VOLTAGE TRANSFORMER FOR GAGE, ELECTRIC FACILITY USING THE SAME, HIGH PRESSURE LOAD SWITCHING BOX, AND VOLTAGE/CURRENT TRANSFORMER FOR GAGE

摘要

PROBLEM TO BE SOLVED: To prevent burning of a voltage transformer for gage by avoiding an iron-resonance state of the voltage transformer for gage.

SOLUTION: In the voltage transformer for gage; an air load switch 10 is installed in a 3-phase AC electric path 30 formed of electric power receiving cables 30a to 30c for the phases A, B and C, and a capacitor 50 is connected in parallel with a primary winding m10of the voltage transformer 20 for gage built in such air load switch 10. Since the capacitor 50 is connected in parallel with the primary winding m10of the voltage transformer for gate 20, a parallel combined impedance formed of an inductive impedance of the voltage transformer for gage 20 and an capacitive impedance of electrical power receiving cable 30c can be changed to a capacitive impedance to prevent generation of the iron-resonance state.

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