Current Transformers Suppliers, UAE

Current transformers (CTs) step down high primary currents to standardized secondary values (typically 1 A or 5 A) for measurement, protection, and metering circuits. They are installed in every switchgear panel and metering cubicle across GCC power networks, making them one of the most frequently procured instrument transformers in the region. Accuracy class, burden rating, and insulation level are the critical selection parameters for procurement managers.

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Current transformers (CTs) are essential instrument transformers that produce a reduced secondary current proportional to the primary current flowing through a power circuit. They enable accurate metering, protection relay operation, and power quality monitoring without exposing instruments to dangerous high-current conductors.

CTs are classified by application: metering CTs require high accuracy at rated current (class 0.2 or 0.5 per IEC 61869-2) while protection CTs must maintain accuracy during fault conditions (class 5P or 10P with specified accuracy limit factors). GCC utilities such as DEWA and SEC mandate specific CT accuracy classes for revenue metering, typically class 0.2S for billing-grade installations.

Available in wound, bar-primary, and window (ring) types, CTs are specified by primary current, secondary current (1 A or 5 A), rated burden (in VA), accuracy class, and insulation voltage level. For medium-voltage switchgear applications in the Gulf, CTs are typically rated for 12 kV or 36 kV system voltage with BIL (basic insulation level) appropriate to the network.

Procurement managers should ensure CTs are ordered in matched sets for three-phase circuits to maintain measurement balance. Specify extended creepage distance for outdoor CTs in coastal GCC locations where salt-laden humidity accelerates insulation degradation. Request routine test certificates per IEC 61869-2 with each batch, and consider requesting special tests (including temperature rise and short-time current withstand) for critical metering and protection applications.

Frequently Asked Questions — Current Transformers

What accuracy class should we specify for revenue metering CTs in the GCC?

DEWA, ADDC, and SEC typically require class 0.2S current transformers for revenue metering at medium and high voltage levels. Class 0.5S may be acceptable for low-voltage billing meters. Always confirm the specific requirement with the utility authority and the meter manufacturer to ensure compatibility.

How do we determine the correct CT ratio for a switchgear panel?

Select a CT ratio where the normal operating current falls between 50 and 120 percent of the CT primary rating. For example, if a feeder normally carries 350 A, a 400/5 A CT is appropriate. Avoid oversizing, as metering accuracy degrades significantly when the measured current falls below 10 percent of the CT primary rating.

What is the difference between 1 A and 5 A secondary CTs?

Five-ampere secondary CTs are standard for short cable runs (under 15 meters) between the CT and the connected instrument. One-ampere secondary CTs are preferred when cable distances exceed 15 meters, as the lower current reduces voltage drop and burden on the CT, maintaining accuracy in large switchrooms and substations typical of GCC industrial plants.