Aspects Regarding the Electromagnetic Pattern for the Operating Mechanism of a Medium Voltage Circuit Breaker

2019 ◽  
Author(s):  
Marian-Bogdan Micu ◽  
Maricel Adam ◽  
Mihai Andrusca ◽  
Cosmin Deac
Keyword(s):  
Circuit Breaker ◽  
Operating Mechanism ◽  
Medium Voltage ◽  
The Operating Mechanism

scholarly journals A Study on the Dynamic Responses and Joints Clearance Optimization of the Planar Operating Mechanism of High-Voltage Circuit Breaker

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Xiaofeng Li ◽  
Shijing Wu ◽  
Xiaoyong Li ◽  
Deng Zhao ◽  
Qiaoquan Li
Keyword(s):  
Mechanical System ◽  
High Voltage ◽  
Reaction Force ◽  
Circuit Breaker ◽  
Dynamic Responses ◽  
Operating Mechanism ◽  
Negative Effects ◽  
Flexible Links ◽  
High Voltage Circuit Breaker ◽  
The Operating Mechanism

The operating mechanism is responsible for a large part of machinery faults of high-voltage circuit breaker, which plays a crucial role in the reliability of the power grid. It consists of multiple flexible links connected by revolute joints with inevitable clearances between adjacent links. Flexible links and joints clearance have negative effects on the performance of the whole mechanical system. In this study, the dynamic simulation model of the multiple links articulated operating mechanism is built, and its validity is testified by operation experiment. Then, numerical simulation investigations are implemented to analyze the effects of flexible links and joints clearance on the dynamic responses of the operating mechanism. The results demonstrate that both flexible links and joints clearance exert associated negative effects on the mechanism performance. Furthermore, aimed at improving the dynamic characteristics of the operating mechanism, the joints clearance sizes are selected as design variables, and correlated optimization works are performed. After that, the acceleration and reaction force curves of the mechanical system become smoother, and the amplitudes of the two curves are reduced distinctly.

Simulation Study on the Control Valve in Hydraulic Operating Mechanism of the High Voltage Circuit Breaker

2008 ◽  
Author(s):  
Wei Liu ◽  
Huayong Yang ◽  
Bing Xu ◽  
Zhongyu Wu
Keyword(s):  
High Voltage ◽  
High Speed ◽  
Circuit Breaker ◽  
Operating Time ◽  
Research Work ◽  
Control Valve ◽  
Simulation Software ◽  
Operating Mechanism ◽  
High Voltage Circuit Breaker ◽  
The Operating Mechanism

High voltage circuit breaker is an important interrupting device in a power system network. The operating mechanism is a key component of circuit breakers. The action of hydraulic operating mechanism in circuit breaker is different from general hydraulic mechanism for its high speed, short operating time and high pressure. In this paper, the working principle of hydraulic operating mechanism of 252kv high voltage circuit breaker is introduced. The high response speed solenoid pilot direction control valve is analyzed. The dynamic characteristic of the valve affects the performance of the hydraulic operating mechanism. Mathematical models of the valve and system have been developed. Simulations are carried out with AMESIM, hydraulic simulation software, and ANSOFT, electromagnetic simulation software. The characteristics of the operating mechanism control valve are discussed with the consideration of the influence of the geometry and environmental parameters. As the result of the research work, the simulation models and results provide the effectively theoretical guidance for the design and optimization of hydraulic operating mechanism.

On the dynamics of a spring-type operating mechanism for a gas-insulated circuit breaker in open operation using the Lagrange equation

2002 ◽  
Vol 216 (8) ◽  
pp. 831-843 ◽  
Author(s):  
F-C Chen ◽  
Y-F Tzeng
Keyword(s):  
Lagrange Equation ◽  
Equations Of Motion ◽  
Circuit Breaker ◽  
Operating Mechanism ◽  
Loop Method ◽  
Runge Kutta Method ◽  
Open Operation ◽  
Spring Type ◽  
The Operating Mechanism ◽  
Breaking Time

This paper investigates the dynamics of a spring-type operating mechanism of a gas-insulated circuit breaker in open operation. The vector-loop method is first used to derive the position, velocity and acceleration functions of each member of the operating mechanism. The equations of motion of the mechanism are then formulated using the Lagrange equation and solved by the fourth-order Runge-Kutta method. It has been shown in the analytical results that the breaking time of the circuit breaker is 0.076 seconds, which compares well with the experimental results.

A Methodology to Prevent Failure in Single Pole Reclosing Operations

2017 ◽  
Vol 18 (6) ◽  
Author(s):  
Pablo Mourente Miguel
Keyword(s):  
Transmission Line ◽  
Single Phase ◽  
Circuit Breaker ◽  
Electric Arc ◽  
Residual Current ◽  
Fault Current ◽  
Operating Mechanism ◽  
Operating Cycle ◽  
Earth Fault ◽  
The Operating Mechanism

AbstractAfter a phase to earth fault in a transmission line, opening of the circuit breaker poles at line extremities interrupts the fault current in the faulted phase. However, due to coupling between phases there is still a residual current through the electric arc, which is then denominated secondary arc. Interruption of the secondary arc defines if single pole reclosing operation will succeed. Nowadays, studies evaluate the likelihood of secondary arc interruption to define application of single phase reclosing. By several reasons, the secondary arc interruption may not occur leading the single pole reclosing operation to a failure. In this case, the circuit breaker pole has to open again and that depletes the energy stored in the operating mechanism. As the rated operating cycle of a fast reclosing circuit breaker is O – 0,3 s – CO – 15 s CO, a failure in the first reclosing shot makes necessary an interval longer than 15 s to perform a second reclosing shot. The methodology presented herein establishes a verification beforehand if a single pole reclosing will be successful. With the secondary arc still active, the single pole reclosing is blocked and the system proceeds to a three pole reclosing. Blocking of the first reclosing shot keeps the energy stored in the operating mechanism and the three pole reclosing shot may proceed with an interval of 300 ms.

Insights into the phenomenon of ‘bubble-free’ electrocatalytic oxygen evolution from water

2021 ◽  
Author(s):  
George Tsekouras ◽  
Richard Terrett ◽  
Zheyin Yu ◽  
Zhenxiang Cheng ◽  
Gerhard F. Swiegers ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Operating Mechanism ◽  
Evolved Gas ◽  
The Operating Mechanism

Understanding of the operating mechanism of a ‘breathable’ water-splitting electrode, which extracts evolved gas without forming bubbles, is advanced.

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