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“Demagnitize” Tab

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To eliminate the residual flux of a transformer, the demagnetize test is used.

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For example, after executing a DC resistance test, it is generated in the transformer.

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This test is done in such a way that a direct current is injected in steps and decrements in direct and reverse directions to each phase of the transformer separately.

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The amount of injection current is entered in “I Test” field.

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In “Test Method”, the test method is determined as single-phase or three-phase.

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By changing this section, the wiring changes to the right of the page.

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It’s specified in “Side” field to perform the test on the transformer.

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By changing this section, the wiring changes to the right of the page.

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In “Phase”, each of the phases A, B and C can be specified for testing.

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By changing this section, the wiring changes as shown on the right of the page.

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In “State Time”, the time of each state to change the current is specified.

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After configuring the wiring in accordance with the picture,

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to execute the test, first press “Init Test” button, then run the test.

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In “Signal View”,

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the injected current and the actual current value are displayed; this current value turns zero as soon as the demagnetization is completed.