NDLI: Short circuit protection of energy efficient motors

Please wait, while we are loading the content...

Short circuit protection of energy efficient motors

Content Provider	IEEE Xplore Digital Library
Author	Heath, D.W. Bradfield, H.L.
Copyright Year	1975
Abstract	Many years ago, the National Electrical Code established a maximum setting for this instantaneous trip breaker of seven times motor full load amperes (FLA), the theory being that that value was just above the typical 6X locked rotor current. In a 1986 IEEE IAS paper Scheda noted that the two most commonly encountered problems in applying high-efficiency motors are (1) replacing a standard motor with a high-efficiency motor, and (2) the need to use thermal sensors on larger machines since higher settings for electronic control would violate the NEC. His paper concludes: "It is suggested that work be done in the industry and standards organizations to serve the needs arising from the use of electronic detection of instantaneous currents for motor protection." This article addresses some of the work done in the industry to serve these needs and, in particular, how the use of an "electronic detection" inverse time circuit breaker can be appropriately applied when an instantaneous trip breaker would nuisance-trip.
Starting Page	41
Ending Page	44
Page Count	4
File Size	868793
File Format	PDF
ISSN	10772618
Volume Number	3
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Energy efficiency Surge protection Rotors National electric code Circuit breakers Magnetic circuits Magnetic devices Protective relaying AC motors Stator windings
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

The short circuit current ratings of surge protective devices (SPDs)

Use of inverse time, adjustable instantaneous pickup circuit breakers for short circuit and ground fault protection of energy efficient motors

NEMA Design E motors and controls

Turn Insulation Capability of Large AC Motors. Part 3 - Insulation Coordination

Right sizing circuit breakers in motor starters

Addressing nuisance tripping of instantaneous trip breakers in high efficiency motor applications

Addressing nuisance tripping of instantaneous trip breakers in high efficiency motor applications

Characteristics of Split-Phase Currents as a Source of Generator Protection [includes discussion]

Protective devices maintenance as it applies to the arc/flash hazard

Short circuit protection of energy efficient motors

Similar Documents

The short circuit current ratings of surge protective devices (SPDs)

Use of inverse time, adjustable instantaneous pickup circuit breakers for short circuit and ground fault protection of energy efficient motors

NEMA Design E motors and controls

Turn Insulation Capability of Large AC Motors. Part 3 - Insulation Coordination

Right sizing circuit breakers in motor starters

Addressing nuisance tripping of instantaneous trip breakers in high efficiency motor applications

Addressing nuisance tripping of instantaneous trip breakers in high efficiency motor applications

Characteristics of Split-Phase Currents as a Source of Generator Protection [includes discussion]

Protective devices maintenance as it applies to the arc/flash hazard

Short circuit protection of energy efficient motors