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Energy & Power Measurement Solutions
Clamp-On Current Transformer. 1" (25Mm) Round Opening.
Clamp-On Current Transformer. 1" (25Mm) Round Opening.
DENT's affordable and compact 150A EZ Clamp current transformers are the one-handed operating solution for temporary or long-term studies. They are designed to work in tight places and clamp around cables or buss bars.
Features
| Key Specifications | |
| Window Size | 25mm (1.0°) |
| Current Range | .5 - 300 A AC |
| Output | 333 mV @ 150 A AC 2.22 mV/A AC ) |
| Accuracy | <1.0 % from .5 A to 300 A AC |
| Phase Shift* | <1° from 5-25 A AC 1° from 25-150A AC <1.5° from 150-300A AC |
| Electrical | |
| Max Output | 666 mV @ 300 A |
| Wire Polarity | Red = Hi, positive (+) Black = Low, negative (-) |
| Phasing | Label On Case Points |
| Orientation | Toward Source |
| Frequency Range | 50 Hz to 400 Hz |
| Mechanical | |
| Case Material | White ABS, UL 94 V-0 |
| Leads | 2.4 M (8'), 600V, 22 gauge |
| Working Temperature | -25 to 70°C (-13° to 158°F) |
| Safety | |
| Working Voltage | 600 VAC, Category III |
| Dielectric Strength | 5200 VAC, 50/60 Hz for 1 minute |
| Certifications | Conforms to: UL STD 61010-1 Certified to: CAN/CSA STD C22.2 No. 61010-1 |
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).
| Key Specifications | |
| Window Size | 25mm (1.0°) |
| Current Range | .5 - 300 A AC |
| Output | 333 mV @ 150 A AC 2.22 mV/A AC ) |
| Accuracy | <1.0 % from .5 A to 300 A AC |
| Phase Shift* | <1° from 5-25 A AC 1° from 25-150A AC <1.5° from 150-300A AC |
| Electrical | |
| Max Output | 666 mV @ 300 A |
| Wire Polarity | Red = Hi, positive (+) Black = Low, negative (-) |
| Phasing | Label On Case Points |
| Orientation | Toward Source |
| Frequency Range | 50 Hz to 400 Hz |
| Mechanical | |
| Case Material | White ABS, UL 94 V-0 |
| Leads | 2.4 M (8'), 600V, 22 gauge |
| Working Temperature | -25 to 70°C (-13° to 158°F) |
| Safety | |
| Working Voltage | 600 VAC, Category III |
| Dielectric Strength | 5200 VAC, 50/60 Hz for 1 minute |
| Certifications | Conforms to: UL STD 61010-1 Certified to: CAN/CSA STD C22.2 No. 61010-1 |
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).
