Laminated core testing device

• US 7,605,592 B2
• Filed: 12/18/2003
• Issued: 10/20/2009
• Est. Priority Date: 03/12/2003
• Status: Active Grant

• Current Assignee: Siemens Energy Global GmbH & Co. KG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Baca, Matthias, Haschke, Peter, Twellmann, Hans-Bernd, Richter, Claus-Georg
• Primary Examiner(s): NATALINI, JEFF WILLIAM
• Application Number:
  US10/549,247
• Publication Number:
  US 20060219921A1
• Time in Patent Office: 2,133 Days
• Field of Search: 324/545
• US Class Current: 324/545
• CPC Class Codes: G01R 31/308 using non-ionising electromagnetic radiation, e.g. optical radiation investigating or analysing materials by the use of optical means G01N21/00; image analysis G06T7/00
• CPC Class Codes: G01R 31/34 Testing dynamo-electric machines
• CPC Class Codes: H02K 15/00 Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines

Abstract

A laminated core testing device for testing laminated cores in a generator is provided. The laminated core testing device includes an exciting winding situated parallel to a rotation axis of the generator and connected to a secondary alternating current generator, and further includes an infrared image acquisition device for acquiring infrared recordings. The secondary alternating current generator has a controllable frequency converter, and the secondary alternating current generator, at a frequency ranging from 400 Hz to 600 Hz, provides, in a single-phase manner, an output of 200 kW with a controllable output voltage ranging from 0 V to 3.0 kV.

Claims

1. A laminated core testing device to test a laminated core in a generator, comprising:

a field winding that lies in parallel with an axis of rotation of the generator and is connected to a high-voltage testing device that produces alternating current during a test to simulate an operational state of the generator; and

an infrared image detection device that is designed to detect infrared radiation during the simulated operational state of the generator;

wherein the high-voltage testing device is configured to simulate the operational state of the generator by outputting a fundamental frequency and a power in single-phase form at an output voltage of at least 400 V that can be regulated, wherein the high-voltage testing device comprises a frequency converter for converting the fundamental frequency to a frequency that is greater than 50 Hz to energize the field winding at the greater frequency value and cause a thermal response indicative of at least one hot spot in the laminated core during the simulated operational state of the generator.

2. The laminated core testing device as claimed in claim 1, wherein the high-voltage testing device has an input side which can be connected to a three-phase power supply.

3. The laminated core testing device as claimed in claim 2, wherein the three-phase power supply has a three-phase 400 V AC voltage.

4. The laminated core testing device as claimed in claim 1, wherein the high-voltage testing device makes available the electrical power at a frequency of greater than 400 Hz.

5. The laminated core testing device as claimed in claim 1, wherein the field winding comprises at least two lines.

6. The laminated core testing device as claimed in claim 1, wherein the high-voltage testing device is in the form of a transportable device.

7. A high-voltage testing device for testing a laminated core in a generator, comprising:

a single-phase output signal that can be regulated during a test to simulate an operational state of the generator; and

an output voltage of at least 400 V having a fundamental frequency, wherein the high-voltage testing device comprises a frequency converter for converting the fundamental frequency to a frequency that is greater than 50 Hz to simulate the operational state of the generator, wherein a field winding is energized at the greater frequency value to cause during the simulated operational state of the generator a thermal response indicative of at least one hot spot in the laminated core, wherein the thermal response is detected by an infrared image detection device configured to detect infrared radiation during the simulated operational state of the generator.

8. The high-voltage testing device as claimed in claim 7, further comprising an input side that can be connected to a three-phase power supply.

9. The high-voltage testing device as claimed in claim 8, wherein the input side can be connected to a three-phase 400 V AC voltage.

10. The high-voltage testing device as claimed in claim 7, wherein electrical power at a frequency of greater than 400 Hz is made available.

11. A method for testing for faults in a laminated core of a generator, comprising:

producing alternating current via a high-voltage testing device during a test to simulate an operational state of the generator;

connecting the high-voltage testing device during the simulated operational state of the generator to a field winding that lies in parallel with an axis of rotation of the generator;

detecting and recording infrared beams in the direction of the axis of rotation using an infrared image detection device;

making available power in a single phase form via the high-voltage testing device at a fundamental frequency and at an output voltage of at least 400 V that can be regulated;

converting the fundamental frequency to a frequency that is greater than 50 Hz;

energizing the field winding at the greater frequency value to cause a thermal response indicative of at least one hot spot in the laminated core; and

inspecting a detected infrared recording for said at least one hot spot obtained during the simulated operational state of the generator, said at least one hot spot pointing towards faults in the laminated core of the generator.