Arc fault induced differential protection isolation
AssigneeHamilton Sundstrand Corporation
InventorsJoshua Berg, Jef William Good, John F. Defenbaugh
Life of this patent
Estimating the term…
Abstract
A method includes detecting an initial fault in a system and opening a contactor to isolate a load bus from the system for a window of time. During the window of time, the method includes detecting whether current flows from a generator of the system. If current flows from the generator of the system during the window of time, the method includes isolating the load bus from the generator. If current does not flow from the generator to the system during the window of time, the method includes isolating the load bus from all sources including the generator.
Claims15
A method comprising:
- detecting an initial fault in a system;
- opening a contactor to isolate a load bus from the system for a window of time;
- during the window of time, detecting whether current flows from a generator of the system;
- and
- if current flows from the generator of the system during the window of time, maintaining the load bus in an isolated state from the generator;
- and
- if current does not flow from the generator to the system during the window of time, isolating the load bus from a plurality of sources including the generator.
A system comprising:
- a generator;
- a generator feed line connected to the generator;
- a contactor selectively connecting between the generator feed line and a load bus;
- and
- a protection system connected to sense current generated by the generator and connected to control the contactor, wherein the protection system is configured for:
- detecting an initial fault in the system;
- opening the contactor to isolate the load bus from the system for a window of time;
- during the window of time, detecting whether current flows from the generator;
- and
- if current flows from the generator during the window of time, isolating maintaining the load bus in an isolated state from the generator;
- and
- if current does not flow from the generator to the system during the window of time, isolating the load bus from a plurality of sources including the generator.
Dependencies are inferred from the claim text.