一(Yi)、(?)测(Ce)量(Liang)目(Mu)的(De)
1、(?)检(Jian)查(Cha)导(Dao)电(Dian)回(Hui)路(Lu)是(Shi)否(Fou)存(Cun)在(Zai)短(Duan)路(Lu)、(?)开(Kai)路(Lu)或(Huo)接(Jie)错(Cuo)线(Xian);(?)
2、(?)检(Jian)查(Cha)绕(Rao)组(Zu)导(Dao)线(Xian)的(De)焊(Han)接(Jie)点(Dian)、(?)引(Yin)线(Xian)与(Yu)套(Tao)管(Guan)的(De)连(Lian)接(Jie)处(Chu)是(Shi)否(Fou)良(Liang)好(Hao)、(?)分(Fen)接(Jie)开(Kai)关(Guan)有(You)无(Wu)接(Jie)触(Chu)不(Bu)良(Liang)等(Deng)。(?)
3、(?)还(Huan)可(Ke)以(Yi)核(He)对(Dui)绕(Rao)组(Zu)所(Suo)用(Yong)的(De)导(Dao)线(Xian)规(Gui)格(Ge)是(Shi)否(Fou)符(Fu)合(He)设(She)计(Ji)要(Yao)求(Qiu)。(?)
二(?)、(?)测(Ce)量(Liang)方(Fang)法(Fa)
1、(?)电(Dian)流(Liu)电(Dian)压(Ya)法(Fa)
其(Qi)原(Yuan)理(Li)是(Shi)在(Zai)被(Bei)测(Ce)绕(Rao)组(Zu)中(Zhong),(?)通(Tong)以(Yi)适(Shi)当(Dang)大(Da)小(Xiao)的(De)直(Zhi)流(Liu)电(Dian)流(Liu),(?)然(Ran)后(Hou)测(Ce)量(Liang)绕(Rao)组(Zu)中(Zhong)的(De)电(Dian)流(Liu)和(He)绕(Rao)组(Zu)两(Liang)端(Duan)的(De)电(Dian)压(Ya)降(Jiang),(?)再(Zai)根(Gen)据(Ju)欧(Ou)姆(Mu)定(Ding)律(Lu),(?)即(Ji)可(Ke)算(Suan)出(Chu)绕(Rao)组(Zu)的(De)直(Zhi)流(Liu)电(Dian)阻(Zu)。(?)
测(Ce)量(Liang)时(Shi),(?)所(Suo)用(Yong)仪(Yi)表(Biao)应(Ying)不(Bu)低(Di)于(Yu)0.5级(Ji),(?)电(Dian)流(Liu)表(Biao)应(Ying)选(Xuan)用(Yong)内(Nei)阻(Zu)较(Jiao)小(Xiao)的(De),(?)电(Dian)压(Ya)表(Biao)应(Ying)选(Xuan)用(Yong)较(Jiao)高(Gao)内(Nei)阻(Zu)的(De)表(Biao),(?)引(Yin)线(Xian)要(Yao)有(You)足(Zu)够(Gou)的(De)截(Jie)面(Mian)。(?)测(Ce)量(Liang)电(Dian)感(Gan)量(Liang)较(Jiao)大(Da)的(De)绕(Rao)组(Zu)时(Shi),(?)还(Huan)需(Xu)要(Yao)有(You)足(Zu)够(Gou)的(De)充(Chong)电(Dian)时(Shi)间(Jian)。(?)绕(Rao)组(Zu)通(Tong)过(Guo)的(De)电(Dian)流(Liu)应(Ying)限(Xian)制(Zhi)在(Zai)绕(Rao)组(Zu)额(E)定(Ding)电(Dian)流(Liu)的(De)百(Bai)分(Fen)之(Zhi)二(?)十(Shi)以(Yi)内(Nei)。(?)
该(Gai)方(Fang)法(Fa)的(De)主(Zhu)要(Yao)缺(Que)点(Dian)是(Shi)需(Xu)要(Yao)较(Jiao)长(Chang)的(De)时(Shi)间(Jian)才(Cai)能(Neng)测(Ce)出(Chu)准(Zhun)确(Que)值(Zhi)。(?)因(Yin)为(Wei)每(Mei)相(Xiang)绕(Rao)组(Zu)可(Ke)以(Yi)等(Deng)效(Xiao)成(Cheng)电(Dian)阻(Zu)和(He)电(Dian)感(Gan)的(De)串(Chuan)联(Lian)电(Dian)路(Lu),(?)在(Zai)接(Jie)通(Tong)电(Dian)源(Yuan)后(Hou),(?)电(Dian)感(Gan)中(Zhong)电(Dian)流(Liu)从(Cong)零(Ling)逐(Zhu)渐(Jian)增(Zeng)加(Jia)到(Dao)电(Dian)源(Yuan)电(Dian)压(Ya),(?)然(Ran)后(Hou)逐(Zhu)渐(Jian)下(Xia)降(Jiang)到(Dao)稳(Wen)态(Tai)值(Zhi),(?)需(Xu)要(Yao)一(Yi)个(Ge)过(Guo)渡(Du)过(Guo)程(Cheng),(?)过(Guo)渡(Du)时(Shi)间(Jian)的(De)长(Chang)短(Duan)取(Qu)决(Jue)于(Yu)电(Dian)路(Lu)的(De)时(Shi)间(Jian)常(Chang)数(Shu)t=L/(?)R。(?)
2、(?)平(Ping)衡(Heng)电(Dian)桥(Qiao)法(Fa)
平(Ping)衡(Heng)电(Dian)桥(Qiao)法(Fa)是(Shi)采(Cai)用(Yong)电(Dian)桥(Qiao)平(Ping)衡(Heng)的(De)原(Yuan)理(Li)来(Lai)测(Ce)量(Liang)直(Zhi)流(Liu)电(Dian)阻(Zu),(?)常(Chang)用(Yong)的(De)平(Ping)衡(Heng)电(Dian)桥(Qiao)法(Fa)有(You)单(Dan)臂(Bi)电(Dian)桥(Qiao)或(Huo)双(Shuang)臂(Bi)电(Dian)桥(Qiao)两(Liang)种(Zhong)。(?)这(Zhe)种(Zhong)方(Fang)法(Fa)可(Ke)以(Yi)直(Zhi)接(Jie)读(Du)取(Qu)数(Shu)据(Ju),(?)准(Zhun)确(Que)度(Du)较(Jiao)高(Gao),(?)在(Zai)中(Zhong)、(?)小(Xiao)型(Xing)变(Bian)压(Ya)器(Qi)的(De)实(Shi)际(Ji)测(Ce)量(Liang)中(Zhong),(?)大(Da)多(Duo)采(Cai)用(Yong)直(Zhi)流(Liu)电(Dian)桥(Qiao)法(Fa),(?)当(Dang)被(Bei)试(Shi)线(Xian)圈(Quan)的(De)电(Dian)阻(Zu)值(Zhi)在(Zai)1Ω以(Yi)上(Shang)的(De)一(Yi)般(Ban)用(Yong)单(Dan)臂(Bi)电(Dian)桥(Qiao)测(Ce)量(Liang),(?)1Ω以(Yi)下(Xia)的(De)则(Ze)用(Yong)双(Shuang)臂(Bi)电(Dian)桥(Qiao)测(Ce)量(Liang)。(?)在(Zai)使(Shi)用(Yong)双(Shuang)臂(Bi)电(Dian)桥(Qiao)接(Jie)线(Xian)时(Shi),(?)电(Dian)桥(Qiao)的(De)电(Dian)位(Wei)桩(Zhuang)头(Tou)要(Yao)靠(Kao)近(Jin)被(Bei)测(Ce)电(Dian)阻(Zu),(?)电(Dian)流(Liu)桩(Zhuang)头(Tou)要(Yao)接(Jie)在(Zai)电(Dian)位(Wei)桩(Zhuang)头(Tou)的(De)上(Shang)面(Mian)。(?)测(Ce)量(Liang)前(Qian),(?)应(Ying)先(Xian)估(Gu)计(Ji)被(Bei)测(Ce)线(Xian)圈(Quan)的(De)电(Dian)阻(Zu)值(Zhi),(?)将(Jiang)电(Dian)桥(Qiao)倍(Bei)率(Lu)旋(Xuan)钮(Niu)置(Zhi)于(Yu)适(Shi)当(Dang)位(Wei)置(Zhi),(?)将(Jiang)非(Fei)被(Bei)测(Ce)线(Xian)圈(Quan)短(Duan)路(Lu)并(Bing)接(Jie)地(Di),(?)然(Ran)后(Hou)打(Da)开(Kai)电(Dian)源(Yuan)开(Kai)关(Guan)充(Chong)电(Dian),(?)待(Dai)充(Chong)足(Zu)电(Dian)后(Hou)按(An)下(Xia)检(Jian)流(Liu)计(Ji)开(Kai)关(Guan),(?)迅(Xun)速(Su)调(Diao)节(Jie)测(Ce)量(Liang)臂(Bi),(?)使(Shi)检(Jian)流(Liu)计(Ji)指(Zhi)针(Zhen)向(Xiang)检(Jian)流(Liu)计(Ji)刻(Ke)度(Du)中(Zhong)间(Jian)的(De)零(Ling)位(Wei)线(Xian)方(Fang)向(Xiang)移(Yi)动(Dong),(?)进(Jin)行(Xing)微(Wei)调(Diao),(?)待(Dai)指(Zhi)针(Zhen)平(Ping)稳(Wen)停(Ting)在(Zai)零(Ling)位(Wei)上(Shang)时(Shi)记(Ji)录(Lu)电(Dian)阻(Zu)值(Zhi),(?)此(Ci)时(Shi),(?)被(Bei)测(Ce)线(Xian)圈(Quan)电(Dian)阻(Zu)值(Zhi)=倍(Bei)率(Lu)数(Shu)×测(Ce)量(Liang)臂(Bi)电(Dian)阻(Zu)值(Zhi)。(?)测(Ce)量(Liang)完(Wan)毕(Bi),(?)先(Xian)放(Fang)开(Kai)检(Jian)流(Liu)计(Ji)按(An)钮(Niu),(?)再(Zai)放(Fang)开(Kai)电(Dian)源(Yuan)开(Kai)关(Guan)。(?)
3、(?)变(Bian)压(Ya)器(Qi)直(Zhi)流(Liu)电(Dian)阻(Zu)三(San)相(Xiang)绕(Rao)组(Zu)同(Tong)时(Shi)加(Jia)压(Ya)法(Fa)
三(San)相(Xiang)绕(Rao)组(Zu)同(Tong)时(Shi)加(Jia)电(Dian)压(Ya)测(Ce)量(Liang)变(Bian)压(Ya)器(Qi)的(De)直(Zhi)流(Liu)电(Dian)阻(Zu),(?)是(Shi)根(Gen)据(Ju)楞(Leng)次(Ci)定(Ding)律(Lu),(?)使(Shi)各(Ge)相(Xiang)电(Dian)流(Liu)所(Suo)产(Chan)生(Sheng)的(De)磁(Ci)通(Tong)在(Zai)铁(Tie)芯(Xin)中(Zhong)相(Xiang)互(Hu)抵(Di)消(Xiao),(?)合(He)成(Cheng)磁(Ci)通(Tong)为(Wei)零(Ling),(?)从(Cong)而(?)减(Jian)小(Xiao)电(Dian)感(Gan)L值(Zhi),(?)使(Shi)电(Dian)路(Lu)的(De)时(Shi)间(Jian)常(Chang)数(Shu)减(Jian)小(Xiao),(?)即(Ji)减(Jian)少(Shao)了(Liao)测(Ce)量(Liang)直(Zhi)流(Liu)电(Dian)阻(Zu)的(De)时(Shi)间(Jian),(?)提(Ti)高(Gao)了(Liao)工(Gong)作(Zuo)效(Xiao)率(Lu)。(?)在(Zai)测(Ce)量(Liang)时(Shi),(?)还(Huan)应(Ying)考(Kao)虑(Lu)绕(Rao)组(Zu)电(Dian)阻(Zu)的(De)大(Da)小(Xiao)受(Shou)温(Wen)度(Du)影(Ying)响(Xiang)的(De)因(Yin)素(Su)和(He)直(Zhi)流(Liu)电(Dian)阻(Zu)的(De)不(Bu)平(Ping)衡(Heng)率(Lu)等(Deng)问(Wen)题(Ti)。(?)用(Yong)电(Dian)压(Ya)降(Jiang)法(Fa)测(Ce)量(Liang)直(Zhi)流(Liu)电(Dian)阻(Zu)需(Xu)要(Yao)很(Hen)长(Chang)的(De)时(Shi)间(Jian)才(Cai)能(Neng)获(Huo)得(De)准(Zhun)确(Que)值(Zhi),(?)主(Zhu)要(Yao)由(You)于(Yu)线(Xian)圈(Quan)中(Zhong)通(Tong)入(Ru)的(De)电(Dian)流(Liu)在(Zai)变(Bian)化(Hua)过(Guo)程(Cheng)中(Zhong),(?)在(Zai)高(Gao)导(Dao)磁(Ci)率(Lu)的(De)铁(Tie)芯(Xin)中(Zhong)产(Chan)生(Sheng)磁(Ci)通(Tong),(?)致(Zhi)使(Shi)L增(Zeng)大(Da)。(?)若(Ruo)使(Shi)磁(Ci)通(Tong)减(Jian)少(Shao),(?)也(Ye)就(Jiu)降(Jiang)低(Di)了(Liao)L值(Zhi),(?)则(Ze)电(Dian)流(Liu)变(Bian)化(Hua)的(De)时(Shi)间(Jian)((?)取(Qu)决(Jue)于(Yu)时(Shi)间(Jian)常(Chang)数(Shu))(?)便(Bian)减(Jian)小(Xiao)。(?)