IEEE P1564 Task Force on Voltage Sag Indices

IEEE P1564 Task Force on Voltage Sag Indices

IEEE PES Summer Meeting

July 23, 2002 – Chicago, Ill

Meeting Minutes

Welcome and Introduction:

The meeting was called to order by Dan Sabin, acting Chair for Mike Sheehan. and Math Bollen.

Attendees were asked to introduce themselves and sign the attendance roster, making note of any changes in email addresses.

Copies of the Minutes from the January 2002 meeting in New York were distributed and approved as posted on the web.

Discussion

CIGRE Working Group – No Report
IAS – No Report
IEEE P1564 – For those who were new to the Task Force, Dan Sabin reviewed the Scope of 1564 as stated in the PAR, the project purpose and the chapter overview. He summarized Math Bolen’s report on the status of the work as follows:

Chapter 6 – Done based on IEEE P1159.1 work.
Chapter 7 – Done as far as voltage magnitude and duration. There are lots of ways of calculating these characteristics. Do we want to include all methods or chose a recommended method?
Chapter 8 – Discussion is required on SARFI and UNIPEDE
Chapter 9 – Discussion required on aggregating single site indices to create a system index. Method of determining weighting factors for single site indices is required.

The attendees were split into breakout sessions to discuss additional chapter content based on P1564 Draft 2. A summary of the reports from the breakout sessions is presented below.

Chapter 6 - Ambra Sannino: The symmetrical component method of calculating voltage sag indices is too complicated for most people to use. The magnitude of the lowest phase, should be used as the sag magnitude. The duration should be defined from the time the first phase goes below the selected threshold until the time the last phase returns above the threshold. Jim Burke stated that the method must be easy to understand and easy to use. He suggested that we should provide data to the user. Dan Sabin indicated that approximately 90% of the sags recorded in the DPQ project wer rectangular, 5-6% nonrectangular in two steps and only 3% greater than two steps.

Chapter 7 – No session

Chapter 8 – Dan Sabin will submit text for this chapter

Chapter 9 – Dave Vannoy: This chapter doesn’t need to provide a DPQ history. It was suggested that there are different weighting factors that could be used depending on the desired purpose of the index. For example, the site data might be weighted by distribution line exposure if the index is to be used to evaluate system performance, number of customers if it is desired to understand customer impact, or kVA if it is desired to examine the effect on load. A discussion of legitimate uses for the chosen index method should be provided, along with which indices are most important for comparison with other systems.

It should also be noted that SARFI can be calculated with reference to many criteria, for example, SARFI_CBEMA, SARFI_SEMI, etc. It was also suggested that the UNIPEDE table be included.

This chapter should also discuss factors to consider in selecting monitoring locations.

The group was polled regarding meeting in Las Vegas in January. The response was overwhelmingly positive.

There being no further business, the meeting was adjourned

Respectfully submitted,

Dave Vannoy, Acting Secretary for Russ Ehrlich