SM 6108 - Ansaldo STS
Contents
1. 7 Ansaldo STS 1000 Technology Drive Pittsburgh PA 15219 yi 645 Russell Street Batesburg SC 29006 S M 61 08 USG A LIGHTNING ARRESTERS E Zvue Low Voltage Model N451552 0101 High Voltage Model N451552 0201 AC Line Model N451552 0401 THIS MANUAL SUPERSEDES SM 6108 DATED OCTOBER 1982 Copyright 2013 SM 6108 Rev 5 89 Ansaldo STS USA Inc May 1989 a 7 Ansaldo STS Notices Proprietary Notice This document and its contents are the property of Ansaldo STS USA Inc formerly known as Union Switch amp Signal Inc and hereinafter referred to as ASTS USA This document is furnished to you on the following conditions 1 That no proprietary or intellectual property right or interest of ASTS USA is given or waived in supplying this document and its contents to you and 2 That this document and its contents are not to be used or treated in any manner inconsistent with the rights of ASTS USA or to its detriment and are not to be copied reproduced disclosed or transferred to others or improperly disposed of without the prior written consent of ASTS USA Important Notice ASTS USA constantly strives to improve our products and keep our customers apprised of changes in technology Following the recommendations contained in the attached service manual will provide our customers with optimum operational reliability The data contained herein purports solely to describe the product and does not cr2. 4 SM 6108 Rev 1 May 1989 a 7 Ansaldo STS Static Specifications 4 STATIC SPECIFICATIONS Table 4 1 shows the expected static operating and breakover voltages of the Low Voltage High Voltage and AC Line Arresters Table 4 1 Operating Specifications for the USG A Lightning Arresters Operating Voltages N451552 0101 32 VDC 25 VAC N451552 0201 250 VDC 175 VAC N451552 0401 140 VAC Breakdown Voltages N451552 0101 75 200 VDC 50 10 VAC 60Hz N451552 0201 500 1300 VDC 350 390 VAC 60 Hz N451552 0401 Not applicable Resistance N451552 0101 gt 10 ohms 32 VDC N451552 0201 gt 10 ohms 100 VDC N451552 0401 gt 5x 10 ohms 120 VAC 5 MAINTENANCE The USG A Lightning Arresters are not serviceable and must be replaced when faulty Also no attempt should be made to clean an arrester otherwise carbon tracking may develop around the air gap s However an arrester may be given several visual and electrical tests to determine whether the unit is faulty When a USG A Lighting Arrester has dissipated a surge the transparent cover may be slightly burnt or singed around the air gap s This does not necessarily indicate a damaged arrester nor will it affect the subsequent operation of the arrester The resistance of a USG A Lightning Arrester may be checked with a power source and an ammeter The procedure is as follows 1 Connect power source ammeter and arrester
3. a 20fF2 5 5 gt 2 8 g Q 2 J E x 5 zZ iL he S x E iL Q 100 g oO S I 8 sot _ 1408 107 106 105 104 103 102 107 1 10 TIME t sec Figure 2 1 Firing Voltage vs Voltage Rise Rate for USG A Low Voltage Arrester shaded area indicates dispersion SM 6108 Rev 1 May 1989 a 7 Ansaldo STS 3 Company Principles of Operation A Finmecca 5000 10 KVL sec 1 kv u sec 100 Vu sec 100 v sec 2000 1000 DC FIRING VOLTAGE FIRING VOLTAGE Volts A A EA 10 102 200 107 106 108 104 103 10 10 1 108 TIME sec Figure 2 2 Firing Voltage vs Voltage Rise Rate for USG A High Voltage Arrester shaded area indicates dispersion 2 3 AC Line Arrester The USG A AC Line Arrester N451552 0401 is constructed by stacking five varistor filled gaps identical to that of the USG A Low Voltage Arrester in series SM 6414 Rev 1 May 1989 7 Ansaldo STS Installation and Application 3 INSTALLATION AND APPLICATION 3 1 Mounting All USG A Lightning Arresters may be wall or shelf mounted Do not mount a unit upside down or on the underside of a shelf The unit may also be mounted horizontally or vertically If mounting vertically position the open end of the cover downwards to prevent accumulation of dust and moisture inside the cover Allow one inch minimum clearance between th
4. of the transient rises The graph of Figure 2 1 shows the range of expected firing voltages for various transient rise rates 2 2 High Voltage Arrester The USG A High Voltage Arrester N451552 0201 is a true air gap arrester Its construction is similar to the low voltage arrester with the exception of an added teflon washer which is used to mechanically hold the gap spacing The assembly consists of brass disk silicon carbide ring teflon washer brass disk The varistor teflon washer provides for a current limited gap in parallel with the gap set by the physical separation of the brass disks When exposed to a high voltage potential the varistor teflon gap breaks over Current is limited by the non linear but resistive action of the varistor material If the potential rise is rapid enough the varistor resistance cannot decrease fast enough or far enough to allow all the energy to be transferred across its teflon gap Therefore the air gap between brass disks breaks down and arc over SM 6414 Rev 1 May 1989 1 a 7 Ansaldo STS Principles of Operation A Finmeccanica Company occurs As with the low voltage type the firing voltage will be dependent on the rate of rise of the leading edge of the transient The graph of Figure 2 2 shows the range of expected firing voltages for various transient rise rates 1000 LIL TT g s gt T3 W w 9
5. ct and application engineers is ready to assist and resolve technical issues concerning this or any ASTS USA product Direct any questions regarding the contents of this service manual to the RAIL team by telephone at 1 800 652 7276 or through Internet e mail at railteam ansaldo sts us SM 6414 Rev 1 May 1989 7 3 7 Ansaldo STS RAIL Team and Technical Support A Finmeccanica Company 2y Ansaldo STS A Finmeccanica Company End of Manual 8 SM 6108 Rev 1 May 1989
6. e open end of the arrester and a flat mounting surface to permit escape of gases 3 2 Wiring To obtain maximum protection wiring should be run first to the arresters and then to the equipment This places the arresters between the exposure and the equipment The primary arresters should be kept as far from the equipment as possible and as near to the expected transient source as possible The common ground bus should be as short and free of bends as practical and should be connected to all housing signal poles and grounds at a particular location Figure 3 1 shows recommended applications for USG A Arresters a SURGE e _ BATTERY RE Big TRACK AC I EQUIPMENT POWER i None RECTIFIER es TO BE oe gt Sa SOURCE ous z AGTE PROTECTED z MAXIMUM B A PARTS NOTES 1 USG A Arrester N451552 0201 High Voltage NOTE A For 240 VAC operation two AC Line w AAR terminal block X451552 0302 Rated Arresters item 4 in series breakdown 500 1300 VDC 2 USG A Arrester N451552 0101 Low Voltage NOTE B Surge ripple filter should be used if battery W AAR terminal block X451552 0301 rated ripple exceeds 5 breakdown 75 200 VDC 3 Surge ripple Filter N451036 0702 Up to 2 5 amp load 4 USG A Arrester N451552 0401 AC Line w AAR terminal block X451552 0306 Figure 3 1 AFO System Basic Signal Diagram End Fed
7. eate any warranties Within the scope of the attached manual it is impossible to take into account every eventuality that may arise with technical equipment in service Please consult an ASTS USA local sales representative in the event of any irregularities with our product ASTS USA expressly disclaims liability resulting from any improper handling or use of our equipment even if these instructions contain no specific indication in this respect We strongly recommend that only approved ASTS USA spare parts are used as replacements SM 6414 Rev 1 SM 6108 i Ansaldo STS Revision History Revision History October 1982 Original Issue Revisions were not numbered only dated ii SM 6108 Rev 1 May 1989 7 Ansaldo STS NOash Table of Contents GENERAL INFORMATION ccccccsseeeecesseneeeeseeneeeeseeneeeeseeeeeeesecneeeeseeneeenseeneeenees 1 1 814 00 6 01k 0 nnn PRINCIPLES OF OPERATION oocciisceccccsssececs istdcngesesececdisseceeitesteved issecreeteseeedissccee 2 1 Low Voltage Arrestar s ssnisradisns darnie a a TAARA aa A 2 2 High Voltage ArreSter si ii cccsicecccsvscec ccdicencievsceecesvadenedessee cevicagecdedscceeeevaenaeevs 2 3 AGC Line Anrester oeren ATEA INSTALLATION AND APPLICATION ccsseccesesseeeeseseeeeeeeseeeeeeesneeeeeeseaneeeeeeaes Ses MUn ecserin Atti Matai adieetieiendi eitniedieetinedt Dili AN otic ctieieed seuss pee A cd dada podnd sade adecudetdddeeues A STATIC SPECIFICATIONS
8. in series 2 Turn on power source and adjust as follows 32 VDC for unit N451552 0101 1V00 VDC for unit N451552 0201 120 AC for unit N451552 0401 3 The ammeter should read as follows Unit N451552 0101 less than 32 0 milliamps Unit N451552 0201 less than 0 1 microamps Unit N451552 0401 less than 25 0 milliamps SM 6414 Rev 1 May 1989 5 Part Number List 6 PART NUMBER LIST See front cover for photos A Th Ansaldo STS Description ASTS USA Part Number Low Voltage USG A Lightning Arrester 32 VDC 25 VAC blue lettering N451552 0101 High Voltage USG A Lightning Arrester 250 VDC 175 VAC red lettering N451552 0201 AC Line USG A Lightning Arrester 140 VAC yellow lettering N451552 0401 Low Voltage USG A Lightning Arrester mounted on AAR terminal block X451552 0301 High voltage USG A Lightning Arrester mounted on AAR terminal block X451552 0302 AC Line USG A Arrester mounted on AAR terminal block X451552 0306 SM 6108 Rev 1 May 1989 N Ansaldo STS A Finmeccanica Company RAIL Team and Technical Support 7 RAIL TEAM AND TECHNICAL SUPPORT The Rapid Action Information Link RAIL team created in 1996 serves the technical needs of current and potential ASTS USA customers Convenient 24 hour access and a rapid resolution to customer problems are the trademarks of this organization The RAIL team which is staffed primarily by ASTS USA produ
9. und voltage transients to levels below that of equipment destruction They are provided as standalone units or mounted on an AAR terminal block 2 PRINCIPLES OF OPERATION 2 1 Low Voltage Arrester The USG A Low Voltage Lightning Arrester N451552 0101 consists of a silicon carbide varistor ring sandwiched between two brass disks Electrically the varistor is in series with the brass disks but in parallel with the air gap spacing of the brass disks This is referred to as a varistor filled gap arrester The varistor acts as a non linear resistor whose resistance gets lower with more applied voltage With this behavior the arrester is quite effective at bleeding off electrostatic charge and limiting the peak level of surge voltages NOTE The difference between surge and transient is time Surges are classically defined as having a duration of greater than 8 3 mseconds and transients less than 8 3 mseconds In the transient case the arrester behaves a little differently The change of resistance with respect to time becomes slower than the rising level of voltage with respect to time which is seen across the arrester At some point this voltage becomes high enough fast enough to jump the varistor filled gap and thus you have an arc over condition For this reason the static and dynamic breakdown of this or any other varistor based arrester are entirely different The difference is determined by how rapidly the leading edge
10. wc ciccscccisccsecctepetieede erates tects ee neta ele dk eee eee de eee MAINTENANGE i ofociicccccceze feeceusdcectensececccsscccectuitiveccecctecdeniscdescsuteeectuicieusestttertensasee PART NUMBER ELISU cisccicccstescie cise scicetiescsecdeecdacentescie chtvedieentencie chavedacenteueaecdtectaee RAIL TEAM AND TECHNICAL SUPPORT cccccssetesesseeeeseseeeeeeeseeneeeesneneeeesees List of Figures Figure 2 1 Firing Voltage vs Voltage Rise Rate for USG A Low Voltage Arrester shaded area indicates dispersion ecceeceeeeeeeeeeeeeeeeeeeeeeeeeeteeeeeeenaeees Figure 2 2 Firing Voltage vs Voltage Rise Rate for USG A High Voltage Arrester Figure 3 1 AFO System Basic Signal Diagram End Fed Table 4 1 Operating specifications for the USG A Lightning Arresters shaded area indicates dispersion 0 0 00 eecceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeenaeees List of Tables SM 6414 Rev 1 May 1989 Table of Contents AV Ansaldo STS Table of Contents A Finmeccanica Company a 7 Ansaldo STS A Finmeccanica Company iv SM 6108 Rev 1 May 1989 a 7 Ansaldo STS General Information 1 GENERAL INFORMATION 1 1 Introduction This manual describes the principle of operation application and testing of the USG A E Zvue Lightning Arresters These include the low voltage high voltage and AC line arresters These arresters are designed to limit transverse line to line and longitudinal line to gro
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