Current transducer ITC 4000-S/SP2

IP N = 4000 A

For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation
between the primary and the secondary circuit.

Features

Applications● Bipolar and insulated current measurement up to 6 kA

● Energy metering● Current output● Propulsion converter● Aperture for primary bus bar with secondary connections● Substations● Test and measurement.

on M5 studs● Footprint compatible with LT 4000 series.

Special featureStandards● EN 50155: 2017

● Serial number engraved on closure plate.

● EN 50124-1: 2017
● EN 50121-3-2: 2016

Advantages● EN 50463 series: 2017

● Exceptional accuracy (better than Class 0.5R)● Low consumption and losses● 1) IEC 61869-1: 2007
● 1) IEC 61869-2: 2012

● Good behavior under common mode variations● 1) IEC 61869-6: 2016.

● High bandwidth

Application Domains● Very low temperature drift● High immunity to external interference.

● Railway (fixed installations and onboard)● Industrial.

Note: 1) Performance standards: ITC 4000-S/SP2 only partially fulfills these standards as this flux-gate transducer has
fundamental difference compared to current transformers.
N° 97.H4.74.002.0
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ITC 4000-S/SP2
Absolute maximum ratings
Parameter

SymbolValue

Maximum supply voltage (IP = 0 A, 0.1 s)±ÛC max±34 V

Maximum supply voltage (working) (−40 ... 85 °C)±UC max±26.4 V

Maximum primary current

IP max

100 kA

Maximum steady state primary current (−40 ... 85 °C)

IP N max

4000 A

Maximum steady state test winding current (−40 ... 85 °C)

IT max

1A

Maximum /VALID output current

0.1 A

Maximum /VALID output voltage

same limits as supply voltage

Absolute maximum ratings apply at 25 °C unless otherwise noted. Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum ratings for extended periods may degrade reliability.

Insulation coordination
Parameter

Symbol

Unit

Value

Comment

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

Ud

kV

14

100 % tested in production

Impulse withstand voltage (1.2/50 µs exponential shape)

UNi

kV

30

Partial discharge RMS test voltage (qm < 10 pC)

Ut

V

5000

Insulation resistance

RINS

MΩ

200

measured at 500 V DC

Clearance (pri. - sec.)

dCI

mm

Shortest distance throughair

Creepage distance (pri. - sec.)

dCp

mm

See
dimensions
drawing on
page 13

Case material

-

-

V0

Comparative tracking index

CTI

bar with centered bar⌀ 95 mm

Shortest path along device
body
According to UL 94

600

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ITC 4000-S/SP2
Environmental and mechanical characteristics
Parameter

SymbolUnit

Min

Ambient operating temperature

TA

°C

−40

85

Ambient storage temperature

TA st

°C

−50

85

Primary conductor temperature

TB

°C

Typ

Max

Comment

85

Equipment operating temperature class

EN 50155: OT6

Switch-on extended operating temperature class

EN 50155: ST0

Rapid temperature variation class

EN 50155: H2

Conformal coating type

EN 50155: PC2
RH

Relative humidity%

95

Shock & vibration categorie and class

EN 50155: 1B, (EN 61373)
m

Mass

kg

8.6

Ingress protection rating

IP40

Pollution degree

IEC 60529 (Indoor use)
PD4

Altitudem

Insulation voltage
accordingly

2000 1)

Note: 1) Insulation coordination at 2000 m.

RAMS data
Parameter

Symbol

Unit

Min

Typ

Max

Comment

Useful life class

EN 50155: L4Mean failure rate

According to IEC 62380
TA = 45 °C
ON: 20 hrs/day
ON/OFF: 320 cycles/year
UC = ±24 V, IP = 4000 V

λh-1

1/894946

Class accuracy
Parameter

Accuracy classComment

Class accuracy for a rated primary current IP N= 4000 A

0.5R

according EN 50463-2

Class accuracy for a rated primary current IP N= 3000 A

0.5R

according EN 50463-2

Class accuracy for a rated primary current IP N= 2000 A

0.5R

according EN 50463-2

Class accuracy for a rated primary current IP N= 1500 A

0.5R

according EN 50463-2

If used for energy measurement according to EN 50463, please note that the re-verification period of the transducer may besubject to national or international legal requirements. Recommended re-verification period is at least 8 years.

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Electrical data

ITC 4000-S/SP2

At TA = 25 °C, ±UC = ±24 V, RM = 0.1 Ω, unless otherwise noted (see Min, Max, typ. definition paragraph in page 5).
Lines with a * in the conditions column apply over the −40 ... 85 °C ambient temperature range.
Parameter

SymbolUnit

Primary nominal RMS current

IP N

A

Primary current, measuring range

IP M

A

Measuring resistanceRMΩSecondary nominal RMS current

IS N

A

Min

Typ

Max

Conditions

4000

*

−6000

6000

*

0

1
1.6

Secondary current

IS

A

−2.4

Supply voltage

±UC

V

±21.6

Rise time of UC (10-90 %)

trise

ms

Current consumption

IC

mA

45

±24

57

*

For I IP M I < 6 kA,
max value of RM is given in figure 1

*

2.4

*

±26.4

*

100

*

70

IP = 0 A, ±UC = ±24 V, valid for + and − supplies

Inrush current

NA (EN 50155)

Interruptions on power supply voltage
class

NA (EN 50155)

Supply change-over classNA (EN 50155)

Offset current,
referred to primary

IO

A

Magnetic offset current,
referred to primary

IO M

A

Temperature variation of IO,
referred to primary

IO T

A

Sensitivity

S

mA/A

Sensitivity error

εS

%

−0.05

−0.0002

0.05

Temperature variation of sensitivity error

εS T

%

−0.01

0.00050.01*

Linearity errorεL% of IP M

*

−0.05

0.003

0.05

23 °C; 100 % tested in production

0.005
−0.25

−0.003After IP = 15 kA
0.25−40 ... 85 °C;100 % tested in production

0.4

−0.01

0.00040.01−0.005−0.003+0.005−0.05−0.003+0.05−40 ... 85 °C±IP M range
23 °C; 100 % tested in production

Total error at IP N

εtot

% of IP N

Total error at 10 % of IP N

εtot

% of
reading−0.2−0.0030.2

23 °C; 100 % tested in production

Total error at 5 % of IP N

εtot

% of
reading−0.4−0.0050.4

23 °C; 100 % tested in production

Total error at 1 % of IP N

εtot

% of
reading

−2

−0.03

2

23 °C; 100 % tested in production

Total error at 0.4 % of IP N

εtot

% of
reading

−5

−0.08

5

23 °C

Total error from IP N DC = −10 A up to +10 A

εtot

A

−1

1

TA = −25 °C ... 50 °C, IP N AC = IP N, max. 100 Hz

RMS noise current referred to primary

Ino

A

3.2

1 Hz to 1 MHz

Delay time @ 10 % of the final output
value IP N step

tD 10

µs

0.1

0 to 4 kA, 100 A/µs

Delay time @ 90 % of the final output
value IP N step

tD 90

µs

0.1

0 to 4 kA, 100 A/µs

Frequency bandwidth

BW

kHz

82
45
11

3 dB, 100 A
1 dB, 100 A
0.1 dB, 100 A

Start-up time

tstartms

Number of secondary turns

NS

2500

Number of turns (test winding)

NT

400

400

500

*

−40 ... 85 °C*

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ITC 4000-S/SP2
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 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 toan interval between −sigma and +sigma for a normal distribution.
Typical, maximal and minimal values are determined during the initial characterization of the product.

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ITC 4000-S/SP2

εtot

RM

Typical performance characteristics

εtot

Figure 3: T otal error in temperature for0.05 IP N ≤ IP < 0.1 IP N

Figure 4: T otal error in temperature for0.01 IP N ≤ IP < 0.05 IP N

IO T

εS T

εtot

Figure 2: T otal error in temperature for
Figure 1: M aximum measuring resistance			
0.1 IP N ≤ IP ≤ 1.5 IP N
(TA = −40 ... 85 °C)

Figure 5: T ypical offset variation in temperature(9 samples shown)

Figure 6: T ypical temperature variation of sensitivity error(9 samples shown)
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ITC 4000-S/SP2
Typical performance characteristics

Figure 8: T ypical supply current function of primary current(RM = 0.1 Ω, ±UC = ±24 V)(both supply currents are identical)

Sensitivity

Figure 7: T ypical supply current function of supply voltage(IP = 0 A)

Sensitivity

Figures 9, 10: Typical frequency response, IP = 100 A RMS
Filtered output was measured with a 10 kHz 1st order low pass filter

Figures 11, 12: Typical frequency response (detail), IP = 100 A RMS
Filtered output was measured with a 10 kHz 1st order low pass filter
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ITC 4000-S/SP2

Figure 14: 100 kA overload behavior

Ino

no

Figure 13: Typical delay time (0 to 4 kA, 100 A/µs)

uno u(dB V RMS/Hz 1/2)

Typical performance characteristics

fc

fc (Hz)Figure 15: T ypical noise voltage spectral density
referred to primary uno
with RM = 1 ΩFigure 16: T ypical total RMS noise current referred toprimary Ino, with RM = 1 Ω(fc is upper cut off frequency of bandpass, low
cut off frequency is 1 Hz).
Filtered output was measured with 10 kHz
1st order low pass filter.
Figure 15 (noise voltage spectral density) shows that there
are two discrete frequencies in the output.

IP M

Figure 16 confirms that because there are steps in the total
output current noise at around 6 and 200 kHz.
The 10 kHz filter reduces by a large amount the highfrequency noise.
To calculate the noise in a frequency band f1 to f2, the formulais:εL

I no(f1 to f2 ) =I no(f2 ) − I no( f1 )2

2

with Ino(f) read from figure 16 (typical, RMS value).

Example:What is the noise from 10 to 1000 Hz?
Figure 16 gives Ino(10 Hz) = 4 mA and Ino(1000 Hz) = 6.5 mA.

The output current noise (RMS) is therefore.
Figure 17:Typical linearity error

-3 2

-3 2

(6.5 ⋅ 10 ) − (4 ⋅10 ) −− 5.1 mA referred to primary
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In(f1 to f2) = In(f2) − In(f1)2

2

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ITC 4000-S/SP2
Typical performance characteristics

Figure 18: Typical common mode perturbation unfilteredoutput (5 kV step with 1 kV/µs, RM = 1 Ω)

Figure 19: T ypical common mode perturbation
with 10 kHz 1st order low pass filteron the output(5 kV step with 1 kV/µs, RM = 1 Ω)Page 9/13
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ITC 4000-S/SP2
General description

The ITC 4000 transducer is a closed loop current transducer
based on the fluxgate principle for the insulated yet accurate
measurement of currents up to 6 kA.
Its Class D power stage greatly reduces the power consumption
compared to standard designs and allows function without
limitation with an ambient temperature from −40 ... 85 °C.

primary
conductor

magnetic
core

Closed loop transducer
The ITC is a compensated current transducer (also called
closed loop): it means that the current in the secondary coil
is regulated so that the magnetic flux it creates in the main
toroidal core compensates exactly the flux generated by the
primary current.
This implies that the magnetic potential (ampere-turns) of thetwo coils are identical, hence:
NP⋅IP = NS⋅IS or IS= IP⋅NP/NS also written IS = S⋅IP with
−NP and NS the turns numbers of the primary andcompensation (or secondary) windings,-S = NP/NS the sensitivity of the transducer
Consequently, the secondary current IS is the exact image ofthe primary current IP being measured.
Inserting a measuring resistor RM in series with thecompensation coil (see figure 20) creates an output voltagethat is an exact image of the measured current from DC to highfrequencies.
flux
detector

regulator
andamplifierIT

IP

compensation
winding

fluxgates

Figure 21: ITC head construction

Output stage
The output stage of the ITC uses a Class D amplifier to limit
both the power consumption of the transducer and its losses.
In this type of switched-mode amplifier both transistors of theoutput bridge are turned on and off alternatively by a PWM
signal as shown in figure 22 and 23. The losses are therefore
only caused by the Rds (on) and the turn-on and -off lossesof the transistors T1H and T1L. Compared to the industry
standard, which is the Class AB (linear), the Class D allows
the losses in the transistors to be reduced by a factor close
to 10, removing the need for large heatsinks and improving
the reliability of the electronics. A built-in second order filter
attenuates the harmonics to a very low level.
The ITC moreover uses a proprietary technique to balance
the supply currents which results in reduced and almost equal
supply currents drawn from both supplies whatever the input
current measured (I_H and I_L in figure 22). See also figure 8.

NT

+Uc

I_H

I_T1H

+

IS

RM

NP = 1T1H

Power
suppliesbalancing
circuit

0V

0V

IP

+

Class D
power
stage

Compensation
winding

IS

T1L

RM
I_T1L

Figure 20: Principle of ITC transducer

Fluxgate

-Uc

0V

I_L

Figure 22: Power stage principle

A fluxgate detector measures the resulting magnetic flux.
It uses an inductor, the fluxgate, composed of a thin toroid witha coil around it and placed in the center of the main core halves(see figure 21).
The electronics saturate the fluxgate in both directions andanalyzes the symmetry of the fluxgate’s saturation currents to
extract the actual flux value.
The fluxgate detector developed for the ITC is very stable intemperature, which gives the ITC its outstanding accuracy
stability.
Figure 23: Current in transistors

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Overload behavior and /VALID output

General description

ITC 4000-S/SP2

The electronics cannot maintain the flux compensation if the
primary current becomes higher than the measuring range.
If this state lasts too long the fluxgate detector becomescompletely saturated and unable to measure the flux error.
When this happens, the transducer stops for 300 to 500 ms
and then sweeps the output current to find the point at which
compensation is correct again and the normal function canresume. This behavior is shown in figure 24.
overloadIP
IP M
regulation unable
to maintainsecondary current

IS

time

start of
sweep

IS M

time

/VALIDPower stage
disabled

Regulation
working normallytime

Figure 24: Overload behavior
The logic output /VALID is an open collector. The pull-up
resistor Rpu is external to the transducer (see figure 25). It is
activated (pulled to 0 V) to indicate that the regulation of theoutput current works normally. It is deactivated (pulled to thehigh level) to indicate that the output current is not the exact
image of the primary current. It happens during the start-up of
the transducer, after a large overcurrent, if there is an internalfault or if the measuring resistance is disconnected while a
primary current is present.
The transducer is protected against overloads up to 100 kA
without duration limit. In such a case, it will stop to protect
itself and /VALID will be deactivated. Even if the compensation
winding current is very high thanks to the transformer effect,
there is no high current drawn from the supplies or reinjected in
the supplies. For very low measuring resistances values, there
might be a current close to IP·S in the measuring resistance
until the core saturates (typically 15 ms for 100 kA).

Test winding
A test winding is wound around the compensation winding.
It allows simulating a primary current to test the function andaccuracy of the transducer at 10 % of its nominal. The output
current IS for a test current IT is IS = NT/NS⋅IT.
The current injected in the test winding must be generated by acurrent source (high impedance).
When the test winding is not used, it must stay opened.

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ITC 4000-S/SP2
Performance parameters definition
The schematic used to measure all electrical parameters are:
IT

IP

IS

Rpu

IS

RM

UC

UC

Figure 25: Standard characterization schematics for
current output transducers

Transducer simplified model
The static model of the transducer at temperature TA is:
IS = S⋅IP + ε
In which
ε = IO E+ IO T (TA) + εS⋅S⋅IP + εS T (TA)⋅S⋅IP + εL⋅S⋅IP M + IO M
IS
S
IP
IP M
TA
IO E
IO M
IO T (TA)		εSεS T (TA)εL: secondary current (A): sensitivity of the transducer (A/A): primary current (A): primary current, measuring range (A): ambient operating temperature (°C): electrical offset current (A): magnetic offset current (A): temperature variation of IO at
temperature TA (A): sensitivity error at 25 °C: temperature variation of sensitivity error: linearity error

This is the absolute maximum error. As all errors are
independent, a more realistic way to calculate the error would
be to use the following formula:ε=∑ (error _ component)

2

Sensitivity and linearity
To measure sensitivity and linearity, the primary current (DC) is
cycled from 0 to IP M, then to -IP M and back to 0 (equally spaced
IP M/10 steps).
The sensitivity S is defined as the slope of the linear regression
line for a cycle between ±IP M.
The linearity error εL is the maximum positive or negative
difference between the measured points and the linear
regression line, expressed in % of the maximum measured
value.

Magnetic offset
The magnetic offset IO M is the change of offset after a given
current has been applied to the input. It is included in the linearity
error as long as the transducer remains in its measuring range.
Due to its working principle, this type of transducer has small
magnetic offset current.

Electrical offset
The electrical offset current IO E is the residual output current
when the input current is zero (magnetic offset removed).
The temperature variation IO T of the electrical offset current
IO E is the variation of the electrical offset from 25 °C to theconsidered temperature.

Total error
The total error εtot is the error at a given current (IP N if notmentioned), relative to the rated value IP N or to the reading.
It includes all errors mentioned above.

Delay times
The delay time tD 10 and the delay time tD 90 are shown in thenext figure.
Both slightly depend on the primary current di/dt.
They are measured at nominal current.
I
100 %
90 %

IS

IP
tD 90
10 %

tD 10

t

Figure 26: tD 10 (delay time to 10 %) and tD 90 (delay time to 90 %)Page 12/13
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ITC 4000-S/SP2
Dimensions (in mm)

dCp

dCI

Connection
IT

IP

IS

Rpu

IS

RM

Recommended fastening torque● Connection of secondary
Recommended fastening torqueUC

SafetyMechanical characteristics● General tolerance● Transducer fastening

UC

±1 mm
4 slots 11 mm
4 M10 steel screws
11.5 N⋅m (±10 %)M5 inserts
2.2 N⋅m (±10 %)This transducer must be used in electric/electronic equipmentwith respect to applicable standards and safety requirements inaccordance with the manufacturer’s operating instructions.

Remarks● IS is positive when IP flows in the direction of arrow.
● The secondary cables also have to be routed together all
the way.
● Installation of the transducer is to be done without primaryor secondary voltage present.
● Installation of the transducer must be done unlessotherwise 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.
Note: Additional information available on request.

Caution, risk of electrical shock
When operating the transducer, certain parts of the module cancarry hazardous voltage (e.g. primary busbar, power supply).
Ignoring this warning can lead to injury and/or cause serious
damage. This transducer is a build-in device, whose conducting
parts must be inaccessible after installation. A protective
housing or additional shield could be used. Main supply must
be able to be disconnected.

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