1、Designation: F 1669M 96 (Reapproved 2007)METRICAn American National StandardStandard Specification forInsulation Monitors for Shipboard Electrical SystemsMetric1This standard is issued under the fixed designation F 1669M; the number immediately following the designation indicates the year oforiginal
2、 adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers two (2) types of electricalsystem insula
3、tion monitoring 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 permanent
4、lyinstalled 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
5、to be regarded as thestandard. 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
6、. It is the responsibility 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
7、Electrical Equipment22.2 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:MIL-STD-1399 (NAVY) Section 300A Interface Standardsfor Shipboard Systems; Electri
8、cal Power, AlternatingCurrent43. 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, nt
9、he 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 resistance at which an insulationmonitor will provide an alarm indication.3.1.4
10、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. Thisterm is used only in connection with protection against indirecthuman contac
11、ts, 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 spec
12、ificationshall 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.1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marin
13、e Technology and is the direct responsibility of Subcommittee F25.10 inElectrical.Current edition approved May 1, 2007. Published June 2007. Originallyapproved in 1996. Last previous edition approved in 2002 as F 1669M - 96(2002).2Available from Underwriters Laboratories (UL), 333 Pfingsten Rd., Nor
14、th-brook, 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.1Copyright
15、 ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.5 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, o
16、hm-meters, visual indicators, memory fault retention, and so forth.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 Require
17、ments6.1 Response of Insulation Monitor to a Step InputTheinsulation 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
18、begoverned by the expression:t s! #100 1 40 RI3 Cs! (1)whereRI= internal resistance of monitor, ohm, andCs= total system capacitance, farad.For example,t 5 124 sifRI5 120 000 ohm and Cs5 5 3 1026farad.6.2 Measuring Signal Voltage LimitsThe peak value ofthe measuring signal shall under all operating
19、conditions 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
20、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 exceed 0 to +50 % of the upper value of theset point range when measured at a room temperature of 25 65
21、C (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 System Voltage and FrequencyTheinsulation monitor shall perform as specified when operatingwith a syste
22、m voltage of 0115 % nominal over the frequencyrange 50400 hz.6.6 Self-TestThe insulation monitor shall include abuilt-in test device or be equipped with connection provisionsfor a separate device that shall be furnished with the equipmentwhich can verify the proper functioning for the monitor.6.7 Ou
23、tput RelayThe insulation monitor shall have pro-visions for an external (remote) audible or visual alarm tooperate when the insulation resistance value falls below theset-point value or a remote indication of the insulation resis-tance value of the ungrounded system, or both. Built-in relayscontacts
24、 for connection to an external alarm shall have acontinuous rating of at least 4 amperes at 250 VAC. The breakcapacity shall be at least 2 amps at 250 VAC (0.7 power factor)and 0.3 amps at 120 VDC.6.8 Built-In Display of Insulation ResistanceIf provisionsare made to indicate (display) the current in
25、sulation resistancelevel, then the manufacturer shall provide information as to theaccuracy of this indication during normal operating conditions.6.9 Clearance and Creepage DistancesThe insulationmonitor shall have protective spacings through air (clearance)and over surface (creepage) as stated in U
26、L 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. Operating Environment7.1 The insulation monitor shall reliably function over anambient temperature range of 0 t
27、o 50C (32 to 122F) and at arelative humidity of 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 exceed
28、ed 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 syste
29、m 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
30、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 end points of its range.These tests shall be done without connected capacitances. Thetest resistor must be d
31、ecreased 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 calibrat
32、ed.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 conf
33、irm 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 ImpedanceThe ac internalimpedance specified
34、 in 6.3 is verified without any input supplyvoltage, with an rms milliammeter and with an external powersupply wired between the linked measuring terminals and theF 1669M 96 (2007)2ground terminal. The power supply must have an ac outputrated at nominal voltage, nominal frequency, a harmonicdistorti
35、on 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 ResistanceThe externalpower supply must have a dc output rated at nominal systemvoltage. The monitors internal
36、 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 sothat they comply with the response tolerances laid down in 6.8.8.1.6 Testing the Impulse Voltage Withstand
37、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 functionscorrectly.8.2.1 Testing of Response ValueRoutine tests should beperformed at room temperature 25 6 5C (72
38、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 points of the range if it has asteplessly adjustable response value.8.2.2 Testing of Self-Test FunctionThe int
39、ernal 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
40、.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 an ac testvoltage equal to twice the nominal systems voltage plus 1000V for a period of one second without br
41、eakdown or flashover.The test voltages shall be applied directly to the terminals.Unless obvious, the independent circuits are those which are sodescribed by the manufacturer.8.2.4.1 Link all terminals of each independent circuit. Notethat circuits having the same rated insulation voltage may beconn
42、ected 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 circu
43、itsand 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 manu
44、facturer.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 provid
45、e 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.9.2.4 Nominal value of measuring signal.9.2.5 Maximum measurement current.9.2.6 Nominal contact voltage and current ratings fo
46、r 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 must bedisconnected when two ungrounded systems containing inde-pendent monitors are c
47、oupled together.10. Keywords10.1 ac electrical systems; dc components; dc electricalsystems; electrical insulation monitoring; electrical systems;ohmic insulation faultsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin
48、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.This standard is subject to revision at any time by the responsible technical committee and must
49、 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 shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard
