Isolated voltage probe for power electronics and high voltage use

13-04-2022 | Saelig | Power

Saelig Company now offers the availability of the Saker-MV ISOVP Probe - a novel voltage probe that facilitates high voltage isolated measurements through fibre optic cables. Optical fibre isolation provides high voltage safety and increased signal integrity due to the absence of induced interference from external fields. This also allows for much higher common-mode rejection than conventional differential probes. The probe head can be remotely put on standby or even powered off for increased user safety and battery power savings. The user, therefore, does not need to reach into possibly hazardous high voltage areas to turn off the equipment when measurements are not required. Up to 15m of fibre cable can be fitted between the probe head and receiver. The probe employs standard 1.5V AA batteries with LEDs to indicate low battery conditions.

The probe has been developed with minimal input capacitance to enable high-frequency measurements. Typical analog optical links are prone to minor power variations due to connector mismatches, temperature drifts, and offsets. The device employs a proprietary algorithm to calibrate the link and eradicate those errors. This increases overall accuracy in comparison to other optical equipment and saves setup time.

It can perform “hot” calibrations with no input disconnect, making it unneeded to access the high voltage area throughout operation. This means saved time and increased user safety. Another helpful feature puts the probe system on standby or turns off the probe head from the receiver so that the user does not need access to areas that can be at high voltage throughout tests. Most high-end oscilloscopes offer proprietary input connectors that force the user to select the manufacturer’s supplied accessories of the scope, however, the probe can be used with any 50Ohm terminated oscilloscope. This gives developers the freedom to employ their digital scope of choice and contain investment costs. The probe head provides a standard camera tripod mount thread. This makes it more convenient to put the probe inside tightly spaced cabinets or power modules to keep proper clearance distances.

Applications include power electronics, multi-level power inverters (CHB, NPC, FC), floating sensor outputs, EMC/ESD measurements, differential measurements, high voltage research, partial discharge measurements, wind and EV power systems, and more.

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