电网

By the unserved energy cost quantifying the reliability benefits of alternatives, costs and benefits about electric power network reliability planning can be evaluated on a consistent and economic basis.

以用户缺电成本大小衡量可靠性效益高低，将规划的可靠性成本与可靠性效益统一在对电网的经济性评估上；通过构造缺电损失评价率给出缺电成本计算方法。

The electricity was then stored in batteries or fed into the grid of the local utility company.

当时的电力储存在电池或馈入电网的当地公用事业公司。

This text introduce a sort of new pattern soft switch PFC circuit .First, analyze the develop course of the on-off power supply. Second, relate the harm of humorous wave to the commonality electricity net. Third, present the topology and the principium chart of the soft switch PFC and analyze it .At last ,set the parameter and simulates the converter of with matlab simulation. more over ,get the hold of well voltage and current wave , minish the spoilage of the circuit, enhance the efficience of the circuit, meet the demand of the miniaturization and viridity.

本文引入了一种新型的软开关PFC电路，首先分析了开关电源的发展历程，然后讲了谐波给公共电网造成的危害，再给出了这种软开关PFC的电路拓扑及原理图并对其工作原理进行了分析，最后对其参数进行设置在MATLAB软件进行了仿真，并得到了良好的电压电流波形，而且减小了电路的损耗，提高了电路的效率，实现了小型化，绿色化的要求。

Study the control policy of Automatic Control of Vol/Var of Power System which considers transformer economic operation.

研究了考虑变压器经济运行的电网电压无功控制系统的控制策略 4。

What you will find, looking about you, is a world whereThe grid is down, no electricity or phone serviceNo tap water, and ground water cloudy with volcanic dust falloutCivilization brought to a halt by the broken link.

你将发现周围是个这样的世界：电网崩溃了，电力和电话服务不复存在；没有了自来水，地面水源充满了火山灰沉降物；商店货架上剩余的物品遭到了劫掠，不能再购买杂货；社会联系断裂，人类文明中止。

Grid voltage in accordance with corporate standards and requirements for power factor to determine the motor's voltage rating and type.

根据企业的电网电压标准和对功率因数的要求，确定电动机的电压等级和类型。

It wasn't until a decade after municipal electrical networks were up and running that another inventor came up with a reliable watt-hour meter.

直到差不多十年之后，到市政府的电网建立起来投入使用的时候，才有另外一个人发明出了一种可靠的瓦特-小时表。

But what's the main reason for the wattless circumfluence in Gansu power grid?

那么，甘肃电网内无功环流存在的主要原因是什么？

The writer gives some advice and measures on the basis of analysis and calculation to the two wattless circumfluences existed in Gansu Power Grid.

笔者对甘肃电网内两个电磁环网进行计算分析的基础上，提出了结论性的建议和措施。

To ensure the voltage quality and improve the power factor of the oilfield electric network and reduce the power lossalong the wile, in-situ wattless compensation technology is adopted on the electric motor, i.

为保证电网电压质量，提高功率因数，降低线路损耗，可对电动机实行无功就地补偿，即在电动机旁配备适当的低压小型电力电容器装置来补偿电动机的无功功率。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。