2/3匝线圈式纵磁触头大开距真空断路器分闸速度设计

doi:10.19595/j.cnki.1000-6753.tces.230608

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Abstract

The development of vacuum circuit breakers (VCBs) towards transmission voltage is an effective alternative of SF₆ CBs on background of carbon dioxide emission and carbon neutrality nowadays. In the VCBs, the axial magnetic field (AMF) contacts have been widely mounted tends to promote the breaking capability of circuit breakers. The vacuum arc plasma can be constrained by the axial magnetic field lines to counteract the pinch force of conducting current, which always concentrate the arc plasma at local anode surface to generate an anode spot in high current interruption process. In this case, a rational design of opening velocities for the VCBs with coil-type AMF contacts could effectively regulate the flux density of the axial magnetic field imposed on the electrode space. However, there is still a lack of quantitative design method for a full stroke opening velocities of the VCB with coil-type AMF contacts.
This paper experimentally investigates the influence of arcing current and opening velocities on evolution of vacuum arc anode discharging modes. Couples of coil-type AMF contacts, tending to be applied in a 126 kV single-break vacuum circuit breaker, were mounted in a demountable vacuum chamber to investigate the influence of opening velocities on transitions of vacuum arc anode discharging mode. A high charge coupled device (CCD) was used to photograph these transitions. Two kinds of opening velocities, v₁ and v₂, were used to define an opening travel-curve: v₁ is an initial opening velocity, which defines as an average velocity over 1/3 contact stroke, d, of 60 mm; while, v₂ is an average velocity over 2d/3. In the experiment, v₁ varied from 1.8 m/s to 2.4 m/s and 2.7 m/s, respectively. Correspondingly, v₂ varied from 2.4 m/s to 2.7 m/s and 3.0 m/s. The arcing current was set to rise from 4 kA to 40 kA, stepped by 4 kA. Test result shows that v₁ has significant impact on the transition of intense arc mode into diffuse arc mode in the first arcing current loop, while v₂ significantly influences the formation of both footpoint mode and anode spot mode in the rest arcing current loop.
The design of v₁ should higher than the threshold velocity, v_{1_th} of 3.5 m/s, which corresponds to a peak critical contact gap d_{I_th} for the transitions of intense arc mode into diffuse arc mode. While, v₂ should not exceed the threshold velocity, v_{2_th} of 3.0 m/s, which corresponds to a maximum critical contact gap for the formation of footpoint mode and anode spot mode. In this case, the high current vacuum arc could quickly transit from the intense arc mode into diffuse arc mode in short arcing time high current interruption. Meanwhile, the formation of anode spot could be effectively avoided in long arcing time high current interruption. In addition, the transition of anode discharging mode for the test AMF contact could be predicted by comparing the actual axial magnetic flux density, B_axial, with the critical quantities, B_{cri_intense}and B_{cri_anode}. These critical axial magnetic flux densities were experimentally determined for the transitions of intense arc mode to diffuse arc mode, and diffuse arc mode to footpoint mode and anode spot mode, respectively. The above v₁ and v₂ were applied on a 126 kV single-break VCB, and proved to be effectiveness by passing series of short-circuit current breaking type test. The result could provide reference and foundation for VCBs developing towards transmission voltage level.

Key words： Axial magnetic field large-gap vacuum circuit breakers anode discharge mode opening velocity

Received: 04 May 2023

PACS:

TM561.2

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	Ma Feiyue
	Yao Xiaofei
	Liu Zhiyuan
	Sun Shangpeng
	Bai Tao

Cite this article:

Ma Feiyue,Yao Xiaofei,Liu Zhiyuan等. Design of Opening Velocities for Large-Gap Vacuum Circuit Breakers with 2/3 Coil-Type Axial Magnetic Field Contacts[J]. Transactions of China Electrotechnical Society, 0, (): 239626-239626.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.230608 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/239626

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