DVL 750

Voltage transducer DVL 750 VPN = 750 V For the electronic measurement of voltage: DC, AC, pulsed..., with galvanic isolation between the primary and the secondary circuit. Features Applications ●● Bipolar and isolated measurement up to 1125 V ●● Single or three phase inverter ●● Current output ●● Propulsion and braking chopper ●● Input and output connections with M5 studs ●● Propulsion converter ●● Compatible with AV 100 family. ●● Auxiliary converter ●● High power drives Advantages ●● Substations. ●● Low consumption and low losses ●● Compact design Standards ●● Good behavior under common mode variations ●● EN 50155 ●● Excellent accuracy (offset, sensitivity, linearity) ●● EN 50178 ●● Good response time ●● EN 50121-3-2 ●● Low temperature drift ●● EN 50124-1 ●● High immunity to external interferences. ●● Isolated plastic case material recognized according to UL 94-VO. Application Domain ●● Traction (fixed and onboard) ●● Industrial. Page 1/8 16August2012/version 0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com DVL 750 Absolute maximum ratings Parameter Symbol Value ±34 V Maximum supply voltage (VP = 0, 0.1 s) Maximum supply voltage (working) (-40 .. 85 °C) ±26.4 V ±VC Maximum input voltage (-40 .. 85 °C) 1125 V Maximum steady state input voltage (-40 .. 85 °C) 750 V see derating on figure 2 VPN Absolute maximum ratings apply at 25°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 Vd kV 8.5 100 % tested in production kV 12 RMS voltage for AC isolation test 50/60Hz/1 min Maximum impulse test voltage (1.2/50 µs exponential shape) Isolation resistance RIS MΩ 200 Partial discharge extinction voltage rms @ 10 pC Ve V 2700 Comparative tracking index CTI V 600 Clearance and creepage measured at 500 V DC See dimensions drawing on page 8 Environmental and mechanical characteristics Parameter Symbol Unit Min Ambient operating temperature TA °C -40 85 Ambient storage temperature TS °C -50 90 Mass m g Standards Typ Max 270 EN 50155: 2007 EN 50121-3-2:2006 EN 50124-1: 2001 EN 50178: 1997 Page 2/8 16August2012/version 0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com DVL 750 Electrical data DVL 750 At TA = 25°C, ±VC = ±24 V, RM = 100 Ω, unless otherwise noted. Lines with a * in the conditions column apply over the -40 .. 85 °C ambient temperature range. Parameter Symbol Unit Primary nominal voltage, rms VPN V Primary voltage, measuring range VPM V Min -1125 RM Ω Secondary nominal current, rms ISN mA Output range IS mA -75 ±VC V ±13.5 Supply rise time (10-90%) Max 750 Measuring resistance Supply voltage Typ 0 * 1125 * 120 * See derating on figure 2. For │VPM│< 1125 V, max value of RM is given on figure 1 50 ±24 ms Conditions * 75 * ±26.4 * 100 Current consumption @ VC = ±24 V IC mA Offset current IO µA -50 Offset drift IOT µA -120 -150 Sensitivity G µA/V Sensitivity error εG % -0.2 Thermal drift of sensitivity εGT % -0.5 0.5 * Linearity error εL % -0.5 0.5 * ±1125 V range Overall accuracy XG % of VPN -0.5 0.5 -1 1 20 + IS 25 + IS 0 50 100% tested in production 120 150 -25 .. 85 °C -40 .. 85 °C 66.66 0 Output current noise, rms ino µArms 10 Reaction time @ 10 % of VPN tra µs 30 Response time @ 90 % of VPN tr µs 50 BW kHz 14 8 2 ms 190 Frequency bandwidth Start-up time 50 mA for 750 V 0.2 * 25°C; 100% tested in production -40 .. 85 °C 1 Hz to 100 kHz 60 0 to 750 V step, 6 kV/µs -3 dB -1 dB -0.1 dB 250 * Primary resistance R1 MΩ 11.3 * Total primary power loss @ VPN P W 0.05 * Page 3/8 16August2012/version 0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com DVL 750 500 Minimum measuring resistance (Ohm) Maximum measuring resistance (Ohm) Typical performance characteristics 400 300 200 TA = -40 .. 85 C VC = 13.5 to 26.4 V 100 0 0 200 400 600 800 1000 1200 100 90 80 70 60 50 40 30 20 10 0 Vc = ±24 V Vc = ±15 V TA = -40 .. 85 C 0 150 Figure 1: Maximum measuring resistance Overall accuracy (%) Electrical offset drift (uA) 50 -50 -150 -250 -50 -25 0 25 50 75 Sensitivity drift (%) 0.8 750 Max Typical Min 0.80 0.40 0.00 -0.40 -0.80 -1.20 100 -50 -25 0 25 50 75 100 Ambient temperature (°C) Ambient temperature (°C) Figure 3: Electrical offset thermal drift 600 Figure 2: Minimum measuring resistance; For TA under 80°C, the minimum measuring resistance is 0 Ω whatever VC 1.20 Max Typical Min 150 450 Nominal input voltage (V) Measuring range (V) 250 300 Figure 4: Overall accuracy in temperature Max Mean Min 0.6 0.4 0.2 0.0 -0.2 Input VP: 150 V/div Output IS: 10 mA/div Timebase: 20 µs/div -0.4 -0.6 -0.8 -50 -25 0 25 50 75 100 Ambient temperature (°C) Figure 5: Sensitivity thermal drift Figure 6: Typical step response (0 to 750 V) Page 4/8 16August2012/version 0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com DVL 750 Typical performance characteristics (continued) 35 TA = 25°C, VP = 0 V 0 5 10 15 20 25 30 Typical supply current (mA) Typical supply current (mA) 45 40 35 30 25 20 15 10 5 0 30 25 20 15 10 Vc = 15 V 5 Vc = 24 V 0 -50 Supply voltage ( V) 25 50 75 100 Figure 8: Supply current function of temperature 10 180 0 120 Phase (deg) -10 Gain (dB) 0 Ambient temperature (°C) Figure 7: Supply current function of supply voltage -20 -30 -40 60 0 -60 -120 -50 -60 0.01 -25 0.1 1 10 -180 0.01 100 0.1 1 10 100 Frequency (kHz) Frequency (kHz) 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1 0.01 Phase(deg) Gain (dB) Figure 9: Typical frequency and phase response 0.1 1 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 0.01 0.1 Frequency (kHz) 1 10 Frequency (kHz) Figure 10: Typical frequency and phase response (detail) Page 5/8 16August2012/version 0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com DVL 750 Typical performance charateristics (continued) Input VP: 500 V/div Output IS: 2 mA/div Timebase: 100 µs/div Input VP: 500 V/div Output IS: 500 µA/div Timebase: 20 µs/div Figure 11: Typical common mode perturbation (750 V step with 6 kV/µs RM = 100 Ω) 1E-4 1E-5 Vn (dBVrms/rtHz) -100 -105 -110 -115 -120 -125 -130 -135 -140 -145 -150 0.001 Figure 12: Detail of typical common mode perturbation (750 V step with 6 kV/µs, RM = 100 Ω) 1E-6 1E-7 0.01 0.1 1 10 100 1E-8 0.001 0.01 0.1 Figure 13: Typical noise power density of V (RM) with RM = 50 Ω Linearity error (% of 750 V) 10 100 1000 Frequency (kHz) Frequency (kHz) 1 0.06 Figure 14: Typical total output current noise (rms) with RM = 50 Ω (fc is upper cut-off frequency of bandpass, low cut off frequency is 1 Hz) 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 f2, the formula is 0.04 0.02 In(f1 to f2) = In(f2) − In(f1) 0.00 2 2 with In(f) read from figure 14 (typical, rms value). -0.02 -0.04 -0.06 -1125 -750 -375 0 375 750 Primary voltage (V) 1125 Example: What is the noise from 10 to 100 Hz? Figure 14 gives In(10 Hz) = 0.26 µA and In(100 Hz) = 0.8 µA. The output current noise (rms) is therefore ⋅ (0.8 ⋅10 ) − (0.26⋅10 ) = 0.76 µA −6 2 −6 2 Figure 15: Typical linearity error at 25°C Page 6/8 16August2012/version 0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com DVL 750 Performance parameters definition The schematic used to measure all electrical parameters are: +VC + +HV VP M IS RM 0V -HV - -VC Isolation barrier Figure 16: standard characterization schematics for current output transducers (RM = 50 Ω unless otherwise noted) Sensitivity and linearity To measure sensitivity and linearity, the primary voltage (DC) is cycled from 0 to VPM, then to -VPM and back to 0 (equally spaced VPM/10 steps). The sensitivity G is defined as the slope of the linear regression line for a cycle between ± VPM. The linearity error εL 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 IOM. Transducer simplified model Electrical offset The static model of the transducer at temperature TA is: IS = G VP + error In which error = IOE + IOT (TA) + εG G VP + εGT (TA) G VP + εL G VPM The electrical offset current IOE is the residual output current when the input voltage is zero. The temperature variation IOT of the electrical offset current IOE is the variation of the electrical offset from 25°C to the considered temperature. IS : the secondary current (A) G : the sensitivity of the transducer (A/V) VP : the voltage to measure (V) VPM : the measuring range (V) TA : the ambient temperature (°C) IOE : the electrical offset current (A) IOT(TA) : the temperature variation of IO at temperature TA (A) εG : the sensitivity error at 25°C εGT (TA) : the thermal drift of sensitivity at temperature TA εL : the linearity error Overall accuracy The overall accuracy XG is the error at ±VPN, relative to the rated value VPN. It includes all errors mentionned above. Response and reaction times The response time tr and the reaction time tra 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 = 100 % 90 % VP ∑ (error _ component) 2 Is tr 10 % tra t Figure 17: response time tr and reaction time tra I 100 % 90 % Ip 16August2012/version 0 Is Page 7/8 www.lem.com LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice tr 10 % tra t DVL 750 Dimensions DVL 750 (in mm.) Connection Safety Mechanical characteristics ●● General tolerance ●● Transducer fastening Recommended fastening torque ●● Connection of primary Recommended fastening torque ●● Connection of secondary Recommended fastening torque ± 1 mm 2 holes ∅ 6.5 mm 2 M6 steel screws 4 Nm 2 M5 threaded studs 2.2 Nm 3 M5 threaded studs 2.2 Nm Caution, risk of electrical shock Remarks IS 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. ●● ●● ●● ●● 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. 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 16August2012/version 0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com