1、附录四 英文文献及译文 Analysis of the reasons for the low power factor of the factory power supply system, and to improve power factor and to take effective idle work compensation measure is discussed. To saved the electrical energy,raised enterpriseps economic efficiency has important effect。 Large and mediu
2、m-sized enterprises PeiDianJian with responsibility for the whole enterprise management and distribution of electricity. At present, most of the enterprise management mode PeiDianJian obsolete, low automatization, difficult to adapt to the requirements of the development of enterprises. In view of t
3、his situation, we have developed PeiDianJian monitoring and management system. This system in the computer as the core, real-time monitoring of electric parameters, PeiDianJian all the data processing, dynamic display of statements and output. This system can be used in the PeiDianJian enterprise te
4、chnical renewal and the transformation of enterprise to do well planned, save electricity, improve economic benefit has important significance. We use the mains by huge power supply system is provided, all the network supply circuit is only for each of the power supply system, network, a tiny branch
5、es output. Metal wires connected by good conductors of power supply circuit, each of its source power substation, and then from that power to client to substation and its level in scale, thousands of kilometers and hundreds of kilometers of kilometers. Bare wire in the air in the vertical distributi
6、on of atmospheric mountain while high and low, in accordance with the Qing, from dozens of rice to thousands of meters and hundreds of meters above all common. 2 kmIn such a large scope, the vertical distribution and wide for substation online, due to weather, no matter where or by direct discharge,
7、 clouds cloud in discharging, in the air and good conductors of bare wire easily inductive or direct lightning introduction to. This is the power system and power equipment to be struck by lightning external environment. Power supply system and electric defense methods of lightning Analysis of the p
8、ower supply system and electric easily be struck by lightning, can draw on electrical equipment, defense lightning damage, should be perfected in the power supply system, and avoid thunder lightning protection measures, the core problem is how to maximize effectively or truncate the high voltage and
9、 the thunder and lightning, strong flow under the frequency of more than 10 KHz seitching invasion. transformer segregation laws To effectively cut from the high voltage power and strong currents, currently use transformer isolation method. So-called isolation method, is based on transformer transfo
10、rmer equation: EM = 4144fNBMS Type of EM for transformer original (vice), unit V； potential edge F for power source) frequency, unit (speed, N the original (vice) side of coil, The intensity of magnetic core materials BM, unit Wb/M2, S for the core area, unit M2. This equation, powerful lightning in
11、vade the transformer, due to transformer voltage electric ray than the normal supply of high pressure many times, make incentive magnetic induction than the maximum allowed by magnetic core transformer core strength BM, thus the magnetic saturation, transformer - electricity failure, GaoLei voltage
12、transform temporarily cannot transfer to the transformer, a deputy side of transformer protection lightning channel, the deputy of electrical equipment load. While there are usually installed transformer power valve can be powerful lightning and the lightning flow into the earth, and in the safe, hi
13、gh voltage, current, power Flow, fuses will fuse off. Stop So, always packed transformer electrical equipment configuration of transformer, than by lightning bad probability is greatly reduced. Why in the fall after the power supply, sluice stop there will still be struck by lightning disasters. Thi
14、s happened because lightning, invading transformer connected by vice and load of electrical equipment based on low, still can exist, these induction lightning induction lightning electronics products will cause of lightning. This problem is often neglected, many lightning disasters, the event is not
15、 solved the problem. The successful development of lightning power, for we solve this problem. Lightning arrester power For truncated or stop high-pressure seitching in metal wires to load caused by lightning, electric 1890 invented the clearance of the way after the lightning series fuse, 1922 made
16、 us Westinghouse carbonized silicon arresters. To use the 1972 Japan dielectric properties research into fell seconds with no gaps (ZnO) service. Current power supply system is widely used in such power lightning. Zno arrester by zinc oxide thermistors, each thermistors according to need to have it
17、made in certain switching voltage (psa). When in the lower voltage arresters ends switching voltage (psa), high resistance thermistors present state, arrester doesnt work. When lightning arrester ends when, in the voltages above switching voltage (psa), thermistors, low resistance by breakdown, even
18、 close circuit state, in a very short time (50ns s, 10-9) arrester is high, the work of a lightning through introducing the earth grounding safety. When, after the lightning arrester stabilised, voltage on both ends of the lower voltage switching voltage (psa), thermistors and present state of high
19、value, lightning arrester stop working, electric conduction normal power. FenLiuXing avoid thunder FenLiuXing avoid thunder, is the core of wire cable in transmission series on two capacitor, input shunt capacitor in an inductance coil. So, when the capacitance and inductance coil capactance C L rea
20、sonable choice of inductance, make through two more than 10 frequency capacitor, much like KHz TV signal frequency speed to sign for dozens of hundreds of megabytes speed signals through the capacitance, and lightning frequency circuit reactance small majority in 100 KHz, when lightning through the
21、capacitance, will produce larger pressure drop. And through the situation, high capacitance signals through the inductance greater pressure drop when L, much lower frequency of lightning, through the low impedance, large discharge by lightning, XieRu grounding. Television antenna lightning current share this line shunt principle and method. Production of equipment, such as mechanical processing machine, with various kinds of crane, with induction motor, etc, these large and electric power load is
