For the electronic measurement of voltage: DC, AC, pulsed..., with galvanic separation between the primary and the secondary circuit.
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- Benjamin Kristopher Clarke
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1 Voltage transducer DV V PN = V For the electronic measurement of voltage: DC, AC, pulsed..., with galvanic separation between the primary and the secondary circuit. Features Applications Bipolar and insulated measurement up to 3 V Current output Primary input on cables Footprint compatible with OV, CV 4 and LV -AW/ families. Auxiliary converters High power drives Advantages Substations Low consumption and low losses Compact design Good behavior under common mode variations Excellent accuracy (offset, sensitivity, linearity) Response time 6 µs Low temperature drift High immunity to external interferences. Single or three phase inverters Propulsion and braking choppers Propulsion converters On-board energy meters Energy metering. Standards EN 5155: 7 EN 514-1: 1 EN : 6. EN 5463: 1. Application Domain Traction (fixed and onboard). N 97.F.6.. Page 1/8
2 DV Absolute maximum ratings Parameter Symbol Value Maximum supply voltage (V P =,.1 s) ±U C ±34 V Maximum supply voltage (working) ( C) ±U C ±6.4 V Maximum input voltage ( C) V P 3 kv Maximum steady state input voltage ( C) V PN 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. Insulation coordination Parameter Symbol Unit Value Comment RMS voltage for AC insulation test 5/6Hz/1 min U d kv % tested in production Impulse withstand voltage 1./5 µs Û W kv 3 Partial discharge extinction rms 1 pc (rms) U e V 5 Insulation resistance R IS MΩ measured at 5 V DC Clearance (pri. - sec.) d CI mm see dimensions drawing on Creepage distance (pri. - sec.) d Cp mm page 8 Case material - - V according to UL 94 Comparative tracking index CTI V 6 Shortest distance through air Shortest path along device body Environmental and mechanical characteristics Parameter Symbol Unit Min Typ Max Ambient operating temperature T A C Ambient storage temperature T S C Mass m g 75 Parameter Accuracy class Comment Class accuracy for a rated primary voltage V PN = 15 V Class accuracy for a rated primary voltage V PN = 75 V.5 R According to EN R According to EN Page /8
3 DV Electrical data DV At T A = 5 C, U C = ±4 V, R = 1 Ω, unless otherwise noted. M Lines with a * in the conditions column apply over the C ambient temperature range. Parameter Symbol Unit Min Typ Max Conditions Primary nominal rms voltage V PN V * Primary voltage, measuring range V PM V -3 3 * Measuring resistance R M Ω * See derating on figure. For V PM < 3 V, max value of R M is given on figure 1 Secondary nominal rms current I SN ma 5 * Output range I S ma * Supply voltage ±U C V ±13.5 ±4 ±6.4 * Supply rise time (1-9%) ms 1 Current U 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,1% tested in production Sensitivity G µa/v 5 5 ma for V Sensitivity error ε G % -.. Thermal drift of sensitivity ε GT % Page 3/ * C C C Linearity error ε L % * ± 3 V range Overall accuracy X G % of V PN * 5 C; 1% tested in production C C C Output rms current noise I no µa 1 1 Hz to 1 khz Reaction 1 % of V PN t ra µs 1 Response 9 % of V PN t r µs 48 6 to V step, 6 kv/µs Frequency bandwidth BW khz Start-up time ms 19 5 * Primary resistance R 1 MΩ 3 * Total primary power V PN P W.17 * db 1 db.1 db 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. 1 % 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 %. 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 68.7 %, corresponding to an interval between -sigma and +sigma for a normal distribution. Typical, maximal and minimal values are determined during the initial characterization of a product.
4 DV Typical performance characteristics Maximum measuring resistance (Ohm) T A = C U C = ±13.5 to ±6.4 V Minimum measuring resistance (Ohm) Uc = ±4 V Uc = ±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 U C Electrical offset drift (ua) Max 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 (%).8 Max.6 Typical.4 Min Ambient temperature ( C) Input V P : 4 V/div Output I S : 1 ma/div Timebase: µs/div Figure 5: Sensitivity thermal drift Figure 6: Typical step response ( to V) Page 4/8
5 DV Typical performance characteristics continued 4 35 Typical supply current (ma) T A = 5 C, V P = Supply voltage (± V) Typical supply current (ma) Uc = 15 V 5 Uc = 4 V Ambient temperature ( C) Figure 7: Supply current function of supply voltage Gain (db) M MSr 8-Jul-8 1:11: Frequency (Hz) Figure 8 Supply current function of temperature Phase (deg) MSr 8-Jul-8 1:11: Frequency (Hz).1 Frequency response Device: DV4/SP4, R M = 5 ohm Figure 9: Typical frequency response Frequency response Device: DV4/SP4, R M = 5 ohm Gain (db) Phase (deg) MSr 8-Jul-8 1:11: Frequency (Hz) -9 MSr 8-Jul-8 1:11: Frequency (Hz) Figure 1: Typical frequency response (detail) Page 5/8
6 DV Typical performance characteristics continued Input V P : 1 V/div Output I S : 5 µa/div Timebase: 1 µs/div Input V P : 1 V/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) Figure 13: Typical noise power density of V (R M ) with R M = 5 Ω 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 6 kv).3%.%.1%.% -.1% -.% -.3% Primary voltage (V) Figure 13: (noise power 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: I no (f1 to f) = I no (f) I no (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) =.3 µa and In(1 Hz) =.8 µa. The output current noise (rms) is therefore. 6 6 (.8 1 ) (.31 ) =.77 µ A Figure 15: Typical linearity error Page 6/8
7 DV Performance parameters definition The schematic used to measure all electrical parameters are: Figure 16: standard characterization schematics for current output transducers (R M = 5 Ω unless otherwise noted) V P VP +HV -HV +HV -HV Isolation barrier Isolation barrier Figure 17: standard characterization schematics for voltage output transducers (R M = 1 kω unless otherwise noted) For all the following explanations, the output currents I S, I O, I OT, etc. should be replaced by voltages for transducers with voltage output: V S, V O, V OT etc. 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 + - C M V M I S V S R M +UC -UC +U C -U C V V 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 = 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. Magnetic offset Due to its working principle, this type of transducer has no magnetic offset current I OM. 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 ( error_ component) 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 depend on the primary voltage dv/dt. They are measured at nominal voltage. I S : secondary current (A) G : sensitivity of the transducer (A/V) V P : primary voltage (V) V PM : primary voltage, measuring range (V) T A : ambient operating temperature ( C) I OE : electrical offset current (A) I OT (T A ) : temperature variation of I O at temperature T A (A) ε G : sensitivity error at 5 C ε GT (T A ) : thermal drift of sensitivity at 1 % 9 % V p 1 % I t r I S ε L temperature T A : linearity error t ra t Figure 18: response time t r and reaction time t ra Page 7/8
8 DV Dimensions DV (in mm) Connection Mechanical characteristics General tolerance ± 1 mm Transducer fastening 4 M6 steel screws 4 washers ext. 18 mm Recommended fastening torque 5 N m Connection of primary x 1.5 mm cables Connection of secondary 3 x.5 mm shielded cable Earth connection M5 threaded stud Recommended fastening torque. N m 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
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