ART series
Ref: ART-B22-D70; ART-B22-D125; ART-B22-D175; ART-B22-D300
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 positionof the measured conductor within the aperture, and the error due to the proximity of external
conductors.

Features

Applications● The most accurate coil of the market,
Class 0.5 (IEC 61869-10)● Secondary distribution substations● Very low positioning error● Small external fields influence● Low sensitivity 22.5 mV/kA to have a very thin coil forindoor application● Electrostatic shield included for better common mode
rejection of the integrator● Protection degree IP57

● ⌀ 70, ⌀ 125, ⌀ 175 and ⌀ 300 mm sensing aperture● Output cable: 1.5 m to 6 m(other lengths available see page 9).

Advantages● Thin, flexible, and light weight solution● Very good accuracy● Does not saturate with overcurrent and short circuitcurrents● Distribution transformer monitoring● Phasor Measurement Units (PMU)● Commercial and industrial buildings● Metering and sub-metering● Demand response (DR)● Distribution system equipment.

Standards● IEC 61010-1: 2010
● IEC 61010-2-32: 2012
● IEC 61869-10: 2017 1)● UL 61010-1: 2012.

Application Domains● Industrial● Smart Grid.

● Excellent immunity to electromagnetic interferences● Fast and easy installation.

Note: 1) Performance standards: ART-B22 only partially fulfills this standard as a Rogowski coil has fundamental differences compared to current transformers.
N°97.M4.99.000.0, N°97.M7.99.000.0, N°97.M8.99.000.0, N° 97.M4.99.003.0; N° 97.M4.99.004.0; N° 97.M4.99.006.0; N° 97.M7.99.003.0; N° 97.M7.99.004.0; N° 97.M7.99.006.0;
Page 1/11
N° 97.M8.99.003.0; N° 97.M8.99.004.0; N° 97.M8.99.006.0; N° 97.N3.99.000.0; N° 97.N3.99.003.0; N° 97.N3.99.004.0, N° 97.N3.99.006.0
LEM International SA
LEM reserves the right to carry out modifications on its transducers,
18October2022/Version 7
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in order to improve them.
1217 Meyrinwww.lem.com

ART series

Safety⚠

CautionIf the device is used in a way that is not specified by the manufacturer, the protection provided by the device may be compromised.
Always inspect the current sensor unit and connecting cable before using this product and do not use it if damaged (for example,
if the contrasting color of the flexible rope is visible).
Mounting assembly shall guarantee the maximum primary busbar temperature, fulfill clearance and creepage distance, minimize
electric and magnetic coupling, and unless otherwise specified can be mounted in any orientation.

Caution, risk of electrical shock
This current sensor must be used in electric/electronic equipment with respect to applicable standards and safety requirements inaccordance with the manufacturer’s operating specifications.
This current sensor is intended for use in an electrical installation with restricted access.
Therefore, in normal operation, it is not accessible. For installation or in maintenance phases, it is accessible only to qualified
person.
It is intended to be connected onto SELV equipment input, of up to 30 V RMS.
When operating, certain parts of the current sensor can carry hazardous voltages (e.g. primary busbar, power supply).
De-energize all circuits and hazardous live parts before installing the product.
All installations, maintenance, servicing operations and use must be carried out by trained and qualified personnel practicing
applicable safety precautions.
If the current sensor is used in a manner not specified by the manufacturer, the protection provided by the equipment may be
impaired.
Ignoring this warning can lead to injury and/or cause serious damage.
This current sensor is a build-in device, whose hazardous live parts must be inaccessible after installation.
This current sensor must be mounted in a suitable end-enclosure.
Use caution during installation, use and uninstalling of this product; high voltages and currents, high temperature (above 70 °C)
may be present inside the electrical equipment.
Use personal protective equipment (clothes, gloves, ...).
This current sensor is a built-in device, not intended to be cleaned with any product. Nevertheless if the user must implement
cleaning or washing process, validation of the cleaning program has to be done by himself.
Do not dispose of this product as unsorted municipal waste. Contact a qualified recycler for disposal.

Risk of electrical shock
Do not apply around or remove from uninsulated hazardous live conductors which may result in electric shock, electric burn or
arc flash.

Equipment protected throughout by double insulation or reinforced insulation.

ESD susceptibility
The product is susceptible to be damaged from an ESD event and the personnel should be grounded when handling it.

Page 2/11
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ART series

Absolute maximum ratings
Parameter

Symbol

Unit

Value

Maximum secondary voltage

US max

V

30

Maximum primary conductor temperature

TB max°C

105

Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum ratings for extended periods may degrade reliability.

UL 61010-1: Ratings and assumptions of certification
File # E330077 , Vol.D1

Standards● UL 61010-1, Third Edition, May 11, 2012, Revised April 29, 2016
● CAN/CSA-C22.2 No. 61010-1-12, 3rd Edition, Revision dated April 29, 2016
● IEC 61010-2-032: 2012 (Third Edition), UL 61010-2-032 (IEC 61010-2-032:2012).
Ratings
Rated insulation voltage AC 1000 V, 50/60 Hz, CAT III, 2000 A.
Engineering conditions of acceptability
When installed in an end-product, consideration must be given to the following:- ART series has been investigated as Type B current sensors according IEC 61010-2-032 3rd ed.
- The devices have been evaluated for overvoltage category III and pollution degree 2 environment use only.
For ART series, the need for the following shall be considered in the end-product:- Markings and documentation that comply with Clause 5.
- The following tests shall be performed in the end-product evaluation: Dielectric Strength.
- The unit is considered acceptable for use in a max ambient of 80 °C for ART series.
- A suitable enclosure shall be provided in the end-use application.
- The terminals have not been evaluated for field wiring.
- Primary conductor or busbar temperature should never exceed 100 °C.

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ART series
Insulation coordination
Parameter

Symbol

Unit

≤
Value

RMS voltage for AC insulation test, 50 Hz, 1 min

Ud

kV

7.4

Impulse withstand voltage 1.2/50 μs

UNi

kV

12.8

Partial discharge RMS test voltage (qm < 10 pC)

Ut

kV

1.65

According to IEC 60664- 1

Comment

Clearance (pri. - sec.)

dCI

mm

> 16

Shortest distance through air

Creepage distance (pri. - sec.)

dCp

mm

> 16

Shortest path along device body

Case material

-

-

V0

According to UL 94

Comparative tracking index

CTI

600

Application example
RMS voltage line-to-neutral

V

1000

Basic insulationaccording to IEC 61010-1
CAT IV, PD2

Application example
RMS voltage line-to-neutral

V

1000

Reinforced insulationaccording to IEC 61010-1
CAT III, PD2

Typ

Max

Environmental and mechanical characteristics
Parameter

SymbolUnit

Min

Ambient operating temperature

TA

°C

−40

80

Ambient storage temperature

TA st

°C

−40

80

Relative humidity (non-condensing)

RH

%

0

90

Altitude above sea level
Mass ⌀ 70

Mass ⌀ 125

Mass ⌀ 175

Mass ⌀ 300mm

g

Comment

2000
124

Cable length: 1.5 m

m

g

130

Cable length: 1.5 m

m

g

138

Cable length: 1.5 m

m

g

155

Cable length: 1.5 m

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ART series
Electrical data ART-B22-D70
At TA = 25 °C, RL = 10 kΩ, unless otherwise noted.

Parameter

SymbolUnit

Rated primary current

IPrA

Rated short-time thermal current

Ith

kA

300

@ 50 Hz 2)

Rated transformation ratio

kr

kA/V

44.44

@ 50 Hz

Rated frequency

fr

Hz

50/60

Secondary voltage

US

mV

22.5

Mutual inductance

M

nH

71.98

Temperature coefficient of M

TCM

ppm/k

±30

Frequency bandwidth (−3 dB)

BW

kHz

420

3)

Phase displacement 4) @ 50/60 Hz

Δφ

°

0.004

3)

Coil inductance

LS

µH

180

Coil resistance

RS

Ω

56

Ratio error (centered)

ε

%

−0.5

0.5

Class 0.5 accuracy
according to IEC 61869-10

Ratio error (all positions)

ε

%

−0.75

0.75

5)

Linearity error

εL%Error due to magnetic field of external conductor
current

εI ext

%

±0.4

6)

Notes:

Min

Typ

Max

Comment
Not applicable 1)@ 50 Hz, IP = 1 kA

Cable length: 1.5 m

Including positioning error

None
0

±0.2

The Rogowski coil can measure any primary current as there is no saturation effect.
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 on contact with the Rogowski coil.
6)
Considering an external conductor of at least ⌀15 mm the same current level than internal conductor,
perpendicular and on contact with the Rogowski coil.
1)
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ART series
Electrical data ART-B22-D125
At TA = 25 °C, RL = 10 kΩ, unless otherwise noted.

Parameter

SymbolUnit

Rated primary current

IPrA

Rated short-time thermal current

Ith

kA

300

@ 50 Hz 2)

Rated transformation ratio

kr

kA/V

44.44

@ 50 Hz

Rated frequency

fr

Hz

50/60

Secondary voltage

US

mV

22.5

Mutual inductance

M

nH

72.14

Temperature coefficient of M

TCM

ppm/k

±30

Frequency bandwidth (−3 dB)

BW

kHz

373

3)

Phase displacement 4) @ 50/60 Hz

Δφ

°

0.004

3)

Coil inductance

LS

µH

258

Coil resistance

RS

Ω

81

Ratio error (centered)

ε

%

−0.5

0.5

Class 0.5 accuracy
according to IEC 61869-10

Ratio error (all positions)

ε

%

−0.75

0.75

5)

Linearity error

εL%Error due to magnetic field of external
conductor current

εI ext

%

±0.4

6)

Notes:

Min

Typ

Max

Comment
Not applicable 1)@ 50 Hz, IP = 1 kA

Cable length: 1.5 m

Including positioning error

None
0

±0.2

The Rogowski coil can measure any primary current as there is no saturation effect.
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 on contact with the Rogowski coil.
6)
Considering an external conductor of at least ⌀15 mm the same current level than internal conductor,
perpendicular and on contact with the Rogowski coil.
1)
2)Page 6/11
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ART series
Electrical data ART-B22-D175
At TA = 25 °C, RL = 10 kΩ, unless otherwise noted.

Parameter

SymbolUnit

Rated primary current

IPrA

Rated short-time thermal current

Ith

kA

300

@ 50 Hz 2)

Rated transformation ratio

kr

kA/V

44.44

@ 50 Hz

Rated frequency

fr

Hz

50/60

Secondary voltage

US

mV

22.5

Mutual inductance

M

nH

72.31

Temperature coefficient of M

TCM

ppm/k

±30

Frequency bandwidth (−3 dB)

BW

kHz

350

3)

Phase displacement 4) @ 50/60 Hz

Δφ

°

0.004

3)

Coil inductance

LS

µH

343

Coil resistance

RS

Ω

105

Ratio error (centered)

ε

%

−0.5

0.5

Class 0.5 accuracy
according to IEC 61869-10

Ratio error (all positions)

ε

%

−0.75

0.75

5)

Linearity error

εL%Error due to magnetic field of external conductor
current

εI ext

%

±0.4

6)

Notes:

Min

Typ

Max

Comment
Not applicable 1)@ 50 Hz, IP = 1 kA

Cable length: 1.5 m

Including positioning error

None
0

±0.2

The Rogowski coil can measure any primary current as there is no saturation effect.
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 on contact with the Rogowski coil.
6)
Considering an external conductor of at least ⌀15 mm the same current level than internal conductor,
perpendicular and on contact with the Rogowski coil.
1)
2)Page 7/11
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ART series
Electrical data ART-B22-D300
At TA = 25 °C, RL = 10 kΩ, unless otherwise noted.

Parameter

SymbolUnit

Rated primary current

IPrA

Rated short-time thermal current

Ith

kA

300

@ 50 Hz 2)

Rated transformation ratio

kr

kA/V

44.44

@ 50 Hz

Rated frequency

fr

Hz

50/60

Secondary voltage

US

mV

22.5

Mutual inductance

M

nH

72.84

Temperature coefficient of M

TCM

ppm/k

±30

Frequency bandwidth (−3 dB)

BW

kHz

300

3)

Phase displacement 4) @ 50/60 Hz

Δφ

°

0.004

3)

Coil inductance

LS

µH

566

Coil resistance

RS

Ω

170

Ratio error (centered)

ε

%

−0.5

0.5

Class 0.5 accuracy
according to IEC 61869-10

Ratio error (all positions)

ε

%

−0.75

0.75

5)

Linearity error

εL%Error due to magnetic field of external conductor
current

εI ext

%

±0.4

6)

Notes:

Min

Typ

Max

Comment
Not applicable 1)@ 50 Hz, IP = 1 kA

Cable length: 1.5 m

Including positioning error

None
0

±0.2

The Rogowski coil can measure any primary current as there is no saturation effect.
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 on contact with the Rogowski coil.
6)
Considering an external conductor of at least ⌀15 mm the same current level than internal conductor,
perpendicular and on contact with the Rogowski coil.
1)
2)

Definition of typical, minimum and maximum values
Minimum and maximum values for specified limiting and safety conditions have to be understood as such as well as values shownin “typical” graphs.
On the other hand, measured values are part of a statistical distribution that can be specified by an interval with upper and lower
limits and a probability for measured values to lie within this interval.
Unless otherwise stated (e.g. “100 % tested”), the LEM definition for such intervals designated with “min” and “max” is that theprobability for values of samples to lie in this interval is 99.73 %.
For a normal (Gaussian) distribution, this corresponds to an interval between −3 sigma and +3 sigma. If “typical” values are notobviously mean or average values, those values are defined to delimit intervals with a probability of 68.27 %, corresponding to aninterval between −sigma and +sigma for a normal distribution.
Typical, minimum and maximum values are determined during the initial characterization of the product.
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ART series

Name and codification

ART-B22-DXXXFamily:Rogowski coil

Product nameOutput signal:
22.5: mV/kA

Length (m)Mass (g)ART-B22-D70/SP3

3

192

ART-B22-D70/SP4

4.5

259

ART-B22-D70/SP66327

ART-B22-D125/SP3

3

198

ART-B22-D125/SP4

4.5

265

ART-B22-D125/SP66333

ART-B22-D175/SP3

3

206

ART-B22-D175/SP4

4.5

273

ART-B22-D175/SP6

6341

ART-B22-D300/SP3

3

222

ART-B22-D300/SP4

4.5

290

ART-B22-D300/SP6

6357

Aperture
D70:⌀ 70 mm
D125: ⌀ 125 mm
D175: ⌀ 175 mm
D300: ⌀ 300 mm

Accuracy class according to IEC 61869-10

Accuracy class limit of IEC 61869-10
Accuracy class limit of ART-B22 Rogowski
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ART series

Terms and definitions
Rated transformation ratio kr
kr is the ratio between the primary current IP and the secondary
voltage US.

kr =

IP
US

Ratio error ε
The current ratio error, expressed as a percentage, is definedby the formula:ε=kr US − IP

Where:

IP× 100 %

kr: is the rated transformation ratio
IP: is the actual primary current
US: is the actual secondary voltage when IP is		flowingPhase displacement ∆φ
The Δφ is the difference in phase between the primary current
and the ideal secondary voltage phasors. The direction of
the phasors being that the angle is 90 ° (leading) for an ideal
Rogowski coil.
The phase displacement is said to be positive when thesecondary voltage phasor leads the primary current phasor.

Linearity error εL
The linearity error εL is the maximum positive or negative
difference between the measured points and the linear
regression line, expressed as a percentage of IPr.

Rated short-time thermal current Ith
Maximum value of the primary current which the Rogowski willwithstand for a specified short time without suffering harmful
effects.

Crosstalk error εXT
The crosstalk error defines how an external current passing
in a close proximity to the product influences its performance.
The crosstalk error expressed in percentage is given by theformula:S XT − Sref=
ε XT× 100 %
Sref
Where:
Sref: is the sensitivity of the product measured		in the center
SXT: is the sensitivity of the product measured withan		
external conductor of at least 15 mm and with the		same current level than internal conductor,
		
perpendicular and in contact with the		Rogowski coil.

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ART series
Dimensions (in mm)

Connection
diP/dtIP

US+US-Mechanical characteristics● General tolerance● Output cable length● Termination● Cable tie maximum effort±1 mm
see table page 9
or drawing above
2 stripped wires
50 N

Remarks● US = US+ − US- is positive when an increasing primary current
di/dt flows in the direction of the arrow.
● Due to low positioning error (εPOS), the device does not need
to be physically fastened around the primary conductor.
Should the device be secured, make sure no mechanicalstress is applied to the coil itself.
● This product is not intended for outdoor use.
● Installation of the transducer must be done unless otherwise
specified on the datasheet, according to LEM Transducer
Generic Mounting Rules. Please refer to LEM document
N°ANE120504 available on our Web site:
https://www.lem.com/en/file/3137/download/.

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