IEEE 242-2001 pdf download IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems
1.1 Overview
1.1.1 Scope
IEEE Std 242-2001, commonly known as the IEEE Buff Bookrm , is published by the Instituteof Electrical and Electronics Engineers (IEEE) as a reference source to provide a betteunderstanding of the purpose for and techniques involved in the protection and coordinationof industrial and commercial power systems.
[EEE Std 242-2001 has been prepared on a voluntary basis by engineers and designersfunctioning as a working group within the IEEE,under the Industrial and Commercial PowerSystems Department of the Industry Applications Society. This recommended practice is notintended as a replacement for the many excellent exts available in this feld. TEEE Std 242-2001 complements the other standards in the IEEE Color Book Seriestm , and it emphasizesup-to-date techniques in power system protection and coordination that are most applicableto industrial and commercial power systems. Coverage is limited to system protection andcoordination as it pertains to system design treated in IEEE Std 141-1993′ and IEEStd 241-1990. No attempt is made to cover utility systems or residential systems, althoughmuch of the material presented is applicable to these systems.
This publication presents in a step-by-step, simplified, yet comprehensive, form theprinciples of system protection and the proper application and coordination of thosecomponents that may be required to protect industrial and commercial power systems againstabnormalities that could reasonably be expected to occur in the course of system operation.The principles presented are applicable to both new electrical system design and to thechanging, upgrading,or expansion of an existing electrical distribution system.
1.1.2 Objectives
The objectives ofelectrical system protection and coordination are to
Limit the extent and duration of service interruption whenever equipment failure,human error, or adverse natural events occur on any portion of the systemMinimize damage to the system components involved in the failure
The circumstances causing system malfunction are usually unpredictable; however, sounddesign and preventive maintenance can reduce the likelihood of system problems.The elec-trical system, therefore, should be designed and maintained to protect itself automatically.
1.1.2.1 Safety
Prevention of human injury is the most important objective when designing electrical sys-tems. Interrupting devices should have adequate interrupting capability. Energized partsshould be sufficiently enclosed or isolated to avoid exposing personnel to explosion, fire, arc-ing, or shock, Safety should always take priority over service continuity, equipment damage.or economics.
These fundamental principles of safety have always been adhered to by responsible engineersengaged in the design and operation of electrical systems. The National Electrical Code(NEC) (NFPA 70-1999), National Electrical Safety Code (NESC (Accredited StandardsCommittee C2-2002)NFPA 70E-2000and state and local codes all have prescribedpractices intended to enhance the safety of electrical systems. In recent years, an increasedconcern about safety has led to many studies resulting in detailed recommendations [from theNational Institute of Occupational Safety and Health (NIOSH)] and regulations relating toelectrical systems. Prominent among these are the regulations of the Occupational Safety andHealth Administration (OSHA) of the U.S. Department of Labor. Engineers and otherpersonnel engaged in the design and operation of electrical system protection should befamiliar with the most recent OSHA regulations, NIOSH Safely Alerts, and all otherapplicable codes and regulations relating to human safety.
IEEE 242-2001 pdf download
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