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Development of high gradient zinc oxide nonlinear resistors and their application to surge arresters

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6 Author(s)
Imai, T. ; Toshiba Corp., Kawasaki, Japan ; Udagawa, T. ; Ando, H. ; Tanno, Y.
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Zinc oxide nonlinear resistors with double the conventional reference voltage gradient, while improving their protective characteristics and raising discharging capability, were developed and applied to tank-type surge arresters. On the basis of high-performance elements, which provide good protective characteristics, a simulation was performed on the relation between the composition of the raw material acid the current-voltage (I-V) characteristics, consequently achieving a higher reference voltage gradient and an improved I-V nonlinearity. Moreover, the discharging capability was raised by improving the thermal distribution in the element when a current is applied and reducing their pores. This, when applied to surge arresters, permitted the number of elements, with the same diameter as conventional elements, to be halved. As a result, the number of parts, size and weight of the surge arrester were reduced and its structure was simplified. A series of tank-type surge arresters using these elements for 66-550 kV power systems was developed, tested in various ways without problems, and applied in the field

Published in:

Power Delivery, IEEE Transactions on  (Volume:13 ,  Issue: 4 )

Date of Publication:

Oct 1998

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