1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1561 Dry-Type General Purpose and Power TransformersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTH
2、ORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Dry-Type General Purpose and Power Transformers, UL 1561 Fourth Edition, Dated March 2, 2011 Summary of Topics This revision of ANSI/UL 1561 incorporates the following change: Addition of Overload T
3、est Requirements for Class 240 Insulation Systems The effective date for UL LLC will be announced through Industry File Review Announcement Letter. The new requirements are substantially in accordance with Proposal(s) on this subject dated March 20, 2015. Text that has been changed in any manner or
4、impacted by ULs electronic publishing system is marked with a vertical line in the margin. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without p
5、rior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or si
6、milar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage e
7、ver exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fe
8、es) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. JUNE 16, 2015 UL 1561 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 16, 2015 UL 1561 tr2 No T
9、ext on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 2, 2011 (Title Page Reprinted: June 16, 2015) 1 UL 1561 Standard for Dry-Type General Purpose and Power Transformers Prior to the rst edition, the requirements for the pro
10、ducts covered by this standard were included in a supplement to the Standard for Specialty Transformers, UL 506. Prior to March 27, 1987, the rst edition was titled the Standard for Large General Purpose Transformers. First Edition January, 1986 Second Edition April, 1994 Third Edition March, 1999 F
11、ourth Edition March 2, 2011 This ANSI/UL Standard for Safety consists of the Fourth Edition including revisions through June 16, 2015. The most recent designation of ANSI/UL 1561 as an American National Standard (ANSI) occurred on June 16, 2015. ANSI approval for a standard does not include the Cove
12、r Page, Transmittal Pages and Title Page. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are
13、copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 156
14、1-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 2, 2011 DRY-TYPE GENERAL PURPOSE AND POWER TRANSFORMERS - UL 1561 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMI
15、SSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Components 5 3 Units of Measurement .6 4 Undated References 6 5 Glossary .6 CONSTRUCTION 6 Mechanical Assembly .7 7 Enclosure 8 7.1 General .8 7.2 Sheet metal 8 7.3 Nonmetallic enclosures 9 7.4 Mounting .10 7.5 Covers .10 7.6 Ventilation 10 7.7 Specic
16、 environmental conditions .11 7.8 Corrosion protection .13 8 Corrosion Resistance .13 9 Supply and Load Connections .15 10 Field Wiring Connections 16 10.1 General .16 10.2 Leads .16 10.3 Pressure terminal connectors 17 11 Current-Carrying Parts 18 12 Electrical Insulation .20 13 Internal Wiring 20
17、14 Coil Insulation 21 15 Coil Details 21 16 Electrical Spacings 21 17 Insulating Barriers 25 18 Transient Voltage Surge Suppressors .26 19 Capacitors .26 20 Surge Arresters .26 PERFORMANCE 21 General 26 22 Impedance Test 28 23 Temperature Test .28 23.1 General .28 23.2 Units for wall mounting 33 23.
18、3 Units for oor mounting .34 23.4 Clamped bus joint 35 24 Dielectric Voltage-Withstand Test .35 24.1 Applied potential .35 24.2 Induced potential .36 25 Overload Test 37 MARCH 2, 2011 DRY-TYPE GENERAL PURPOSE AND POWER TRANSFORMERS - UL 1561 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPROD
19、UCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 26 Dielectric Voltage-Withstand Test Repeated 37 27 Lifting or Mounting Means Test .38 28 Enclosure Strength Tests 39 28.1 Deection test .39 28.2 Compression test .39 29 Clamped Insulating Joint and Insulating Barrier Tests .39 30 Water Spray Test .4
20、0 31 Drip Test 43 32 Icing Test 43 33 Rust Resistance Test .44 34 Corrosion Resistance Test .44 35 Metallic Coating Thickness Test 44 36 Production-Line Dielectric Voltage-Withstand Test 46 RATINGS 37 General 47 MARKINGS 38 Details .50 38.1 General .50 38.2 Nonsinusoidal load ratings .50 38.3 Insula
21、tion temperature class .51 38.4 Temperature rise .51 38.5 Temperature sensor 51 38.6 Ambient temperature .51 38.7 Autotransformer, elevated voltage (buck or boost) 51 38.8 Impedance 52 38.9 Environmental condition enclosures 52 38.10 Mounting .52 38.11 Weight .53 38.12 Field wiring .53 39 Permanence
22、 of Marking .54 APPENDIX A Standards for ComponentsA1 MARCH 2, 2011 DRY-TYPE GENERAL PURPOSE AND POWER TRANSFORMERS - UL 1561 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover: a) General purp
23、ose and power transformers of the air-cooled, dry, ventilated, and nonventilated types to be used in accordance with the National Electrical Code, ANSI/NFPA 70. Constructions include step up, step down, insulating, and autotransformer type transformers as well as air- cooled and dry-type reactors or
24、 b) General purpose and power transformers of the exposed core, air-cooled, dry, and compound-lled types rated more than 10 kVA to be used in accordance with the National Electrical Code, ANSI/NFPA 70. Constructions include step up, step down, insulating, and autotransformer type transformers as wel
25、l as air-cooled, dry, and compound-lled type reactors. 1.2 These requirements do not cover ballasts for high intensity discharge (HID) lamps (metal halide, mercury vapor, and sodium types) or uorescent lamps, exposed core transformers, compound-lled transformers, liquid-lled transformers, voltage re
26、gulators, general use or special types of transformers covered in requirements for other electrical equipment, autotransformers forming part of industrial control equipment, motor-starting autotransformers, variable voltage autotransformers, transformers having a nominal primary or secondary rating
27、of more than 600 volts, or overvoltage taps rated greater than 660 volts. 1.3 These requirements do not cover transformers provided with waveshaping or rectifying circuitry. Waveshaping or rectifying circuits may include components such as diodes and transistors. Components such as capacitors, trans
28、ient voltage surge suppressors, and surge arresters are not considered to be waveshaping or rectifying devices. 2 Components 2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards
29、 covering components used in the products covered by this standard. 2.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a req
30、uirement in this standard. 2.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited cond
31、itions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. MARCH 2, 2011 DRY-TYPE GENERAL PURPOSE AND POWER TRANSFORMERS - UL 1561 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL
32、 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 3.2 Unless otherwise indicated, all voltages and current values mentioned in this standard are root-mean-square (rms). 4 Undated References 4.1 Any und
33、ated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 5 Glossary 5.1 For the purpose of this standard the following denitions apply. 5.2 COMPOUND-FILLED TRANSFORMER A transformer in which
34、the windings are enclosed with an insulating uid which becomes solid, or remains plastic, at intended operating temperatures. 5.3 ENCAPSULATED COIL A coil that a) Is enclosed with an insulating uid that becomes solid and b) Can be used in either a ventilated or nonventilated transformer. 5.4 EXPOSED
35、 CORE TRANSFORMER A transformer with exposed core laminations. 5.5 K-FACTOR A rating optionally applied to a transformer indicating its suitability for use with loads that draw nonsinusoidal currents. The K-factor equals: in which: I h (pu) is the rms current at harmonic h (per unit of rated rms loa
36、d current) and h is the harmonic order. K-factor rated transformers have not been evaluated for use with harmonic loads where the rms current of any singular harmonic greater than the tenth harmonic is greater than 1/h of the fundamental rms current. 5.6 NONVENTILATED DRY-TYPE TRANSFORMER A dry-type
37、 transformer other than of the compound-lled or exposed core type that is constructed so as to provide no intentional circulation of ambient air through the transformer and is intended to operate at normal ambient air pressure. MARCH 2, 2011 DRY-TYPE GENERAL PURPOSE AND POWER TRANSFORMERS - UL 1561
38、6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.7 VENTILATED DRY-TYPE TRANSFORMER A dry-type transformer that is constructed so that ambient air may circulate through the enclosure to cool the transformer core and windings. CONSTRUCTION 6
39、 Mechanical Assembly 6.1 A transformer shall be complete when it is shipped from the factory. Exception No. 1: A transformer that is complete for indoor use may have provision for a eld-added rainproof hood if the transformer is marked in accordance with 38.9.2 and 38.9.3. Exception No. 2: A transfo
40、rmer that is complete for intended use may have provision for a eld-added extension to the enclosure to provide for additional wiring space. Exception No. 3: Wire connectors may be eld supplied. 6.2 A transformer that weighs more than 100 pounds (45 kg) shall be provided with a means for lifting by
41、a fork lift, a cable, a sling, or the equivalent. The lifting means may be provided on the transformer core or frame or the equivalent if the transformer has a removable top cover. The lifting means shall be subjected to the Lifting or Mounting Means Test, Section 27. Exception: The lifting means te
42、st does not apply to a transformer that is intended to be lifted from underneath by a fork lift or other means. 6.3 A transformer shall be marked in accordance with 38.11.1. The weight of the transformer shall not exceed 110 percent of the weight marked on the transformer. 6.4 A solid rivet, screw,
43、bolt, or similar fastener in a sheet metal enclosure shall have a diameter at least 50 percent greater than the sum total thickness of all the sheet metal items secured by the fastener. Screws securing covers shall comply with 7.5.2. Screws threaded directly into a metal component of the enclosure s
44、hall meet or exceed the torque requirements in 6.5(b). Exception No. 1: A fastening device as described in 6.5 may be used. Exception No. 2: A machine screw fully engaging two complete threads need not be tested. 6.5 With respect to 6.4, a different type of fastening device may be used if employed w
45、ith a conventional screw. Other types of fastening devices may be used if investigated for the particular application. A single-threaded nut intended to slip over the edge of sheet metal to receive a retaining screw may be used to secure a cover to an enclosure if: a) The nut is protected against co
46、rrosion by painting, galvanizing, sherardizing, plating, or other equivalent means and b) The threads do not strip when a torque of 30 pound-force-inches (3.4 Nm) is applied. MARCH 2, 2011 DRY-TYPE GENERAL PURPOSE AND POWER TRANSFORMERS - UL 1561 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER R
47、EPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Enclosure 7.1 General 7.1.1 A transformer shall have an enclosure of moisture-resistant material. An iron or steel enclosure shall be protected against corrosion as described in 7.8.1 7.8.3. The enclosure shall house all uninsulated live parts
48、. Exception: A bottom for the enclosure need not be provided for a transformer intended to be pad mounted if the walls will be ush or within 3/8 inch (9.5 mm) of the pad and if the transformer is marked in accordance with 38.10.3. 7.1.2 If a transformer is intended to be mounted on a concrete pad, a
49、luminum parts of an enclosure shall be located at least 1/4 inch (6.4 mm) above the mounting pad. Exception: Aluminum parts of an enclosure coated with a metallic or nonmetallic coating may be in contact with a concrete pad if the coating is protected against corrosion by one of the means described in 8.9 (a), (b), (c), (d), or (e). 7.1.3 An edge, projection, or corner of an enclosure, opening, frame, guard, knob, handle, or the like of a transformer shall be smooth and not sufficiently sharp
