1、NIL-F-24h3 bL 9997706 0089871 T B-iS-OCl MIL-F-24638(SH) 30 July 1984 MILITARY SPECIFICATION FREQUENCYCHANGER, SOLID STATE, AIR COOLED (NAVAL SHIPBOARD) This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Ag
2、encies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers solid state, air cooled frequency changers for the conversion of electrical power from 60 hertz (Hz), 3-phase, to 400 Hz, 3-phase, for non-nuclear power naval surface ship use. 2. APPLICABLE DOCUMENTS 2.1 Government d
3、ocuments. 2.1.1 Specifications, standards and handbook. Unless otherwise specified, the following specifications, standards and handbook of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DODISC) specified in the solicitation form a part of this spe
4、cification to the extent specified herein. SPECIFICATIONS FEDERAL PPP-P-40 - Packaging and Packing of Hand Tools. MILITARY MIL-B-117 - Bags, Sleeves and Tubing - Interior Packaging. MIL-S-901 - Shock Tests, H.I. (High-Impact); Shipboard Machinery, Equipment and Systems, Requirements for. MIL-(2-915
5、- Cable and Cord Electrical, for Shipboard Use General Specfication for. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, W
6、ashington, DC 20362 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 6130 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILITARY (Continued) MIL-C-915/3
7、2 - Cable, Electrical, 1000 Volts, Type MSCU (Including Variations MSCA and MSCS). MIL-E-9 17 - Electric Power Equipment, Basic Requirements (Naval Shipboard Use). MIL-E-2036 - Enclosures for Electric and Electronic Equip- ment, Naval Shipboard. MIL-M-7793 - Meter, Time Totalizing. MIL-P-15024 - Pla
8、tes, Tags and Bands for Identification of MIL-P-15024/5 - Plates, Identification. MIL-F-15160 - Fuses: Instrument, Power and Telephone. MIL-M-16034 - Meters, Electrical-Indicating (Switchboard MIL-M-16034/9 - Voltmeters, A.C. and D.C., Portable, MIL-En17555 - Electronic and Electrical Equipment, Acc
9、essxies, MIL-S-19500 - Semiconductor Devices, General Specification for. MIL-M-38510 - Microcircuits, General Specification for. Equipment . and Portable Types). 0.25-Percent Accuracy Class, and Repair Parts; Packaging and Packing of. STANDARDS MILITARY MIL-STD-108 - Definitions of and Basic Require
10、ments for Enclo- MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment sures for Electric and Electronic Equipment. (Type I - Environmental and Type II - Internally Excited) . MIL-STD-202 - Test Methods for Electronic and Electrical MIL-STD-454 - Standard General Requirements for Electronic M
11、IL-STD-461 Component Parts. Equipment. Requirements for the Control of Electromagnetic Interference. MIL-STD-462 - Electromagnetic Interference Characteristics, Measurement of . MIL-STD-471 - Maintainability Verification/Demonstration/ Evaluation. MIL-STD-740 - Airborne and Structureborne Noise Meas
12、urements and Acceptance Criteria of Shipboard Equipment. MIL-STD-781 - Reliability Tests, Exponential Distribution. MIL-STD-810 - Environmental Test Methods and Engineering MIL-STD-883 - Test Methods and Procedures for Microelectronics. MIL-STD-965 - Parts Control Program. MIL-STD-1310 - Shipboard B
13、onding, Grounding, and Other Techniques DOD-STD-1399, - Interface Standard for Shipboard Systems, Electric - Electromagnetic Emission and Susceptibility Guidelines . for Electromagnetic Compatibility and Safety. Section 300 Power, Alternating Current, (Metric). Provided by IHSNot for ResaleNo reprod
14、uction or networking permitted without license from IHS-,-,-1 1 MIL-F-24b3 bl m 9999906 OA7 with the exception of the NAVSEA drawing package defined by NAVSEA 46D1931-2. and this specification, NAVSEA should be consulted. If conflict exists between NAVSEA Drawing 46D1931-2 3, REQUIREMENTS 3.1 First
15、article. When Specified (see 6.2.1), a sample shall be subjected to first article inspection (see 4.4 and 6.3). 3.2 Performance. 3.2.1 Input power. The input to the equipment (see 6.4.1) shall be 440 volts (V), 60 Hz, 3-phase, 3-wire, ungrounded, type I power complying with the characteristics and r
16、anges as specified in DOD-STD-1399, section 300. Equip- ment shall not be damaged when the input voltage phase rotation is in a reverse order (AC-CB-BA). 3.2.1.1 Self-protection from input voltage variation and transient. When the equipment is supplying any load from no-load to rated-load, the equip
17、ment shall withstand, without damage or blowing of fuses, any input voltage or fre- quency variation or both outside the transient limits specified in DOD-STD-1399, section 300. limits, they may take any of the following conditions: When the input voltage and frequency exceed the input transient The
18、 input voltage instantly drops to zero. The input voltage drops between O and 82 percent of nominal and input: frequency drops between O and 92 percent of nominal. The voltage-frequency relation during the period shall be such that voltage will be maintained at nominal until the frequency drops down
19、 to about 83 percent of nominal, then the voltage drops in proportion to the frequency at a frequency less than 83 percent, and finally the input voltage collapses to zero at a frequency about 35 percent. (c) The input voltage rises to 150 percent of nominal or input fre- quency rises to 125 percent
20、 of nominal, or both. Upon return of the input voltage and frequency to the specified range (see 3,2.1), the equipment shall operate and supply the load with the same output voltage and frequency as that prior to the input power changes. of the equipment shall meet all requirements of this specifica
21、tion without any adjustment or replacement of parts. starting procedure (see 3.2.1.5) shall be used to restart the equipment, The performance I the equipment has shut off, normal 3.2.1.2 Self-protection from input spikes, When the equipment input voltage experiences a transient (line-to-line or line
22、-to-ground, or both) up to 2500 V, having a basic impulse level (BIL) wave shape as shown on figure 1, the equipment output voltage waveform shall not deviate from that specified in 3.2.2.8. function. in table I, Equipment shall continue to operate without shutting down or mal- The calculated 60 Hz
23、source surge impedance shall be as specified Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- v flIL-F-ZVb38 61 W 7997706 0089875 7 m MIL-F-24638(SH) TABLE I. Calculated 60 Hz source surge impedance. Navy type cable T14 T23 T5 O T7 5 TI00 T150 T200 T
24、300 T400 Current rating of cable in amperes at 5OoC 47 64 10 1 136 160 2 16 250 320 400 Surge impedance in ohms 26 26 20 20 19 18 18 18 17 3.2.1.3 Input current harmonics. When the equipment is powered by a 60 Hz sinusoidal voltage of the specified range (see 3.2.1) and with the equipment supplying
25、any load from no-load to rated-load, the total current harmonic con- tent shall be not more than 5 percent of the rated-load input current. Individ- ual harmonic currents from the 2nd harmonic through the 11th harmonic shall be not more than 4.5 percent. Individual harmonics above the 11th harmonic
26、until the 333 harmonic, shall be not more than 49.5/n percent, where n is the number of the harmonic. 3.2.1.4 Input current balance. When the equipment is supplying any load from 10 percent to rated-load and input 3-phase voltages are balanced within 4 V, the input current shall be balanced to the e
27、xtent that current in any input line shall not differ by more than 5 percent of the rated-load input current from the arithmetic average current of the three input lines. When the equipment is supplying any load from 10 percent to rated-load and input 3-phase voltages are unbalanced by 3 percent as
28、specified in DOD-STD-1399, section 300, the input current shall be balanced to the extent that the current in any input line shall not differ by more than 10 percent of the rated-load input current from the arithmetic average current of the three input lines. The 60 Hz source impedance shall be as s
29、pecified in table II. The 60 Hz source impedance for the 110 kilo- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-24638 6% m 7997706 0087876 7 m TABLE II. 60 Hz, maximum power source impedance in ohms.- Load power E actor 1.0 0.8 0.7 Load kVA
30、3-phase R X R XR X 440-V, 3 -phase H .z 60 I 1.2 1.510.077 0.058 0.077 11.4 0.077 O . 058 . 058 . 058 0.64 ,067 10.70 .O67 0.811 .O67 . 058 . 44 ,071 . 058 30 .30 . 058 ,058 33 ,067 ,058 .O58 .27 .O58 I .29 .23 .O58 .23 019 ,061 e22 .O61 * 22 ,061 I I . 069 20 a 069 .15 1 .O70 I .16 .O70 .O69 .16 .
31、O70 .17 . 16 15 .O60 .O69 .17 I .O69 . 069 . 069 L/ TO convert to per umit values: xpu = X(ohms) (kVA of load) 1000 (L-L 3.2.1.5 Starting time. Equipment shall accept any load from no-load to rated-load and operates in compliance with requirements specified herein, in not more than 5 seconds after s
32、tart. Equipment shall not require adjustments to meet these requirements, when the input voltage and frequency varies within the range specified in 3.2,l. 3.2.1.5.1 Prohibition of start. Equipment shall start when the input voltage is within the range of 409 V to 471 V and the input frequency is wit
33、hin the range of 57 to 63 1Iz. or the input frequency is outside the range where output power can be maintained (see 3.2.7.5). Equipment shall not be started when the input voltage, 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-Zib38 bl = 9
34、9999Ob 0089877 O W 3.2.1.6 Starting input current. Input current shall be limited during the starting time (see 3.2.1.5). The peak input starting (or in-rush) current shall be not greater than 150 percent of the peak full-load steady state input current. 3.2.1.7 No-load input current. The maximum no
35、-load input current shall be not greater than 10 percent of rated-load input current. 3.2.1.8 Grounding. Equipment shall operate as specified herein, when connected to an ungrounded ships input power system having 3 to 20 microfarad line or terminal intermittently or permanently grounded. % (VF) cap
36、acitance from any line to ground, or with any single input or output r 3.2.1.9 Input power factor. The input power factor presented to the 60 Hz input power by the equipment, shall be between 0.75 lagging and 0.9 leading. 3.2.2 Output voltage. Rated output voltage shall be 450 volts root mean square
37、 (Vrms). The output circuit shall be delta-connected, ungrounded, 3-phase, 3-wire, 400 Hz for all units. The phase rotation of the output voltage shall be a clockwise sequence of AB-BC-CA. 3.2.2.1 Voltage regulation. The average of the volt root mean square (Vrms) values of the output voltages shall
38、 be maintained at the regulated point (the equipment output terminals (see 3.2.2.2) within plus or minus 0.5 percent of rated output voltage, under the following variable conditions and any combi- - - nation thereof, at all voltage settings within the adjustment range as specified in 3.2.2.3: (a) A
39、voltage drop from the terminals of the equipment to the regulated point of any amount from O to 7 percent of rated output voltage, as specified in 3.2.2.2. (b) A load variation from no-load to 125 percent of rated-load. (c) (d) (e) Variation of the equipment temperature from cold start (at Load powe
40、r factor varying between 0.6 lagging and 0.9 leading. An input voltage and frequency variation within the range specified herein. ambient temperature ranging from O to 50 degrees Celsius (OC) to maximum operating temperature (at ambient temperature ranging from O to 50C). (f) Under the unbalanced lo
41、ad conditions specified in 3.2.2.11. 3.2.2.2 Line drop compensation. The converter shall be capable of com- pensating for a full-load line voltage drop to the load of 7 percent. While operating in the line drop compensation mode, the converter shall meet the voltage regulation requirements of 3.2.2.
42、1 at the load terminals. All other performance requirements of this specification shall be met at the converter output terminals. Line drop compensation shall not be applied to converters operating in parallel. , 7 i Provided by IHSNot for ResaleNo reproduction or networking permitted without licens
43、e from IHS-,-,-3.2.2.3 Voltage adjustment. Means shall be provided to adjust the output voltage at the regulated point over a range of plus or minus 5 percent of the rated voltage, with adjustment resolution not more than 50 millivolts at any load rom no-load to 125 percent rated-load under any stea
44、dy state input conditions. The adjustment device shall have a slotted shaft for screw-driver type adjustment0 A voltmeter shall be provided which will indicate the unit output voltages. 3.2,2.4 Transient output voltage and recovery. The sudden change of 0.9 lagging power factor loads on the equipmen
45、t from no-load to half-load, from half-load to rated-load, from rated-load to half-load, and from three-fourths load to one-ourth load shall cause an output voltage deviation of not more than plus or minus 5.0 percent of rated voltage. output terminals shall recover and stay within the steady state
46、regulation band (see 3,2,2,1), within 0.025 second. voltage transients developed within the equipment shall not reflect back into the input power system such that transient limits as specified in DOD-STD-1399, section 300, are exceeded for alternating current (a.c.) input (type I power). The voltage
47、 at the equipment Circuits shall be so designed that 3.2.2.5 Frequency regulation. Output frequency shall be maintained within plus or minus 0.1 percent of rated frequency under the following conditions or combinatfon thereof: (a) (b) (c) (d) Variation of the equipment temperature from cold start (a
48、t A load variation from no-load to rated-load. Load power factor varying between 0.6 lagging and 0.9 leading. An input voltage and frequency variation within the range specified herein. ambient temperature ranging from O to 50C) to maximum operating temperature (at ambient temperature ranging from O
49、 to 5OOC). (e) Variation of output voltage specified in 3.2.2.3. 3,2,2.6 Transient frequency deviation and recovery. A sudden change of 0.9 lagging power actor loads on the equipment from no-load to rated-load and from rated-load to no-load, shall not cause a frequency deviation greater than the steady state band specified in 3.2.2.5. 3.2.2.7 Amplitude and frequency modulation. Amplitude and frequency modulation o the output voltage (as spe
