Voltage surge arrester with capacitive grading and improved...

Details Voltage surge arrester with capacitive grading and improved... Voltage surge arrester with capacitive grading and improved...

H - Electricity

02

H

317/19

H02H 9/06 (2006.01)

Patent

CA 1061402

ABSTRACT OF THE DISCLOSURE The arrester includes a plurality of gap units and nonlinear resistance valve units connected in series between the line voltage and ground. A series line of capacitors across the gap units provides capacitive grading for fast high frequency impulses. A series line of resistors across the gap units provides resistive grading for slow, low frequency impulses. The gap units comprise control gap units for controlling the initial sparkover of the arrester and cascade gap units. The control gap units all have substantially equal sparkover voltages for slow impules. The improvement comprises that there is connected across at least one of the control gap units and in series with the series line of capacitors, a linear upset resistor having a resistance chosen so that the time constant of the resistor and capacitive grading line is about 0.25 micro- seconds.

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