Power terminal protection device
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorYung K. Yi
Life of this patent
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Abstract
Metal oxide varistors are connected in parallel with grounded capacitors to oad outlet terminals coupled to a power source through inductor coils forming a low pass filter with the capacitors to delay propagation of a voltage increasing transient pulse to the power source until ground shunting paths of low resistance are developed in the varistors. Electromagnetic shielding partitions the inductor from the capacitors and varistors within a power outlet box mounting the load outlet terminals to prevent interference with absorption of transient energy by the varistors during the delay in establishing the ground shunting paths.
Claims10
In combination with an electrical power source and an outlet device having power terminal means for transferring voltage thereat to a load and inductance means coupling the source to the power terminal means for regulating increase in current conducted therebetween;
- transient suppression means for protecting the source from transient voltage above a threshold level at the power terminal means including:
- capacitor means connected to the inductance means for delaying supply of the transient voltage to the source, impedance means connected in parallel relation to the capacitor means for development of a shunt path in response to said transient voltage at the power terminal means, and shielding means electromagnetically separating the inductance means from the capacitor means for preventing interference with absorption of transient energy by the impedance means during said development of the shunt path.
In combination with an electrical power source and an outlet device having power terminal means for transferring voltage thereat to a load and inductance means coupling the source to the power terminal means for regulating increase in current conducted therebetween;
- transient suppression means for protecting the source from transient voltage above a threshold level at the power terminal means including:
- capacitor means connected to the inductance means for supply of the transient voltage to the source delayed by a predetermined period of time, impedance grounding means connected to the inductance means in parallel relation to the capacitor means for decreasing resistance to ground during said predetermined period of time in response to the transient voltage at the power terminal means, a housing mounting the outlet device and shielding means electrically partitioning the inductance means from the capacitor and impedance means within the housing.
Dependencies are inferred from the claim text.