| 摘要 |
PURPOSE:To detect the position of an out-lighted light by connecting the light and a voltage detector with a secondary coil of a transformer, connecting a light emitting means to light off when the light is burnt out with the voltage detector, and making a remote indication of this. CONSTITUTION:A lighting means 7 is lighted by a secondary voltage of a voltage detector 6 when a light L is lighted normally. Output voltages of current detecting transformers 10, 11 are equal, therefore DC voltages of diodes D1, D2 are equal, and a TRIAC switch is not continuing. If the light L is lighted out by burning out, a secondary coil S becomes open. Outputs of the transformers 10, 11 disappear by this, and because a discharge time constant C1R1>>C2R2, the voltage of a resistance R2 becomes lower than the voltage of R1 rapidly, and the TRIAC switch continues, while the coil S is closed through a resistance R3. In the meanswhile, the light emitting means 7 changes to a light-out condition, which is indicated remotely at a concentrated monitoring panel 9 by an optical fiber 16. |
