CORE BREAKAGE DETECTOR FOR SIGNAL LIGHTING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a core breakage detector capable of detecting the breakage of the core of a signal lighting apparatus of a traffic signal in an off state. SOLUTION: A minute current is fed through a current switching part 21 and a relay contact circuit 11 to the signal lighting apparatus among signal lighting apparatus 10A to 10C in the off state for the traffic signal 10 installed at an inlet between closed districts based on control information from an electronic interlocking device 12 so that the signal lighting apparatus does not come into a lit state, a current level flowing through the signal lighting apparatus is detected by a current sensor 22, and the detection level is determined for a threshold by a determination part 23 to determine the presence or absence of the breakage of the core.