Series Y5W5 and Y10W5 Zinc Oxide Surge Arresters

for Rated Voltage 3.8-468kV

Series Y5W5 and Y10W5 gapless zinc oxide surge arresters of rated voltage 3.8 - 468 kV are protective apparatus used for protecting AC transmission and transformation equipment against damage from atmospheric overvoltage and switching overvoltage. The products of series Y5W5 andY10W5 are manufactured according to manufacturing technology transferred from HITACHI Ltd. of JAP (Japan).Compared with silicon carbide surge arrester, zinc oxide arrester has superior protective characteristic, good reliability, high discharge capacity, and simple construction etc. thus, assuring the best overall protection for transmission and transformation equipment.

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Usually, the arrester is connected between system and ground in parallel with protected equipment. At continuous operating voltage, zinc oxide resistors appear to be an extremely high resistance, the resistive current through the arrester is of the order of microamperes. In appearance of a lightning stroke or switching surge on the system, the residual voltage across the terminals of the surge arrester will be limited to a certain permissible value because of the excellent non-linearity of resistors, and high surge energy of the line will be absorbed, thus the insulation of electrical equipment is protected.

Series Y5W5 and Y10W5 zinc oxide surge arresters can be used in the following conditions: ambient temperature -40 to +40;altitude above sea level up to 1000 m; with standing 8 earthquake intensity (horizontal acceleration 0.2g).

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Anti-vibration type, Anti-pollution type and plateau type arresters are available for special application. Anti-vibration type arresters are adoptable for using in an area with 9 earthquake intensity (horizontal acceleration 0.5g); anti-pollution type arresters for light or heavy polluted condition; and plateau type arresters for relative high altitude area.

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Series Y5W5 and Y10W5 zinc oxide surge arresters show an excellent protective performance, high capability to withstand lightning and switching overvoltage, good response characteristics to steep lightning impulse and superior anti-pollution property. The performance of the arresters meets the requirements of IEC 60099-4 part four "Gapless metal oxide surge arrester for A.C.system".

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