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HO10-P-SP33 Datasheet(PDF) 10 Page - LEM

Part No. HO10-P-SP33
Description  Current Transducer
Download  11 Pages
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Manufacturer  LEM [LEM]
Direct Link  http://www.lem.co.jp/HQ/en
Logo LEM - LEM

HO10-P-SP33 Datasheet(HTML) 10 Page - LEM

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12February2014/Version 1
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
www.lem.com
HO-P/SP33 SERIES
Figure 2: Current cycle used to measure magnetic and
electrical offset
(transducer supplied)
Electrical offset
The electrical offset V
OE can either be measured when
the ferro-magnetic parts of the transducer are:
● completely demagnetized, which is difficult to realize,
● or in a known magnetization state, like in the current
cycle shown in figure 2.
Using the current cycle shown in figure 18, the electrical
offset is:
Note: the transducer has to be demagnetized prior to
the application of the current cycle (for example with a
demagnetization tunnel).
Overall accuracy
The overall accuracy at 25 °C X
G is the error in the - IPN .. +
I
PN range, relative to the rated value IPN.
It includes:
● the electrical offset V
OE
● the sensitivity error ε
G
● the linearity error ε
L (to IPN) (%)
Response and reaction times
The response time t
r and the reaction time tra are shown in
figure 18.
Both depend on the primary current di/dt. They are measured
at nominal ampere-turns.
Figure 3: Response time t
r and reaction time tra
Ampere-turns and amperes
The transducer is sensitive to the primary current linkage Θ
P (also
called ampere-turns).
Θ
P = NP·IP (At)
Where N
P is the number of primary turn (depending on
the connection of the primary jumpers)
Caution: As most applications will use the transducer with only
one single primary turn (N
P = 1), much of this datasheet is
written in terms of primary current instead of current linkages.
However, the ampere-turns (At) unit is used to emphasis that
current linkages are intended and applicable.
Transducer simplified model
The static model of the transducer at temperature T
A is:
V
out = G·ΘP + overall error (mV)
In which error =
ε
G ·ΘP·G + εL··ΘP·G + TCG·(TA-25)·ΘP·G + V
OE + TCVOE·(TA-25) (mV)
With:
Θ
P = NP·IP
: primary current linkage (At)
Θ
P max
: max primary current linkage applied to the
transducer (A/t)
V
out
: output voltage (V)
T
A
: ambient operating temperature (°C)
V
OE
: electrical offset voltage (V)
TCV
OE
: temperature coefficient of V
OE (mV/K)
G
: sensitivity of the transducer (V/At)
TCG
: temperature coefficient of G (%/K)
ε
G
: sensitivity error (%)
ε
L
: linearity error for Θ
P (%)
This model is valid for primary ampere-turns Θ
P between -ΘP max
and +Θ
P max only.
Sensitivity and linearity
To measure sensitivity and linearity, the primary current (DC) is
cycled from 0 to I
P, then to -IP and back to 0 (equally spaced
I
P/10 steps). The sensitivity G is defined as the slope of the linear
regression line for a cycle between ± I
PN.
The linearity error ε
L is the maximum positive or negative
difference between the measured points and the linear regression
line, expressed in % of I
PN.
Magnetic offset
The magnetic offset voltage V
OM is the consequence of a current
on the primary side (“memory effect” of the transducer’s ferro-
magnetic parts). It is measured using the following primary
current cycle. V
OM depends on the current value IP1 (IP1> IPM).
Performance parameters definition
t
V
t
V
V
out
out
OM
2
)
(
)
(
2
1
=
P (DC)
-IP1
P1
0 A
t1
t
t
Ip(3)
t2
Ip(
3)
I
I
tra
V
tr
90 %
10 %
t
100 %
I
I
out
p
2
)
(
)
(
2
1
t
V
t
V
V
out
out
OE
+
=
)
25
(
)
(
)
(
C
...
T
...
T
...
OE
OE
OT
°
=


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