A performance test device for hybrid DC solid-state circuit breakers

Abstract

The invention relates to a performance test device of a mixed-type direct-current solid-state breaker, and belongs to the field of high voltage and large current experiments. The performance test device comprises a rectifier, a charging capacitor set, a high-speed camera, a displacement sensor, an oscilloscope, a high-voltage differential probe, a current divider and the like. By means of changes of the number of capacitors in series-parallel connection, a capacitance value of the capacitor set is changed. The high-speed camera is connected with a computer and is used for shooting the motion process of a quick mechanical switch contact and a pull rod in the switching-off and switching-on processes. The displacement sensor is used for measuring the motion speed of a quick mechanical switch pull rod and a contact. The current divider is used for measuring currents flowing through a discharging circuit, a power electronic branch circuit, a buffer and a voltage limiter. The high-voltage differential probe is used for testing the serial-connection voltage sharing effect of each power electronic component. The oscilloscope is used for displaying a test result. The performance test device meets requirements for different parameters in the development process of the mixed-type direct-current solid-state breaker and provides a quantization basis for work performance analysis.

Description

technical field

[0001] The invention relates to a performance testing device for a hybrid DC solid-state circuit breaker, belonging to the technical field of high-voltage and high-current experiments. Background technique

[0002] Because there is no current zero-crossing point in the DC system, it is difficult to extinguish the arc. With the development of power electronics technology, hybrid DC solid-state circuit breakers based on high-power power electronic devices have become an important technical solution for quickly breaking DC current. The hybrid DC solid-state circuit breaker is composed of power electronic devices and mechanical switches connected in parallel. During normal operation, the power electronic devices are disconnected and the mechanical switches carry the load current. When the system fails, the mechanical switch is disconnected, and the fault current is transferred to the power electronic branch after a period of time under the action of the arc volt...

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