OVERVOLTAGE PROTECTION DEVICE Russian patent published in 1997 - IPC

FIELD: electrical engineering, in particular, overvoltage protection devices. SUBSTANCE: the device has insulating casing 1 accommodating parallel columns 2 of a highly nonlinear resistor, secured on the internal surface of additional cylinder 3 with gap 4 between casing 1 and additional cylinder 3. Installed inside cylinder 3 is main insulating cylinder 5 with central gas outlet duct 6. Gap 4 and space 7 are filled with electrical insulating heat conducting loose material 8. Mechanical strength of cylinder 3 is selected by cylinder 5. Cylinder 5 is made of elastic sheet material rolled up in overlap and installed in-between the columns of highly nonlinear resistors. Additional insulating cylinder 3 is made of material, whose thermal conductivity is equivalent to thermal conductivity the internal surface of additional insulating cylinder 3. EFFECT: enhanced reliability due to enhanced explosion - proofness. 4 cl, 2 dwg