Auxiliary Current Transformers

Function:

Auxiliary current transformers are designed for connection in the secondary circuit of a main current transformer to change the effective ratio on meters or relays.

Auxiliary current transformers are No window type, with many variations of current ratios available depending on model.

What is a Current Transformer?

A Current Transformer (CT) is a type of transformer that is used to reduce or multiply an alternating current (AC). It produces a current in its secondary which is proportional to the current in its primary.

Current Transformers, along with voltage or potential transformers, are instrument transformers. They scale the large values of current to small, standardized values. These values are easy to handle for measuring instruments and protective relays. The Instrument transformers isolate measurement or protection circuits from the high voltage of the primary system.  Furthermore, these units provide a secondary current that is accurately proportional to the current flowing in its primary. They present a negligible load to the primary circuit.

These units are the current sensing units of the power system. They are used at generating stations, electrical substations, and in industrial and commercial electric power distribution.

Advantages:

Advantages of Current Transformers are that the units can measure high current easily. They provide high electrical isolation, simple construction, and easy maintenance and installation.

Background:

The Crompton Instruments product range represents one of the largest product offerings. They focus on power measurement, control, and protection instrumentation for switchgear and generator set manufacturers, panel builders, and OEMs.

Crompton Instruments products offer proven reliability across a diverse array of industries including power generation, process control, test and measurement, utility, marine, defence and energy management applications. We continually review and update our design and manufacturing processes to meet the challenges of ever-decreasing lead times and industry developments.

Features:

• Higher accuracy
• Higher burden capacity
• Higher efficiency
• Insulation Level of 600V, 10kv BIL Full Wave, 50-500 Hz
• No Window Type
• Ratios from 2.5 to 100:5 amps ac

Applications:

• Ammeters
• Cross current compensation
• Relay driver applications
• Watt meters

Approvals:

• CSA
• UL