How to connect two tubular busbars?

The key factors that determine the quality of tubular busbars are conductors, insulating materials and busbar connection technology.

1. About conductors.

Pure copper is the best conductor of metals other than pure silver, which is clearly reported in the professional literature. Any alloy conductor launched on the market in the name of high-tech is a product launched by the manufacturer in consideration of the user's financial capacity and production cost, and even in order to pursue high profits.

According to relevant research reports, copper-clad aluminum conductors have a very bad impact on re-furnace smelting after being scrapped, and cause incalculable harm to the recycling of metal materials. Some experts appealed: the use of copper-clad aluminum "does more harm than good"!

From the perspective of purified metal smelting, the use of such products should be restricted. It is believed that after such problems are gradually exposed, the state will adopt relevant legislation to prohibit or restrict the use of such products with serious social harm.

2. About insulating materials.

The use of polytetrafluoroethylene, known as the "king of plastics", its electrical and chemical properties are significantly better than other polymer insulating materials. What is especially valuable is that it is the highest class C heat resistance grade of its kind, with long-term use reaching -180 degrees + 250 degrees, and allows quenching and sudden heating or alternating hot and cold operation.

3. Connection technology.

Due to its own characteristics, the pipe bus bar must be processed in sections in the factory, transported to the site for on-site connection through the connecting parts, and the on-site insulation processing of the connecting parts. It can be said that the technical level of the pipe bus connection has a great impact on the service life and daily maintenance of the busbar. After leaving the factory, the tube bus bar is a qualified product that has been strictly inspected by industry standards one by one, and the level and process of on-site connection will really determine the performance of the bus bar after it is put into use.

Wuxi Dasheng Science and Technology patented technology "embedded female connector", using the same diameter connector with the female conductor for connection, strengthens the reliable connection at the same time, to ensure the smooth appearance of the overall female tube after the connection, such a technical scheme is conducive to the reliability of the connection part of the site insulation, the temperature rise of the connection part is consistent with the pipe body, and the distance between the phases is better guaranteed. This is quite different from the use of other connector technology processes.

Just like the principle of wooden barrels, no matter how good a barrel is, as long as there is a plank, the barrel is a defective product. It can be said that the advantages and disadvantages of connector technology are the "wooden board" that determines the quality of the tube busbar.

You can use the reducer link.

The scientific name of the aluminum wire in the middle of the tube mother should be called "damping line", and because the alternating current has a "skin effect", the damping wire inside the tube mother does not play a conductive role at all, it is only a stable and balanced role.

Tubular bus aluminum alloy tube bus is the leading product of Guangzhou Bailian Power Equipment, one of the key equipment (materials) in the power transmission and transformation system, and plays a vital role in the safe and reliable operation of the power transmission and transformation system and power equipment.

Abstract tubular busbar.

Aluminum alloy tube bus is one of the key equipment (materials) in the power transmission and transformation system, which plays a vital role in the safe and reliable operation of the power transmission and transformation system and power equipment.

First, the use of aluminum alloy tube bus: mainly used in China's power construction projects between the power grid transmission wire and the substation transformer between the conductor connection, the transmission line in the jumper, the power equipment in the connection conductor and the high-current DC ice melting device as the overcurrent conductor, is to replace the traditional rectangular, trough, rod bus and soft conductor of the new conductor, is one of the key equipment (materials) in the power transmission and transformation system, plays a vital role in the safe and reliable operation of the power transmission and transformation system and power equipment.

Second, the performance of aluminum alloy tube busbar: this series of products has unique material properties (LDRE rare earth aluminum alloy, 6Z63 heat-resistant aluminum alloy, etc.), structural form and processing technology, with 3 authorized utility model patents, 3 applications have passed the preliminary examination of invention patents, 1 application has been accepted utility model patents, is a new energy-saving bus conductive material, is the traditional steel core aluminum strand, trough, rectangular aluminum bus alternative products.

The main performance is embodied in:

1) The tubular conductor (busbar) adopts a series of advanced technologies such as domestic advanced hot-top casting seamless pipe, with smooth surface, high dimensional accuracy, high tensile strength, and is not easy to produce discharge and deformation;

2) The product adopts rare earth and heat-resistant aluminum alloy materials developed by the company (which has been declared for national invention patents), and has excellent processing, welding, electrical conductivity and heat resistance. The products have been identified by the science and technology department and reached the international advanced level (Huanggang Science and Technology Bureau Huang Ke Jian Zi 2009 No. 1);

3) Good convection heat dissipation conditions, low temperature rise, low loss, strong conductivity and large current carrying capacity (State Grid Wuhan High Voltage Research Institute "Test Report" 2008 Cable No. S13);

4) High heat resistance, which can improve the working temperature of the tube bus (the working temperature reaches 150 -200), the conductor has high mechanical strength at high temperature, and improve the safety and reliability of the power transmission and transformation system (Test Report No. 2008343, Materials Research and Testing Center of Wuhan University of Technology);

5) The installation area is small, and the combined pipe bus is 1 3 of the floor area of the soft wire

6) Anti-corrosion, not easy to ice, strong disaster resistance, long service life (the first application in the ice melting device in China, has been declared a national patent);

7) Easy to install, beautiful appearance, safe, stable and reliable operation, easy to overhaul and maintain. Aluminum alloy tube busbar.

The steel-core aluminum stranded wire in the middle of the tubular bus is set up to prevent breeze vibration, and is connected with the end caps at both ends of the tube bus; The pipe bus between the circuit breaker and the transformer you mentioned may be set up across the road, and the connection between the pipe bus and the circuit breaker and the transformer can be set up with a KLMG cross-road fitting.

The damping wire in the tube mother does not need to be connected with the circuit breaker terminal, and there are special fittings at both ends of the tube mother to fix the damping wire, you only need to consider the wire and fittings in the middle of the tube mother and the circuit breaker.

Tubular bus bars can be connected with rectangular bus transfer fittings, and the specific specifications should be decided according to the actual needs of lap busbars.

The expansion joint of the tube bus can be manufactured by the construction unit or customized separately.

Or tubular bus cross-circuit fittings to see how to connect buddies.

Tubular busbar. Differences with rectangular busbars.

1.The structure of the tubular bus is simple and clear, and it is more convenient to install and maintain later.

2.Compared with the rectangular busbar, the tube bus is a hollow conductor, so the heat dissipation effect will be better.

3.The tubular busbar is not disturbed by the environment and will not be affected by external dust and moisture.

4.The surface area of the tube bus bar is large, and the conductor surface and current density are evenly distributed, which is more suitable for circuits with large currents.

5.The insulating material of PTFE is used, which is not afraid of high temperature and has strong aging resistance.

6.It also has the characteristics of strong electrical insulation performance.

I'm not very familiar with this problem, because I'm not engaged in substation design. I asked about the main design of the substation, and he told me that the span between the insulators should be calculated for deflection, but they usually do not calculate, just according to the national standard or refer to the design value of others to take a conservative point of the value, the current design level is like this, there are few people who really understand the technology. The length of the support fittings does not need to be calculated, which voltage level is used for which voltage level of the fittings, if it is a suspension type, it is usually better to increase the pollution level than the corresponding line insulator.

I don't know what the length of the support fittings on one side means, where it appears, give a complete locale, let's learn it together.

The type relates to a 10kV insulated tubular type bus partial discharge detection system, and its technical characteristics are: comprising a capacitive sensor, an ultrasonic sensor, a synchronous voltage signal pick-up device, a filtering amplification device, a control host and a touch screen display; The two metal foil electrodes of described capacitive type sensor are respectively attached to the two sides of the insulated tubular type bus to be measured, and are connected with the differential circuit detection impedance to form a differential detection loop; The output end of described differential circuit detection impedance, ultrasonic sensor, synchronous voltage signal pick-up device is connected with the input end of capacitance filtering amplification device, ultrasonic filtering amplification device, voltage filtering amplification device respectively; The output ends of above-mentioned three filtering amplification devices are all connected with the control host, and the control host is connected with the touch screen display. The utility model integrates a plurality of sensors to be able to detect the partial discharge type and the degree of discharge of insulated tubular bus quickly, accurately, and is convenient to carry.

Including capacitive sensor, ultrasonic sensor, synchronous voltage signal pick-up device, capacitive filter amplification device, ultrasonic filter amplification device, voltage filter amplification device, control host and touch screen display; The two metal foil electrodes of described capacitive type sensor are respectively attached to the two sides of the insulated tubular type bus to be measured, and are connected with the differential circuit detection impedance to form a differential detection loop; The output end of described differential circuit detection impedance, ultrasonic sensor, synchronous voltage signal pick-up device is connected with the input end of capacitance filtering amplification device, ultrasonic filtering amplification device, voltage filtering amplification device respectively; The output end of described capacitance filter amplification device, ultrasonic filter amplification device, voltage filter amplification device is all connected with control host, and described control host is connected with touch screen display.

Insulating Materials 2015,48(4) Qiu Taihong et al.: Application of partial discharge detection technology in 10kV tubular bus fault detection 69

Application of PD Detection Technology in 10 kV Tubular Bus Fault Detection: Taihong Qiu, Junbo Wang, Guowei Li, Shenghong He, Yulong Huang, Shaohui Liu (Foshan Power Supply Bureau, Guangdong Power Grid Co., Ltd., Foshan, Guangdong, China.

The measurement method of partial discharge of a tubular bus should be from the inner section of this end of the bus duct.

The busbar in the distribution cabinet does not need to be calculated separately, and the busbar that has been included in the distribution cabinet needs to be calculated separately.

The tubular bus partial discharge measurement method is still relatively accurate.

1. The two ends of the damping line in all tubular buses should be fixed on the end covers of the two ends, otherwise due to the natural disturbance of the tubular bus after installation, the damping line will concentrate in the middle in long-term operation, increase the load of the middle section of the bus, and increase the disturbance degree, which is not conducive to the safe operation of the bus.