LF 205-S/SP3

## **Current Transducer LF 205-S/SP3** 

## _I_ **= 100 A** P N 

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

## **Features** 

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

|_I_P N|Primary nominal RMS current||||100|||A|
|---|---|---|---|---|---|---|---|---|
|_I_P M|Primary current, measuring range||||0 ... ±200|||A|
|_R_M|Measuring resistance @||_T_A = 70 °C_T_A = 85||||°C||
||||_R_M min|_R_M max_R_M min_R_M max|||||
||with ±12 V<br>@ ±100 Amax||0|95<br>15|||94|Ω|
||@ ±200 Amax||0|40<br>15|||39|Ω|
||with ±15 V<br>@ ±100 Amax||16|123<br>47|||122|Ω|
||@ ±200 Amax||16|55<br>47|||54|Ω|
|_I_S N|Secondary nominal RMS current||||100|||mA|
|_N_P/_N_S|Turns ratio||||1 : 1000||||
|_U_C|Supply voltage (+5 %)||||±12 ...|15||V|
|_I_C|Current consumption @ ±15 V||||17+_I_S|||mA|
|~~**Accuracy - Dynamic performance**~~|||~~**data**~~||||||
|_ε_tot|Total error @_I_P N,_T_A= 25 °C||||±0.5|||%|
|_ε_L|Linearity error||||< 0.1|||%|
||||||Typ|Max|||
|_I_O<br>_I_O M|Ofset current @_I_P= 0,_T_A= 25 °C<br>Magnetic ofset current1)@_I_P= 0 and specifed|||_R_M,||±0.2||mA|
||after an overload of 3 ×_I_P N|||||±0.1||mA|
|_I_O_T_|Temperature variation of_I_O|−40 °C ... +85||°C|±0.25|±0.65||mA|
|_t_D 10|Delay time to 10 % of the fnal output value for_I_P Nstep < 500|||||||ns|
|_t_D 90|Delay time2)to 90 % of the fnal output||value for|_I_P Nstep < 1||||µs|
|_BW_|Frequency bandwidth (−3 dB)||||DC ... 100|||kHz|
|~~**General data**~~|||||||||
|_T_A|Ambient operating temperature||||−40 ...|+85||°C|
|_T_A st|Ambient storage temperature||||−40 ...|+90||°C|
|_R_S|Resistance of secondary winding|@_T_A|= 70 °C||10|||Ω|
|||@_T_A|= 85 °C||11|||Ω|
|_m_|Mass||||78|||g|
||Standards||||EN 50178:||1997||



Notes: 1) The result of the coercive force of the magnetic circuit 

> 2) For a d _i_ /d _t_ = 100 A/µs. 

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

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

## **Special features** 

- _I_ P N = 100 A 

- _I_ P M = 0 ... ±200 A 

- _N_ P/ _N_ S = 1 : 1000. 

## **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. 

Page 1/3 LEM International SA Chemin des Aulx 8 1228 PLAN-LES-OUATES Switzerland www.lem.com 

Nº 97.14.44.003.0 

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

1April2021/version 12 

## **Current Transducer LF 205-S/SP3** 

||~~**Insulation coordination**~~|||
|---|---|---|---|
|_U_d|RMS voltage for AC insulation test, 50/60 Hz, 1 min|3.5|kV|
|_U_Ni|Impulse withstand voltage 1.2/50 µs|8.8|kV|
|_U_e|Partial discharge extinction RMS voltage @ 10 pC|> 2|kV|
|||Min||
|_d_Cp|Creepage distance|11|mm|
|_d_CI|Clearance|10.2|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 

||**EN 50178**|**IEC 61010-1**|
|---|---|---|
|_d_Cp,_d_CI,_U_Ni|Rated insulation voltage|Nominal voltage|
|Basic insulation|500 V|500 V|
|Reinforced insulation|250 V|250 V|



## **Safety** 

This transducer must be used in limited-energy secondary circuits according to IEC 61010-1. 

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. 

Page 2/3 LEM reserves the right to carry out modifications on its transducers, LEM International SA in order to improve them, without prior notice Chemin des Aulx 8 1228 PLAN-LES-OUATES Switzerland www.lem.com 

1April2021/version 12 

**Dimensions LF 205-S/SP3** (in mm) 

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## **Mechanical characteristics** 

●General tolerance ±0.2 mm ●Transducer fastening Vertical position 2 holes ⌀ 4.3 mm 2 steel screws M4 Recommended fastening torque 1.5 N·m Or 4 holes ⌀ 2.0 mm depth: 7 mm 4 screws PTKA 25 length: 6 mm ●Transducer fastening Horizontal position 4 holes ⌀ 4.3 mm 4 steel screws M4 Recommended fastening torque 1.5 N·m Or 4 holes ⌀ 2.0 mm 4 screws PTKA 25 min length: 11.5 mm with thickness of fixed plate Recommended fastening torque 0.7 N·m ●Primary through-hole ⌀ 15.5 mm ●Connection of secondary Molex 6410 3 Tin plated pins 

## **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. 

- ●Installation of the transducer must be done unless otherwise 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/.** 

- ●Dynamic performances ( d _i_ /d _t_ and delay time) are best with a single bar completely filling the primary hole. 

Page 3/3 

1April2021/version 12 LEM reserves the right to carry out modifications on its transducers, LEM International SA in order to improve them, without prior notice Chemin des Aulx 8 1228 PLAN-LES-OUATES Switzerland www.lem.com