{"id":399382,"date":"2024-10-20T04:42:31","date_gmt":"2024-10-20T04:42:31","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/ieee-c57-12-91-2020\/"},"modified":"2024-10-26T08:30:45","modified_gmt":"2024-10-26T08:30:45","slug":"ieee-c57-12-91-2020","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/ieee\/ieee-c57-12-91-2020\/","title":{"rendered":"IEEE C57.12.91-2020"},"content":{"rendered":"

Revision Standard – Active. To reflect current practice in the testing procedures of dry-type transformers, substantive changes to Clause 5, Clause 7, Clause 10, Clause 11, and Clause 13 of IEEE Std C57.12.91-2011 have been made in this revision. Also Annex B has been added to provide guidelines for converting test results measured at 60 Hz to the equivalent values at 50 Hz and vice versa. This revision does not address transformer requirements and specific test criteria; rather they are contained in appropriate standards such as IEEE Std C57.12.01 or in user specifications.<\/p>\n

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PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
1<\/td>\nIEEE Std C57.12.91\u2122-2020 Front cover <\/td>\n<\/tr>\n
2<\/td>\nTitle page <\/td>\n<\/tr>\n
4<\/td>\nNotice and Disclaimer of Liability Concerning the Use of IEEE Standards Documents <\/td>\n<\/tr>\n
7<\/td>\nParticipants <\/td>\n<\/tr>\n
9<\/td>\nIntroduction <\/td>\n<\/tr>\n
10<\/td>\nContents <\/td>\n<\/tr>\n
12<\/td>\n1. Overview
1.1 Scope
1.2 Purpose <\/td>\n<\/tr>\n
13<\/td>\n1.3 Word usage
2. Normative references <\/td>\n<\/tr>\n
14<\/td>\n3. Definitions
4. General
4.1 Test definitions
4.2 Test requirements <\/td>\n<\/tr>\n
15<\/td>\n4.3 Test sequence
4.4 Instrumentation
5. Resistance measurements
5.1 General
5.2 Measurements <\/td>\n<\/tr>\n
16<\/td>\n5.3 Determination of cold temperature <\/td>\n<\/tr>\n
17<\/td>\n5.4 Conversion of resistance measurements
5.5 Resistance measurement methods <\/td>\n<\/tr>\n
18<\/td>\n5.6 Resistance measurement connections and reporting <\/td>\n<\/tr>\n
19<\/td>\n6. Polarity and phase-relation tests
6.1 General
6.2 Subtractive and additive polarity <\/td>\n<\/tr>\n
21<\/td>\n6.3 Polarity tests\u2014single-phase transformers <\/td>\n<\/tr>\n
22<\/td>\n6.4 Polarity and phase-relation tests\u2014polyphase transformers <\/td>\n<\/tr>\n
25<\/td>\n7. Ratio test
7.1 General <\/td>\n<\/tr>\n
26<\/td>\n7.2 Tolerances for ratio
7.3 Ratio test methods <\/td>\n<\/tr>\n
28<\/td>\n8. Excitation losses and current
8.1 General <\/td>\n<\/tr>\n
29<\/td>\n8.2 Excitation loss test <\/td>\n<\/tr>\n
31<\/td>\n8.3 Waveform correction of excitation losses
8.4 Determination of excitation current <\/td>\n<\/tr>\n
32<\/td>\n8.5 Frequency conversion of excitation losses and current
9. Load losses and impedance voltage
9.1 General
9.2 Factors affecting the values of load losses and impedance voltage <\/td>\n<\/tr>\n
33<\/td>\n9.3 Tests for measuring load losses and impedance voltage <\/td>\n<\/tr>\n
39<\/td>\n9.4 Calculation of load losses and impedance voltage from test data <\/td>\n<\/tr>\n
41<\/td>\n9.5 Zero-phase-sequence impedance <\/td>\n<\/tr>\n
43<\/td>\n10. Dielectric test
10.1 Factory dielectric tests <\/td>\n<\/tr>\n
45<\/td>\n10.2 Dielectric tests in the field
10.3 Applied voltage tests <\/td>\n<\/tr>\n
46<\/td>\n10.4 Induced voltage tests <\/td>\n<\/tr>\n
47<\/td>\n10.5 Partial discharge tests <\/td>\n<\/tr>\n
48<\/td>\n10.6 Impulse tests <\/td>\n<\/tr>\n
52<\/td>\n10.7 Impulse tests on transformer neutrals
10.8 Detection of failure during impulse tests <\/td>\n<\/tr>\n
53<\/td>\n10.9 Insulation-power-factor tests <\/td>\n<\/tr>\n
54<\/td>\n10.10 Insulation-resistance tests <\/td>\n<\/tr>\n
55<\/td>\n11. Temperature rise test
11.1 General <\/td>\n<\/tr>\n
56<\/td>\n11.2 Ambient temperature measurements
11.3 Surface temperature measurements <\/td>\n<\/tr>\n
57<\/td>\n11.4 Cold-resistance measurements
11.5 Hot-resistance measurements <\/td>\n<\/tr>\n
58<\/td>\n11.6 Calculation of average winding temperature rise <\/td>\n<\/tr>\n
59<\/td>\n11.7 Correction factors <\/td>\n<\/tr>\n
60<\/td>\n11.8 Temperature rise test loading methods <\/td>\n<\/tr>\n
66<\/td>\n12. Short-circuit tests
12.1 Scope <\/td>\n<\/tr>\n
67<\/td>\n12.2 Short-circuit testing techniques <\/td>\n<\/tr>\n
72<\/td>\n12.3 Test requirements
12.4 Test procedure <\/td>\n<\/tr>\n
76<\/td>\n12.5 Failure detection techniques <\/td>\n<\/tr>\n
77<\/td>\n12.6 Analysis of test results and visual inspection <\/td>\n<\/tr>\n
80<\/td>\n12.7 Proof of satisfactory performance <\/td>\n<\/tr>\n
81<\/td>\n12.8 Required information for transformer short-circuit test reports
13. Audible sound-level measurements
13.1 General <\/td>\n<\/tr>\n
82<\/td>\n13.2 Instrumentation <\/td>\n<\/tr>\n
83<\/td>\n13.3 Test conditions <\/td>\n<\/tr>\n
84<\/td>\n13.4 Microphone positions
13.5 Sound pressure level measurements <\/td>\n<\/tr>\n
89<\/td>\n13.6 Determination of audible sound level of a transformer
13.7 Presentation of results <\/td>\n<\/tr>\n
92<\/td>\n14. Mechanical design tests
14.1 General
14.2 Components involved in lifting or moving
14.3 Tests of sealed dry-type transformers
15. Calculated data
15.1 Reference temperature <\/td>\n<\/tr>\n
93<\/td>\n15.2 Total losses
15.3 Efficiency
15.4 Voltage regulation <\/td>\n<\/tr>\n
94<\/td>\n16. Minimum information to be included in certified test data
16.1 General
16.2 Order data <\/td>\n<\/tr>\n
95<\/td>\n16.3 Rating data
16.4 Test data
16.5 Calculated data
16.6 Certification statement and approval <\/td>\n<\/tr>\n
96<\/td>\nAnnex A (informative) Bibliography <\/td>\n<\/tr>\n
97<\/td>\nAnnex B (normative) 50\/60 Hz frequency conversion of measured performance parameters <\/td>\n<\/tr>\n
102<\/td>\nBack cover <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

IEEE Standard Test Code for Dry-Type Distribution and Power 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>\n2020<\/td>\n102<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":399385,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2644],"product_tag":[],"class_list":{"0":"post-399382","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\/399382","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\/399385"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=399382"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=399382"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=399382"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}