CT25-T

Current Transducer CT 25-T For very accurate measurements of currents : DC, AC, pulsed..., with a galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). IPN = 25 A Preliminary Electrical data IP N IP VO U T KN RL CL tC VC IC Vd Primary nominal r.m.s. current Primary current, measuring range Analog output voltage Conversion ratio Load resistance Capacitance loading Output short-circuit duration 1) Supply voltage (± 5 %) Current consumption R.m.s. voltage for AC isolation test, 50 Hz, 1 mn 25 0 .. ± 37.5 5 25 A / 5 V > 500 ≤5 A A V Ω nF s V mA kV Features •Closed loop (compensated) current transducer •Insulated plastic case recognized according to UL 94-V0 ∞ •Patent pending. ± 15 90 + VOUT / RL 6 Advanced features •f = 500 kHz •X G = ± 0.1 % (- 25°C .. + 70°C). Accuracy - Dynamic performance data XG VO f Overall accuracy @ I P N Offset voltage @ I P = 0 - 25°C .. + 70°C TA = 25°C - 25°C .. + 70°C ± 0.1 Typ Max ± 0.4 ± 0.6 % mV mV kHz Advantages •Excellent accuracy •Very good linearity •Low temperature drift •Optimized response time •Wide frequency bandwidth •No insertion losses •High immunity to external interference Frequency bandwidth (- 3 dB) @ 10 % of I PN DC .. 500 General data TA TS m Ambient operating temperature Ambient storage temperature Mass Standards 2) - 25 .. + 70 - 40 .. + 85 670 EN 50178 °C °C g •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. Notes : 1) 2) If the short-circuit has a duration more than 1 s, the primary current of the supply voltage must be interrupted for a short time to restore the transducer to proper working order. The internal protection is done by PTC resistors A list of corresponding tests is available. 980814/5 LEM Components w w w .lem.com Dimensions CT 25-T Front view (in mm. 1 mm = 0.0394 inch) Left view Secondary terminals Terminal Terminal Terminal Terminal + M 0 : : : : supply voltage + 15 V measure 0V supply voltage - 15 V Connection Top view Mechanical characteristics •General tolerance •Fastening •Connection of primary •Connection of secondary •Fastening torque ± 0.3 mm 2 x M5 screws M5 threaded studs M5 threaded studs 2.2 Nm or 1.62 Lb - Ft Remarks •VOUT is positive when IP flows in the direction of the arrow. •This transducer induces into the primary circuit a square wave of 14 mV amplitude (frequency ≈220 Hz). This voltage can induce an AC current in the primary if the primary impedance is low. •This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us. LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.