High Voltage Power Measurement made accurate

The VT1005 High Voltage Divider provides the best solution for accurate power measurement up to 5kVrms and 4MHz in combination with the Power Analyzer PW8001.

In order to meet the continuous need for more electrical power, there is a trend to introduce higher system voltages in a wide range of applications. One particular application is accurate efficiency measurement of electrical drivetrains for trains, trucks and busses that are operating at voltages higher than 1000V.

Accurate power loss measurement of inductive components used in HV power electronics is another interesting application. Engineers prefer to measure the loss in these devices under real life conditions and the very low power factor of these measurements requires a phase error compensation to achieve accurate measurements. This can be realized with the combination of the High Voltage Divider and the Power Analyzer PW8001.

SiC semiconductors are increasingly used for high voltage applications with switching frequencies of 50kHz or higher. The VT1005 High Voltage Divider is the only solution on the market today that is designed to provide accurate results even at these high switching frequencies.

Features of the HIOKI VT1005

• Input Voltage up to 5kVrms / 7.1kVpeak
• Voltage dividing ratio is 1000:1
• Measurement bandwidth 4MHz
• Identical gain and phase characteristics for each divider
• Phase error compensation with PW8001 (firmware version 1.3 or higher)
• Excellent frequency flatness needed for high‐efficiency inverter measurements

Applications

• Efficiency Evaluation of Inverters using SiC Power Devices such as Electrical Railways or Industrial Equipment
• Efficiency Evaluation of Solar Inverters that support High-Voltage Input
• Evaluation of Transformer Loss and Reactor Losses designed for Use in High-Voltage Circuits
• Efficiency Evaluation of Wireless Power Transfer Systems (WPT Systems)

Efficiency Evaluation of Inverters using SiC Power Devices such as Electrical Railways or Industrial Equipment

The VT1005 can be used e.g. with the HIOKI power analyzer PW8001 to measure the efficiency of inverters that use SiC power devices.
DUT: Engineers are striving to realize improvements on the order of 0.1 % in the effi ciency of inverters that use SiC power devices. High-effi ciency inverters convert to power using high-speed switching control. Active power on the output side of inverters includes the switching frequency as well as harmonic components of about 10× that frequency.
Measurement: To accurately measure efficiency, it’s essential to measure high-frequency components. The VT1005 can be used to measure a band ranging from DC to 4 MHz. In addition, it can measure amplitude error within 0.1 % from DC to 200 kHz.

Efficiency Evaluation of Solar Inverters that support High-Voltage Input

The VT1005 can be used e.g. with the HIOKI power analyzer PW8001 to measure the effi ciency of solar inverters that support high-voltage input.
DUT: Energy losses can be reduced by transmitting power at high voltages. Solar inverters with high-voltage input are increasingly being used to improve the effi ciency of power generating systems.
Measurement: Power analyzers are ideal for measuring conversion efficiency, but they cannot directly measure high voltages. The VT1005 allows power analyzers to measure voltages of up to 5000 V.

Evaluation of Transformer Loss and Reactor Losses designed for Use in High-Voltage Circuits

The VT1005 can be used e.g. with the HIOKI power analyzer PW8001 to measure loss in devices such as reactors and transformers.
DUT: Reactors and transformers are low power factor loads.
Measurement: When the power factor is low, phase error causes measurement error to increase. The VT1005 has defined phase correction values. Phase shift correction can be performed with the HIOKI power analyzer to allow measurement with a phase error of within ±0.1° from DC to 500 kHz.

Efficiency Evaluation of Wireless Power Transfer Systems (WPT Systems)

Wireless Power Transfer (WPT) System: Switching Frequency 85 kHz, Output Voltage 3000 V

The VT1005 can be used e.g. with the HIOKI Power Analyzer PW8001 to measure the effi ciency of wireless power transfer(WPT) systems.
DUT: Because they use a coil to transmit power, wireless power transfer (WPT) systems have transmission and reception components that operate at extremely low power factor values.
Measurement: When the power factor is low, phase error causes measurement error to increase. The VT1005 has defined phase correction values. Phase correction can be performed by the power analyzer to allow measurement with a phase error of within ±0.1° from DC to 500 kHz.

For more information, contact CN Rood.