LF 205-P

## **Current Transducer LF 205-P** 

## **I = 200 A** PN 

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

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## **Features** 

## ~~**Electrical data**~~ 

|**I**PN|Primary nominal current rms||||200|||A|
|---|---|---|---|---|---|---|---|---|
|**I**PM|Primary current, measuring range|Primary current, measuring range|||0 .. ± 420|||A|
|**R**M|Measuring resistance @||**T**A = 70°C||= 70°C**T**A = 85°C||||
||||**R**M min**R**M max**R**M min**R**M max||||||
||with ± 12 V<br>@ ± 200 Amax||0|71<br>0||0|69|Ω|
||@ ± 420 Amax||0|14<br>0||0|12|Ω|
||with ± 15 V<br>@ ± 200 Amax||0|100<br>23|||23<br>98|Ω|
||@ ± 420 Amax||0|28<br>23|||23<br>26|Ω|
|**I**SN|Secondary nominal current rms|Secondary nominal current rms|||100|||mA|
|**K**N|Conversion ratio||||1 : 2000||||
|**V**C|Supply voltage (+ 5 %)||||± 12 .. 15|± 12 .. 15||V|
|**I**C|Current consumption @ ± 15 V||||17+**I**S|||mA|
|~~**Accuracy - Dynamic performance data**~~|||~~**Accuracy - Dynamic performance data**~~||||||
|**X**G|Overall accuracy @**I**PN,**T**A= 25°C||||± 0.5|± 0.5|± 0.5|%|
|εL|Linearity error||||< 0.1|< 0.1|< 0.1|%|
||||||Typ||Max||
|**I**O<br>**I**OM|Offset current @**I**P= 0,**T**A= 25°C<br>Magnetic offset current1)@**I**P= 0 and specified|= 25°C<br>= 0 and specified**R**M,|||||± 0.2|mA|
||after an overload of 3 x**I**PN||||||± 0.1|mA|
|**I**OT|Temperature variation of**I**O|- 40°C .. + 85°C||- 40°C .. + 85°C|± 0.12 ± 0.4|± 0.12 ± 0.4|± 0.12 ± 0.4|mA|
|**t**ra|Reaction time to 10 % of**I**PNstep|step|||< 500|< 500|< 500|ns|
|**t**r|Response time2)to 90 % of**I**PNstep||||< 1|||µs|
|**di/dt**|di/dt accurately followed||||> 100|> 100|> 100|A/µs|
|**BW**|Frequency bandwidth (- 3 dB)||||DC .. 100|||kHz|
|~~**General data**~~|||||||||
|**T**A|Ambient operating temperature||||- 40 .. + 85|||°C|
|**T**S|Ambient storage temperature||||- 40 .. + 90|||°C|
|**R**S|Secondary coil resistance|@**T**A= 70°C|||33|||Ω|
|||@**T**A= 85°C|||35|||Ω|
|**_m_**|Mass||||58|||g|
||Standards||||EN 50178: 1997||||



- ●Closed loop (compensated) current transducer using the Hall effect 

- ●Isolated plastic case recognized according to UL 94-V0. 

## **Advantages** 

- ●Excellent accuracy 

- ●Very good linearity 

- ●Low temperature drift 

- ●Optimized response time 

- ●Wide frequency bandwidth 

- ●No insertion losses 

- ●High immunity to external interference 

- ●Current overload capability. 

## **Applications** 

- ●AC variable speed drives and servo motor drives 

- ●Static converters for DC motor drives 

- ●Battery supplied applications 

- ●Uninterruptible Power Supplies (UPS) 

- ●Switched Mode Power Supplies (SMPS) 

- ●Power supplies for welding applications. 

## **Application domain** 

- ●Industrial. 

Notes: 1) As a result of the coercive force of the magnetic circuit 

- [2)] With a di/dt of 100 A/µs. 

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

31October2011/version 5 

## **Current Transducer LF 205-P** 

|~~**Isolation characteristics**~~|~~**Isolation characteristics**~~|||
|---|---|---|---|
|**V**d|Rms voltage for AC insulation test, 50/60 Hz, 1 min|3.5|kV|
|**V**w|Impulse withstand voltage 1.2/50 µs|8.8|kV|
|**V**e|Partial discharge extinction voltage rms @ 10 pC|> 2|kV|
|||Min||
|**dCp**|Creepage distance|9.5|mm|
|**dCI**|Clearance|9.5|mm|
|**CTI**|Comparative Tracking Index (group IIIa)|175||



## **Applications examples** 

**According to EN 50178 and IEC 61010-1 standards** and following conditions: 

- ●Over voltage category OV 3 

- ●Pollution degree PD2 

- ●Non-uniform field 

|●Pollution degree PD2<br>●Non-uniform feld|||
|---|---|---|
||**EN 50178**|**IEC 61010-1**|
|**dCp, dCI,**<br>**V**w|Rated insulation voltage|Nominal voltage|
|Basic insulation|800 V|800 V|
|Reinforced insulation|400 V|300 V|



## **Safety** 

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. 

Caution, risk of electrical shock 

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

31October2011/version 5 

www.lem.com 

## **Dimensions LF 205-P** (in mm) 

Connection 

**==> picture [162 x 63] intentionally omitted <==**

## **Mechanical characteristics** 

- ●General tolerance 

●General tolerance ± 0.2 mm ●Secondary connection 3 pins 0.63 x 0.56 mm Recommended PCB hole Ø 0.9 mm ●Primary through-hole Ø 15.5 mm ●Supplementary fastening 2 holes Ø 1.75 mm Recommended PCB hole Ø 2.4 mm Recommended screws KA22 x 6 

## **Remarks** 

- **I** S is positive when **I** P flows in the direction of the arrow. 

- ●Temperature of the primary conductor should not exceed 100°C. 

- ●Dynamic performances (di/dt and response time) are best with a single bar completely filling the primary hole. 

- ●This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us. 

Page 3/3 

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

31October2011/version 5 

www.lem.com