| 摘要 |
<p>PURPOSE:To reduce the size of a transformer by providing a neutral grounding resistor using a ceramic liner resistor composed mainly of zinc oxide. CONSTITUTION:This transformer is provided with a neutral grounding resistor using a ceramic linear resistor 5 composed mainly of zinc oxide. In addition, another neutral grounding resistor using the same ceramic linear resistor 5 composed mainly of zinc oxide is incorporated in an insulating gas atmosphere. In addition, a third neutral grounding resistor using the same ceramic linear resistor 5 composed mainly of zinc oxide is installed to the outside of the transformer. The resistor is composed of 70-99.7mol% zinc oxide, 0.1-10mol% magnesium oxide, and 0.1-20mol% of at least one oxide selected from among Al2O3, Y2O2, Ga2O3, La2O3, and In2O3. Therefore a small-sized transformer can be obtained by using a linear resistor having a large switching surge resistance, small voltage nonlinear coefficient, and positive, small, and excellent temperature coefficient of resistance.</p> |
