IEC 61642:1997

Foreword
Clause
1. General
    1.1 Scope and object
    1.2 Normative references
    1.3 Definitions
    1.4 General considerations
         1.4.1 AC harmonics
         1.4.2 Reactive power
2. Resonance problems and solutions
    2.1 Introduction
    2.2 Supply impedance view, load-busbar impedance view
    2.3 Example of series resonance
    2.4 Example of parallel resonance
    2.5 Solutions to avoid resonances
         2.5 1 Capacitor-reactor connection: series
                resonance
         2.5.2 Capacitor-reactor connection: parallel
                resonance
3. Shunt capacitors and filters for networks having a
    voltage up to and including 1 000 V
    3.1 Introduction
    3.2 Shunt capacitors
    3.3 Detuned filter
    3.4 Tuned filter
    3.5 Components selection
         3.5.1 Capacitors
         3.5.2 Reactors
         3.5.3 Contactors and/or circuit-breakers
         3.5.4 Short-circuit protection (fuses)
    3.6 Disturbance of ripple control installations by
         shunt capacitors and filters
         3.6.1 Shunt capacitors
         3.6.2 Detuned filter
         3.6.3 Tuned filter
4. Shunt capacitors and filters for networks having a
    voltage above 1 000 V
    4.1 Introduction
    4.2 Specific requirements
    4.3 Choice of power factor correction installation
    4.4 Type of filters
    4.5 Filter components selection
         4.5.1 Circuit-breaker
         4.5.2 Capacitors
         4.5.3 Reactors
         4.5.4 Resistors
         4.5.5 Relay protection
    4.6 Disturbance of ripple control installations by
         shunt capacitors and filters
Annex A - Bibliography

Gives guidance for the use of passive a.c. harmonic filters and shunt capacitors for the limitation of harmonics and power factor correction intended to be used in industrial applications, at low and high voltages. The measures proposed in this standard are applicable to harmonic orders greater than 1 and up to and including 25.