1、 MIL-M- 21688A( SHIPS) 11August 1960 SUPERSEDING 14 January 1959 MIL-M-21688(SHIPS) MILITARY SPECIFICATION MEASURING SYSTEM, FLOAT CURRENT, SUBMARINE STORAGE BATTERY 1. SCOPE i. 1 This specification covers a system of equip- type I of Standard MIL-STD-167 and shall meet the Hi shockproof requirement
2、s of Specification MIL-S- 901. ment for Naval shipboard use to measure the float current supplied to a submarine main storage bat- tery . 3.1.1 A direct current (dc) current transformer or transductor. - The transductor shall be located in or on the battery buswork and shall be as speci- 2. APPLICAB
3、LE DOCUMENTS fied hereinafter (See 3.4). 2.1 The following specifications and standards, of the issue in effect on date of invitation for bids, form a part of this specification to the extent speci- fied herein: 3. i. 2 A controi unit containing rectifiers, coils, capacitors and other necessary comp
4、onents and wiring as approved, all arranged in a circuit to per- mit system performance as specified herein. SPECIFICATIONS MILITARY MIL-S-901 - Shockproof Equipment, Class HI (High-Impact), Shipboard Application, Tests for MIL-P-15736 - Power Supplies, Metallic MIL-M-16034 - Meters, Electrical-Indi
5、- Rectifier, Naval Shipboard cating (Switchboard and Portable Types) STANDARDS MILITARY MIL-STD-167 - Mechanical Vibrations of Shipboard Equipment (Copies of specifications, standards, drawings, and publications required by contractors in connection with specific procurement functions should be ob-
6、tained from the procuring activity or as directed by the contracting officer .) 3. REQUIREMENTS 3.1 Requirements. - The float current measuring system shall comprise three separate subassemblies as described in 3.1.1, 3.1.2 and 3.1.3. All subas- semblies shall meet the vibration requirements of 3.1.
7、3 A switchboard type electrical indicating meter in accordance with Specification MIL-M-16034 and as specified hereinafter (see 3.4.2) to be mounted separately. fication MIL-P-15736 and the following are appli- cable to this specification. 3.2 Definitions. - Definitions specified in Speci- 3.2.1 Tra
8、nsductor. - For purposes of this speci- fication, a transductor shall be defined as a static magnetic or semiconductor device which, when em- ploying a bus bar as a one-turn winding or source of magnetic field excitation will present, at termi- nals electrically isolated from the bus bar, a vol- tag
9、e or impedance which varies predictably with the magnitude, polarity, or both of the direct current flowing in the bus bar. 3.3 System operation requirements. - The above three major system components shall function as described below to accomplish specified current in- dication. The transductor sha
10、ll present a voltage or impedance to the control unit. The control unit shall furnish a signal to the meter, hence indicating bus bar current. The control unit shall provide any signal limiting which may be required by the meter, and any reference or bias signai which may be re- qi?ired by the trans
11、ductor. 3.4 Component requirements. - The components of the float current measuring system shall be as specified in tables I and II and in 3.4.1 and 3.4.2. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Table - I - Specific Requirements - Transducto
12、r -. - ._ _- Parameter DC Volts - (Bus Bar to Ground) DC Amperes (In Bus Bar) Polarity of Current (In Bus Bar) Short Circuit - Bus Bar, Amperes Change of Current (Bus Bar) Sensitivity Range Duty Enclosure Ambient Temperature Mounting Size and Weight - - - Table - Sp - P -*I_ Parameter AC Volte Frequ
13、ency Riase DC Output Accuracy Type of Load Enclosure Ambient Temperature Duty Mounting Connections Weight Heidit (inches maximum) Width (inches maximum) Depth (inches maximum) _ Requirement 355 0-4000 Any 50,000 2,000,000 Amps/Sec. Plus and Minus 20 Amperes (See 3.5) Continuous Dripproof Protected 2
14、3 to 50 C See 3.4.1 Minimum consistent with service required :Sic Requirements - Control Unit Requirement 115 rt 5 percent 60 cycles per second (C.P.S.) i 5 percent Single See 3.5 See 3.5 See 3.5 Open (on panel) 23 to 50 C Continuous Inside switchboard. Arrangement of mount. Terminal boards shall be
15、 provided for all Minimum consistent with service required 6, see figure 1 10, see figure 1 6, see figure 1 ing holes shai conform to figure 1 external connections Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-5 MIN I 22 MAX FRONT TRANSDUCTOR SH 51
16、95 FIGURE I - LIMITING DIMENSIONS, BULKHEAD MOUNTED TRANSDUCTOR 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3 -6 protection. - Bus bar current greater than 20 amperes sliall cause the meter indicator to be positioned without the marked portion
17、of the meter scale, but sliall not damage the meter. Bus bar cur- rent of 4000 amperes of either polarity, flowing con- tinuously, sliall have no effect on operation or accu- riicy of the system. Fault currents of 50,000 am- peres for 10 seconds sliall cause no damage to the system or any component
18、thereof. No damage shall result from rates of change of current up to 2,000,000 amperes per second. 3.7 Bliping. - In addition to the signal required oor specified cu7rent indication, the control unit sliall present to the meter damping impedance to in- sure meter stability. As defined by Specificat
19、ion MIL-Pif- 16034, the meter (wiien installed in circuit) shall liave a response time not less thlari 5 seconds aiid a damping factor not less than 10. to permit specified operation of the system over a range of distances between tlie transductor and the control unit. Tlie circuit or two-way resist
20、ance of ;I connecting cable from control unit to transductor, aiid return can be between O and 10 ohms. The nieter will ordinariIy be installed in the same switch- hnrd as the control unit. 3.9 Component parts and materials. - Require- ments fais as speci- fied by Specification MIL-P-15736 shall app
21、ly. 3.10 Prohibited components. - The use of bat- teries, electron tubes, relays and motors will not be allowed. 3.11 Semiconductor components. - Semiconductor components used in the transductor and control unit sliall be subject to approval of the bureau or agency coiicerned. Silicon is the preferr
22、ed rectifying agent for rectifiers. ance witmcable requirements of Specifi- cation MIL-P-15736. 3.13 Instruction sheet, - An instruction sheet, sealed in plastic, for resistance to coiling during handling shalLbe provided. It shall be attached to the control unit, but shall be easily removable. The
23、instruction slieet shall include a schematic and in- terconnection diagram of the system, and sufficient instructions to permit calibration of the system at installation. Typical currents and voltages in the circuit at specified conditions shall be included on the sciiematic, to aid troubleshooting.
24、 Components shall be identified. 3.8 Adjustments. - Adjustments shall be provided 3.12 Drawings. - Drawings shall be in accord- 4 3.14 Repair parts. - Onboard repair parts shall be furnished in accordance with the applicable re- quirements of Specification MIL-P-15736, and as specified (see 6.1). 4.
25、 QUALITY ASSURANCE PROVISONS 4.1 The supplier is responsible for the perfor- mance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his own or any other inspection facilities and services acceptable to the Government. Inspec- tion records of
26、 the examination and tests shall be kept complete and available to the Government as specified in the contract or order The Govern- ment reserves the right to perform any of the in- spections set forth in the specification where such inspections are deemed necessary to assure supplies and services c
27、onform to prescribed requirements. 4.2 Test. - The quality assurance provisions of Specification MIL- P- 15736 shali apply except quali- fication tests do not apply. The tests specified in 4.2.1, 4.2.2 and 4.2.3 shall be included in periodic tests. 4.2.1 Heating. - Heating tests to determine the tem
28、perature rise of the transductor and the control unit chail be conducted with the bus bar portion of the transductor carrying the full rated current of 4000 amperes direct current. The direct current for this test may be obtained from any available source, at any convenient voltage. Temperature rise
29、 measurements shall be made on the bus bar and any other components and windings which may be used on the transductor. Temperature rise of trans- formers, coils, rectifiers and like components of the control unit shall be made in accordance with the applicable requirements of Specification MIL-P- 15
30、736. 4.2.2 Accuracy of indication. - The bus bar current shali be successively adjusted to O, 5, 10, 15 and 20 amperes dc of each polarity. This test shall be run under all of the conditions of line vol- tagel frequency and ambient temperature specified in the applicable table of Specification ME-P-
31、15736, except that the line voltage will be varied plus or minus 5 percent, in lieu of 10 percent. The current supplied to the bus bar shall be derived from bat- teries, but may be at any convenient voltage. The actual and indicated values of current shall be com- pared to determine whether the floa
32、t charge meas- uring system operates with specified accuracy. No adjustment or recalibration will be allowed between the above test points to compensate for variations of the line voltage and frequency and ambient tem- perature. The above tests shall be conducted with Provided by IHSNot for ResaleNo
33、 reproduction or networking permitted without license from IHS-,-,-MIL-M-ZLbBA 20 7977706 0372007 2 the maximum value of 10 ohms resistance in the circuit between the transductor and the control unit (see 3.8). 4.2.3 Lead length compensation. - The bus bar current shall be adjusted to different valu
34、es, as speci- fied in 4.2.2, and the accuracy of the float current measuring system shall be checked with the minimum practical (no more than one-half an ohm) resistance connected between the transductor and the control unit. This test may be run at rated line voltage and frequency and any convenien
35、t ambient temperature. Recalibration will be permitted when the resistance value is changed. 5. PREPARATION FOR DELIVERY 5.1 Cleaning, preservation, packaging, packing and marking. - Equipment repair parts and technical manuals shall be cleaned, preserved, packaged, packed and marked for the level a
36、s specified (see 6.1) in accordance with Specification MIL-P-15736. 6. NOTES 6.1 Ordering data. - Procurement documents should specify the following: (a) Title, number,. and date of this specifi- cation. MIL-M-21688A( SHIPS) * of this specification. (b) Any exceptions taken to the requirements (c) N
37、umber of sets of onboard repair parts (d) Number of technical manuals required. (e) Required delivery date of drawings, tech- nical manuals, onboard repair parts and equipment. (f) Selection of the level of preservation and required (see 3.3.6). packaging and the level of packing required (see 5.1).
38、 Notice. - When Government drawings, specifi- cations, or other data are used for any purpose other than in connection with a definitely related Govern- ment procurement operation, the United States Government thereby incurs no responsibility nor any obligation whatsoever; and the fact that the Gove
39、rn- ment may have formulated, furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by implication or other- wise as in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, use, or seu any pat- ented invention that may in any way be related there- to. Preparing activity: Navy - Bureau of Ships (Project 6625-Nl40Sh) 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
