Power factor tests compare the capacitive current to the resistive current used by a piece of equipment. If the capacitive current becomes large in relation to the resistive current, it indicates a potential problem with the insulation. Insulation breakdown often leads to equipment breakdown.
Protec Equipment Resources offers many power factor test sets for rent. These units apply voltage to the conductors while measuring losses to ground. By comparing the results to historical results, abnormal conditions can be easily identified. Further tests can help determine exactly where the problem exists.
While power factor testing usually involves transformers and breakers, tests can be useful on other types of equipment such as switches, motors and voltage regulators.
Current transformers are used for relaying and metering purposes in electrical power systems. They connect the high power primary side to the protection and metering equipment on the secondary side. Depending on the application they are used for, current transformers are designed differently.
The Omicron CPC 100 Multi-functional Primary Test System allows the verification of the ratio and polarity of CTs and VTs – preventing wrong connections, especially in the case of tapped CTs. Injecting current or voltage into individual CTs / VTs and checking the reading at the relay ensures that phases are not mixed up and that the CT and VT ratio setting in the relay is correct.