| 摘要 |
<p>PURPOSE:To make it possible even for a layman on electricity to discover the abnormality of a transformer by operating an alarm device and to improve safety by winding a resistance coil, a resistance value of which alters due to a temperature change by operation, on a general-purpose transformer circuit only by required number. CONSTITUTION:A resistance coil 4, a resistance value of which varies due to a temperature change by operation, is wound on a general-purpose transformer circuit composed of a primary coil 1 and a secondary coil 2 and a core 3 only by required number. The resistance coil 4 has electromotive force, but electromotive force is lowered when the load currents of the secondary coil 2 are increased and the magnetic flux of the core 3 is saturated, and an ammeter 6 cannot be swung sufficiently through a resistor 5 for adjusting currents. When the temperature of a transformer is elevated by the change of peripheral environment even at the time of enough electromotive force, the resistance of the resistance coil is augmented, and the ammeter 6 cannot be swung sufficiently. The alarm actuating contact 7 of the ammeter 6 is operated even in either case, and the transformer is protected from the saturation of magnetic flux, a temperature rise, etc., by an alarm device, a signal, etc.</p> |
