1、. MIL-S-ZLtLB 61 7777706 0087316 - Lt - - MIL- S- 241 88(SHIPS) 1 December 1965 MILITARY SPECIFICATION SYNCHRONIZING CONTROL EQUIPMENT, 60 CYCLES, 450 VOLTS, NAVAL SHIPBOARD 1. SCOPE 1.1 This specification covers general requirements for genegtor synchronizing monitor protective equipment for use wi
2、th generator sets rated up to 2500 kilowatts Shipboard Machinery, Equipment and Systems, MIL-E-917 - Electric Power Equipment, Basic Requirements (Naval Shipboard Use). MIL-D-963 - Drawings, Electrical, Hull and Mechanical Equipment for Naval Shipboard Use. MIL-R-2033 - Relays for Naval Shipboard El
3、ectrical Service. MIL-E-2036 - Enclosures for Electric and Electronic Equipment, Naval Shipboard. MIL-C-2174 - Controllers, Direct-Current, Naval Shipboard. MIL- C-2212 - Controllers, Alternating-Current, Naval Shipboard. MIL-C-3965 - Capacitors, Fixed, Nonsolid Electrolytic (Tantalum, Foil and Sint
4、ered-Slug), MIL-P-15024 - Plates, Identification-Information and Marking for Identification of Electrical, MIL-M-15071- Manuals, Equipment and Systems. MIL-R-15109 - Resistors and Rheostats (Naval Shipboard Use). MIL-P-15137 - Provisioning Technical Documentation for Repair Parts for Electrical and
5、MIL-S-15291 - Switches, Rotary, Snap Action. MIL-S-16036 - Switchgear, Power, Naval Shipboard. MIL-1-16104 - Indicators, Synchronization. MIL-T-16784 - Terminal Boards. MIL-E-17555 - Electronic and Electrical Equipment and Associated Repair Parts, Preparation for Delivery of. MIL-S-18396 - Switches,
6、 Meter and Control, Naval Shipboard. MIL-R-19523 - Relays, Auxiliary, Naval Shipboard. MIL-M-23313 - Maintainability Requirements for Shipboard and Shore Electronic Equipment and Requirements for. General Specification for. Electronic and Mechanical Equipment. . Mechanical Equipment (Naval Shipboard
7、 Use). Systems. E e,. 7- I .E .- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. STANDARDS MILITARY MIL-STD-16 - Electrical and Electronic Reference Designations. MIL-STD-167 - Mechanical Vibration of Shipboard Equipment. MIL-STD-242 - Electronic E
8、quipment Parts (Selected Standards). MIL-STD-761 - Electric Power, Alternating Current for Shipboard Use, Characteristics and Utilization of. MILITARY MIL-HDBK-217 - Reliability Stress and Failure Rate Data for Electronic Equipment. DRAWINGS BUREAU OF SHIPS 9000-86201-74453 - Naw Standard Switchboar
9、d Units. 9000-S6202-73907 - Liglk, indicator, Switchboard, 2 Lamp - SPF, Types B-27A through B-27G. PUBLICATIONS NAVSHIPS-93820 - Handbook for Prediction of Shipboard and Shore Electronic Equipment Reliability. (Copies of specifications, standards, drawings and publications required by suppliers in
10、connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer . ) 2.2 Other publications. - The following document forms a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in eff
11、ect on date of invitation for bids or request for proposal shall apply. OFFICIAL CLASSIFICATION COMMITTEE Uniform Freignt Classification Ratings, Rules and Regulations. (Application for copies should be addressed to the Official Classification Committee, 1 Park Avenue at 33rd Street, New York, N. Y.
12、 19916.) 3. REQUIREMENTS 3.1 General requirements. - This synchronizing control equipment is intended for mounting in the generator switchboard and arranged to electrically prevent closing of the generator circuit breaker, bus tie circuit breaker or shore power circuit breaker unless the energized s
13、ystems are properly synchronized. The control equipment shall perform its function through control of power to the breaker closing coil and shall be designed to operate on either 450 or 115 volts alternating current (a. c. ). NOTE: In general, three components should comprise one complete unit: one
14、device with alI operating components and terminal board for input and output signals; one operating switch with %operatingf, “test“, and “offf1 positions; one trander switch suitable for con- necting the equipment to generator circuit breakers, shore power circuit breakers or bus tie circuit breaker
15、s with input signals appropriately connected to generator and bus circuitry. The control equipment shall be arranged for back of the board mounting. The switches shall be arranged for back of switchboard mounting with operating handles at front of board. The equipment shall be designed to withstand
16、frequent use for long periods under service con- ditions without benefit of overhaul and with limited maintenance. The environmental conditions are outlined herein and the functional requirements are set forth in the individual equipment specifications. The finai product shall reflect the utmost in
17、simplicity, have maximum reliability and be easy to install and maintain. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-S-24L bL W 7777906 OO73L MIL-S-24188(SHIPS) . 3.1.1 Reliability and maintainability. - It is imperative that reliability of
18、 operation be considered of prime importance in the design and manufacture of the equipment. The contractor shall employ all reasonable methods possible in the process of manufacture which will assure quality and maximum reliability consistent with the state of the art. In the functional application
19、 of parts to equipment circuits, adequate factors of safety shall be provided by suitable derating from parts specification values where required in order to ensure high equipment reliability under all service conditions. The design shall include all possible features which will result in r.eliable
20、and stable operation with reduced requirements for adjustment and alignment, reduced requirements for maintenance and simplified maintenance, thus reducing requirements for highly skilled maintenance personnel. time between failure (MTBF). The reliability ) of the synchronizing control equipment is
21、the probability of the synchronizing control equipment operating without failure for a specified period of time (t). predicted MTBF, the reliability is given by 3.1.1.1 The reliability for the synchronizing control equipment shall be predicted in terms of mean For a -t/MTBF R=e The MTBF shall be pre
22、dicted using method D of NAVSHIPS 93820. Failure rate data used shall be as given in NAVSHIPS 93820, MIL-STD-242 and MIL-HDBK-217, choosing the .rate which most nearly corresponds to the application conditions of a given part in the power supply. If parts are used for which no failure rate data is g
23、iven in the above sources, failure rate data from other sources may be used, but justification for its applicability shall be provided. For parts for which no failure rate data is available, a failure rate shall be estimated, and the basis for the estimate stated. The derating factor which is used f
24、or each part shall be stated in the reliability calculations. The stress levels at which each part is operating shall be stated. The stress levels shall be those obtained from test insofar as such information is available. In those instances where test data is not available, design data shall be use
25、d. The stress levels shall be identified as whether from test or from design. 3.1.1.2 The reliability prediction shall be made for the continuous operating mode of this specification. 3.1.1.3 A mode failure is defined as occurring when the collective or individual component performance degrades belo
26、w the operating requirements of this specification. geometric mean time to repair (MTTRG). The MTTRG shall be determined in accordance with main- tainability evaluation procedure specified in MIL-M-23313. The failure rates used shall be those which have been determined in the reliability prediction.
27、 3.1.1.4 The maintainability of the synchronizing control equipment shall be predicted in terms of 3.1.1. 5 The contractors report on reliability and maintainability factors and calibrations shall be submitted with the detail drawings for review and approval action. 3.1.2 Life. - The equipment shall
28、 be designed for an expected 30-year life based on an average of, but not limited to, 10 operations per day. 3.1.3 Fail safe design. - The design of the equipment shall be such that failure of parts or sub- assemblies will not result in unsafe operating condition of the generating system. Fail safe
29、features shall not cause undue complexity or excessive increase in size or weight. 3.2 Environmental conditions. - All of the requirements of the individual specifications shall be met under any combination of the environmental conditions specified in 3.2.1 through 3.2.6. 3.2.1 Temperature condition
30、s. - 3.2.1.1 Ambient temperature. - Equipment shall be designed for an ambient temperature of 65OC. .- . :. 3 . . . . - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. I -_ 1 I MIL-S-243 b3 m 77777Ob 0087337 T MIL- S- 241 88 (SHIPS) I 3.2.2 Humidit
31、y. - Operation shall be possible at relative humidities up to 100 percent for both con- tinuous and intermittent periods, including conditions wherein condensation takes place on the equipment cover. 3.2.3 inclined operation. - Equipment shall give no change in operation when inclined at an angle of
32、 60 degrees from vertical.in any direction. to values of roll and pitch up to 60 degrees from vertical. No favorable orientation may be assumed. 3.2.4 Roll and pitch. - The equipment shall not be damaged or caused to malfunction when subjected 3.2.5 Vibration. - Equipment shall be designed to operat
33、e during and after the type I vibration test of MIL-STD- 167. 3.2.6 Shock. - Equipment shall be designed to be grade A, class I, type A in accordance with MIL-s- 901 .- I 3.3 Electrical design. - The equipment shall be in accordance with MIL-E-917, except as otherwise specified herein. If any requir
34、ement specified herein conflicts with the requirements of MIL-E-917, the requirements of this specification shall govern. 3.3.1 The equipment shall operate over the range of the type I power system characteristics specified in MIL-STD-761. 3.3.2 Electron tubes and printed circuits, - Electron tubes
35、and printed circuits shall not be used. 3.3.3 The equipment shall operate with electrically operated circuit breakers whose maximum breaker operating closing time is 500 milliseconds. 3.3.4 The equipment shall detect the difference in frequency between the oncoming generator and the bus and preyent
36、paralleling (closing of the electrically operated generator circuit breaker) unless the difference in frequency is less than O. 2 cycle per second (c. p. s. ). generator and operate to prevent closing of paralleling breaker unless this difference is within 5 percent of rated voltage. , bus and preve
37、nt paralleling (closing generator breaker) except when the phase angle difference is between minus 30 and zero electrical degrees. 3.3.5 The equipment shall detect the difference in voltage between the bus and the oncoming 38.6 The equipment shall detect the difference in phase angle between the onc
38、oming generator and the 3.3.7 The equipment shall prevent closing of the generator breaker if the breaker control switch is closed outside the limiting conditions noted in 3.3.4 through 3.3.6 herein. The circuitry shall further require reset of the breaker control switch to the tfoffft position befo
39、re paralleling (closing of the breaker) is again possible. 3.3.8 The equipment shall prevent the operator from using the synchronizing circuit as an automatic 3.3.9 A synchronizer control switch shall be provided in accordance with MIL-S-15291 or synchronizing device. MIL-S-18396 for switchboard mou
40、nting and shall have “operationpt, “test“ and ffofftt positions. 3.3.9.1 It shall be possible to transfer control of the switch from “operation“ to Yest“ to “offq1 and reverse without affecting any systems component while the generating equipment is operating at any load from no load to rated load.
41、3.3.10 An indicator light shall be included to indicate when this synchronizing control equipment is energized. The indicator light shall be in accordance with Drawing 9000-S6202-73907. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-2qLBB bL 7
42、7777Ob 0087320 b 9 MIL- S-24188 (SHIPS, . 3.3.11 Enclosure shall be dripproof protected in accordance with MIL-E-2036. Ready accessibility of all electrical connections, test points and adjustments shail be provided for convenience in installation and maintenance. Enclosures and framework shal be co
43、nstructed of steel, aluminum or both. The use of aluminum is considered desirable and shall be used if structurally suitable. Enclosure shall be of the dead-front type. 3.3.12 The synchronizing control equipment shall perform its primary electrical function through the use of approved solid state de
44、vices. Relays may be employed only where appcved by the bureau or agency concerned. Vacuum tubes or similar thermionic devices shall not be used. 6. lenium rectifiers shall not be used. 3.3.13 Miscellaneous component parts. - To best meet the requirements specified herein, it may be desirable to mak
45、e use of component parts not covered herein by referencedspecifications. These parts shaii be considered as miscellaneous component parts and may include such items as special semiconductors, special timing devices, special switches and special relays. The use of miscellaneous component parts shail
46、be permitted only when requested and when determined by the bureau or agency concerned that its use is necessary or desirable. Miscellaneous component parts shall be in compliance with MIL-E-917 insofar as practicable with deviations approved by the Bureau of Ships in each specific application. To d
47、etermine the need for and suitability of miscellaneous component parts, the manufacturer shall furnish technical data justifying its use and suitability and such other related data as may be requested by the Ehweau of Ships. Supplemental tests may be required on miscellaneous component parts to conf
48、irm suit- ability. These tests shall be conducted by the manufacturer as requested by the bureau or agency con- cerned. 3.3.14 Resistors and rheostats. - Resistors and rheostats shall be in accordance with MIL-R-15109. Where the required resistance and approximate wattage value is not covered by MIL
49、-R-15109, resistors in accordance with MIL-R-11, MIL-R-22, MIL-R-26 and MIL-R-94 may be substituted upon specific approval by the bureau or agency concerned. 3.3.15 Capacitors. - Capacitors shail be in accordance with MIL-C-3965 and MIL-C-25 for electro- 3.3.16 Transformers, reactors and inductors. - Transformers, reactors and inductors shall conform lytic and paper-dielectric types, respectively. to MIL-E-917. All units shallmeet the minimum material requirements. Transformers
