An On-line Over-voltage Monitoring Device Based On Virtual Instrument And Optical Voltage Sensor

In this paper we bring forward a new method of transient over-voltage monitoring for substation. The system is made up of an optical voltage sensor, a high-speed data acquire board and a computer. We devised a system for analyzing over-voltage data by LabVIEW. The analyses include calculating all parameters of once over-voltage, statistics of over-voltages and distinguishing the type of once over-voltage. In this system, we monitor over-voltage by optical voltage sensor. Optical voltage sensor is a new kind of voltage measuring appliance, which measure voltage by crystal electro optic effect (Pockels effect) and transmit data through optical fiber. And we get the data by a high speed data acquire board PCI-9812. The board has 4 20MHz A/D converters, one converter for each analog channel and 32K FIFO memory, so it can transfer data with four channels synchronously. There are many facts proof that this system can satisfy the requirement of over-voltage monitoring. And it will be applied in practical operation.