Abstract This letter delves into the influence of drain wire design on electromagnetic radiated emission (RE) from a commercial universal serial bus (USB) cable operating in high‐speed data transfer mode. The investigation involves an experimental comparison measured RE across various retrofitted cables. Notably, it is demonstrated that distribution contact points drain‐shield has negligible effects RE. Conversely, relocating externally to shields and minimizing distance with respect...

In this letter, a nanosecond-level transient electric field (E-field) sensor based on monopole electrically small rod antenna is proposed. The working principle and design process of the are analyzed in detail while finite-element simulation carried out to verify response characteristics both time frequency domains, whose upper cut-off can reach 680 MHz. For purpose assessing actual detection capability HVDC converter stations, designed letter was used detect radiation E-field valve hall...

The excessive radiation emission (RE) from universal series bus (USB) cable has raised great concerns with the fast increase of data transmission speed. In this paper, a simulation model combining both full-wave and line solver been developed to predict RE typical USB 2.0 system in data-transmission mode. enables investigations on impact different parameters its RE, conclusion offers guidelines for design terms reduction source.

This paper investigates how the accuracy of fault location is affected by terminal reflection uncertainty and proposes a full-transient method based on particle swarm optimization (PSO) algorithm to solve bias. The LCC-HVDC system taken as research object, maximum relative error reach 9.3% 17.96% for hundreds kilometers line due coefficient converter station. PSO proposed optimize phase shift power transmission boundary coefficient, make simulation natural frequency being closest real which...

Abstract-This paper introduces a novel fault location method utilizing polynomial-chaos expansion (PCE) designed specifically for non-uniform transmission lines affected by uncertain parameters.It considers the parameters arising from height and ground conductivity in lines, examining their impact on conventional methods, such as natural frequency full-transient analysis approach.These uncertainties lead to considerable errors, particularly magnified with increasing distances.To address...

This paper proposes a miniaturization, wideband and nanosecond-level risetime transient electric field (E-field) sensor based on monopole electrically small rod antenna. The upper cut-off frequency of the can reach 680 MHz. For purpose assessing actual detection capability in HVDC converter stations, designed this was used to measure valve hall artificial short-circuit tests. measurement results E-field indicates that is able respond instantaneously generated by action key power electronic...

The conventional current or voltage signal-based condition monitoring systems for DC high-voltage equipment have the disadvantages of huge volume, inconvenient operation, and low measurement bandwidth sampling rate. To overcome these drawbacks, a simplified calculational model radiative near-field electric field in circuit breaker valve hall is proposed. This based on analytical finite-length current-carrying linear ideal conductor reveals physical mechanism non-invasive situational...

In the case of short-circuit fault, DC converter station VSC-HVDC would produce transient electromagnetic field, which interfere and impact on secondary equipment in station. This paper analyzes field short circuit tests system a The time frequency characteristics electric signals valve hall have been discussed. For measurement probe near hybrid breaker, highest amplitude measured between two breakers is 5.1 kV/m while most components are below 1 MHz. These signal has potential application...

This paper investigates the impact of power converter station modeling to high frequency overvoltage based on on-site experimental test a fully operational 200 kV MMC-HVDC station. Artificial short-circuit faults were generated in system with hybrid DC circuit breakers along coaxial cables by means an unmanned aerial vehicle for first time. Fault transients recorded during tests are found not comply typical framework where stations assumed present impedance, or at least dominated reactor...

Abstract In this paper, a realization method for high-efficiency broadband power amplifier (PA) based on split-ring resonator (SRR) second harmonic output matching network (SHOMN) is presented. The SRR composed of double rectangular rings, and it can flexibly match the components to impedance region in Smith chart wide frequency band. Besides, transformation characteristic derived, optimal converted from transistor drain SHOMN accurate fundamental matching. For validation, PA operating...

With the development of medium voltage DC (MVDC) distribution network, research MVDC circuit breaker has also been paid more attention. In this paper, a simulation model is established to analyze influence stray inductance on oscillation based ETMF, and influences main branch commutated time, zero-crossing speed maximum current are obtained. An experiment was built verify validity simulation. The provides reference for parameter selection oscillating DCCB with arc as excitation source.

At present, the electric power industry is developing rapidly. The installed capacity of each plant expanding, and short circuit current also growing traditional limiter not only difficult to break large current. Before breaking off may have caused damage equipment, causing huge economic losses. in order meet demand market our country, research development a new practical which can limit high fault imperative. Besides will bring benefits plants substations industry, it be used supply sets...

Abstract In this letter, a novel design method of split‐ring resonator (SRR) as the input matching network (IMN) power amplifier (PA) is proposed. Compared with conventional microstrip lines, SRR capable providing necessary harmonic short‐circuit while achieving broadband impedance matching. Applying even–odd‐mode theory, transformation characteristics are analyzed and show can perform accurate To verify proposed method, PA designed implemented, 10‐W GaN transistor well matched to source by...

This paper proposes an optimized simulation model and parameter selection method for direct current circuit breaker (DCCB) with passive oscillation. Firstly, the breaking process arc characteristics of DCCB are briefly described, models established optimized. Then influence commutation branch parameters on interruption is analyzed by obtained model, appropriate selected. Finally, experimental built to verify correctness simulation.