The metal oxide surge arrester (MOSA) is a comparatively inexpensive component within a modern power system. Typically, it is specified, purchased and installed but later often overlooked when planning condition monitoring of assets in a substation.
Because of increasing difficulties in securing approvals for new transmission corridors, various new technologies for line uprating have been developed and are now being implemented. The basic idea is to use existing line corridors to transfer more power.
In an HVAC cable, electric field distribution depends on capacitances, which are dominated by permittivity of the insulation material that is stable with temperature. A specified is therefore not required when testing such cables.
Power system engineers all face a similar dilemma at one time or other when trying to identify which product offers the quality they require – especially in today’s global market with its many competing suppliers.
Reliable operation of transmission and distribution systems depends on correct selection of insulators. But proper dimensioning can be a challenge since it requires knowing both site contamination and insulator withstand to specific types of contaminants.
