Instrument transformers mitsubishi electric corporation. The turn ratio of the given instrument transformer is 1. It might appear that the extension of range could be conveniently done by the use of shunts for currents and multiplier for voltage measurement, as in dc. Instrument transformers will operate successfully under many atmospheric conditions and transients, and switching overvoltages. Instrument transformers application guide abb group. The name instrument transformer is a general classification applied to current and. Tpu current trans formers are suitable for the current air insulated. In reality, however, it is not possible to neglect the excitation. Instrument transformers for indoor applications product. Install the ct as specified in the installation manual supplied. A current transformer so arranged that it acts as a support for the conductor in the primary circuit. Instrument transformer basic technical information and. Oilinsulated current transformer are used to convert high transmission line currents up to 5000 a.
Instrument transformers will transmit the signal to the metering and protective relaying instrumentation, with the purpose of protection of important equipment. Typical output levels of instrument transformers are 15 amperes and 115120 volts for cts and vts, respectively. Basics, maintenance, and diagnostics vii contents continued page 4. Abb instrument transformers current transformer theory technical level training course 201203. There are several classes of accuracy for instrument transformers. Pdf abb instrument transformers current transformer.
Indoor instrument transformers schneider electric belgie. A current transformer is designed to convert the primary rated current which flows through the primary winding. Instrument transformer in power system, the currents and voltages are very large therefore, their direct measurements are not possible. Medium voltage instrument transformers ritz instrument. A current transformer ct is a type of transformer that is used to reduce or multiply an. The reliability and security of trench oilinsulated instrument transformers is based on 100. Instrument transformers are the most common and economic way to detect a disturbance.
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