电力系统自动装置考试习题.doc

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1、7/7电力系统自动装置试题一、单项选择题(本大题共10小题，每小题1.5分，共15分)在每小题列出的四个选项中只有一个选项是符合题目要求的，请将正确选项前的字母填在题后的括号内。1.衡量电能质量的重要指标是(    ) A.有功功率、无功功率                                             B.功率因数 C.电压、频率和波形                                                       D.有功电度和无功电度2.为防止断路器多次重合于永久性故障，

2、重合闸装置接线中设置了(    ) A.方向继电器                                                          B.差动继电器 C.防跳继电器                                                           D.阻抗继电器3.我国电力系统220KV线路的故障类型中，有接近90%的故障是(    ) A.三相短路                                                           

3、          B.两相短路 C.单相接地短路                                                              D.两相接地短路4.准同步并列条件规定的允许电压差为不超过额定电压的(    ) A.3%～5%                                                                     B.5%～10% C.10%～15%                                              

4、             D.15%～20%5.与正弦整步电压最小值所对应的相角差一定等于(    ) A.0度                                                                            B.90度7/7 C.180度                                                                  D.270度6.具有正调差特性的同步发电机，当输出的无功电流增大时，机端电压(    ) A.不变      

5、                                                                      B.增大 C.以上两条都有可能                                                       D.减小7.励磁绕组上的瞬时过电压，会(    ) A.烧坏转子铁芯                                                              B.危害系统运行的稳定性 C.危害励磁绕组绝缘         

6、                                              D.以上三项都有8.自动励磁调节器的强励倍数一般取(    ) A.2—2.5                                                                  B.2.5—3 C.1.2—1.6                                                               D.1.6—2.09.在励磁调节器中，若电压测量采用12相桥式整流电路，则

7、选频滤波电路的滤波频率应选为(    )Hz A.50                                                                     B.300 C.600                                                                    D.120010.机端并联运行的各发电机组的调差特性(    ) A.可以为负                                                      

8、               B.可以为零 C.必须为零                                                                     D.必须为正第二部分 非选择题二、名词解释(本大题共7