Secondary open circuit protection device for current mutual inductor

Abstract

The invention relates to a secondary open circuit protection device for a current mutual inductor. The secondary open circuit protection device is characterized in that a central processing module (1) is respectively connected with an input interface module (3) and an output interface module (4) through a digital-to-analog conversion module (2), the input interface module (3) is respectively linked with a voltage control module (5), a power module (6) and a reset control module (7), the voltage control module (5) is connected with a secondary open circuit voltage (9) of the current mutual inductor through a signal collection module (8), and the output interface module (4) is respectively connected with a sound alarm module (10) and an image display module (11). The secondary open circuit protection device has the advantages that by the adoption of a digital processing circuit, detection is accurate, the protective action is rapid, the overvoltage generated during a secondary open circuit of the current mutual inductor is effectively limited, the protective performance does not change along with changes of running modes of a power grid, potential safety hazards are eliminated, and accidents are avoided.

Description

technical field [0001] The invention relates to the field of current transformers, in particular to a secondary open circuit protection device for current transformers. Background technique [0002] Existing current transformers (CTs) are widely used in power systems. During normal operation, the secondary overvoltage of the current transformer is in a short-circuit state, and the output voltage is very low. In actual operation, if the secondary winding is open or the primary winding flows abnormal current (such as lightning current, resonant overcurrent, capacitor charging current, inductive starting current, etc.), thousands of An overvoltage of 10,000 volts or even tens of thousands of volts will not only cause the current transformer to be overexcited and burn out, but even endanger the safety of the staff. Therefore, a special protection device is urgently needed to protect the current transformer. Contents of the invention [0003] The object of the present inventi...

AI Technical Summary

Problems solved by technology

In actual operation, if the secondary winding is open or the primary winding flows abnormal current (such as lightning current, resonant overcurrent, capacitor charging current, inductive starting current, etc.), thousands of Volts or even tens of thousands of volts of overvoltage will not only cause the current transformer to be overexcited and burn out, but even endanger the safety of the staff. Therefore, a special protection device is urgently needed to protect the current transformer.

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