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Energy & Power Measurement Solutions
Rocoil flexible current transformer measuring 72" with a nominal rating of 5000 amps (Depending on meter compatibility).
Rocoil flexible current transformer measuring 72" with a nominal rating of 5000 amps (Depending on meter compatibility).
Discontinued!
This product has been discontinued and is no longer available.
This is the direct replacement:
The DENT RoCoil™ Current Transformers have been designed for accurate non-intrusive measurement of AC current, pulsed DC or distorted waveforms. This type of sensor may be used to measure AC current over a wide dynamic range and from 40Hz to 5 kHz.
Note: The RoCoil™ may require use of integrator/amplier.
| Window Size | 72": 56.0cm (22.0") |
| Output Signal (di/dt) | 131 mV / 1000A @ 60Hz 109.2 mV / 1000A @ 50Hz |
| Current Range | PS3037: 5-4000 Amps EXC/PD24: 5-5000 Amps |
| Nominal Rating | 131mV / 1000A@ 60Hz 110mV / 1000A@ 50Hz |
| Wire Colors | 5000 Amps |
| Accuracy | < 1% |
| Phase Shift | < 1° at 50/60Hz |
| Frequency Range | 40Hz to 5 kHz |
| Dielectric Strength | 7400 VAC around coil 1000 VAC rated leads |
| Polarity | White lead is positive |
| Output Lead | 2 m (79") shielded cable |
| Operating Temperature | -4° to 176°F (-20° to 80°C) |
| Storage Temperature | Maximum 176°F (80°C) |
| Case Protection | Polypropylene UL 94 V-0 rated |
| Working Voltage | Maximum 1000 Vrms, Category III |
| Requirements | Conforms to UL STD 61010-1 Certified to CAN/CSA STD C22.2 No. 61010 |
One of the most frequently asked questions in our tech support department is this: "Can I get CTs with longer leads or extend the leads myself? What's the maximum length for CT leads?".
Standard lead length for a DENT current transformer is 3 meters (with a 7 meter option available for some models). Occasionally, because of electrical room layout or other factors, there is a requirement for longer leads on a current transformer. Therefore, extending the CT leads is necessary. The following is a brief overview of options for extending CT leads based on CT type. Note that the length recommendations listed below apply to PowerScout Series and ELITEpro XC instruments ONLY. To extend RoCoil leads for use with the TCA-5, please contact our experts to get advice specific to your application.
Split-Core Current Transformers leads can be extended up to 500 feet using extensions of the same wire type/AWG.
600 V Rated VW-1, 105°C, 20 AWG, black and white twisted pair, cURus
Sure-Connect sealed butt splices which require a crimping tool and hot air gun. Always follow manufacturer's instructions.
RoCoil CT leads can be extended up to 100 feet using extensions of the same wire type/AWG.
"Bare" RoCoil: Shielded cable with thermoplastic insulation, 1000 V AC VW-1, 2 x 26 AWG, 80°C, cURus
Sure-Connect sealed butt splices which require a crimping tool and hot air gun. Always follow manufacturer's instructions.
Solid Core (Toroid) CT leads can be extended up to 500 feet using extensions of the same wire type/AWG.
UL1015 24 AWG 7 Strand Black & White Twisted Pair (1 twist per inch), 600 V rated
Sure-Connect sealed butt splices which require a crimping tool and hot air gun. Always follow manufacturer's instructions.
Rogowski coil, named after Walter Rogowski, is an electrical device for measuring alternating current (AC) or high-speed current pulses. It consists of a helical coil of wire with the lead from one end returning through the center of the coil to the other end so that both terminals are at the same end of the coil. The whole assembly is then wrapped around the straight conductor whose current is to be measured.
Since the voltage that is induced in the coil is proportional to the rate of change of current in the straight conductor the output of the Rogowski coil is usually connected to an electrical (or electronic) integrator circuit in order to provide an output signal that is proportional to the current.
The relationship between voltage and rate of change of current is explained in the following equation where "V" is voltage and "M" is a constant:
Rogowski coil accuracy is usually calibrated with the conductor centered in the CT window. In practice, however, the CT typically hangs on the conductor which can introduce measurement errors. Note that the error is greatest when the CT connector hangs on the conductor. The following diagram outlines the error introduced simply by moving the conductor to different positions within the opening of the Rogowski coil.
Best practice for Rogowski coil installation is to center the conductor as best as conditions allow. In addition, it's a good idea to keep any other conductors (those you do not wish to measure) at a minimum distance of 2x the diameter of the Rogowski coil CT.
Also, keep in mind that although a Rogowski coil is ideal for large amperage loads, accuracy of the coil may be reduced on smaller loads (<20 A).
| Window Size | 72": 56.0cm (22.0") |
| Output Signal (di/dt) | 131 mV / 1000A @ 60Hz 109.2 mV / 1000A @ 50Hz |
| Current Range | PS3037: 5-4000 Amps EXC/PD24: 5-5000 Amps |
| Nominal Rating | 131mV / 1000A@ 60Hz 110mV / 1000A@ 50Hz |
| Wire Colors | 5000 Amps |
| Accuracy | < 1% |
| Phase Shift | < 1° at 50/60Hz |
| Frequency Range | 40Hz to 5 kHz |
| Dielectric Strength | 7400 VAC around coil 1000 VAC rated leads |
| Polarity | White lead is positive |
| Output Lead | 2 m (79") shielded cable |
| Operating Temperature | -4° to 176°F (-20° to 80°C) |
| Storage Temperature | Maximum 176°F (80°C) |
| Case Protection | Polypropylene UL 94 V-0 rated |
| Working Voltage | Maximum 1000 Vrms, Category III |
| Requirements | Conforms to UL STD 61010-1 Certified to CAN/CSA STD C22.2 No. 61010 |
One of the most frequently asked questions in our tech support department is this: "Can I get CTs with longer leads or extend the leads myself? What's the maximum length for CT leads?".
Standard lead length for a DENT current transformer is 3 meters (with a 7 meter option available for some models). Occasionally, because of electrical room layout or other factors, there is a requirement for longer leads on a current transformer. Therefore, extending the CT leads is necessary. The following is a brief overview of options for extending CT leads based on CT type. Note that the length recommendations listed below apply to PowerScout Series and ELITEpro XC instruments ONLY. To extend RoCoil leads for use with the TCA-5, please contact our experts to get advice specific to your application.
Split-Core Current Transformers leads can be extended up to 500 feet using extensions of the same wire type/AWG.
600 V Rated VW-1, 105°C, 20 AWG, black and white twisted pair, cURus
Sure-Connect sealed butt splices which require a crimping tool and hot air gun. Always follow manufacturer's instructions.
RoCoil CT leads can be extended up to 100 feet using extensions of the same wire type/AWG.
"Bare" RoCoil: Shielded cable with thermoplastic insulation, 1000 V AC VW-1, 2 x 26 AWG, 80°C, cURus
Sure-Connect sealed butt splices which require a crimping tool and hot air gun. Always follow manufacturer's instructions.
Solid Core (Toroid) CT leads can be extended up to 500 feet using extensions of the same wire type/AWG.
UL1015 24 AWG 7 Strand Black & White Twisted Pair (1 twist per inch), 600 V rated
Sure-Connect sealed butt splices which require a crimping tool and hot air gun. Always follow manufacturer's instructions.
Rogowski coil, named after Walter Rogowski, is an electrical device for measuring alternating current (AC) or high-speed current pulses. It consists of a helical coil of wire with the lead from one end returning through the center of the coil to the other end so that both terminals are at the same end of the coil. The whole assembly is then wrapped around the straight conductor whose current is to be measured.
Since the voltage that is induced in the coil is proportional to the rate of change of current in the straight conductor the output of the Rogowski coil is usually connected to an electrical (or electronic) integrator circuit in order to provide an output signal that is proportional to the current.
The relationship between voltage and rate of change of current is explained in the following equation where "V" is voltage and "M" is a constant:
Rogowski coil accuracy is usually calibrated with the conductor centered in the CT window. In practice, however, the CT typically hangs on the conductor which can introduce measurement errors. Note that the error is greatest when the CT connector hangs on the conductor. The following diagram outlines the error introduced simply by moving the conductor to different positions within the opening of the Rogowski coil.
Best practice for Rogowski coil installation is to center the conductor as best as conditions allow. In addition, it's a good idea to keep any other conductors (those you do not wish to measure) at a minimum distance of 2x the diameter of the Rogowski coil CT.
Also, keep in mind that although a Rogowski coil is ideal for large amperage loads, accuracy of the coil may be reduced on smaller loads (<20 A).
