电容检测

电容

电(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)（Capacitance）亦(yi)称作(zuo)“电(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)量(liang)”，是(shi)指在给定电(dian)(dian)(dian)(dian)(dian)(dian)(dian)位差下的(de)(de)(de)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷储(chu)藏量(liang)，记为(wei)C，国际单位是(shi)法拉（F）。一(yi)般来说(shuo)，电(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷在电(dian)(dian)(dian)(dian)(dian)(dian)(dian)场(chang)中会受力而移动(dong)，当(dang)导体(ti)之间有了介质，则阻碍了电(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷移动(dong)而使得电(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷累积在导体(ti)上(shang)，造(zao)成(cheng)(cheng)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷的(de)(de)(de)累积储(chu)存，储(chu)存的(de)(de)(de)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷量(liang)则称为(wei)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)。电(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)是(shi)指容(rong)纳电(dian)(dian)(dian)(dian)(dian)(dian)(dian)场(chang)的(de)(de)(de)能(neng)力。任何静(jing)(jing)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)场(chang)都是(shi)由许多个电(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)组成(cheng)(cheng)，有静(jing)(jing)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)场(chang)就有电(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)，电(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)是(shi)用静(jing)(jing)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)场(chang)描述(shu)的(de)(de)(de)。一(yi)般认为(wei)：孤立导体(ti)与(yu)无(wu)(wu)穷远处构(gou)成(cheng)(cheng)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)，导体(ti)接地(di)等效(xiao)于接到(dao)无(wu)(wu)穷远处，并(bing)与(yu)大地(di)连接成(cheng)(cheng)整体(ti)。

电(dian)(dian)(dian)容(rong)（或(huo)称电(dian)(dian)(dian)容(rong)量）是(shi)表(biao)现电(dian)(dian)(dian)容(rong)器容(rong)纳电(dian)(dian)(dian)荷(he)本领的(de)(de)物理量。电(dian)(dian)(dian)容(rong)从物理学上讲，它(ta)是(shi)一种静态(tai)电(dian)(dian)(dian)荷(he)存(cun)储介质，可能电(dian)(dian)(dian)荷(he)会永久存(cun)在，这是(shi)它(ta)的(de)(de)特征(zheng)，它(ta)的(de)(de)用(yong)途较广，它(ta)是(shi)电(dian)(dian)(dian)子(zi)、电(dian)(dian)(dian)力领域中(zhong)不可缺少的(de)(de)电(dian)(dian)(dian)子(zi)元件(jian)。主要用(yong)于(yu)电(dian)(dian)(dian)源滤(lv)波(bo)、信(xin)号(hao)(hao)滤(lv)波(bo)、信(xin)号(hao)(hao)耦合、谐振、滤(lv)波(bo)、补(bu)偿、充放电(dian)(dian)(dian)、储能、隔直流等电(dian)(dian)(dian)中(zhong)。

电容检测维修

1.检测电解电容

用指针万用表测(ce)量电解电容的(de)步骤(zhou)如下：

（1）首先用电烙铁将待测电解电容器从电路板(ban)上焊下，如(ru)图1所示。

图1 将待测电(dian)(dian)解电(dian)(dian)容从电(dian)(dian)路上焊下

（2）观察(cha)待测电(dian)解电(dian)容器(qi)有(you)无破(po)裂、引脚折断、焦(jiao)黑、漏液(ye)等明显问题。如果有(you)说明该电容(rong)已发生故(gu)障。

（3）将待测电(dian)解电(dian)容的引脚(jiao)擦拭干净，并(bing)用镊(nie)子对其(qi)进行放电(dian)，如图(tu)2所示。

图2 将待测电解电容的引脚擦拭干净并进行(xing)放(fang)电

（4）选择万用(yong)表的万用(yong)表的“R×10”挡，短接两表笔进行调零校正(zheng)如(ru)图3所示。

图3 （a）短接两表笔观(guan)察读数

（b）调(diao)解零(ling)旋钮(niu)将短接读数变为(wei)0

指(zhi)针万用表的(de)档位选(xuan)择(ze)及(ji)校正

（5）将万用表(biao)的(de)红表(biao)笔接电容(rong)器的(de)负极，黑表(biao)笔接电容(rong)器的(de)正极，并观察指针变化如图(tu)4所示。

图4 （a）接(jie)解的瞬间指针有一(yi)个较大偏转

（b）静止后指针停留在(zai)无穷大

用指针万用表测电解电容

经检测当(dang)表(biao)笔接触电(dian)容(rong)(rong)的两(liang)极后(hou)表(biao)针(zhen)先向右(you)迅(xun)速(su)偏(pian)转，然(ran)后(hou)再向左摆到底，说(shuo)明(ming)电(dian)容(rong)(rong)器(qi)基本正常(chang)；如果(guo)表(biao)针(zhen)回转后(hou)所指示(shi)的阻值很小说(shuo)明(ming)电(dian)容(rong)(rong)器(qi)已(yi)击穿；如果(guo)表(biao)针(zhen)无偏(pian)转说(shuo)明(ming)电(dian)容(rong)(rong)器(qi)已(yi)发(fa)生开路。

2.检测贴片电容器

用(yong)数字万(wan)用(yong)表检(jian)测贴片电容器的(de)方法如下：

数字万(wan)用(yong)表一般都(dou)有(you)专门(men)用(yong)来测量(liang)电容的(de)(de)插(cha)孔(kong)，遗憾的(de)(de)是像贴片电容并没(mei)有(you)一对(dui)可以插(cha)进去的(de)(de)合适引脚。因此只能使用(yong)万(wan)用(yong)表的(de)(de)欧(ou)姆挡对(dui)其进行粗略的(de)(de)测量(liang)。即便如此，测量(liang)的(de)(de)结(jie)果仍具有(you)一定的(de)(de)说服(fu)力(li)。

（1）首先观察电容(rong)器有无明显的物(wu)理损坏，如(ru)(ru)果有说(shuo)明电容(rong)器已发生损坏，如(ru)(ru)果没有还需要进一步(bu)进行测量。

（2）用(yong)毛刷将待测贴片电容器(qi)的两极(ji)擦拭(shi)干净(jing)，如(ru)图(tu)5所示(shi)，避免残(can)留在两极(ji)的污(wu)垢影响测量结果。

图(tu)5 用毛刷擦(ca)拭贴片电容器(qi)的两极

（3）为(wei)了测量(liang)的精确(que)性用镊(nie)子对其进(jin)行放电，如(ru)图6所示。

图6 用(yong)镊子对贴片电容放电

（4）选择数字万(wan)用(yong)表(biao)(biao)的(de)二级管挡，并将红表(biao)(biao)笔插在万(wan)用(yong)表(biao)(biao)的(de) VΩ孔，黑表(biao)(biao)笔插在万(wan)用(yong)COM 孔，如图7所示。(插图）

图7 万用表(biao)的二(er)级管

（5）将红黑(hei)表(biao)笔分别接在贴(tie)片电容器的(de)两极(ji)并观察表(biao)盘(pan)读数(shu)变化如图(tu)8所示。

（a）表盘先有一个闪动的阻值(zhi)

（b）静止后读数(shu)为1

贴片电(dian)容(rong)的(de)检测

（6）交(jiao)换(huan)两(liang)表笔(bi)再(zai)测一次，注意观察表盘读数(shu)变化，如图9所示。

（a）表(biao)盘先(xian)有(you)一个闪动的阻(zu)值

（b）静止后读数为1

贴片电容(rong)的检测

两次(ci)测(ce)量(liang)数(shu)(shu)字表均先(xian)有一(yi)个闪动(dong)的(de)数(shu)(shu)值(zhi)(zhi)，而后变为 1.即(ji)阻值(zhi)(zhi)为无穷大(da)，所以该电(dian)(dian)容(rong)器基本正常。如(ru)果用上述(shu)方法检测(ce)，万用表始终显(xian)(xian)示(shi)一(yi)个固(gu)定(ding)的(de)阻值(zhi)(zhi)，说(shuo)明电(dian)(dian)容(rong)器存在漏电(dian)(dian)现象；如(ru)果万用表始终显(xian)(xian)示(shi)“000”，说(shuo)明电(dian)(dian)容(rong)器内部发(fa)(fa)生短路；如(ru)果始终显(xian)(xian)示(shi)“1.”（不存在闪动(dong)数(shu)(shu)值(zhi)(zhi)，直接为 1.），电(dian)(dian)容(rong)器内部极间已发(fa)(fa)生断路。

万用表检测电容

用数(shu)字(zi)万用表检测(ce)电容器(qi)，可按(an)以下方法进行。

一、用(yong)电容档直(zhi)接(jie)检测

某些数字万用表具有测量(liang)(liang)电(dian)容的功能，其量(liang)(liang)程分为2000p、20n、200n、2μ和20μ五(wu)档。测量(liang)(liang)时可将已放电(dian)的电(dian)容两引脚直接插入(ru)表板上的Cx插孔(kong)，选取适当(dang)的量(liang)(liang)程后就(jiu)可读取显(xian)示数据。

2000p档，宜(yi)于(yu)测量(liang)(liang)小(xiao)于(yu)2000pF的(de)(de)(de)电(dian)容(rong)；20n档，宜(yi)于(yu)测量(liang)(liang)2000pF至20nF之间(jian)的(de)(de)(de)电(dian)容(rong)；200n档，宜(yi)于(yu)测量(liang)(liang)20nF至200nF之间(jian)的(de)(de)(de)电(dian)容(rong)；2μ档，宜(yi)于(yu)测量(liang)(liang)200nF至2μF之间(jian)的(de)(de)(de)电(dian)容(rong)；20μ档，宜(yi)于(yu)测量(liang)(liang)2μF至20μF之间(jian)的(de)(de)(de)电(dian)容(rong)。

经(jing)验证明，有些型号的(de)(de)数(shu)字万(wan)用(yong)(yong)表(biao)（例如DT890B+）在测量(liang)50pF以(yi)下的(de)(de)小(xiao)容(rong)(rong)(rong)量(liang)电容(rong)(rong)(rong)器(qi)时误差较(jiao)大，测量(liang)20pF以(yi)下电容(rong)(rong)(rong)几乎没有参(can)考(kao)价值(zhi)。此时可采(cai)用(yong)(yong)串联法(fa)测量(liang)小(xiao)值(zhi)电容(rong)(rong)(rong)。方法(fa)是(shi)：先找一只220pF左右的(de)(de)电容(rong)(rong)(rong)，用(yong)(yong)数(shu)字万(wan)用(yong)(yong)表(biao)测出其实际容(rong)(rong)(rong)量(liang)C1,然后把待测小(xiao)电容(rong)(rong)(rong)与(yu)之并(bing)联测出其总容(rong)(rong)(rong)量(liang)C2，则两者之差（C1－C2）即是(shi)待测小(xiao)电容(rong)(rong)(rong)的(de)(de)容(rong)(rong)(rong)量(liang)。用(yong)(yong)此法(fa)测量(liang)1～20pF的(de)(de)小(xiao)容(rong)(rong)(rong)量(liang)电容(rong)(rong)(rong)很(hen)准确。

二、用电阻档检测

实践(jian)证明，利用(yong)(yong)(yong)数(shu)字(zi)万用(yong)(yong)(yong)表(biao)也可(ke)(ke)观察电(dian)(dian)(dian)(dian)(dian)容(rong)器的(de)(de)(de)充电(dian)(dian)(dian)(dian)(dian)过程(cheng)，这(zhei)实际上(shang)是以(yi)离散的(de)(de)(de)数(shu)字(zi)量反映(ying)充电(dian)(dian)(dian)(dian)(dian)电(dian)(dian)(dian)(dian)(dian)压的(de)(de)(de)变化情况。设(she)数(shu)字(zi)万用(yong)(yong)(yong)表(biao)的(de)(de)(de)测(ce)量速率为n次/秒(miao)，则在观察电(dian)(dian)(dian)(dian)(dian)容(rong)器的(de)(de)(de)充电(dian)(dian)(dian)(dian)(dian)过程(cheng)中，每(mei)秒(miao)钟即可(ke)(ke)看到n个彼此独立且依次增大的(de)(de)(de)读数(shu)。根据(ju)数(shu)字(zi)万用(yong)(yong)(yong)表(biao)的(de)(de)(de)这(zhei)一显示特点，可(ke)(ke)以(yi)检测(ce)电(dian)(dian)(dian)(dian)(dian)容(rong)器的(de)(de)(de)好坏和估测(ce)电(dian)(dian)(dian)(dian)(dian)容(rong)量的(de)(de)(de)大小。下面(mian)介(jie)绍的(de)(de)(de)是使用(yong)(yong)(yong)数(shu)字(zi)万用(yong)(yong)(yong)表(biao)电(dian)(dian)(dian)(dian)(dian)阻(zu)档(dang)检测(ce)电(dian)(dian)(dian)(dian)(dian)容(rong)器的(de)(de)(de)方(fang)法，对于未设(she)置电(dian)(dian)(dian)(dian)(dian)容(rong)档(dang)的(de)(de)(de)仪表(biao)很有(you)实用(yong)(yong)(yong)价值。此方(fang)法适用(yong)(yong)(yong)于测(ce)量0.1μF～几千微法的(de)(de)(de)大容(rong)量电(dian)(dian)(dian)(dian)(dian)容(rong)器 。

三、用电压档检测

用数字万用表(biao)直流电(dian)(dian)压(ya)档检测(ce)电(dian)(dian)容器，实际(ji)上是一(yi)种间接测(ce)量(liang)(liang)法(fa)，此(ci)法(fa)可测(ce)量(liang)(liang)220pF～1μF的(de)小容量(liang)(liang)电(dian)(dian)容器，并且能精确测(ce)出电(dian)(dian)容器漏电(dian)(dian)流的(de)大(da)小。

电容的主要作用

1）旁路(lu)

旁路(lu)电(dian)(dian)容(rong)是(shi)(shi)为本(ben)地(di)器件(jian)(jian)提(ti)供能量(liang)的(de)(de)(de)储能器件(jian)(jian)，它(ta)能使稳压器的(de)(de)(de)输出均匀化，降低负(fu)(fu)载(zai)需求(qiu)。就像小型可(ke)充(chong)电(dian)(dian)电(dian)(dian)池(chi)一样，旁路(lu)电(dian)(dian)容(rong)能够(gou)被(bei)充(chong)电(dian)(dian)，并向(xiang)器件(jian)(jian)进行放电(dian)(dian)。为尽(jin)量(liang)减(jian)少阻抗，旁路(lu)电(dian)(dian)容(rong)要尽(jin)量(liang)靠近负(fu)(fu)载(zai)器件(jian)(jian)的(de)(de)(de)供电(dian)(dian)电(dian)(dian)源(yuan)管脚(jiao)和地(di)管脚(jiao)。这能够(gou)很好地(di)防止输入值过大而导(dao)致的(de)(de)(de)地(di)电(dian)(dian)位抬(tai)高(gao)和噪声。地(di)电(dian)(dian)位是(shi)(shi)地(di)连接处在通过大电(dian)(dian)流(liu)毛刺时的(de)(de)(de)电(dian)(dian)压降。

2）去(qu)耦

去耦，又(you)称(cheng)解耦。从(cong)电(dian)(dian)(dian)路来(lai)说，总是(shi)可以区分(fen)为驱动(dong)的(de)(de)源和(he)被驱动(dong)的(de)(de)负载(zai)。如果(guo)负载(zai)电(dian)(dian)(dian)容比较(jiao)(jiao)大(da)，驱动(dong)电(dian)(dian)(dian)路要把电(dian)(dian)(dian)容充(chong)电(dian)(dian)(dian)、放电(dian)(dian)(dian)，才(cai)能完成信号(hao)的(de)(de)跳变，在上(shang)升沿比较(jiao)(jiao)陡峭的(de)(de)时候，电(dian)(dian)(dian)流(liu)比较(jiao)(jiao)大(da)，这(zhei)样驱动(dong)的(de)(de)电(dian)(dian)(dian)流(liu)就(jiu)(jiu)会(hui)吸收很大(da)的(de)(de)电(dian)(dian)(dian)源电(dian)(dian)(dian)流(liu)，由(you)于电(dian)(dian)(dian)路中(zhong)的(de)(de)电(dian)(dian)(dian)感，电(dian)(dian)(dian)阻（特别是(shi)芯片管脚上(shang)的(de)(de)电(dian)(dian)(dian)感）会(hui)产生反(fan)弹，这(zhei)种电(dian)(dian)(dian)流(liu)相对(dui)于正常情况来(lai)说实(shi)际上(shang)就(jiu)(jiu)是(shi)一种噪声，会(hui)影响前(qian)级的(de)(de)正常工作，这(zhei)就(jiu)(jiu)是(shi)所谓(wei)的(de)(de)“耦合”。

去耦(ou)电(dian)(dian)(dian)容(rong)就是(shi)起到一(yi)个“电(dian)(dian)(dian)池”的作用，满足驱动电(dian)(dian)(dian)路(lu)电(dian)(dian)(dian)流的变化(hua)，避免相互(hu)间的耦(ou)合干(gan)扰，在电(dian)(dian)(dian)路(lu)中进一(yi)步减小电(dian)(dian)(dian)源与参考(kao)地(di)之(zhi)间的高(gao)频干(gan)扰阻抗(kang)。

将(jiang)旁(pang)路电(dian)容(rong)和去(qu)(qu)耦电(dian)容(rong)结合(he)起来(lai)将(jiang)更容(rong)易理(li)解。旁(pang)路电(dian)容(rong)实(shi)际也(ye)是(shi)(shi)去(qu)(qu)耦合(he)的，只是(shi)(shi)旁(pang)路电(dian)容(rong)一(yi)般是(shi)(shi)指高频(pin)旁(pang)路，也(ye)就是(shi)(shi)给(ji)高频(pin)的开关噪声(sheng)提供一(yi)条(tiao)低(di)阻抗泄放途径。高频(pin)旁(pang)路电(dian)容(rong)一(yi)般比较小，根据(ju)谐振频(pin)率(lv)一(yi)般取0.1μF、0.01μF 等；而(er)去(qu)(qu)耦合(he)电(dian)容(rong)的容(rong)量一(yi)般较大(da)，可能是(shi)(shi)10μF 或(huo)者(zhe)更大(da)，依据(ju)电(dian)路中分布参(can)数、以及驱(qu)动电(dian)流的变(bian)化大(da)小来(lai)确定。旁(pang)路是(shi)(shi)把输(shu)入信号(hao)中的干(gan)扰作为滤除对(dui)象，而(er)去(qu)(qu)耦是(shi)(shi)把输(shu)出信号(hao)的干(gan)扰作为滤除对(dui)象，防止干(gan)扰信号(hao)返回电(dian)源(yuan)。这应该是(shi)(shi)他们的本质区别。

3）滤波(bo)

从理论(lun)上(shang)（即假设电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)为纯电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)）说，电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)越大(da)，阻抗越小(xiao)，通过的(de)(de)(de)(de)(de)(de)频(pin)(pin)(pin)率(lv)也越高。但实际上(shang)超过1μF 的(de)(de)(de)(de)(de)(de)电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)大(da)多(duo)为电(dian)(dian)(dian)(dian)解电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)，有很大(da)的(de)(de)(de)(de)(de)(de)电(dian)(dian)(dian)(dian)感(gan)成(cheng)份，所以频(pin)(pin)(pin)率(lv)高后反而(er)阻抗会(hui)(hui)增大(da)。有时会(hui)(hui)看到(dao)有一(yi)个电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)量(liang)较大(da)电(dian)(dian)(dian)(dian)解电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)并(bing)联了一(yi)个小(xiao)电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)，这时大(da)电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)滤低频(pin)(pin)(pin)，小(xiao)电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)滤高频(pin)(pin)(pin)。电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)的(de)(de)(de)(de)(de)(de)作(zuo)用(yong)就(jiu)是(shi)通交流(liu)隔(ge)直流(liu)，通高频(pin)(pin)(pin)阻低频(pin)(pin)(pin)。电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)越大(da)高频(pin)(pin)(pin)越容(rong)(rong)(rong)(rong)(rong)易通过。具体用(yong)在滤波中(zhong)，大(da)电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)（1000μF）滤低频(pin)(pin)(pin)，小(xiao)电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)（20pF）滤高频(pin)(pin)(pin)。曾有网友形象(xiang)地(di)将滤波电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)比(bi)作(zuo)“水塘”。由于电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)的(de)(de)(de)(de)(de)(de)两(liang)端电(dian)(dian)(dian)(dian)压不(bu)会(hui)(hui)突(tu)变，由此可知，信号频(pin)(pin)(pin)率(lv)越高则衰减越大(da)，可很形象(xiang)的(de)(de)(de)(de)(de)(de)说电(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)像个水塘，不(bu)会(hui)(hui)因几(ji)滴(di)水的(de)(de)(de)(de)(de)(de)加入或蒸发而(er)引起(qi)水量(liang)的(de)(de)(de)(de)(de)(de)变化。它把电(dian)(dian)(dian)(dian)压的(de)(de)(de)(de)(de)(de)变动转化为电(dian)(dian)(dian)(dian)流(liu)的(de)(de)(de)(de)(de)(de)变化，频(pin)(pin)(pin)率(lv)越高，峰值电(dian)(dian)(dian)(dian)流(liu)就(jiu)越大(da)，从而(er)缓冲了电(dian)(dian)(dian)(dian)压。滤波就(jiu)是(shi)充电(dian)(dian)(dian)(dian)，放电(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)(de)过程。

4）储能

储能型(xing)电(dian)(dian)容(rong)器通过(guo)(guo)整流(liu)器收集(ji)电(dian)(dian)荷，并(bing)将存(cun)储的(de)(de)能量通过(guo)(guo)变换器引线传送至电(dian)(dian)源(yuan)的(de)(de)输出端(duan)(duan)。电(dian)(dian)压(ya)额(e)定值(zhi)为40～450VDC、电(dian)(dian)容(rong)值(zhi)在220～150 000μF之间的(de)(de)铝电(dian)(dian)解电(dian)(dian)容(rong)器是较(jiao)为常用(yong)的(de)(de)。根(gen)据不同的(de)(de)电(dian)(dian)源(yuan)要求，器件有时会采用(yong)串联、并(bing)联或其组合的(de)(de)形式，对于功率(lv)级超过(guo)(guo)10KW 的(de)(de)电(dian)(dian)源(yuan)，通常采用(yong)体积较(jiao)大的(de)(de)罐(guan)形螺旋端(duan)(duan)子电(dian)(dian)容(rong)器。

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