AS/NZS TR IEC 61000.3.13:2012
Electromagnetic compatibility (EMC) - Part 3.13: Limits - Assessment of emission limits for the connection of unbalanced installations to MV, HV and EHV power systems
Provides guidance on principles that can be used to determine the requirements for the connection of three-phase installations causing voltage unbalance to MV, HV and EHV public power systems. Identical to and reproduced from IEC/TR 61000-3-13, Ed 1.0 (2008).
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AS/NZS TR IEC 61000.3.13:2012
COPYRIGHT
PREFACE
CONTENTS
1 Scope
2 Normative references
3 Terms and definitions
4 Basic EMC concepts related to voltage unbalance
4.1 Compatibility levels
4.2 Planning levels
4.3 Illustration of EMC concepts
4.4 Emission levels
5 General principles
5.1 Stage 1: simplified evaluation of disturbance emission
5.2 Stage 2: emission limits relative to actual system characteristics
5.3 Stage 3: acceptance of higher emission levels on a conditional basis
5.4 Responsibilities
6 General guidelines for the assessment of emission levels
6.1 Point of evaluation
6.2 Definition of unbalance emission level
6.3 Assessment of emission levels from unbalanced installations
7 General summation law
8 Emission limits for unbalanced installations in MV systems
8.1 Stage 1: simplified evaluation of disturbance emission
8.2 Stage 2: emission limits relative to actual system characteristics
8.3 Stage 3: acceptance of higher emission levels on a conditional basis
8.4 Summary diagram of the evaluation procedure
9 Emission limits for unbalanced installations in HV or EHV systems
9.1 Stage 1: simplified evaluation of disturbance emission
9.2 Stage 2: emission limits relative to actual system characteristics
9.3 Stage 3: acceptance of higher emission levels on a conditional basis
Annex
Annex A (informative) Guidance for setting planning levels and emission limits
A.1 Sources of unbalance
A.2 Share of unbalance between system and unbalanced installations
A.3 Summation of sources of unbalance
A.4 Transfer coefficient
A.5 Sharing of planning levels for setting emission limits
Annex B (informative) Calculation examples for determining emission limits
Annex C (informative) List of principal letter symbols, subscripts and symbols
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 time statisticsrelevant to one site within the whole system.
Figure 3 – Illustration of the emission vector U2i/U1 and its contribution to the measuredunbalance at the point of evaluation
Figure 4 – Example of a system for sharing global contribution at MV
Figure 5 – Diagram of evaluation procedure
Figure 6 – Determination of St for a simple HV or EHV system
Figure 7 – Determination of St for a meshed HV or EHV system
Figure A.1 – The reduction factor TuML as a function of the factors km, ks, and ksc
Figure A.2 – Example of unbalance ratio measurementfor a remote mine with largely motor loading
Table
Table 1 – Compatibility levels for voltage unbalance in low and mediumvoltage systems reproduced from references IEC 61000-2-2 and IEC 61000-2-12
Table 2 – Indicative values of planning levels for voltage unbalance(negative-sequence component) in MV, HV and EHV power systems
Table 3 – Indicative value of exponentfor the summation of general unbalanced installations
Table A.1 – Portion of unbalance for accounting for the system inherent asymmetries
Table A.2 – Summation of unbalance from different sources
Table A.3 – Range of values of planning levels given different parameters
Bibliography
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AS/NZS TR IEC 61000.3.13:2012
COPYRIGHT
PREFACE
CONTENTS
1 Scope
2 Normative references
3 Terms and definitions
4 Basic EMC concepts related to voltage unbalance
4.1 Compatibility levels
4.2 Planning levels
4.3 Illustration of EMC concepts
4.4 Emission levels
5 General principles
5.1 Stage 1: simplified evaluation of disturbance emission
5.2 Stage 2: emission limits relative to actual system characteristics
5.3 Stage 3: acceptance of higher emission levels on a conditional basis
5.4 Responsibilities
6 General guidelines for the assessment of emission levels
6.1 Point of evaluation
6.2 Definition of unbalance emission level
6.3 Assessment of emission levels from unbalanced installations
7 General summation law
8 Emission limits for unbalanced installations in MV systems
8.1 Stage 1: simplified evaluation of disturbance emission
8.2 Stage 2: emission limits relative to actual system characteristics
8.3 Stage 3: acceptance of higher emission levels on a conditional basis
8.4 Summary diagram of the evaluation procedure
9 Emission limits for unbalanced installations in HV or EHV systems
9.1 Stage 1: simplified evaluation of disturbance emission
9.2 Stage 2: emission limits relative to actual system characteristics
9.3 Stage 3: acceptance of higher emission levels on a conditional basis
Annex
Annex A (informative) Guidance for setting planning levels and emission limits
A.1 Sources of unbalance
A.2 Share of unbalance between system and unbalanced installations
A.3 Summation of sources of unbalance
A.4 Transfer coefficient
A.5 Sharing of planning levels for setting emission limits
Annex B (informative) Calculation examples for determining emission limits
Annex C (informative) List of principal letter symbols, subscripts and symbols
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 time statisticsrelevant to one site within the whole system.
Figure 3 – Illustration of the emission vector U2i/U1 and its contribution to the measuredunbalance at the point of evaluation
Figure 4 – Example of a system for sharing global contribution at MV
Figure 5 – Diagram of evaluation procedure
Figure 6 – Determination of St for a simple HV or EHV system
Figure 7 – Determination of St for a meshed HV or EHV system
Figure A.1 – The reduction factor TuML as a function of the factors km, ks, and ksc
Figure A.2 – Example of unbalance ratio measurementfor a remote mine with largely motor loading
Table
Table 1 – Compatibility levels for voltage unbalance in low and mediumvoltage systems reproduced from references IEC 61000-2-2 and IEC 61000-2-12
Table 2 – Indicative values of planning levels for voltage unbalance(negative-sequence component) in MV, HV and EHV power systems
Table 3 – Indicative value of exponentfor the summation of general unbalanced installations
Table A.1 – Portion of unbalance for accounting for the system inherent asymmetries
Table A.2 – Summation of unbalance from different sources
Table A.3 – Range of values of planning levels given different parameters
Bibliography
AS/NZS TR IEC 61000.3.13:2012
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.