外文文献翻译
（含：英文原文及中文译文)
译文字数：3700多字
文献出处： J Ehnberg. Power of Community Distribution to Design［J] Value Engineering, 2016， 2（3):14—21
英文原文
Power of Community Distribution to Design
J Ehnberg
ABSTRACT
The basic function of the electric power system is to transport the electric power towards customers. The l0kV electric distribution net is a key point that connects the power supply wit
h the electricity using on the industry, business and daily—life。 For the electric power， allcostumers expect to pay the lowest price for the highest reliability, but don’t consider that it's self—contradictory in the co—existence of economy and reliable.To improve the reliability of the power supply network, we must increase the investment cost of the network construction But, if the cost that improve the reliability of the network construction， but the investment on this kind of construction would be worthless if the reducing loss is on the power-off is less than the increasing investment on improving the reliability .Thus we find out a balance point to make the most economic， between the investment and the loss by calculating the investment on power net and the loss brought from power-off.
KEYWORDS: power supply and distribution, power distribution reliability ， reactive compensation, load distribution
In general， major changes to the building include: high voltage and low voltage distribution systems, transformers, and backup power systems。 Power systems include power distribution and control， indoor and outdoor lighting systems include all types of lig
reactive翻译hting， and lightning protection systems include intrusion protection， lightning sensors, grounding, equipotential bonding， and local equipotential bonding. Auxiliary equipotential bonding. In just 20 years, the system has undergone enormous changes in the face of technology and products. Many design ideas have also changed dramatically。 Switchgear， such as the first circuit-breaker oil circuit breaker in a high-voltage system, and the subsequent development of an oil circuit breaker, are not only large in size but generally contain oil。 Due to the large size of the switchgear， we must also establish a separate equipment room that occupies a large amount of floor area。 Vacuum circuit breakers and sulfur hexafluoride circuit breakers are not only small in size, but also have a large short—circuit capacity. The size of the housing is much larger than that of the original cabinets, and the circuit breakers do not have any oil and the fire performance is greatly improved. And circuit breakers and other low-voltage devices are in one room， which saves space and is easy to manage。 In the past, large-capacity low-voltage circuit breakers gradually increased the capacity of the short—circuit current, gradually reduced the scale, and became more stable, making the system safer and more reliable， which fac
ilitated the design. Towards the development of intelligent low—voltage circuit breakers， various parameters of the circuit breaker can be controlled by the bus industry and the signals are transmitted directly to the computer.
The appearance of dry—type transformers has brought great convenience to the electrical design of buildings because there is no possibility of leakage of transformer oil and fire so that it can be easily installed in the building itself and even directly into the load center。 It also eliminates the transformer’s demand for oil and can use dry-type transformers when building large-capacity equipment。 Four Taiwanese 2500kVA dry-type transformers have been used in actual engineering design.
In terms of using emergency generators, it is much more advanced than in the past in terms of performance and size。 In addition to using diesel generators; emergency lighting uses EPS standby power; devices that interrupt power within a millisecond can use UPS.
The control of electrical equipment varies from the control of a single component to the control of relays. In addition to the smaller size of the various components for better perfor
mance, the specification of the control box is also reduced。 Because digital technology is more used in control to achieve the best control status to control the equipment。 Further improve the effect of energy conservation。
The revolution of electric power system has brought a new big round construction， which is pushing the greater revolution of electric power technique along with the application of new technique and advanced equipment. Especially, the combination of the information technique and electric power technique, to great ex- tent, has improved reliability on electric quality and electric supply。 The technical development decreases the cost on electric construction and drives innovation of electric network. On the basis of national and international advanced electric knowledge, the dissertation introduces the research hotspot for present electric power syetem as following.
Firstly， This dissertation introduces the building condition of distribution automation(DA), and brings forward two typical construction modes on DA construction， integrative mode and fission mode 。It emphasize the DA structure under the condition of the fission mode a
nd presents the system configuration, the main station scheme, the feeder scheme， the optimized communication scheme etc。, which is for DA research reference。
Secondly， as for the （DA） trouble measurement， position, isolation and resume, This dissertation analyzes the changes of pressure and current for line problem, gets math equation by educing phase short circuit and problem position under the condition of single-phase and works out equation and several parameter s U& , s I＆ and e I＆ table on problem . It brings out optimized isolation and resume plan， realizes auto isolation and network reconstruction, reduces the power off range and time and improves the reliability of electric power supply through problem self— diagnoses and self—analysis。 It also introduces software flow and use for problem judgement and sets a model on network reconstruction and computer flow。
Thirdly, electricity system state is estimated to be one of the key techniques in DA realization. The dissertation recommends the resolvent of bad measurement data and structure mistake on the ground of describing state estimate way。 It also advances a prac
tical test and judging way on topology mistake in state estimate about bad data test and abnormity in state estimate as well as the problem and effect on bad data from state measure to state estimate 。As for real time monitor and control problem， the dissertation introduces a new way to solve them by electricity break and exceptional analysis， and the way has been tested in Weifang DA.

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