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In order to substitute for the conventional measuring system which could bring about technical inconveniences, measuring technique for the fast transient high voltages upto 300 kV and small signals less than 1 V are developed by use of laser with Pockels cell. For the former, capacitive voltage divider was specially designed for reducing the impulse voltage less than the half-wave voltage of Pockels cell. For the latter, interferometer type was employed as a mean to removing the fluctuation of laser output intensity which is known to be the limits for small signal measurement. And also the main beam through the Pockels cell and the reference beam from the laser source are separated before being detected respectively by photo diodes. And then, these two signals are amplified and compared for detecting only the small signals applied across the Pockels cell. Throughout this work, laser-based measuring system is likely to enable us, at this moment, to detect correctly lightning impulse voltages upto 250 kV and the small signals less than 1 V upto the 2 MHz. Such a system could be employed as a possible diagnostic measuring system at the substation.

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Abstract

Ⅰ. Introduction

Ⅱ. Experiments

Ⅲ. Results and Discussion

Ⅳ. Conclusion

References

Acknowledgement

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UCI(KEPA) : I410-ECN-0101-2009-569-017763758