Isolation voltages up to 1000 V in the electrical wiring of hybrid or electrical cars require new approaches toward measurement. A fully isolated high voltage divider may facilitate measurements on automotive batteries and DC power circuits.
SAM-HViso DC1000 by Ipetronik is a high voltage divider with full electrical isolation that allows voltage measurement for batteries and DC power circuits in electric and hybrid vehicles. The solution, a cut-in module for measurements on high-voltage systems, consists of two components. The ISO voltage divider is an electrically isolating amplifier which is used as a pre-stage for standard voltage-measurement modules and has the advantage of allowing continued use of the existing measuring equipment. The second part is an intrinsically safe measurement cable with current-limiting resistors at the terminal points. The characteristics of these resistors are chosen in a way to keep the leakage current below harmful levels even in case of a damaged cable.
The ISO voltage divider from the newly appointed AMA member is enclosed in a 100 mm x 51 mm x 25 mm (L x W x H) housing. It conforms to Protection Class IP67 and works at temperatures between -20 °C and +70 °C. Its standard measuring range is ±1000 V, it withstands a continuous isolation voltage of ±1100 V, the test isolation voltage (1 s) reaches ±2500 V. The amplifier impedance is 20 MΩ//20 pF the measurement input impedance 21 MΩ//(20 pF + approx. 100 pF/m). The signal frequency is in the area of 2 kHz for a length of one meter of measuring cable.
“The fast-paced development for electric and hybrid vehicles confronts test and measurement technicians with completely new voltage potentials. Whereas in the past, an isolation voltage of 500 V was usually sufficient, that is no longer the case with new vehicle concepts with voltages of up to 1000 V. In this range, galvanic isolation is indispensable, because large differences in potential lead to falsified measurement results. Furthermore, short circuiting and other damage can occur if the galvanic isolation is insufficient,” said Andreas Geh, director of sales & marketing at Ipetronik. “The high-voltage divider for direct current is the ideal solution for electric and hybrid vehicles, because it makes it possible to perform reliable measurements on DC circuits for high voltage batteries.”
The ISO voltage divider from the newly appointed AMA member is enclosed in a 100 mm x 51 mm x 25 mm (L x W x H) housing. It conforms to Protection Class IP67 and works at temperatures between -20 °C and +70 °C. Its standard measuring range is ±1000 V, it withstands a continuous isolation voltage of ±1100 V, the test isolation voltage (1 s) reaches ±2500 V. The amplifier impedance is 20 MΩ//20 pF the measurement input impedance 21 MΩ//(20 pF + approx. 100 pF/m). The signal frequency is in the area of 2 kHz for a length of one meter of measuring cable.
“The fast-paced development for electric and hybrid vehicles confronts test and measurement technicians with completely new voltage potentials. Whereas in the past, an isolation voltage of 500 V was usually sufficient, that is no longer the case with new vehicle concepts with voltages of up to 1000 V. In this range, galvanic isolation is indispensable, because large differences in potential lead to falsified measurement results. Furthermore, short circuiting and other damage can occur if the galvanic isolation is insufficient,” said Andreas Geh, director of sales & marketing at Ipetronik. “The high-voltage divider for direct current is the ideal solution for electric and hybrid vehicles, because it makes it possible to perform reliable measurements on DC circuits for high voltage batteries.”
Finally, the device has successfully passed the safety testing performed by TÜV SÜD. This examination was conducted in accordance with the safety standards for electrical devices for test, measurement, control and laboratory tasks in accordance with the EN 61010-1, EN 61010-031 standard. Consequently, the device may also be used in 230/400 VAC/ 50 Hz power networks.
Picture credits: Iptetronik
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