Product Description

LEM ART-B22-D125-SP3, AC Measurement Rogowski Coils (coil only). 12.5cm Diameter, Class 0.5, 3M Shielded Cable Connection

Flexible clip-around Rogowski coil for the electronic measurement of AC current with galvanic separation between the primary circuit (power) and the secondary circuit (measurement). The patented Perfect Loop Technology dramatically reduces both the error due to the position of the measured conductor within the aperture, and the error due to the proximity of external conductors.

• The ART series single phase flexible rope CT from LEM. In conjunction with combined integrator & signal conditioner LEM offer True RMS 0-5V, 0-10V, 0-20mA, 4-20mA outputs, or direct linear outputs 0.333V or 0.166V
• Included is a 12.5cm diameter rope CT, and 1.5M of twisted pair (1000V) output leads for connection to an integrator, or meter/logger with integration function.
• LEM coils come with 5 year warranty

Features

• Rated insulation voltage 1000 V Cat III PD2
• Accuracy Class 0.5 (IEC 61869-2)
• Protection degree IP67
• ? 70, ? 125, ? 175, ? 300 mm sensing aperture
• 3 m output cable (other lengths available see page 8)
• Ambient temperature ?40 °C … +80 °C
• Very flexible and thin coil: 6.1 mm
• Slot for attaching the loop on the primary with a cable tie
• ? 2 mm hole to pass a security seal tampering
• An innovative patented clasp drastically reduces the positioning error near the closing
• Internal shield for enhanced measurement accuracy at low primary currents.

Advantages

• Thin, flexible, and light weight solution
• Very low positioning error
• Quick, non-intrusive and easy setup
• A single sensor for a large current range without overload
• Less influenced by external fields
• Adaptable for a large range of cable diameters

Applications

• MV/LV substations on LV side: Transformer Condition Monitoring
• Power metering: current measurement for active power calculation
• Building sub-metering: energy efficiency monitoring, consumption analysis and cost allocation
• Power quality monitoring: electrical loads and distribution system equipment
• Fault Detection, Isolation and Repair (FDIR): isolate the site of the fault
• Remote Terminal Units (RTU)
• Phasor Measurement Units (PMU)

Standards

• IEC 61010-1: 2010; IEC 61010-2-32 ed.3: 2012
• 1) IEC 61869-1 ed1.0: 2007; IEC 61869-2: ed1.0: 2012
• 1) IEC 61869-6: draft 2016; IEC 61869-10: draft 2016
• UL

Specification

Datasheet

Application Notes

1) The Rogowski coil can measure any primary current as there is no saturation effect.

2) Not tested given that in the worst case (load = 0 Ohm i.e. short circuit on the output) the peak dissipated power remains low (< 2 Watts)

3) Frequency bandwidth and phase shift modeling schematic can be provided on request.

4) Referring to the main phase offset of 90 ° (a Rogowski coil is a derivative current transducer)

5) Considering a primary conductor of at least ? 15 mm, perpendicular and in contact with the Rogowski coil.

6) Considering an external conductor of at least ? 15 mm the same current level than internal conductor, perpendicular and in contact with the Rogowski coil.