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Rogowski Coil CT Amplifier | RoCoil TCA-5 Kit

RoCoil TCA-5 High Voltage Kit
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RoCoil TCA-5 High Voltage Kit RoCoil TCA-5 Low Voltage Kit RoCoil TCA-5 Setup Diagram

Since pioneering the use of flexible RoCoil CTs in energy measurement, we have been asked to provide a flexible Rogowski coil sensor with a 5 amp output. We are pleased to announce that the RoCoil TCA-5 now fulfills this requirement in the marketplace. Those who use 5 amp current input power meters will now be able to take advantage of the easy installation and broad current range coverage offered by RoCoil flexible current transformers.

The RoCoil TCA-5 is a three-channel integrating transconductance amplifier (TCA) that converts the 131mV/1000A electrical output signal from the RoCoil current sensor to a 5 amp AC current, emulating a traditional current sensing transformer.

The RoCoil TCA-5 is factory-calibrated to work with DENT RoCoil CTs (131mV/1000A). The unit can be DIN or panel mounted and a 10" section of TS35/7 DIN rail is included with the kit.

The flexible RoCoil current transformers are sold separately. The TCA-5 is available in a high voltage version for 400/500VAC 3-phase services (line-to-line) or a low voltage version for 120/240VAC 1-phase services and 208V 3-phase. Specify which power supply is needed when ordering (HV = High Voltage, LV = Low Voltage).

Parts: TCA-5-HV-KIT, TCA-5-LV-KIT

  • The RoCoil TCA-5 has been factory-calibrated for use with DENT RoCoil CTs
  • Output current is between 0-5.00 Amps (RMS)
  • Available RoCoil sensing ranges are 500, 1000, 2500, and 5000 Amps (selectable)
  • Use on three-phase or single-phase systems
  • Choice of two 48VDC power supplies: Low voltage 120/240VAC or 400/500VAC
  • 50/60 Hz
  • Accuracy: 1%. Consult data sheet for details.
  • cULus Listed (must be used with DENT Instruments' supplied Power Supply to maintain UL Listing)
  • CE Mark
  • One Year Warranty

AC/DC 48V Power Supply

The RoCoil TCA-5 requires an external 48 VDC power supply for operation. Two versions of the power supply are available: a 120/240VAC "low voltage" version and a 400/500VAC "high voltage" version. The power supply is provided as part of the RoCoil TCA-5 kit or may be ordered separately.

Selectable Current Ranges and Frequency

The RoCoil TCA-5 has four selectable current ranges: 500, 1000, 2500, and 5000A. The range is changed using a switch on the front of the device. See Current Ranges table (left) for current range information.

A separate switch on the front is used to change the frequency between 50 and 60 Hz.

Output Impedance/Burden

The wire that connects the RoCoil TCA-5 to the power meter is supplied by the user. Linearity and precision are maintained by using the correct output wire size.

The maximum allowable output impedance (or burden) of 50 m-ohm plays a critical role in the selection of output wire size and the allowable distance between the power meter and the RoCoil TCA-5. The Output Impedance/Burden Table (left) has been generated assuming that the meter burden is 5 m-ohms leaving 45 m-ohms for the wire. Note that the meter distance is half the wire length.

The voltage drop allowed by the output circuitry (i.e., the voltage drop due to current flowing through the sum of the wire resistance and meter burden) is 250 mV RMS or 1.25 VA.

Installation

The RoCoil TCA-5 is intended to be wall mounted with the output terminals facing up. Three RoCoil current sensors will typically be installed inside the service panel at the feeder or around the branch circuit of interest. The RoCoil TCA-5 can be mounted as a panel unit using slide-out tabs on the back or mounted on a 35 mm width DIN Data Sheetrail (a 10" section of DIN rail is included when ordered as a kit from DENT Instruments). 

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Technical Documents

Explore our Resources to learn in-depth information about how DENT products are used around the world for energy auditing, power submetering, and time-of-use applications. Watch a video to learn more about DENT power meters and loggers. Interact with us on the DENT Blog and explore current topics, unique applications, and technical information.

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