IEC 60034-11-2020 pdf free.Rotating electrical machines – Part 11: Thermal protection.
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60034-1:2017, Rotating electrical machines — Part 1: Rating and performance IEC 60034-12:2016, Rotating electrical machines — Part 12: Starting performance of single-
speed three-phase cage induction motors
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 thermal protection
protection of windings of a machine against excessive temperature resulting from conditions of overload or loss of cooling
3.2 thermal protection system
system for the protection of a machine winding against excessive temperature resulting from conditions of overload or loss of cooling by means of either thermal protector(s) or thermal detector(s)
3.3 thermal detector
electrically insulated device that is only sensitive to temperature, capable of initiating a switching function in a protection system when its temperature reaches a predetermined level
3.4 thermal protector
electrically insulated device that is sensitive to the temperature of the machine winding which carries machine current, capable of directly switching off the machine when its temperature reaches a predetermined level
Note 1 to entry: Some thermal protectors are sensitive to both temperature and current, the combination of which activates the direct switching off of the machine.
3.5 thermal overload with slow variation
overload condition or loss of cooling that produces a rise of temperature that is sufficiently slow that the temperature of the thermal protector or detector follows it without appreciable delay
3.6 thermal overload with rapid variation
overload condition or loss of cooling that produces a rise of temperature that is too rapid for the
temperature of the thermal protector or detector to follow without appreciable delay resulting in
a significant temperature difference between the thermal device and the part to be protected
3.7 maximum temperature after tripping
maximum value of the temperature that is reached by the protected part of the machine during the period which follows tripping by the thermal protection system
3.8 direct thermal protection
form of protection where the part of the machine in which the thermal detectors) or thermal protector(s) are incorporated is the part for which protection is being provided.IEC 60034-11 pdf free download.