Variant in Current Transformer: Wound Primary CT
A control transformer is a transformer that is used to step down the voltage to power the control devices of a circuit or machine. The reduced voltage provides a much safer environment for technicians working on the equipment. Residential heating, ventilating, air conditioning systems, and other machines use reduced voltage for the controls, thermostats, relays, and contactors.
Control transformers are often referred to as power supplies. Control transformers with two primary coils and one secondary coil are the most common. A control transformer's primary coils are crossed so that metal links can be used to connect the primaries for 240 V or 480 V operation.
A wound type CT has one or more turns of insulated copper wire wound as the primary winding, which provides higher accuracy at low primary currents (typically below 100A). A bar type CT uses a solid bus bar as the single-turn primary, making it suitable for higher current ratings but less precise at low current levels. For electrical panels requiring accurate metering at currents under 100A, wound type CTs are the preferred choice.
Powertrac Meters wound type CTs are available in metering accuracy classes 0.1, 0.2, 0.5, 1.0, and 3.0, as well as protection classes 5P and 10P — suitable for energy meters, multifunction meters, protection relays, and control devices.
Powertrac wound type CTs are rated for a maximum system voltage of 720V, making them suitable for all standard LT (Low Tension) electrical panel applications.
Yes. All Powertrac Meters wound primary CTs comply with IS 2705 Part 1 and IEC 60044-1 and are tested on an automatic CT test system to ensure class accuracy before dispatch.
To select the correct wound type CT, identify your primary current (load current), required secondary current (1A or 5A), accuracy class (based on meter type), burden (VA), and busbar dimensions. Contact Powertrac Meters Pvt Ltd at +91-93144-72389 or sales@powertracindia.com for a customised recommendation.
| Feature | Value |
|---|---|
| Input Specifications | |
| Current Rating | 1 A to 4000 A |
| Rated Sec . Current | 5A or 1 A or as required |
| Test Voltage | 3 KVeff , 50 Hz 1 min / as applicable |
| System Voltage | 720 V max |
| Outer Insulation | Resin / Non - flammable Plastic / Tape (PVC or Fiber Glass) |
| Protection Class | IP 65 ( Resin ) / Ip20 |
| Thermal Short Circuit Current ( Ith ) | 60 X In |
| Rated Continuous Thermal Current ( CTC ) | 1.2 In |
Note: Technical Specifications and illustrations are subject to change arising out of continuous Product Development.
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