Voltage transducer DVL 125
VPN = 125 V
For the electronic measurement of voltage: DC, AC, pulsed..., with galvanic isolation
between the primary and the secondary circuit.
Features
Applications
●● Bipolar and isolated measurement up to 188 V
●● Single or three phase inverter
●● Current output
●● Propulsion and braking chopper
●● Input and output connections with M5 studs
●● Propulsion converter
●● Compatible with AV 100 family.
●● Auxiliary converter
●● High power drives
Advantages
●● Substations.
●● Low consumption and low losses
●● Compact design
Standards
●● Good behavior under common mode variations
●● EN 50155: 2007
●● Excellent accuracy (offset, sensitivity, linearity)
●● EN 50178: 1997
●● Good response time
●● EN 50121-3-2: 2006
●● Low temperature drift
●● EN 50124-1: 2001
●● High immunity to external interferences.
●● Isolated plastic case material recognized
according to UL 94-VO.
Application Domain
●● Traction (fixed and onboard)
●● Industrial.
N° 97.H9.36.000.0
28January2013/Version 0
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DVL 125
Absolute maximum ratings
Parameter
Symbol
Value
±34 V
Maximum supply voltage (VP = 0, 0.1 s)
Maximum supply voltage (working) (-40 .. 85 °C)
±26.4 V
±VC
Maximum input voltage (-40 .. 85 °C)
188 V
Maximum steady state input voltage (-40 .. 85 °C)
125 V
see derating on figure 2
VPN
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.
Isolation characteristics
Parameter
Symbol
Unit
Min
Comment
Vd
kV
8.5
100 % tested in production
kV
16
RMS voltage for AC isolation test 50/60Hz/1 min
Maximum impulse test voltage (1.2/50 µs
exponential shape)
Isolation resistance
RIS
MΩ
200
Partial discharge extinction voltage rms @ 10 pC
Ve
V
2700
Comparative tracking index
CTI
V
600
Clearance and creepage
measured at 500 V DC
See dimensions drawing on page 8
Environmental and mechanical characteristics
Parameter
Symbol
Unit
Min
Ambient operating temperature
TA
°C
-40
85
Ambient storage temperature
TS
°C
-50
90
Mass
m
g
Typ
Max
300
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DVL 125
Electrical data DVL 125
At TA = 25°C, ±VC = ±24 V, RM = 100 Ω, unless otherwise noted.
Lines with a * in the conditions column apply over the -40 .. 85 °C ambient temperature range.
Parameter
Symbol
Unit
Primary nominal voltage, rms
VPN
V
Primary voltage, measuring range
VPM
V
Min
-188
0
RM
Ω
Secondary nominal current, rms
ISN
mA
Output range
IS
mA
-75
±VC
V
±13.5
Supply rise time (10-90%)
Max
125
Measuring resistance
Supply voltage
Typ
*
188
*
120
* See derating on figure 2.
For │VPM│< 188 V, max
value of RM is given
on figure 1
50
±24
ms
Conditions
*
75
*
±26.4
*
100
Current consumption @ VC = ±24 V
IC
mA
Offset current
IO
µA
-50
Offset drift
IOT
µA
-120
-150
Sensitivity
G
µA/V
Sensitivity error
εG
%
-0.2
Thermal drift of sensitivity
εGT
%
-0.5
0.5
*
Linearity error
εL
%
-0.5
0.5
* ±188 V range
Overall accuracy
XG
% of
VPN
-0.5
0.5
-1
1
20 + IS
25 + IS
0
50
100% tested in production
120
150
-25 .. 85 °C
-40 .. 85 °C
400
0
Output current noise, rms
ino
µArms
27
Reaction time @ 10 % of VPN
tra
µs
30
Response time @ 90 % of VPN
tr
µs
50
BW
kHz
14
8
2
ms
190
Frequency bandwidth
Start-up time
50 mA for 125 V
0.2
*
25°C; 100% tested in
production
-40 .. 85 °C
1 Hz to 100 kHz
60
0 to 125 V step, 6 kV/µs
-3 dB
-1 dB
-0.1 dB
250
*
Primary resistance
R1
MΩ
2.7
*
Total primary power loss @ VPN
P
mW
5.8
*
Min., Max., Typ. definition
Some parameters have a statistically normal distribution. The typical value published in the LEM datasheet is the mean or average
value of the distribution. The typical value listed is the 1 sigma value. This means that in 68 % of the devices tested, the parameters is found to be ± the typical value or better. LEM currently uses ± 3 sigma (99.73 %) to define minimum and maximum values.
Usually, typical values are set when the part is characterized and never changes.
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DVL 125
500
400
300
200
TA = -40 .. 85 °C
VC = ±13.5 to ±26.4 V
100
0
0
40
80
120
160
200
Minimum measuring resistance
(Ohm)
Maximum measuring resistance
(Ohm)
Typical performance characteristics
100
90
80
70
60
50
40
30
20
10
0
Vc = ±24 V
Vc = ±15 V
TA = -40 .. 85 °C
0
25
Measuring range (V)
Overall accuracy (%)
Electrical offset drift (uA)
50
-50
-150
-250
-50
-25
0
25
50
75
100
Figure 3: Electrical offset thermal drift
Sensitivity drift (%)
125
Max
Typical
Min
0.80
0.40
0.00
-0.40
-0.80
-1.20
-50
-25
0
25
50
75
100
Ambient temperature (°C)
Ambient temperature (°C)
0.8
100
Figure 2: Minimum measuring resistance;
For TA under 80°C, the minimum measuring
resistance is 0 Ω whatever VC
1.20
Max
Typical
Min
150
75
Nominal input voltage (V)
Figure 1: Maximum measuring resistance
250
50
Figure 4: Overall accuracy in temperature
Max
Mean
Min
0.6
0.4
0.2
0.0
-0.2
Input VP: 25 V/div
Output IS: 10 mA/div
Timebase: 20 µs/div
-0.4
-0.6
-0.8
-50
-25
0
25
50
75
100
Ambient temperature (°C)
Figure 5: Sensitivity thermal drift
Figure 6: Typical step response (0 to 125 V)
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DVL 125
Typical performance characteristics (continued)
35
TA = 25°C, VP = 0 V
0
5
10
15
20
25
30
30
Typical supply current (mA)
Typical supply current (mA)
45
40
35
30
25
20
15
10
5
0
25
20
15
10
Vc = 15 V
5
Vc = 24 V
0
-50
Supply voltage ( V)
25
50
75
100
Figure 8: Supply current function of temperature
10
180
0
120
Phase (deg)
-10
Gain (dB)
0
Ambient temperature (°C)
Figure 7: Supply current function of supply voltage
-20
-30
-40
60
0
-60
-120
-50
-60
0.01
-25
0.1
1
10
-180
0.01
100
0.1
1
10
100
Frequency (kHz)
Frequency (kHz)
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
-0.9
-1
0.01
Phase(deg)
Gain (dB)
Figure 9: Typical frequency and phase response
0.1
1
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
0.01
0.1
Frequency (kHz)
1
10
Frequency (kHz)
Figure 10: Typical frequency and phase response (detail)
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DVL 125
Typical performance charateristics (continued)
Input VP: 2 kV/div
Output IS: 500 µs/div
Timebase: 100 µs/div
Input VP: 2 kV/div
Output IS: 500 µA/div
Timebase: 20 µs/div
Figure 11: Typical common mode perturbation
(2000 V step with 6 kV/µs RM = 100 Ω)
Figure 12: Detail of typical common mode perturbation
(2000 V step with 6 kV/µs, RM = 100 Ω)
1E-4
-80
In (Arms)
Vn (dBVrms/rtHz)
-90
-100
-110
-120
-130
1E-5
1E-6
1E-7
-140
-150
0.001
0.01
0.1
1
10
100
1E-8
0.001
0.01
0.1
Figure 13: Typical noise voltage density of V (RM)
with RM = 50 Ω
Linearity error (% of 125 V)
10
100
Frequency (kHz)
Frequency (kHz)
0.06
Figure 14: Typical total output current noise (rms)
with RM = 50 Ω
(fc is upper cut-off frequency of bandpass,
low cut off frequency is 1 Hz)
Figure 13 (noise voltage density) shows that there are no significant
discrete frequencies in the output.
Figure 14 confirms the absence of steps in the total
output current noise that would indicate discrete frequencies.
To calculate the noise in a frequency band f1 to f2, the formula is
0.04
0.02
In(f1 to f2) = In(f2) − In(f1)
2
0.00
2
with In(f) read from figure 14 (typical, rms value).
-0.02
-0.04
-0.06
-190
1
-114
-38
38
114
Primary voltage (V)
190
Example:
What is the noise from 10 to 100 Hz?
Figure 14 gives In(10 Hz) = 0.3 µA and In(100 Hz) = 1.1 µA.
The output current noise (rms) is therefore
(1.1 ⋅10 ) − (0.3⋅10 ) = 1.05 µA
−6 2
−6
2
Figure 15: Typical linearity error at 25°C
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DVL 125
Performance parameters definition
The schematic used to measure all electrical parameters are:
+VC
+
+HV
VP
M
IS
RM
0V
-HV
-
-VC
Isolation
barrier
Figure 16:
standard characterization schematics for current
output transducers (RM = 50 Ω unless otherwise
noted)
Sensitivity and linearity
To measure sensitivity and linearity, the primary voltage (DC)
is cycled from 0 to VPM, then to -VPM and back to 0 (equally
spaced VPM/10 steps).
The sensitivity G is defined as the slope of the linear
regression line for a cycle between ± VPM.
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
Due to its working principle, this type of transducer has no
magnetic offset current IOM.
Transducer simplified model
Electrical offset
The static model of the transducer at temperature TA is:
IS = G VP + error
In which
error = IOE + IOT (TA) + εG G VP + εGT (TA) G VP + εL G VPM
The electrical offset current IOE is the residual output current
when the input voltage is zero.
The temperature variation IOT of the electrical offset current
IOE is the variation of the electrical offset from 25°C to the
considered temperature.
IS
: the secondary current (A)
G
: the sensitivity of the transducer (A/V)
VP
: the voltage to measure (V)
VPM
: the measuring range (V)
TA
: the ambient temperature (°C)
IOE
: the electrical offset current (A)
IOT(TA) : the temperature variation of IO at
temperature TA (A)
εG
: the sensitivity error at 25°C
εGT (TA) : the thermal drift of sensitivity at
temperature TA
εL
: the linearity error
Overall accuracy
The overall accuracy XG is the error at ±VPN, relative to the rated
value VPN.
It includes all errors mentionned above.
Response and reaction times
The response time tr and the reaction time tra are shown in the
next figure.
Both slightly depend on the primary voltage dV/dt. They are
measured at nominal voltage.
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:
error =
100 %
90 %
VP
∑ (error _ component) 2
Is
tr
10 %
tra
t
Figure 17: response time tr and reaction time tra
I
100 %
90 %
Ip
28January2013/Version 0
Is
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tr
10 %
tra
t
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DVL 125
Dimensions DVL 125 (in mm)
Connection
Mechanical characteristics
± 1 mm
2 holes ∅ 6.5 mm
2 M6 steel screws
Recommended fastening torque 4 Nm
●● Connection of primary
2 M5 threaded studs
Recommended fastening torque 2.2 Nm
●● Connection of secondary
3 M5 threaded studs
Recommended fastening torque 2.2 Nm
Safety
●● General tolerance
●● Transducer fastening
Caution, risk of electrical shock
Remarks
IS is positive when a positive voltage is applied on +HV.
The transducer is directly connected to the primary voltage.
The primary cables have to be routed together all the way.
The secondary cables also have to be routed together all the
way.
●● Installation of the transducer is to be done without primary or
secondary voltage present.
●●
●●
●●
●●
This transducer must be used in electric/electronic equipment
with respect to applicable standards and safety requirements
in accordance with the manufacturer’s operating instructions.
When operating the transducer, certain parts of the module
can carry hazardous voltage (eg. 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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