Isolate the instruments from the power circuits standardise the instruments usually at 5 amps or 1 amp the scale of the instrument according to the ct ratio then becomes the only non standard feature of.
Low voltage current transformer metering.
Instrument transformers are high accuracy class electrical devices used to isolate or transform voltage or current levels.
Along with voltage leads revenue grade current transformers drive the electrical utility s watt hour meter on virtually every building with three phase service and single phase services greater than 200 amperes.
Current transformers play an important role in the monitoring and protection of electrical power systems.
The most common usage of instrument transformers is to operate instruments or metering from high voltage or high current circuits safely isolating secondary control circuity from the high voltages or currents.
These low voltage potential transformers 468 460 2vt469 2vt460 3vtl and 3vtn are generally housed in low voltage switchgears switchboards or motor control centers and provide the necessary voltage signals to the metering device that displays the primary system voltage value for monitoring the condition of the overall electrical system.
Current transformer shapes and sizes vary depending on the end user or switch gear manufacturer.
The importance of instrument transformer tests is often underestimated.
High voltage current transformers are mounted on porcelain or polymer insulators to isolate them from the ground.
Metering current transformers cts are used with the measuring instruments such as ammeters voltmeters kilowatt hour meters etc to.
Ct s are instrument transformers used for converting primary current into a reduced secondary current for use with meters relays control equipment and other instruments.
Eaton s b line series current transformer metering product line includes ct rated meter sockets ct enclosures ct mounting bases combination ct enclosure meter sockets test switches and transockets that are designed to meet customers needs in a variety of applications and are suited for many utility specifications.
This is why it is necessary to match the respective currents and voltages to the values appropriate to connected measuring protection and control.
The portfolio of instrument transformers ranges from low voltage at 600 v suitable for industrial and high accuracy revenue metering all the way up to high voltage at 1 200 kv.
Low voltage single ratio metering current transformers are either a ring type or plastic molded case.
The current transformer c t.
The range of electric values in power supply systems is very extensive.
Current and voltage measurements from 0 6 kv to 48 kv for the protection and monitoring of medium voltage power systems.