摘要 |
<p><P>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. <P>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 m<SB>10</SB>of 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 m<SB>10</SB>of 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. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |