IEEE 1068:2015 pdf free download – IEEE Standard for the Repair and Rewinding of AC Electric Motors in the Petroleum, Chemical, and Process lndustries
3.Definitions
For the purposes of this document，the following terms and definitions apply. The IEEE StandardsDictionary Online should be consulted for terms not defined in this clause.Tl
accepted test: A test on a system or model system that simulates the electrical, thermal, mechanical, andenvironmental stresses occurring in service.
insulation class: Insulation systems are divided into classes according to the thermal endurance of thesystem for temperature rating purposes.NEMA classes of insulation systems used in motors includeClasses A, B,F， and H. These classes have been established in accordance with IEEE Std 1TM ,12 Theinsulation systems shall be as follows:
a)NEMA Class A: An insulation system (105 C temperature limit which is typically a 65 C rise above a 40 °C ambient) that by experience or accepted test can be shown to have suitable thermalendurance when operating at the limiting Class A temperature specified in the temperature risestandard for the machine under consideration.
b) NEMA Class B: An insulation system (130 °C temperature limit which is typically a 90 C rise above a 40 °C ambient) that by experience or accepted test can be shown to have suitable thermalendurance when operating at the limiting Class B temperature specified in the temperature risestandard for the machine under consideration.
c)NEMA Class F: An insulation system (155 °C temperature limit which is typically a 115 °C rise above a 40 °C ambient) that by experience or accepted test can be shown to have suitable thermalendurance when operating at the limiting Class F temperature specified in the temperature risestandard for the machine under consideration.
d) NEMA Class H: An insulation system (180 °C temperature limit which is typically a l40 C rise above a 40 °C ambient) that by experience or accepted test can be shown to have suitable thermalendurance when operating at the limiting Class H temperature specified in the temperature risestandard for the machine under consideration.
insulation system: An assembly of insulating materials in association with the conductors and thesupporting structural parts. All the components described as follows that are associated with the stationarywinding constitute one insulation system, and all the components that are associated with the rotating winding constitute another insulation system:
a)Coil insulation with its accessories: All the insulating materials that envelop and separate the current-carrying conductors and their component turns and strands，and form the insulationbetween them and the machine structure;includes wire coatings，varnish，encapsulants，slotinsulation,slot fillers，tapes，phase insulation, semi-conductive and gradient stator coil coatings,pole-body insulation, and retaining ring insulation when present.
b)Connection and winding support insulation: All the insulation materials that envelop the connections that carry current from coil to coil, and from stationary or rotating coil terminals to thepoints of external circuit attachment; and the insulation of any metallic supports for the winding.c)Associated structural parts (insulation system): Items such as slot wedges,space blocks, and ties that are used to position or support the coil and connections; any non-metallic supports for thewinding; and field-coil flanges.
motor: A rotating machine that converts electrical power into mechanical power.