IET logo
 
IET
Decrease font size
Increase font size
Topic Title: Unexpected dimming of lights.
Topic Summary: Why is it happening when the load is removed?
Created On: 22 September 2017 09:43 AM
Status: Read Only
Linear : Threading : Single : Branch
 Unexpected dimming of lights.   - potential - 22 September 2017 09:43 AM  
 Unexpected dimming of lights.   - kellyselectric - 22 September 2017 12:14 PM  
 Unexpected dimming of lights.   - nad - 22 September 2017 01:00 PM  
 Unexpected dimming of lights.   - mapj1 - 23 September 2017 12:15 AM  
 Unexpected dimming of lights.   - potential - 23 September 2017 10:16 AM  
 Unexpected dimming of lights.   - mapj1 - 23 September 2017 12:32 PM  
 Unexpected dimming of lights.   - OlympusMons - 24 September 2017 02:12 PM  
 Unexpected dimming of lights.   - potential - 24 September 2017 05:41 PM  
 Unexpected dimming of lights.   - potential - 24 September 2017 05:44 PM  
 Unexpected dimming of lights.   - MWalker86 - 24 September 2017 11:10 PM  
 Unexpected dimming of lights.   - kellyselectric - 26 September 2017 12:48 PM  
 Unexpected dimming of lights.   - kellyselectric - 05 October 2017 11:12 AM  
 Unexpected dimming of lights.   - alancapon - 24 September 2017 06:11 PM  
 Unexpected dimming of lights.   - kellyselectric - 24 September 2017 07:52 PM  
 Unexpected dimming of lights.   - potential - 05 October 2017 01:57 PM  
 Unexpected dimming of lights.   - potential - 05 October 2017 02:01 PM  
 Unexpected dimming of lights.   - kellyselectric - 05 October 2017 04:41 PM  
Search Topic Search Topic
Topic Tools Topic Tools
View similar topics View similar topics
View topic in raw text format. Print this topic.
 23 September 2017 12:32 PM
User is offline View Users Profile Print this message



mapj1

Posts: 9356
Joined: 22 July 2004

Odd.
Well assuming you don't have some sort of tap changing voltage optimiser in the meter cupboard, or its modern equivalent you have forgotten about, if yourealy want to know, then it is probably time to organise some sort of logging, either a scope with storage, or as I alluded earlier I have mis-used a computer sound card as to capture transients in conjunction with an old fashioned bell transformer to isolate and reduce the voltage.
I presume you or your same phase neighbours don't have an local generation, such as solar panels or wind, that might be fooled into pushing harder when seeing a lower impedance load, and then overrunning for a short time after its removal, and that the DNO have not got some clever voltage lift compensator at the substation. The fact it does not happen with an extra 30m of 4mm is odd - I make that only adding the odd tenth of ohm or so. Do lights at the house end on both CUs do this ? - if so the cause may be external. Also how much wire is common between supplies to one CU to the next - and I'm assuming its not split phase so one goes up as the other down.

-------------------------
regards Mike
Statistics

New here?


See Also:



FuseTalk Standard Edition v3.2 - © 1999-2017 FuseTalk Inc. All rights reserved.

..