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FLEXIBLE COILS
Rocoil 1000 Series
The Rocoil® Type 1000 flexible Rogowski coils are available in a range of lengths and cross-sectional diameters as well as in screened and un-screened versions. With a suitable electronic integrator these coils can be used to measure low currents with a resolution as low as 1mA and high currents of greater than 1MA. The Rogowski coil sensors provide complete isolation from the circuit being measured and have no effect on the current being measured even for very low-impedance circuits.
1000 Series Features
There are other devices that measure electric current without making electrical contact with the conductor. Many of these, including the conventional current transformer, use a ferromagnetic core and are subject to magnetic saturation effects that limit the range of currents that they can measure. A Rogowski coil, on the other hand, is ‘linear’; it does not saturate and the mutual inductance between the coil and the conductor is independent of the current. Many of the useful features of Rogowski coil systems result from their linearity.
- They have a wide dynamic range so that the same coil can be used to measure both very small and very large currents
- Calibration is easier because the coil may be calibrated at any convenient current level and the calibration will be accurate for all currents including very large ones
- Coils can be built which are very compact and can be fitted in confined spaces. They are thus very useful for retro-fit applications
Product Options
/PUSH Push-together ends
/SCR Screw-together ends
/HIGH Higher output version (1012, 1022 coils only)
The coil specification must include the length of the coil and the length of the output cable.
Coil types are specified by a 4 - digit code:
1st : 1 - butted together ends with internal compensation coil
2nd : 0 - no screen, 1 - braid screen, 2 - foil screen
3rd : 1 - standard cross-section, 2 - small cross-section, 3 - low output
4th : 0 - no insulation, 1 - single layer of insulation, 2 - double insulation
| Coil Type | Screen | Diameter of coil body mm | Approx. mutual inductance (H) | Typical output (1kA at 50Hz) | Typical output (1kA at 60Hz) | frequency -3dB 500mm coil |
|---|---|---|---|---|---|---|
| 1012 |  |
10.5 | 0.211* | 66.3mV | 79.6mV | 450kHz |
| 1112 | |
12.0 | 0.211* | 66.3mV | 79.6mV | 300kHz |
| 1022 | |
6.0 | 0.111 | 34.9mV | 41.9mV | 360kHz |
| 1122 | |
7.0 | 0.111 | 34.9mV | 41.9mV | 300kHz |
| 1232 | |
|
0.023 | 7.2mV | 8.7mV | 2.0MHz |
*A higher output version is available with a mutual inductance of 0.332 (104mV for 1kA/50Hz, 125mV for 1kA/60Hz).
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