the schematic diagram of the exterior type and installation dimensions.
Installation And Use
After the product arrives at the receiving place, it should first check whether the packaging is intact and not damaged, timely inform the relevant departments to find out the reason, and for the products that are not installed immediately.It shall be placed in the appropriate place according to the normal conditions of use.
◆ Product Installation
The installation of the product shall be carried out according to the installation diagram (see attached Figure 2). The foundation groove steel and bolts shall be provided by the user. The main bus installation shall be smooth, treated, coated with neutral Vaseline or other measures, and then bolt tightened.
◆ After The Product Is Installed, The Inspection And Test Of The Following Items Shall Be Carried Out Before Being Put Into Operation.
◇ Check whether the cabinet decent paint has fallen off, whether the cabinet is dry and clean.
◇ Whether the operating mechanism of the electrical elements is flexible, it should not be stuck or have excessive operating force.
◇ Whether the disconnection of main electrical components is reliable and accurate, and whether the disconnection of auxiliary connections is reliable and accurate.
◇ Whether the change ratio and polarity of the instrument indicator and the transformer are correct.
◇ Whether the bus is well connected, whether the insulation support, fittings and accessories are firmly installed and reliable.
◇ Whether the auxiliary connection meets the requirements, whether the melting core specification of the fuse is correct, whether the fixed value of the relay meets the design requirements, and whether the action is accurate.
◇ Whether the connection of the circuit meets the requirements of the electrical schematic diagram.
◇ The protection circuit system meets the requirements.
◇ The insulation resistance measured with a 500 V MR gauge shall not be less than 10 MR.
◆Use Precautions
◇ This product is not wall installation, single face (front) operation, double-sided door maintenance low voltage distribution cabinet.The maintenance channel and cabinet door of the product must be assessed by the qualified professional personnel to enter or open for operation, inspection and maintenance.
◇ The air circuit breaker, after multiple closing and separation, will make the main contact locally burn and produce carbon substances, and increase the contact electric sun. The air circuit breaker should be maintained and repaired regularly according to its operating instructions.
◇ The isolation switch shall not be closed with load.
Factory Data And Accessories
The manufacturer shall provide the following documents and accessories when supply
◆ Dispatching list
◆ Product qualification certificate and factory test report
◆ Operating instruction
◆ Electrical drawings
◆ Instructions of main components
◆ Cabinet door key, operating handle and spare parts specified in the contract sheet.
Ordering Instruction
The user shall provide at the order
◆ Main circuit distribution system diagram and layout diagram, rated working voltage, rated working current, fixed current of the protection device, and necessary technical parameters.
◆ Mark the incoming and outgoing line cable specifications.
◆ Model, specification and quantity of the main electrical components in the switchgear.
◆ If the bus bridge or bus groove is required between the switch cabinet or into the incoming cabinet, the specific required data such as span and ground height shall be indicated.
◆ Switswitchcabinet shall be specified in detail when used under special environmental conditions.
◆ Switch cabinet surface color and other specific requirements.
