问题 问答题 简答题

什么是线损理论计算?目的是什么?

答案

参考答案:

线损理论计算就是根据电网在某一运行方式下的实际负荷和供电设备参数情况,计算电网和电网中每一元件的理论有功功率损耗、无功功率损耗和在一定时间内的输送和分配电能时的电能损耗。

线损理论计算的目的是:

(1)分析电网结构及运行方式的经济性;

(2)查明电网中损耗过大的元件及损耗大的原因:

(3)考核实际线损是否真实、准确、合理以及实际线损率和理论线损率的差值,确定不明损耗的大小,并用此结果衡量供用电管理的好坏,从而有的放矢地采取适当的措施,确定管理工作的重点,最终减少不明损耗:

(4)根据线损理论计算中导线损耗和变压器损耗所占的比重,以及电网中固定损耗和可变损耗所占的比重,可以针对电力网的某些薄弱环节确定技术降损的主攻方向,从而采取有效措施使线损不断下降;

(5)为电网的发展、改进和规划提供科学的依据;

(6)为制定年度、季度、月度线损计划指标和降损措施,提供科学的理论数据;

(7)为节电量统计数据的真实性提供参考,以便于总结节电事例,推广节电经验、争取更多的节电成果;

(8)通过线损理论计算,有利于加深对电力传输和用电管理方面的理论知识,从而提高业务管理水平。

单项选择题
阅读理解

It’s 2035. You have a job, a family and you’re about 40 old. Welcome to your future life.

Getting ready for work, you pause in front of the mirror, “Turn red,” you say. Your shirt changes from sky blue to deep red. Tiny preprogrammed electronics are rearranged in your shirt to change its color. Looking into the mirror, you find it hard to believe that you are 40. You look much younger. With amazing advances in medicine, people in your generation may live to be 150 years old. You’re not even middle-aged.

As you go into the kitchen and prepare to pour your breakfast cereal into a bowl, you hear: “To lose weight, you shouldn’t eat that,” from your shoes. They read the tiny electronic code on the cereal box to find out the nutrition details. You decide to listen to your shoes. “Kitchen, what can I have for breakfast?” A list of possible foods appear on the counter as kitchen checks its food supplies.

“Ready for your trip to space. You ask your son and daughter.” In 2005 only specially trained astronauts went into space — and very few of them. Today anyone can go to space for day trips or longer vacation. Your best friend even works in space. Handing your children three strawberries each, your add, “The doctor said you need these for space travel.” Thanks to medical advices, vaccination shots are a thing of the past. Ordinary foods contain specific vaccines. With the berries in their mouths, the kids head for the front door.

It’s time for you to go to work. Your car checks your fingerprints and unlocks the doors. “My office. Autopilot,” you command. Your car drives itself down the road and moves smoothly into traffic on the highway. You sit back and unroll your e-newspaper. The latest news downloads and fills the viewer. Looking through the pages, you watch the news as video films rather than read it.

小题1:What changes the color of your shirt?

A.The mirror.

B.The counter.

C.The shirt itself.

D.The medicine.小题2:How do the shoes know that your shouldn’t eat the breakfast cereal?

A.By pouring the breakfast into a bowl.

B.By listening to the doctor’s advice.

C.By testing the food supplies in the kitchen.

D.By checking the nutrition details of the food.小题3:The strawberries the children eat serve as         .

A.lunch

B.vaccines

C.breakfast

D.nutrition小题4:How is the text organized?

A.In order of time.

B.In order of frequency.

C.In order of preference.

D.In order of importance.