{"id":80631,"date":"2024-10-17T18:46:22","date_gmt":"2024-10-17T18:46:22","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/ieee-c57-12-91-1979\/"},"modified":"2024-10-24T19:44:10","modified_gmt":"2024-10-24T19:44:10","slug":"ieee-c57-12-91-1979","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/ieee\/ieee-c57-12-91-1979\/","title":{"rendered":"IEEE C57.12.91 1979"},"content":{"rendered":"

New IEEE Standard – Inactive – Superseded. Methods for performing tests specified in IEEE Std C57.12.01-1989 and other referenced standards applicable to dry-type distribution and power transformers are described. This standard is intended for use as a basis for performance, safety, and the proper testing of dry-type distribution and power transformers. This standard applies to all dry-type transformers except instrument transformers, step-voltage and induction voltage regulators, arc furnace transformers, rectifier transformers, specialty transformers, and mine transformers.<\/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\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
8<\/td>\n1 Scope
2 Terminology
3 References <\/td>\n<\/tr>\n
9<\/td>\n4 General
4.1 Test Definitions
4.2 Test Requirements
4.3 Purpose
4.4 Testsequence
4.5 Instrumentation
5 Resistance Measurements
5.1 Importance of Measurements
5.2 Determination of Cold Temperature
5.3 Conversion of Resistance Measurements <\/td>\n<\/tr>\n
10<\/td>\n5.4 Resistance Measurement Methods
Connections for the Voltmeter-Ammeter Method of Resistance Measurement <\/td>\n<\/tr>\n
11<\/td>\n6 Polarity and Phase-Relation Tests
6.1 General
6.2 Polarity Tests – Single-phase Transformers
Polarity by Inductive Kick Test <\/td>\n<\/tr>\n
12<\/td>\n6.3 Polarity and Phase-Relation Tests – Polyphase Transformers
Polarity by Alternating-Voltage Test <\/td>\n<\/tr>\n
13<\/td>\nThree-phase Transformer Connections <\/td>\n<\/tr>\n
14<\/td>\n7 RatioTests
7.1 General
Six-Phase Transformer Connections <\/td>\n<\/tr>\n
15<\/td>\n7.2 Tolerances for Ratio
7.3 Ratio Test Methods
Two Secondary Voltages
Voltmeters Arranged to Read the Two Secondary Voltages <\/td>\n<\/tr>\n
16<\/td>\n8 No-Load Losses and Excitation Current
8.1 No-Load Losses – General
8.2 Test Methods for Single-phase Transformers
Basic Circuit of Ratio Bridge <\/td>\n<\/tr>\n
17<\/td>\nConnections for the No-Load-Loss Test of a Single-phase Transformer <\/td>\n<\/tr>\n
19<\/td>\n8.3 Test Methods for Three-phase Transformers
Two-Wattmeter Method
Three-Wattmeter Method with Transformer Neutral Available
Three-Wattmeter Method Using Artificial Wattmeter Neutral N <\/td>\n<\/tr>\n
20<\/td>\n8.4 Excitation Current (No-Load Current)
Form-Factor Plot to Reduce Excitation Current to Sine-Wave Basis <\/td>\n<\/tr>\n
21<\/td>\n9 Impedance and Load Losses
9.1 General
9.2 Impedance and Load-Loss Test Procedures <\/td>\n<\/tr>\n
22<\/td>\nImpedance-Voltage Tests
Autotransformer <\/td>\n<\/tr>\n
23<\/td>\nImpedance-Voltage Tests Using Three-Wattmeter Method
Impedance-Voltage Tests Using Two-Wattmeter Method <\/td>\n<\/tr>\n
25<\/td>\n9.3 Interlacing Impedance Voltage of a Scott-Connected Transformer
Calculation of Impedance Voltage and Load Loss from Test Data
9.5 Impedance Bridges <\/td>\n<\/tr>\n
26<\/td>\nGeneral Impedance Bridge Network
Potentiometer-Type Network Using a Phase Shifter <\/td>\n<\/tr>\n
27<\/td>\n10 Dielectric Tests
10.1 Factory Dielectric Tests
Potentiometer-Type Network Using a Mutual Inductor <\/td>\n<\/tr>\n
28<\/td>\n10.2 Dielectric Tests in the Field
10.3 Applied-Voltage Tests <\/td>\n<\/tr>\n
29<\/td>\n10.4 Induced-Voltage Tests
10.5 ImpulseTests <\/td>\n<\/tr>\n
31<\/td>\n10.6 Impulse Tests on Transformer Neutrals
10.7 Detection of Failure during Impulse Test <\/td>\n<\/tr>\n
32<\/td>\n10.8 Insulation-Power-Factor Tests
10.9 Insulation-Resistance Tests
Measurements to be Made in Insulation Power Factor Tests <\/td>\n<\/tr>\n
33<\/td>\n11 Temperature Tests
11.1 General
11.2 Temperature Test Methods <\/td>\n<\/tr>\n
34<\/td>\n11.3 Requirements for Temperature-Rise Tests <\/td>\n<\/tr>\n
35<\/td>\nAverage Winding Temperature Rise by the Hot-Resistance Method <\/td>\n<\/tr>\n
36<\/td>\n11.5 Correction Factors
11.6 Temperature-Rise Test Procedures
Empirical Factor for Various Types of Cooling <\/td>\n<\/tr>\n
37<\/td>\nTwo Single-phase Transformers in Opposition
Two Y-A Connected Transformers <\/td>\n<\/tr>\n
38<\/td>\nA-A Connection for Three Single-phase Units or One Three Phase Unit <\/td>\n<\/tr>\n
39<\/td>\n12 Short-circuit Tests
12.1 Scope <\/td>\n<\/tr>\n
40<\/td>\n12.2 Test Connections
12.3 Test Requirements <\/td>\n<\/tr>\n
41<\/td>\n12.4 TestProcedure <\/td>\n<\/tr>\n
42<\/td>\n12.5 Proof of Satisfactorv Performance <\/td>\n<\/tr>\n
43<\/td>\n13 Audible Sound-Level Measurements
13.1 General
13.2 Instrumentation
13.3 Test Conditions <\/td>\n<\/tr>\n
44<\/td>\n13.4 Microphone Positions
13.5 Sound-Level Measurements
13.6 Optional Frequency Analysis Measurements <\/td>\n<\/tr>\n
45<\/td>\n14 Mechanical Tes ts
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 Temperatures for Average Winding Rises
15.2 TotalLosses <\/td>\n<\/tr>\n
46<\/td>\n15.3 Efficiency
15.4 Voltage Regulation of a Constant-Voltage Transformer
Regulation and Efficiency <\/td>\n<\/tr>\n
48<\/td>\nMinimum Information to be Included in Certified Test Data <\/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>\n1979<\/td>\n49<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":80632,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2644],"product_tag":[],"class_list":{"0":"post-80631","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\/80631","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\/80632"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=80631"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=80631"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=80631"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}