1、Designation: F1669M 12 An American National StandardStandard Specification forInsulation Monitors for Shipboard Electrical SystemsMetric1This standard is issued under the fixed designation F1669M; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、 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 two (2) types of electricalsystem insulation monitoring devices.1.
3、1.1 Type I is an AC device intended as a permanentlyinstalled unit for use in the detection of ohmic insulation faultsto ground in active AC ungrounded electrical systems up to1000 VAC, having DC components up to 1500 VDC.1.1.2 Type II is a DC device intended as a permanentlyinstalled unit for use i
4、n the detection of ohmic insulation faultsto ground in DC ungrounded electrical systems up to 1500VDC.1.2 LimitationsThis specification does not cover devicesthat are intended for operation in AC ungrounded systemswithout DC components.1.3 The values stated in SI units are to be regarded as thestand
5、ard. The values given in parentheses are for informationonly.1.4 The following precautionary caveat pertains only to thetest methods portion, Section 7 of this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility
6、 of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 UL Standard:UL STD 840 Insulation Coordination Including Clearancesand Creepage Distances for Electrical Equipment22.2 I
7、EC Standards:3IEC 255-5 Insulation Tests for Electrical RelaysIEC 364-4-41 Electrical Installations of Buildings/Protection for Safety/Protection Against Electrical Shock2.3 Military Standard:MIL-STD-1399 (NAVY) Section 300A Interface Standardsfor Shipboard Systems; Electrical Power, AlternatingCurr
8、ent43. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 AC or DC ungrounded electrical system, na systemthat has no intentional connection to ground and can continueto perform normally if one conductor becomes connected toground.3.1.2 measuring signal, nthe output signal from the
9、insu-lation monitor that is superimposed between the AC or DCungrounded system to be monitored and ground.3.1.3 response value, nthe adjustable or preset set-pointvalue of the system insulation resistance at which an insulationmonitor will provide an alarm indication.3.1.4 system leakage capacitance
10、, nthe total capacitanceto ground of the system including all connected consumers.3.1.5 touch voltage, nthe voltage appearing during aninsulation fault, between simultaneously accessible parts. Thisterm is used only in connection with protection against indirecthuman contacts, that is, no direct hum
11、an contact with a liveconductor. The International Electrotechnical Commission(IEC) limits the maximum prospective touch voltage which canbe maintained indefinitely to 50 VAC rms or 120 V ripple-freeDC.4. Ordering Information4.1 Orders for monitoring devices under this specificationshall state the f
12、ollowing information:4.1.1 Type and quantity.4.1.2 Nominal system voltage and frequency (for AC sys-tem).4.1.3 Input supply voltage.4.1.4 Response value/set-point range expressed in K-Ohms.1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the di
13、rect responsibility of Subcommittee F25.10 inElectrical.Current edition approved Oct. 1, 2012. Published November 2012. Originallyapproved in 1996. Last previous edition approved in 2007 as F1669M - 96(2007).DOI: 10.1520/F1669M-12.2Available from Underwriters Laboratories (UL), 333 Pfingsten Rd.,Nor
14、thbrook, IL 60062-2096, http:/.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.4Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5098, Attn: NPODS.Copyright A
15、STM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.1.5 ASTM designation and year of issue.4.1.6 System leakage capacitance or data from which anestimate of its magnitude can be determined.4.1.7 Special requirements such as Test/Reset buttons,ohmm
16、eters, visual indicators, memory fault retention, and soforth.5. Materials and Manufacturing Methods5.1 The materials and manufacturing methods used shall besuch that the resulting products will conform to the propertiesand characteristics prescribed in this specification.6. Performance Requirements
17、6.1 Response of Insulation Monitor to a Step Input Theinsulation monitor measures the combined parallel resistanceto ground from all power or circuit conductors. The time torespond to a step change in the actual resistance to a value lessthan or equal to 50 % of the desired response value shall bego
18、verned by the expression:t s! #100140 RI3 Cs! (1)whereRI= internal resistance of monitor, ohm, andCs= total system capacitance, farad.For example,t 5 124 sifRI5 120000 ohm and Cs5 5 31026farad6.2 Measuring Signal Voltage Limits The peak value ofthe measuring signal shall under all operating conditio
19、ns belimited to a magnitude deemed acceptable by applicable safetystandards for the intended use.The peak value of the measuringsignal shall be less than the touch voltage limits: 120 VDCripple-free and 50 VAC rms.6.3 Internal Impedance and Internal ResistanceThe ACinternal impedance and DC internal
20、 resistance shall be at least30 ohms per volt nominal system voltage but in either caseshall not be less than 12 K-Ohms.6.4 Response ToleranceThe response tolerance of themonitor shall not exceed 0 to +50 % of the upper value of theset point range when measured at a room temperature of 25 65C (72 6
21、9F), with an input supply voltage 80115 % of itsnominal value and with a system leakage capacitance equal tothe value at which the monitor is calibrated (1 fd minimum).6.5 Working Range of System Voltage and Frequency Theinsulation monitor shall perform as specified when operatingwith a system volta
22、ge of 0115 % nominal over the frequencyrange 50400 hz.6.6 Self-TestThe insulation monitor shall include a built-intest device or be equipped with connection provisions for aseparate device that shall be furnished with the equipmentwhich can verify the proper functioning for the monitor.6.7 Output Re
23、layThe insulation monitor shall have provi-sions for an external (remote) audible or visual alarm to operatewhen the insulation resistance value falls below the set-pointvalue, or a remote indication of the insulation resistance valueof the ungrounded system, or both. Built-in relay contacts forconn
24、ection to an external alarm shall have a continuous ratingof at least 4 amperes at 250 VAC. The break capacity shall beat least 2 amps at 250 VAC (0.7 power factor) and 0.3 amps at120 VDC.6.8 Built-In Display of Insulation ResistanceIf provisionsare made to indicate (display) the current insulation
25、resistancelevel, then the manufacturer shall provide information as to theaccuracy of this indication during normal operating conditions.6.9 Clearance and Creepage Distances The insulationmonitor shall have protective spacings through air (clearance)and over surface (creepage) as stated in UL STD 84
26、0 for theintended maximum circuit voltage.6.10 Impulse Voltage Withstand Tests The insulationmonitor shall meet the IEC 255-5 Class III Impulse VoltageWithstand Test Requirements.7. Operating Environment7.1 The insulation monitor shall reliably function over anambient temperature range of 0 to 50C (
27、32 to 122F) and at arelative humidity of up to 95 %. Storage temperatures of 20 to+60C (4 to 140F) shall not damage the insulation monitor.8. Test Methods8.1 Conformance TestConformance testing of insulationmonitors shall be performed to confirm that the responsetolerances stipulated are not exceede
28、d and that the require-ments of Section 6 are met.8.1.1 Response Value TestsThe measuring devices usedfor testing shall enable a slow stepless or step-by-step changeof the simulated insulation resistance and shall allow theconnection of artificial system leakage capacitances. To simu-late the system
29、 leakage capacitance, capacitors with an isola-tion resistance of 100 times the desired response value and witha tolerance of +10 % maximum shall be used. On testing, theresistance shall be decreased slowly and the insulation moni-tors response shall be observed. For testing the response value,the t
30、est arrangement with its insulation resistance level and itsown capacitance must be considered.8.1.1.1 An insulation monitor with adjustable response shallbe tested at the beginning, mid and end points of its range.These tests shall be done without connected capacitances. Thetest resistor must be de
31、creased slowly to ensure that a staticresponse value is read. If the measuring principle is dependenton the system leakage capacitance, the tolerances must betested in accordance with 6.4. This test is done by increasingthe test capacitance step by step to the value at which themonitor was calibrate
32、d.8.1.2 Testing of Response TimeAt a system leakage of 1fd, there shall be a step change in the insulation level fromnearly infinity to 50 % of the derived response value. The timefor the output relay to react shall be measured.8.1.3 Testing of Peak VoltagePeak voltage measurementsare taken to confi
33、rm that the requirements for 6.2 are met. Thevoltmeters internal resistance should have a minimum valuenot less than 20 times the DC internal resistance of themeasuring circuit.8.1.4 Testing of Input Impedance or Resistance:8.1.4.1 Testing the AC Internal Impedance The AC inter-nal impedance specifi
34、ed in 6.3 is verified without any inputF1669M 122supply voltage, with an rms milliammeter and with an externalpower supply wired between the linked measuring terminalsand the ground terminal. The power supply must have an ACoutput rated at nominal voltage, nominal frequency, a harmonicdistortion of
35、less than 5 % and internal impedance of under 10ohms. The monitors internal impedance is calculated asfollows:Zr5Nominal System VoltageAC rms Current(2)8.1.4.2 Testing the DC Internal Resistance The externalpower supply must have a DC output rated at nominal systemvoltage. The monitors internal resi
36、stance is calculated asfollows:Rr5Nominal System VoltageDC Current(3)8.1.5 Testing of Built-in MetersIf indication instrumentsare built into the insulation monitor, they must be checked sothat they comply with the response tolerances laid down in 6.8.8.1.6 Testing the Impulse Voltage Withstand Capab
37、ilitiesThese tests will follow the procedure outlined in IEC 255-5Class III.8.2 Routine TestsEach monitor must undergo a test duringproduction to prove that the insulation monitor functionscorrectly.8.2.1 Testing of Response ValueRoutine tests should beperformed at room temperature 25 6 5C (72 6 9F)
38、 withrated input supply voltage. The insulation monitor must com-ply with the requirements of 6.4.8.2.1.1 The response of the insulation monitor is to be testedat the beginning and end points of the range if it has asteplessly adjustable response value.8.2.2 Testing of Self-Test Function The interna
39、l and exter-nal test buttons must be checked according to 6.6. The built-intest devices proper functioning must be verified.8.2.3 Testing of Built-in MetersIf the insulation monitorhas built-in indication meters, they must be checked so thatthey comply with the response tolerances according to 6.8.
40、Thetest should be performed at room temperature with rated inputsupply voltage.8.2.4 Voltage TestA voltage test is performed on themonitor to verify that the monitor is able to withstand an ACtest voltage equal to twice the nominal systems voltage plus1000 V for a period of one second without breakd
41、own orflashover. The test voltages shall be applied directly to theterminals. Unless obvious, the independent circuits are thosewhich are so described by the manufacturer.8.2.4.1 Link all terminals of each independent circuit. Notethat circuits having the same rated insulation voltage may beconnecte
42、d together when conducting the test in accordancewith 8.2.4.3( c).8.2.4.2 Link all terminals of open-contact2circuits.8.2.4.3 Apply test potential: (a) between linked independentcircuits; (b) between linked-independent circuits and linkedopen-contact circuits; ( c) between linked independent circuit
43、sand exposed conductive parts.8.2.5 Verification of Markings, Labels and ManualsVisual examination should verify appropriate markings asspecified in Section 9.9. Product Marking and Equipment Manual9.1 The following data shall be included on all enclosuresfor insulation monitors:9.1.1 Name of manufa
44、cturer.9.1.2 Type of monitor.9.1.3 Connection diagram.9.1.4 Input supply voltage.9.1.5 Nominal supply voltage and frequency (for AC sys-tems).9.1.6 Response value or response range.9.1.7 Test resistance value.9.1.8 Serial number or year of production.9.2 Manufacturers equipment manual shall provide
45、thefollowing information in addition to the above requirement.9.2.1 Description of operation.9.2.2 AC internal impedance or DC internal resistance.9.2.3 Connection diagram. Clearly identify where the con-nections are to be made to the equipment being monitored.9.2.4 Nominal value of measuring signal
46、.9.2.5 Maximum measurement current.9.2.6 Nominal contact voltage and current ratings for inte-gral relays per 6.7.9.2.7 A note advising that system leakage capacitance mayinfluence the measurement.9.2.8 A note advising that only one monitor may be con-nected per galvanic circuit and that one monitor
47、 must bedisconnected when two ungrounded systems containing inde-pendent monitors are coupled together.10. Keywords10.1 AC electrical systems; DC components; DC electricalsystems; electrical insulation monitoring; electrical systems;ohmic insulation faultsF1669M 123ASTM International takes no positi
48、on 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 responsibility
49、.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 ASTM 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 shoul
