IEC 60252 1 pdf download – AC motor capacitors – Part 1: General – Performance, testing and rating – Safety requirements – Guide for installation and operation
1 eneral
1.1Scope and object
This International Standard applies to motor capacitors intended for connection to windings ofasynchronous motors supplied from a single-phase system having a frequency up to andincluding 100 Hz, and to capacitors to be connected to three-phase asynchronous motors sothat these motors may be supplied from a single-phase system.
This standard covers impregnated or unimpregnated capacitors having a dielectric of paper,plastic film, or a combination of both, either metallized or with metal-foil electrodes,with ratedvoltages up to and including 66o v.
Motor start capacitors will be covered by lEC60252-2*.NOTE The following are excluded from this standard:
shunt capacitors of the self-healing type for a.c.power systems of up to and including 1 000 V nominal voltage(see lEc 60831-1);
shunt capacitors of non-self-healing type for a.c. power systems of up to and including 1 000 v nominal voltage(see lEC 6o931-1);
shunt capacitors for a.c. power systems having a nominal voltage above 1 000 v (see lEC 60871-1);
capacitors for induction heat-generating plants,operating at frequencies between 40 Hz and 24 000 Hz (seelEC 60110-1);
series capacitors (see lEC 60143);
coupling capacitors and capacitor dividers (see lEC 60358);
capacitors to be used in power electronic circuits (see IEC 61071-1);
small a.c. capacitors to be used for fluorescent and discharge lamps (see IEC 61048);capacitors for suppression of radio interference (IEC publication under consideration);
capacitors intended to be used in various types of electrical equipment and thus considered as components;capacitors intended for use with d.c. voltage superimposed on a.c. voltage.
The object of this standard is
a) to formulate uniform rules regarding performance, testing and rating;b) to formulate specific safety rules;
c) to provide a guide for installation and operation.
1.2Normative references
The following normative documents contain provisions which，through reference in this text,constitute provisions of this part of lEC60252. For dated references,subsequentamendments to,or revisions of,any of these publications do not apply.However，parties toagreements based on this part of lEC 60252 are encouraged to investigate the possibility ofapplying the most recent editions of the normative documents indicated below.For undatedreferences, the latest edition of the normative document referred to applies.Members of lECand lS0 maintain registers of currently valid lnternational Standards.
IEC 60068-2-3:1969，Environmental testing – Part 2: Tests – Test Ca: Damp heat, steadystate
IEC 60068-2-6:1995,Environmental testing – Part 2: Tests – Test Fc: Vibration (sinusoidal)IEC 60068-2-20:1979,Environmental testing – Part 2: Tests – Test T: Soldering
lEC 60068-2-21:1999，Environmental testing – Part 2-21: Tests – Test U: Robustness ofterminations and integral mounting devices
lEC 60112:1979，Method for determining the comparative and the proof tracking indices ofsolid insulating materials under moist conditions
IEC 60309-1:1999，Plugs,socket-outlets and couplers for industrial purposes – Part 1:General requirements
IEC 60529:1989,Degrees of protection provided by enclosures (IP Code)
IEC 60695-2-1/0:1994,Fire hazard testing – Part 2: Test methods – Section 1/sheet 0: Glow-wire test methods – General
IEC 60695-2-1/1:1994,Fire hazard testing – Part 2:Test methods – Section 1/sheet 1: Glow-wire end-product test and guidance
ISO 4046:1978, Paper, board,pulp and related terms – Vocabulary1.3Definitions
For the purpose of this part of IEC 60252,the following definitions apply.
1.3.1
motor running capacitor
a power capacitor which，when used in conjunction with an auxiliary winding of a motor,assists the motor to start and improves the torque under running conditions
NOTEThe running capacitor is usually connected permanently to the motor winding and remains in circuitthroughout the running period of the motor. During the starting period, if it is in parallel with the starting capacitor.it helps to start the motor.