Since there is still some confusion of the subject of power EMC, the following workshop may be of interest to the members of this forum.
Dave George
Unisys
_______________________________________________________________________
To All,
The second USCCEMC Harmonics Workshop will be held May 6th and 7th at the
BWI
Sheraton Hotel. A draft agenda follows below.
The general focus of the second workshop will be to fill any information
gaps
left at the end of the first workshop and to develop consensus on preferred
US
positions vis-a-vis 77A/242/NP which, as you will recall, enables work both
to
establish harmonic emission limits in North America and to revise European
emission limits in the context of IEC 61000-3-2. Key to meeting this second
objective is developing US positions on the various technical and economic
issues as well as measurement methods, specification of limits, scope of
applicability, etc. US positions will need to be firmly based on objective
supporting documentation, the development of which will require active and
ongoing participation by workshop attendees. To these ends, we expect to
have
some number of focused presentations interspersed with discussions and
breakouts to assist in formulating US positions and for identifying and/or
developing supporting documents.
As with the first workshop, the agenda is tentative at this point in time
and
open to modification based on feedback from those of you on this
distribution.
Following the draft agenda, you will find the text of Don Heirman's report
to
the USNC Executive Committee on the outcome of the first workshop. Don
plans
to report to workshop attendees on the USNC Exco reaction to this report.
A registration form is attached also. We strongly encourage you to register
as
soon as possible as this will greatly assist planning efforts.
For Don Heirman, Ralph Showers, and the USCCEMC,
Jim McKim
****************************************************************************
***
HARMONICS WORKSHOP
(Continuation)
6,7 May, 1999
SHERATON HOTEL, BWI
6 May
Session 1 - Summary and update on Workshop 28, 29 January
8:00 - 8:15 1A Introduction - Heirman, Showers, McKim
i) Background
ii) Summary of 28, 29 January workshop
iii) USNC Exco Reaction to Jan 28,29 Workshop - Heirman
iv) Work in progress in SC77A/WG1
v) Current Objectives
Session 2 - Power Harmonics Models
8:15 - 9:00 2A - General - Mansoor & McKim
9:00 - 9:45 2B - Environmental considerations, total energy efficiency, &
costs - Conrad, Mansoor
i) industrial environments
11) residential/rural environmants
9:45 - 10:15 Break
10:15 - 10:45 2C Summary of Economics of Competing Mitigation Techniques -
TBD
10:45 - 12:00 2D Discussion
12:00 - 1:15 Lunch
Session 3 - Application of Limits and Test Methodology
1:15 - 2:00 3A Application of Limits - Philips, Yandek, Conrad
i) Significant contributors only? (to
be identified)
ii) control by class?
iii) Equal Rights Philosophy?
iv) >16A?
2:00 - 2:45 3B Testing & Test Techniques - McKim, Soldner
i) IEC Test Methods - McKim
ii) Only at 100% of rated load
iii) Control by PF measurement only?
iv) Highest harmonic order to be protected
2:45 - 3:00 3C Discussion
3:00 - 3;30 Break
3:30 - 5:00 Discussion and task group break-out activities
7 May
Session 4 - Integration and Implementation
8:00 - 8:45 4A Justification for Regional Differences - Conrad
i) Power Quality, in general
ii) 3rd harmonic issue in N.A.
8:45 - 9:00 4B Implementation - R. Gardinier
i) Applicable to new designs only
ii) Voluntary vs. regulatory approaches
iii) Adequacy of IEEE 519 vs. IEC 61000-3-2
iv) Dependence on load power consumption
9:30 - 10:00 Discussion
10:00 - 10:30 Break
10:30 - 11:00 4C Status of Measurement program - Calcavecchio
i) Implementation
ii) Interpretation of data
11:00 - 12:00 Discussion
12:00 - 1:15 Lunch
Session 5 Strategy and Tactics
1:15 - 1:45 5A Statement of Consolidated Objectives - G. Zeidensbergs
1:45 - 2:15 5B Organizing Support - J. Kinn
2:15 - 3:00 5C General discussion and conclusions
****************************************************************************
*
Summary of Actions at USCCEMC Harmonics Workshop
>BWI Airport Sheraton Hotel - Jan 28-29, 1999
>
>Next Meeting:
>
>BWI Airport Sheraton Hotel - May 6-7, 1999
>
>Total Attendees: 80
>
>IEC/USNC Management:
>
>Don Heirman - USCCEMC Chairman
>Ralph Showers - Technical Advisor SC77A, ACEC
>Ralph Calcavecchio - CISPR G Chairman, ACEC
>Allen Ludbrook - IEEE 519A Co-Chairman
>
>Utility Representatives:
>
>Larry Conrad - Cinergy Corp.
>Frank Sinacola - ConED
>Arshad Mansoor - PEAC/EPRI
>
>Remaining 77 attendees:
>
>Centralized Mitigation Companies - 6
>Test Houses - 3
>Equipment Manufacturers - 68
>
>Organizations Represented - NEMA, EIA, TIA, UL, CEMA, TC34
>
>A total of 24 presentations were given representing a wide range of
>perspectives and interests. Following these presentations and ensuing
>discussion sessions, the following tentative conclusions were reached:
>
>1. The guiding principle for any regulation of harmonic emissions from
>products connected to public mains distribution systems should be "minimum
>total cost to society". Mandatory emission limits should only follow from
a
>clear demonstration of need.
>
>2. Harmonic emissions from large point source loads must be controlled.
IEEE
>519 is an appropriate vehicle for achieving this regulation.
>
>3. Harmonic emissions from concentrations of small loads (e.g. ITE in
>commercial office buildings) do not represent a significant impact at the
PCC
>and are best dealt with by use of centralized mitigation techniques such as
>filters, over-sized neutral conductors, K-rated transformers, etc.
Building
>designers, planners, etc. should be better educated to pro-actively manage
>intra-site non-linear loads.
>
>4. Harmonic emissions from distributed small loads do not presently
represent
>a significant impact on public mains systems, but may have a consequential
>impact in the future if current trends towards increasing conversion of
>linear-type loads to non-linear-type loads continues. Cited examples of
>potentially problematic loads include small ASD's in appliances and home
HVAC
>systems, phase-controlled electric ranges, electric vehicle battery
charging
>systems, etc.
>
>5. Harmonic emissions from distributed small loads should be addressed
>selectively on an as-needed basis. Load size, proliferation, and emission
>characteristics should be considered. For example: television receivers,
home
>PC's, CFL's, etc. are thought to be unlikely candidates for causing
significant
>impact on mains systems even at high saturation levels in residences.
Electric
>vehicle battery charging systems, phase-controlled electric cooking ranges,
>ASD-based refrigeration and air-conditioning, etc. may require targeted
>emission limits.
>
>6. High volume single phase products below XXX Watts of input power
should be
>exempted from emission limits. The target threshold for exemption is in
the
>range of 200-600 Watts.
>
>7. Low volume single phase products, regardless of power, should be
exempted
>from mandatory emission limits.
>
>8. "Professional" single phase products should be exempted from mandatory
>emission limits.
>
>9. Satisfactory limitation of emissions from higher power balanced three
phase
>products with 6 pulse rectifiers may be obtained from inclusion of 3%
>inductors. Such inductors may be installed either on the mains side or on
the
>DC-link side of the rectifier. Inclusion of inductors or equivalent
mitigation
>means should be mandatory.
>
>10. Mains emission models presently used to justify emission limits are
>inadequate.
>
>11. Satisfactory emissions performance may be confirmed by means of power
>factor measurement.
>
_______________________________________________________________________
-----Original Message-----
From: POWELL, DOUG [mailto:doug.pow...@aei.com]
Sent: Tuesday, March 30, 1999 2:38 PM
To: emc-p...@majordomo.ieee.org
Subject: IEC 61000-3-2 Update
Hello all,
I was just reviewing my copy of the Conformity (TM) magazine in the
standards update section. Apparently IEC 61000-3-2 is be circulated for
voting and comment. On bothersome point in the article is that "The
proposed amendment would add a new class of devices ... with input power
exceeding 1 kW for single phase and 3 kW for 3-phase equipment".
I thought that IEC 61000-3-2 was for equipment with line currents <= 16A and
IEC 61000-3-4 is for > 16 A. Am I missing something here? It seems that
the -2 document is expanding to cover high power equipment as well. Is it
possible to get a copy of the draft amendment and make comments?
-doug
=======================================
Douglas E. Powell, Compliance Engineer
Advanced Energy Industries, Inc.
Fort Collins, Colorado USA
970-407-6410 (phone)
970-407-5410 (fax)
doug.pow...@aei.com
www.advanced-energy.com
=======================================
2 Harmonics Reg Form.doc
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