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Arresters

PPC Insulators

Arrester Housing Design & Application

Arrester housings are insulators but have properties and design parameters that are not common to insulators. While a composite insulator is made primarily of polymer rubber on the outside and a fiberglass rod or tube on the inside, polymer-housed arresters... Read More

Optimizing Specification of Non-Gapped Line Arresters

In spite of a range of remedial measures, lightning remains one of the leading causes of line tripping disturbances. Therefore, solutions to lessen its impact remain a priority for line designers and power system operators across the globe. Installation of... Read More

Condition Assessment of Substation Surge Arresters

The metal oxide surge arrester (MOSA) is a comparatively inexpensive component within a modern power system. Typically, it is specified, purchased and installed – but then overlooked when planning condition monitoring of assets at a substation. However, an... Read More

Fault Current Withstand Capability

There are two types of fault currents that can appear on power systems: ground and phase-to-phase. More important with regard to arresters is the former, which is basically the current that flows through the circuit when there is a short to ground. The... Read More

Importance of Line Entrance Arresters

At most air-insulated substations, the arrester mounted at the transformer is close enough to other equipment to provide effective protection from flashover. However this applies only if the breakers are closed. If a breaker is open, the insulators on its... Read More

Figure 6: Non-gapped line arrester (NGLA). CLICK TO ENLARGE

Arrester Lead Design & Application

Once a decision is made to install a surge arrester of a particular type, design details when it comes to ideal mounting arrangement and how to deal with various line and earth lead issues can prove a challenge. These details can be made the more complex... Read More

Interaction of Line Surge Arresters with Vibration Dampers

Transmission line surge arresters (TLSAs) have become an important design and mitigation alternative to improve grounding and reduce investment in overhead ground wire. However, they have also been known to experience a number of mechanical problems in... Read More