1、Designation: F1669M 12 (Reapproved 2018) 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 adopti
2、on 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 two (2) types of electricalsystem insulation mon
3、itoring devices.1.1.1 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 permanentlyinstal
4、led unit for use in 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 re
5、garded asstandard. The values given in parentheses after SI units areincluded for information only and are not considered standard.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 saf
6、ety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety, health, andenvironmental practices and determine the applicability ofregulatory limitations prior to use.1.5 This international standard was developed in accor-dance wi
7、th internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 UL Standard:2
8、UL STD 840 Insulation Coordination Including Clearancesand Creepage Distances for Electrical Equipment2.2 IEC 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:4
9、MIL-STD-1399 (NAVY) Section 300A Interface Standardsfor Shipboard Systems; Electrical Power, AlternatingCurrent3. 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 perfor
10、m normally if one conductor becomes connected toground.3.1.2 measuring signal, nthe output signal from the 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
11、 resistance at which an insulationmonitor will provide an alarm indication.3.1.4 system leakage capacitance, 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.
12、 Thisterm is used only in connection with protection against indirect1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.10 inElectrical.Current edition approved April 1, 2018. Published May 2018. Orig
13、inallyapproved in 1996. Last previous edition approved in 2012 as F1669M 12. DOI:10.1520/F1669M-12R18.2Available from Underwriters Laboratories (UL), 333 Pfingsten Rd.,Northbrook, IL 60062-2096, http:/.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York,
14、NY 10036, http:/www.ansi.org.4Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,Philadelphia, PA 19111-5094, http:/quicksearch.dla.mil.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was d
15、eveloped in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1human contacts,
16、 that is, no direct human 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 specifi
17、cationshall state the following 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.4.1.5 ASTM designation and year of issue.4.1.6 System leakage capacitance or data from w
18、hich anestimate of its magnitude can be determined.4.1.7 Special requirements such as Test/Reset buttons,ohmmeters, 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 w
19、ill conform to the propertiesand characteristics prescribed in this specification.6. Performance Requirements6.1 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
20、change in the actual resistance to a value lessthan or equal to 50 % of the desired response value shall begoverned by the expression:t s! #100140 RI3 Cs! (1)where:RI= internal resistance of monitor, ohm, andCs= total system capacitance, farad.For example,t 5 124 sifRI5 120000 ohm and Cs5 5 31026far
21、ad6.2 Measuring Signal Voltage LimitsThe peak value of themeasuring signal shall under all operating conditions be limitedto a magnitude deemed acceptable by applicable safety stan-dards for the intended use. The peak value of the measuringsignal shall be less than the touch voltage limits: 120 VDCr
22、ipple-free and 50 VAC rms.6.3 Internal Impedance and Internal ResistanceThe ACinternal impedance and DC internal 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
23、 exceed 0 to +50 % of the upper value of theset point range when measured at a room temperature of 25 65C (72 6 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
24、 System Voltage and Frequency Theinsulation monitor shall perform as specified when operatingwith a system voltage 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
25、 that shall be furnished with the equipmentwhich can verify the proper functioning for the monitor.6.7 Output RelayThe 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
26、 indication of the insulation resistance valueof the ungrounded system, or both. Built-in relay contacts forconnection 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.
27、6.8 Built-In Display of Insulation ResistanceIf provisionsare made to indicate (display) the current insulation resistancelevel, then the manufacturer shall provide information as to theaccuracy of this indication during normal operating conditions.6.9 Clearance and Creepage DistancesThe insulationm
28、onitor shall have protective spacings through air (clearance)and over surface (creepage) as stated in UL STD 840 for theintended maximum circuit voltage.6.10 Impulse Voltage Withstand TestsThe insulationmonitor shall meet the IEC 255-5 Class III Impulse VoltageWithstand Test Requirements.7. Operatin
29、g Environment7.1 The insulation monitor shall reliably function over anambient temperature range of 0 to 50C (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 test
30、ing of insulationmonitors shall be performed to confirm that the responsetolerances stipulated are not exceeded 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 insulati
31、on resistance and shall allow theconnection of artificial system leakage capacitances. To simu-late the system 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
32、decreased slowly and the insulation moni-tors response shall be observed. For testing the response value,the test 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
33、 end points of its range.These tests shall be done without connected capacitances. Thetest resistor must be decreased slowly to ensure that a staticresponse value is read. If the measuring principle is dependenton the system leakage capacitance, the tolerances must beF1669M 12 (2018)2tested in accor
34、dance with 6.4. This test is done by increasingthe test capacitance step by step to the value at which themonitor was calibrated.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. T
35、he timefor the output relay to react shall be measured.8.1.3 Testing of Peak VoltagePeak voltage measurementsare taken to confirm 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 circ
36、uit.8.1.4 Testing of Input Impedance or Resistance:8.1.4.1 Testing the AC Internal ImpedanceThe AC inter-nal impedance specified in 6.3 is verified without any inputsupply voltage, with an rms milliammeter and with an externalpower supply wired between the linked measuring terminalsand the ground te
37、rminal. The power supply must have an ACoutput rated at nominal voltage, nominal frequency, a harmonicdistortion of 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
38、ResistanceThe externalpower supply must have a DC output rated at nominal systemvoltage. The monitors internal resistance 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
39、 sothat they comply with the response tolerances laid down in 6.8.8.1.6 Testing the Impulse Voltage Withstand CapabilitiesThese 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 funct
40、ionscorrectly.8.2.1 Testing of Response ValueRoutine tests should beperformed at room temperature 25 6 5C (72 6 9F) 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
41、points of the range if it has asteplessly adjustable response value.8.2.2 Testing of Self-Test FunctionThe internal 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 b
42、uilt-in indication meters, they must be checked so thatthey comply with the response tolerances according to 6.8. 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
43、 an ACtest voltage equal to twice the nominal systems voltage plus1000 V for a period of one second without breakdown 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 al
44、l terminals of each independent circuit. Notethat circuits having the same rated insulation voltage may beconnected 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;
45、 (b) between linked-independent circuits and linkedopen-contact circuits; (c) between linked independent circuitsand 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 Equipm
46、ent Manual9.1 The following data shall be included on all enclosuresfor insulation monitors:9.1.1 Name of manufacturer.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 T
47、est resistance value.9.1.8 Serial number or year of production.9.2 Manufacturers equipment manual shall provide 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 identif
48、y where the con-nections are to be made to the equipment being monitored.9.2.4 Nominal value of measuring signal.9.2.5 Maximum measurement current.9.2.6 Nominal contact voltage and current ratings for inte-gral relays in accordance with 6.7.9.2.7 A note advising that system leakage capacitance mayin
49、fluence the measurement.9.2.8 A note advising that only one monitor may be con-nected by means of galvanic circuit and that one monitor mustbe disconnected when two ungrounded systems containingindependent monitors are coupled together.10. Keywords10.1 AC electrical systems; DC components; DC electricalsystems; electrical insulation monitoring; electrical systems;ohmic insulation faultsF1669M 12 (2018)3ASTM International takes no position respecting the validity of any patent rights asserted in connection with any i
