CA01082E_Catalog 30

Overview

Equipment Protection is Job One – Next to your people, your power grid infrastructure is your largest and most valuable investment. Protect it with Hubbell Power Systems (HPS) surge arresters. Every lightning strike, insulator flashover and switching

surge adds wear and tear to your equipment, prematurely aging it, and requiring you to shoulder the costs of replacement. Even the smallest surge can shorten your equipment’s life. Surge arresters, however, extend the life of your system by limiting the voltage across your equipment during a surge event. How Arresters Work – Arresters, when placed in substations or on transmission or distribution lines, protect connected equipment against all types of voltage surges. Appearing as a very high impedance at normal operating voltages, the arrester rapidly transitions to a very low impedance on the arrival of a high voltage surge resulting from lightning or switching activity. The arrester, typically connected from line-to ground across the equipment to be protected, then provides a by-pass route for surge current and, at the same time, clamps the line-to-ground voltage to a level well below the insulation withstand level (BIL or BSL) of the equipment. Once the surge has passed, the arrester returns to its original state, and the system survives the event without disruption. Advancing Arrester Technology – The Ohio Brass Company, now fully integrated into Hubbell Power Systems, began the manufacture of surge arresters in 1950. The company had been, and continues to be, a major manufacturer of high voltage insulators, using the knowledge and experience gained in that long history to improve and innovate the arrester product lines, first with its own production of porcelain housings, later with the development of polymer materials for high voltage insulation that are now used for the latest technology polymer-housed arresters. Separately from the insulating materials development, the company was among the very early pioneers in metal oxide varistor (MOV) technology, which is at the heart of all modern surge arresters. It is the MOV that provides the non-linear resistance characteristic that gives the arrester the voltage limiting and current by-pass characteristics mentioned above. Over the years, HPS has made great strides in MOV technology, improving energy handling capability and providing better voltage clamping, allowing us to continue providing our customers with “best of class” surge protection, accompanied by “best in class” customer service. Our High Quality MOV Discs and Polymer Housings – We opened our MOV disc plant in 1977 to control the most critical components of our surge arresters. This long history with MOV technology ensures that the MOV discs used in HPS arresters will always meet our exacting standards. Our proprietary ESP TM weathershed material, made of a blend of silicone and EPDM, resists tracking and provides exceptional leakage distance. It has proven its mettle in some of the toughest weather conditions for the past decades. We perform extensive testing on all of our products to ensure that all of our arresters meet or exceed industry standards. These features protect your lines, your linemen and your bottom line.

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