1、BRITISH STANDARD AEROSPACE SERIESBS 3G 100-4.1.1:1982ISO 2678:1977Specification forGeneral requirements for equipment for use in aircraft Part 4: Electrical equipment Section 1: Construction and general Subsection 1.1: Electrical insulation testsISO title: Environmental tests for aircraft equipment
2、Part 4.3: Insulation resistance and high voltage tests for electrical equipmentUDC 629.7.05/.06:621.317.333BS 3G 100-4.1.1:1982This British Standard, having been prepared under the direction of the Aerospace Standards Committee, was published under the authority of the Board of BSI and comes into ef
3、fect on 30 November 1982 BSI 01-2000First published October 1973First revision November 1982The following BSI references relate to the work on this standard:Committee reference ACE/41Draft for comment 76/77350 DCISBN 0 580 12996 9Amendments issued since publicationAmd. No. Date of issue CommentsBS 3
4、G 100-4.1.1:1982 BSI 01-2000 iContentsPageNational foreword ii0 Introduction 11 Scope and field of application 12 Reference 13 Definitions 14 Requirements 15 Testing 26 Test report 2Table 1 Minimum values for high voltage tests 1Table 2 Minimum values for insulation resistance 2Publications referred
5、 to Inside back coverBS 3G 100-4.1.1:1982ii BSI 01-2000National forewordThis British Standard is identical with ISO 2678:1977 “Environmental tests for aircraft equipment Part 4.3: Insulation resistance and high voltage tests for electrical equipment”, published by the International Organization for
6、Standardization (ISO). It replaces BS 3G 100-4.1.1:1973 which is withdrawn and takes account of international agreement by the Technical Committee TC 20 of ISO in relation to electrical insulation requirements.The standard is part of the composite standard BS 3G 100 in the Aerospace Series of Britis
7、h Standards specifying general requirements for equipment in aircraft. An introduction to the complete British Standard is given in BS 3G 100-0 “Introduction”.This standard should be read in conjunction with BS 3G 100-0 or BS G 229 (see cross-reference) which explain the application of their require
8、ments in relation to individual aerospace equipment standards.Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in Briti
9、sh Standards; attention is drawn especially to the following.The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should
10、 be read as “British Standard”.Cross-reference. This standard makes reference to ISO 2650:1974 which has now been withdrawn and replaced by ISO 7137:1981 “Aircraft Environmental conditions and test procedures for airborne equipment”. An identical British Standard to ISO 7137 is BS G 229:1982 “Schedu
11、le for environmental conditions and test procedures for airborne equipment”.A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer
12、 immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in
13、the amendment table on the inside front cover.BS 3G 100-4.1.1:1982 BSI 01-2000 10 IntroductionThe operational safety of electrical equipment for aircraft requires a good quality of insulation and the avoidance of excess voltages. Dimensions and quality of the insulation have to be suitable for the o
14、perating voltages and the effects of climatic conditions encountered, such as temperature, humidity, atmospheric pressure and surface contamination. The trend to smaller and safer designs can only be realized if the physical properties and the behaviour of the insulation are known and proven by accu
15、rate test procedures.Insulation resistance measurements and high voltage testing have to be considered as two different tests. A high insulation resistance alone does not prove that the insulation is free from defects: cracks, for instance, may exist, provoking voltage flash-overs.0.1 Purpose of hig
16、h voltage testThe high voltage test serves to prove the capability of the insulation to withstand the effects induced by an electrical field.0.2 Purpose of insulation resistance measurementsInsulation resistance measurements serve to prove that electrical equipment has an adequate insulation resista
17、nce capable of preventing leakage currents passing through the insulation from reaching non-permitted values; this applies especially to maintaining the insulation properties under the effects of climatic conditions, such as temperature, humidity and surface contamination.0.3 Purpose of leakage curr
18、ent measurementsThis type of measurement may be applied to equipment where semi-conductors are used. The test voltage is dependent on the rated voltage of the component.1 Scope and field of applicationThis International Standard specifies requirements for tests to determine the electrical insulation
19、 resistance of equipment intended for use in aircraft, together with a high voltage test. It relates the insulation requirements to four categories of equipment.This International Standard does not relate to the insulation testing of equipment installed in aircraft.2 ReferenceISO 2650, Environmental
20、 tests for aircraft equipment Part 1: Scope and applicability. 3 Definitions3.1 means of insulationthe gaseous, liquid or solid material constituting the insulation3.2 insulationthe total of the insulation material in its final technical form3.3 insulation capabilitythe capability of withstanding al
21、l voltages up to the appropriate test voltage level3.4 rated voltagethe voltage specified in the electrical equipment identification and to which certain operating characteristics are related4 Requirements4.1 High voltageThe high voltage test shall be detailed in the relevant equipment specification
22、. The requirements for an adequate insulation capability shall be deemed to be met when the insulation withstands the test voltages specified in Table 1. In the case of a repetition of the high voltage test, only 80 % of the test voltage of Table 1 shall be applied. The same applies to used or repai
23、red equipment.High voltage tests shall not be performed on equipment incorporating semi-conductors which cannot be disconnected from their electrical connections or bridged, and which would therefore be destroyed.4.1.1 Voltage valuesAll a.c. voltages stated are r.m.s. voltages, the testing being car
24、ried out under standard sea level conditions.Table 1 Minimum values for high voltage tests4.2 Insulation resistanceThe requirements for an adequate insulation resistance shall be detailed in the relevant equipment specification. They shall be deemed to be met when the minimum values of Table 2 are o
25、btained.Rated voltage Test voltage Duration28 V, d.c. 500 V, 50 to 60 Hz 1 min115/200 V, a.c. 1 000 V, 50 to 60 Hz 1 min28 V, d.c. 600 V, 50 to 60 Hz 5 to 10 s115/200 V, a.c. 1 500 V, 50 to 60 Hz 5 to 10 sBS 3G 100-4.1.1:19822 BSI 01-2000Table 2 Minimum values for insulation resistance4.3 Leakage cu
26、rrentThe requirement for a sufficiently small leakage current shall be deemed to be met when it does not exceed 3 A.5 Testing5.1 High voltage testThe test shall be performed utilizing sinusoidal a.c. voltage.The voltage shall be increased continuously from zero to the value specified in Table 1 and
27、shall be maintained for the test duration indicated. Thereafter the voltage shall be decreased to zero. The rate of voltage variation shall not exceed 500 V/s. The test voltage shall be applied between the terminals of the equipment and its case (earth), and between other parts as specified in the r
28、elevant equipment specification.5.2 Insulation resistance testThe test voltage shall be 500 25 V, d.c. The insulation resistance shall be measured between live parts as well as between live parts and case (earth). Insulation resistance measurements shall only be taken after the measuring indicator h
29、as stabilized.5.3 Leakage current measurementsA pure d.c. source, for example a battery, shall be used for the measurements. The test voltage shall be 28 V 2 V, d.c. A 0,5 M resistor shall be connected in series with the test voltage source.The leakage current of the equipment, sub-assembly, card, i
30、ncluding all components, shall be measured between:a) individual circuits not normally connected together, andb) the case (earth) and all live parts connected together.6 Test reportA test report shall be supplied listing the following items, making reference to the relevant clauses, where appropriat
31、e, of this International Standard:a) type, designation, standard of the electrical equipment;b) associated electrical diagrams;c) test and/or measuring method;d) test voltage, measuring voltage, dwell time;e) measuring equipment and facilities utilized, with stock number and date of last calibration
32、;f) ambient temperature and relative humidity during test;g) test results and measured values;h) other observations;i) test date;j) signature of the person responsible for the test.Category EquipmentInsulation resistance (minimum values) between live parts and case (earth), and between live parts MI
33、n conjunction with climatic testaIn conjunction with non-climatic testbA Wiring components (terminal blocks, connectors, selectors, limit switches, circuit-breakers, relay contacts or contactors)50 100B Rotating machinery 0,5 20C Equipment incorporating electronic components2 10bD Indicating instrum
34、ents and equipment other than those in categories A, B or C520a The climatic tests referred to are listed in ISO 2650.b When measuring the insulation resistance of individual assemblies, the minimum value shall be increased to 50 M.BS 3G 100-4.1.1:1982 BSI 01-2000Publications referred toSee national
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