1、MIL-I-1361C 17 October 1985 SUPERSEDING MIL-I-1361B 7 October 1965 (See 6.6) MILITARY SPECIFICATION INSTRUMENT AUXILIARIES, ELECTRICAL MEASURING: SHUNTS, RESISTORS, AND TRANSFORMERS This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scop
2、e. This specification covers electrical measuring instrument auxiliaries as follows (see 6.1 and 6.2.1): (a) Shunts (b) Resistors (c) Current transformers (dl Potential transformers (e) Current transformer protective devices 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and
3、standards. The following specifications and standards form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplem
4、ent thereto, cited in the solicitation. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document shall be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using
5、the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 6625 DISTRIBUTION STATEMENT A Approved for public release; distribution unlimited Provided by IHSNot for ResaleNo reproduction or networking permitted without licen
6、se from IHS-,-,-MIL-I-13bLC bb 9 779790b 0324OL7 T MIL-I-1361C SPECIFICATIONS MILITARY MIL-S-9 0 1 - Shock Tests, H.I. (High-Impact); Shipboard Machinery, Equipment and Systems, Requirements for (Naval Shipboard Use). Equipment MIL-E-9 17 - Electric Power Equipment, Basic Requirements MIL-P-15024 -
7、Plates, Tags and Bands for Identification of MIL-P-15024/5 - Plates, Identification. MIL-E-17555 - Electronic and Electrical Equipment, Accessories, and Provisioned Items (Repair Parts) : Packaging of. STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection MIL-STD-195 - Marki
8、ng of Connections for Electric Assemblies. MIL-STD-202 - Test Methods for Electronic and Electrical MIL-STD-454 - Standard General Requirements for Electronic by Attributes. Component Par t s. Equipment . (Copies of specifications and standards required by contractors in connec- tion with specific a
9、cquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) 2.2 Other publications. The following documents form a part of this speci- fication to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD
10、 adopted shall be those listed in the issue of the DoDISS specified in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS shall be the issue of the nongovernment docu- ments which is current on the date of the solicitation. AMERICAN NATIONAL STANDARDS INST
11、ITUTE (ANSI) C57.13 Instrument Transformers, Requirements for. (Application for copies should be addressed to the American National Standards Institute, 1430 Broadway, New York, NY 10018.) UNIFORM CLASSIFICATION COMMITTEE AGENT Uniform Freight Classification Ratings, Rules and Regulations (Applicati
12、on for copies should be addressed to the Uniform Classification Committee Agent, Tariff Publication Officer, Room 1106, 222 South Riverside Plaza, Chicago, IL 60606.) (Nongovernment standards and other publications are normally available from the organizations which prepare or which distribute the d
13、ocuments. These documents also may be available in or through libraries or other informational services.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-It361C bb W 99999Ob 0124020 b m MIL-I-1361C 2.3 Order of precedence. In the event of a c
14、onflict between the text of this specification and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this specifi- cation shall take precedence. Nothing in this specification, however, shall supersede applicable laws and regu
15、lations unless a specific exemption has been obtained. 3 REQUIREMENTS 3.1 First article. When specified in the contract or purchase order, a sample shall be subjected to first article inspection (see 4.4 and 6.3). 3.2 General requirements. The following general requirements applying to the instrumen
16、t auxiliaries covered by this specification shall be in accordance with MIL-E-917 (see 4.6 and 4.7.2): Creepage and clearance distances Corrosion-resistant treatment Connection marking Insulation, electrical, including encapsulants Safety Prohibited materials Soldering Threaded parts Toxic materials
17、 Temperature measurement 3.3 Dielectric strength. When tested in accordance with 4.7.1, the instrument auxiliaries shall withstand the voltage values shown in table I. TABLE I. Dielectric. strength design values. I Name of part I Ac rms voltage I i Shunts : For portable instruments 1500 For switchbo
18、ard mounting 100 plus two times rated voltage Resistors 1000 plus two times rated voltage Current transformer 2000 plus 2-1/4 times rated voltage 2500 (secondary) (primary 1 Potential transformers 1000 plus two times rated voltage (primary and secondary) Protective devices 1500 3 Provided by IHSNot
19、for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-13bLC 66 997990b 0129021 8 MIL-I-1361C 3.4 Temperature rise. When tested in accordance with 4.7.10, the temper- ature rise shall be not greater than the values shown in table II. TABLE II. Temperature rise. I 1 I Na
20、me of part Temperature rise (50C ambient) Shunts Value which will not cause physical damage Resistors Class B insulation 75OC Current and potential transformers Class A 55OC Class B 75C Current transformer Value which will not cause protective device physical damage 3.5 Shock. Instrument auxiliaries
21、 and protective devices shall withstand the grade A, class I, type C shock test for lightweight equipment in accordance with MIL-S-901. 3.6 Insulation resistance. Insulation resistance shall be measured between 500 and 1000 volts direct current (Vdc) and shall be not less than 10 megohms. 3.7 Silver
22、-plated terminals. Connections and terminals for all equipment except resistors shall be silver-plated, except terminals below 30 amperes may be tin plated. Tin plating shall be 0.0005 inch thick. 3.8 Shunts. 3.8.1 Material. Shunts shall consist of an alloy with a minimum temper- ature coefficient o
23、f resistance up to the rated capacity. 3.8.2 Construction. Fabrication shall be by brazing or silver soldering. Soft solder shall not be used. 3.8.3 Thermal electromotive force. The thermal electromotive force produced by continuous operation of the shunt at rated current shall be not greater than t
24、he value which would cause a change in the reading (at rated current) of 0.25 percent. The connections to the circuit shall be made so that the opportunity for the escape of heat shall be equal at both terminals. 3.8.4 Polarity. Shunts shall be regarded as being without polarity until installed. Pro
25、vided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.8.5 Resistance. Resistance shall be as specified (see 6.2.1). 3.8.7 Voltage drop. The voltage drop at rated current shall be as follows within 0.25 percent (see 6.2.1): (a) 50 or 100 millivolts for direc
26、t current (dc) switchboard shunts. (b) 50, 100, or 200 millivolts, as approved for dc portable shunts. 3.8.8 Leads. 3.8.8.1 Insulation. Shunt leads shall be Insulated flexible conductors. The insulating material shall have a wall thickness of not less than 3/64 inch and a heavy outer braid of cotton
27、 or synthetic fiber. 3.8.8.2 Length, The length of the leads shall be not less than 3 feet for portable shunts and not less than 5 feet but not greater than 8 feet for switch- board shunts. 3.8.8.3 Terminals. The leads shall be provided with properly sized flat terminals at both ends. The terminals
28、shall be of the closed type for switch- board instruments. 3.8.8.4 Lead resistance. Lead resistance shall be as specified (see 6.2.1) for the instrument with which the leads are to be used. 3.9 Resistors. ” 3.9.1 Overload and humidity. Resistors shall withstand the overload and humidity test specifi
29、ed in 4.7.5. 3.9.2 Resistor tolerance. The total resistance of resistors shall not differ from the design value by more than 0.5 percent. 3.9.3 Resistance value. The resistance value shall be as specified (see 6.2.1). 3.9.4 Resistor mounting. Mounting means and dimensions and overall dimensions of c
30、age mounted (separate from the instrument) resistors shall be as approved by the command or activity concerned. 3.10 Current transformers. 3.10.1 Construction. The transformers shall be either sealed or encap- sulated. 3.10.2 Primary current and secondary current. The primary and secondary currents
31、shall be as specified (see 6.2.1). 3.10.3 Current transformer mounting. The mounting for current transformers shall be portable, switchboard, bar, wound, or window as specified (see 6.2.1). 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-I-L3b
32、LC bb m 9997906 032q023 L m MIL-I-1361C 3.10.4 Polarity and terminal markings for current transformers. 3.10.4.1 Arrangement of terminals. The terminals of all current trans- formers shall be arranged with regard to instantaneous polarities. 3.10.4.2 Current transformer polarity marking. Current tra
33、nsformers shall be subtractive and shall be so marked in accordance with MIL-STD-195. These polarity markings shall not be obliterable by paint. They may, however, be supplemented by a durable white paint on the respective primary and secondary terminal. 3.10.5 Current transformer frequency range. N
34、o change of current trans- former accuracy shall result from frequency change of the current being measured over the range of plus or minus 10 percent of design value. This design value shall be either 60 or 400 hertz (Hz) as specified (see 6.2.1). 3.10.6 Current transformer accuracy and ratio error
35、. Current transformers shall not exceed the ratio error and phase angle limitations shown in table III at rated frequency for the service specified (see 6.2.1). TABLE III. Current transformer ratio error and phase angle. Service Navy primary service (WS) Navy secondary service (NSS) General usage (G
36、U) 0.3 0.6 1.2 Percent of rated current 10 100 - + 10 100 - + 10 100 5 10 10 10 Phase angle Minutes (plus or minus) 20 10 40 20 80 40 Ratio error limits (maximum) Percent (plus or minus) 0.50 0.25 1 .o0 0.50 2.00 1 .o0 - 1/ The ANSI C57.13 designations are a combination of that shown in tables III a
37、nd IV, for example 0.3B-0.1. 3.10.6.1 Current transformer burden. Current transformers shall be furnished in the burdens (at rated current of voltage and frequency) specified in table IV with relation to the accuracy specified in the acquisition document (see 6.2.1). 6 Provided by IHSNot for ResaleN
38、o reproduction or networking permitted without license from IHS-,-,-MIL-I-13bLC bb m 777770b 0124024 3 W MIL-I-1361C TABLE IV. Current transformer.burden. Volt-amperes ANSI designatio in no case shall this interval exceed 6 hours. (2) Encapsulated transformers, including molded or embedded (g) Visua
39、l examination: Transformers and inductors shall be examined for any visible damage, including corrosion and obliteration of marking. 4.8 Inspection of packaging. Sample packages and packs, and the inspection of the preservation-packaging, packing and marking for shipment and storage shall be in acco
40、rdance with the requirements of section 5 and the documents specified therein. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-tlIL-I-13bLC bb D 99999Ob 012q035 B m YIL-I-1361C 5. PACKAGING (The packaging requirements specified herein apply only for
41、direct Govern- ment acquisition. For the extent of applicability of the packaging requirements of referenced documents listed in section 2, see 6.5.) 5.1 Domestic shipment and early equipment installation. 5.1.1 Preservation and packaging. Preservation and packaging, which may be the contractors com
42、mercial practice, shall afford adequate protection against corrosion, deterioration, and physical damage during shipment from the supply source to the using activity and until early installation. 5.1.2 Packing. Packing shall be accomplished in a manner which will insure acceptance by common carrier
43、at the lowest rate and will afford protection against physical or mechanical damage during direct shipment from the supply source to the using activity for early installation. The shipping containers or method of pack- ing shall conform to the Uniform Freight Classification Ratings, Rules, and Regu-
44、 lations, or other carrier regulations as applicable to the mode of transportation, and may conform to the contractors commercial practice. 5.1.3 Marking. Shipment marking information shall be provided on interior packages and exterior shipping containers in accordance with the contractors commercia
45、l practice. The information shall include nomenclature, Federal stock number or manufacturers part number, contract or order number, contractors name, and destination. 5.2 Domestic shipment and storage or overseas shipment. 5.2.1 Preservation and packaging, packing, and marking. The equipment, acces
46、sories and technical publications shall be preserved and packaged at level A or C, packed at level A, B, or C, as specified in the acquisition document (see 6.2.1), and marked in accordance with MIL-E-17555. Method II shall apply for level A packing of equipment. 6. NOTES 6.1 Intended use. The elect
47、rical measuring instrument auxiliaries covered by this specification are intended for general use to extend the scale range of measuring instruments or to provide low current for relay circuits. Shunts and current transformer are for use in current circuits to extend their scale ranges. Resistors an
48、d potential transformers are for use in potential circuits to extend their scale ranges. Current transformers for relay service provide low current for relay circuits. Current transformer protective devices protect the secondary side of current transformers against excess voltage. 18 Provided by IHS
49、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-6.2 Ordering data. 6.201 Acquisition requirements. Acquisition documents should specify the following : (a) Title, number, and date of this specification. (b) Type of instrument auxiliary required (see 1.1). Specific information for each type should be specified as follows: (1) Shunts a. Resistance (see 3.8.5) b. Mounting (s
