4160V Reduced Voltage Starter Question (run and shorting contactors are closed at the same time)

  • #1

Summary:

What happens when run and shorting contactors are closed in at the same time.

Main Question or Discussion Point

Can someone give me some insight into what would happen at the motor terminals and on the line if 2K2 (run Contactor) and 2K3 (auto xfmr wye contactor) were to close simultaneously. There are interlocks to prevent this, but I would like to know out of curiosity. My theory is that you would have reduced voltage and increase current at motor due to voltage drop and load torque demand, and a circulating current in the auto-xmfr.

thanks
 

Attachments

Answers and Replies

  • #2
Tom.G
Science Advisor
3,292
2,045
Potentially a big BANG as the relay contacts vaporize.
But that's why there are fuses in the supply lines.

If you try the experiment be sure to have something substantial between it and you, a concrete wall perhaps. If you must watch it, use a video camera that you are willing to replace.

Cheers,
Tom
 
  • Like
Likes berkeman

Related Threads on 4160V Reduced Voltage Starter Question (run and shorting contactors are closed at the same time)

Replies
3
Views
2K
  • Last Post
Replies
10
Views
3K
  • Last Post
Replies
9
Views
2K
Replies
2
Views
1K
Replies
28
Views
2K
  • Last Post
Replies
3
Views
1K
Replies
4
Views
753
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
4
Views
5K
Replies
4
Views
546
Top