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With the requirements of circuit breaker's insulation and arc-interruption characteristics tests, a modular multi-function experimental platform is designed. The designed experimental platform takes the insulation and arc-interruption characteristics of the dielectrics in vacuum chamber and gas chamber as the experimental subjects; taking impulse generator, DC voltage source, current source, and frequency...
The paper investigates the pulsed AMF arc control on the vacuum arc and the post arc characteristic to reveal the mechanism of AMF arc control in different control time and find the proper AMF arc control. The pulsed AMF control system is designed and the pulse width is adjusting from 1.5ms to 10ms. The test circuit is set up in the synthetic test and the test VI is transparency in order to observe...
SF6 circuit breakers are widely used in power system because of its excellent arc interruption performance. But the liquefaction of SF6 gas at extreme cold area affect the reliability of the circuit breakers. To solve the problem, an intelligent temperature control system for the SF6 circuit breakers at cold area, the internal heating belt and their installation methods are designed in this paper...
This paper proposes the equivalent circuit of dynamic VD (PVD) in multi-break vacuum circuit breakers (VCBs). The equivalent circuit is composed of controlled post-arc sources, post arc resistors and equivalent capacitors. The PVD is divided into four processes: the initial transient recovery voltage (TRV) process, the oscillating TRV process, the stable TRV process and the power-frequency voltage...
In the coaxial spark switch conduction process, the spark discharge of trigger gap will have a certain degree of pre-ionization for overvoltage gap. In order to provide some reference for the design of coaxial switch, this paper has carried on a series of tests on the influence range and intensity of this pre-ionization. In this paper, trigger characteristics of the switch under different gas pressure...
For the requirements of low-jitter and long working-life triggered gas switches in actual conditions, the polycyclic type gas switch is designed, combining with the gas switch of three electrodes. Breakdown characteristics of trigger switches, the structure of their main electrodes and trigger electrodes are flat-polycyclic, flat-disk, and spherical-disk, are tested. The test results prove that, under...
The current interruption capacity of gas gap can be enhanced by series connecting with vacuum gap in hybrid circuit breaker. For the purpose of compensating the inferior interruption performance of CO2 gas gap, as the substitute for SF6 gas gap, the interruption principle and the dielectric strength recovery process of the series gaps of vacuum gap and CO2 gas gap are studied in this paper. Based...
CO2 gas is a possible substitute for SF6 gas in circuit breaker with relatively superior arc interruption performance. To enhance the interruption capacity of the circuit breaker which employs CO2 gas as its arc interruption dielectric, the interruption principle of the hybrid circuit breaker composed of vacuum interrupter and CO2 gas interrupter is studied. Based on the black-box arc models of hybrid...
By series connected with vacuum circuit breaker, the relatively limited arc-interruption capacity of the gas circuit breaker, which employs CO2 gas as the substitution to SF6 gas, can be compensated to match with or approach to the interruption capacity of SF6 gas circuit breaker. To investigate and optimize the voltage distribution between vacuum gap and CO2 gas gap, the three dimension models of...
This paper mainly focuses on the problem that high voltage circuit breaker's closing and opening operation at random phase brings harmful electromagnetic transient effects on the power system. To repress the negative transient effects, a 35kV SF6 phase-control circuit breaker equipped with electromagnetic force driving actuator is designed in this paper. Based on the constructed mathematical and structural...
Heart disease is widely believed to develop from two pathological processes. Circulating lipoproteins containing the nondegradable lipid, cholesterol, accumulate within the arterial wall and perhaps are oxidized to more toxic lipids. Both lipid accumulation and vascular reaction to the lipids lead to the gradual thickening of the vascular wall. A second major process that in some circumstances is...
The economic and financial crises of the early 21st century (e.g. 2007 -- 2009 global financial turmoil) have made financial instability, which is induced by financial contagion, as one of the major concerns in the economics or financial field worldwide. In this paper we model a network of financial cross-holdings based on the classic Leontief input -- output framework, and study the effect of diversification...
Financial contagion was often observed during the recent financial crisis, which indicates a critical need for a new and fundamental understanding of its dynamics. Drawing analogies with the extinction analysis -- a technique widely used in the study of ecosystems -- we focus on modeling and analyzing the financial contagion in a system where a large number of financial institutions are randomly connected...
In the paper, the prototype of vacuum circuit breaker with double-breaker was set up. In order to find the matching characteristics of VCB with double-break by means of breaking test, the matching characteristics test includes different vacuum gaps, different type electrodes and different grading capacitors. The optimal combination of AMF and TMF type electrodes was gained by comparing with the breaking...
The paper established the simulation model of series vacuum arc of Vacuum Circuit Breaker (VCB) with double-break using Magneto Hydro Dynamic (MHD) model. To gain the matching characteristics of series vacuum arc, the influence of series different vacuum gaps and interactional magnetic field was analyzed. The distribution of micro-characteristics was depended on the axial magnetic field causing by...
Interest in the application of vacuum circuit breaker (VCB) with multiple breaks arises from technical and economic considerations. Based on analysis on previous work, a 126kV VCB with triple breaks based on fiber-controlled vacuum interrupter modules (FCVIMs) in series is presented in this contribution. A FCVIM is composed of its own outer insulation, vacuum interrupter, permanent magnetic actuator...
For the purpose of repetitive pulsed power applications, specially designed TVSs were tested under different high frequency currents in this contribution. Two TVSs named TVS-1 and TVS-2 respectively were designed to investigate the high frequency current breaking characteristics with or without an axial magnetic field (AMF) aid. The TVS with AMF at the cup-like anode can generate a magnetic field...
For the purpose of repetitive pulsed power applications, specially designed TVSs were tested under different high frequency currents in this contribution. Two TVSs named TVS-1 and TVS-2 respectively were designed to investigate the high frequency current breaking characteristics with or without an axial magnetic field (AMF) aid. The TVS with AMF at the cup-like anode can generate a magnetic field...
With the accelerated construction pace of the international traveling island, Hainan province will have another golden period of development and opportunity for its socio-economic since the establishment of Hainan. However, the protection of environmental resources is an important guarantee for building a sustainable development international traveling island. Currently, there are a variety of potential...
Hybrid circuit breaker is comprised of SF6 interrupter and vacuum interrupter connected in series. The novel hybrid circuit breaker takes advantage of the best capabilities and properties of these two interrupters. Vacuum interrupter has excellent ability to deal with the steep rising of TRV, whereas the SF6 interrupter is good at withstanding the peak value of TRV. Their cooperation has positive...
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