IEC 60470:2000 pdf download
IEC 60470:2000 pdf download.High-voltage alternating current contactorsand contactor-based motor-starters.
3.4.110.7
rheostatic rotor starter
a rheostatic starter for an asynchronous wound-rotor motor which, during the starting period, cuts out successively one or several resistors previously provided in the rotor circuit
[1EV 441.14-43]
3.4.110.8
reactor starter
a starter that includes a reactor connected in series with the stator winding of an alternating current motor to furnish reduced voltage for starting
3.4.110.9
combination starter (often referred to as a controller)
equipment consisting of a contactor, overload protection, a manual eternaIly operated disconnector and a short-circuit protective device, mounted and wired in a dedicated enclosure
NOTE I A dedicated enclosure is an enclosure specifically designed and dimensioned for its application, in which all tests are conducted, and wtiich may also include an earthing function.
NOTE 2 A combination starter may be used for functIons other than motor starting, for example transformer control and protection.
3.4.110.10
electromagnetic starter
a starter in which the force for closing the main contacts is provided by an electromagnet
3.4.110.11
n-step starter
a starter in which there are (n — 1) intermediate accelerating positions between the off and full on positions [1EV 441-14-41]
NOTE 1 A starter in which there is no intermediate accelerating position between the OFF and ON positions is a single step or direct-or-llne starter (see 3.4.110.1).
NOTE 2 A starter In Much there s only one intermediate accelerating position between the OFF and ON positions is known as a two-step start.r.
NOTE 3 A three-step rheostatic starter has two sections of resistors used for starting.
3.4.110.12
short-circuit protective device (SCPD)
a device intended to protect a circuit or parts of a circuit against short-circuit currents by interrupting them
3.5 Part. of switchgear and controlgear
3.5.101
pole of a switching device
the portion of a switching device associated exclusively with one electrically separated conducting path of its main circuit and excluding those portions which provide a means for mounting and operating all poles together [1EV 441-15-01]
NOTE A switching device Is called single-pole if It has only one pole. If it has more than one pole, it may be called multipole (two-pole, three-pole, etc.) provided the poles are or can be coupled in such a manner as to operate together.
3.5.102
main circuit (of a switching device)
all the conductive parts of a switching device included in the circuit which it is designed to close or open (1EV 441-15-02]
3.5.103
control circuit (of a switching device)
all the conductive parts (other than the main circuit) of a switching device which are included in a circuit used for the closing operation or opening operation, or both, of the device (1EV 441-15-03]
3.5.104
auxiliary circuit (of a switching device)
all the conductive parts of a switching device which are intended to be included in a circuit other than the main circuit and the control circuits of the device [1EV 441-15-04]
NOTE Some auxallary circuits fulfil suppementary functions such as signalling, interlocking, etc., and, as such, they may be part of the control circurt of another switching device.
3.5.105
main contact
a contact ncluded in the main circuit of a mechanical switching device, intended to carry, in the closed position. the current of the main circuit [1EV 441-15-07]
3.5.106
control contact
a contact included in a control circuit of a mechanical switching device and mechanically operated by this device [1EV 441-15-09]
3.5.107
auxiliary contact
a contact included in an auxiliary circuit and mechanically operated by the switching device
[1EV 441-15-10]
3.5.108
na” contact; make contact
a control or auxiliary contact which is closed when the main contacts of the mechanical switching device are closed and open when they are open [1EV 441-15-12]
3.5.109
Mb contact; break contact
a control or auxiliary contact which is open when the main contacts of a mechanical switching device are closed and closed when they are open [1EV 441-15-13]
3.6 Operation
3.6.101
operation (of a mechanical switching device)
the transfer of the moving contact(s) from one position to an adjacent position [1EV 441-16-01)
NOTE 1 For a circuit-breaker, this may be a closing operation or an opening operation.
NOTE 2 If distinchon Is necessary, an operation in the electrical sense. e.g. make or break, is referred to as a switching operation, and an operation in the mechanical sense, e.g. close or open, is referred to as a mechanical operation.
3.6.102
operating cycle (of a mechanical switching device)
a succession of operations from one position to another and back to the first position through all other positions, if any [1EV 441-16-02)
NOTE 1 This may be a closing operation followed by an opening operation.
NOTE 2 A succession of operations not forming an operating cycle is referred to as an Operating series.
