I.S. EN 61334-3-21:1999

Introduction
1 Scope and object
2 Normative references
3 Definitions
    3.1 MV phase-to-phase capacitive coupling method
    3.2 Coupling device
    3.3 Terms concerning coupling devices
4 Services conditions
    4.1 Standard conditions
    4.2 Ambient temperature
    4.3 Power frequency
    4.4 Operating voltages
5 General requirements
    5.1 Safety and protection requirements
    5.2 Insulation requirements
    5.3 Carrier-frequency requirements
    5.4 Rating plate
    5.5 Tests
Figures
1 MV phase-to-phase isolated coupling device
2 Main components of a MV phase-to-phase isolated
    coupling device
3 Power-frequency test
4 Common-mode impulse voltage test
5 Differential mode impulse voltage test
6 Measurement of composite loss
7 Measurement of return loss
8 Measurement of the nominal coupling-side impedance
9 Measurement of the nominal equipment-side
    impedance
10 Measurement of the 3 dB bandwidth
Annex
ZA (normative) Normative references to international
    publications with their corresponding European
    publications

Establishes definitions, requirements, methods of testing and rated values for phase-to-phase isolated capacitive coupling devices to be used in medium-voltage (MV) distribution line carrier systems.