Flicker Task Force
Committee Meeting
IEEE Winter Power
Meeting
1/30/2001
The meeting began with a welcome and introduction given by Larry Conrad. The attendees then introduced themselves. Minutes from the last meeting held 00/00/00 were reviewed and after adding an amendment about the need to place limits on small consumer product loads, the minutes were approved. The minutes will be posted on the website.
61000-4-15
Defines specifications for flicker meter, does not set limits. Sent out CD to group and the national committee for comments. Several countries failed to submit comments. Substantial changes were made. Sweden wanted a better description of DV/V (comments are posted on the working group website). There also has been a figure added to document as informative annex B. The C.D.V. is now being circulated for review. It is hoped it will be ready for F Dis by mid year. There is a subtle change in the IEC flickermeter block diagram between 50 Hz. and 60 Hz. in the weighting filter.
61000-3-3
This is a new standard. This has not been printed yet. This standard will provide limits for inrush current and voltage flicker for devices under 16 amps at 230V. This standard does include an outclause to 61000-3-11 (devices 75 amps or less) if 61000-3-3 cannot be met. 61000-3-3 and 61000-3-11 will be posted on the web site. F Dis is on the web site.
P 1547 Issues:
Standard for distributed generation. This standard uses Pst limitation for flicker & maximum DV of 6% and automatic acceptance. The group proposed waiting to see how the latest draft looks. Draft 6 is on the website. However, not all of the comments have been added (work in progress). The group will be meeting the week of February 5, 2001 to revise according to Bill Feero who is on the committee. There has been a revision to the 120 V table.
Olof Magnusfsson presented a paper written by P. Hessling that reviewed the propagation and summation of flicker. The author suggested using a quadratic summation of Pst to more accurately measure flicker.
The location for the flicker tutorial has changed due to the response for the program. Everything is set for the presentation. A formal statement expressing appreciation to Mark Halpin for his leadership in putting together the tutorial was requested. The motion was made and approved. A comment was made that the tutorial may lead to a future information annex.
The form ballot committee (based on IEEE actions) has been delayed approximately six months.
Larry Conrad requested help in writing a new standard. James Wikston has already written a piece. Tom Key stated that Donnie Nastasi has been doing some similar work and would be a good candidate to help. Additional discussion followed concerning the growing use of LED bulbs and a need for additional testing.
Updated Action Item List:
Discussion was held concerning including the flicker tutorial at the summer power meeting and possibly the T&D exposition. J.J. Burke was going to investigate.
Additional discussion of 1547 suggested there are plans to pass a standard of 0.9 for Pst for medium systems. Review with the editing committee for information. Tom Basso about comments to 1547 committee. Discussion about the wording of the statement followed.
Comments regarding draft 2 need to be sent to Larry Conrad and Donnie Natasi.
Group discussion was held concerning a program written by Dr. William Mombauer. Dr. Mombauer’s program allows the user to input voltage changes with respect to time and obtain a Pst estimation for that period. Dr. Mombauer has agreed for the program to be distributed free of charge and it will be posted on the web site. Further discussion was held concerning development of a spreadsheet to predict Pst using Dr. Mombauer’s program.
Bounced emails were reviewed and a consensus for deleting them was reached.
Larry Conrad asked for success reports or discussion of problems encountered using Pst measurements. James Wikston reported data from a city where Pst was measured at 1.2 without any complaints. Michael Meyer from Virginia Power reported a case at a 230kV PCC. Pst levels of 0.8 were measured at the distribution level with no complaints. Larry Conrad discussed estimated flicker “zone of influence”. No one reported experience with Pst levels of 0.65 or below 0.70 causing customer complaints. It was agreed that Pst levels of 1.0 99% of the time was a good measuring point.
61000-3-7 Report:
61000-4-15 and 610003-7 could satisfy PAR by their adoption. Mark Mcgranaghan felt 61000-3-7 & 610003-6 are complicated but it would be good if they could be used. Larry Conrad proposed an action item to simplify (revise) 61000-3-7.