Electromagnetic interference resistance testing method for current transformer
A technology of anti-electromagnetic interference and current transformer, applied in the field of electronics, can solve problems such as failure to determine the eccentric distance
Inactive Publication Date: 2011-06-29
TSINGHUA UNIV +1
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Problems solved by technology
However, the theoretical model and quantitative formula for determining the eccentric distance have not been given in the prior art, and the same large current source as the primary bus current is still required
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[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0018] Refer below Figure 4 and Figure 5 A test method for anti-electromagnetic interference for a current transformer according to an embodiment of the present invention is described.
[0019] Such as Figure 4 As shown, at the center of the iron core of the current transformer (TA) there is an original primary busbar, which can generate the main magnetic field. An eccentric bus bar is vertically arranged at a preset distance L from the center of the iron core, wherein the eccentric bus bar can generate a magnetic field when energi...
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The invention discloses an electromagnetic interference resistance testing method for a current transformer, comprising the following steps: an eccentric bus is arranged at a preset distance position from the center of an iron core of a current transformer, and the eccentric bus is energized, wherein the magnetic field generated by the eccentric bus in the current transformer is offset with a synthesized residual magnetic field, and the synthesized residual magnetic field is the residual field after a stray field generated by the external energizing conductor and a main magnetic field generated by an original primary energizing bus at the center of the current transformer are synthesized. According to the electromagnetic interference resistance testing method disclosed by the embodiment of the invention, by the preset eccentric distance from the eccentric bus to the center of the iron core, a test current which is less than the current of the original primary energizing bus is adopted, so as to test the influence of an external energized conductor on the current transformer equivalently.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to an anti-electromagnetic interference test method for ionization transformers. Background technique [0002] With the continuous growth of electricity demand, the installed capacity of generator sets is getting larger and larger. However, due to factors such as insulation technology, the rated voltage of the generator outlet has not been increased much, which has led to a sharp increase in its rated current. For example, the rated current of a 600MW generator set has reached 25kA-28kA. Such as figure 1 As shown, the magnetic field generated by the external current-carrying conductors such as the adjacent phase high-current bus bars seriously affects the normal operation of the measuring and protection instruments (such as high-current transformers, etc.) installed here. [0003] The current transformer (TA) is based on the principle of electromagnetic induction and consists ...
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IPC IPC(8): G01R31/00
Inventor 屈凯峰赵伟江波黄松岭吴静蒋卫杨华云杨鹏张皓
Owner TSINGHUA UNIV