Station Class Arrestors

ELPRO,s MOGARD Station Class Surge Arresters have been providing excellent protective characteristics, temporary overvoltage capability and switching-surge energy withstand to power systems for over 20 years. It is an improvement on the Field proven Arrester and incorporates the latest development in metal-oxide technology. An outdoor arrester basically consists of a column of highly non-linear metal oxide resistors, which are hermetically enclosed in porcelain containers. The column comprises metal oxide discs connected in series. The improved metal oxide discs have better volt-ampere characteristics & lower power dissipation. The Housing's shed profile has outstanding capability to withstand the effects of very severe external contamination. Since MOGARD Surge Arresters do not have series or shunt gaps, the reliability of the Arrester is enhanced: there is no sparkover protective characteristics, no gap reseal requirement, and no gap failure due to pollution induced coupling currents. Additionally, the response time of the Arrester to overvoltages is extremely fast. At normal system voltage, the Arrester conducts a very small amount of current. When a surge reaches the arrester, it instantaneously conducts the current necessary to limit the overvoltage. As a result, MOGARD Arresters absorb minimum energy to protect equipment insulation. MOGARD Surge Arresters are designed to meet or exceed the requirements of ANSI/IEEE C62.11 and IEC 60099-4 standards.

Arresters of special design can be built to meet specific application requirements. The MOGARD Surge Arrester consists of a stack of Zinc Oxide discs mounted in a sealed porcelain housing. Each disc is wedged by means of a Silicon Rubber, which offers better heat transfer capability and protection against physical damage during transport. This allows for flexibility in transport and storage of Arresters. MOGARD Arrester is filled with dry air at positive pressure, effective and Hermetic Sealing is achieved by using special type of rubber gaskets. This ensures longer life.

Pressure Relief Device is an integral part of the MOGARD Arrester and prevents violent shattering of the Arrester in the event when Arrester has operated. Cutter plates are provided to guide the arc and allow it to follow the predefined path outwards and through the venting ducts.

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