Field winding interlayer short-circuit monitoring device and field winding interlayer short-circuit monitoring method

Patent metadata

Field	Value
Publication number	US-12407282-B2
Application number	US-202418402437-A
Country	US
Kind code	B2
Filing date	Jan 2, 2024
Priority date	Mar 22, 2023
Publication date	Sep 2, 2025
Grant date	Sep 2, 2025

Abstract

According to an embodiment, a field winding interlayer short-circuit monitoring device comprises: an input unit configured to obtain field winding current values and field winding voltage values at a predetermined sampling cycle; a memory configured to store field winding resistance versus current characteristic curves at an abnormal state and a normal state; and a field winding resistance calculator configured to calculate a field winding resistance value by dividing the field winding voltage value by the field winding current; an average value calculator configured to calculate an average resistance value and an average current value by averaging those obtained during a predetermined time interval; and an image data generator configured to generate image data to display a predetermined number of average value data along with the field winding resistance versus current characteristic curves at the normal state and the abnormal state.

First claim

What is claimed is:

1. A field winding interlayer short-circuit monitoring device for a rotary electric machine, the device comprising:
an input unit configured to obtain field winding current values and field winding voltage values from the rotary electric machine at a predetermined sampling cycle;
a memory configured to store a plurality of first field winding resistance versus current characteristic curves in an abnormal state with interlayer short-circuits and a second field winding resistance versus current characteristic curve in a normal state without interlayer short-circuit, each of the plurality of the first field winding resistance versus current characteristic curves being with different interlayer short-circuits from each other;
a field winding resistance calculator configured to calculate a field winding resistance value by dividing each of the obtained field winding voltage values by each of the obtained field winding current values;
an average value calculator configured to calculate an average resistance value and an average current value by averaging the field winding resistance values and the field winding current values obtained during a predetermined time interval respectively; and
an image data generator configured to generate image data to display a predetermined number of average value data each composed of the average resistance value and the average current value along with the plurality of the first field winding resistance versus current characteristic curves in the abnormal state and the second field winding resistance versus current characteristic curve in the normal state.

2. The field winding interlayer short-circuit monitoring device according to claim 1 , wherein
the image data generator generates a latest performance image data including a latest average value data and a predetermined number of consecutive average value data preceding the latest average value data as an average value data group.

3. The field winding interlayer short-circuit monitoring device according to claim 1 , wherein
the image data generator generates a past performance image data as the image data by using the average value data for a selected past period as an average value data group.

4. The field winding interlayer short-circuit monitoring device according to claim 3 , wherein
the image data generator divides the average value data group into regions of the field winding current values and generates the past performance image data displaying representative values in each region.

5. The field winding interlayer short-circuit monitoring device according to claim 4 , wherein
the representative value is at least one of a maximum, average, intermediate, and minimum values of the average value data in the region of the field winding current value.

6. The field winding interlayer short-circuit monitoring device according to claim 1 , wherein
the field winding resistance value is corrected based on differences of at least one of temperature, pressure, and purity of cooling gas inside the rotary electric machine with respect to a reference value for the at least one of temperature, pressure, and purity of cooling gas inside the rotary electric machine.

7. A field winding interlayer short-circuit monitoring method for a rotary electric machine, the method comprising:
a step for an input unit of obtaining field winding current values and field winding voltage values from the rotary electric machine at a predetermined sampling cycle;
a step for a memory of storing a plurality of first field winding resistance versus current characteristic curves in an abnormal state with interlayer short-circuits and a second field winding resistance versus current characteristic curve in a normal state without interlayer short-circuit, each of the plurality of the first field winding resistance versus current characteristic curves being with different interlayer short-circuits from each other; and
a step for a field winding resistance calculator of calculating a field winding resistance value by dividing each of the obtained field winding voltage values by each of the obtained field winding current values;
a step for an average value calculator of calculating an average resistance value and an average current value by averaging the field winding resistance values and the field winding current values obtained during a predetermined time interval respectively; and
a step for an image data generator of generating image data to display a predetermined number of average value data each composed of the average resistance value and the average current value along with the plurality of the first field winding resistance versus current characteristic curves in the abnormal state and the second field winding resistance versus current characteristic curve in the normal state.

Assignees

• Toshiba Energy Systems & Solutions Corp

Inventors

• Fujita Masafumi
• Kabata Yasuo
• Hirano Toshio
• Gunji Yuichiro
• Kobayashi Masashi
• Endo Hirotada
• Ando Koji

Classifications

• H02P9/006 Primary

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