Abstract: The disclosure discloses a generator circuit breaker control method based on short-circuit fault current symmetry. The method includes: collecting, by a control device, current on an outlet side of a generator in real time; calculating a transferring current feeding moment based on a current symmetry method when fault current rises to a peak value after a short-circuit fault occurs; correcting the transferring current feeding moment by a correction coefficient; and then calculating a breaker switching moment, thereby realizing precise control on a generator circuit breaker. The method mainly addresses the situation that the existing control method cannot effectively cope with the complexity of the short-circuit fault current on the outlet side of the generator, and fills the blank of the effective method for short-circuit control of the generator circuit breaker.

Abstract: A generator circuit breaker includes a main current branch, a current-limiting transfer branch, a freewheeling branch and a fast switch. The main current branch includes a high-speed mechanical switch S1 and a high-speed mechanical switch S2 in parallel, wherein two ends of each of breaks of the high-speed mechanical switch S1 and the high-speed mechanical switch S2 are directly connected with wire outlet ends of the circuit breaker respectively. One end of the current-limiting transfer branch is connected in parallel to one end of the main current branch and the other end of the current-limiting transfer branch is connected with the other end of the main current branch via a fast switch S3, wherein the current-limiting transfer branch includes a transfer capacitor C, an inductor L, thyristor components T1 and T2, and a current-limiting resistor R.

Abstract: A lightning damage assessment method for the carbon fiber reinforced polymer (CFRP) material considering non-linear impedance characteristic includes steps of: studying various influencing factors of the lightning damage of the CFRP material under the action of the single lightning current component; obtaining the law between the lightning damage of the CFRP material, including the lightning damage area and depth, and various influencing factors, including the peak value, the rising rate, the charge transfer amount, the specific energy of the single lightning current component, and the non-linear impedance characteristic of the CFRP; on the basis of the law, building the multi-factor assessment model of the lightning damage of CFRP material under the action of the single lightning current component; and obtaining mathematical expressions between the lightning damage of the CFRP material and the influencing factors.

Abstract: A lightning damage assessment method for the carbon fiber reinforced polymer (CFRP) material considering non-linear impedance characteristic includes steps of: studying various influencing factors of the lightning damage of the CFRP material under the action of the single lightning current component; obtaining the law between the lightning damage of the CFRP material, including the lightning damage area and depth, and various influencing factors, including the peak value, the rising rate, the charge transfer amount, the specific energy of the single lightning current component, and the non-linear impedance characteristic of the CFRP; on the basis of the law, building the multi-factor assessment model of the lightning damage of CFRP material under the action of the single lightning current component; and obtaining mathematical expressions between the lightning damage of the CFRP material and the influencing factors.

Abstract: A method for calculating the damage of a carbon fiber composite reinforced polymer (CFRP) composite under an action of a single lightning current component with a fast-rising rate is disclosed. Through the obtained dynamic impedance curves of the CFRP composite under the action of the non-destructive lightning current component, the anisotropic conductivity of the CFRP composite under the action of the single lightning current component with specified parameters is extrapolated based on pre-designed lightning damage simulation conditions. The anisotropic conductivity is taken as the initial condition of the conductivity of the CFRP composite in the coupled thermoelectric simulation model, which is able to better simulate the real lightning effect on the CFRP composite, and is able to more accurately obtain the lightning damage of the CFRP composite and analyze the relationship between the lightning damage parameters.