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| Current Transducer LA 305-S/SP22 For the electronic measurement of currents : DC, AC, pulsed..., with a galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). IPN = 300 A Electrical data IPN IP RM Primary nominal r.m.s. current Primary current, measuring range Measuring resistance @ with 15 V ISN KN VC IC Vb Vd @ 300 A @ 500 A 300 0 .. 500 TA = 70C TA = 85C RM min RM max RM min RM max max max A A Features * Closed loop (compensated) current transducer using the Hall effect * Insulated plastic case recognized mA V mA V V kV kV according to UL 94-V0 0 0 75 31 5 5 73 29 * Copyright protected. Secondary nominal r.m.s. current Conversion ratio Supply voltage ( 5 %) Current consumption R.m.s. rated voltage 1), safe separation basic isolation R.m.s. voltage for AC isolation test, 50 Hz, 1 mn 120 1 : 2500 15 20 + IS 1750 3500 2.5 2) 1 3) Special features * VC = 15 ( 5 %) V * TA = - 25C .. + 85C * Connection to secondary circuit on LEMO EGJ.0B.303.CNA Accuracy - Dynamic performance data XG * Potted * Internal and external shield * Serigraphy with customer specification number L Overall accuracy @ IPN , TA = 25C Linearity Offset current @ IP = 0, TA = 25C Residual current 4) @ IP = 0, after an overload of 3 x IPN Thermal drift of IO - 25C .. + 85C Reaction time @ 10 % of IPN Response time 5) @ 90 % of IPN di/dt accurately followed Frequency bandwidth (- 3 dB) 0.8 < 0.1 Max 0.20 0.40 0.12 0.40 < 500 <1 > 100 DC .. 100 Typ % % mA mA mA ns s A/s kHz * Railway equipment. 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. IO I OM IOT tra tr di/dt f General data TA TS RS m Ambient operating temperature Ambient storage temperature Secondary coil resistance @ Mass Standards 1) TA = 70C TA = 85C - 25 .. + 85 - 40 .. + 90 35 37 320 EN 50155 C C g Applications * AC variable speed drives and servo motor drives * Static converters for DC motor drives * Battery supplied applications * Uninterruptible Power Supplies (UPS) Notes : 2) 3) 4) 5) Pollution class 2. With a non insulated primary bar which fills the through-hole Between primary and secondary + shields Between secondary and internal shield + external shied The internal shield is connected to external shield The result of the coercive field of the magnetic circuit With a di/dt of 100 A/s. * Switched Mode Power Supplies (SMPS) * Power supplies for welding applications. 030205/2 LEM Components w w w.lem.com Dimensions LA 305-S/SP22 (in mm. 1 mm = 0.0394 inch) Front view Left view Connection Top view Mechanical characteristics * General tolerance * Transducer fastening Fastening torque, max. * Primary through-hole * Connection of secondary 0.5 mm 2 holes 5.5 mm 2 M5 steel screws 4 Nm or 2.95 Lb. - Ft. 25.5 x 25.5 mm LEMO EGJ.0B.303.CNA Remarks * IS is positive when IP flows in the direction of the arrow. * Temperature of the primary conductor should not exceed 100C. * Dynamic performances (di/dt and response time) are best with a single bar completely filling the primary hole. LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. |
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