ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 2-12: ENVIRONMENT - COMPATIBILITY LEVELS FOR LOW-FREQUENCY CONDUCTED DISTURBANCES AND SIGNALLING IN PUBLIC MEDIUM-VOLTAGE POWER SUPPLY SYSTEMS
International Electrotechnical Committee
FOREWORD
INTRODUCTION
1 Scope and object
2 Normative references
3 Terms and definitions
3.1 General definitions
3.2 Phenomena related definitions
4 Compatibility levels
4.1 General comment
4.2 Voltage fluctuations and flicker
4.3 Harmonics
4.4 Interharmonics and voltage components at frequencies
above that of the 50th harmonic
4.5 Voltage dips and short supply interruptions
4.6 Voltage unbalance
4.7 Transient overvoltages
4.8 Temporary power frequency variation
4.9 DC component
4.10 Mains signalling
Annex A (informative) The function of compatibility levels and
planning levels in EMC
A.1 The need for compatibility levels
A.2 Relation between compatibility level and immunity levels
A.3 Relation between compatibility level and emission limits
A.4 Planning levels
A.5 Illustration of compatibility, emission, immunity and
planning levels
Annex B (informative) Discussion of some disturbance phenomena
B.1 Resolution of non-sinusoidal voltages and currents
B.2 Interharmonics and voltage components at frequencies
above that of the 50th harmonic
B.3 Voltage dips and short supply interruptions
B.4 Transient overvoltages
B.5 DC component
Bibliography
Defines conducted disturbances in the frequency range from 0 kHz to 9 kHz, with an extension up to 148,5 kHz specifically for mains signalling systems. Compatibility levels are specified for electromagnetic disturbances of the types which can be expected in public medium voltage power supply systems.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 77 |
