Insulation diagnostic system or rotating machine

Patent metadata

Field	Value
Publication number	US-10067190-B2
Application number	US-201415501250-A
Country	US
Kind code	B2
Filing date	Sep 8, 2014
Priority date	Sep 8, 2014
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

An object is to conduct an insulation degradation diagnosis with a simple configuration. An insulation diagnostic system includes a current detection sensor 4a that is installed, for a coil 3a of at least one phase of a Δ connection type rotating machine in which current flows in the reverse direction at a winding start position and a winding end position, such that the current detection sensor 4a surrounds a current path flowing into a leader line at the winding start of the coil 3a and a current path flowing out from a leader line at the winding end of the coil 3a.

First claim

The invention claimed is:

1. An insulation diagnostic system comprising:
a current detection sensor, the current detection sensor being installed, for a first coil of at least one phase of a Δ connection type rotating machine in which current flows in the reverse direction at a winding start of the first coil and a winding end of the first coil, such that the current detection sensor surrounds a current path flowing into a leader line at the winding start of the first coil and a current path flowing out from a leader line at the winding end of the first coil,
wherein the leader line at the winding end of the first coil and a leader line at a winding start of a second coil of a phase different from that of the first coil of the rotating machine are electrically connected outside the rotating machine.

2. The insulation diagnostic system according to claim 1 , further comprising:
a first terminal which is connected to the leader line at the winding end of the first coil,
a second terminal which is connected to the leader line at the winding start of the second coil, and
a third terminal which electrically connects the first terminal and the second terminal.

3. The insulation diagnostic system according to claim 2 , wherein each one of the terminals is provided on a surface of the rotating machine.

4. The insulation diagnostic system according to claim 1 , wherein the current detection sensor is installed to each phase.

5. The insulation diagnostic system according to claim 1 , further comprising:
a current analyzer connected to the current detection sensor and configured to frequency convert signals measured by the current detection sensor.

6. The insulation diagnostic system according to claim 1 , further comprising:
a voltage detection sensor installed on at least one of the current path flowing into the leader line at the winding start of the first coil and the current path flowing out from the leader line at the winding end of the first coil.

7. The insulation diagnostic system according to claim 6 , further comprising:
a voltage analyzer configured to frequency convert signals measured by the voltage detection sensor.

8. The insulation diagnostic system according to claim 1 , wherein the current detection sensor is a through-type current detection sensor, a clamp type current detection sensor, a split type current detection sensor, or a combination of any of the through-type current detection sensor, the clamp type current detection sensor, and the split type current detection sensor.

9. The insulation diagnostic system according to claim 1 ,
wherein the first coil and the second coil are provided in a rotator or a stator of the Δ connection type rotating machine.

10. An insulation diagnostic system, comprising:
a current detection sensor, the current detection sensor being installed, for a first coil of at least one phase of a Δ connection type rotating machine in which current flows in the reverse direction at a winding start of the first coil and a winding end of the first coil, such that the current detection sensor surrounds a current path flowing into a leader line at the winding start of the first coil and a current path flowing out from a leader line at the winding end of the first coil,
wherein the leader line at the winding end of the first coil and a leader line at a winding start of a second coil of a phase different from that of the first coil of the rotating machine are electrically connected inside the rotating machine.

11. The insulation diagnostic system according to claim 10 , further comprising:
a first terminal which is connected to the leader line at the winding end of the first coil,
a second terminal which is connected to the leader line at the winding start of the second coil, and
a third terminal which electrically connects the first terminal and the second terminal.

12. The insulation diagnostic system according to claim 11 , wherein each one of the terminals is provided on a surface of the rotating machine.

13. The insulation diagnostic system according to claim 10 , wherein the current detection sensor is installed to each phase.

14. The insulation diagnostic system according to claim 10 , further comprising:
a current analyzer connected to the current detection sensor and configured to frequency convert signals measured by the current detection sensor.

15. The insulation diagnostic system according to claim 10 , further comprising:
a voltage detection sensor installed on at least one of the current path flowing into the leader line at the winding start of the first coil and the current path flowing out from the leader line at the winding end of the first coil.

16. The insulation diagnostic system according to claim 15 , further comprising:
a voltage analyzer configured to frequency convert signals measured by the voltage detection sensor.

17. The insulation diagnostic system according to claim 10 , wherein the current detection sensor is a through-type current detection sensor, a clamp type current detection sensor, a split type current detection sensor, or a combination of any of the through-type current detection sensor, the clamp type current detection sensor, and the split type current detection sensor.

18. The insulation diagnostic system according to claim 10 ,
wherein the first coil and the second coil are provided in a rotator or a stator of the Δ connection type rotating machine.

19. An insulation diagnostic system comprising:
a current detection sensor, the current detection sensor being installed, for a first coil of at least one phase of a Δ connection type rotating machine in which current flows in the reverse direction at a winding start position of the first coil and a winding end of the first coil, such that the current detection sensor surrounds a current path flowing into a leader line at the winding start of the first coil and a current path flowing out from a leader line at the winding end of the first coil; and
a current analyzer connected to the current detection sensor and configured to frequency convert signals measured by the current detection sensor.

20. An insulation diagnostic system comprising:
a current detection sensor, the current detection sensor being installed, for a first coil of at least one phase of a Δ connection type rotating machine in which current flows in the reverse direction at a winding start of the first coil and a winding end of the first coil, such that the current detection sensor surrounds a current path flowing into a leader line at the winding start of the first coil and a current path flowing out from a leader line at the winding end of the first coil; and
a terminal block that accommodates terminals which connect to the winding start and the winding end of the first coil, and is disposed outside the rotating machine, and the current detection sensor is disposed in the terminal block.

21. The insulation diagnostic system according to claim 20 ,
wherein the first coil and the second coil are provided in a rotator or a stator of the Δ connection type rotating machine.

Assignees

• Hitachi Ltd

Inventors

• Kato Tetsuji
• Maki Kohji

Classifications

• G01R31/346

  Testing of armature or field windings · CPC title

• H02K11/27

  Devices for sensing current, or actuated thereby (overcurrent protection responsive to temperature of the machines or parts thereof, e.g. windings, H02K11/25) · CPC title

• G01R31/34 Primary

  Testing dynamo-electric machines · CPC title

• G01R31/343

  in operation · CPC title

• H02K11/20 Primary

  for measuring, monitoring, testing, protecting or switching (rectifiers H02K11/04; power electronics H02K11/33) · CPC title