To obtain a gas-insulated transformer for an electrical apparatus, which is highly precise while being simple in constructed, and which requires no grounded shield.
The gas-insulated transformer for an electrical apparatus is applied to a gas-insulated electrical apparatus having a circular grounding receptacle, in which an insulated arc-extinction gas is filled and high-voltage conductors are arranged. The gas-insulated transformer comprises a capacitor-type voltage divider, having a floating electrode fixed at a position facing a high-voltage conductor via a hermetically-sealed insulating terminal mounted on a flange-shaped branch pipe which is provided on the inner face of the circular grounding receptacle; a voltage-dividing ohmic resistor, which is mounted on the outer circumferential surface of the circular grounding receptacle, is grounded at one end while the other end is connected to the floating electrode via the capacitor-type voltage divider, and has a sufficiently low impedance, as compared to the impedance between the floating electrode and the circular grounding receptacle; and a converter unit which is connected in parallel to the voltage-dividing ohmic resistor, has an input impedance sufficiently higher than the resistance value of the voltage-dividing ohmic resistor, and converts the detected voltage of the high-voltage conductor into a voltage that can be processed in the secondary side.
AOKI HIROHIDE
HANEUMA HIROYUKI
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