LAX100-NP View Datasheet(PDF) - LEM Industrial

Part Name

Description

View to exact match

LAX100-NP

Current Transducer

LEM Industrial 

LAX series 16-100 A

Performance parameters definition (continued)

Electrical offset

Response and reaction times

The electrical offset current IOE 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 above.

Using the current cycle shown in figure 18, the electrical

offset is:

IOE

=

Is(t1 ) + Is(t2 )

2

The temperature variation I of the electrical offset current

OT

IOE is the variation of the electrical offset from 25°C to the

considered temperature:

IOT (T ) = IOE (T ) − IOE (25°C)

Note: the transducer has to be demagnetized prior to the

application of the current cycle (for example with a

demagnetization tunnel).

The response time tr and the reaction time tra are shown in the

next figure.

Both depend on the primary current di/dt. They are measured at

nominal ampere-turns.

The "di/dt accurately followed" mentionned in the electrical data

table is defined as the di/dt of the primary current for which the

response time is equal to 1 µs.

I

100 %

90 %

Ip

10 %

Is

tr

tra

t

Figure 19: response time tr and reaction time tra

Overall accuracy

The overall accuracy at 25°C XG is the error in the - IPN .. + IPN

range, relative to the rated value I .

PN

It includes:

•

the

electrical

offset

I

OE

• the sensitivity error εG

•

the

linearity

error

εL (to

I)

PN

The magnetic offset is part of the overall accuracy. It is

taken into account in the linearity error figure provided the

transducer has not been magnetized by a current higher

than IPN.

070213/7

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.

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