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We use primary current injection throughout our electric utility any time we install equipment.

Is there any data on sizing the lightning arrestors used on voltage regulators, normally connected source to load?

Dang Scotty - I do believe you are the philosopher among us. :)

Let me throw one more kink in the rope or rock in the soup, whatever. What if you don't do individual relay testing? What if you do system testing by playing simultaneous faults to both ends of the line? Any thoughts?

The engineer is trying to verify that the correct CT is installed in the equipment. See the post below - Current transformer saturation.

You might also try this site: http://www.enoserv.com/index.php

How is the GE D60 relay working for you? Praise? Problems?

Hi All - Does anyone have problems or praise for the REL512 relay. We are thinking of going this route.

Let's see... how many contacts do we need to clean on microprocessor-based relays? How many times do we need to do maintenance on mp-based relaying? Don't get in the trap of relying on any one manufacturer. For high-voltage protection we use two mfgs. relays. Standardization of your panels and...

For Scottf - The neutral is never disturbed. The safety ground is lifted long enough for the test. This would not be done during inclement weather.

Thanks for the replies. We have been meggering secondary CT & PT circuits during troubleshooting when the circuits are in-service for several years with no problems. It is not always possible to take the bus or breaker out of service to megg the circuit while you are hunting for a second ground...

What are the thoughts on megger testing in-service CT or PT secondary wiring? What precautions would you follow. Would it be done at all at your company? Thanks.

<br>&nbsp;I am not sure,&nbsp;&nbsp;but the <A HREF="http://www.batteriesplus.com" TARGET="_new">www.batteriesplus.com</A> website may<br>be of help to you.

<br>&nbsp;In reference to your question of how physics will affect <br>Electrical Engineers directly or indirectly?; I would like to add that the movement of electrons are tightly tied to<br>physics. The same electrons that power your home and auto<br>are collectively called current(I or amps)...