{"id":445114,"date":"2024-10-20T08:40:21","date_gmt":"2024-10-20T08:40:21","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/ieee-c57-115-1991-2\/"},"modified":"2024-10-26T16:08:39","modified_gmt":"2024-10-26T16:08:39","slug":"ieee-c57-115-1991-2","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/ieee\/ieee-c57-115-1991-2\/","title":{"rendered":"IEEE C57.115-1991"},"content":{"rendered":"

Revision Standard – Inactive-Withdrawn. The guide covers modern power transformers rated above 100 MVA, three-phase equivalent and 65\u00b0C rise. The general approach is tutorial. Four different types of loading, that is, normal life expectancy loading, planned loading beyond nameplate rating, long-time emergency loading, and short-time emergency loading, are considered. The various effects of loading a transformer in excess of its nameplate rating are discussed. Temperature and maximum loading limitations are suggested.<\/p>\n

PDF Catalog<\/h4>\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
7<\/td>\n1 Scope
2 General
2.1 References
2.2 Effect of Loading Beyond Nameplate Rating <\/td>\n<\/tr>\n
8<\/td>\n2.3 Types of Loading and Their Interrelationship
2.3.2 Planned Loading Beyond Nameplate Rating <\/td>\n<\/tr>\n
9<\/td>\n2.3.3 Long-Time Emergency Loading
2.3.4 Short-Time Emergency Loading
Table 1 Coordination of Suggested Loading Type Duration and Temperature Range
Table 2 Suggested Maximum Temperature Limits for the Four Types of Loading <\/td>\n<\/tr>\n
10<\/td>\nEmergency Rating <\/td>\n<\/tr>\n
11<\/td>\n2.3.5 Interrelationship of Loading Types
2.3.6 Risk Considerations <\/td>\n<\/tr>\n
12<\/td>\n2.4 Temperature Limitations
2.5 Maximum Loading Limitations
2.6 Information for User Calculations
isnotsupplied <\/td>\n<\/tr>\n
13<\/td>\n2.7 Voltage and Frequency Considerations
3 Calculation of Temperature
3.1 List of Symbols <\/td>\n<\/tr>\n
14<\/td>\n3.2 Temperature Determination Equations
3.3 Equation Corrections
3.4 OilTimeConstant <\/td>\n<\/tr>\n
15<\/td>\n3.5 LoadLoss
3.6 ViscosityofO il
3.7 Aging of Insulation <\/td>\n<\/tr>\n
16<\/td>\nFig 2 Reciprocal of Absolute Temperature Scale <\/td>\n<\/tr>\n
17<\/td>\nOutlinedintheGuide <\/td>\n<\/tr>\n
18<\/td>\n3.8 Approximating Ambient Temperature for Air-cooled Transformers
3.8.1 Average Temperature
3.8.2 Average of Maximum Daily Temperatures
3.9 Basic Logic Diagram of Computer Program
4 Operation with Part or All of the Cooling Out of Service
4.1 For OA\/FA and OA\/FA\/FA Transformers
4.2 For OA\/FA\/FOA and OA\/FOA\/FOA Transformers <\/td>\n<\/tr>\n
19<\/td>\n4.3 For FOA and FOW Transformers <\/td>\n<\/tr>\n
21<\/td>\nAppendix A Thermal Evolution of Gas from Transformer Insulation.(References <\/td>\n<\/tr>\n
24<\/td>\nTap Changers and Auxiliary Components <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

IEEE Guide for Loading Mineral-Oil-Immersed Power Transformers Rated in Excess of 100 MVA (65C Winding Rise) (Folded into C57.91-1995) (65C Winding Rise) (Withdrawn)<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
IEEE<\/b><\/a><\/td>\n1991<\/td>\n40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":445122,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2644],"product_tag":[],"class_list":{"0":"post-445114","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\/445114","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\/445122"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=445114"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=445114"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=445114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}