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Reactor is important electrical equipment in the power system from stray capacitive current compensation limit inrush current, short circuit current limiting, filtering, smoothing, starting, lightning, choke and so on. The structure type of reactor can be divided into hollow reactor, the reactor core and semi-core reactors. Compensation stray capacitive currents reactor main shunt reactors with Petersen coil. Role shunt reactor is to limit the power transmission system voltage rise of the phenomenon of voltage rise is due to the load capacitance effects long term, asymmetric short-circuit fault and sudden load rejection. Petersen coil is usually used in the distribution system, its role is to make a single relatively short-circuit current can not continue to burn, causing the arc is extinguished. Petersen coil usually has a tuning function can change its value based on the stray capacitance and inductance resonance degree of power system. Series reactors or reactor, said damping effect is to limit the inrush current. Series reactor and power capacitors in series, for limiting inrush current when the gate capacitor combination, usually choose six percent capacitor capacity. Limiting reactors are connected in series into the power system, used for the outlet end of the generator terminals or distribution system, from the short-circuit current limiting. In order to cooperate with other electrical equipment, which can not be less than the actual impedance rating. Filter reactor used in conjunction with a capacitor to form a resonant LC branch. Achieve resonance for a certain number of harmonics, power system to filter out harmful harmonics. Smoothing reactors in the DC system, from the DC current limit amplitude ripple effect. In the design of smoothing reactors should be noted that when the coil current is distributed by the resistance, the best use of differential equations to calculate the design. If you press the AC impedance coil design may cause overheating, and the impedance value may not be accurate. Start reactors for AC motor starting time, limit the motor starting current, protect the motor running. Lightning substation out of line coil is typically used to reduce the lightning invasion wave steepness and amplitude. Traps and applications similar to mine coil, the coil built with lightning arrester and co-ordination unit. For preventing electric power line carrier communications in particular, facilitate the communication carrier extracted for essential equipment Power Line Carrier. Outdoor hollow dry-type reactor is the 1980s the emergence of a new generation of reactor product, shown in Figure 1.1. It is the use of epoxy winding wrapping technique is completely sealed, wire bonded to each other greatly increases the mechanical strength of the winding. While taking advantage of new weathering material encapsulated spit on the surface, making products to meet run under harsh conditions outdoors. Inter stay encapsulated by the formation of the airway between the encapsulation and the enclosure windings are connected in parallel in order to meet the multi-use capacity and cooling requirements. In order to meet the needs of each parallel branch current rational allocation, fractional-turn to reduce circulation problems between the branches. To be able to form fraction turn, uses the spider as a qualifying winding connector. Star frame winding up and down by pulling the yarn fixed way, after curing of the product as a whole. Reactors of this structure and the traditional way of reactors can be directly compared to having used outdoors, inductance is linear, low noise, explosion-proof, easy maintenance features, so it is possible for some of this product are gradually replaced by other forms of Reactor. Due to limited winding structure, outdoor air-core dry-type reactors are generally not suitable inductance (> 700mH) greater or smaller inductance (<0.08mH) but higher current situation, otherwise it will cause too bulky or branched circuit current is extremely uneven. In both of these extreme conditions, the need for appropriate changes in the form of a coil winding. In addition, hollow reactor is typically the largest area, the most serious of external magnetic flux leakage, which is the main drawback of this type of reactor. Dry Core Reactor is mainly composed of the core and coil, shown in Figure 1.2. Dry Core Reactor mainly composed of iron core coil. Core can be divided into two core columns and yoke section, core column is usually composed by a discus with an air gap. Set coil and core columns, fixed by the end of the pad. Core column by the upper and lower yoke clamp screw fixing into a whole. For three-phase reactors often use three hearts column structure, but for the next three-phase unbalanced operating conditions, requires the use of suspicious column structure, or likely to cause magnetic saturation of the core issues. Dry Core Reactor coils usually pouring, bag and dipping way around. Because of high permeability ferromagnetic media, and its magnetization curve is not linear, it is used in the core of the reactor core must be gapped. Gapped core, its reluctance depends on the size of the air gap. Since the magnetic characteristics of the air gap is substantially linear, so that the core of the reactor depends on the self-inductance of coil turns and the coil and the core size of the air gap. Because of the dry core reactor is a magnetic energy stored in the core major gap among the core magnetic circuit is equivalent to a short circuit, only the equivalent of the total length of the hollow coil gap. Therefore less Core Reactor coil turns, so that its smaller size. Small, small inevitable cooling area, so a smaller reactor core loss