A shielding device for high voltage DC circuit breaker
A technology for DC circuit breakers and shielding devices, applied in high-voltage air circuit breakers, high-voltage/high-current switches, circuits, etc., can solve the problems of inability to transplant DC circuit breakers and large structural dimensions, and achieve improved electric field distribution and compact overall structure , Inhibit the effect of partial discharge suppression
Active Publication Date: 2020-01-17
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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Problems solved by technology
The shielding system design of traditional converter valve products is mainly composed of a large shell-type shielding cover and a small-sized shielding plate. The structural size is too large to be transplanted and applied to DC circuit breakers.
Method used
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Embodiment Construction
[0034] Below in conjunction with accompanying drawing, the present invention will be further described:
[0035] Such as figure 1 As shown, a shielding device applied to a high-voltage DC circuit breaker provided by the present invention is divided into two structural types in terms of electrical and structural design: a small-sized corner shield 2 corresponding to the internal components of the valve layer of the DC circuit breaker and A straight shield 3, a tubular shield 1 and a U-shaped equalizing tube 4 corresponding to the overall structure of the DC circuit breaker. These shielding structures have different structures due to differences in electrical functions.
[0036] Such as figure 2 As shown, the overall structure of the corner shield 2 corresponding to the valve layer assembly of the DC circuit breaker, the corner shield 2 is composed of the corner shield body 21 , supporting corner pieces 22 , and cross-arm insulators 23 . The corner shield body 21 is composed...
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The invention provides a shielding device for a high-voltage direct-current circuit breaker. The shielding device comprises U-shaped equalizer tubes (4), angle shielding cases (2), straight panel shielding cases (3) and tubular shielding cases (1). The four U-shaped equalizer tubes (4) are arranged at the bottom of a direct-current circuit breaker and are used for bearing lowest voltages of the direct-current circuit breaker; and each two of the U-shaped equalizer tubes are arranged at one side and the U-shaped equalizer tubes are distributed at the two sides symmetrically. The angle shielding cases (2) and the straight panel shielding cases (3) are distributed at an intermediate valve layer of the direct-current circuit breaker and correspond to all valve modules and switch assemblies of valve layers of the direct-current circuit breaker. The two angle shielding cases (2) and one straight panel shielding case (3) form a shielding unit of a valve layer assembly; and two shielding units are arranged at each valve layer symmetrically. Besides, the two tubular shielding cases (1) are distributed at the top of the direct-current circuit breaker and are used for bearing highest voltages of the direct-current circuit breaker; and the two tubular shielding cases (1) are arranged at the same layer symmetrically.
Description
Technical field: [0001] The invention relates to a high-voltage direct current circuit breaker in direct current transmission, in particular to a shielding device for a high-voltage direct current circuit breaker. Background technique: [0002] The design of the shielding system is closely related to the structural layout and voltage level of the DC circuit breaker. [0003] The structure of the DC circuit breaker is complex, and there are relatively sharp metal corners in electrical devices, metal structural parts, terminals, etc. Under a certain potential, these sharp corners will cause corona discharge and local discharge. In order to effectively suppress internal partial discharge and external corona discharge when the DC circuit breaker is operating at high potential, a shielding system needs to be designed to improve the electric field distribution characteristics inside the DC circuit breaker and to the ground, and effectively suppress the occurrence of discharge. F...
Claims
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IPC IPC(8): H01H33/24
CPCH01H33/24
Inventor 贺之渊魏晓光张升王成昊刘远周万迪
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD