Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Register Log in
  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

VSDs stoppage after supply disturbance 1

Status
Not open for further replies.
SA07

SA07

Electrical
Feb 22, 2018
365
MU
Hi
Can you plz share what is done to avoid loads on VSD to stop/trip after a disturbance on the supply voltage?
We have several turbo-alternators + boilers connected to the national grid. Usually a disturbance on the grid causes VSD to stop/trip. We have set VSD with 3 restarts after fault, restart after power failure. But still sometimes we have some trips e.g on fans, coal feeders VSD. On compressors also we have this issue. Are there special VSD which can tackle this problem?
Whenever a critical VSD stops, the whole plant will stop. Thks

 
Replies continue below

Recommended for you

Sort by date Sort by votes
VSDs do come with 'Voltage dip ride-through' and 'flying start' functions.
It may just be a matter of enabling and setting the already-available feature in the VSD.
Capture the voltage disturbance plot and discuss with the VSD vendor.
 
Upvote 0 Downvote
What sort of "disturbance"??

How big is the volt drop / frequency dip / seconds of lost power?

Is it the VFD or the switchboard itself which drops out the incomers?

There are some which no system can withstand.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
Upvote 0 Downvote
First you must define "disturbances". Over voltage swells? Under voltage sags? Total power losses? Brief power losses, as in 2 seconds or under? What you are seeing determines how you approach a solution.



" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
 
Upvote 0 Downvote
The plot shows voltage dip was only for 100ms at the upstream 66kV bus due to an earth of fault in Blue phase.
It can be solved by enabling/setting the voltage dip ride-through feature in VSDs. As I mentioned in my previous post, approach VSD vendors with the details for support.
 
Upvote 0 Downvote
Not all VFDs offer that feature though, so it will depend on the brand and model.


" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

kingbambina
  • Question
Solenoid Valve Actuator DC Supply
Replies
1
Views
826
waross
waross
123MB
  • Locked
  • Question
Burst Firing for an AC Voltage Controller - What is the supply current rating?
Replies
8
Views
162
waross
waross
tintin75
  • Locked
  • Question
Field wiring bypassing terminal blocks after incident ( Industrial Board in EU)
Replies
3
Views
91
FacEngrPE
FacEngrPE
Uralsk
  • Locked
  • Question
using 250 ampere welding machine for medium scale carbon arc furnace power supply? 3
Replies
11
Views
103
TugboatEng
TugboatEng
SA07
  • Locked
  • Question
Advice whether to buy spare parts or new spare transformer 55 MVA after 17 years
Replies
4
Views
47
SA07
SA07

Part and Inventory Search

Sponsor

Back
Top Bottom