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Power capacitor principle, structure and specifications

by:SMiLer     2021-02-11
Principle of power capacitor power capacitor structure the basic structure includes: capacitance component, impregnant, fasteners, fuses, shell and tube. Diagram is shown in figure 1. Figure 1 compensation capacitor structure known as the low voltage capacitor under rated voltage 1 kv, is above 1 kv high-voltage capacitors, three triangles, sensors are made, the internal components in parallel, each element in parallel has a separate fuse; High voltage capacitor are generally made of single-phase, internal components in parallel. Shell with sealing plates welded together, core is composed of series parallel capacitance component, using aluminum foil as the electrode capacitance component, using insulation composite film. Underwear of capacitor insulating oil ( Mineral oil or dodecyl benzene, etc. ) As dipping medium. ( 1) Capacitive element with a certain thickness and layers of solid medium and rolled aluminium foil electrode. Several capacitance component in parallel and series, capacitor core. In high voltage capacitor voltage is 10 kv and below, each capacitor element string have a fuse, internal short circuit protection as a capacitor. When a component breakdown, other good components, namely the discharge, fast fuse in the millisecond time fuse, removal of fault component, so that the capacitor can continue to work normally. The structure of the capacitance component is shown in figure 2. Figure 2 capacitance element structure ( 2) Impregnant capacitor core generally put in impregnant, in order to improve the cell capacity of medium pressure strength, improve the conditions of partial discharge characteristic and heat dissipation. Impregnant in with mineral oil, chlorinated biphenyl, SF6 gas, etc. ( 3) Shell and tube shell is made of thin steel plate welded together commonly, surface, flame retardant paint cover shell welding wire casing, box side wall welding lifting climbing, grounding bolt, etc. Large capacity, collective of capacitor also is equipped with oil box cover pillow or metal expander and pressure relief valve, side walls is equipped with flake radiator, pressure type temperature control device, etc. Terminal from the qualification in the porcelain sleeve. Power capacitor specifications in old projects and the capacitance compensation ark at the end of the life, the need to change the electric power capacitor, but a lot of suppliers will be asked to type and specification, then a lot of customers, with a clueless look on his face, the capacitor type and specification? Actually asked capacitor type and specification is mainly in order to match the customer transformer or power load, in order to make sure the capacitor in the use of the security and stability, in the process of in short, is to give your device to provide appropriate components, to ensure the normal operation of equipment. Common electric power capacitor model capacitor model might fill medium, voltage, such as harmonic varies, we CKKB440 - now 20 - 3 - G as an example, detailed introduction of power capacitor model. The first set of number 440 for electric power capacitor voltage grade, said electric power capacitor voltage of 440 v. The second group number 20 for the electric power capacitor value, said electric power capacitor capacity of 20 kvar. The third group number 3 for electric power capacitor phase number, said electric power capacitor for single-phase electric capacity. Along with the development of automated production equipment, electric power capacitor using harmonic problems in the environment is more to highlight, part of the electric power capacitor manufacturer according to this trend, launched a series of resistance to different degree harmonic power capacitor, so part of the electric power capacitor model will have to apply harmonic levels of note, for example: is suitable for the harmonic current distortion rate THDI 50% or less of the working environment. Common electric power capacitor power capacitor specifications specifications will have certain difference, because of the type we still CKKB440 - 20 - 3 - G as an example, detailed introduction of electric power capacitor specification: rated voltage ( 联合国) : 440 v rated capacity ( Qn) 20 kvar: according to capacitor model and the rated voltage and rated capacity, by querying CKKB electrical capacitance parameter table, is rated current ( 在) : 26. 2 a nominal capacitance ( Cn) : 329. Overall dimensions (0 u F capacitor φD * H) : 116 * 250 according to the national standard requirement, in order to ensure the normal operation of electric power capacitor, there needs to be 1. 1 times the overvoltage and 1. 43 times over current capacity, the electric power capacitor allows overvoltage for: * 1 rated voltage. 1 = 440 * 1. 1 = 484 v power capacitor to allow over current to rated current * 1. 43 = 26. 2 * 1. 43 = 37. 466 a part of the electric power capacitor manufacturer consider the customers to use environment is complex, designed for power capacitors 1. Three times the overvoltage ability, namely the electric power capacitor allows overvoltage for: * 1 rated voltage. 3 = 440 * 1. 3 = 572 v
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