The method of judging the complete stop of transformer air cooling by using analog quantity plus switch quantity
A transformer and switching value technology, which is applied in the direction of transformer/inductor cooling, transformer/inductor parts, and measurement of electrical variables. It can solve the problems of auxiliary contacts being easily closed by vibration, poor contact of contactors, and full-stop protection of transformer air cooling. Misoperation and other issues
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[0019] Taking the air-cooled full-stop protection of transformers in a substation as an example, the attached figure 1 As shown, the air-cooled full stop of the conventional transformer is judged by contactor K1, contactor K2, and normally closed contacts of the contactor in the figure, that is, when the two-way air-cooled power supply is lost, the contactor K1, contactor K2, and contactor Since the excitation will be lost without power supply, the normally closed contact is closed, and the transformer air-cooled full stop protection operates.
[0020] This method mainly has the following problems: 1. It is judged that the contactors used are all installed in the outdoor terminal box, and the working environment is harsh, which may easily cause poor contact of the contactors, and easily cause the transformer to stop the air-cooled full stop protection and cause damage to the transformer. 2. The contactor is installed near the transformer. Due to the large vibration during oper...
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