Voltage surge arrester device
First Claim
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1. An overvoltage surge arrester comprising:
- at least one high-exponent varistor having an exponent greater than 10 for electrical connection between a voltage line and ground;
at least one low-exponent varistor having an exponent less than 10 in series with said high-exponent varistor for providing a more rapid voltage increase than for the high-exponent varistor; and
at least one shunt gap shunting said low-exponent varistor and a portion of said high-exponent varistor for reducing the arrester voltage during a condition of electrical overvoltage.
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Abstract
Voltage surge arrester devices having predetermined shunt gap sparkover voltages are provided by the series combination of high- and low-exponent varistors. In one embodiment the high-exponent varistor comprises zinc oxide and the low-exponent varistor comprises silicon carbide.
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Citations
9 Claims
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1. An overvoltage surge arrester comprising:
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at least one high-exponent varistor having an exponent greater than 10 for electrical connection between a voltage line and ground; at least one low-exponent varistor having an exponent less than 10 in series with said high-exponent varistor for providing a more rapid voltage increase than for the high-exponent varistor; and at least one shunt gap shunting said low-exponent varistor and a portion of said high-exponent varistor for reducing the arrester voltage during a condition of electrical overvoltage. - View Dependent Claims (2, 3, 4, 5)
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6. An electrical overvoltage surge arrester comprising:
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at least one first varistor having a first exponent for electrical coupling between a voltage line and ground for causing surge current to flow from said line to ground upon the condition of a voltage surge; at least one second varistor having a second exponent and electrically connected in series with said first varistor, the exponent of said second varistor being lower than the exponent of said first varistor for causing a faster voltage increase across said second varistor; and at least one shunt gap having a predetermined sparkover voltage across said first and second varistors for shunting current from said first and second varistors when said predetermined voltage appears across said shunt gap. - View Dependent Claims (7, 8, 9)
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Specification