| 摘要 |
A "ready" indicator for high-voltage switchgear. The switchgear contains switches having normal positions (opened or closed) and switch operators therefor. The switch operators may include stored energy devices which may be charged or uncharged. The switch operators may be selectively coupled to or decoupled from their respective switches. The switchgear may include an automatic control device which, depending upon circuit conditions, causes operation of the switch operators to operate their respective switches to selected positions. Appropriate sensors detect the presence or absence of certain conditions. For example, the sensors may detect the ability or inability of the automatic control device to effect operation of the switch operators, the position of the switch operator or of the switches (open or closed), the charged or uncharged state of the stored energy devices in the switch operators, and whether or not the switch operators are properly coupled to their switches. The sensors provide signals to logic circuitry, which illuminates a light or energizes some other warning device if and only if all of the switch operators, automatic control devices, etc. are in a predetermined desired condition. The light is not illuminated in the event that any conditions of the switchgear are not appropriate or are other than might be assumed. Appropriate indicia may be associated with the light so that if not illuminated, the human operator is led step by step through a check of the switchgear until he ascertains which assumed condition is not present in preventing illumination of the light.
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