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Power plants and substations are the major components of the energy system aside from power transformers the main parts of such a plan include instrument transformers the protection and control system as well as switching elements like circuit breakers and disconnectors for a reliable supply of electricity the correct operation of all individual components and their seamless interaction has to be assured during the entire life cycle of the plant commissioning tests are performed to verify manufacturing data identify and fix possible transportation damages and confirm correct wiring in refurbishment projects the parts of the system with a shorter life span are renewed while other components remain in service the performance of the remaining apparatus has to be verified and the proper interaction of old and new components needs to be confirmed during a stations operational lifetime measurements are performed as part of periodic maintenance activities as well as for troubleshooting the testing of individual components is based on their respective functions current transformers or CTS have to transform the primary current to a secondary current needed for control protection and metering systems the secondary current must be accurate and amplitude polarity and phase in order to allow accurate metering and proper operation of the protection system protection CTS must be capable of driving high fault currents to the protection system without saturation and vice versa metering CTS must provide accuracy within the range of operational currents and saturates slightly above that range in order to protect the energy meters thus testing of CTS normally includes verifying the ratio and phase displacement testing the polarity measuring the magnetization curve and knee point measuring the winding resistance and secondary burden and calculating the accuracy limiting factor for protection CTS or the instrument security factor for metering CTS it also includes the D magnetization of the CT after testing potential or voltage transformers or ITS have to transform primary voltages into levels that can be applied to control protection and metering systems with sufficient accuracy and correct polarity thus during the commissioning or refurbishment of a substation testing a VT includes checking its ratio and polarity and measuring its burden circuit breakers disconnectors and other connections in the primary circuit must have good contacts in order to allow operational currents to flow with minimal losses contact resistance measurements are performed to ensure tight connections or to identify and eliminate corrosion all of these substation components breakers CTS and V T's are connected to the protection and control system the connections from the CTS and VT s and their individual cores to meters automation units and protection relays must be correct as well as those running from the trip circuits to the circuit breakers thus after testing the individual components...
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