Some cheap GFCIs are susceptible to high frequency noise, such as a slight arc when a switch is opened on an inductive load. The better ones will state that they are resistant to nuisance trips. A nuisance trip is not a ground fault, it is a false trip due to electrical noise.A Hubbel brand is probably the best.
Motors do create significant start/stop transients, and AC/DC motors can create a lot of run hash as well. These transients can "fool" GFCIs. But both the motors and the GFCIs have been modified over the past 30 years to where such problems are far less likely than originally.If a motor is tripping a GFCI my first suspicion would be the GFCI.
Our hairdryer used to trip the GFCI also. It started out with an occasional trip, but eventually it would trip every time the hairdryer was plugged in or unplugged... even with the motor off. I replaced the GFCI and it's been trouble free ever since. of course, this may or may not apply to your GFCI.
我顺你的判断去网上找,没见到任何信息。
那个问题KItchenAid Mixer 是 7-Qt Pro series
https://www.kitchenaid.com/countertop-appliances/stand-mixers/bowl-lift-stand-mixers/p.pro-line-series-7-quart-bowl-lift-stand-mixer.ksm7586pca.html
据说用直流电机
看看这个https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.westernautomation.com/wp-content/uploads/2016/03/GFCIs_For_AC_DC_Systems.pdf&ved=2ahUKEwill5D_h_v0AhWidt8KHSiFDigQFnoECCcQAQ&usg=AOvVaw1E1TSWU7dTaSEt45hb7Sba
of GFCI and circuit breaker.
判断什么原因有时很难,你可以用排除法试。也不用相信谁的判断,因为大家都是根据你说的信息自己推断,都是有可能的原因,但不一定是你的原因。
GFCI是漏电保护,不是过载保护,这是常识。原理不一样,不是double E就可以否定的,自己google,看百科.
https://zh.wikipedia.org/wiki/%E6%8E%A5%E5%9C%B0%E6%BC%8F%E7%94%B5%E4%BF%9D%E6%8A%A4%E6%8F%92%E5%BA%A7
https://www.howtolookatahouse.com/Blog/Entries/2021/7/does-a-gfci-trip-if-you-overload-the-circuit.html
但我也不否定GFCI在过载时可能会跳,但这种跳不是因为GFIC有这个功能。
如果你circuit breaker是20A, 当然GFCI可以用20A, 但是GFCI不能用高于circuit breaker的rate,违反code。
我给你出的主意是先确认是你现在的GFCI有没有问题,不行再买新的换上。我前面的帖子说的不太清楚,可能让别人误解了,我要说的是裸线别离hot line的接线柱(铜螺丝钉)太近。如果试了,还是跳,那就不是我说的这个情况。
新的code要求厨房都是20A的,许多新电器会在15A的breaker下跳闸,即使没有GFCI,时间长了,电线过热,circuit breaker也会跳。
也可以安在配电盘上。这是考电工证时学的。也可能不全面。
我是凭经验,没理论。
小兄弟现在厉害了,经常看你帖子,知识面很广了。
我现在把15A GFCI receptacle 换成20A的,看看还有没有问题(要等到下次用那个mixer)。
以后闲着没事再换个新点的15A GFCI receptacle 试试。据说UL 新标准要求 GFCI 能容忍这些乱七八糟的波。
如果直流电机就是用简单的可控硅控制电流那就是 wave type 4-5-6 那样的。
我原来也不知道这些,买房时请的 inspector 指给我看,哪些是 GFCI,哪些是 AFCI
那个15A 的 GFCI receptacle 比较老式,太敏感了,不该管的事触发了保护机制。
以后有闲空买个新的 15A GFCI receptacle 换回去试试。见这个 forum
https://www.finehomebuilding.com/forum/tripping-gfci
Quote:
Some cheap GFCIs are susceptible to high frequency noise, such as a slight arc when a switch is opened on an inductive load. The better ones will state that they are resistant to nuisance trips. A nuisance trip is not a ground fault, it is a false trip due to electrical noise.A Hubbel brand is probably the best.
Motors do create significant start/stop transients, and AC/DC motors can create a lot of run hash as well. These transients can "fool" GFCIs. But both the motors and the GFCIs have been modified over the past 30 years to where such problems are far less likely than originally.If a motor is tripping a GFCI my first suspicion would be the GFCI.
Our hairdryer used to trip the GFCI also. It started out with an occasional trip, but eventually it would trip every time the hairdryer was plugged in or unplugged... even with the motor off. I replaced the GFCI and it's been trouble free ever since. of course, this may or may not apply to your GFCI.
第二个人来,三个钟头过去了,他自己都快炸了。我说你能让我看一眼电路么?他倒爽气地给了,我一看就说别气愤,这个电阻接错地方了,一开始就错了,你把它重接就可以了。
理论上,包括产品说明书,一般的GFCI只对漏电有保护,和过载保护无关,当然有双重功能的,但一般用在电箱里,不会用在插座处。漏电和过载有关系吗?电流过大,原来不漏电的地方就会漏,GFCI就会跳闸,至于为何过载保护的装置没跳闸,那是电工的事。只是讲一点,过载引起漏电也是有可能的。
第一,如果大电流就漏电,那么功率大的电器也应该跳。在那个问题插座(15A GFCI receptacle)上,这个KitchenAid mixer (970W) 不是功率最大的,试过功率比它大的多的电磁炉(1500W 近满载15A, 还有超载的1800W超过15A)都没事。如果15A GFCI receptacle 不多管闲事的只保护漏电的话,那么应该是这个 mixer 内部漏电;
第一,插到其他许多20A GFCI receptacle 都不跳。这么看这个mixer 没有内部漏电。
我只能推断这个15A GFCI receptacle管了其他闲事,或许换个新的就好了。我目前是换了新的20A GFCI receptacle,要等到用mixer 才知道是否不再闹。