ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 3-7: LIMITS - ASSESSMENT OF EMISSION LIMITS FOR THE CONNECTION OF FLUCTUATING INSTALLATIONS TO MV, HV AND EHV POWER SYSTEMS
International Electrotechnical Committee
FOREWORD
INTRODUCTION
ACKNOWLEDGMENT
1 Scope
2 Normative references
3 Terms and definitions
4 Basic EMC concepts related to voltage fluctuations
4.1 Compatibility levels
4.2 Planning levels
4.2.1 Indicative values of planning levels
4.2.2 Assessment procedure for evaluation against
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 flicker emission level
6.3 Assessment of flicker emission levels
6.4 Declared system short circuit power or impedance
6.4.1 Short-circuit power or impedance for
pre-connection assessment of emission
levels
6.4.2 Short-circuit power or impedance for assessing
actual emission levels
6.5 General guidelines for assessing the declared system
impedance
7 General summation law
8 Emission limits for fluctuating installations connected
to MV systems
8.1 Stage 1: simplified evaluation of disturbance
emission
8.2 Stage 2: emission limits relative to actual system
characteristics
8.2.1 Global emission to be shared between the
customers
8.2.2 Individual emission limits
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 fluctuating installations connected
to HV or EHV systems
9.1 Stage 1: simplified evaluation of disturbance emission
9.2 Stage 2: emission limits relative to actual system
characteristics
9.2.1 Assessment of the total available power
9.2.2 Individual emission limits
9.3 Stage 3: acceptance of higher emission levels on
a conditional basis
10 Rapid voltage changes
10.1 General considerations
10.2 Compatibility level
10.3 Planning levels
10.4 Emission limits
10.5 Assessment procedure for evaluation against
planning levels & emission limits
Annex A (informative) P[st] = 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
contributions and planning levels considering
transfer coefficients
Annex D (informative) The use of the severity indicators
A[st] and A[lt] to simplify calculations
Annex E (informative) Pre-connection and post-connection
assessment of emission for P[st]
Annex F (informative) Addition of P[st] from different
busbars
Annex G (informative) Examples of case studies
Annex H (informative) List of symbols and subscripts
Bibliography
Gives 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 (LV installations are covered in other IEC documents).
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 77 |
| Supersedes |
|
