Transformer internal fault detector专利检索-浪涌电流电流电路专利检索查询-专利查询网

Transformer internal fault detector

阅读：727发布：2023-11-20

专利汇可以提供Transformer internal fault detector专利检索，专利查询，专利分析的服务。并且A fault detector for power transformers which quickly indicates an internal fault condition. In one embodiment, the current in the primary and secondary windings are compared by a differential relay which may be restrained by a voltage developed during magnetizing inrush current conditions. This voltage is provided by a pick-up coil which is located between the primary winding and the magnetic core leg. The coil is oriented so that the voltage induced therein is relatively large when the core leg is saturated by an inrush current. In another embodiment, a first voltage from a similarly positioned pick-up coil is integrated and applied to a differential relay. A second voltage which is proportional to the difference between the magnetomotive forces in the primary and secondary windings is also applied to the differential relay. The differential relay compares the integrated voltage and the second voltage and is activated when an internal fault changes the normal ratio of these two voltages.，下面是Transformer internal fault detector专利的具体信息内容。

权利要求

1. An internal fault detector for transformers having primary and secondary windings disposed around a leg of a magnetic core, comprising: means for measuring the current in the primary winding; means for measuring the current in the secondary winding; differential means responsive to predetermined ratios of the measured currents in the primary and secondary windings; and a pick-up coil positioned between the primary winding and the magnetic core leg, said pick-up coil developing a predetermined voltage thereon when the magnetic core becomes saturated, with the predetermined voltage being used to prevent activation of the differential means.

2. The internal fault detector of claim 1 wherein the pick-up coil is aligned with its longitudinal axis parallel to the longitudinal axis of the primary winding.

3. The internal fault detector of claim 1 wherein the pick-up coil has an electrostatic shield disposed therearound.

4. The internal fault detector of claim 1 wherein the pick-up coil is wound around a non-magnetic rod.

5. The internal fault detector of claim 1 wherein the pick-up coil is wound around a magnetic rod.

6. An internal fault detector for transformers having primary and secondary windings disposed around a leg of a magnetic core, comprising: a first current transformer which provides a first voltage proportional to the current in the primary winding; a second current transformer which provides a second voltage proportional to the current in the secondary winding; a differential relay responsive to predetermined ratios of the first and second voltages, said relay including inhibiting means which restrains activation of the differential relay when a restraining voltage applied to the inhibiting means exceeds a first predetermined value; and a pick-up coil connected to apply the restraining voltage to the inhibiting means and positioned between the primary winding and the magnetic core leg with the axis of said pick-up coil being parallel to the axis of the primary winding; said pick-up coil providing a restraining voltage to the inhibiting means which exceeds a first predetermined value when the magnetic field between the primary winding and the leg of the magnetic core exceeds a second predetermined value, saId second predetermined value being substantially greater than the value of the magnetic field produced between the primary winding and the leg of the magnetic core when magnetizing inrush current is not flowing in the primary winding.

7. An internal fault detector for transformers having primary and secondary windings disposed around a leg of a magnetic core, comprising: means for comparing the magnetomotive forces in the primary and secondary windings and providing a first voltage responsive to the comparison; means for providing a second voltage responsive to the magnetic field between the primary winding and the core leg produced upon saturation of the core leg; means for integrating the second voltage and porivding a third voltage proportional to the integral of the second voltage; and differential means responsive to predetermined ratios of the first and third voltages.

8. The internal fault detector of claim 7 wherein the means for comparing the magnetomotive forces includes: means for measuring the current in the primary winding; means for measuring the current in the secondray winding; and means for comparing the ratio of the currents in the primary and secondary windings.

9. The internal fault detector of claim 7 wherein the means for providing the second voltage includes a pick-up coil positioned between the primary winding and the magnetic core leg with the axis of said pick-up coil being substantially parallel to the axis of said primary winding.

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Transformer internal fault detector

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