AS/NZS TR IEC 61000.3.7:2012
Electromagnetic compatibility (EMC) - Part 3.7: Limits - Assessment of emission limits for the connection of fluctuating installations to MV, HV and EHV power systems
Provides guidance on principles which can be used as the basis for determining the requirements for the connection of fluctuating installations to MV, HV and EHV public power systems. Identical to and reproduced from IEC TR 61000-3-7, Ed.2.0 (2008).
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AS/NZS TR IEC 61000.3.7:2012
Committee EL-034:
Keeping Standards up-to-date
COPYRIGHT
PREFACE
CONTENTS
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Basic EMC concepts related to voltage fluctuations
5 General principles
6 General guidelines for the assessment of emission levels
7 General summation law
8 Emission limits for fluctuating installations connected to MV systems
9 Emission limits for fluctuating installations connected to HV or EHV systems
10 Rapid voltage changes
Annex A (informative) Pst = 1 curves and numerical data for 230 V and 120 V applications
Annex B (informative) Guidelines on the assessment of flicker transfer coefficient
Annex C (informative) Example of reallocation of global contributionsand planning levels considering transfer coefficients
C.1 Including transfer coefficients in the allocation procedure
C.2 Using transfer coefficients to recover and re-allocate unused emissioncontributions
C.3 Re-allocating unused emission contributions between voltage levels
Annex D (informative) The use of the severity indicators Ast and Alt to simplify calculations
Annex E (informative) Pre-connection and post-connection assessment of emission for Pst
E.1 Simplified pre-connection assessments for common periodic andaperiodic fluctuations
E.2 Pre-assessment of the connection in case of AC or DC arc furnaces withor without SVC (Static Var Compensator)
E.3 Post-connection assessment of a fluctuating installation
Annex F(informative)Addition of Pst from different busbars
Annex G (informative) Examples of case studies
G.1 Rolling mill load
G.2 Multiple spot welder load
G.3 Car shredder load
G.4 Study of proposed multiple mine winder load
G.5 Connection of a 60 ton a.c. arc furnace
Annex H (informative) List of symbols and subscripts
H.1 Letter symbols
H.2 List of subscripts
H.3 List of principal symbols
Bibliography
Figure
Figure 1 – Illustration of basic voltage quality concepts with time/location statistics covering the whole system
Figure 2 – Illustration of basic voltage quality concepts with timestatistics relevant to one site within the whole system
Figure 3 – Example of a system for sharing global contributions at MV
Figure 4 – Diagram of evaluation procedure
Figure 5 – Determination of St for a simple HV or EHV system
Figure 6 – Determination of St for a meshed HV or EHV system
Figure 7 – Equivalent circuit and vector diagram for simple assessments
Figure 8 – Example rapid voltage change associated with motor starting
Figure 9 – Example rapid voltage change associated with capacitor switching
Figure A.1 – Pst = 1 curve for regular rectangular voltage changes [13]
Figure E.1 – Shape factor curve for pulse and ramp changes
Figure E.2 – Shape factor curves for double-step and double-ramp changes
Figure E.3 – Shape factor curves for sinusoidal and triangular changes
Figure E.4 – Shape factor curves for aperiodic changes
Figure E.5 – Accounting for network loading
Figure E.6 – System for flicker emission assessment
Figure E.7 – Assessment of emission level using current measurements
Figure F.1 – Example of two loads fed from different busbars
Figure G.1 – Example of effect from a rolling mill
Figure G.2 – Example of effect of multiple spot welder load
Figure G.3 – Example profile of winder reactive power levels
Figure G.4 – Normal system configuration
Figure G.5 – Busbars coupled
Figure G.6 – "n-1" system configuration
Figure G.7 – Operation without SVC
Table
Table 1 – Compatibility levels for flicker in low voltage systemsreproduced from IEC 61000-2-2
Table 2 – Indicative values of planning levels for flickerin MV, HV and EHV power systems
Table 3 – Stage 1 limits for the relative changes in poweras a function of the number of changes per minute
Table 4 – Minimum emission limits at MV
Table 5 – Minimum emission limits at HV-EHV
Table 6 – Indicative planning levels for rapid voltage changesas a function of the number of such changes in a given period
Table A.1 – Input relative voltage fluctuation ΔV/V for Pst=1,0 at output [13]
Table B.1 – Example of flicker transfer coefficients
Table D.1 – Compatibility levels for Ast and Altin LV and MV power systems
Table D.2 – Indicative values of planning levels for Astand Alt in MV, HV and EHV power systems
Table G.1 – Flicker measurements for example G.3, flicker effects, normal operation
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AS/NZS TR IEC 61000.3.7:2012
Committee EL-034:
Keeping Standards up-to-date
COPYRIGHT
PREFACE
CONTENTS
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Basic EMC concepts related to voltage fluctuations
5 General principles
6 General guidelines for the assessment of emission levels
7 General summation law
8 Emission limits for fluctuating installations connected to MV systems
9 Emission limits for fluctuating installations connected to HV or EHV systems
10 Rapid voltage changes
Annex A (informative) Pst = 1 curves and numerical data for 230 V and 120 V applications
Annex B (informative) Guidelines on the assessment of flicker transfer coefficient
Annex C (informative) Example of reallocation of global contributionsand planning levels considering transfer coefficients
C.1 Including transfer coefficients in the allocation procedure
C.2 Using transfer coefficients to recover and re-allocate unused emissioncontributions
C.3 Re-allocating unused emission contributions between voltage levels
Annex D (informative) The use of the severity indicators Ast and Alt to simplify calculations
Annex E (informative) Pre-connection and post-connection assessment of emission for Pst
E.1 Simplified pre-connection assessments for common periodic andaperiodic fluctuations
E.2 Pre-assessment of the connection in case of AC or DC arc furnaces withor without SVC (Static Var Compensator)
E.3 Post-connection assessment of a fluctuating installation
Annex F(informative)Addition of Pst from different busbars
Annex G (informative) Examples of case studies
G.1 Rolling mill load
G.2 Multiple spot welder load
G.3 Car shredder load
G.4 Study of proposed multiple mine winder load
G.5 Connection of a 60 ton a.c. arc furnace
Annex H (informative) List of symbols and subscripts
H.1 Letter symbols
H.2 List of subscripts
H.3 List of principal symbols
Bibliography
Figure
Figure 1 – Illustration of basic voltage quality concepts with time/location statistics covering the whole system
Figure 2 – Illustration of basic voltage quality concepts with timestatistics relevant to one site within the whole system
Figure 3 – Example of a system for sharing global contributions at MV
Figure 4 – Diagram of evaluation procedure
Figure 5 – Determination of St for a simple HV or EHV system
Figure 6 – Determination of St for a meshed HV or EHV system
Figure 7 – Equivalent circuit and vector diagram for simple assessments
Figure 8 – Example rapid voltage change associated with motor starting
Figure 9 – Example rapid voltage change associated with capacitor switching
Figure A.1 – Pst = 1 curve for regular rectangular voltage changes [13]
Figure E.1 – Shape factor curve for pulse and ramp changes
Figure E.2 – Shape factor curves for double-step and double-ramp changes
Figure E.3 – Shape factor curves for sinusoidal and triangular changes
Figure E.4 – Shape factor curves for aperiodic changes
Figure E.5 – Accounting for network loading
Figure E.6 – System for flicker emission assessment
Figure E.7 – Assessment of emission level using current measurements
Figure F.1 – Example of two loads fed from different busbars
Figure G.1 – Example of effect from a rolling mill
Figure G.2 – Example of effect of multiple spot welder load
Figure G.3 – Example profile of winder reactive power levels
Figure G.4 – Normal system configuration
Figure G.5 – Busbars coupled
Figure G.6 – "n-1" system configuration
Figure G.7 – Operation without SVC
Table
Table 1 – Compatibility levels for flicker in low voltage systemsreproduced from IEC 61000-2-2
Table 2 – Indicative values of planning levels for flickerin MV, HV and EHV power systems
Table 3 – Stage 1 limits for the relative changes in poweras a function of the number of changes per minute
Table 4 – Minimum emission limits at MV
Table 5 – Minimum emission limits at HV-EHV
Table 6 – Indicative planning levels for rapid voltage changesas a function of the number of such changes in a given period
Table A.1 – Input relative voltage fluctuation ΔV/V for Pst=1,0 at output [13]
Table B.1 – Example of flicker transfer coefficients
Table D.1 – Compatibility levels for Ast and Altin LV and MV power systems
Table D.2 – Indicative values of planning levels for Astand Alt in MV, HV and EHV power systems
Table G.1 – Flicker measurements for example G.3, flicker effects, normal operation
Previous versions
AS/NZS TR IEC 61000.3.7:2012
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.