Protection method for a generator

Patent metadata

Field	Value
Publication number	US-9641112-B2
Application number	US-201414566273-A
Country	US
Kind code	B2
Filing date	Dec 10, 2014
Priority date	Dec 10, 2014
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

A power source includes a generator configured to receive mechanical energy and convert the mechanical energy to an electrical output. The generator includes a rotor and a stator. The stator has a first coil and a second coil. The first coil and the second coil are selectively arranged in a first configuration to provide the electrical output at a first voltage level and in a second configuration to provide the electrical output at a second voltage level. The power source also includes a detection circuit including a sensing relay. The detection circuit is configured to generate an output based on whether the first coil and the second coil are arranged in the first configuration or in the second configuration.

First claim

What is claimed is:

1. A power source comprising:
a generator configured to receive mechanical energy and convert the mechanical energy to an electrical power output, the generator including a rotor and a stator, the stator having a first coil and a second coil, the first coil and the second coil selectively arranged in a first configuration to provide the electrical power output at a first level and in a second configuration to provide the electrical power output at a second level; and
a detection circuit including a sensing relay, and configured to generate an indication output based on whether the first coil and the second coil are arranged in the first configuration or in the second configuration.

2. The power source of claim 1 , further comprising a protection device coupled to the generator and configured to inhibit the generator from providing the electrical power output based on a protection parameter, wherein the protection parameter is determined based on the indication output from the detection circuit.

3. The power source of claim 2 , wherein the protection device includes a circuit breaker configured to disconnect the generator from a load to inhibit the generator from providing the electrical power output when the protection parameter is exceeded.

4. The power source of claim 2 , wherein the protection parameter is unique for each configuration in which the first coil and the second coil are selectively arranged.

5. The power source of claim 1 , wherein the sensing relay is coupled to at least one of the first coil and the second coil; and configured to detect a voltage from the at least one of the first coil and the second coil, and generate a signal based on the detected voltage.

6. The power source of claim 1 , wherein the stator includes a third coil, a fourth coil, a fifth coil, and a sixth coil, wherein the first coil, second coil, third coil, fourth coil, fifth coil, and sixth coil are selectively arranged in the first configuration to provide the electrical power output at the first voltage level, the second configuration to provide the electrical power output at the second voltage level, and a third configuration to provide the electrical power output at a third voltage level.

7. The power source of claim 6 , wherein the first coil, the second coil, the third coil, the fourth coil, the fifth coil, and the sixth coil are selectively arranged in the third configuration to selectively provide the electrical power output at the third voltage level and a fourth voltage level.

8. The power source of claim 1 , wherein the sensing relay is a first sensing relay coupled to at least one of the first coil or the second coil to detect a first voltage and generate a first signal based on the detected first voltage, and wherein the detection circuit further includes a second sensing relay coupled to at least one of the first coil and the second coil to detect a second voltage and generate a second signal based on the detected second voltage.

9. The power source of claim 8 , wherein the first sensing relay is further coupled to a switch, the switch configured to modify the first signal when the switch is activated.

10. The power source of claim 1 , wherein the detection circuit includes a switch, the switch configured to modify a signal generated by the sensing relay when the switch is activated.

11. The power source of claim 10 , wherein the switch is coupled to a voltage output selector that is movable between a first position in which the switch does not modify the first signal, and a second position in which the switch modifies the first signal.

12. A method of protecting a power source having a generator that includes a rotor and a stator, the stator including a first coil and a second coil, the method comprising:
receiving, at the generator, mechanical energy;
converting, by the generator, mechanical energy to an electrical power output;
selectively arranging the first coil and the second coil in one of the group including a first configuration and a second configuration;
providing, by the generator, the electrical power output at a first voltage level when the first coil and the second coil are arranged in the first configuration;
providing, by the generator, the electrical power output at a second voltage level when the first coil and the second coil are arranged in the second configuration; and
generating, by a detection circuit, an indication output based on whether the first coil and the second coil are arranged in the first configuration or in the second configuration, wherein the detection circuit includes a sensing relay.

13. The method of claim 12 , further comprising determining a protection parameter based on the indication output from the detection circuit; and inhibiting, by a protection device, the generator from providing the electrical power output based on the protection parameter.

14. The method of claim 13 , wherein inhibiting the generator from providing the electrical power output includes disconnecting, by a circuit breaker included in the protection device, the generator from a load to inhibit the generator from providing the electrical power output when the protection parameter is exceeded.

15. The method of claim 13 , wherein the protection parameter is unique for each configuration in which the first coil and the second coil are selectively arranged.

16. The method of claim 12 , wherein generating an indication output, by the detection circuit, based on whether the first coil and the second coil are arranged in the first configuration or in the second configuration, includes detecting, at the sensing relay, a voltage associated with at least one of the group including the first coil and the second coil, and wherein the sensing relay is coupled to at least one of the first coil and the second coil.

17. The method of claim 12 , wherein the stator includes a third coil, a fourth coil, a fifth coil, and a sixth coil; wherein selectively arranging the first coil and the second coil includes selectively arranging the first coil, the second coil, the third coil, the fourth coil, the fifth coil, and the sixth coil in the first configuration to provide the electrical power output at the first voltage level, the second configuration to provide the electrical power output at the second voltage level, and a third configuration to provide the electrical power output at a third voltage level.

18. The method of claim 17 , wherein selectively arranging the first coil, the second coil, the third coil, the fourth coil, the fifth coil, and the sixth coil in the third configuration provides the electrical power output at one of the third voltage level and a fourth voltage level.

19. The method of claim 12 , wherein the sensing relay is a first sensing relay coupled to at least one of the group including the first coil and the second coil, and wherein generating an indication output based on which configuration the first coil and the second coil are arranged, includes detecting a first voltage, at the first sensing relay, from the at least one of the group including the first coil and the second coil; and generating, by the first sensing relay, a first signal based on the detected first voltage; detecting a second voltage, at a second sensing relay, from at least one of the group including the first coil and the second coil; and generating, by the second sensing relay, a second signal based on the detected second voltage, wherein the second sensing relay is coupled to at least one of the group including the first coil and the se

Assignees

• Clark Equipment Co

Inventors

• Harknett Nicholas
• Herbstritt Dale

Classifications

• H02H3/08

  responsive to excess current (responsive to abnormal temperature caused by excess current H02H5/04) · CPC title

• H02H7/06

  for dynamo-electric generators; for synchronous capacitors · CPC title

• H02K3/28

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• H02P9/006 Primary

  Means for protecting the generator by using control (control effected upon generator excitation circuit to reduce harmful effects of overloads or transients H02P9/10) · CPC title

• H02H3/20

  responsive to excess voltage · CPC title