Secondary arc analogue simulation apparatus and method for transmission line

Abstract

The invention provides a simulating analog device of a transmission line secondary arc and a method thereof, which adopt the following technical proposal: the arcing situation of an arc channel is simulated by adopting a nonlinear time-varying resistance, and the arc channel resistance satisfies a dynamic equation which is established according to arc conservation of energy; a real-time secondary arc length is obtained according to arc movement characteristics by analyzing electrodynamic power, wind load and air resistance of an arc in movement and is used for modifying an arc length in the arc resistance equation; and by combining the characteristics of secondary arc current, whether self-extinguishing of the arc can be achieved is judged according to a change rate of the arc channel resistance when the arc current runs through a zero zone. A nonlinear differential equation which applies mathematical methods to solve the arc resistance occurs the electromagnetic transient process of the secondary arc with a computing system connected with an external circuit, and an the self-extinguishing time of the secondary arc is obtained by the arc channel resistance criterion during the zero-rest period of the arc current.

Description

technical field [0001] The present invention relates to the field of power system overvoltage, in particular to a simulation device and method for submerged power supply arc of transmission line, which is used to simulate the electromagnetic transient process of submerged power supply arc in the simulation system, so as to obtain the voltage, current and length of submerged power supply arc And self-extinguishing time and other characteristics. Background technique [0002] On-site operation and accident statistics show that single-phase ground faults in transmission lines with voltage levels of 110kV and above in my country account for more than 90% of the total line faults. The self-extinguishing feature will affect the intermittent time of no current and the success rate of single-phase reclosing. The submerged arc of the transmission line moves freely in the atmosphere and is in an open atmospheric environment, which belongs to the long gap free arc. The submerged arc g...

AI Technical Summary

Problems solved by technology

[0006] To sum up, the simulation test of transmission line submerged arc and the simulation of submerged arc in the prior art have failed to reveal the physics of submerged arc. In essence, it must be divided into two steps to determine the self-extinguishing time of the submerged arc of the transmission line, resulting in a cumulative error

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