Reliability Of Circuit Breaker Research Articles

Research and Design of Three-Phase Inconsistent Protection Circuit for Circuit Breaker Based on Chip Technology

The typical configuration of inconsistent protection of circuit breaker is that the auxiliary switch of circuit breaker is connected in series and parallel with start-up time relay, and the outlet relay is tripped by delay start-up. In order to improve the reliability of circuit breaker, this paper presents a new design idea of inconsistent protection of circuit breaker based on chip technology, and presents a phased digitized site designed with circuit breaker mechanism as a whole. The overall architecture scheme mainly consists of module and general control module. The phase-separated digitized local module realizes on-site acquisition of circuit breaker position and optical fiber transmission. The main control module realizes ontology inconsistent logic operation, exit and communication with spacer layer. The design scheme uses chip processing instead of traditional relay and optical fiber transmission instead of traditional cable, effectively avoiding relay and circuit differences. The misoperation often caused can greatly improve the reliability of inconsistent protection of circuit breaker.

Reliability Research of Vacuum Circuit Breaker Based on Degradation

As one of the terminal equipments of power system, circuit breaker plays the role of control, regulation and protection, and its reliability level has an important impact on the stability of power system. The key point of reliability research of circuit breaker is mechanical reliability. Aiming at the research of mechanical reliability of vacuum circuit breaker, in order to make full use of the process information of circuit breaker failure, this paper uses the method of reliability modeling based on degradation to do tens of thousands of degradation tests on six 12 KV permanent magnet vacuum circuit breakers, and uses the principal component analysis method to determine the degradation amount of overrun to establish the degradation process model. According to the over-range degradation data, Weibull distribution is used to establish the degradation distribution model, and the corresponding model parameters are calculated, and the reliability function and the reliability comparison curve are given.

Modeling and Simulation of Flexible Transmission Mechanism with Multiclearance Joints for Ultrahigh Voltage Circuit Breakers

The transmission mechanism, of which the dynamic characteristics determine the reliability of the circuit breaker, is the principal component of the ultrahigh voltage (UHV) circuit breaker. The characteristics of transmission mechanism are quick motion, high sensibility, and high reliability. The transmission mechanism with multiclearance joints present strong no-linear vibration feature which strongly affects the reliability of the UHV circuit breaker. In this investigation, a planar rigid-flexible coupling model of the transmission mechanism considering the clearance joints and the flexibility of components is established by using ADAMS software. The dynamic contact model in clearance joints is performed, based on clearance vector model of clearance joint. Then, the reliability of the model is proved by means of comparing the results of experiments. The simulation results show that the dynamic response of the mechanism is greatly influenced by the clearance and the flexibility of components has a role of suspension for the mechanism. Moreover, the influence of the clearance size, input speed, and number of clearance joints on the dynamic characteristics of the mechanism are also investigated.

Linear Servo Motor Operating Mechanism and Control Technique for High-Voltage Circuit Breaker

The linear servo motor mechanism for high-voltage circuit breaker is presented and the control to new operating mechanism is analyzed according to the d-q axis mathematics model and the thrust characteristics of the permanent magnetic synchronous motor. The three closed-loop control schemes of location, speed and current for moving contact control is designed and executed on DSP. The high accuracy grating is chosen as the speed and location sensors by which the requirement for real-time and high accuracy in the system can be fulfilled. The control and regulation of the moving contact movement during opening and closing of the high-voltage circuit breaker are realized which make the movement curve the same as the ideal one. The opening and closing abilities and running reliability of circuit breaker are enhanced and the mechanical and electrical lifespan is improved.