1、Designation: F1207M 12 An American National StandardStandard Specification forElectrical Insulation Monitors for Monitoring GroundResistance in Active Electrical Systems Metric1This standard is issued under the fixed designation F1207M; the number immediately following the designation indicates the
2、year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers electrical insulation moni
3、tor-ing devices intended as permanently installed units for use inthe detection of ohmic insulation faults to ground in active ACungrounded electrical systems.1.2 LimitationsThis specification does not cover deviceswhich are not intended for operation for: DC ungroundedsystems or AC ungrounded syste
4、ms with DC componentsunless AC to DC conversion is isolated from the monitoredsystem with transformers.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.4 The following precautionary caveat pertains only to thetest methods
5、portion, Section 9, of this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limit
6、a-tions prior to use.2. Referenced Documents2.1 UL Standard:UL 1053 Ground-Fault Sensing and Relaying Equipment23. Terminology3.1 Definitions:3.1.1 AC internal resistancea monitors impedance be-tween the measuring terminals and ground terminals.3.1.2 AC ungrounded electrical systema monitored sys-te
7、m that has no intentional connection from phase or neutral toground and can continue to perform normally if one conductorbecomes connected to ground.3.1.3 DC internal resistancea monitors ohmic resistancebetween the measuring and ground terminals.3.1.4 input voltagethe supply voltage at the terminal
8、s ofan insulation monitor.3.1.5 measuring voltagethe output DC voltage from theinsulation monitor that is superimposed between the ACungrounded system and ground.3.1.6 nominal contact voltagethe voltage rating for amonitors internal relay contacts.3.1.7 nominal frequencythe frequency of a monitoreds
9、ystem.3.1.8 nominal voltagethe voltage (phase-to-phase) of amonitored system.3.1.9 response valuethe adjustable or preset set pointvalue of system insulation resistance for which an insulationmonitor will provide alarm indication.3.1.10 system insulation resistancethe total insulation re-sistance to
10、 ground to be monitored, which is measured by DCvoltage.4. Monitor Classification4.1 Type 1Insulation monitor for 115-V, 3-phase or single-phase, 60-Hz, AC ungrounded electrical systems.4.2 Type 2Insulation monitor for 115-V, 3-phase or single-phase, 400-Hz, AC ungrounded systems.4.3 Type 3Insulatio
11、n monitor for 440-V, 3-phase or single-phase, 60-Hz, AC ungrounded systems.4.4 Type 4Insulation monitor for 440-V, 3-phase or single-phase, 400-Hz, AC ungrounded systems.4.5 Type 5Insulation monitor for up to 1000-V, 3-phase orsingle-phase, 50 to 400-Hz, AC ungrounded systems.5. Ordering Information
12、5.1 Monitoring devices shall be ordered by specifying thefollowing information:5.1.1 Nominal voltage and frequency.5.1.2 Response value/set point range in kilohm.5.1.3 Special options, that is, test buttons, ohmeters, visualindicators, and so forth.1This specification is under the jurisdiction of AS
13、TM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.10 onElectrical.Current edition approved Oct. 1, 2012. Published November 2012. Originallyapproved in 1989. Last previous edition approved in 2007 as F1207M - 96(2007).DOI: 10.1520/F1207M-12.2Availabl
14、e from Underwriters Laboratories (UL), 333 Pfingsten Rd.,Northbrook, IL 60062-2096, http:/.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16. Requirements6.1 The measuring voltage shall not increase more than10 % when the monitor is s
15、upplied with 110 % of the inputvoltage.6.2 The monitor shall be capable of both continuous andon-demand operation.6.3 The monitor shall have provisions for an external(remote) audible or visual alarm to operate when the resistancevalue falls below the response value, or a remote indication ofthe ins
16、ulation value of the AC ungrounded system in kilohms,or both.6.4 The AC internal resistance shall be at least 250-/Vnominal voltage. The minimum resistance shall not be less than15 k.6.5 The DC internal resistance shall be at least 30-/Vnominal voltage and shall limit the measuring DC outputcurrent
17、from exceeding 12 mA.6.6 The monitors response tolerance shall not exceed65 % of the set point value at room temperature (25 6 5C (726 9F) and rated input voltage.6.7 When specified, insulation monitors shall be furnishedwith adjustable response values and designed to precludetampering or unauthoriz
18、ed changes.6.8 The insulation monitor shall function reliably in anambient temperature range from 0 to 50C (32 to 122F).Storage temperatures of 20 to +60C (4 to 140F) must notdamage the insulation monitors.6.9 Insulation monitors shall include a built-in test device orbe equipped with connection pro
19、visions for a test device to befurnished with the equipment which can verify the monitorsproper functioning. If the monitor is equipped with a built-intest device, the value of the test resistor shall be marked on themonitor.6.10 Insulation monitors shall include an integral visualindicator or exter
20、nal connection provisions for external annun-ciation of the monitors set-point response.6.11 If the insulation monitor includes an ohmmeter for theinsulation resistance indication, the meters tolerance (actualrather than indicated values) shall not exceed 65 % for:6.11.1 An insulation monitor with o
21、ne preset response valueat this value.6.11.2 An insulation monitor with adjustable response valueat the midpoint of the adjustment range.6.11.3 Conditions of room temperature (as specified in 6.6)and rated input voltage.6.12 Built-in relays for connection to external alarms shallhave a switching cap
22、acity of at least 2 A at 250-VAC or 0.5 Aat 120-V DC.6.13 Between isolated, outgoing circuits and between thesecircuits and extraneous conductive parts, insulation monitorsshall have creepage and air gap separation in accordance withUL1053 for voltages up to 300 V. For higher nominal voltages,see IE
23、C Report 664.37. Product Marking7.1 The following data shall be identified on an insulationmonitors enclosure:7.1.1 Name of manufacturer.7.1.2 Type of monitor.7.1.3 Connection diagram.7.1.4 Nominal voltage rating.7.1.5 Input voltage.7.1.6 Nominal frequency.7.1.7 Response value or range.7.1.8 Test re
24、sistance value in accordance with 6.9.7.1.9 Serial number, or year of production.8. Equipment Manual8.1 The manufacturers equipment manual shall provide thefollowing information in addition to that required in 7.1:8.1.1 Description of operation.8.1.2 Values for AC and DC internal resistance.8.1.3 Co
25、nnection diagram. Clearly identify where the con-nections are to be made to the equipment being monitored.8.1.4 Nominal value of DC measuring voltage, based onpossible supply voltages.8.1.5 Maximum DC measurement current at short-circuitconditions.8.1.6 Nominal contact voltage and current ratings fo
26、r inte-gral relays in accordance with 6.12.8.1.7 Anote advising that external DC voltage applied to themonitors measuring terminals may falsify the indication ordestroy the insulation monitor.8.1.8 Magnitude of external DC voltages, independent oftheir polarity, which may continuously be applied to
27、theinsulation monitor without damaging it.9. Test Methods9.1 Type TestPerform type testing of insulation monitorsto confirm that the response tolerances stipulated are notexceeded and that the requirements of Section 6 are met. Anewly developed monitor shall be in complete compliance withthe followi
28、ng:9.1.1 The measuring devices used for testing shall enable aslow stepless or step-by-step alteration of the simulated insu-lation resistance. On testing, the resistance shall be decreasedslowly and the insulation monitors response shall be observed.9.1.2 Voltage measurements shall be taken to conf
29、irm thatthe requirements of 6.1 and 8.1.4 are met. The voltmetersinternal resistance shall have a minimum value not less than100 times the DC internal resistance of the measuring circuit.3Insulation Coordination within Low-Voltage Systems Including Clearances andCreeping Distances for Equipment, IEC
30、 Report 664 , International ElectrotechnicalCommission, 1980.F1207M 1229.1.3 The AC internal resistance specified in 6.4 shall beverified with an rms milliampmeter and a power supply havingan output rated at nominal voltage and nominal frequency, aninternal resistance of under 10 , and a harmonic di
31、stortion ofless than 5 %. The rms milliampmeter shall be connectedbetween the monitors measuring terminal(s) and output ter-minal of the power supply. The other output terminal of thepower supply shall be connected to the monitors groundterminal. The monitors internal impedance, , shall be calcu-lat
32、ed as follows: 5nominal voltageAC rms current9.1.4 When insulation monitors have steplessly adjustableresponse values, test at least five points within the markedadjustment range in order to verify the requirements of 6.6. Forthis purpose, test the ranges starting and final points anduniformly distr
33、ibuted points within the range.9.2 Production TestThe production test proves the correctquality and functioning of new monitors. Each insulationmonitor shall be subjected to these tests.9.2.1 Visually examine each monitor to verify appropriatemarkings as specified in Section 7.9.2.2 Perform routine
34、tests at room temperature (25 6 5C(72 6 9F) with rated input voltage and by a measuring devicecomplying with the requirements of 9.1.1.9.2.3 When the insulation monitors have a steplessly adjust-able response value, test the response at the ranges startingand final points.9.2.4 Perform a voltage wit
35、hstand test on the monitor toverify that the monitor is able to withstand an AC test voltageequal to twice the nominal voltage plus 1000 V for a period of1 s without any breakdown or flashover. Perform the tests asfollows:9.2.4.1 Bridge all primary terminals.9.2.4.2 Bridge all electronic terminals.9
36、.2.4.3 Bridge all relay contacts.9.2.4.4 Apply the test potential as follows: ( a) betweenbridged primary terminals and bridged electronic terminals; (b)between bridged primary terminals and bridged relay contacts;and (c) between bridged electronic terminals and bridged relaycontacts.9.2.4.5 Connect
37、 all bridged circuits together.9.2.4.6 Apply test potential between the connected, bridgedcircuits and all dead metal parts that may become live (forexample, enclosures).9.2.5 Verify that the built-in test device is properly func-tioning.9.2.6 If indicating instruments are built into the insulationm
38、onitor, verify that these instruments do not exceed theresponse tolerances specified in 6.11.10. Keywords10.1 active AC electrical system; electrical; electrical insu-lation; electrical insulation monitor; ohmic insulation faults;shipboard; ungrounded electrical systemsASTM International takes no po
39、sition respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibi
40、lity.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to A
41、STM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the addres
42、s shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).F1207M 123
