Hubbell Power Systems

Automation-Ready Distribution Switches

Application flexibility
for today... tomorrow ... the 2000's

The future of overhead distribution systems is one of change. Among the realities: Ever greater load densities (more load per mile of line), more interconnections, more laterals and branches. And, in the new competitive environment, a continuing demand for higher degrees of system reliability. Along with this, the continuing expansion of Distribution Automation.

Utility engineers must be confident that the products being installed now will meet the needs of their future distribution systems.

The Hubbell AR Switch was designed with these factors in mind. It's a switch to meet today's needs, and those of the known, anticipated future of your distribution system, including the growth of Distribution Automation.

First the basics: The AR Switch is available for 14.4kV, 25kV and 34.5kV (grounded wye) systems. And in four mounting configurations: Horizontal, vertical, phase-over-phase and delta, to meet a variety of distribution feeder line configurations. All AR Switches are fully rated for 900 ampere continuous current and 900 ampere interrupting current, a definite benefit as distribution system load densities increase.

AR Switches have a one-time and three-time duty cycle fault-closing capability of 25,000 amperes rms asymmetrical and 20,000 amperes rms asymmetrical, respectively. This again is a substantial benefit for increasing distribution system load densities, and as distribution feeders are automated in the future.

For switches installed in icy weather conditions, AR Switch mechanical and electrical operation is ensured, even with ice buildup of up to 3/4 inch without any additional ice shielding devices, the highest level in the industry.

The AR Swtich can be purchased as a standard switch and upgraded for Distribution Automation in the future, or ordered as a complete automated switch today. Bracket extensions are available for mounting line sensors (sensors can be provided as specified by the user) as is the Chance Motor Operator, with or without an RTU and communication package.

The Chance Motor Operator is available in rotating and reciprocating models. It can be provided with a mounting panel for an RTU and communication package or complete with the user-specified RTU/communication package, fully installed and tested. For more information, refer to Chance catalog section 14C.

Installation simplicity and ease of operation
Until now, the most time consuming aspect of gang operated switch installation has been the installation and adjustment of control pipe. Once the switch and control pipe were installed, adjustments had to be made to ensure proper blade opening and closing. Typically, a certain amount of "wrap-up" had to be set in the operating handle/lock segment. Periodic inspection was recommended to see that the switch had not lost its adjustment due to such factors as pole twist. The AR Switch is preassembled and factory adjusted to simplify field installation. Key to this is the AR Switch's unique overtoggle operating mechanism which is factory preset. This Four-Link Overtoggle Mechanism reduces installation time by eliminating any need to adjust the control assembly. No "wrap-up" is required. During operation, the AR's overtoggle mechanism gives the operator a "snap" feedback, positive assurance of blade closing. And it delivers a significant mechanical advantage - the lowest force required in the industry to open and close a switch of this kind (no more than 50 ft.- lb. for a torsional operating switch). In addition, the AR overtoggle mechanism greatly reduces the possibility of an AR Switch coming out of adjustment due to pole twist.
	Above and at right, Hook Stick Control option opening and closing switch.
The AR Switch provides for the fastest and easiest installation possible. Installation time can be reduced even further with the Hook Stick Operation feature which eliminates down-the-pole controls.

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Hubbell Power Systems, Inc. • 210 North Allen St. • Centralia, MO • 65240-1395
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Last updated: August 13, 2008