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2、tence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no cir
3、cumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations shall be addressed to the secr
4、etariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard n
5、o later than fwe years from the date of approval. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by National Electrical Manufacturers Association 1300 N. 17th Street, Rosslyn, Virgi
6、nia 22209 Copyright O 1996 National Electrical Manufacturers Association All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher. Printed in the United States of America COPYRIGH
7、T National Electrical Manufacturers AssociationLicensed by Information Handling Services STD-NEMA C93.3-ENGL 1995 b1i7U247 0514723 3b1 ANSI C93.3-1995 CONTENTS 1 2 3 4 5 6 7 Annex A . Appex B . Page Scope . 1 Normative references 1 Definitions . 1 Service conditions 3 Ratings . 5 Manufacturing requi
8、rements 19 Measurement of losses at power frequency 22 Testing . 9 Guide for emergency overload current capability of line traps 21 Annex C . Terminal orientation . 23 i COPYRIGHT National Electrical Manufacturers AssociationLicensed by Information Handling ServicesANSI C93.3-1995 Foreword (This For
9、eword is not patt of American National Standard C93.3-1995) This document was developed by Standards Committee C93, on Power-Line Carrier Equipment and Coupling Capacitor Voltage Transformers. During its development the standard received the benefits of a consensus of input from a balanced group rep
10、resenting the consumer, producer, and general-interest viewpoints. These inputs were harmonized and integrated into the standard in its present approved form. Standards Committee C93 was established to coordinate, review, and update the existing documents into an effective group of American National
11、 Standards, including this standard for line traps. A Separate standard will be developed to cover each type of equipment described in the Committees scope. This standard includes technical definitions, performance ratings, testing methods and manufacturing requirements for line traps. It is related
12、 to ANSI C93.1-1990, ANSI C93.4-1990. Suggestions for improvement of this standard are welcome. They should be sent to: Secretary, ANS C93, Power-Line Carrier National Electrical Manufacturers Association 1300 N. 17th Street, Suite 1847 Rosslyn, Virginia 22209 This standard was processed and approve
13、d for submission to ANSI by Accredited Standards Committee C93 on Power-Line Carrier Equipment and Coupling Gapacitor Voltage Transformers. Committee approval of this standard does not necessarily imply that all committee members voted for its approval. At the time it approved this standard, the C93
14、 Committee had the following members: W. Seamon, Chairman M. Holsinger, Secretary Organkation Represented Edison Electric Institute Institute of Electrical for further information refer to Appendix A2. 5.1.4 Main coil inductance The rated inductance of the main coil in mH shall be one of the followi
15、ng: 0.265, 0.53, 1.06, 1.59,2.12, 2.65. Other ratings of inductance may be specified based on agreement between manufacturer and purchaser. Note-For reference, the following nominal 60-Hz reactance values, in ohms, are given corresponding to the above rated inductances as 0.1,0.2,0.4,0.6,0.8,1.0, re
16、spectively. 5 COPYRIGHT National Electrical Manufacturers AssociationLicensed by Information Handling Services, STD-NEMA C73.3-ENGL I1775 b470247 0514730 5TL W ANSI C93.3-1995 Insulation Temperature Index 105 130 155 5.1.5 Temperature rise at rated continuous current Maximum Temperature Rise (Degree
17、s Celsius) Hottest Spot Average Winding (by Thermocouple) (by Resistance) 85 65 110 90 135 115 Since a line trap is usually not fully loaded during all its working life, the values given in table 6 are higher than those given in dry-type reactor publications. For special and non-conventional install
18、ations, appropriate units must be requested. Insulation Temperature Index 105 130 155 The maximum temperature rise above the 40C 24-hour mean ambient temperature at rated continuous current shall not exceed those values in table 6. Actual Limiting Temperature (Degrees Celsius) 205 285 31 5 180 I 160
19、 I 140 I 5.1.6 The line trap shall withstand the heating effects of the rated short-time current for two seconds without exceeding the temperature given in table 7, and as determined in accordance with 6.2.3. Other short-time current durations may be specified based on agreement between manufacturer
20、 and purchaser. Limiting temperature for rated short time current Table 7 - Limiting temperature for rated short-time current 5.1.7 Mechanical strength for rated short-time current The line trap shall be capable of withstanding the mechanical forces produced by an offset current having a single peak
21、 with a value of 2.55 times the rated short-time current. The term “capable of withstanding“ shall be interpreted to mean that if subjected to this duty the line trap shall show no damage and shall be capable of meeting all other requirements of this standard. 5.1.8 Protective device voltage rating
22、The voltage rating of the protective device shall be no less than “E,“ the voltage developed across the line trap with rated short-time current, determined as follows: E = 1.1 x 2%fLp IKN Where: f = power frequency (hertz) I, = apparent power-frequency inductance (henries) of the main coil I, = rate
23、d short-time current (amperes) 6 COPYRIGHT National Electrical Manufacturers AssociationLicensed by Information Handling ServicesSTD-NEMA C93.3-ENGL 1775 b470247 053i733 i38 111 ANSI C93.3-1995 System Voltage (kv The protective device shall meet the requirements of ANSIAEEE C62.11 for its classifica
24、tion and voltage rating. Radio-lnf luence Maximum Radio- 5.1.9 Main coil insulation level The insulation level for the main coil shall be at least 30% above the value of the maximum 200kV/microsecond front-of-wave protective voltage or of the 20 kA discharge voltage of the protective device, whichev
25、er is higher. 5.1.10 Radio influence voltage (RIV) The radio influence voltage of a line trap shall not exceed the value stated in table 8, when the line trap is applied at the stated maximum system voltage. Table 8 - Radio influence voltage 36.2 48.3 72.5 121 145 169 242 362 550 800 34.5 46 69 115
26、138 161 230 345 500 765 21 28 42 70 84 98 140 209 31 7 462 125 125 125 250 250 250 250 250 500 750 The maximum and nominal system voltages are from American National Standards C84.1 and C92.2. The radio-influence test voltage is the line-tc-ground value of the maximum system voltage. The maximum per
27、missible background voltage level will be 1/2 of the radio-influence voltage rating. Correction for background voltage level shall be by the rms method. These maximum radio-influence voltages, as conducted radio noise, will add a negligible amount to the radio noise normally radiated from the line,
28、even at short distances from the line trap. * t 5.1.1 1 Tensile strength A line trap intended for vertical suspension mounting shall be capable of withstanding, without yielding, a tensile force of not less than 3,000 pounds (13,300 N), in addition to the weight of the line trap. 5.1.12 Self-resonan
29、t frequency This frequency shall always be higher than 500 kHz except for line traps where it may not be possible to achieve such a high frequency because of the physical size and construction of the main coil. For these special cases the self-resonant frequency must be greater than the GMF of the o
30、perating bandwidth. 7 COPYRIGHT National Electrical Manufacturers AssociationLicensed by Information Handling Services _ STD-NEMA C93.3-ENGL 1995 D b470247 0514732 374 ANSI C93.3-1995 Type of Tuning Single-f requency Two-f requency Wide-band 5.2 Ratings for tuned type line traps Tuning Ranges (Wz) 3
31、0-90 70-200 100-300 30-90 70-200 100-300 50-200 100-300 5.2.1 Types of tuning The types of tuning shall be as follows: 1) Single-frequency (Field-adjustable or factory-fixed) 2) Two-frequency (Field-adjustable or factory-fixed) 3) Wide-band (Field-adjustable or factory-fixed) 4) Self-tuned wide-band
32、 5.29 Tuning 5.2.2.1 Tuning ranges for field adjustable line traps Tuning ranges for a line trap that is adjustable in the field are given in table 9, and are the ranges through which the resonant frequencies (for single- and two-frequency line traps) or geometric mean frequencies (for wide-band lin
33、e traps) may be tuned. NoteThe indicated tuning ranges in table 9 do not preclude the use of frequency combinations from two tuning ranges in a two-requency line trap. A line trap having an inductance greater than 0.265 mH is generally not field-adjustable. This is because high inductance line traps
34、 are normally used for factory-fixed wide-band or seif-tuned wideband operation. Table 9 -Tuning ranges for 0.265 mH field adjustable line trap 5.2.2.2 Tuning range for factory-fixed wide-band line traps A factory-fixed wide-band line trap shall have a bandwidth within the 30 to 500 kHz range, which
35、 is not adjustable in the field. 5.2.2.3 Frequency separation of a two-frequency line trap For a two-frequency line trap, the frequencies shall be separated by at least 25 kHz or 25 percent of the higher frequency, whichever is greater. 5.2.2.4 Precision of tuning A single- or two-frequency line tra
36、p shall be capable of being tuned to a selected frequency or frequencies within the specified range with an accuracy off 0.5 percent. a COPYRIGHT National Electrical Manufacturers AssociationLicensed by Information Handling Services5.2.3 Rated blocking impedance For a single- or two-frequency line t
37、rap the rated blocking impedance shall be 400 ohms. For a field adjustable wide-band line trap, the rated blocking impedance shall be 400 ohms or 600 ohms or 1,000 ohms or configured for any of these impedances as agreed between the manufacturer and purchaser. For a factory fixed wide-band line trap
38、, the rated blocking impedance shall be 400 ohms or 600 ohms or 1,000 ohms. 5.2.4 Variation of blocking characteristic with change in ambient temperature and change in continuous current 5.2.4.1 Single- and two frequency tuning The resonant frequency shall not vary more than a total of two percent f
39、or changes in both the ambient temperature and the continuous current within the temperature range of -40C to +45“C, and from zero to rated continuous current. 5.2.4.2 Wide band tuning For the field-adjustable type, the geometric mean frequency shall not vary more than a total of two percent for cha
40、nges in both the ambient temperature and the continuous current within the temperature range of -40C to +45“C, and from zero to rated continuous current. For the factory-fixed type, the minimum blocking impedance over the bandwidth shall be maintained for changes in both the ambient temperature and
41、the continuous current within the temperature range of -40C to +45“C, and from zero to rated continuous current. 5.2.5 Auxiliary protective device rating Auxiliary protective gaps shall neither spark over nor continue to spark over following transient voltage actuation, with the power frequency volt
42、age, “E,“ as determined in 5.1.8, across the main coil. 5.2.6 Tuning device insulation level The insulation level for the tuning device shall be at least 30 percent above the value of the maximum 200kV/microsecond front-of-wave protective voltage or of the 20 kA discharge voltage of the protective d
43、evice, whichever is higher. The insulation level for the tuning device components protected by an auxiliary protective device shall be at least 30% above the impulse sparkover voltage determined in 6.2.13(1). 6 Testing 6.1 General 6.1.1 Test conditions 1) The ambient temperature range shall be from
44、+1O“C through +50“C. 9 COPYRIGHT National Electrical Manufacturers AssociationLicensed by Information Handling Services2) The line trap for application at an unusual altitude service condition may be tested at any altitude less than 3300 feet (1000 meters) if appropriate altitude corrections from ta
45、bles 2,3 and 4 are applied. 3) The line trap for application at a usual altitude service condition may be tested at any altitude higher than 3300 feet (1000 meters) if appropriate attitude corrections from tables 2,3, and 4 are applied. 4) The test units shall be new and in clean, dry condition. 5)
46、The sequence of testing shall be optional, except where otherwise noted. 6.1.2 Design tests 6.1.2.1 General The following design tests shall be performed by the manufacturer on one line trap of each current and inductance rating to ensure that its characteristics and performance meet the requirement
47、s of this standard: Measurement of main coil inductance (see 6.2.1) Temperature rise at rated continuous current (see 6.2.2) Calculation of time to reach limiting temperature for rated short-time current (see 6.2.3) Tensile strength test for suspension mounted line traps (see 6.2.4) Mechanical stren
48、gth for rated short-time current (see 6.2.5) Turn-to-turn insulation test of the main coil (see 6.2.6) Protective device tests (see 6.2.7) Radio-influence voltage test (see 6.2.8) Self-resonant frequency test (see 6.2.9) 6.1.2.2 Tuned type The following additional design tests shall be performed by
49、the manufacturer on one tuned-type line trap of each current and inductance rating to ensure that its tuning characteristics and performance meet the requirements of this standard: 1) Bandwidth test (see 6.2.10) 2) Variation of blocking characteristics with change in ambient temperature and change in continuous current (see 6.2.1 1) 3) Power Frequency Test of protective device and auxiliary protective device(s) (see 6.2.1 2) 4) Insulation tests of the tuning device components protected by auxiliary protective device(s) (see 6.2.1 3) 5) Insulation test of an assembled
