Breaking short-circuit current and harmonic are two strict breaking conditions for circuit breakers. Current experimental methods difficult to test the ability of breakers under influence current, arc after high voltage components. Therefore, based on coupling simulation method magnetohydrodynamics circuits, this paper numerically models characteristics SF6circuit power frequency as well current. The opening SF6 is analyzed, conclusion drawn that may have an earlier zero crossing at higher...

ABSTRACT Power transformer windings are susceptible to deformation after multiple short‐circuit impulses, threatening power grid stability. Currently, there is a lack of experimental data on various characteristic parameters failures impulses. To investigate winding and its gradual deterioration, mock‐up was constructed study the cumulative effects. Short‐circuit tests were conducted under different current ratios, effect quantified based impedance axial force variations. A correlation...

Mechanical defects of GAS-insulated metal-enclosed switchgear (GIS) equipment seriously threaten power grid security, but <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> -site complex operating conditions create great challenges for defect diagnosis. Therefore, this article proposes a novel diagnosis and state assessment method GIS mechanical under varying currents. First, time-frequency analysis vibration signals based on neighboring...

Mechanical defect is an important reason for the failure of gas-insulated switchgear (GIS) equipment. Based on time-frequency characteristic vibration signal analysis five kinds mechanical defects, a novel intelligent algorithm model combining complementary ensemble empirical mode decomposition (CEEMD) and genetic improved kernel fuzzy mean clustering (GAKFCM) was proposed to identify type. First, platform detection system were built. Then CEEMD IMF sensitivity factors used analyse feature...

In order to reduce the sorting complexity of retired power batteries, life decay characteristics identification method battery module based on accelerated test is proposed in paper. Firstly, influence different parameters (environmental temperature, charge–discharge depth, rate, etc.) single analyzed according historical data batteries. The main affecting are determined. Secondly, correlation characteristic function between terminal voltage, state charge (SOC) and health (SOH) established....

With the proposal of global energy conservation and emission reduction policies, scale grid connection Integrated Energy System (IES) is gradually increasing. How to formulate a carbon trading mechanism guide system's emissions realize operation low-carbon economy has become main problem be solved urgently. Based on this background, paper proposes multi-stakeholders management control method IES considering scheme. First, dynamic multi-energy coupling flow model electricity, heat gas in...

In order to effectively make up for the defect of service life re-tired power battery echelon used in microgrids (MGs) and improve reliability MGs system, an energy management method based on hub electricity heat hydrogen multi-energy storage system (EHH-MESS) is proposed paper. Firstly, considering uncertain factors such as output, load fluctuation, retired defects multi flow impact, supply-demand balance model built. Secondly, taking economy supply goal, a control proposed, which considers...

To improve the efficiency of large-scale retired power battery (RPB) sorting in echelon utilization, and a stratified method is proposed paper which takes module (BM) as object. Firstly, correlation characteristic between single BM built, main parameters affecting attenuation are defined. According to consistency static initial module, first accomplished. Secondly, characteristics function established. The output calculated by using equilibrium control method. Finally, coupling relationship...

This paper studies the atmospheric corrosion characteristics of grid metal frame equipment in Chongqing. Through standard field test method -"exposure" method, this study carried out substation site hanging Q 235 steel power transmission and transformation engineering structural material environment, mastered data different stages. It was found that morphology, quantity products on surface varied greatly with progress corrosion. According to morphology time, combined image processing...

The mechanical defects of gas-insulated switchgear (GIS) equipments seriously threaten their safe and stable operation, but there are detection problems such as latency weak vibration response, especially for high-capacity GIS with large size. In this paper, a novel defect simulation method based on current excitation variable frequency is proposed to solve problem. First, 500 kV system loading capacity was designed by structural parameter adjustment, power matching harmonic suppression the...

Gas insulated switchgear (GIS) is widely used in power system because of its high reliability and compact structure. Mechanical defect one the main reasons for GIS equipment abnormal vibration, even insulation aging breakdown gas leakage. In order to detect identify internal mechanical fault GIS, this paper first developed a detection vibration signal based on piezoelectric acceleration sensor. After then, 110kV-3150A simulation test platform was built laboratory, two kinds defects such as...

Mechanical defects and partial discharge (PD) are two typical of GIS equipment. Both them can cause abnormal sound vibration, which may lead to misjudgment in field detection threaten the safe operation To explore difference between mechanical defect vibration PD GIS, this paper, based on actual operating test disconnector chamber, potential transformer chamber with normal status were carried out. The signals under cases normal, defects, obtained. Difference analysis from time domain,...

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