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Flexible clip-around Rogowski coil current sensor
| Operating Temperature Range | −40 ... 80 °C |
| Isolation Test Voltage | 7.4 kV |
| Frequency Bandwidth | 420 kHz |
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 7.4 kV |
| Impulse Withstand Voltage (1.2/50 µs) UNi | 12.8 kV |
| Comparative Tracking Index (CTI) | 600 |
Secondary distribution substations, Distribution transformer monitoring, Phasor Measurement Units (PMU), Commercial and industrial buildings, Metering and sub-metering, Demand response (DR), Distribution system equipment.
The ART-B22-D125/SP25 3m, SMA is a flexible clip-around Rogowski coil current sensor from LEM for the electronic measurement of AC current, with galvanic isolation, delivering an instantaneous output voltage of 22.5 mV/kA @ 50 Hz, IP = 1 kA.
Since it cannot saturate, very high and short-circuit currents are measured without degradation. Typical applications include Secondary distribution substations, Distribution transformer monitoring, Phasor Measurement Units (PMU) and Commercial and industrial buildings.
Key characteristics from the official datasheet: frequency bandwidth 420 kHz; operating temperature −40 ... 80 °C.
| General Information | |
|---|---|
| Manufacturer | LEM |
| Product Series | ART |
| Product Reference | ART-B22-D125/SP25 3m, SMA |
| Primary Nominal Current | Any current (no saturation) |
| Measurement | AC current (flexible Rogowski coil) |
| Sensing Aperture | ⌀ 125 mm |
| Application Domains | Industrial · Smart Grid |
| Electrical Data — ART-B22-D125/SP25 3m, SMA (TA = 25 °C, RL = 10 kΩ) | |
|---|---|
| Primary Nominal Current (IPr) | Not applicable (no saturation) |
| Rated Short-time Thermal Current (Ith) | 300 kA @ 50 Hz |
| Rated Transformation Ratio (kr) | 44.44 kA/V @ 50 Hz |
| Rated Frequency (fr) | 50/60 Hz |
| Secondary Voltage (US) | 22.5 mV/kA @ 50 Hz, IP = 1 kA |
| Mutual Inductance (M) | 71.98 nH |
| Temperature Coefficient of M (TCM) | ±30 ppm/K |
| Frequency Bandwidth (BW, −3 dB) | 420 kHz (cable length 3 m) |
| Phase Displacement (Δφ) @ 50/60 Hz | 0.004 ° |
| Coil Inductance (LS) | 258 µH |
| Coil Resistance (RS) | 81 Ω |
| Ratio Error (ε, centered) | −0.5 … +0.5 % |
| Ratio Error (ε, all positions) | −0.75 … +0.75 % (including positioning error) |
| Linearity Error (εL) | None |
| Error due to External Magnetic Field (εI ext) | 0 ±0.2 ±0.4 % |
| Absolute Maximum Ratings | |
|---|---|
| Maximum Secondary Voltage US max | 30 V |
| Maximum Primary Conductor Temperature TB max | 105 °C |
| Insulation Coordination | |
|---|---|
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 7.4 kV |
| Impulse Withstand Voltage (1.2/50 µs) UNi | 12.8 kV |
| Partial Discharge RMS Test Voltage (q < 10 pC) Ut | 1.65 kV |
| Clearance (pri. – sec.) dCI | > 16 mm |
| Creepage Distance (pri. – sec.) dCp | > 16 mm |
| Case Material | V0 (according to UL 94) |
| Comparative Tracking Index CTI | 600 |
| Rated Insulation Voltage (UL 61010-1) | AC 1000 V, 50/60 Hz, CAT III, 2000 A |
| Overvoltage Category / Pollution Degree | CAT IV, PD2 (reinforced) · CAT III, PD2 (basic) |
| Environmental & Mechanical Characteristics | |
|---|---|
| Ambient Operating Temperature TA | −40 … +80 °C |
| Ambient Storage Temperature TA st | −40 … +80 °C |
| Relative Humidity (non-condensing) RH | 0 … 90 % |
| Altitude above Sea Level | 2000 m |
| Protection Degree | IP57 |
| Mass (⌀ 125 mm) | 200 g (cable length 3 m) |
| Output Cable Length | 3 m |
| Termination | 2 stripped wires |
| General Tolerance | ±1 mm |
| Standards & Certifications | |
|---|---|
| IEC 61010-1 | 2010 |
| IEC 61010-2-32 | 2012 |
| IEC 61869-10 | 2017 – Class 0.5 accuracy |
| UL 61010-1 | 2012 (Third Edition), File # E330077, Vol. D1 |
| CAN/CSA-C22.2 No. 61010-1-12 | 3rd Edition (revision 2016) |
Note: Specifications are taken from the official ART-B22-D125/SP25 3m, SMA datasheet. Parameters that could not be confirmed from the datasheet are marked UNVERIFIED.
Official technical documentation for the ART-B22-D125/SP25 3m, SMA.
Outline dimensions, pin layout and connection diagrams of the ART-B22-D125/SP25 3m, SMA are shown below.
| Outline Dimensions & Mechanical Data | |
|---|---|
| Mass | 200 g |
| Case Material | V0 (according to UL 94) |
| Protection Degree | IP57 |
| Output Cable Length | 3 m |
| Termination | 2 stripped wires |
| General Tolerance | ±1 mm |
Note: All dimensions are in millimetres. Refer to the official datasheet for the complete dimension drawing.
Typical applications of the ART-B22-D125/SP25 3m, SMA.
The accuracy class characteristic diagram of the ART-B22-D125/SP25 3m, SMA from the official datasheet is shown below.
| Accuracy & Dynamic Characteristics | |
|---|---|
| Secondary Voltage (US) | 22.5 mV/kA @ 50 Hz, IP = 1 kA |
| Mutual Inductance (M) | 71.98 nH |
| Temperature Coefficient of M (TCM) | ±30 ppm/K |
| Frequency Bandwidth (BW, −3 dB) | 420 kHz (cable length 3 m) |
| Phase Displacement (Δφ) @ 50/60 Hz | 0.004 ° |
| Ratio Error (ε, centered) | −0.5 … +0.5 % |
| Ratio Error (ε, all positions) | −0.75 … +0.75 % (including positioning error) |
| Linearity Error (εL) | None |
| Error due to External Magnetic Field (εI ext) | 0 ±0.2 ±0.4 % |
| Reference Conditions | |
|---|---|
| Ambient Temperature (TA) | 25 °C, unless otherwise noted |
| Rated Frequency (fr) | 50/60 Hz |
Note: For the full set of performance data, refer to the datasheet.
Other models of the ART Series share the same measurement principle, mounting concept and output interface family.
