IEEE Std 841:2021 pdf download.IEEE Standard for Petroleum and Chemical Industry-Premium-Efficiency, Severe-Duty,Totally Enclosed Squirrel Cage Induction Motors from 0.75kWto370kW(1hpto500hp).
IEEE Std 841 applies to premium-efficiency totally enclosed fan-cooled (TEFC) and totally enclosed non- ventilated (TENV), horizontal and vertical, single-speed. squirrel cage polyphase induction motors. 0.75 kW to 370 kW (1 hp to 500 hp). and up to 4000 V nominal, in National Electrical Manufacturers Association (NEMA) frame sizes 1 43T and larger, for petroleum, chemical, and other severe-duty applications (commonly referred to as premium-efficiency severe-duty motors). Excluded from the scope of this standard are motors with sleeve bearings and additional specific features required for explosion-proof motors.
1.2 Purpose
The purpose of this standard is to define a specification that deals with mechanical and electrical performance. electrical insulation systems. corrosion protection, and electrical and mechanical testing for severe-duty totally enclosed squirrel cage polyphase induction motors, 0.75 kW to 370 kW (1 hp to 500 hp), for petroleum, chemical, and other severe-duty applications (commonly referred to as premium-efficiency severe-duty motors). Many of the specified materials and components in this standard stem from experience with severely corrosive atmospheres and the necessity for safe, quiet, reliable, premium-efficiency motors.
1.3 Word usage
The word shall indicates mandatory requirements strictly to be followed in order to conform to the standard and from which no deviation is permitted.
The word should indicates that among several possibilities one is recommended as particularly suitable. without mentioning or excluding others; or that a certain course of action is preferred but not necessarily required (should equals is reconunended that).
The word mai’ is used to indicate a course of action permissible within the limits of the standard (mai’ equals is permitted to).
The word can is used for statements of possibility and capability, whether material, physical, or causal (caii equals is able to).
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
ABMA 20. Radial Bearings of Ball. Cylindrical Roller and Spherical Roller Types—Metric Design.
ASME B 1.1, Unified Inch Screw Threads (UN, UNR, and UNJ Thread Forms).
ASTM B 117, Standard Practice for Operating Salt Spray (Fog) Apparatus.
CSA C390- 10, Test methods, marking requirements, and energy efficiency levels for three-phase induction motors.
IEC 60034-2-I, Rotating Electrical Machines—Part 2-1: Standard methods for determining losses and efficiency from tests (excluding machines for traction vehicles).
IEEE Std 43TM, IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery.9 IEEE Std 11 2Ts1, IEEE Standard Test Procedure for Polyphase Induction Motors and Generators.
IEEE Std 117TM, IEEE Standard Test Procedure for Thermal Evaluation of Systems of Insulating Materials for Random-Wound AC Electric Machinery.
IEEE Std 522, IEEE Guide for Testing Turn Insulation of Form-Wound Stator Coils forAlternating-Current Electric Machines.
IEEE Std 1776, IEEE Recommended Practice for Thermal Evaluation of Unsealed or Sealed Insulation
Systems for AC Electric Machinery Employing Form-Wound Pre-insulated Stator Coils for Machines Rated 15 000 V and Below.
NEMA MG 1, Motors and Generators.IEEE Std 841 pdf download.