IEEE PES Working Group
P1433 Power Quality Definitions

Philip P. Barker, Co-Chair,,
518/395-5078 tel, 518/346-2777 fax

Timothy D. Unruh, Co-Chair,,
517/768-2033 tel, 517/768-2072 fax

1995 Summer Power Meeting Working Group Minutes

Portland, OR July 25, 1995

Meeting Chair: Timothy Unruh
Acting Secretary: Philip Barker


To produce a glossary of PQ Terminology (a Standard similar to Standard 100); common set of definitions describing various types of PQ disturbance and phenomena which occur. PQ Definitions are those terms and descriptions which describe variations in the power supply, as well as the cause and effects of these variations. Chapter 1: descriptions, Chapter 2: phenomena.

Starting Point:

P-1159 definitions will be the starting point of the group's effort. Later, P-1433 will create an ongoing support network. Two needs remain from P-1159: reliability and distribution (in addition, NEMA should be included).


Need exists to coordinate with other groups: SCC-10 and IEEE Editorial (Steve Huffman), P-1159 (Larry Ray), Standard 1100 (Emerald Book, Steve McCleur), IEEE 519 and 519A (Tom Gentile), Orange Book (No one assigned), P-1346 (Van Wagner), C62 (Surge Protective Devices Committee, Phil Barker), P-1250 and P-1366 (Cheri Warren), CIGRE/CIRED (Erich Gunther), NEMA (Larry Morgan), IES and Communications Society (No one assigned), Industry Applications Society/NESC (No one assigned).

Discussion (comments made at meeting):

Discussion to define what is included in a PQ Definition: i.e., shield, shielding (wiring & grounding issue?). Discussion about how to limit scope: don't get into characterization (you could quantify a sag with magnitude and duration). Suggestion that definitions/characterization (how to interpret a set of digitized points) needs to be concrete/specific/usable. Need mathematical terms/methods (which are not in the European standards) to interpret set of points. Duration (1 minute, 5 minutes) can be contentious issue, might approach as engineering (not political) issue. From interruption and sag rate probabilities as a function of event voltage magnitude and duration chart: curves can be extended. Comparison of environment to machine is an important issue. General description needed with graphics. Regulators will also be using the terms that are developed. Reporting will change, only that that matters is the customer equipment in their environment. Utility and customer need to communicate on the same level. (Option to adopt IEC standards still exists.)

Future Meeting:

Objective for the Winter Meeting is to look into P-1159 as a starting point. An attempt will be made to accomplish a draft outline before the next meeting. Then discuss the outline at the next meeting.

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