Instrument transformer

Instrument transformers are high accuracy class electrical devices used to isolate or transform voltage or current levels. The most common usage of instrument transformers is to operate instruments or metering from high voltage or high current circuits, safely isolating secondary control circuitry from the high voltages or . Electrical instrument transformers transform high currents and voltages to standardized low and easily measurable values that are isolated from the high voltage. When used for metering purposes, instrument transformers provide voltage or current signals that are very accurate representations of the.

Transformers used to feed measuring instruments , electricity meters, protection relays and similar equipment.

In modern substation current and voltage transformers can be replaced by sensors.

Which reduces the electrical insulation requirement for measuring instruments and protective circuits and also assures the safety of operators.

Several measuring instruments can be connected through a . The original magnitude can be determined by just multiplying the result with the transformation ratio. Such specially constructed transformers . Indoor voltage transformers - Insulation level from up to 40. Transformers can be equipped with fuse, introduced in the primary winding, or without fuse.

PVA transformers are top core type CT design with an inductive voltage transformer housed in the base. Top core current design makes it possible to achieve high values of thermal and dynamic . The combined instrument transformer offers the station designer the ability of being able to accommodate the current transformer and the voltage transformer in one free-standing unit. Current Transformers (CT) are used for current metering and protection in high voltage network systems. This allows optimum use of substation space while yielding cost savings by elimination of.

It is not intended to make the reader an instrument transformer designer. Instrument Transformers for high accuracy metering, protection, and station power applications. Our products are in operation at electric utilities and large . All products are designed to the highest standards for high accuracy revenue metering and protection applications and. The innovative COSI (COmpact Sensor Intelligence) range of digital instrument transformers is designed to be . A transformer that transfers primary current, voltage, or phase values to the secondary circuit with sufficient accuracy to permit connecting an instrument.

Substation in Sweden with cold climate. Voltage units are available for line-to-line applications, designated by Y, and for line-to-ground applications, designated by GY. Current, voltage and combined transformers, oil-paper or gas insulated up to 8kV. Sensors based on alternative principles have been introduced as successors to conventional instrument transformers in order .