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Selection standard of high voltage cabinet copper bar

 

Selection criteria for high-voltage cabinet copper bars Center cabinet KYN28 PT cabinet

Formula in GB3906 [Appendix D]: S=I/a√(t△θ)

In the formula: I-rated short-time withstand current; a-material coefficient, copper is 13, and aluminum is 8.5; t-rated short-circuit duration; Δθ-temperature rise (K), generally 180K for bare conductors, For 4S duration take 215K.

then:

The minimum cross-sectional area of the copper busbar of 25KA/4S system S=(25000/13)*√4/215=260 mm2 60*5 is enough.

31.5KA/4S system copper busbar minimum cross-sectional area S=(31500/13)*√4/215=330 mm2

40KA/4S system copper busbar minimum cross-sectional area S=(40000/13)*√4/215=420 mm2

63KA/4S system copper busbar minimum cross-sectional area S=(63000/13)*√4/215=660 mm2

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80KA/4S system copper busbar minimum cross-sectional area S=(80000/13)*√4/215=840 mm2

The ground bus is considered according to 86.7% of the rated short-time withstand current of the system:

25KA/4S system grounding copper busbar minimum cross-sectional area S=260*86.7%=225mm2

31.5KA/4S system grounding copper busbar minimum cross-sectional area S=330*86.7%=287mm2

40KA/4S system grounding copper busbar minimum cross-sectional area S=420*86.7%=370mm2

63KA/4S system grounding copper busbar minimum cross-sectional area S=660*86.7%=580mm2

80KA/4S system grounding copper busbar minimum cross-sectional area S=840*86.7%=730mm2

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Selection of main bus and branch bus

 

1. Selection of main bus:

For the selection of the main busbar of the high-voltage switchgear, the specification should not be less than 50*5. As shown in the drawing, in principle, the cross-sectional size is based on the drawing, but the specifications are in accordance with this specification cnc busbar machine manufacturers. If the design drawing is obviously unreasonable, you should contact the customer in writing. The rated current of the incoming switchgear is the minimum limit for selecting the size of the busbar, and it should also be considered that the busbar should withstand the breaking current and dynamic thermal stability current of the main circuit. The specifications of the contact bus are the same as the main bus, according to the above characteristics. The 35kV main busbar is appropriately enlarged by one stage according to the cabinet.

2. Selection of support bus

For the selection of the branch busbar of the high-voltage switchgear, the specifications are in accordance with this specification. For the copper bar cutoff in the inlet cabinet, the rated primary current of the current transformer equipped with the inlet switch is used as the basis for selection, and the main busbar or the switch should not be referred to Rated current value, the copper block cut-off flow in the outlet cabinet should be based on the rated primary current of the current transformer equipped with the outlet switch, and the manufacturability of the busbar overlap structure in the high-voltage cabinet, such as the primary component

To meet the requirements of full overlap of the structure. The connection row of lightning arrester, voltage transformer and sensor is designed according to 30*3 without affecting the dynamic thermal stability. When there are multiple main buses, the thickness of the branch bus should be considered as uniform as possible.

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Workshop production process

1. The appearance and performance requirements of the product are very strict. In the production process, if there is a defect in the appearance of the product, it is impossible to pass. The performance of the product is 100% pass.

2. There are strict and uniform regulations on the placement of labels on the outside of the product.

3. If there is a problem with the product, it can be traced back. If there is a problem in that link, you can directly find the problem from that part and improve the product consistency.

4. Every product starts to be produced according to the prescribed technological process, and cannot be made according to individual ideas.

5. Each process has one or two quality inspectors present during the production process, and samples the products at any time.

Company workshop production process

1. The product is cut according to the design of the drawing starting from the raw material of the large piece.

2. After cutting, engrave the product according to the size with a carving machine.

3. After finishing carving, remove the tin plating, and the thickness of the tin plating measured with a thickness gauge is 0.005-0.015mm.

4. After polishing and electroplating, press and rive the copper match to the product.

5. After assembling the product, start assembling and stack the product and abrasive tools.

6. After assembling the grinding tool and the product, start hot pressing.

7. After an hour and a half of hot pressing, take it out for disassembly and take out the busbar inside. After the insulation layer and the copper plate are hot pressed, the thickness of the insulation layer is 0.15-0.20mm. This can generally be done according to customer requirements.

8. Each product must go through a detailed inspection by the quality inspector after hot pressing to check whether there are scratches on it, whether it is pressed or not in place copper pipe bender. After the inspection, the product is qualified before it can be shipped. One flaw is not allowed to leave the factory.

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Product testing

 

  Composite busbars are, according to their definition, high-efficiency solutions for connecting components or submodules of converters or drives. It distributes power from one component to another component or from the input side to the output side of the high-power module. The company provides reliable solutions for the connection between busbars and busbars, and between busbars and components.

    The company can also provide assistance to the engineers of the client company in choosing the correct connection technology, taking into account different parameters, such as current volume, flexibility, etc. By making full use of the company's actual knowledge and production capabilities, you can ensure that you get a reliable, long-lived, and optimal electrical matching solution.

The main main advantages of the various connection technologies provided according to customer requirements:

1. Large current

2. Reduce leakage inductance

3. Minimum contact resistance

4. Minimal power loss

5. Easy to install and replace

6. Long life

7. Corrosion resistance

8. Space saving

material	Continuous use temperature	Compressive strength	Dielectric constant	Flammability rating	Thermal conductivity	Basic performance	价格
Epoxy resin	155	15.7KV/mm	3.5-4.0	94 V-0	0.18	Stable chemical properties, low hygroscopicity, flame retardant	低
PI (Polyimide)	260	13.8KVAC(3mil)	3.70	94-0	0.094	Excellent heat resistance, good electrical properties, flame retardant	cutting bending machine.0000pt solid #000000;background:#66FFFF;"> 高
PET	150	10.0KVAC(3mil)	3.30	94 V-0	0.128	Good electrical properties and chemical resistance;	低
NOMEX	220	1.6KVAC(3mil)	1.60	94 V-0	0.143	Excellent fire resistance, heat resistance, good chemical resistance, flame retardant	高
Polyvinyl fluoride (PVF)	260	4.2KVAC(2mil)	11.0	94 V-0	0.12	Excellent mechanical properties Stable chemical properties, not easy to melt	高
NMN	155	14KV/mm	2.4	94V-1	0.136	Good electrical properties, good mechanical properties, good resistance to breakdown and overload, flame retardant	中
DMD	155	11 KV/mm	4.3	94V-1	0.129	High heat resistance, excellent electrical properties,机械性能好	低
NHN	155	8 KV/mm	4.8	94V-0	0.141	Excellent electrical properties, good resistance to breakdown and overload, flame retardant	高

 

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Precautions for processing and installation of cutting busbars

 

Apply mechanical methods and prohibit the use of gas welding.

9.2 The busbar is being adjusted. When leveling, do not directly strike with a hammer.

9.3 During the processing of busbars, the production equipment used should be used in accordance with the equipment operation regulations to ensure personal

   And equipment security.

9.4 During the tin plating process, pay attention to the safe use of acids and bases.

9.5 The fixing between the busbar support splint and the support insulator should be flat and firm, and should not make the supported

The busbar is subjected to mechanical stress.

9 bus bar machine.6 The busbar fixing device shall have no obvious edges and corners to prevent the discharge of the tip.

9.7 It is forbidden to walk in the arc area of the automatic switch.

10 Inspection regulations

10.1 According to the power distribution system diagram and manufacturing specifications, check the main circuit plan. Inter-cabinet communication. The incoming and outgoing lines should meet the requirements.

Cracks are not allowed at the bends, the height of the wrinkles at the side bends cannot exceed 1mm, and the surface of the bus bar should not have significant defects such as hammer marks and pits.

10.3 The overlapping surface of the busbar shall be flat and smooth, and naturally match.

10.4 The busbar connection is tight and reliable, with anti-loosening measures, and the busbar installation and arrangement should be clearly arranged.

10.5 The busbar shall maintain its creepage distance and clearance under normal conditions of use.

10.6 When the functional unit is in the separated position, the gap between the exposed live part of its main circuit connector and the vertical bus bar or static contact is not less than 25mm.

10.7 The processing and installation of busbars comply with the requirements of the process code.

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Introduction to Compound Busbar

 

The composite busbar is also called the busbar, the electronic busbar, and the laminated busbar. The English name is Laminated Busbar. It is a multi-layer composite structure connected circuit composed of one or more layers of conductive materials and insulating materials. The connection row can be regarded as the expressway of the power distribution system copper busbar bending machine. Compared with traditional, bulky, time-consuming and cumbersome wiring methods, the use of composite busbars can provide a modern, easy to design, fast installation and clear structure distribution system.

Company Busbar Product Department

reliable

  ● Low inductance

  ●Effective control of partial discharge

  ●Enhanced electromagnetic interference

Low installation cost

  ● Error-free connection

  ●Compact design saves space

  ●Durable

In response to customer needs

  ●Provide engineering support as soon as possible

  ●Various connection options

  ● Match the shape of customer equipment

  ●The most economical alternative to laminated busbars, easy to install and convenient for logistics

  ● Cutting-edge products for high-power occasions

 

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Busbar installation process

 

Before installing the aluminum busbar, you can use a copper wire brush to remove the oxide layer on the surface of the busbar contact. It can be installed directly (immediately). For example, if the oxide-removed aluminum busbar is placed for a period of time, the above work must be performed first. Can be installed afterwards.

8.2 When copper and aluminum are overlapped, the copper bar must be tinned and ensure that the aluminum bar connection cannot be deformed after being pressed

8.3 Fasteners for connection (bolts, spring washers, flat washers, nuts, etc.) shall comply with national standards, and are refined or semi-finished products of galvanized yellow.

8.4 The penetration direction of the bolts used for connection should be from bottom to top, from back to front, from left to right. In the remaining cases, the nut is placed on the maintenance side. The diameter of the bolt is selected according to the size of 1 to 1.5 mm smaller than the connection hole. The length is suitable for exposing the nut 2~3 buckle after flattening the spring washer.It is never allowed to exceed the diameter of the bolt itself or be retracted into the nut.There must be corresponding flat washers on both sides of the bolt, and the smooth surface of the flat washer faces outward. The washers of adjacent bolts should have a clear distance of more than 3 mm to prevent the heating of the magnetic circuit, and the corresponding spring pads should be added on the nut side.

8.5 The connection between the busbars should be tight. The contact is good. The configuration is neat and beautiful. The contact surface is checked with a 0.05×10 mm feeler gauge to meet the following requirements: the busbar width is more than 80mm, and it cannot be inserted into 6mm; the width is 50mm or less, and it should not be plugged Into 4mm.

8.6 Painting: (Not adopted by our company)

8.6.1 The surface of the busbar should be painted and the paint should be even. The adhesion is firm, and there should be no phenomena such as layering, wrinkling, sagging, etc., in the low-voltage cabinet. For the busbar with more connection holes in the box, the paint is not Beautiful and difficult to operate can be tinned as a whole.

8.6.2 The two sides of the joint are not painted at a distance of 10mm. The starting and ending points of the three-phase busbars should be kept neat, and the allowable error between the three phases is 2.5mm.

8.7 Fixed

8.7.1 The distance between the two fixed points of the horizontal row and the vertical row is less than or equal to 1m, and more than 1m must be added with fixed points.

8 multifunction cnc busbar machine processing center.7.2 At least two fixing points are required to fix the horizontal row and the vertical row, and it is strictly prohibited to fix with one fixing point.

8.7.3 The fixing of copper bars is made of insulators, epoxy boards and other insulating materials.