NEMA ST 20-2021 一般用途干式变压器

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NEMA ST 20-2021

Dry-Type Transformers for General Applications

Published by:

National Electrical Manufacturers Association

1300 North 17th Street, Suite 900

Rosslyn, Virginia 22209

www.nema.org

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necessarily mean that there is unanimous agreement among every person participating in the development

of this document.

The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which

the document contained herein is one, are developed through a voluntary consensus standards

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NEMA ST 20-2021

Page i

CONTENTS

Foreword .................................................................................................................................................. vii

Scope ........................................................................................................................................................ viii

Section 1 Referenced Standards and Definitions .................................................................................... 1

1.1 Referenced Standards ............................................................................................................... 1

1.2 Definitions .................................................................................................................................. 2

Accessible...................................................................................................................... 2

Accessible, Readily ....................................................................................................... 2

Accessories ................................................................................................................... 2

Alternating Current ........................................................................................................ 2

Ampacity ........................................................................................................................ 2

Circuit ............................................................................................................................. 3

Combustible Materials ................................................................................................... 3

Contactor ....................................................................................................................... 3

Cooling Systems ............................................................................................................ 3

Crest ............................................................................................................................ 4

Current ......................................................................................................................... 4

Cycle ............................................................................................................................ 4

Diagrams ..................................................................................................................... 4

Dielectric Testing ......................................................................................................... 5

Distance ....................................................................................................................... 5

Distribution Center (Secondary Distribution) ............................................................... 6

Duty ............................................................................................................................. 6

Enclosures ................................................................................................................... 6

Equipment.................................................................................................................... 6

FCAN ........................................................................................................................... 6

FCBN ........................................................................................................................... 6

Frequency .................................................................................................................... 6

Grounded ..................................................................................................................... 7

Hertz ............................................................................................................................ 7

Impedance ................................................................................................................... 7

Insulation ..................................................................................................................... 7

Interlock ....................................................................................................................... 7

IR-Drop Compensation ................................................................................................ 7

K-Factor ....................................................................................................................... 7

Load (Output) .............................................................................................................. 7

Losses ......................................................................................................................... 8

Nonenclosed ................................................................................................................ 8

Overcurrent Protection ................................................................................................ 8

Part .............................................................................................................................. 8

Rating .......................................................................................................................... 8

Ratio ............................................................................................................................ 9

Reactor ........................................................................................................................ 9

Regulation of a Transformer ........................................................................................ 9

Resistant (Used as a Suffix) ...................................................................................... 10

Taps ........................................................................................................................... 10

Temperatures ............................................................................................................ 10

Transformer ............................................................................................................... 11

Knockout .................................................................................................................... 13

Twistout ..................................................................................................................... 13

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摘要：

NEMA ST 20-2021 一般用途干式变压器是面向通用场景的干式变压器标准文档。本页面围绕 NEMA ST 20-2021、一般用途干式变压器、干式变压器标准等核心关键词，提供标准标题、适用范围、技术要点与合规参考信息，帮助电气工程师、设备采购人员、制造商和检测机构快速了解该规范在干式变压器设计、选型、安装、运行与验收中的应用价值。通过优化内容结构，突出 NEMA ST 20-2021 的检索相关性和专业权威性，便于用户获取一般用途干式变压器的标准要求、参数信息及合规依据，提升查询效率与决

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