- Joined
- Feb 7, 2011
- Messages
- 5,039
I just purchased a TECO vfd and 3phase motor from Dealer's. Works great. Great customer service.
witch motor did you get.I would like to get tha manuel for the VFD
I just purchased a TECO vfd and 3phase motor from Dealer's. Works great. Great customer service.
witch motor did you get.I would like to get tha manuel for the VFD
You don't want to let a CT go open circuit, imagine one on a 120KV transmission line open circuit, not only magic smoke but magic arcs.
Ray, come back! You need to tell us that CT stands for conspiracy theory, then we can all go back to machining.I agree that you don't want to let a CT go open but the voltage it will develop should you do so will depend only on the voltage drop across the very small impedence of the one-turn primary. This voltage will be proportional to the primary current. The voltage level of the primary with respect to ground is irrelevant. With the secondary open the core will saturate and start heating up if the primary current is high enough.
Ray, come back! You need to tell us that CT stands for conspiracy theory, then we can all go back to machining.
(Many, many years ago I used to work on power station and substation design. I thought enough about current transformers then to last me a lifetime, it was boring.)
I just purchased a TECO vfd and 3phase motor from Dealer's. Works great. Great customer service.
Todd, the meter is reading both legs -I can guarantee that. What comes in for residential power is two hot wires and a ground/neutral (see note). The two hot wires are 180 degrees out of phase. If you touch the two hot wires together you better be wearing your welding helmet.
A properly functioning meter will read the current through both legs and keep track of power used. We have the new meters in our area that automatically send the usage data to the electric company. The new meters are smart. They even watch the ground for excess voltage. They also monitor balance. If it detects issues, we get a call or letter from the power company. I got a letter indicating a possible balance issue. If they can tell me that, I know for sure they're reading both legs. I can also login to my account and it shows the power usage on an hourly basis (and I'm not really crazy that they collect such information about me).
Ray
NOTE: Please, let's not re-start the discussion about ground vs neutral at the service entrance panel.