《电力工程》复习思考题与习题中英对照

《电力工程》复习思考题与习题

教材：《电力工程》，尹克宁，书号ISBN 7-5083-2917-1。 Chapter 1Introduction to power system

1. 2.

Please explain the following terms: dynamic system, power system, and power grid, respectively. 。请解释以下条款：动力系统，电力系统，电网，

Please give the primary features of electric power production and the basic requirements to power system. 请给电力系统的电力生产的主要特点和基本要求 3.

Please point out the quality indexes of electric power production, and their permissible variation range. 请指出，电力生产的质量指标，他们的允许偏差范围 4.

List out the applications of daily-load curve and annual-load curve in the designing and operation of power system. 列出每日负荷曲线和年度负荷曲线，在设计和电力系统运行的应用程序。

Chapter 2 steady state analysis

1 An 180 km single-circuit three-phase line is shown in this figure, with the following line parameters:

r1?0.08?/km;x1?0.4?/km;b1?2.7?10?6s/km. Two step-up transformers (SFL—100000) are paralleled in the sending-end

of the transmission line, U1N/U2N?13.8/242kv,?PK?700kw，?P0?96kw,UK%?12,I0%?1.9. The power

transmitted in this line is 150MW, with load power factor 0.8. 一个180公里，单回路三相线显示在这个数字以下行参数：

r1?0.08?/km;x1?0.4?/km;b1?2.7?10s/km?6。

两个升压变压器（SFL -100000）并联输电线路的发送结束，U1N/U2N?13.8/242kv,,

?PK?700kw?P0?96kw,UK%?12,I0%?1.9,。在这条线发射功率为150mW，与

负载功率因数0.8。

. 5. 6.

路

2 A simple power system is shown in the figure below, and the transformer is rated by(一个简单的电源系统如下图所示，变压器被评为): 下):

SN?31.5MVADetermine the voltage and current at the sending-end (high-voltage side), and the voltage loss of the line, according to the short-line equivalent circuit.。确定在发送端（高压侧）的电压和电流，线路电压损失，根据短期线的等效电路。 Determine the voltage at low-voltage side and active power losses of the transformer, according to the

simplified equivalent circuit of the transformer. 确定在低压侧的变压器有功功率损失电压，根据变压器的简化等效电

,

?PK?190kw，

?P0?31kw,UK%?10.5,I0%?0.7, with the line parameters as follows(行参数如

r1?0.21?/km;x1?0.416?/km;b1?2.74?10?6s/km. When the voltage of sending end UA=120kV, solve for

(1) The voltage loss in transmission line and transformer, respectively.

在输电线路和变压器的电压损失，分别

(2) The low-voltage of transformer and voltage deviation, when the transformer operating in its rated ratio

低电压互感器和电压差，当变压器运行在其额定比率

3. In a substation, two step-up transformers (SFL—31500/110) are paralleled as shown in Fig. Each transformer is rated by(变电

站，升压变压器（SFL-31500/110）并联，如图所示。每个变压器被评为 ):,

?PK?190kw，

?P0?31kw,UK%?10.5. The max load power is最大负载功率是

Smax?40?j25MVA, with Tmax?4500h. Solve for the energy loss of a whole year in this substation.

为解决这个变电站了整整一年的能源损失 4.

What are the resistance and conductance of the overhead transmission line? Is there any direct relationship between the two quantities?

什么是架空输电线路的电阻和电导？两个数量之间是否有直接的关系呢？ 5. 6. 7.

Why it is necessary to use bundled conductors in the HV transmission line at 220 kV and above? 为什么有必要使用捆绑导线在220千伏的高压输电线路及以上？

Please explain the three terms: voltage drop, voltage loss, and voltage deviation, respectively. 请解释三个方面：电压降，电压损失，电压偏差

Please analyze the following two relationships: active balance and frequency regulation, and reactive balance and voltage regulation, and compare frequency regulation with voltage regulation.

请分析以下两个关系：积极的平衡和频率调节，无功平衡和电压调节，频率调节和电压调节比较。 8. 9.

Please compare the frequently used static var compensators (VCR). 请比较常用的静态无功补偿（录像机）

Please describe the primary regulation and secondary regulation of frequency, and list their features respectively. 请描述主要的监管和频率的二次调控，并分别列出他们的特点。

10. Why it is not suitable to adjust the voltage by changing the transformer tap, when there is lack of reactive power in power

system?

为什么它是不适合的，通过改变变压器抽头调整的电压，当是缺乏在电力系统无功？ 11. Please list the effective measure to decrease power loss and power loss in distribution system.

请列出有效的措施，以减少功率损耗和功率损耗，在分配制度。 12. What are power flow analysis and its uses in power system?

什么是功率流分析和其在电力系统的使用？

13. Please analyze the two terms: effective grounding and non-effective grounding.

请分析这两个术语：有效的接地和非有效接地。

14. In the 3-phase system with isolated neutral, when single phase grounding fault occurs, please analyze the variation of current

and voltage.

与中性点不接地的三相系统，当发生单相接地故障，请分析的电压和电流的变化。

15. Please analyze the advantages and disadvantages of four different grounding modes, and give their application in power

system

请分析四个不同的接地方式的优点和缺点，并给予他们在电力系统中的应用 Chapter 3 Primary system 1. 2. 3. 4.

What does the term “bus arrangement” mean? And list the basic requirements to it in power system. 是什么“的公交车安排”一词是什么意思？并列出它在电力系统中的基本要求 Please point out the main types of bus arrangement in power system. 请指出巴士安排在电力系统的主要类型。

Please give the basic rules for the operation of breaker and disconnector? 请给断路器和隔离开关的操作的基本规则？

What is the bridge-arrangement? Please compare inner bridge with outer bridge.

桥是什么安排？请与外桥内桥。 5.

What are the features of ac arc? Please list the commonly used methods to improve the arc-distinguishing ability of HV switch.

交流弧焊的特点是什么？请列出常用的方法，以提高高压开关弧鉴别力 6. 7. 8.

Please compare step voltage to contact voltage. 请比较跨步电压，接触电压。

What are the basic requirements to the circuit breaker of power system? 电力系统断路器的基本要求是什么？ Please explain the minimum electric distance of distribution equipment. 请解释配电设备的最低电距离。

1. An infinite power system is shown in the figure below. When three-phase short circuit occurs in low-voltage buses, 一个无穷的动力系统，如下图所示。当三相短路发生在低电压巴士，

(1) Draw the equivalent circuit, modeling transformer as simplified equivalent circuit. 画出等效电路，变压器的简化等效电路建模。

(2) Compute the rms (root-mean-square) value of the periodic component of short-circuit current and short-circuit power in the fault point. 计算周期分量的短路电流和短路故障点的电源的RMS（均方根）值。

(3) Compute the corresponding impulse short-circuit current. 计算相应的短路电流脉冲。

Please solve the above questions in real value and per-unit, respectively）请解决上述问题的实际价值和单位，分别。 2. 3. 4. 5. 6.

What does the infinite power source mean? 无穷的动力源是什么意思？

What are the main types of short-circuit faults on power system? And which one is the most frequent one? 什么是对电力系统短路故障的主要类型是什么？哪一个是最频繁的一个呢？

Why the per-unit method is widely used in power system? 为什么每单位的方法是在电力系统中广泛使用

Please give the similarities and differences between the two methods of per-unit and real value. 请给的单位和实际价值的两种方法之间的相似和差异

Please analyze the components and their mathematical expression of short-circuit current in the transient process of three-phase short-circuit fed by infinite power source. And explain the variation of short-circuit current. 请在无穷的动力源的三相短路美联储的暂态过程的分析组件和它们的短路电流的数学表达式。并解释短路电流的变化。 7. 8.

What is “impulse factor”? And give its typical values in engineering computation. 什么是“冲动因素”？并给予其典型值在工程计算。

Please take some examples to explain the symmetrical and unsymmetrical short-circuit faults. Please list the computation procedures of unsymmetrical short-circuit fault. 请采取一些例子来解释对称和非对称短路故障。请列出不对称短路故障计算程序。 9.

Aiming at the single phase-to-ground fault, analyze its characteristics and terminal condition, and draw its three sequence networks and interconnecting sequence network. 为了在单相接地故障，分析其特点和终端条件，并绘制它的三个序列的网络和互联序列网络。

10. What are the symmetrical component model? Please describe its use in power system analysis, and the procedures to compute

the short-circuit current when unsymmetrical fault occurs on power system. 什么是对称的组件模型？请描述其在电力系统的分析的使用，和程序来计算短路电流不对称电力系统发生故障时。

11. Consider an unbalanced three-phase system, 考虑一个不平衡的三相系统

UA?80?10?V,UB?80?135?V,UC?85?160?V???Chapter 4 Short-circuit

. Please point out whether there are zero-sequence and negative sequence

components in this system, and compute them. 请指出是否有在这个系统中的零序和负序分量，并计算它们 Chapter 5 Stability 1. 2. 3. 4. 5.

Please explain the basic concept of the stability of power system, and list the classification of stability. 请解释电力系统稳定性的基本概念，并列出分类的稳定性。

What is the power-angle relationship of the generator? 发电机功角的关系是什么？

Please explain the steady stability of power system, and give the stability criterion. 请解释电力系统的稳定稳定，并给予稳定判据

What is the transient stability? 什么是暂态稳定？

Please list the commonly used measures to improve the steady stability of power system. 请列出常用的措施，以提高电力系统的稳定稳定。 Chapter 6 the secondary system 1. 2. 3. 4. 5.

Please list the main equipment of the secondary system in power plant and substation? 请列出在电厂和变电站二次系统的主要设备？

Please describe the basic elements of relay protective equipment, and list the basic requirements to it. 请描述继电器保护设备的基本要素，并列出它的基本要求。

Please explain: 3-phase one shot reclosuring. 请解释：3，第一阶段的拍摄reclosuring(reclosure 重合闸)。

Please compare the two terms: normally open contact and normally closed contact. 请比较两个方面：常开触点和常闭触点。 Please compare the two terms in over-current protection: inverse-time characteristic, fixed-time characteristic 请比较这两个词在过电流保护：反时限特性，固定时间的特点