本标准规定了一般中小型旋转电机的安全要求。本标准不适用于宇航电机、牵引电机、防暴电机及起重冶金电机和屏蔽电机。本标准应与GB 7251.4-2005一起使用。 GB 14711-2006 中小型旋转电机安全要求 GB14711-2006 标准下载解压密码：www.bzxz.net

ICS29.160.01
NationalStandardofthePeople'sRepublicofChinaGB14711-2006
SubstituteforGB14711-1993
SafetyRequirements of Small and Medium SizeRotatingElectrical MachinesIssued onAugust25,2006
Issued by
Effective fromMarch1,2007
General Administration of Quality Supervision, Inspection and Quarantine of the P.R. ChinaStandardizationAdministrationofthePeople'sRepublicofChinaForeword.
2 Normative sources of standards.3 Technical terms and explanations.4Generalrequirements
5Structure
6Symbols.
Contents
8 Low voltage (rated voltage≤1, 0ooV)ACmotor (including universal motor)..9Highvoltage(ratedvoltage>l,oooV)ACmotor1oDCmotor.
HPortableandauxiliarygeneraton12Variable-frequency&adjustable-speedmotor.GB14711-2006
Foreword
All thetechnical contentof thestandard is compulsoryGB14711-2006
The standard is consistent with the safety requirements in GB755-2000RotatingMachineRatingand Performance.Thestandard is a substitute forGB14711-1993 General Safety Requirements of Small and Medium RotatingElectrical Machines, with the presenttitleSafety Requirements of Smalland Medium SizeRotatingElectrical Machines.ThestandarddiffersfromGB14711-1993mainlyinthefollowingrespects:Standardwasrearranged;
The safety requirements of portable, auxiliary, and variable-frequency & adjustable-speed motors wereincluded;
3.TablesrelatedwereplacedatthebackofthisbookforeasyreferenceThestandard isproposedbyChinaElectricalEquipmentIndustryAssociationThe preparation and management of standard is under the supervision of the China Rotating Electrical MachineStandardization&TechnologyCommittee(SAC/TC26).Shanghai Electrical Equipment Research Institute was responsible for the drafting of the standard. Otherorganizations that participated in the drafting include:Beijing B.J.Electric Motor Co., Ltd., Chongqing SailimengElectric Motor Co.,Ltd., Shandong Qilu Electric Motor Manufacturing Co., Ltd., Lanzhou Electric Motor Co., Ltd..Shanghai United Electric Motor (Group) Corporation, Zhejiang Jinlong Electric Motor Co.,Ltd., Shandong HualiElectric Motor Co.,Ltd., Jiangsu Qingjiang Electric Motor Co.,Ltd., Kunming Electrical Engineering Co., Ltd., andShanxiElectricMotorManufacturingCo.,Ltd.Major drafters includeNiLixin, ChenWeihua,JinWeiwei, LiBaojin,LiXiuying,Zhang Shengde,Liu Jinyan,CaiJiagang, Zhou Qi, Tian Zhigang, Gao Wen'an, Cui Huajian, Ye Jinwu, Feng Jinquan, Zhou Guobao, Zhang Bin and YueWeiping
The standard shall replace GB 14711-1993 from the effective dateGB14711-1993is thefirstedition.This standard is thefirstamendmentⅢ
GB14711-2006
SafetyRequirements of Small and MediumSizeRotatingElectricalMachines1Scope
1.1The standard specifies the safety requirements of small/medium general-purpose rotating electrical machines(electric motorand generator,hereinafterreferred to as“motor\).1.2 This standard is not applicable to astronautic motors, traction motors, explosion-proof motors, hoist andmetallurgical motors, shield motors.Tests of small power motors produced according to GB/T 5171 can also refer toGB12350.
1.3 In case other types of motors involve special requirements that are not covered in this standard, new standard shouldbedeveloped.
Normative sources of standardsThe terms and conditions quoted from the following documents became the terms and conditions of this standardWhere documents are dated, their attached modification list (exclusive of corrections) or the revised edition is notapplicable to this standard. Nevertheless, the concerned parties are encouraged to consider the latest editions of thosedocuments when reaching agreement based on this standard. Where documents are undated, their latest versions areapplicable to this standard.GB755-2000RotatingelectricalmachinesRatingandperformance(idtIEC60034-1:1996)GB/T825-1988Eyescrew(NEQISO3266:1984)GB1971Rotating electrical machinesCableterminal symbol and sense of rotation(GB1971-2006,60034-8:2002,IDT
GB/T 2423.4-1993 Electrical and electronic products environmental tests proceduresTests Db:temperature &humiditytestingmethods(eqvIEC60068-2-30:1980)GB/T4207-2003CTI and PTI testing methods for solid insulation material under humid conditions (IEC 60112:1979,IDT
GB4706.1-1998 House and similar purpose appliances safetyPart one: general requirements (eqv IEC 60335-1:1991)
GB/T4942.1-2001 Rotating electrical machine housing protection grading (IP code) (idt IEC 60034-5: 1991)GB/T5169.11-1997Electrical and electronic products fire hazard testsTesting methodsGlowwire test andguidelinesforthefinished products(idtIEC60695-2-1/1:1994)GB/T5169.12-1999Electrical and electronic productsfirehazard testsTesting methodsGlowwire flammabilitytest for materials (idt IEC 60695-2-1/2: 1994)GB/T 5465.2-1996 Electrical equipment diagrams and symbols (idt IEC 60417: 1994)GB/T 11020-1989 Flammability testing methods for solid insulation material exposed to ignition source (eqv IEC60707:1981)
GB/T13002Built-in thermal protectorofrotating electricalmachinesRotating electrical machines protectionrules(GB/T13002-1991,eqvIEC34-11-1:1978)GB/T 16422.2-1999 Testing methods of exposure to laboratory light sources for plastics Part two: xenon-arc lamp(idtISO4892-2:1994)
GB/T 17948.1-2000 Rotating electrical machines insulation performance appraisal Random windings testproceduresThermal appraisal and grading (idtIEC 60034-18-21:1992)GB/T18380.1-2001Burningtestfor cables exposed toflamesPart1:verticalburningtestof single insulatedwireorcable(idtIEC60332-1:1993)
GB/T18380.2-2001 Burning test for cables exposed to flamesPart 2:vertical burning test of single insulated thincopper-corewire orcable(idtIEC60332-2:1989)GB/T18380.3-2001Burning test for cables exposed to flamesPart 3:burning test of bunched wires or cables (idtIEC60332-3:1992)
JB/T 7589-1994 High-voltage electrical machines insulation thermal stability appraisal methods (eqv IEC60034-18-31:1992)
GB 14711-2006
JB/T8158-1999Startingperformanceof single-speed,three-phase,squirrel-cage inductionmotors(voltage≤690V)(eqvIEC 60034-12:1995)
JB/T10098-2000 Impulse-voltageenduranceofACmotorstatorcoils(idtIEC60034-15:1995)IEC 60034-18-22: 2000 Rotating electrical machine insulation function appraisalFormed winding testprocedures—Insulation compositions substitution and change gradingIEC 60034-18-31:1992 Rotating electrical machine insulation function appraisalFormed winding testproceduresInsulation's thermal property appraisal and gradingfor motors≤50MVA and 15kVIEC 60034-18-32:1995 Rotating electrical machine insulation function appraisalFormed winding testprocedures—Insulation's electric property appraisal and gradingfor motors≤50MVAand15kV3
TechnicaltermsandexplanationsThefollowing terms andexplanations are applicable to this standard.3.1Clearance
Clearance is the shortest distance between two conductive parts measured through air.3.2Creepagedistance
Creepageis the shortestpath between two conductive parts measured along the surface of the insulationNote:the seam between two insulating parts is taken as a part of the surface3.3Lead
Lead is a wire that connects between winding coils and wiring terminals, or between winding coils, or betweenwinding coils and other conductors inside the motor. Leads can be directed into a junction box outside the motor.3.4Supplycord
It isthe flexible cord that goes from inside themotorto the outside forthe purpose of power supply4General requirements
4.1Themotorscovered inthis standard should conformtotherequirements ofGB755-2000.4.2Thecapacitorintegratedwiththemotorisregardedaspartofthemotor.4.3 Whether at room temperatures, or thermal state, or humid conditions, motors should have adequate insulationresistance.Insulation resistance is measured and tested according to the requirements of 7.4.4.4 In normal operation, motors should not have electrical or mechanical faults that would affect safety; or damagedinsulation; or loose connections; or aged flexible components and outer cover parts.5Structure
5.1 General principles
The electrical components of motor are specially approved models and specifications. They should be testedalong with the motor.All rotating parts should operate safely (including at over-speed).Components that are notconnected to rotating parts and would not affect electrical or mechanical safety may be taken as a separate partofthemotor,andcanbesuppliedseparately.5.1.2With the exception of waterproof motors (e.g.motors forunderwater use)and thosefree of water accumulationinside, all motors should have appropriate dewatering measures to prevent accumulated water inside, whichwould reduce the clearance and creepage distance between windings/naked charged parts and ground. The airvents on the motor can also perform dewatering functions. When arranging water-discharge holes, theirdiametersshouldbenosmallerthan3mmandconformtotherequirementsof7.6.5.1.3
If motor is an integral part of other equipment, the functions of motor bedplate and outer cover (inclusive ofjunctionbox)canbeperformedbytheequipment.5.1.4
GB 14711-2006
Asto natural air-cooling motor, if built-in overheat protector is required, it should conform to GB/T13002Withtheexception of open-typemotors,itmustbeensured that contactwiththepanel or coveringof nakedcharged parts (AC>30V,DC>50V) is avoided.The panel or covering may only be opened with tool or keys.5.2 Outer cover
Thematerialsof anycomponentontheoutercovershouldbeabletoendurehightemperaturesand mechanicalstressthatmayoccurduring normalworkingconditions.and should not incurfire orelectricshockdue tobending,creep,ordeformation
Outer cover protection grading should conform to GB/T 4942.1-2001.5.3Non-metallicstructures
Insulation structures for supporting and fixing current-carrying components should have good resistance toinflammation,heat,electric tracking,moisture,and adequatedielectric strength andmechanical strengthNon-metallic outer cover, windshield,and junction box should be able to endure humidity,grease,inflammation,and temperaturevariation.Theyshouldbeabletowithstand theimpact testas in7.8.3,theageing test as in7.1l,theheatdeformationtestasin7.12,andtheburningtestasin7.13The patch board and non-metallic junction box should be able to endure the temperatures no lower than thatspecified in Table 1.
5.4Junctionbox(formotors≤750V)andwiringdevices5.4.1
Junctionboxcanbeanindependentcomponentfixedontheexteriorofmotor,orserve,partiallyorwholly,asapartonthemotorhousing.
Junction box should have appropriatevolume in orderto contain wiring devices,meeting the clearance andcreepage distance requirements of 5.8, and be able to withstand the impulse voltage test as in 7.5.2.If madefrom metal, the junctionbox should have thethickness as specified in Table2,and conform to the testrequirementsof7.8.4.
Non-metallic junctionbox should conform to5.3.2.The fixing between junction box and motor housing should be separate from the fixing between junction boxand its cover.
Theprotectiongradeof junctionboxonsmallmotorshouldbenolessthanIP44.If wireconduitisused, it should be:a)No smaller than the sizes specified in Table 3, in consistence with the rated current marked on the motor;Placed in a flat, large enough area, to meet the requirements of bushing and locknut, unless the opening on theb)
junction box is suitable for wire to pass through and bushing need not be used to protect wire insulation.5.5 Conduit bushing and equivalent tapped hole5.5.1
Straight pipe or Taper pipe thread seal can be used for the tapped hole of conduit, with the screwing length nosmaller than 3.5pitches.The numberof inlet tapped-hole should be specified in product standard descriptionThe inlet holes should be equipped with insulation conduit and be sealed with rubber or similar material at thefactory.
Conduit bushing for a separately-cast junction box and tapped hole for fixing rigid metal conduit should haveenough mechanical strength and be tested as per7.8.5.5.6 Supply cord
If the motor is equipped with supply cord, or for the purpose of easy connection to other equipment, flexiblecables thatextend outside the bedplate (housing)are supplied along with necessary plugs,the cord and plugsshould conformto product standard orrelevant standard of the equipment.Unless grounding is not required, there should be one earth lead among the cords. The earth lead (including theterminal)shouldbearadifferentcolororsvmbolforeasydistinction.The supply cord should have a rated voltage no smaller than the motor's maximum working voltage. Itscurrent-carryingcapacity should atleastbeequaltoloadcurrentmultipliedbyusagecoefficientorfullloadrated current multiplied by 125%, whichever is the greater.The insulation of cord should be able to withstandthepower-frequencyvoltagetestrelatedtothis circuitUnless there are measures to eliminate the possible tensile force or the supply cord is not exposed, insulationlayer and clamps should be available where the cord extends out, in order toprevent external force passing ontothewires inside and avoid twisting or displacement of cords.Unless there are other protective measures, it must be ensured that cords do not withdraw into the motor.Clamps:cord clamps should bemade of insulatingmaterial.Ifmetal is present,there should be insulating lining.5.6.7
GB14711-2006
Cord clamps should be examined for reliability and be able to withstand the tension and torsion tests as in 7.9.Cord should not beforced through the inlet opening so as to damage the insulation.The loose cables/cords in the junction box that are to be connected on site should be no shorter than 15Omm infreelength.
5.7 Lead wire
Leadwiretypesandsizes
Lead wire should have appropriate current-carrying capacity and length.Lead wires on coils or of similarpurpose should conformto thefollowingrequirements:a)The lead wire for connecting to power supply should be no smaller than 0.75mmin cross-sectional area;b)Theleadwires insidethemotor,such asthosewhichconnecttointernal components orpowersupplycords or patch board, can be smaller than 0.75mm but should be no smaller than 0.30mm2.Lead wire insulation
5.7.2.1 As for windings lead or brush holder lead, which is soft and cannot be positioned to ensure proper clearanceinsulated conductor should be used or thermal- and moisture-resistant material should be used to wrap upcontinuously between two support points. The material can be insulating pad, insulating hose or otherappropriatemeans.
5.7.2.2Themodels and specifications oflead should fit theworking voltageof motor.If instantaneous high tension mayoccur on any component during normal operation,the lead should have good insulating capability towards thehightension.
5.7.2.3 Lead should conform to relevant standard, with thermal withstanding grade no less than the insulation grade ofthemotor.
Leadprotection
5.7.3.1Internal lead(wire)shouldbeproperlyfixedwithwindings.Twoormoreleads(wires)ofthesamealignmentshould be bound together. It should not be placed on the pointed or sharp edge of parts and stay away frommovableparts.
5.7.3.2The connections of internal leads (wire) should be insulated with bushings and tapes and properly fixed, toprevent accident due to loose bushing or loose weld. The connections should be able to withstand the dielectrictest as specified in 7.5. Lead (wire) and wireterminal should be joined with cold weld.5.7.3.3Propermeasures shouldbe available to ensurewireterminals stayintheiroriginal positionwhenconnectorbolts/nuts come loose.Open connector and lock washer should not be the only means.5.7.3.4 When stranded-lead (wire)is connected to terminal, it should stay in certain position,to avoid grounding orshort circuit
5.7.3.5When internal lead (wire)goes through motorbedplate,insulators or othermeans should be used to ensureinsulation at the bores. Insulators should be smooth, without burrs or sharp edge. Lead that passes through theexternal cooling chamber of hermetic motor should be protected with metallic cable conduit or similar pipes.5.8 Clearanceand creepagedistance of lowvoltagemotors (forrequirements on high voltage motors, see Chapter9 of this standard)
The clearance and creepage distance as described below should be no smaller than that specified in Table 4.Otherwise,theyshouldconformto5.8.2~5.8.5.Along the insulationmaterial surfaceand through theair;a)
Between naked charged parts of different voltages or between different polarity:Between naked charged parts (including electromagnetic wire) and parts that are grounded (or may begrounded)
With the exception of low voltage motors, clearance and creepage distance should conform to relevant articles inthis standard
As far as the stationary parts (e.g.brush holder)of brushed motors are concerned, due to carbon sootaccumulated (eg. on the insulation of the bush holder) between commutator and slip ring, the clearance andcreepage distance should be greater than that specified in Table 4 by 50% at least. Otherwise, appropriatespacers,rings or similardevices shouldbeprovided.The requirement of 5.8.3 on increased clearance and creepage distance is not applicable to motors with framesize greater than H90.
Asto therotor windings and centrifugal switches ofwound-rotormotors,theclearanceand creepage distancemay be smaller than that specified in Table 4, but it must be ensured that no bad consequence would occur.It must be ensured that wire connectors, including pressure-type connection (quick connection),do not twist ormove, in order to keep clearance and creepage distance no smaller than that specified in 5.8.1. Unless clearanceand creepage distance remain unchanged when connectors deviate in a range of 3o°, or the connector screws areinsulated, it is not necessaryto take additional measures to prevent connector turning.GB 14711-2006
The clearance and creepage distance as specified in Table 4 can be achieved by using insulating barrier, whichshouldbemadefromthefollowingmaterials.a) If naked live parts are within insulating barrier or may contact with the barrier, heat-/ moisture-resistantmaterial shouldbe applied (e.g.,ceramicbottle,phenolic plastic,polyester,polyestercarbonate,nylon,mica)b)Where it shall not contact naked live parts (except electromagnetic wire),appropriate moisture-resistant fiberand similar moisture-absorbingpartition may beused, with thicknessno smallerthan 0.66mm.If the clearanceand creepage distance exceed that specified by half,insulatingpartition no thinner than 0.33mm should be used.Other insulating materials thinner than 0.33mm,if proven suitablefor normal use in terms of mechanical andelectrical properties, can also be used.5.9Components
Components, such as capacitor, switch, current transformer, voltage transformer, should be fixed firmly and easytoreplace.
Capacitor should be installed inside protective cover and not contact metallic parts.If capacitor casing ismetallic,additional insulation should beused topartition itfrommetallic parts.Capacitor or its additional casingshould be ableto prevent splashings,sparks and meltingthatmay occur when capacitor breaks down.Steel cover for capacitorshouldbeno smaller than0.5mm in thickness.5.9.3
As to oil-filled capacitor (non-electrolytic capacitor), a pressure-sensitive breaker is built inside, to preventspillage of inflammable substance through the damaged casing.There should be extra axial space to allow themovement of breaker terminal. The extended space should be 12.7mm at least, which is a requirement inaddition to the clearance requirement specified in Table 4.5.10Protective grounding devicesGrounding devices that conformto10.1of GB755-2000 shouldbe available,unlessgrounding is not needed on5.10.1
the site.
5.10.2There should be permanent, reliable electrical connection between motor bedplate and grounding devices.Whenmotormovesontheequipmentbase,groundingconnectionshouldbestill ingood condition.5.10.3If wire terminal is used to connect ground wire, the terminal should conform to the relevant requirement in 5.12.5.10.4Ground wireterminal should belocked safely,toprevent accidental turning and reduced clearance/creepagedistance.Itcannotbereleased withouttheaidoftools.5.10.5Groundwireterminal shouldbeusedfornootherpurpose.5.10.6The materials of grounding conductor, grounding terminal and joint device should be compatible, with goodelectric-erosion resistance and conductibility. If ferrous metal is used, they should be protected withelectroplatingorothermeanstoavoidrusting.5.10.7
Grounding conductor should have enough tenacity, and be able to withstand the stress from motor vibration.Appropriatemeasures should be availableto avoid hazards during installation andoperation.5.10.8 It must be ensured that grounding connections are covered with non-conductive coatings such as paint.Connection should be by means of cold weld or other effective methods, instead of articulation or simplysoldering.
5.10.9Thegrounding conductor that penetratesrubberbase should be metallic,instead of conductive rubber.5.10.10 Grounding terminal screws and grounding conductor should have adequate cross-sectional area.For theminimum diameter of grounding screw, see Table 5.The cross section of grounding conductor should conformtoTable17inGB755-2000.
5.11Brushholder and terminals5.11.1 There should be good electrical contact between brush holder wire and terminals. Clearance and creepagedistance between movable parts/non-current carrying metallic parts and charged parts should not be reducedduring use.
5.11.2With the exception of electromagnetic wire,naked chargedparts should be supported byinsulating materialsthatareabletoendureinflammation,heat,moisture,andelectrictracking.*Pure mica no thinner than 0.25mm can also be used.5.11.3Theterminal wireat thebrushholdershouldhavestopperdevice.5.12 Wire terminal
GB14711-2006
5.12.1 As to bolt-type terminal connecting to power supply cable, the screw (bolt) and nut should conform to relevantstandard and requirements in5.12.3~5.12.4.5.12.2Theterminal of boltconnector should notbeusedtofixotherparts.When connectingto power supply cord,thewire terminal can be used to clamp wires inside the motor, if such act would not cause wires to become loose.5.12.3The permissible continuous current at the wire terminal is in relation to the structure of terminal, diameter andmaterial of screws (or bolts), which should conform to Table 6 (bolt connector), Table 7 (chip terminal), andTable8(looselead-outwire)respectively.5.12.4Wire terminals should be properly fixed. When clamps on the supply cable fasten or release, wire terminalsshould not turn or displace, lead-out wire should be subject to stress and clearance/creepage distance should beno smallerthanthelimits specified inTable4orTable13.5.12.5Wire connector should beequipped with OT-type pressure welding terminal or arched washer, to ensure reliableconnection between wire and terminal. When clamping wires, locking device should be available, to ensureappropriate contact between metal surfaces, so that wires would notbe damaged or slip.Terminal of bolt-type power connection should be equipped with hard plate connector, for the purpose of5.12.6
changing motor voltage, rotation speed and sense of rotation. It should be ensured that the clearance in allconnectionsisnosmallerthanthatspecifiedinTable4orTable13.5.12.7 If connector screw is installed on a metal piece, the metal should be no thinner than 1.3mm and should havemorethantwothreads.
As to metal that is un-stretched, if it is smaller than 1.3mm in thickness but no smaller than the thread pitch, thetapped holecanbe extruded tomakethe screwinglengthno smallerthantwopitches.5.12.8Wireterminals should be joined properlyto ensuregood conductivityand enoughcontactpressure,andexpected current-carrying capacity. All current-carrying components should be made from metals with goodconductivity and adequate mechanical strength. If fittings are made of ferrous metal, they should beelectroplated or protected with other effective means to avoid rusting.5.13 Bearing structure
It must beensured that lubricant do not flowdown the shaft and enter motor windings, current-carryingcomponents or other equipments.5.14CommutatorandcollectorringMotors with commutator and collector rings should have sight window that can be easily removed.Brush holdercomponents should be so designed that when they wear out, the brush, spring and other parts would not energize theuncharged metal partsnearby or contactcharged parts.5.15Insulation
5.15.1 Motor windings should be properly bound, fixed and insulated. Terminals of windings, if insulated, should notshownaked copper.
Theinsulation of themotor should havegood moisture-endurance,insulatingcapabilityandmechanical property5.15.2
Itshouldbeabletowithstand thetestas in7.10.The composition of insulation, such as electromagnetic wire, slot insulation, binding tape, slot wedge,5.15.3
impregnatingvarnish, supply cable, shouldbewell compatibleand pass test and prove appropriate.Insulationappraisal test should conform to 7.10.5.16Joints
5.16.1The joints for electrical or mechanical connection in the motor should be able to endure the mechanical stressthat occurs during normal operation.Screws (bolts)and nuts on the joints should not made from soft metals (such as zinc,aluminum and etc.)or metalsthatareliableto creep.
5.16.2Joint screws should have certain lengths to ensure reliable connection.5.16.3 If screws serve for the purpose of both mechanical and electrical connection, they should be locked safely toavoid accidentduetoloosening,heating and increased contactvoltage.5.16.4Rivets for electrical connection, if subject to torsion during normal use, should be locked to avoid turningGood locking devices include spring washer (or similar things), non-circular shank rivet, and other appropriatemethods
5.16.5Joints should be checked against the above requirements by visual inspection and hand.Symbols
6.1EachmotorshouldhavenameplateaccordingtoChapter9ofGB755-20006.2 As to single-direction motors, there should be an arrow to mark the sense of rotation.6.3If themotoris equippedwith powerneutral line,itshould bemarked withN\GB 14711-2006
6.4 The grounding symbol should be shown nearthe earthing terminal.Ifnecessary, theacronym\PE\should beshown meanwhile.These symbols should not be placed on screws, removable washers or wire connectingcomponentsthatmightbetakendown.6.5 As to small motors, the grounding cord should be colored with green and yellow. Other cords should not be coloredassuch.
6.6Symbols for wire terminals,senseofrotation,and their relations should conform toGB1971.6.7 If capacitor is not supplied with the motor, specifications of capacitor should be provided (e.g., model, capacitance,rated voltage).
6.8 As to series motor and compound motor that has speed regulation rate greater than 35%, manufacturer shouldspecify the maximum safe speed on the nameplate. As to DC motors that can withstand 110% of no-load speed, thenameplateneednotshowthemaximumsafespeed.6.9If lifting device is supplied and canonlybeused tolift components,signs shouldbegiven in a clearwayasfollows,unlessthedeviceisabletohoisttheentiremotor.Warning:\This device is not for lifting the entire motor. It is only able to lift the components attached to it\.Similarwarnings apply.
6.10 The following information and descriptions should be provided.Where themotor serves as a component of the finalassembly or wiring information has been contained in the connection drawing/description of the entire equipment, orforboth situations, the drawings and installation instructions as in a) and b)need not be provided with each motor.Wiring diagram,in whichthe symbol ofterminals should be consistent with theactual ones.The wiring drawinga)
plate should be fixed reliably.b) Installation instructions should be conform to the requirements on dewatering, mounting, and lubrication ofbearings. The installation instructions should also cover the devices supplied, such as heater, windings thermalprotector.
6.11 Manufacturing date should be shown where it can be easily seen without the aid of any tool. It can be shown in datecode,serial number orsimilarways6.12 All symbols on the motor can be printed, carved, pressed or in other effective methods.The material of symbols andproduction methods should ensure that the signs are clear, durable and would not wear away or come off during theservicelifeofthemotor
6.13 Signs and symbols should be checked with visual inspection and be tested according to 7.2.Tests
7.1 General principles
Motors should be tested as following methods to determine if they meet the requirements in this standard.Motorsequipped with heaters should satisfy the requirements of this standard and that specified by the manufacturer for alloperatingconditions.
7.2Testsofsymbolsand signs
First, wipe the signs with water-soaked cloth back and forward once a second for 15 seconds, and then withgasoline-soaked clothfor15seconds.After above test and all the tests required by this standard, the signs should remain clear and readable, not easyto remove. There should be no curled edge or other factors that can cause the signs to fall off.7.3Thermal tests
When tested as below, the temperature rises and temperatures of any part of the motor should conform to 7.3.4,7.3.7 and Table 1.
a)As to motors without specification of rated output, the rated input current can be obtained by applying loadon the motor, or increasing input voltage.b)As to motor with specification of time cycles, test should be conducted at rated frequency or rated rotationspeed, along with rated output power. As to motors with continuous rating,test should be continued untilthermal stability is achieved.7.3.2Testvoltages
7.3.2.1Thermal test should be conducted under the rated voltage specified in the nameplate.As tolarge capacitymotors,if it isdifficultto performtestunder rated voltage,test can beconducted accordingtorelevantstandard.GB 14711-2006
7.3.2.2AstoDCmotors (frame size≤H80)powered throughrectifier,thepower supplyapplied inthetest shouldbeabletoproviderated voltageand specifywaveformcoefficient,underrated load7.3.3
As to motors with specified usage coefficient, load should be continuously applied under rated voltage andfrequencyuntil the actual output equals to rated power multiplied by usage coefficient.Tests should be conducted under the operation conditions as specified in GB755-2000 and the product standardThe temperature rise limits, measuring methods and modified values for windings, core iron, commutator andcollector ring should conform to GB755-2000.Measurement of bearing temperatures should conform toGB755-2000.The temperature limits of bearings are specified in product standard.Special-purpose motors should be tested according to operation conditions, including ventilation, modes ofinstallation,ambienttemperaturesandtemperaturerises.If themotorhas several ratings,test should be conducted at the rating that could result in thehighesttemperature.
Junctionbox
7.3.7.1 Temperatures inside the junction box and of the supply cords should not exceed that specified in Table 1.7.3.7.2Thermal test should conform tofollowingrequirements:a)
The permissible current-carrying capacity of the wire connecting to external power is 125% of the rated currentatfullload:
The supply cable outside the junction box should be no less than 1.22m;Supply cables shouldgothroughconduit;c
d)All unused openings on the junctionbox shouldbe covered.7.4 Insulation resistance
Windings insulation resistance afterthe heat status ortemperaturerise test should be no smaller that the outcomeoftheequationbelow:
1000+P/100
Where:
R-windings insulation resistance,unitM;Uwindings rated voltage, unit V;Pmotorrated power,unitkw,kVAorkvar.If the insulation resistance obtained from the above equation is smaller than 0.38M, the test should apply 0.38MQ
After the humidity and thermal test as in 7.7, the hot-state insulation resistance should be no smaller than thatspecified in 7.4.1.
Astolowvoltagemotors,thecold-stateresistanceshouldbenosmallerthan5MQInsulationresistancemeasurementmethods7.4.4.1Themeasurement instrumentshould optforvoltagesaccordingtoTable9.7.4.4.2 As to windings that are connected to the housing directly or through protective capacitor during operation.measurement should be conducted after windings are disconnected from the housing or protective capacitor7.4.4.3 As to winding rotor motors, the insulation resistance of stator and of rotor should be measured respectively.7.4.4.4 As to motors with several sets of windings, the insulation of each winding should be measured respectively(exceptwindingswithoutearth insulation)7.4.4.5Aftermeasurement, windings shouldbe discharged to earth.7.5 Voltage withstanding testMotor insulation should have adequate voltage-withstand capability.It should be able to withstand the voltage testsas in 7.5.1 and 7.5.2, without puncture or flashover. It must be ensured that protective measures are available duringthe test and nobody contacts the circuit and the motor being tested.Power frequencyvoltagetest
7.5.1.1 The test should conform to 8.1 of GB755-2000. The test voltages for every type of motor should conform toTable 14 in GB755-2000.Before the test, the insulation resistance of windings should be measured as perrequirements.
7.5.1.2Test should be conducted on the assembled motor.The status of motor and wiring during test should conform to8.1of GB755-2000.If it is not easy to distinguish the neutral point among the three phase windings,test voltageshould be applied simultaneously on all winding ends.8
GB14711-2006
7.5.1.3As to motors that are not designed for electric-shock proof or whose solid-state device is liable to damage duringvoltage test,voltage-withstand test should be conducted before the motor is connected to other equipment.7.5.1.4During test,the surge capacitor,lightening arrestor and currenttransformer should be disconnected from wireterminalsandlinkedtorackearth.7.5.1.5As tocapacitormotors,the capacitorshould stayconnected towindings as in thenormalwork stateofthemotor(operation or starting)
7.5.1.6As to brushless excitation motor and synchronous motor, when voltage test is conducted on the field windingsthe electronic components in the circuit (such as diode, crystal brake tube) should be shorted itself first, withoutbeing grounded.
7.5.1.7 During test, the space heater and thermometer in the motor should be connected to rack earth.7.5.1.8 As to motors with rated voltage ≤1,000kV, for every 1kV test voltage, the capacity of test transformer shouldbeno smaller than IkVA
7.5.1.9As tomotors with rated voltage>l,oo0kV,for every5kVtestvoltage,thecapacityof testtransformer should benosmallerthan1kVA.
7.5.1.1oTestvoltagesshouldbemeasuredbyelectrostaticvoltmeterorvoltagetransformerorspecializedwindings,onthe high-tension side of test transformer. Conversion using the measurement on the low-tension side of testtransformerisnot recommended.7.5.1.11Test current should be measured and determinedonthe high-tension sideoftesttransformer.a)As to motors with AC rated voltage≤1,000kV,DC rated voltage≤1,500kV, the over-current relay of thehigh-tension transformer used in the test should have release current of 100mA. When test current≥100mA,themotorcanbe judgedtobepunctured.b)As to motors with AC rated voltage>1,000kV,DC rated voltage>1,500kV, the test results should be assessedaccordingtorelevantproductstandard.7.5.2
Impulsevoltagetest
7.5.2.1 Windings, patch board and other insulated parts in relation to housing (earth) should undergo impulse voltagetest.
7.5.2.2 Cage induction motors in the scope of JB/T 8158 should conform to GB755-2000.7.5.2.3High-tensionACmotorsshouldconformtoJB/T10098-2000.7.6Protection test
Housingprotectionacceptanceconditionsshould conformtoGB/T4942.17.7Moisture/thermal test
Motors should beable to endurethemoisture thatmay occur during normal use.7.7.1此内容来自标准下载网
Unless otherwise stated, temperature-humidity test should be conducted at 4oC for six cycles according toGB/T 2423.4-1993.After the test,the hot-state insulation resistance should be no smaller than that specified in7.4. The motor should pass the power-frequency voltage-withstand test, with the test voltage being 80% of thatspecified in 7.5.1.1.
7.8Mechanical strengthtest
7.8.1Over-speed
Over-speed test should be conduced on the rotating parts as per GB755-2000 stipulated in 8.5. After the test, thereshould be no permanent abnormal deformation or other faults.Rotor windings should meet the requirements ofvoltage-withstand test.
Short-timeovertorque
Motor should beabletowithstandthe short-timeover torquetestasper8.3ofGB755-2000,withouthavingabruptchange or halt in rotating speed or harmful deformation.7.8.3
Impacttest
7.8.3.1 As to non-metallic housing, any point on the surface should be able to sustain the shock produced by a o51mm,0.53kg steel ball that falls from a height of 1,300mm, which is equivalent of 6.78J.7.8.3.2Thetestasin7.8.3.1shouldbeconductedatroomtemperature.7.8.3.3Afterthetest as in7.8.3.1,there should nodamage that would affect its furtheruse, and clearance/creepagedistanceshouldnotbereduced.
Junction box static pressure test7.8.4.1 Junction box should be durable and fixed firmly, without harmful deformation or loosening. Test should beconducted accordingto themethodsbelow.7.8.4.2As to the junction box ofmotors with frame sizegreater thanH9o, its surface should be ableto sustain verticalstaticpressureof1,O6oNforoneminute.Thisvertical staticpressureisnotrelevanttotheplacewhere themotor is to be mounted. As to motors with frame size≤H9o, the horizontal surface of the junction box should beabletosustainavertical staticpressureof0.135N/mm(135kPa),themaximumbeing1,060N9
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