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Q&A：how to test transformer differential slop with 3 phase relay test kit

Testing of transformer differential characteristics can be challenging. Three‐phase testing, while straight forward from a magnitude and phase relationship point of view, requires 6 high‐amperage test currents.For delta ‐ grd wye winding transformers, traditional single‐phase testing requires non‐obvious multipliers and does not simulate real‐world fault conditions. This paper discusses an alternate method of single‐phase testing that simulates real‐world single‐phase loading conditions without the need for phase shifts or current multipliers. This alternate method verifies the differential relay settings are appropriate for the installed transformer by using the installation drawings and transformer nameplate diagram to determine the test connections. Application examples of installations at Minnesota Power substations are used to demonstrate the method. more detail please go link to: https://www.relay-test.com/view/549.html

Q&A：What is the multiple of the rated symmetrical short-circuit current in the TPY current transformer

The multiple of the rated symmetrical short-circuit current is for the transient protection CT The ratio of rated primary short-circuit current to rated primary current, Kssc Rated primary short-circuit current, symmetrical root-mean-square value of primary short-circuit current Can refer to standard DL/T725

Q&A：What is the accurate limit coefficient of current transformer

The accurate limit coefficient is for the protection level current transformer, generally 5, 10, 15, 20, 30. It refers to the primary current multiple when the composite error does not exceed the specified value. This multiple is called the accuracy limit coefficient.

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