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US 11,626,720 B1Granted
Multiphase ground fault circuit interrupter
AssigneeNeilsen-Kuljian, Inc.
InventorsHuy D. Nguyen, Tom Lik-Chung Lee
Life of this patent
Estimating the term…
Abstract
A multiphase ground fault circuit interrupter includes a first phase power line input, a second phase power line input, a third phase power line input, a neutral line input, a controller circuit having a relay control output, a first phase latching relay having a first phase switch input coupled to the first phase power line input and a first phase relay control input coupled to the relay control output of the controller circuit, a sensor having a core and a sensor pickup coupled to the controller circuit, and a first phase load wire coupled to a first phase switch output of the first phase latching relay and passed through the core.
Claims16
A multiphase ground fault circuit interrupter comprising:
- a first phase power line input;
- a second phase power line input;
- a third phase power line input;
- a neutral line input;
- a controller circuit having a relay control output;
- a first phase latching relay having a first phase switch input coupled to the first phase power line input and a first phase relay control input coupled to the relay control output of the controller circuit;
- a second phase latching relay having a second phase switch input coupled to the second phase power line input and a second phase relay control input coupled to the relay control output of the controller circuit;
- a third phase latching relay having a third phase switch input coupled to the third phase power line input and a third phase relay control input coupled to the relay control output of the controller circuit;
- a sensor having a core and a sensor pickup coupled to the controller circuit;
- a first phase load wire coupled to a first phase switch output of the first phase latching relay and extending through the core;
- a second phase load wire coupled to a second phase switch output of the second phase latching relay and extending through the core;
- and
- a third phase load wire coupled to a third phase switch output of the third phase latching relay and extending through the core.
10 more elements
A multiphase ground fault circuit interrupter comprising;
- a first phase power line input;
- a second phase power line input;
- a third phase power line input;
- a neutral line input;
- a controller circuit having a relay control output;
- a first phase latching relay having a first phase switch input coupled to the first phase power line input and a first phase relay control input coupled to the relay control output of the controller circuit;
- a sensor having a core and a sensor pickup coupled to the controller circuit;
- a first phase load wire coupled to a first phase switch output of the first phase latching relay and extending through the core;
- a neutral latching relay having a neutral switch input coupled to the neutral line input and a neutral latching relay control input coupled to the relay control output of the controller circuit;
- and
- a neutral load wire coupled to a neutral switch output of the neutral line latching relay and extending through the core;
- wherein the relay control output of the controller circuit includes a Reset (R) output and a Set (S) output, the first phase relay control input includes an R input coupled to the R output and an S input coupled to the S output, and the neutral latching relay control input includes an R input coupled to the R output and an S input coupled to the S output, whereby the R output of the controller circuit resets both the first phase latching relay and the neutral latching relay, and the S output of the controller circuit set both the first phase latching relay and the neutral latching relay.
9 more elements
A method for multiphase ground fault protection comprising:
- coupling a first phase power line to a first phase load wire with a first phase latching relay, wherein the first phase load wire extends through a core having a sensor pickup coupled to a controller circuit having a relay control output, wherein the first phase latching relay includes a first phase switch input coupled to a first phase power line input, a first phase switch output coupled to the first phase load wire, and a first phase relay control input coupled to the relay control output of the controller circuit;
- coupling a second phase power line to a second phase load wire with a second phase latching relay, wherein the second phase load wire extends through the core and wherein the second phase latching relay includes a second phase switch input coupled to a second phase power line input, a second phase switch output coupled to the second phase load wire, and a second phase relay control input coupled to the relay control output of the controller circuit;
- coupling a third phase power line to a third phase load wire with a third phase latching relay, wherein the third phase load wire extends through the core and wherein the third phase latching relay includes a third phase switch input coupled to a third phase power line input, a third phase switch output coupled to the third phase load wire, and a third phase relay control input coupled to the relay control output of the controller circuit,
- detecting a ground fault between at least one of the first phase load wire, the second phase load wire, and the third phase load wire and ground;
- and
- disconnecting the first phase load wire, the second phase load wire, and the third phase load wire from the first phase power line input, the second phase power line input, and the third phase power line input by tripping the first phase latching relay, the second phase latching relay and the third phase latching relay.
3 more elements
Dependencies are inferred from the claim text.