| 摘要 |
PROBLEM TO BE SOLVED: To prevent development to burnt damage of a voltage measuring line caused by accidental short-circuiting of the voltage measuring line by installing a voltage measuring terminal through a resistor. SOLUTION: A voltage measuring terminal 50 is installed separately from a terminal board 20 to which electric power is supplied, and a resistor 60 is connected between the voltage measuring terminal 50 and the terminal board 20. By this circuit constitution, even if a short circuit is produced between voltage measuring lines 41, 42, current flowing in the voltage measuring lines 41, 42 is limited by the resistor 60, and development to an accident such as burnt damage of the voltage measuring lines 41, 42 is completely prevented. In addition, since a voltage measuring device 40 is not a circuit consuming current, current flowing through the voltage measuring lines 41, 42 during measurement is very small. Accordingly, even if the resistor 60 is inserted in series between the voltage measuring lines 41, 42, large error does not produce in a voltage value measured with the voltage measuring device 40. A voltage supply system with high safety is constituted.
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