File:Protective relay - ferraris disk.png
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Protective_relay_-_ferraris_disk.png (247 × 300 pixels, file size: 28 KB, MIME type: image/png)
Summary
| Description |
English: Protective relay checking the balancing of three phases based on the Ferraris disk |
| Date | |
| Source | https://www.google.com/books/edition/Journal_of_the_Institution_of_Electrical/zINNAAAAYAAJ?hl=en&gbpv=1&pg=PA526 |
| Author | A. E. McColl |
Licensing
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1931.
 Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:15, 17 June 2025 | | 247 × 300 (28 KB) | wikimediacommons>Викидим | Uploaded a work by A. E. McColl from https://www.google.com/books/edition/Journal_of_the_Institution_of_Electrical/zINNAAAAYAAJ?hl=en&gbpv=1&pg=PA526 with UploadWizard |
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