本文讨论了用于测试MOV的设置，该设置是指定的特殊设备，用于吸收可能意外发生在我们的电源电线中的瞬时高电流电流。这个想法是凯文先生的要求
技术规格
I'm Kevin Montañez, a university Electrical Engineering student here in Cebu, Philippines. As I told you before, I will get back to you if I have more questions.
我希望您能再次娱乐我的查询。我们决定为小组研究/论文决定的电涌保护电路。这只是我们项目的一部分，它是使用2个与阴极相互连接和移动的阴极的二极管对墙壁插座的内置保护。
Although you have recommended before to use NTC thermistor instead of fuse or diodes, but I am concerned that it will cost much than the diodes. These are my questions:
1.在菲律宾，在大多数住宅建筑中没有扎根，除非他们当然拥有富人的住宅建筑。
这里的许多建筑物是连接的，而不是在国外实行的线到地面。MOV的特征之一是吸收过量电压，其电阻会下降，最终电流将流向其并将被吸收。
吸收的电流将耗散到接地杆上。我的问题是，如何在线路连接中消散电流？
I am asking this so that by the time we will defend for our thesis, we could test it in front of the panel, sadly the school is not line-to-ground connected, and outlets don't have grounding connection.
2。How to test the varistor (MOV) to know if it really works? If it really absorb the surge voltage/current? Say for example, if a motor will be connected in our proposed outlet, it will require a large starting current. How to check if the varistor really absorbed it? What instruments do we need to conduct such testing?
3.如何测试与彼此连接的阴极的2个二极管？
4.我也很好奇，因为您建议您在使用NTC Thermistor之前使用NTC Thermistor，对于此类应用，Thermistor对Thermistor有何评级？如何测试它是否有效？
我祈祷您会尽快阅读并回应。如果您愿意在那里回复，我将附加我的电子邮件地址。
You really are a big help for our thesis and your blog and ideas are a great help as well especially for us students. Please do help us pass this subject.
Thank you very much for sharing your knowledge in Electrical Engineering! Gob bless you more!!!
Best regards,Kevin Montañez
Solving the Circuit Query
需要将MOV连接到线和中性，而不是线和地面，因此MOVS可能不需要地面，基本上它只需要在负载主管输入端子上连接。
An MOV is designed to protect against instantaneous high voltage surges that may last for not more than a few nano seconds....for example if there's an instantaneous voltage spike of say 600 V for 3 nano seconds, the MOV will happily neutralize it by short circuiting it across the connected terminals.
但是，如果这种尖峰甚至可以持续一秒钟，它可能会导致动作被摧毁并着火。
To demonstrate how to test an MOV you would need a 600 V AC source derived by stepping up the domestic 220 V through an auto transformer, and make the circuit set up as shown in the diagram.
Circuit Setup
完美的图显示了一个桥接网络the 600 V AC to 700 V DC and this DC is then fired across the MOV circuit carrying a vulnerable 220 V, 10 watt lamp.
This is done through a 2uF/1KV capacitor in order to protect the MOV as it's not designed to handle sustained high surges.
Normally the connected lamp would instantly get burnt when subjected to this massive 700 V, but the experiment will hopefully show how the massive voltage is successfully absorbed and neutralized by the MOV saving the bulb's life.
不建议进行二极管设置，因为电视二极管碰巧被破坏了，这可能会像短路一样行动，这意味着电线捕捉火灾或爆炸。
An NTC can be selected as per its maximum voltage rating specs, this voltage rating will determine how much instantaneous high voltage the device is rated to restrict.
您好，您的您已经领导了系列DC测试仪..找到轻松受损的LED。
hello basit, you can use a 3v button cell and connect it across the leds, if the led lights up brightly you may assume it to be working otherwise not.
how to test mov either good or bad and how to check that mov continuity using digital multimeter
斯瓦加塔姆爵士美好的一天
Thanks for your Email on topics about “How to Select MOV” posted on : 09 May 2016 02:15 AM PDT.
Sir, I make a ‘Android Mobile Charge Controller’ using IC MC34063 (DC12v to DC5v).
同样，我喜欢使用“ Poly Switch”（XF075）通过输出来保护负载。!!
So, how could I use that ‘POLY switch’ on Output to Limit the Current flow?
请指导我使用上述求解的电路。
Thanks & best regards,
S. Imran。
Image Link:https://www.google.com/imgres?imgurl=http%3A%2F%2Fimg.bizcoco.com%2Fupload%2F20130616%2F0_75A_60V_Polyswitch_Resettable_fuse_Resettable.jpg&imgrefurl=http%3A%2F%2Fhotitem.bizcoco.com%2Fshow%2F1399310%2FPtc-Resettable-Fuse-Schematic-Symbol.html&docid=IHT2znW7BGqmaM&tbnid=GPiQV2xdAy7m3M%3A&w=800&h=640&bih=623&biw=1366&ved=0ahUKEwiE9LXx8ZLNAhUKQI8KHWUQBjUQMwg0KBMwEw&iact=mrc&uact=8
嗨，Syed，Polyswitches类似于NTC，但一旦删除过度流动状况，就可以重置其原始状态。
你只需要把它与积极o系列r the negative supply line of your power supply for the intended protection…..but make sure to use the correctly rated device so that it trips at the right over current specification
Hi sir
I am akram,a university student from sri lanka.. first i would like to thank you for the excellent work of publishing articles and helping out students.
Sir. i need to develop a surge arrestor monitoring device which measure surge currents and when it about to reach its maximum capacity, the device should give signal to remote pc.basically a surge counter
pls help me with this project sir
many thanks
感谢您发布Akram，如果可能的话，我将尝试弄清楚并在本网站上尽快发布。
先生，我该如何确认变种者是否不好
best regards
AKANDE JOSEPH
Akande, there’s no easy way to test it, a bad MOV can be shorted internally or open….the above explained set up can be tried