Circuit interrupter trip apparatus and method

• US 8,749,327 B2
• Filed: 09/18/2008
• Issued: 06/10/2014
• Est. Priority Date: 09/18/2008
• Status: Active Grant

• Current Assignee: ABB Schweiz AG (ABB Limited)
• Original Assignee: General Electric Company
• Inventors: Harmon, Jason Edward
• Primary Examiner(s): Rojas, Bernard
• Application Number:
  US12/233,262
• Publication Number:
  US 20100066470A1
• Time in Patent Office: 2,091 Days
• Field of Search: 335/6, 335/13
• US Class Current: 335/13
• CPC Class Codes: H01H 2083/201 the other abnormal electrical condition being an arc fault
• CPC Class Codes: H01H 2083/203 with shunt trip circuits, e.g. NC contact in an undervoltage coil circuit
• CPC Class Codes: H01H 71/40 Combined electrothermal and electromagnetic mechanisms
• CPC Class Codes: H01H 71/46 having means for operating auxiliary contacts additional to the main contacts

Abstract

A circuit interrupter trip apparatus operably connected to an operating mechanism of a circuit interrupter includes a sensor and a switch operably connected and responsive to the sensor. The switch is positioned such that the sensor changes the operating state of the switch in response to detection of a predetermined electrical condition, such as an electrical fault. A controller is operably connected to the switch and is configured to activate the operating mechanism in response to a change in the operating state of the switch.

Claims

1. A circuit interrupter trip apparatus operably connected to an operating mechanism of a circuit interrupter, the trip apparatus comprising:

a sensor;

a microswitch operably connected and responsive to the sensor, said sensor configured to change the operating state of the switch in response to detection of a predetermined electrical condition; and

a computer controller configured and disposed to receive and execute computer executable instructions, the controller being operably connected to the switch and configured to activate the operating mechanism in response to a change in the operating state of the switch.

2. The trip apparatus of claim 1 wherein the sensor is an electro-mechanical sensor having a mechanical output arranged to change the operating state of the microswitch in response to a predetermined value of the current being exceeded.

3. The trip apparatus of claim 2 wherein the electro-mechanical sensor is a solenoid connected to a line conductor and responsive to a current of the line conductor such that the mechanical output facilitates a change in the operating state of the microswitch in response to a predetermined value of the current being exceeded.

4. The trip apparatus of claim 3 wherein the solenoid facilitates a change in the operating state of the microswitch to OFF in response to a predetermined value of the current being exceeded.

5. The trip apparatus of claim 3 wherein the solenoid facilitates a change in the operating state of the microswitch to ON in response to a predetermined value of the current being exceeded.

6. The trip apparatus of claim 1 wherein the sensor is a thermal sensor arranged to change the operating state of the switch in response to a predetermined condition.

7. The trip apparatus of claim 6 wherein the thermal sensor is a bimetal connected to a line conductor such that the bimetal facilitates a change in the operating state of the switch in response to a predetermined value of current magnitude through the bimetal being exceeded for a predetermined amount of time.

8. The trip apparatus of claim 1 wherein the sensor is an arc flash detector arranged to change the operating state of the switch in response to an arc flash event.

9. A circuit interrupter comprising:

a first electrical contact;

a second electrical contact disposed in separable communication with the first electrical contact;

an operating mechanism disposed and configured to selectively open and close the first and second electrical contacts;

a first trip device operably connected to the operating mechanism to activate the operating mechanism in response to at least one first condition being met; and

a second trip device operably connected to the operating mechanism to activate the operating mechanism in response to at least one second condition being met, the second trip device comprising;

a computer controller configured and disposed to receive and execute computer readable instructions, the controller being configured to issue a trip command;

a microswitch having at least two operating states, the switch being in electrical communication with the controller;

a sensor disposed and configured to change the operating state of the switch in response to detecting a predetermined electrical condition, the predetermined electrical condition being an at least one second condition;

an actuator operably connected to the controller and the operating mechanism, the actuator disposed and configured to activate the operating mechanism in response to the trip command from the controller; and

wherein the controller is configured to issue the trip command to the actuator in response to the change in the operating state of the switch.

10. The circuit interrupter of claim 9 wherein the sensor is an electro-mechanical sensor having a mechanical output disposed and configured to change the operating state of the microswitch in response to a predetermined electrical condition.

11. The circuit interrupter of claim 10 wherein the electro-mechanical sensor is a solenoid operably connected to one of the line conductor and the load conductor and responsive to a current thereof such that when the current exceeds a predetermined value, the mechanical output changes the operating state of the microswitch.

12. The circuit interrupter of claim 11 wherein the plunger changes the operating state of the microswitch to ON in response to a predetermined value of the current being exceeded.

13. The circuit interrupter of claim 9 wherein the sensor is a thermal sensor arranged to change the operating state of the switch in response to a predetermined condition.

14. The circuit interrupter of claim 13 wherein the thermal sensor is a bimetal connected to a line conductor such that the bimetal facilitates a change in the operating state of the switch in response to a predetermined value of current magnitude through the bimetal being exceeded for a predetermined amount of time.

15. The circuit interrupter of claim 9 wherein the sensor is an arc flash detector arranged to change the operating state of the switch in response to an arc flash event.

16. A circuit interrupter trip method comprising:

providing a sensor;

providing a microswitch;

providing a computer controller configured to receive and execute computer readable instructions;

connecting the microswitch to the computer controller;

configuring the sensor to change an operating state of the microswitch when a predetermined condition is detected;

monitoring the operating state of the microswitch with the computer controller; and

activating an operating mechanism of a circuit interrupter with the computer controller when the operating state of the microswitch changes.

17. The method of claim 16 wherein providing a sensor comprises providing an electro-mechanical sensor.

18. The method of claim 16 wherein providing a sensor comprises providing a thermal sensor arranged to change the operating state of the switch in response to a predetermined condition.

19. The method of claim 16 wherein providing a sensor comprises providing an arc flash detector arranged to change the operating state of the switch in response to an arc flash event.