Powerformer ppt presented by b.yedukondalachari
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Powerformer ppt presented by b.yedukondalachari from pnc&viet in electrical & electronics engineering department.
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The document discusses a new machine called a "Powerformer" that can generate high voltage electricity more efficiently than conventional power plants. A Powerformer is a generator that uses high voltage cables in its stator winding, allowing it to directly connect to high voltage grids without needing a step-up transformer. This improves efficiency and reduces costs compared to plants that require transformers. The first Powerformer installation was a 11 MVA, 45 kV machine connected to the grid in Sweden. Powerformers offer higher efficiency, lower maintenance costs, and better power transfer from generator to grid than conventional systems.
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A vacuum circuit breaker uses vacuum as an insulating medium to interrupt electric current. It consists of fixed contacts, moving contacts, and an arc shield mounted inside a vacuum chamber. When the contacts open, an arc is produced which is quickly extinguished as the metallic vapors and ions condense rapidly on the contact surfaces, restoring dielectric strength. Vacuum circuit breakers offer high insulation, can interrupt any fault current, produce no noise or gases, and are used for applications from 11kV to 36kV.
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This document provides an overview of circuit breakers, including their operating principles, components, and classifications. Circuit breakers are mechanical switching devices that open and close electrical circuits under normal and abnormal conditions. They contain fixed and moving contacts to carry current when closed. When a fault occurs, the contacts separate, creating an arc that must be extinguished quickly. Circuit breakers use various insulating fluids or methods to cool the arc and reduce its conduction in order to interrupt the current. Common types include oil, air, sulfur hexafluoride, and vacuum circuit breakers.
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Skin effect, proximity effect, ferranti effect, corona discharge
Here are the steps to solve this problem:
1. Given:
Conductor diameter (d) = 10.4 mm
Spacing between conductors (s) = 2.5 m
Air temperature (T) = 21°C = 294 K
Air pressure (P) = 73.6 cm of Hg = 9.6 kPa
Irregularity factor (K) = 0.85
Surface factor for local corona (K1) = 0.7
Surface factor for general corona (K2) = 0.8
2. Critical disruptive voltage (Vc) = 28√(sdP/K)
= 28√(10.4×10-3×2.5×
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Skin effect, proximity effect, ferranti effect, corona discharge
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fb:ballen Gazi
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IIT毕业证原版定制【微信：176555708】【伊利诺伊理工大学毕业证成绩单-学位证】【微信：176555708】（留信学历认证永久存档查询）采用学校原版纸张、特殊工艺完全按照原版一比一制作（包括：隐形水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠，文字图案浮雕，激光镭射，紫外荧光，温感，复印防伪）行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备，十五年致力于帮助留学生解决难题，业务范围有加拿大、英国、澳洲、韩国、美国、新加坡，新西兰等学历材料，包您满意。
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留信网认证的作用:
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4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
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我们所定的价格是非常合理的，而且我们现在做得单子大多数都是代理和回头客户介绍的所以一般现在有新的单子 我给客户的都是第一手的代理价格，因为我想坦诚对待大家 不想跟大家在价格方面浪费时间
对于老客户或者被老客户介绍过来的朋友，我们都会适当给一些优惠。
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Powerformer ppt presented by b.yedukondalachari
- 1. Pnc&viet
- 2. Power requirement is increasing day by day due to the maximum power utilization. In order to meet this demand a large power has to be generated in an efficient way. A new machine namely “Powerformer” can do this. The conventional plant generated voltage is limited to 30KV. This voltage is stepped up to a high voltage level in the order of 800KV with the help of power step-up transformers. The step-up transformer imposes great drawbacks on the power plant, starting from reduction in efficiency, high maintenance costs, and more space less availability.
- 3. During the last century, a number of attempts were made at developing a high-voltage generator that could be connected directly to the power grid, i.e. without going any step-up transformer. The powerformer has opened a new chapter in the generation and transmission of electrical energy.
- 4. Powerformer Concept Innovative Design The first Powerformer Installation Advantages of Powerformer
- 5. Powerformer is a new machine, It is a 3-phase AC generator with a rotor of conventional design. The difference compared with conventional generator lies in the stator windings. In Powerformer stator winding consists of high-voltage cables instead of today’s windings with a square cross- section. By using high-voltage cables as generator stator winding, it is possible to highly increase the generated voltage. The decisive difference between this design and present- day technology is that Powerformer allows direct connection to the high-voltage grid.
- 6. 1. Generator 2. Generator circuit breaker 3. Surge arrester 4. step-up transformer 5. Line circuit breaker
- 7. This design implies the omission of the generator circuit breaker, the high current bus bar and the step-up power transformer from the power plant, because Powerformer comprises the functions of both generator and step-up transformer as realized from above Figure As a consequence there is an increase up to 1.5% in total electric power efficiency compared with today’s best designs, without using superconductive materials.
- 8. Powerformer has been designed with several unique features that allow it to exceed the 30kV limit, including a winding consisting of power cables and an innovative stator design.
- 9. The winding consists of a power cable with solid insulation and two semiconducting layers, one surrounds the conductor and the other outside the insulation. The insulation material is cross-linked polyethylene High-voltage power cables are used in winding. These cables used to many advantages over conventional designs
- 12. The stator of Powerformer consists of a laminated core. These laminated core are built up from electrical sheet. The winding is located in the slots formed by the teeth, the cross section of the slots decreases . The winding turn requires less cable insulation the closer it is to the rotor. Each slot has circular bores at intervals, forming narrow waists between the winding layers, as shown in Figure below.
- 14. The world’s first high-voltage generator based on the new technology; a hydropower machine is rated at 11 MVA, 45 kV, and 600 rpm. The machine has already been tested in the factory and installed at the Porjus Hydropower Center on the Lule River in northern Sweden. The machine is directly connected to the 45 kV transmission power grids; its stator is shown in below Figure
- 16. 1.It generates Low voltage (<30kv) 1.It generates High voltage (>>30kV) 2. High current 2. Low current 3. Stator has Short teeth 3. Stator Long teeth 4. High weight 4. Less weight 5. Mount winding is used 5. Thread cable is used 6. Impregnating windings 6. Extrusion type winding is used 7. High temperature 7. Low temperature
- 17. higher efficiency low maintenance costs power transfer form generator to power grid without going via the step-up transformer better availability
- 18. ABB’s new high-voltage generator (Powerformer) has been studied the new concept provides the possibility to directly connect a rotating machine to the high-voltage power grid without going any step-up transformer. Powerformer is a high-voltage generator; the limitation in its rated voltage is set solely by the AC Power cable and the cable accessories (terminations and joints) used in its stator winding. This means that Powerformer of voltage ratings up to 400 kV can be realized, although has not been proved yet.