Current converting switch device applicable to flexible direct current transmission direct current circuit breaker

Abstract

The invention discloses a current converting switch device applicable to a flexible direct current transmission direct current circuit breaker. A first main electrode and a second main electrode are located in a sealed cavity; the first main electrode is located above the second main electrode, and a gap is reserved between the first main electrode and the second main electrode; a groove is formedin the bottom of the second main electrode; the groove is filled with a macromolecular polymer ablation material; a discharge cavity is formed in a combination surface of the macromolecular polymer ablation material and the bottom of the groove; a hole is formed in the top of the discharge cavity; one end of a trigger electrode is connected with a trigger circuit, and the other end of the triggerelectrode penetrates through the macromolecular polymer ablation material and is inserted into the discharge cavity. The switch device is long in service life, simple in structure, relatively high intrigger conductivity, relatively low in trigger conduction delay and low in working coefficient.

Description

technical field [0001] The invention relates to a converter switch device, in particular to a converter switch device suitable for a flexible DC transmission DC circuit breaker. Background technique [0002] At present, the focus and development trend of DC circuit breakers) The multi-terminal DC transmission system puts forward higher requirements on the function of DC circuit breakers. For a multi-terminal HVDC grid, the DC circuit breaker must quickly cut off the faulty line within a few milliseconds to prevent a single point failure from spreading to other grid equipment (such as a converter, etc.) and causing a wide range of faults. Since the damping of the DC grid is much lower than that of the AC grid, the DC circuit breaker needs to withstand a high rate of fault current rise. At the same time, in order to maintain the DC bus voltage, protect the important equipment of the DC system, and avoid the lock-up of the converter, the fault current needs to be limited. The ...

AI Technical Summary

Problems solved by technology

It can be seen that the existing patents mostly focus on the topology of DC switching circuits based on artificial zero-crossing, and the specific implementation structure of the core component of the auxiliary zero-crossing oscillation circuit-the commutation switch is not elaborated.

[0006] The article "Discharge Characteristics of Atmospheric Pressure Plasma Jet Injection Device Based on Capillary Discharge" introduces an atmospheric pressure plasma jet injection device based on capillary discharge, which can be used to trigger the conduction of gas switches with long gap distances, using single discharge ablation, but standby In this state, there is a pre-charged DC voltage on the trigger electrode, the amplitude of the discharge current is as high as 8kA, and the life span is about 300 times. The surface of the material is severely ablated, which affects the life of the switch.

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