SPLIT CORE CURRENT TRANSFORMER
ATO Series
IPr = 10, 15, 16, 20, 30, 32, 50, 60, 63, 75 A
Ref: ATO-XXX-B333-D10
ATO series is a split core current transformer for the electronic measurement of AC waveform current with galvanic
separation between the primary circuit (power) and the secondary circuit (measurement).
ATO series is an ideal current transformer for new Smart-Grid applications, in which ratio error and phase
displacement are fully tested with IEC 61869 standards accordance.
Accuracy Class 1
IP
IOUT
RL
A
45.5
mm
B
15.8
C
33.5
D
24
E
32
Ø
10
Features
Applications
●● Split-core current transformer
●● Hybrid inverter (Home Energy Storage)
●● Rated primary current: 10 A - 15 A - 16 A - 20 A - 30 A - 32
A - 50 A - 60 A - 63 A - 75 A
●● Power metering: current measurement for active power
calculation
●● Application up to 600 V CAT III PD2, basic insulation
●● Building sub-metering: energy efficiency monitoring,
consumption analysis and cost allocation
●● Accuracy class 1 (IEC 61869-2)
●● Voltage output, 333 mV at IPr
●● ⌀ 10 mm sensing aperture
●● Power quality monitoring: electrical loads and distribution
system equipment
●● Distributed measurement systems
●● 1 m output cable
●● Ambient temperature −10 °C … +55 °C
●● Very low cost solution
●● Condition monitoring (e.g. Motor loads such as conveyers,
pumps).
●● Slot for attaching the C.T. on the primary with plastic tie
Standards
●● DIN rail adapter (optional).
●● IEC 61010-1: 2010
●● IEC 61010-031 ed1.1: 2012
Advantages
●● No interruption of electricity during installation on insulated
conductors
●● Quick, non-intrusive and easy setup
●● Provide a calibrate output.
●● IEC 61869-1 ed1.0: 2007
●● IEC 61869-2: ed1.0: 2012
●● IEC 61869-6: draft 2016
●● IEC 61869-10: draft 2016
●● UL 508: 2013.
N°52.C9.13.000.0; N°52.C9.15.000.0; N°52.C9.J5.000.0; N°52.C9.17.000.0; N°52.C9.20.000.0; N°52.C9.J3.000.0; N°52.C9.25.000.0; N°52.C9.27.000.0; N°52.C9.G8.000.0; N°52.C9.30.000.0;
Page 1/18
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com
SPLIT CORE CURRENT TRANSFORMER
ATO Series
Absolute maximum ratings
Parameter
Primary conductor temperature
Symbol
Unit
Value
TB
°C
100
Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum ratings for extended periods may degrade reliability.
UL 508: Ratings and assumptions of certification
File # E189713 Volume: 2 Section: 8
Standards
●● CSA C22.2 NO. 14-10 INDUSTRIAL CONTROL EQUIPMENT - Edition 11 - Revision Date 2011/08/01
●● UL 508 STANDARD FOR INDUSTRIAL CONTROL EQUIPMENT - Edition 17 - Revision Date 2013/10/16
For use only in complete equipment where the acceptability of the combination is determined by UL.LLC.
Ratings
Parameter
Symbol
Primary involved potential
Unit
Value
V AC/DC
1000
Max surrounding air temperature
TA
°C
70
Primary current
IP
A
125
Conditions of acceptability
When installed in the end-use equipment, consideration shall be given to the following:
- These devices must be mounted in a suitable end-use enclosure.
- The terminals have not been evaluated for field wiring
- The products shall be used in a pollution degree 2
- Based on results of temperature test, in the end-use application a maximum of 100 °C can not be exceeded
on the primary conductor.
Marking
Only those products bearing the UL or UR Mark should be considered to be Listed or Recognized and covered under UL’s
Follow-Up Service. Always lood for the Mark on the product.
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com
SPLIT CORE CURRENT TRANSFORMER
ATO Series
Insulation coordination
Parameter
Symbol
Unit
Value
Comment
Rms voltage for AC insulation test, 50 Hz, 1 min
Ud
kV
4.3
Impulse withstand voltage 1.2/50 µs
ÛW
kV
7.8
Partial discharge extinction rms voltage @ 10 pC
Ue
kV
1.8
Clearance (pri. - sec.)
dCI
mm
8
Shortest distance through
air
Creepage distance (pri. - sec.)
dCp
mm
8
Shortest path along device
body
Case material flammability
-
--
V0
Application example
-
600 V CAT III
PD2
Reinforced insulation
according to EN 50178
Application example
-
300 V CAT III
PD2
Reinforced insulation
according to EN 61010-1
Application example
-
600 V CAT IV
PD2
Basic insulation according
to EN 61010-1
Application example
-
1000 V CAT III Basic insulation according
PD2
to EN 61010-1
Application example
-
Between primary
(completely filling the hole)
and secondary
According to UL 94
According to UL 508
Environmental and mechanical characteristics
Parameter
Symbol
Unit
Min
Typ
Max
Ambient operating temperature
TA
°C
−10
25
55
Ambient storage temperature
TS
°C
−30
90
Relative humidity (non-condensing)
RH
%
0
85
Altitude above sea level
m
2000
Surrounding temperature according to UL
°C
70
Mass
m
g
Comment
81
Page 3/18
28March2016/version 0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com
SPLIT CORE CURRENT TRANSFORMER
ATO Series
Electrical data ATO-10-B333-D10
At TA = 25 °C, Rbr = 100 kΩ, unless otherwise noted.
Parameter
Symbol
Unit
Min
Rated burden
Rbr
kΩ
100
Rated primary current
IPr
A
10
Rated extended primary current
IePr
A
12
Rated short-time thermal current
Ith
kA
0.6
1)
Rated dynamic current
Idyn
kA
1.5
at 50 Hz; 2.5 x Ith
Rated transformation ratio
kra
A/V
30
Rated secondary voltage
USr
mV
333
fr
Hz
50/60
Symbol
Unit
Min
Frequency bandwidth (−3 dB)
BW
kHz
1.5
Phase displacement
∆φ
°
−1
TCIout
ppm/k
Ratio error
ε
%
−1
1
Linearity error
εL
%
−0.1
0.1
Influence of external conductor
εext
%
Rated frequency
Parameter
Temperature coefficient of Iout
Notes:
Value
Typ
Max
Comment
120 % of IPr
at 50 Hz; 60 x IPr (1 s)
Max
1
Comment
2)
Short circuit condition (no load).
3)
(−10 °C ... 55 °C) Detail page 14
3)
(−10 °C ... 55 °C) Detail page 14
80
0.3
No test conducted given that is the worst case (load = 100 kΩ i.e short circuit on the output) the peak dissipated
power remains low.
2)
Frequency bandwidth and phase shift modeling schematic can be provided on request.
3)
Considering a primary conductor of at least ⌀ 9 mm perpendicular to the current transfomer. All our LEMcity transducers
class I are tested at 5 %, 20 % 100 % and 120 % of IPr to be according to IEC61869-2 table 201.
1)
Page 4/18
28March2016/version 0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com
SPLIT CORE CURRENT TRANSFORMER
ATO Series
Electrical data ATO-15-B333-D10
At TA = 25 °C, Rbr = 100 kΩ, unless otherwise noted.
Parameter
Symbol
Unit
Min
Rated burden
Rbr
kΩ
100
Rated primary current
IPr
A
15
Rated extended primary current
IePr
A
18
Rated short-time thermal current
Ith
kA
0.9
Rated dynamic current
Idyn
kA
2.25
Rated transformation ratio
kra
A/V
45.05
Rated secondary voltage
USr
mV
333
fr
Hz
50/60
Symbol
Unit
Min
Frequency bandwidth (−3 dB)
BW
kHz
1.5
Phase displacement
∆φ
°
−1
TCIout
ppm/k
Ratio error
ε
%
−1
1
Linearity error
εL
%
−0.1
0.1
Influence of external conductor
εext
%
Rated frequency
Parameter
Temperature coefficient of Iout
Notes:
Value
Typ
Max
Comment
120 % of IPr
1)
at 50 Hz; 60 x IPr (1 s)
at 50 Hz; 2.5 x Ith
Max
1
Comment
2)
Short circuit condition (no load).
3)
(−10 °C ... 55 °C) Detail page 14
3)
(−10 °C ... 55 °C) Detail page 14
80
0.3
No test conducted given that is the worst case (load = 100 kΩ i.e short circuit on the output) the peak dissipated
power remains low.
2)
Frequency bandwidth and phase shift modeling schematic can be provided on request.
3)
Considering a primary conductor of at least ⌀ 9 mm perpendicular to the current transfomer. All our LEMcity transducers
class I are tested at 5 %, 20 % 100 % and 120 % of IPr to be according to IEC61869-2 table 201.
1)
Page 5/18
28March2016/version 0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com
SPLIT CORE CURRENT TRANSFORMER
ATO Series
Electrical data ATO-16-B333-D10
At TA = 25 °C, Rbr = 100 kΩ, unless otherwise noted.
Parameter
Symbol
Unit
Min
Rated burden
Rbr
kΩ
100
Rated primary current
IPr
A
16
Rated extended primary current
IePr
A
19.2
Rated short-time thermal current
Ith
kA
0.96
Rated dynamic current
Idyn
kA
2.4
Rated transformation ratio
kra
A/V
48.05
Rated secondary voltage
USr
mV
333
fr
Hz
50/60
Symbol
Unit
Min
Frequency bandwidth (−3 dB)
BW
kHz
1.5
Phase displacement
∆φ
°
−1
TCIout
ppm/k
Ratio error
ε
%
−1
1
Linearity error
εL
%
−0.1
0.1
Influence of external conductor
εext
%
Rated frequency
Parameter
Temperature coefficient of Iout
Notes:
Value
Typ
Max
Comment
120 % of IPr
1)
at 50 Hz; 60 x IPr (1 s)
at 50 Hz; 2.5 x Ith
Max
1
Comment
2)
Short circuit condition (no load).
3)
(−10 °C ... 55 °C) Detail page 14
3)
(−10 °C ... 55 °C) Detail page 14
80
0.3
No test conducted given that is the worst case (load = 100 kΩ i.e short circuit on the output) the peak dissipated
power remains low.
2)
Frequency bandwidth and phase shift modeling schematic can be provided on request.
3)
Considering a primary conductor of at least ⌀ 9 mm perpendicular to the current transfomer. All our LEMcity transducers
class I are tested at 5 %, 20 % 100 % and 120 % of IPr to be according to IEC61869-2 table 201.
1)
Page 6/18
28March2016/version 0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com
SPLIT CORE CURRENT TRANSFORMER
ATO Series
Electrical data ATO-20-B333-D10
At TA = 25 °C, Rbr = 100 kΩ, unless otherwise noted.
Parameter
Symbol
Unit
Min
Rated burden
Rbr
kΩ
100
Rated primary current
IPr
A
20
Rated extended primary current
IePr
A
24
Rated short-time thermal current
Ith
kA
1.2
Rated dynamic current
Idyn
kA
3
Rated transformation ratio
kra
A/V
60
Rated secondary voltage
USr
mV
333
fr
Hz
50/60
Symbol
Unit
Min
Frequency bandwidth (−3 dB)
BW
kHz
1.5
Phase displacement
∆φ
°
−1
TCIout
ppm/k
Ratio error
ε
%
−1
1
Linearity error
εL
%
−0.1
0.1
Influence of external conductor
εext
%
Rated frequency
Parameter
Temperature coefficient of Iout
Notes:
Value
Typ
Max
Comment
120 % of IPr
1)
at 50 Hz; 60 x IPr (1 s)
at 50 Hz; 2.5 x Ith
Max
1
Comment
2)
Short circuit condition (no load).
3)
(−10 °C ... 55 °C) Detail page 14
3)
(−10 °C ... 55 °C) Detail page 14
80
0.3
No test conducted given that is the worst case (load = 100 kΩ i.e short circuit on the output) the peak dissipated
power remains low.
2)
Frequency bandwidth and phase shift modeling schematic can be provided on request.
3)
Considering a primary conductor of at least ⌀ 9 mm perpendicular to the current transfomer. All our LEMcity transducers
class I are tested at 5 %, 20 % 100 % and 120 % of IPr to be according to IEC61869-2 table 201.
1)
Page 7/18
28March2016/version 0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com
SPLIT CORE CURRENT TRANSFORMER
ATO Series
Electrical data ATO-30-B333-D10
At TA = 25 °C, Rbr = 100 kΩ, unless otherwise noted.
Parameter
Symbol
Unit
Min
Rated burden
Rbr
kΩ
100
Rated primary current
IPr
A
30
Rated extended primary current
IePr
A
36
Rated short-time thermal current
Ith
kA
1.8
1)
Rated dynamic current
Idyn
kA
3.6
at 50 Hz; 2.5 x Ith
Rated transformation ratio
kra
A/V
90
Rated secondary voltage
USr
mV
333
fr
Hz
50/60
Symbol
Unit
Min
Frequency bandwidth (−3 dB)
BW
kHz
1.5
Phase displacement
∆φ
°
−1
TCIout
ppm/k
Ratio error
ε
%
−1
1
Linearity error
εL
%
−0.1
0.1
Influence of external conductor
εext
%
Rated frequency
Parameter
Temperature coefficient of Iout
Notes:
Value
Typ
Max
Comment
120 % of IPr
at 50 Hz; 60 x IPr (1 s)
Max
1
Comment
2)
Short circuit condition (no load).
3)
(−10 °C ... 55 °C) Detail page 14
3)
(−10 °C ... 55 °C) Detail page 14
80
0.3
No test conducted given that is the worst case (load = 100 kΩ i.e short circuit on the output) the peak dissipated
power remains low.
2)
Frequency bandwidth and phase shift modeling schematic can be provided on request.
3)
Considering a primary conductor of at least ⌀ 9 mm perpendicular to the current transfomer. All our LEMcity transducers
class I are tested at 5 %, 20 % 100 % and 120 % of IPr to be according to IEC61869-2 table 201.
1)
Page 8/18
28March2016/version 0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com
SPLIT CORE CURRENT TRANSFORMER
ATO Series
Electrical data ATO-32-B333-D10
At TA = 25 °C, Rbr = 100 kΩ, unless otherwise noted.
Parameter
Symbol
Unit
Min
Rated burden
Rbr
kΩ
100
Rated primary current
IPr
A
32
Rated extended primary current
IePr
A
38.4
Rated short-time thermal current
Ith
kA
1.92
Rated dynamic current
Idyn
kA
4.8
Rated transformation ratio
kra
A/V
96
Rated secondary voltage
USr
mV
333
fr
Hz
50/60
Symbol
Unit
Min
Frequency bandwidth (−3 dB)
BW
kHz
1.5
Phase displacement
∆φ
°
−1
TCIout
ppm/k
Ratio error
ε
%
−1
1
Linearity error
εL
%
−0.1
0.1
Influence of external conductor
εext
%
Rated frequency
Parameter
Temperature coefficient of Iout
Notes:
Value
Typ
Max
Comment
120 % of IPr
1)
at 50 Hz; 60 x IPr (1 s)
at 50 Hz; 2.5 x Ith
Max
1
Comment
2)
Short circuit condition (no load).
3)
(−10 °C ... 55 °C) Detail page 14
3)
(−10 °C ... 55 °C) Detail page 14
80
0.3
No test conducted given that is the worst case (load = 100 kΩ i.e short circuit on the output) the peak dissipated
power remains low.
2)
Frequency bandwidth and phase shift modeling schematic can be provided on request.
3)
Considering a primary conductor of at least ⌀ 9 mm perpendicular to the current transfomer. All our LEMcity transducers
class I are tested at 5 %, 20 % 100 % and 120 % of IPr to be according to IEC61869-2 table 201.
1)
Page 9/18
28March2016/version 0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com
SPLIT CORE CURRENT TRANSFORMER
ATO Series
Electrical data ATO-50-B333-D10
At TA = 25 °C, Rbr = 100 kΩ, unless otherwise noted.
Parameter
Symbol
Unit
Min
Rated burden
Rbr
kΩ
100
Rated primary current
IPr
A
50
Rated extended primary current
IePr
A
60
Rated short-time thermal current
Ith
kA
3
Rated dynamic current
Idyn
kA
7.5
Rated transformation ratio
kra
A/V
150
Rated secondary voltage
USr
mV
333
fr
Hz
50/60
Symbol
Unit
Min
Frequency bandwidth (−3 dB)
BW
kHz
1.5
Phase displacement
∆φ
°
−1
TCIout
ppm/k
Ratio error
ε
%
−1
1
Linearity error
εL
%
−0.1
0.1
Influence of external conductor
εext
%
Rated frequency
Parameter
Temperature coefficient of Iout
Notes:
Value
Typ
Max
Comment
120 % of IPr
1)
at 50 Hz; 60 x IPr (1 s)
at 50 Hz; 2.5 x Ith
Max
1
Comment
2)
Short circuit condition (no load).
3)
(−10 °C ... 55 °C) Detail page 14
3)
(−10 °C ... 55 °C) Detail page 14
80
0.3
No test conducted given that is the worst case (load = 100 kΩ i.e short circuit on the output) the peak dissipated
power remains low.
2)
Frequency bandwidth and phase shift modeling schematic can be provided on request.
3)
Considering a primary conductor of at least ⌀ 9 mm perpendicular to the current transfomer. All our LEMcity transducers
class I are tested at 5 %, 20 % 100 % and 120 % of IPr to be according to IEC61869-2 table 201.
1)
Page 10/18
28March2016/version 0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com
SPLIT CORE CURRENT TRANSFORMER
ATO Series
Electrical data ATO-60-B333-D10
At TA = 25 °C, Rbr = 100 kΩ, unless otherwise noted.
Parameter
Symbol
Unit
Min
Rated burden
Rbr
kΩ
100
Rated primary current
IPr
A
60
Rated extended primary current
IePr
A
72
Rated short-time thermal current
Ith
kA
3.6
Rated dynamic current
Idyn
kA
9
Rated transformation ratio
kra
A/V
180
Rated secondary voltage
USr
mV
333
fr
Hz
50/60
Symbol
Unit
Min
Frequency bandwidth (−3 dB)
BW
kHz
1.5
Phase displacement
∆φ
°
−1
TCIout
ppm/k
Ratio error
ε
%
−1
1
Linearity error
εL
%
−0.1
0.1
Influence of external conductor
εext
%
Rated frequency
Parameter
Temperature coefficient of Iout
Notes:
Value
Typ
Max
Comment
120 % of IPr
1)
at 50 Hz; 60 x IPr (1 s)
at 50 Hz; 2.5 x Ith
Max
1
Comment
2)
Short circuit condition (no load).
3)
(−10 °C ... 55 °C) Detail page 14
3)
(−10 °C ... 55 °C) Detail page 14
80
0.3
No test conducted given that is the worst case (load = 100 kΩ i.e short circuit on the output) the peak dissipated
power remains low.
2)
Frequency bandwidth and phase shift modeling schematic can be provided on request.
3)
Considering a primary conductor of at least ⌀ 9 mm perpendicular to the current transfomer. All our LEMcity transducers
class I are tested at 5 %, 20 % 100 % and 120 % of IPr to be according to IEC61869-2 table 201.
1)
Page 11/18
28March2016/version 0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com
SPLIT CORE CURRENT TRANSFORMER
ATO Series
Electrical data ATO-63-B333-D10
At TA = 25 °C, Rbr = 100 kΩ, unless otherwise noted.
Parameter
Symbol
Unit
Min
Rated burden
Rbr
kΩ
100
Rated primary current
IPr
A
63
Rated extended primary current
IePr
A
75.6
Rated short-time thermal current
Ith
kA
3.78
1)
Rated dynamic current
Idyn
kA
9.45
at 50 Hz; 2.5 x Ith
Rated transformation ratio
kra
A/V
189
Rated secondary voltage
USr
mV
333
fr
Hz
50/60
Symbol
Unit
Min
Frequency bandwidth (−3 dB)
BW
kHz
1.5
Phase displacement
∆φ
°
−1
TCIout
ppm/k
Ratio error
ε
%
−1
1
Linearity error
εL
%
−0.1
0.1
Influence of external conductor
εext
%
Rated frequency
Parameter
Temperature coefficient of Iout
Notes:
Value
Typ
Max
Comment
120 % of IPr
at 50 Hz; 60 x IPr (1 s)
Max
1
Comment
2)
Short circuit condition (no load).
3)
(−10 °C ... 55 °C) Detail page 14
3)
(−10 °C ... 55 °C) Detail page 14
80
0.3
No test conducted given that is the worst case (load = 100 kΩ i.e short circuit on the output) the peak dissipated
power remains low.
2)
Frequency bandwidth and phase shift modeling schematic can be provided on request.
3)
Considering a primary conductor of at least ⌀ 9 mm perpendicular to the current transfomer. All our LEMcity transducers
class I are tested at 5 %, 20 % 100 % and 120 % of IPr to be according to IEC61869-2 table 201.
1)
Page 12/18
28March2016/version 0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com
SPLIT CORE CURRENT TRANSFORMER
ATO Series
Electrical data ATO-75-B333-D10
At TA = 25 °C, Rbr = 100 kΩ, unless otherwise noted.
Parameter
Symbol
Unit
Min
Rated burden
Rbr
kΩ
100
Rated primary current
IPr
A
75
Rated extended primary current
IePr
A
90
Rated short-time thermal current
Ith
kA
4.5
Rated dynamic current
Idyn
kA
11.25
Rated transformation ratio
kra
A/V
270
Rated secondary voltage
USr
mV
333
fr
Hz
50/60
Symbol
Unit
Min
Frequency bandwidth (−3 dB)
BW
kHz
1.5
Phase displacement
∆φ
°
−1
TCIout
ppm/k
Ratio error
ε
%
−1
1
Linearity error
εL
%
−0.1
0.1
Influence of external conductor
εext
%
Rated frequency
Parameter
Temperature coefficient of Iout
Notes:
Value
Typ
Max
Comment
120 % of IPr
1)
at 50 Hz; 60 x IPr (1 s)
at 50 Hz; 2.5 x Ith
Max
1
Comment
2)
Short circuit condition (no load).
3)
(−10 °C ... 55 °C) Detail page 14
3)
(−10 °C ... 55 °C) Detail page 14
80
0.3
No test conducted given that is the worst case (load = 100 kΩ i.e short circuit on the output) the peak dissipated
power remains low.
2)
Frequency bandwidth and phase shift modeling schematic can be provided on request.
3)
Considering a primary conductor of at least ⌀ 9 mm perpendicular to the current transfomer. All our LEMcity transducers
class I are tested at 5 %, 20 % 100 % and 120 % of IPr to be according to IEC61869-2 table 201.
1)
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 shown
in “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 the
probability 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 not
obviously mean or average values, those values are defined to delimit intervals with a probability of 68.27 %, corresponding to an
interval 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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SPLIT CORE CURRENT TRANSFORMER
ATO Series
Typical performance characteristics
Accuracy class 1 according to IEC 61869-2
At TA = 25 °C, at frequency = 50 Hz, Rbr = 100 kΩ, unless otherwise noted.
4.000
4.000
3.000
Class I limitation
Accuracy(%)
2.000
1.000
0.000
-1.000
0
20
40
60
80
100
120
-2.000
Phase displacement(e
e
3.000
-3.000
Class I limitation
2.000
1.000
0.000
-1.000
0
20
40
60
80
100
120
-2.000
-3.000
-4.000
-4.000
Percentage of 3U(%)
Percentage of Pr(%)
Figure 2: Phase displacement vs. primary current
Figure 1: Accuracy vs. primary current
Ratio error
% of IPr
Phase displacement
5%
20 %
100 %
120 %
5%
20 %
100 %
120 %
Maximum
3.0 %
1.5 %
1.0 %
1.0 %
3.0°
1.5°
1.0°
1.0°
Minimum
−3.0 %
−1.5 %
−1.0 %
−1.0 %
−3.0°
−1.5°
−1.0°
−1.0°
At TA = 25 °C, at frequency = 60 Hz, Rbr = 100 kΩ, unless otherwise noted.
4.000
4.000
2.000
Accuracy(%)
3.000
Class I limitation
1.000
0.000
-1.000
0
20
40
60
80
100
120
-2.000
e
-3.000
Phase displacement(e
e
3.000
Class I limitation
2.000
1.000
0.000
-1.000
0
20
40
60
80
100
120
-2.000
-3.000
-4.000
-4.000
Percentage of Pr(%)
Percentage of 3U(%)
Figure 3: Accuracy vs. primary current
Figure 4: Phase displacement vs. primary current
Ratio error
% of IPr
Phase displacement
5%
20 %
100 %
120 %
5%
20 %
100 %
120 %
Maximum
3.0 %
1.5 %
1.0 %
1.0 %
3.0°
1.5°
1.0°
1.0°
Minimum
−3.0 %
−1.5 %
−1.0 %
−1.0 %
−3.0°
−1.5°
−1.0°
−1.0°
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LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
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SPLIT CORE CURRENT TRANSFORMER
ATO Series
Performance parameters definition
Rated transformation ratio Kra
Rated short-time thermal current Ith
Ratio of Kra to the actual secondary voltage or current.
Ratio error ε
Maximum value of the primary current which a transformer will
withstand for a specified short time without suffering harmful
effects, the secondary winding being short-circuited.
The current ratio error, expressed in per cent, is given by the
formula:
Rated dynamic current Idyn
ε=
kra Is − IP
IP
× 100 %
Where:
Maximum peak value of the primary current which a
transformer will withstand, without being damaged electrically
or mechanically by the resulting electromagnetic forces, the
secondary winding being short-circuited.
Kra: is the rated transformation ratio
IP: is the actual primary current
IS: is the actual secondary current when IP is
flowing, under the conditions of measurement
Phase displacement ∆φ
The ∆φ is the difference in phase between the primary voltage
or current and the secondary voltage or current phasors. The
direction of the phasors being so chosen that the angle is zero
for an ideal transformer.
The phase displacement is said to be positive when the
secondary voltage or current phasors leads the primary voltage
or current phasors.
Linearity error εL
The linearity error εL is the maximum positive or negative
difference between the measured points and a corresponding
linear regression line, expressed in % of IPr.
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SPLIT CORE CURRENT TRANSFORMER
ATO Series
ATO-XXX-B333-D10 series: name and codification
ATO-XXX-B333-D10
Signal type: Technology: Signal
Current
AC
processing:
transformer
Ferrite core
Instanteneous
output
Safety and warning notes
IPr Case
type:
Split
core
Output signal
1I:
Inst. turn ratio
(1: 1000)
225: 225 mV at IPN
333: 333 mV at IPN
Aperture
D10: ⌀ 10 mm
D16: ⌀ 16 mm
In order to guarantee safe operation of the transducer and to be able to make proper use of all features and functions, please
read these instructions thoroughly!
Safe operation can only be guaranteed if the transducer is used for the purpose it has been designed for and within the limits of
the technical specifications.
Ensure you get up-to-date technical information that can be found in the latest associated datasheet under www.lem.com.
Caution! Risk of danger
Ignoring the warnings can lead to serious injury and/or cause damage! The electric measuring transducer may only be installed
and put into operation by qualified personnel that have received an appropriate training.
The corresponding national regulations shall be observed during installation and operation of the transducer and any electrical
conductor.
The transducer shall be used in electric/electronic equipment with respect to applicable standards and safety requirements and
in accordance with all the related systems and components manufacturers’ operating instructions.
Caution! Risk of electrical shock
When operating the transducer, certain parts of the module may carry hazardous live voltage (e.g. primary conductor). The user
shall ensure to take all measures necessary to protect against electrical shock. The transducer is a build-in device containing
conducting parts that shall not be accessible after installation. A protective enclosure or additional insulation barrier may
be necessary. Installation and maintenance shall be done with the main power supply disconnected except if there are no
hazardous live parts in or in close proximity to the system and if the applicable national regulations are fully observed.
Safe and trouble-free operation of this transducer can only be guaranteed if transport, storage and installation are carried out
correctly and operation and maintenance are carried out with care.
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SPLIT CORE CURRENT TRANSFORMER
ATO Series
Dimensions (in mm)
Connection
IP
Iout Vout
&
RL
Mechanical characteristics
●●
●●
●●
●●
General tolerance
Primary aperture
Fastening
Output cable length
±0.5 mm
⌀ 10 mm
Cable tie
1m
Remarks
●● Attention: contact areas (air gap) must be kept clean
(particle free) to ensure proper performance
●● 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:
Products/Product Documentation.
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LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
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SPLIT CORE CURRENT TRANSFORMER
ATO Series
DIN RAIL ADAPTOR (additional part option) dimensions (in mm)
Mechanical characteristics
●● General tolerance
●● Fastening
±0.4 mm
1.5 N·m
Remarks
●● Attention: contact areas (air gap) must be kept clean
(particle free) to ensure proper performance
●● 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:
Products/Product Documentation.
Page 18/18
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
LEM City answers the demand for an accurate, reliable and easy to install energy sensor for future Smart Cities.
www.lem.com
www.lemcity.com