1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 347A Medium Voltage Power Conversion EquipmentUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED
2、 FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Medium Voltage Power Conversion Equipment, UL 347A First Edition, Dated September 8, 2015 Summary of Topics This is the rst edition of the Standard for Medium Voltage Power Conversion Equipment, UL 347A.
3、The new requirements are substantially in accordance with Proposal(s) on this subject dated March 20, 2015 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 oth
4、erwise without prior 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
5、, indirect or similar 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
6、for any damage ever 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 reasona
7、ble attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. SEPTEMBER 8, 2015 UL 347A tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER
8、8, 2015 UL 347A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 8, 2015 1 UL 347A Standard for Medium Voltage Power Conversion Equipment First Edition September 8, 2015 This ANSI/UL Standard for Safety consi
9、sts of the First Edition. The most recent designation of ANSI/UL 347A as an American National Standard (ANSI) occurred on September 8, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages and Title Page. Comments or proposals for revisions on any part of the Standard
10、 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 copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All
11、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 347A-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION
12、FROM UL SEPTEMBER 8, 2015 MEDIUM VOLTAGE POWER CONVERSION EQUIPMENT - UL 347A 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .6 2 Glossary .6 3 Components 10 4 Units of Measurement 10 RATI
13、NG 5 General .10 CONSTRUCTION 6 General .11 7 Enclosure .11 7.1 General 11 7.2 Ventilation openings .11 7.3 Environmental rating related enclosure requirements 12 7.4 Protection against corrosion 13 8 Arrangement of Components 13 9 Guarding and Accessiblity of Live Parts 13 10 Grounding and Bonding
14、.14 11 Protective Devices 14 12 Overload Relays 16 13 Isolating Means .16 14 Interlocking 17 15 Automatic Restarting 18 16 Internal Wiring 19 17 Voltage Dividers .19 18 Terminals and Connections .20 19 Spacings 20 19.1 General .20 19.2 Circuits connected to the medium voltage line .21 19.3 Circuits
15、isolated from the medium voltage line .22 19.4 Insulating material used as a barrier in lieu of spacings .26 19.5 Clamped insulating joints in lieu of spacings .26 20 Means for Switching 26 21 Capacitors .26 22 Control Circuits .27 23 Bypass Circuits .28 23.1 Bypass contactors rated 15 kV and less 2
16、8 23.2 Bypass Circuits Rated Over 15 kV .29 24 Gate Drive Circuits 29 25 Transformers, Reactors, and Voltage Sensing Devices 30 26 Cord-Connected Programming and Diagnostic Units 30 27 Accessories 31 28 Cooling Systems 31 SEPTEMBER 8, 2015 MEDIUM VOLTAGE POWER CONVERSION EQUIPMENT - UL 347A 3UL COPY
17、RIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 29 General 32 30 Temperature Test .33 30.1 General .33 30.2 Test conditions .35 31 Dielectric Voltage-Withstand Test .39 31.1 General .39 31.2 Meters 40 31.3 Test procedure .40 32 Switchin
18、g Capability Test - Isolating Means 40 33 Short Circuit Interruption Test 41 33.1 General requirements .41 33.2 Interruption ratings .42 33.3 Branch circuit short circuit protection requirements .45 34 Impulse Withstand Test 46 34.1 General .46 34.2 Impulse voltage withstand test methods .47 34.3 Ev
19、aluation .47 35 Calibration Tests Overload 48 36 Solid State Motor Protection Tests 48 36.1 Solid state motor overload protection test .48 36.2 Thermal memory retention test (shutdown) 49 36.3 Thermal memory retention test (loss of power) .49 36.4 Speed sensitivity test .50 37 Operation Tests 50 37.
20、1 General .50 37.2 Single phasing .51 37.3 Inoperative blower motor 51 37.4 Clogged lter 51 37.5 Current limiting control 51 37.6 Loss of cooling medium circulation test .52 37.7 Acceptance criteria .52 38 Hydrostatic Pressure Test .53 39 Breakdown of Components Test 53 40 Mechanical Operation and I
21、nterlock Integrity Test .56 41 Accessory Installation Test .56 MARKINGS 42 General 57 43 Overload, Overcurrent, Overtemperature, and Overspeed Protection Markings .60 44 Branch Circuit Short Circuit Protection Markings 61 45 Cautionary Markings 62 46 Instructions and Markings Pertaining to Enclosure
22、s .62 46.1 Permanence of marking .62 46.2 Details 63 47 Instructions and Markings Pertaining to Accessories 63 MANUFACTURING AND PRODUCTION LINE TEST 48 Burn-In and Diagnostic Tests .64 SEPTEMBER 8, 2015 MEDIUM VOLTAGE POWER CONVERSION EQUIPMENT - UL 347A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
23、FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APPENDIX A SEPTEMBER 8, 2015 MEDIUM VOLTAGE POWER CONVERSION EQUIPMENT - UL 347A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cov
24、er enclosed medium voltage power conversion equipment, such as variable frequency controllers, that control and transfer power to motors. These requirements also cover power-supply modules, input/output modules, and electronic assemblies, for use in or with power conversion equipment. 1.2 These requ
25、irements cover equipment rated above 1500 volts to 38kV. 1.3 These requirements do not cover equipment for use in hazardous locations as dened by the National Electrical Code, NFPA 70. 1.4 These requirements do not cover solid state reduced voltage motor controllers (soft starters). 1.5 These requir
26、ements do not cover low voltage power conversion equipment rated 1500 volts and below. This type of equipment is covered by the Standard for Power Conversion Equipment, UL 508C or the Standard for Adjustable Speed Electrical Power Drive Systems - Part 5-1: Safety Requirements - Electrical, Thermal a
27、nd Energy, UL 61800-5-1. 2 Glossary 2.1 For the purpose of this document, the following denitions apply. 2.2 AMBIENT TEMPERATURE The temperature of the air medium into which the heat of the equipment is dissipated. See 30.1.3. 2.3 BUS A conductor, or group of conductors, that serve as a common conne
28、ction for two or more circuits. 2.4 BUS, HORIZONTAL A bus that extends through a vertical section, that is intended to connect to another vertical section, that may be provided in the future. 2.5 BUS, VERTICAL A bus that connects one or more controllers in a vertical section together. Where the asse
29、mbly also contains a horizontal bus, the vertical bus connects the controllers in a vertical section to the horizontal bus. 2.6 BYPASS CIRCUIT A circuit, typically consisting of a switch or contactor, that when closed, creates an alternate path for current ow in parallel with the circuit being bypas
30、sed, allowing the original circuit to be turned off while maintaining current ow to the load. 2.7 CONTACTOR A two-state (ON-OFF) device for repeatedly establishing and interrupting an electric power circuit. 2.8 CONTACTOR, AIR-GAP A contactor that introduces a gap (in air) between contacts to interr
31、upt a circuit. SEPTEMBER 8, 2015 MEDIUM VOLTAGE POWER CONVERSION EQUIPMENT - UL 347A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.9 CONTACTOR, SOLID-STATE A contactor that introduces a high impedance to interrupt a circuit. Typical sol
32、id-state contactors use silicon controlled rectiers (SCR) or insulated gate bipolar transistors (IGBT) as the switching device(s). 2.10 CONTACTOR, VACUUM A contactor that introduces a gap between contacts (located in a vacuum) to interrupt a circuit. 2.11 CONTROL CIRCUIT A circuit that carries the e
33、lectric signals directing the performance of a controller, and that does not carry the main power circuit. A control circuit is generally limited to 15 amperes or less. 2.12 CONTROLLER A device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to t
34、he apparatus to which it is connected. 2.13 COVER An unhinged portion of an enclosure that covers an opening. 2.14 DOOR A hinged portion of an enclosure that covers an opening, that is intended to be opened during routine maintenance, operations and adjustments. 2.15 ENCLOSURE A surrounding case des
35、igned to protect: a) Personnel against injury due to accidental contact with electrical or moving mechanical parts of the enclosed device(s), and b) Internal device(s) against specied external conditions. 2.16 FAULT CURRENT A current that results from the loss of insulation between conductors or bet
36、ween a conductor and ground. 2.17 GALVANICALLY ISOLATED SECONDARY CIRCUIT A circuit having no direct electrical connection to a medium voltage circuit, with isolation between the circuits obtained by the use of transformers or optical isolation. 2.18 INTERLOCK A device that prevents operation of som
37、e other device with which it is directly associated under specic conditions. Interlocks may be electrical, mechanical, or a combination of both. 2.19 INTERLOCK, MECHANICAL An interlock that performs its function solely by mechanical means. 2.20 ISOLATED SECONDARY CIRCUIT A circuit derived from an is
38、olating source (such as a transformer, optical isolator, voltage divider or electro-mechanical relay) and having no direct connection back to the primary circuit. 2.21 ISOLATING MEANS A mechanical switching device that provides, in the open position, isolating distance in the main circuit, from the
39、source of power. 2.22 LOW VOLTAGE Voltage of 1500 V or less. Note: The National Electrical Code, NFPA 70 denes low voltage to be voltages of 1000 V or less. SEPTEMBER 8, 2015 MEDIUM VOLTAGE POWER CONVERSION EQUIPMENT - UL 347A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTR
40、IBUTION WITHOUT PERMISSION FROM UL 2.23 LOW VOLTAGE SECTION (of a voltage divider) That portion of a voltage divider where a small fraction (no greater than 1500 V total) of the input voltage is present during normal operation. 2.24 MEDIUM VOLTAGE Voltage greater than 1500 V, up to and including 38
41、kV. Note: National Electrical Code, NFPA 70 denes any voltage above 1000 V as High Voltage. 2.25 OVERCURRENT Overcurrent is a current in excess of the continuous rated current. 2.26 PANEL, HINGED A portion of an enclosure that has hinges, but no hand-operable latching system, secured in the closed p
42、osition by multiple bolts or other hardware requiring a tool other than a key to operate. Note: Hinged panels are not intended to be opened during normal operation, routine adjustment or simple maintenance operations such as replacement of fuses. 2.27 PHASE LEAST LIKELY TO STRIKE GROUND A phase that
43、 is referenced to ground or by virtue of its position, potential, or both, relative to other phases of the device is dened as less likely than any other phase to strike ground. In a three phase device, this phase is usually the center phase. It is possible for several phases to be equally likely to
44、strike to ground. 2.28 POLLUTION DEGREE1N opollution or only dry, nonconductive pollution occurs. The pollution has no inuence. 2.29 POLLUTION DEGREE 2 Normally, only nonconductive pollution occurs; however, temporary conductivity is expected when equipment is out of operation. 2.30 POLLUTION DEGREE
45、 3 Conductive pollution occurs, or dry, nonconductive pollution occurs that becomes conductive due to condensation that is expected. 2.31 PRIMARY CIRCUIT A circuit in which the wiring and components are conductively connected to the branch circuit. 2.32 PRIMARY SECTION (of a voltage divider) That po
46、rtion of a voltage divider where a large fraction of the input voltage is present during normal operation. 2.33 PROTECTION, OVERLOAD A protective device or circuit that detects excessive current, (not necessarily short-circuit current) and functions to cause interruption or limitation of the ow of c
47、urrent through the protected device or circuit. 2.34 PROTECTION, OVERVOLTAGE A protective device or circuit that detects excessive voltage and functions to interrupt power or reduce voltage to the protected device or circuit. 2.35 RATING A designated limit of operating characteristics based on denit
48、e conditions. Operating characteristics such as current, voltage, frequency, and other characteristics comprise the rating. SEPTEMBER 8, 2015 MEDIUM VOLTAGE POWER CONVERSION EQUIPMENT - UL 347A 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM U
49、L 2.36 RELAY, OVERLOAD A relay that functions at a predetermined value of overcurrent to provide a signal or to result in disconnection of the load from the power supply, or both. An overload relay is intended to protect the motor branch circuit conductors, the motor control apparatus, and the motor against overcurrent. It does not necessarily protect itself. 2.37 REVERSING Reversing is a control function that provides for changing operation of the con
