{"id":436411,"date":"2024-10-20T07:54:25","date_gmt":"2024-10-20T07:54:25","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/ieee-c37-121-2020\/"},"modified":"2024-10-26T14:55:29","modified_gmt":"2024-10-26T14:55:29","slug":"ieee-c37-121-2020","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/ieee\/ieee-c37-121-2020\/","title":{"rendered":"IEEE C37.121-2020"},"content":{"rendered":"

Revision Standard – Active. The basis for the coordination of equipment in unit substations by assisting in the selection of components is intended as the use of this guide. A variety of designs for unit substations are possible using various combinations of incoming sections, transformer sections, outgoing sections, and transition sections. It is intended that the incoming, outgoing, transformer, and transition sections included in a unit substation meet the basic requirements of applicable industry standards for those sections. This guide covers three-phase unit substations for step-down operation in the range of 112.5 kVA or greater at primary voltages of 601 V through 52 kV.<\/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
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
1<\/td>\nIEEE Std C37.121\u2122-2020 Front cover <\/td>\n<\/tr>\n
2<\/td>\nTitle page <\/td>\n<\/tr>\n
4<\/td>\nImportant Notices and Disclaimers Concerning IEEE Standards Documents <\/td>\n<\/tr>\n
8<\/td>\nParticipants <\/td>\n<\/tr>\n
9<\/td>\nIntroduction <\/td>\n<\/tr>\n
10<\/td>\nContents <\/td>\n<\/tr>\n
12<\/td>\n1.\u2002Overview
1.1\u2002Scope
1.2\u2002Purpose <\/td>\n<\/tr>\n
13<\/td>\n1.3\u2002Word usage
2.\u2002Normative references <\/td>\n<\/tr>\n
14<\/td>\n3.\u2002Definitions <\/td>\n<\/tr>\n
15<\/td>\n4.\u2002Service conditions
4.1\u2002General
4.2\u2002Usual service conditions <\/td>\n<\/tr>\n
16<\/td>\n4.3\u2002Unusual service conditions
5.\u2002Transformer section
5.1\u2002General <\/td>\n<\/tr>\n
18<\/td>\n5.2\u2002Primary unit substation transformers
5.3\u2002Secondary unit substation transformers <\/td>\n<\/tr>\n
19<\/td>\n6.\u2002Incoming section
6.1\u2002General
6.2\u2002High-voltage (or primary) bushings on the transformer cover
6.3\u2002Primary terminal chamber on the transformer
6.4\u2002Metal-enclosed bus
6.5\u2002Metal-clad or metal-enclosed switchgear <\/td>\n<\/tr>\n
21<\/td>\n6.6\u2002Metal-enclosed interrupter switchgear <\/td>\n<\/tr>\n
22<\/td>\n6.7\u2002Cutout, fuse, or fuse link
6.8\u2002Metal-enclosed switchgear incorporating gas insulation systems
7.\u2002Outgoing section
7.1\u2002General
7.2\u2002Metal-clad switchgear <\/td>\n<\/tr>\n
23<\/td>\n7.3\u2002Metal-enclosed interrupter switchgear
7.4\u2002Metal-enclosed bus
7.5\u2002Metal-enclosed, low-voltage, power circuit breaker switchgear
7.6\u2002Switchboards
7.7\u2002Motor control centers
8.\u2002Ratings
8.1\u2002General
8.2\u2002Rated power frequency
8.3\u2002Rated kVA <\/td>\n<\/tr>\n
24<\/td>\n8.4\u2002Rated high voltage (or primary voltage) and rated low voltage (or secondary voltage)
8.5\u2002Rated continuous current
8.6\u2002Rated short-time withstand current
8.7\u2002Rated momentary withstand current
8.8\u2002Rated power frequency withstand voltages <\/td>\n<\/tr>\n
25<\/td>\n8.9\u2002Rated lightning impulse withstand voltage (BIL)
9.\u2002Construction
9.1\u2002General
9.2\u2002Phase and polarity arrangements
9.3\u2002Phase sequence
9.4\u2002Metal barriers
9.5\u2002Interlocks <\/td>\n<\/tr>\n
26<\/td>\n9.6\u2002Grounding
9.7\u2002Nameplates
9.8\u2002Drawings, diagrams, instructions
9.9\u2002Coordination <\/td>\n<\/tr>\n
27<\/td>\n10.\u2002Typical arrangements
10.1\u2002General
10.2\u2002Primary unit substations <\/td>\n<\/tr>\n
29<\/td>\n10.3\u2002Secondary unit substations <\/td>\n<\/tr>\n
32<\/td>\n11.\u2002Guide for selection, application, installation, and maintenance of unit substations
11.1\u2002Application considerations
11.2\u2002Unusual service conditions <\/td>\n<\/tr>\n
33<\/td>\n11.3\u2002System conditions
11.4\u2002Transformer selection <\/td>\n<\/tr>\n
34<\/td>\n11.5\u2002Load requirements
11.6\u2002Miscellaneous design considerations <\/td>\n<\/tr>\n
36<\/td>\n11.7\u2002Installation, field-testing, operation, and maintenance <\/td>\n<\/tr>\n
38<\/td>\nAnnex\u00a0A (informative) Bibliography <\/td>\n<\/tr>\n
40<\/td>\nBack cover <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

IEEE Guide for Switchgear–Unit Substation–Requirements<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
IEEE<\/b><\/a><\/td>\n2020<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":436420,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2644],"product_tag":[],"class_list":{"0":"post-436411","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\/436411","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\/436420"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=436411"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=436411"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=436411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}