Hitachi Zosen Corporation

Yutaka Isawa

Hidehiko Maehata

Daisuke Tamakoshi

Masanori Tsukahara

Tomohiko Suzaki

An electric screen device for preventing creatures from intruding into a water channel, which comprises a pair of opposed electrode assemblies disposed on opposite sides of a water intake channel, and a dc pulse applying device for applying dc pulses between the electrode assemblies. In such electric screen device, the product of the peak value of the intensity of an electric field produced between the electrode assemblies by the dc pulse applying device and the body length of creatures to be prevented from intrusion into the water channel is not less than 0.1 V, the dc pulse applying time is within the range of 2-200 msec, and the duty factor of the dc pulse is not more than 0.5.

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Osaka, Japan

Yutaka Isawa