NDLI: Maximum Demand and Demand Factors in Underground Coal Mining

Content Provider	IEEE Xplore Digital Library
Author	Croyle, Floyd D. Kohler, Jeffrey L. Bise, Christopher J.
Copyright Year	1972
Abstract	Maximum demand is an important parameter in electricutility rate structures and in establishing demand factors. If meaningful demand factors for a specific-type electrical system are available, they can be applied in the estimation of demand charges and in the design of new systems. However, the basis for the demand factor is not necessarily the same for both uses. It is the differences in the intended application that are problematic because the measurement and subsequent calculation of utility demand and demand factor is based upon billing practices, not design considerations. Maximum demand, and hence demand factor, which is intended for use in design, should relate in some way to the thermal characteristics of primary electrical components since equipment capacity is determined by allowable temperature-rise limits. A brief review of maximum demand is presented. Then appropriate applications of demand factors are described, as well as recommended methods for their calculation, based upon usage. Included in this is an examination of the thermal characteristics of transformers, motors, and cables, so that a partial relationship may be found between demand and electrical component temperature rise. Finally the conclusion contains a description of the data collection activities and necessary calculations to arrive at meaningful demand factors for an American retreating longwall system.
Sponsorship	IEEE Industry Applications Society
Starting Page	1105
Ending Page	1111
Page Count	7
File Size	2818764
File Format	PDF
ISSN	00939994
Volume Number	IA-23
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1987-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power industry Mining industry Industry Applications Society Thermal factors Transformers Cables Temperature Electrical equipment industry Power demand
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering 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

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