The ultrasonics method has shown some drawbacks in detecting high-voltage equipment PD.In order to eliminate or aroid these problems

the author introduced the principle of optical fiber sensor

the fitness of its application to high voltage equipment insulation monitoring and test

and the practical application of three kinds of optical fiber sensors based on Fabry-perot

Mach-zehnder and Michelson interferometries to high voltage equipment.The outstanding problems are put forward

and the development tendency of the acousto-optical partial discharge detection for high voltage equipment is forecasted.Testing and practical application research shows that the use of acusto-optical detection and loation of PD which realized by the fiber-optic technology to achieve high voltage electrical equipment insulation monitoring is entirely feasible.