LDSR 0.3-NP

**Current Transducer LDSR 0.3-NP** 

## _I_ **= 300 mA** P R N 

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

## **Features** 

- ●Closed loop (compensated) current transducer 

- ●Voltage output 

- ●Single supply voltage 

- ●PCB mounting. 

## **Applications** 

- ●Leakage current measurement in transformerless PV inverters 

- ●3 phases plus neutral 

- ●First human contact protection of PV arrays 

- ●Failure detection in power sources 

## **Special feature** 

- ●Dedicated primary PCB. 

## **Advantages** 

- ●Very low offset drift temperature coefficient 

- ●High overload capability 

- ●High insulation capability 

- ●Reference pin with two modes, Ref IN and Ref OUT 

- ●Test winding. 

- ●Symmetrical fault detection 

- ●Current leakage detection in stacked DC sources 

- ●Nominal current per phase measurement up to ±30 A per wire (DC or AC). 

## **Standards** 

- ●EN 61800-1: 1997 

- ●EN 61800-2: 2015 

- ●EN 61800-3: 2004 

- ●UL 62109-1: 2010 

- ●IEC 61010-1: 2010 

- ●UL 508. 

## **Application Domain** 

- ●Industrial. 

N° 97.S9.A2.000.0 

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**LDSR 0.3-NP** 

## **Absolute maximum ratings** 

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Parameter Symbol Unit Value<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Value**|
|---|---|---|---|
|||||
|Maximum supply voltage|_U_C max|V|7|
|Maximum primary conductor temperature|_T_B max|°C|110|
|Overload capability|_Î_P||3300|



Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade reliability. 

## **UL 508: Ratings and assumptions of certification** 

File # E189713 Volume: 2 Section: 11 

## **Standards** 

- ●CSA C22.2 NO. 14-10 INDUSTRIAL CONTROL EQUIPMENT - Date 2011/08/01 

- ●UL 508 STANDARD FOR INDUSTRIAL CONTROL EQUIPMENT - Date 2013 

## **Ratings** 

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Parameter Symbol Unit Value<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Value**|
|---|---|---|---|
|||||
|Primary involved potential||V RMS|300|
|Max surrounding air temperature|_T_A|°C|105|
|Primary current|_I_P|A|30|
|Secondary supply voltage|_U_C|V DC|5|
|Output voltage|_U_out|V|0 to 5|



## **Conditions of acceptability** 

When installed in the end-use equipment, consideration shall be given to the following: 

- _1 - These devices must be mounted in a suitable end-use enclosure._ 

- _2 -  The terminals have not been evaluated for field wiring._ 

- _3 - The LDSR xx-NP Series shall be used in a pollution degree 2 environment or better._ 

- _4 -  Low voltage circuits are intended to be powered by a circuit derived from an isolating source and having no direct connection back to the primary circuit._ 

- _5 -  These devices are intended to be mounted on the printed wiring board of the end-use equipment (with a minimum CTI of 100)._ 

- _6 -  LDSR xx-NP Series: based on results of temperature tests, in the end-use application, a maximum of 110°C cannot be exceeded on the primary jumper._ 

## **Marking** 

Only those products bearing the UL or UR Mark should be considered to be Listed or Recognized and covered under UL’s FollowUp Service. Always look for the Mark on the product. 

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**LDSR 0.3-NP** 

## **Insulation coordination** 

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Parameter Symbol Unit Value Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Value**|**Comment**|
|---|---|---|---|---|
||||||
|RMS voltage for AC insulation test, 50 Hz, 1 min|_U_d|kV|1.71|According to 62109-1|
|Impulse withstand voltage 1.2/50 μs|_U_Ni|kV|4||
|Partial discharge extinction RMS voltage @ 10 pC|_U_e|V|990||
|Clearance (pri. - sec.)|_d_CI|mm|See outline drawing in page 10||
|Creepage distance (pri. - sec.)|_d_Cp||||
|Case material|-|-|V0|according to UL 94|
|Comparative tracking index|_CTI_||600||



## **Environmental and mechanical characteristics** 

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Parameter Symbol Unit Min Typ Max Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
||||||||
|Ambient operating temperature|_T_A|°C|−40||105||
|Ambient storage temperature|_T_S|°C|−50||105||
|Mass|_m_|g||38|||



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**LDSR 0.3-NP** 

## **Electrical data** 

At _T_ A = 25 °C, _U_ C = +5 V, unless otherwise noted. (See Min, Max, typ. definition paragraph in page 7). Lines with * in the condition column apply over the ambient temperature range. 

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Parameter Symbol Unit Min Typ Max * Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|*****|**Comment**|
|---|---|---|---|---|---|---|---|
|||||||||
|Primary nominal residual RMS<br>current|_I_P R N|mA||300||*||
|Primary residual current,<br>measuring range|_I_P R M|mA|−900||900|*||
|Supply voltage|_U_C|V|4.75|5|5.25|*||
|Current consumption|_I_C|mA||18|20.5||+_I_P(mA)/_N_S<br>with_N_S= 40 turns|
|Internal voltage reference|_U_I ref|V|2.485|2.5|2.515|||
|Internal voltage source current<br>reference|_I_I ref|µA|||400|||
|External voltage reference|_U_E ref|V|2.25||2.75|||
|Current to force a voltage external<br>reference|-|mA|||1.5|||
|Electrical offset current referred to<br>primary|_I_O E|mA|−40||40|||
|Temperature coeffcient of_I_O E<br>@_I_P= 0 A|_TCI_O E|mA/°C|−0.40|±0.17|0.40|||
|Magnetic offset after 1000 ×_I_P N|_I_O M|mA||8||||
|Theoretical sensitivity|_S_N|V/A||2.22||||
|Sensitivity error|_εS_|%|−2||2||For_R_L> 500 kΩ|
|Temperature coeffcient of_S_|_TCS_|ppm/K|||±250|||
|Linearity error|_ε_L|% of_I_P R N|−3||3|||
|RMS noise current<br>1 Hz … 2 kHz referred to primary|_I_no|mA||7.5||||
|Delay time @ 10 % of_I_P N|_t_D 10|µs||25|||For_R_L> 500 kΩ;<br>d_i_/d_t_= 3 mA|
|Delay time @ 90 % of_I_P N|_t_D 90|µs||300|||For_R_L> 500 kΩ;<br>d_i_/d_t_= 3 mA|
|Start-up time|_t_start|ms||220||||
|Frequency bandwidth (−3 dB)|_BW_|kHz|mA|2|||For_R_L> 500 kΩ|
|Sum of sensitivity and linearity|_εS_L||−40||40|*|Without initial offset|
|Sum of sensitivity and linearity|_εS_L||−8||8||For ±30 mA instantaneous<br>DC jump|
|Sum of sensitivity and linearity|_εS_L||−12||12||For ±60 mA instantaneous<br>DC jump|
|Sum of sensitivity and linearity|_εS_L||−20||20||For ±150 mA instantaneous<br>DC jump|
|Degauss time||ms||120||||
|Degauss pin going voltage|IN Low|V|||1.62|||
||IN High|V|3.42|||||
||Pulse duration|ms|0.6|||||



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29January2019/version 0 

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

**LDSR 0.3-NP** 

## **Performance parameters definition** 

## **Transducer simplified model** 

The static model of the transducer at temperature _T_ A is: _U_ out = _S_ ⋅ _I_ P + _ε_ In which _ε_ = 

_U_ O E + _U_ O _T_ ( _T_ A) + _εS_ ⋅ _I_ P ⋅ _S_ + _ε_ L ( _I_ P R M) ⋅ _I_ P R M ⋅ _S_ + _TCS_ ⋅ ( _T_ A−25) ⋅ _I_ P ⋅ _S_ 

With: _I_ P R M max :  max primary residual measuring range applied to the transducer _U_ out : output voltage (V) _T_ A : ambient operating temperature (°C) _U_ O E : electrical offset voltage (V) _U_ O _T_ ( _T_ A) :  temperature variation of _U_ O at temperature _T_ A (°C) _S_ : sensitivity of the transducer (V/At) _TCS_ : temperature coefficient of _S εS_ : sensitivity error _ε_ L ( _I_ P R M ) : linearity error for _I_ P R M max 

## **Degauss** 

A rising edge on the “Degauss” pin will initiate the degauss cycle. During the cycle the output _U_ out does not carry relevant information. 

Notes:[1)] a degauss cycle is automatically initiated at power up 

2) the “Degauss” pin is provided with a 10 kΩ pull down resistor and can be left unconnected. The figure below describes the expected output during a degauss session. 

This model is valid for primary ampere-turns _I_ P between − _I_ P R M and + _I_ P R M only. 

## **Pre-conditionning** 

Before any test measure the transducer is pre conditioned by applying calibrated differential current cycles. 

## **Magnetic offset** 

The magnetic offset current _I_ O M is the consequence of a current on the primary side (“memory effect” of the transducer’s ferromagnetic parts). It is measured using the following primary current cycle. _I_ O M depends on the current value _I_ P1 ( _I_ P1 > _I_ P M). 

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−<br>I  = I S ( t 1) I S ( t 2) · 1<br>O M TS<br>2 S<br>I P (DC)<br>I<br>P N<br>t 2<br>0 A<br>t 1  t<br>−<br>I<br>P1<br>**----- End of picture text -----**<br>


Figure 1:  Pre-conditionning differential current cycles 

## **Sensitivity and linearity** 

Figure 1:  Current cycle used to measure magnetic and electrical offset (transducer supplied) 

To measure sensitivity and linearity, the primary current (DC) is cycled from 0 to _I_ P R M then to − _I_ P R M and back to 0 (equally spaced _I_ P R M/10 steps). The sensitivity _S_ is defined as the slope of the linear regression line for a cycle between ± _I_ P R N 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_ P R M. 

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**LDSR 0.3-NP** 

## **Performance parameters definition** 

## **Electrical offset** 

The electrical offset current _I_ O E 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 number. 

- Using the current cycle shown in figure _..._ , the electrical offset is: 

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The temperature variation _I_ O _T_ of the electrical offset current _I_ O E is the variation of the electrical offset from 25 °C to the considered temperature: 

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Note: the transducer has to be demagnetized prior to the application of the current cycle (for example with a demagnetization tunnel). 

## **Total error referred to primary** 

The total error at 25 °C _ε_ tot is the error in the − _I_ P N … + _I_ P N  range, relative to the rated value _I_ P N. It includes: 

- ●the electrical offset _I_ O E 

- ●the sensitivity error _εS_ 

- ●the linearity error _ε_ L (to _I_ P N) 

## **Delay times** 

The delay time shown in figure 2. _t_ D 10 @ 10 % and the delay time _t_ D 90 @ 90 % are 

Both slightly depend on the primary current d _i /_ d _t_ . They are measured at nominal current. 

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I<br>100 %<br>90 %<br>I P U out<br>t D 90<br>10 %<br>t D 10 t<br>**----- End of picture text -----**<br>


Figure 2: _t_ D 10 (delay time @ 10 %) and _t_ D 90 (delay time @ 90 %) 

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**LDSR 0.3-NP** 

## **Application information** 

## **Decoupling supply voltage** _U_ C **(5 V):** 

LDSR transducers are already provided with internal decoupling capacitors. 

Depending on the design it is advisable to add an external decoupling: 1 µF or more. 

If fast differential current surges are to be expected the decoupling capacitor should be increased in order to absorb the energy from internal protection diodes. 

In this case the capacitor should be increased to more than 10uF. 

Protection of test winding: 

If fast differential current surges are to be expected, the circuit connected to the test winding shall be protected to absorb the energy coupled from the primary surge. 

## **Load on** _U_ **:** out 

The maximum _U_ out current is 10 mA. The load on this output should be adapted to not exceed this current. 

## **Decoupling reference** _U_ ref **:** 

The maximum decoupling capacitor value is 47 nF. 

## **Output** _U_ out **properties:** 

The output is a direct operational amplifier output. The output current is limited to 10 mA. 

## **Using an external reference voltage:** 

If the _U_ ref pin of the transducer is not used it could be either left unconnected or filtered according to the previous paragraph “Reference _U_ ref”. 

If an external voltage reference is used its source capability must be at least 1.5 mA. 

## **Definition of typical, minimum and maximum values** 

Minimum and maximum values for specified limiting and safety conditions have to be understood as such as well as values shown in “typical” graphs. 

On the other hand, measured values are part of a statistical distribution that can be specified by an interval with upper and lower limits and a probability for measured values to lie within this interval. Unless otherwise stated (e.g. “100 % tested”), the LEM definition for such intervals designated with “min” and “max” is that the probability for values of samples to lie in this interval is 99.73 %. For a normal (Gaussian) distribution, this corresponds to an interval between −3 sigma and +3 sigma. If “typical” values are not obviously mean or average values, those values are defined to delimit intervals with a probability of 68.27 %, corresponding to an interval between −sigma and +sigma for a normal distribution. 

Typical, maximal and minimal values are determined during the initial characterization of the product. 

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**LDSR 0.3-NP** 

## **Primary nominal residual current and primary nominal current** 

The primary nominal residual current is the sum of the instantaneous values of all currents flowing through the primary circuit of the transducer. 

The presence of a primary nominal current DC or AC may lead to an additional uncertainty. 

For example, with a primary nominal current of 30 A the uncertainty is typically 1.2 % of the primary nominal residual current (1.2 % of 300 mA giving 3.6 mA). 

## **Test LDSR transducer** 

Twenty turns are available on the magnetic core in order to perform tests. The current is limited to 50 mA. 

## **PCB footprint according to the product** 

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Note: the dimension of customer PCB tracks (width & thickness) and the LEM transducer’s primary PCB are linked and can influence on each other temperature heating. 

## **Assembly on PCB** 

- ●Recommended PCB hole diameter 

⌀ 2.9 mm for primary pin 

   - ⌀ 1 mm for secondary pin 

- ●Maximum PCB thickness 

- ●Wave soldering profile No clean process only 

- 2.4 mm maximum 260 °C, 10 s 

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**LDSR 0.3-NP** 

## **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 (e.g. 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. 

## ESD susceptibility 

The product is susceptible to be damaged from an ESD event and the personnel should be grounded when handling it. 

Underwriters Laboratory Inc. recognized component 

## **Remark** 

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: **www.lem.com/en/file/3137/download.** 

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**LDSR 0.3-NP** 

## **Dimensions** (in mm) 

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Connection<br>d d<br>CI Cp<br>10.9 10.9<br>6.9 6.9<br>**----- End of picture text -----**<br>


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**LDSR 0.3-NP** 

## **Creepage and Clearance** 

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**LDSR 0.3-NP** 

## **Packaging information** 

Standard delivery in cardboard:  L × W × H: 300 × 200 × 200 mm Each carboard contains 60 parts, placed into 3 Polystyrene-made trays of 20 parts each one. Both trays and carboard are ESD-compliant. 

The typical weight of the cardboard is 2.5 Kg. 

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