Introduction

For over 30 years, Ohio Brass has been supplying surge arresters to the electric utility industry. Many unique physical and electrical design changes have been introduced for:

• achieving more compact arrester dimensions
• significantly reducing equipment costs through drastic reductions in insulation levels
• greatly improving protection performance for greater system reliability.

DynaVar® station class arresters, with metal-oxide varistor design, provide improved operating characteristics over silicone-carbide design arresters. They offer superior protective capability and durability under natural and system-generated surge duty.

All VL, VLA & VN DynaVar Station Class Surge Arresters in this catalog comply with ANSI/IEEE Standard C62.11.

Description and Operation

Maximum Operating Altitudes

DynaVar station arresters can be applied at the altitudes listed below. For special altitude applications, contact your Ohio Brass representative.

Arrester Type	Maximum Altitude Above Sea Level
	feet	meters
VLA, VL, VN	12,000	3,600

Mechanical Strength

The low silhouette and simple columnar shape of DynaVar arresters minimize wind resistance. They will withstand winds as high as 120 m.p.h. with a generous safety factor.

The tallest DynaVar VL/VN arrester will also withstand in excess of 0.2 g of earthquake shock. As arrester height decreases at lower voltages, strength improves progressively. Throughout the range of sizes, this exceeds general station requirements.

Cantilever Strength

The high cantilever strengths of DynaVar arresters adequately meet service requirements with generous safety factors for windstorms or earthquakes. Horizontal force can be established by dividing cantilever moment by distance between base mounting and center of force.