Voltage transducer DVL 50

Transcription

1 Voltage transducer DVL 5 V PN = 5 V For the electronic measurement of voltage: DC, AC, pulsed..., with galvanic isolation between the primary and the secondary circuit. Features Bipolar and isolated measurement up to 75 V Current output Input and output connections with M5 studs Compatible with AV 1 family. Advantages Low consumption and low losses Compact design Good behavior under common mode variations Excellent accuracy (offset, sensitivity, linearity) Good response time Low temperature drift High immunity to external interferences. Applications Single or three phase inverter Propulsion and braking chopper Propulsion converter Auxiliary converter High power drives Substations. Standards EN 5155: 7 EN 5178: 1997 EN : 6 EN 514-1: 1 Isolated plastic case material recognized according to UL 94-VO. Application Domain Traction (fixed and onboard) Industrial. N 97.H9.5.. Page 1/8

2 DVL 5 Absolute maximum ratings Parameter Symbol Value Maximum supply voltage (V P =,.1 s) ±34 V Maximum supply voltage (working) ( C) ±V C ±6.4 V Maximum input voltage ( C) 75 V Maximum steady state input voltage ( C) V PN 5 V see derating on figure Absolute maximum ratings apply at 5 C unless otherwise noted. Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade reliability. Isolation characteristics Parameter Symbol Unit Min Comment RMS voltage for AC isolation test 5/6Hz/1 min V d kv % tested in production Maximum impulse test voltage (1./5 µs exponential shape) kv 16 Isolation resistance R IS MΩ measured at 5 V DC Partial discharge extinction voltage 1 pc V e V 7 Comparative tracking index CTI V 6 Clearance and creepage See dimensions drawing on page 8 Environmental and mechanical characteristics Parameter Symbol Unit Min Typ Max Ambient operating temperature T A C Ambient storage temperature T S C -5 9 Mass m g 3 Page /8

3 DVL 5 Electrical data DVL 5 At T A = 5 C, ±V C = ±4 V, R M = 1 Ω, unless otherwise noted. Lines with a * in the conditions column apply over the C ambient temperature range. Parameter Symbol Unit Min Typ Max Conditions Primary nominal voltage, rms V PN V 5 * Primary voltage, measuring range V PM V * Measuring resistance R M Ω 133 * See derating on figure. For V PM < 75 V, max value of R M is given on figure 1 Secondary nominal current, rms I SN ma 5 * Output range I S ma * Supply voltage ±V C V ±13.5 ±4 ±6.4 * Supply rise time (1-9%) ms 1 Current V C = ±4 V I C ma + I S 5 + I S Offset current I O µa % tested in production Offset drift I OT µa C C Sensitivity G µa/v 1 5 ma for 5 V Sensitivity error ε G % -.. Thermal drift of sensitivity ε GT % * Linearity error ε L % * ±75V range Overall accuracy X G % of V PN * 5 C; 1% tested in production C Output current noise, rms i no µa rms 47 1 Hz to 1 khz Reaction 1 % of V PN t ra µs 3 Response 9 % of V PN t r µs 5 6 to 5V step, 6 kv/µs Frequency bandwidth BW khz db -1 db -.1 db Start-up time ms 19 5 * Primary resistance R 1 MΩ.7 * Total primary power V PN P mw.9 * Min., Max., Typ. definition Some parameters have a statistically normal distribution. The typical value published in the LEM datasheet is the mean or average value of the distribution. The typical value listed is the 1 sigma value. This means that in 68 % of the devices tested, the parameters is found to be ± the typical value or better. LEM currently uses ± 3 sigma (99.73 %) to define minimum and maximum values. Usually, typical values are set when the part is characterized and never changes. Page 3/8

4 DVL 5 Typical performance characteristics Maximum measuring resistance (Ohm) T A = C V C = ±13.5 to ±6.4 V Minimum measuring resistance (Ohm) Vc = ±4 V Vc = ±15 V T A = C Measuring range (V) Nominal input voltage (V) Figure 1: Maximum measuring resistance Figure : Minimum measuring resistance; For T A under 8 C, the minimum measuring resistance is Ω whatever V C Electrical offset drift (ua) 5 Max 15 Typical Min Overall accuracy (%) Max Typical Min Ambient temperature ( C) Ambient temperature ( C) Figure 3: Electrical offset thermal drift Figure 4: Overall accuracy in temperature Sensitivity drift (%) Max Mean Min Ambient temperature ( C) Input V P : 1 V/div Output I S : 1 ma/div Timebase: µs/div Figure 5: Sensitivity thermal drift Figure 6: Typical step response ( to 5 V) Page 4/8

5 DVL 5 Typical performance characteristics (continued) Typical supply current (ma) T A = 5 C, V P = V Typical supply current (ma) Vc = 15 V 5 Vc = 4 V Supply voltage ( V) Ambient temperature ( C) Figure 7: Supply current function of supply voltage Figure 8: Supply current function of temperature Gain (db) Phase (deg) Figure 9: Typical frequency and phase response Gain (db) Phase(deg) Figure 1: Typical frequency and phase response (detail) Page 5/8

6 DVL 5 Typical performance charateristics (continued) Input V P : kv/div Output I S : 5 µa/div Timebase: 1 µs/div Input V P : kv/div Output I S : 5 µa/div Timebase: µs/div Figure 11: Typical common mode perturbation Figure 1: Detail of typical common mode perturbation (V step with 6 kv/µs R M = 1 Ω) ( V step with 6 kv/µs, R M = 1 Ω) Vn (dbvrms/rthz) Figure 13: Typical noise voltage density of V (R M ) with R M = 5 Ω In (Arms) 1E-4 1E-5 1E-6 1E-7 1E Figure 14: Typical total output current noise (rms) with R M = 5 Ω ( fc is upper cut-off frequency of bandpass, low cut off frequency is 1 Hz) Linearity error (% of 5 V) Primary voltage (V) Figure 13 (noise voltage density) shows that there are no significant discrete frequencies in the output. Figure 14 confirms the absence of steps in the total output current noise that would indicate discrete frequencies. To calculate the noise in a frequency band f1 to f, the formula is In(f1to f) = In(f) In(f1) with In(f) read from figure 14 (typical, rms value). Example: What is the noise from 1 to 1 Hz? Figure 14 gives In(1 Hz) =.6 µa and In(1 Hz) =.4 µa. The output current noise (rms) is therefore 6 6 (.4 1 ) (.6 1 ) =.3 µ A Figure 15: Typical linearity error at 5 C Page 6/8

7 DVL 5 Performance parameters definition The schematic used to measure all electrical parameters are: VP +HV -HV Isolation barrier + - M IS RM +VC -VC V Sensitivity and linearity To measure sensitivity and linearity, the primary voltage (DC) is cycled from to V PM, then to -V PM and back to (equally spaced V PM /1 steps). The sensitivity G is defined as the slope of the linear regression line for a cycle between ± V PM. The linearity error ε L is the maximum positive or negative difference between the measured points and the linear regression line, expressed in % of the maximum measured value. Figure 16: standard characterization schematics for current output transducers (R M = 5 Ω unless otherwise noted) Magnetic offset Due to its working principle, this type of transducer has no magnetic offset current I OM. Transducer simplified model The static model of the transducer at temperature T A is: I S = G V P + error In which error = I OE + I OT (T A ) + ε G G V P + ε GT (T A ) G V P + ε L G V PM I S : the secondary current (A) G : the sensitivity of the transducer (A/V) V P : the voltage to measure (V) V PM : the measuring range (V) T A : the ambient temperature ( C) I OE : the electrical offset current (A) I OT (T A ) : the temperature variation of I O at temperature T A (A) ε G : the sensitivity error at 5 C ε GT (T A ) : the thermal drift of sensitivity at temperature T A ε L : the linearity error Electrical offset The electrical offset current I OE is the residual output current when the input voltage is zero. The temperature variation I OT of the electrical offset current I OE is the variation of the electrical offset from 5 C to the considered temperature. Overall accuracy The overall accuracy X G is the error at ±V PN, relative to the rated value V PN. It includes all errors mentionned above. Response and reaction times The response time t r and the reaction time t ra are shown in the next figure. Both slightly depend on the primary voltage dv/dt. They are measured at nominal voltage. This is the absolute maximum error. As all errors are independent, a more realistic way to calculate the error would be to use the following formula: error = ( error_ component) 1 % 9 % V P t r I s 1 % t ra t Figure 17: response time t r and reaction time t ra Page 7/8

8 DVL 5 Dimensions DVL 5 (in mm) Connection Mechanical characteristics General tolerance ± 1 mm Transducer fastening holes 6.5 mm M6 steel screws Recommended fastening torque 4 Nm Connection of primary M5 threaded studs Recommended fastening torque. Nm Connection of secondary 3 M5 threaded studs Recommended fastening torque. Nm Remarks I S is positive when a positive voltage is applied on +HV. The transducer is directly connected to the primary voltage. The primary cables have to be routed together all the way. The secondary cables also have to be routed together all the way. Installation of the transducer is to be done without primary or secondary voltage present. 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. Page 8/8