[RFI] What is a MOV

David Robbins k1ttt at verizon.net
Fri Jan 11 11:57:40 EST 2019

Note that the ones used on distribution power lines often look like fat insulators, either plastic or porcelain... you can tell when you examine them because they will have a wire from the top going to the primary wire on the line and a wire from the bottom to the ground wire of the line.

Here are some examples:
An externally gapped Silicon Carbide arrester on a transformer:  http://ten350.com/index-16-transformers.html  followed by some explanations and pictures of other styles.

A 33kv post arrester with probable explosive disconnect at the bottom:  https://www.alibaba.com/product-detail/CHBC-High-Quality-33KV10KA-Class-2_60493887733.html

Pictures of several styles:  https://en.wikipedia.org/wiki/Surge_arrester

W8ji has good stuff on line hardware here:  https://www.w8ji.com/power_line_noise.htm  about half way down he identifies common hardware on a pole.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373

-----Original Message-----
From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of Ken Winterling
Sent: Friday, January 11, 2019 16:23
To: w2kkz at verizon.net
Cc: rfi at contesting.com
Subject: Re: [RFI] What is a MOV

> Robert,
> Google is your friend...  Try “what is a Metal Oxide Varistor” without 
> the quotes.
> The Metal Oxide Varistor or *MOV* is a voltage dependent, nonlinear 
> device that provides excellent transient voltage suppression. The 
> Metal Oxide Varistor is designed to protect various types of 
> electronic devices and semiconductor elements from switching and induced lightning surges.
> They are used is almost every SMPS (Switch Mode Power Supply) used is just
> about everything today.   They look like thick ceramic disc capacitors and
> come in various glossy colors.
> Ken
> On Fri, Jan 11, 2019 at 11:02 Robert G. Habermehl <w2kkz at verizon.net>
> wrote:
>> What is the MOV that was discussed in a previous post?
>> Robert G. Habermehl
>> Sent from Yahoo Mail on Android
>> --


Sent from one of my mobile devices
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