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After the 1970s, vacuum switches began to replace the minimal-oil switches in medium-voltage switchgear. In the early 1980s, SF6 switches and breakers were also gradually replaced by vacuum technology in medium-voltage application. As of 2018, a vacuum circuit breaker had reached 145 kV and the breaking current had reached 200 kA. [4]
Mobile Minuteman was a program for rail-based ICBMs to help increase survivability and for which the USAF released details on 12 October 1959. Minuteman Mobility Test Trains were first exercised from 20 June to 27 August 1960 at Hill Air Force Base, and the 4062nd Strategic Missile Wing (Mobile) was organized 1 December 1960. It was planned to ...
A light switch may cause a small, harmless spark when switched on or off. In an ordinary household this is of no concern, but if a flammable atmosphere is present, the arc might start an explosion. In many industrial, commercial, and scientific settings, the presence of such an atmosphere is a common, or at least commonly possible, occurrence.
The Soviets had much larger rockets and could use vacuum tubes in their guidance systems. The Minuteman I, II and III weighed 29,500 kg, 31,746 kg and 35,000 kg respectively, versus the Soviet R-7 missile (1959) at 280,000 kg. The US planners had to choose either to develop solid state guidance systems (which weigh less) or consider the ...
A pyrotechnic fastener (also called an explosive bolt, or pyro, within context) is a fastener, usually a nut or bolt, that incorporates a pyrotechnic charge that can be initiated remotely.
The previous Minuteman III command and control system, designated Command Data Buffer or CDB, required over 20 hours to retarget the entire Minuteman force and 30 minutes to retarget a single ICBM. REACT system needs less than 10 hours to retarget all missiles, while individual missiles can be retargeted in matter of minutes.
Until the 2003 rebranding featuring a modernized Sam the Minuteman, the logo featured the Concord Minute Man statue prominently. The U.S. Air Force named the LGM-30 Intercontinental Ballistic Missile the "Minuteman", which was designed for rapid deployment in the event of a nuclear attack. The "Minuteman III" LGM-30G remains in service.
The D-17B is a component of the NS-10Q missile guidance system for the Minuteman I, while the D-37C is a component of the NS-17 missile guidance system for the Minuteman II. There are many basic similarities between the two designs. They are both synchronous, serial machines with fixed head disks for primary memory.
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