INTERNAL FAULT INDICATOR FOR POWER ELECTRICAL DEVICES

摘要

Internal fault indicator for an electric device according to the invention is activated by the rapid increase in pressure, which is caused if the insulation fault to generate an electric arc. The heat release from the arc is transferred to the peripheral volume leads to local overheating, evaporation, and decomposition of the insulation material. As a result, to move the rapid increase of the pressure causes the diaphragm. By the diaphragm is moved, is released from the barrel is a plunger driven by a spring that extends through the housing of the electrical device. Prior to activation, the plunger is held in the "standby" position by the retaining pin. When activated, the plunger 0194 until it provides a visual signal of an internal fault so as to protrude from the housing, is pushed by a spring. A pressure relief valve may be incorporated in the internal fault indicator.