IEC 60358-1:2012 pdf Coupling capacitors and capacitor dividers – Part 1: General rules

IEC 60358-1:2012 pdf Coupling capacitors and capacitor dividers – Part 1: General rules
1 Scope
This part of IEC 60358 applies to:
• Capacitors, with rated voltage > 1 000 V, connected line to ground with the low voltage
terminal either permanently earthed or connected to devices, for applications listed
hereunder and other similar uses.
This standard serves as basic standard for the coupling capacitor, the different parts of this
standard will present the supplementary specifications and tests, for example IEC 60358-2,
IEC 60358-3 or IEC 60358-4.
NOTE Diagrams of coupling capacitor to which this standard applies are given in Figures A.1 .
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
IEC 60038, IEC standard voltages
IEC 60050-321 :1 986, International Electrotechnical Vocabulary – Chapter 321: Instrument
transformers
IEC 60050-436:1 990, International Electrotechnical Vocabulary – Chapter 436: Power
capacitors
IEC 60050-601 :1 985, International Electrotechnical Vocabulary – Chapter 601: Generation,
transmission and distribution of electricity – General
IEC 60050-604:1 987, International Electrotechnical Vocabulary – Chapter 604: Generation,
transmission and distribution of electricity – Operation
IEC 60060-1 , High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60068-2-1 7, Basic environmental testing procedures – Part 2-17: Tests – Test Q: Sealing
IEC 60071 -1 , Insulation co-ordination – Part 1: Definitions, principles and rules
IEC 60270, High-voltage test techniques – Partial discharge measurements
IEC 60721 (all parts), Classification of environmental conditions
IEC 61 462, Composite hollow insulators – Pressurized and unpressurized insulators for use in
electrical equipment with rated voltage greater than 1 000 V – Definitions, test methods,
acceptance criteria and design recommendations
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE Some of these terms and definitions are identical with or are similar to those of IEC 60050-321 :1 986,IEC 60050-436:1 990, IEC 60050-601 :1 985 and IEC 60050-604:1 987. These are indicated by the relevant reference in brackets.
3.1 General terms and definitions
3.1 .1 equipment
general term used for this standard, either for complete capacitor, capacitor divider, RC-divider
3.1 .2 coupling capacitor
capacitor used for the transmission of signals in a power system
[SOURCE: IEC 60050-436:1 990, 436-02-1 1 ]
3.1 .3 rated frequency of equipment
frequency for which the coupling capacitor has been designed
3.1 .4 standard reference range of frequency
range of frequency which is applicable for the equipment.
3.1 .5 rated voltage
U R
value of the voltage which appears in the designation of the equipment and on which its
performance is based
[SOURCE: IEC 60050-321 :1 986, 321 -01 -1 2]
3.1 .6 highest voltage for equipment
U m
a.c.: the highest r.m.s. value of phase-to-phase voltage for which the equipment is designed
and may be used in respect of its insulation
d.c.: the highest value of line to ground voltage for which the equipment is designed and may
be used in respect of its insulation
3.1 .7 d.c.-system voltage
U DC
highest mean or average operating voltage to earth, excluding harmonics and commutation
overshoots
[SOURCE: IEC 60071 -5]
3.1 .8 Maximum d.c.-system voltage
U DCmax
maximum D.C.-system voltage is almost a pure d.c. voltage with a magnitude dependent on
voltage control and measuring tolerance excluding harmonics and commutation overshoots.
3.1 .9 rated insulation level
combination of voltage values which characterises the insulation of the equipment with regard
to its capability to withstand dielectric stresses
3.1 .1 0 isolated neutral system
system where the neutral point is not intentionally connected to earth, except for high
impedance connections for protection or measurement purposes
[SOURCE: IEC 60050-601 :1 985, 601 -02-24]
3.1 .1 1 solidly earthed (neutral) system
system whose neutral point(s) is (are) earthed directly
[SOURCE: IEC 60050-601 :1 985, 601 -02-25]
3.1 .1 2 impedance earthed (neutral) system
system whose neutral point(s) is (are) earthed through impedances to limit earth fault currents
[SOURCE: IEC 60050-601 :1 985, 601 -02-26]
3.1 .1 3 resonant earthed (neutral) system
system in which one or more neutral points are connected to earth through reactances which
approximately compensate the capacitive component of a single-phase-to-earth fault current
[SOURCE: IEC 60050-601 :1 985, 601 -02-27]
Note 1 to entry: With resonant earthing of a system, the residual current in the fault is limited to such an extent that an arcing fault in air is self-extinguishing.