Difference between a PT & CVT - Electrician Talk - Professional Electrical Contractors Forum
Go Back   Electrician Talk - Professional Electrical Contractors Forum > Electrical Forum > General Electrical Discussion

Thread Tools Display Modes
Old 10-27-2008, 05:37 AM   #1
Join Date: Jun 2008
Location: Pakistan
Posts: 49
Rewards Points: 25
Default Difference between a PT & CVT

What is the difference between a PT(Potential Transformer) & CVT (Capacitor Voltage Transformer) ?
speedtronic is offline   Reply With Quote
Join Contractor Talk

Join the #1 Electrician Forum Today - It's Totally Free!

ElectricianTalk.com - Are you a Professional Electrical Contractor? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's the leading place for electricians to meet online. No homeowners asking DIY questions. Just fellow tradesmen who enjoy talking about their business, their trade, and anything else that comes up. No matter what your specialty is you'll find that ElectricianTalk.com is a great community to join. Best of all it's totally free!

Join ElectricianTalk.com - Click Here JOIN FOR FREE

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ElectricianTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Sponsored Links
Old 10-27-2008, 06:02 AM   #2
Registered Member
Join Date: Feb 2008
Location: orlando florida
Posts: 948
Rewards Points: 500
Default pt cvt

Well a PT uses windings to drop voltage step down transformer high voltage to lower voltage just a transformer only !!! next CVT uses two capacitors in series to drop voltage or split ac like a filter circuit its a tuned 60 cycle resonant cap & coil circuit on primary side . and like a voltage divider circuit but uses capacitors . combined for protection relaying work fault trip zone portection function circuit its also for phase shift ,there really a coupling capacitor voltage splitter circuit centered tap to a reactor coil on primary side input of trans CCVT which is dropped to around 6kv pri input , the center tap of these series caps feed coil and coil feeds trans pri one cap is connected to ground one cap gos to hv line. But multi caps are used in series for the incoming hv line 165kv transmission line , not just two caps by example to make it simple and theres a iron choke coil called a reactor coil it cancels out the caps at 60 cycles for phase shift on output from primary to secondary of CVT transformer theres also a supression circuit on CVT secondary side thats what electricians call it but its just a old snubber circuit for discharge of a potential high voltage spike or back feed kick protection when a major fault occurs on hv transmision line voltage drops off sharply. But the whole circuit works in a delay of false tripping by capacitance stored energy in the caps to hold voltage on primary this controls the tripping time in seconds before a trip of deff relay coils circuits on secondary side which is 115 volts to supply differ relay coils as stated and to control all this with total CVT package circuit and must be included in explaining the difference of both PT and CVT . if you need a full detailed run down how it works just ask? best to ya

Last edited by nick; 10-29-2008 at 05:33 AM. Reason: but its all done today with a microcontrol , its not easy to explain on a post
nick is offline   Reply With Quote
The Following 2 Users Say Thank You to nick For This Useful Post:
nirmal8.2005 (02-09-2012), sushant patil (12-14-2013)

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
difference between the afci breaker and the new combination afci jorgymux0048 General Electrical Discussion 24 03-30-2014 08:37 PM
Difference on Canadian & U.S. licensing personal Off Topic (Non Trade) 13 01-30-2009 10:51 AM
Difference between FVNR & FVR MCC Starter? ms9 General Electrical Discussion 2 06-02-2008 09:42 PM

All times are GMT -4. The time now is 12:58 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Our Pro Sites Network
ContractorTalk.com | DrywallTalk.com | HVACSite.com | PaintTalk.com | PlumbingZone.com | RoofingTalk.com