公开(公告)号：US3922659A

公开(公告)日：1975-11-25

申请号：US49265774

申请日：1974-07-29

Applicant: BAXTER LABORATORIES INC

Inventor： DIGHE KAMALAKAR D

IPC: G01R19/145 ,  G01R31/02

CPC classification number: G01R19/145 ,  G01R31/021 ,  G01R31/024

Abstract: A power line fault indicating system adapted to be connected in parallel with an electrical appliance for detecting the most common power line faults. The system employs a neon lamp connected in an R-C oscillator circuit which is controlled by circuitry responding to power line conditions to provide any one of three states of the lamp, namely, steady energization of the lamp, blinking of the lamp, or steady deenergization of the lamp, depending on different conditions. The circuitry includes a power supply stage, a logic stage, an averaging and delay stage, and a driver stage connected to a resistor forming part of the oscillator discharge circuit branch and arranged so as to shortcircuit this resistor under normal power line circuit conditions and thereby allow the neon lamp to be steadily energized, and to remove the short circuit under certain abnormal power line conditions and thereby cause the oscillator to operate and provide blinking action of the lamp. Other abnormal power line conditions will prevent energization of the lamp.

Abstract translation: 一种电力线路故障指示系统，其适于与电器并联连接，用于检测最常见的电力线路故障。 该系统采用连接在RC振荡器电路中的氖灯，其由响应于电力线条件的电路控制，以提供灯的三种状态中的任何一种，即灯的稳定通电，灯的闪烁或稳定断电 灯具，取决于不同的条件。 该电路包括电源级，逻辑级，平均和延迟级以及连接到构成振荡器放电电路分支的一部分的电阻器的驱动级，并被布置成在正常电源线电路条件下使该电阻短路 从而允许霓虹灯稳定地通电，并且在某些异常电源线条件下去除短路，从而使振荡器工作并提供灯的闪烁动作。 其他异常电源线条件将阻止灯的通电。