{"id":111280,"date":"2024-10-18T16:08:39","date_gmt":"2024-10-18T16:08:39","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/ieee-c57-91-1995\/"},"modified":"2024-10-24T22:00:56","modified_gmt":"2024-10-24T22:00:56","slug":"ieee-c57-91-1995","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/ieee\/ieee-c57-91-1995\/","title":{"rendered":"IEEE C57.91 1995"},"content":{"rendered":"

Revision Standard – Inactive – Superseded. General recommendations for loading 65 C rise mineral-oil-immersed distribution and power transformers are covered.<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
3<\/td>\nIntroduction <\/td>\n<\/tr>\n
4<\/td>\nParticipants <\/td>\n<\/tr>\n
7<\/td>\nCONTENTS <\/td>\n<\/tr>\n
9<\/td>\n1. Overview
1.1 Scope
1.2 Purpose
2. References <\/td>\n<\/tr>\n
10<\/td>\n3. Definitions <\/td>\n<\/tr>\n
11<\/td>\n4. Effect of loading beyond nameplate rating
4.1 General
4.2 Voltage and frequency considerations <\/td>\n<\/tr>\n
12<\/td>\n4.3 Supplemental cooling of existing self-cooled transformers
4.4 Information for user calculations <\/td>\n<\/tr>\n
13<\/td>\n5. Transformer insulation life
5.1 General
5.2 Aging equations
5.3 Percent loss of life <\/td>\n<\/tr>\n
19<\/td>\n6. Ambient temperature and its influence on loading
6.1 General
6.2 Approximating ambient temperature for air-cooled transformers <\/td>\n<\/tr>\n
20<\/td>\n6.3 Approximating ambient temperature for water-cooled transformers
6.4 Influence of ambient on loading for normal life expectancy <\/td>\n<\/tr>\n
21<\/td>\n7. Calculation of temperatures
7.1 Load cycles <\/td>\n<\/tr>\n
22<\/td>\n7.2 Calculation of temperatures <\/td>\n<\/tr>\n
27<\/td>\n7.3 Computer calculation of loading capability
7.4 Bibliography for clause 7 <\/td>\n<\/tr>\n
29<\/td>\n8. Loading of distribution transformers
8.1 Distribution transformer life expectancy
8.2 Limitations <\/td>\n<\/tr>\n
30<\/td>\n8.3 Types of loading <\/td>\n<\/tr>\n
33<\/td>\n9. Loading of power transformers
9.1 Types of loading and their interrelationship <\/td>\n<\/tr>\n
34<\/td>\n9.2 Limitations <\/td>\n<\/tr>\n
35<\/td>\n9.3 Normal life expectancy loading <\/td>\n<\/tr>\n
37<\/td>\n9.4 Planned loading beyond nameplate rating
9.5 Long-time emergency loading
9.6 Short-time emergency loading <\/td>\n<\/tr>\n
38<\/td>\n9.7 Loading information for specifications
9.8 Operation with part or all of the cooling out of service <\/td>\n<\/tr>\n
39<\/td>\nAnnex A\u2014Thermal evolution of gas from transformer insulation <\/td>\n<\/tr>\n
48<\/td>\nAnnex B\u2014Effect of loading transformers above nameplate rating on bushings, tap changers, and auxi… <\/td>\n<\/tr>\n
53<\/td>\nAnnex C\u2014Calculation methods for determining ratings and selecting transformer size <\/td>\n<\/tr>\n
61<\/td>\nAnnex D\u2014Philosophy of guide applicable to transformers with 55 \u00b0C average winding rise (65 \u00b0C hot… <\/td>\n<\/tr>\n
63<\/td>\nAnnex E\u2014Unusual temperature and altitude conditions <\/td>\n<\/tr>\n
65<\/td>\nAnnex F\u2014Cold-load pickup (CLPU) <\/td>\n<\/tr>\n
68<\/td>\nAnnex G\u2014Alternate temperature calculation method <\/td>\n<\/tr>\n
93<\/td>\nAnnex H\u2014Operation with part or all of the cooling out of service <\/td>\n<\/tr>\n
97<\/td>\nAnnex I\u2014Transformer insulation life <\/td>\n<\/tr>\n
107<\/td>\nAnnex J\u2014Hottest-spot temperature indicators and fiber optic detectors <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

IEEE Guide for Loading Mineral-Oil-Immersed Transformers<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
IEEE<\/b><\/a><\/td>\n1996<\/td>\n108<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":111281,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2644],"product_tag":[],"class_list":{"0":"post-111280","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-ieee","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/111280","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/111281"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=111280"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=111280"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=111280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}