Searching for SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> -substitute gaseous dielectrics is currently an urgent task high-voltage circuit breaker (HVCB) insulation and arc extinction applications. Once leaked, will affect the Earth's climate on order of decades to millennia. In this work, we developed a test method that supplies series extended pulse voltages obtain dynamic dielectric strength C...

GIL/GIS bus is widely used in the field of power transmission and distribution, demand for lightweight becoming more prominent. To reduce weight ensure safety reliability structure, a new 6 σ robust design method based on electric‐thermal‐mechanical co‐simulation proposed. Taking 550 kV/5000A as initial considering uncertainty product size performance, model insulation electric strength, current temperature rise, mechanical stress multi‐performance established. The finite element numerical...

This study has designed a set of motor operating devices for 126 kV vacuum circuit breaker (VCB) to improve its reliability and controllability. A finite‐angle permanent magnet brushless (FAPMBM) with multi‐slot stator structure dovetail rotor been based on the torque speed requirements motor. These were determined by dynamic analysis device short‐time, working characteristics. The work performance prototype evaluated in an online experiment VCB, this, segmented control method designed....

For diagnosing deformation fault and latent loosing status of winding, this study proposed a state diagnosis method transformer winding based on fusing vibration reactance parameters. The wavelet energy – matrix norm transformation identification were to extract multi‐information collection system was designed. Aiming at the S‐11‐M‐500/35 transformer, short circuit current impact experiment made three windings Status database for normal, loosing, specific types established. State normal...

With the increasing of short-circuit current power grid, by use series reactor to limit 500 kV is feasible, but introduction could change transient recovery voltage and have effect on circuit breakers interrupting performance. In this paper, used Dongqing substation, changes different values under three-phase fault are analyzed, best-value work interval obtained; at same time, problem TRV solved mean parallel capacitance, it can reduce amplitude rate TRV. The results showed that: way using...

In the computational process of very fast transient over-voltage (VFTO), it is essential to find an accurate model for a gas insulated substation. The arcing disconnector particularly important. general not able give good description arc development process. this paper, based on physical and existing models (the exponential time-varying resistance segmental models), dynamic proposed, which divided into two stages before after zero crossing. combines hyperbola Mayr describe arcing. present...

Environmental-friendly insulating medium C <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> F xmlns:xlink="http://www.w3.org/1999/xlink">10</sub> O has attracted wide attention due to its good insulation properties, but there are still few researches on the discharge decomposition of O. Based density functional theory, characteristics simulated in this paper. Firstly, possible paths analyzed and energy required for different is...

The dynamic characteristics of wind turbine generator tower are studied using the aerodynamics and structural dynamics theories, mathematical model structure established. numerical simulation method is used to simulate turbulence flow wind, customed in ANSYS. 32 bands frequency vibration mode analyzed load-time, speed-time curves other data can be obtained. results coincident with regulation provide reference for actual project.

Based on a hydro-energy storage station, the very fast transient over-voltage in GIS is calculated and simulated using FORTRAN language Matlab program. The node with maximum of VFTO found. suppression effect cable SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> busbar discussed, influence shunted capacitor analyzed paper. It indicated that peak-values may be restricted by increasing length properly, frequency lowered. In addition,...

The transitional process from EHV to UHV not only brings many technical problems, such as zero drift, resonance overvoltage, quenching of secondary arc current, but also makes the problem VFTO in GIS caused by operating disconnector increasingly outstanding. With development China, there still exist works be done thoroughly for further study characteristics. In this paper, a mathematical model has been set up respectively based on 500 kV and an 800 amplitude-frequency its effects power...

One of the important operational conditions a single-circuit transmission line is reclosing circuit breaker, which depends on value secondary arc current. This paper presents major methods suppressing current in ultra-high-voltage power system. When high speed earthing switch adopted, effect studied. The magnitude and recovery voltage path are obviously reduced after installing line, turn reduces extinction time assures successful single-phase auto reclosure. affects an investigated basis models.

A novel permanent magnet motor actuator on high voltage circuit breaker is proposed. Based the characteristics requirement of breaker, a limited angle brushless DC servo designed. By using finite element method, basic and dynamic simulation starting are carried out, which results (such as electromagnetic torque, current, speed location parameters) have been analyzed. The analysis indicated that rotary can provide mechanism so it supply basis for vacuum actuator.

The peak load regulation ability of thermal power unit is closely related to the deep mode and strategy system. Meanwhile, peak-load affected by many factors. In order meet increasing demand for regulation, it necessary study economy units under condition large-scale wind grid connection from perspective enterprises, enterprises society. this paper, taking full account current capacity coal consumption cost control units, considering stage a combination optimization model with joint...

The prototype of limited angle permanent magnet motor and the performance testing are researched based on mechanical property requirements 40.5kV vacuum circuit breaker. system is accomplished according to Sensors with high precision selected, method designed. characteristics (such as angle, armature current) stroke curve moving contact obtained by using system. results indicated that operating mechanism can provide a average speed fast response time, which matched requirement breaker offer...

The insulation characteristic of high voltage circuit breaker in cold regions is the basis for design breaker. In this paper, several gas physical and insulated properties can be used region are compares, CF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> was fed to use obtained. Breakdown experiment under typical electrodes investigated, performance short gap necessary basic data mixed interruption research provided.