Xi'an Jiaotong University

Other

Yifei Wu

Fei Yang

Mingzhe Rong

Yi Wu

Chunping Niu

Jun Wang

Jinru Sun

Yu Xiao

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 7 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.

Generator circuit breaker control method based on short-circuit fault current symmetry

Headset

The present disclosure discloses a liquid arc extinguish chamber for direct current breaking. The liquid arc extinguish chamber for direct current breaking includes a cavity, a fixed contact and a moving contact. A liquid medium is sealed in the cavity. The fixed contact is hermetically fixed in the cavity. One end of the fixed contact is fixed in the cavity, and the other end of the fixed contact is connected with an outlet terminal A. The moving contact is movably sealed in the cavity. One end of the moving contact may adjacently abut against or be in contact with the fixed contact, and the other end of the moving contact is connected with an outlet terminal A

Liquid arc extinguish chamber for direct current breaking, direct current breaker and method thereof

The disclosure discloses a liquid arc voltage transfer based direct current breaker and a use method thereof. The direct current breaker includes a first connection terminal, a second connection terminal, a main current branch, a transfer branch and an energy dissipation branch. The main current branch is connected between the first connection terminal and the second connection terminal, and the main current branch includes a liquid break. The transfer branch is connected between the first connection terminal and the second connection terminal and is connected in parallel with the main current branch. The energy dissipation branch is connected between the first connection terminal and the second connection terminal and is connected in parallel with the main current branch and the transfer branch.

Liquid arc voltage transfer based direct current breaker and use method thereof

There is provided a direct current breaker based on vacuum magnetic blowout transfer and a breaking method thereof. The direct current breaker includes a first connection terminal, a second connection terminal, a main current branch, a transfer branch, an energy dissipation branch and a blowout unit. The main current branch is connected between the first connection terminal and the second connection terminal. During current conduction of the direct current breaker, current flows through the main current branch. The transfer branch is connected between the first connection terminal and the second connection terminal and connected in parallel with the main current branch. The energy dissipation branch is connected between the first connection terminal and the second connection terminal and connected in parallel with the main current branch and the transfer branch. The blowout unit is arranged between the main current branch and the transfer branch.

Direct current breaker based on vacuum magnetic blowout transfer and breaking method thereof

The present invention discloses a semiconductor assembly. The semiconductor assembly comprises a fully controlled power electronic device and a snubber circuit, wherein the snubber circuit is connected to the fully controlled power electronic device in parallel; the snubber circuit comprises a capacitor (C), an inductor (L), a resistor (R), a diode (D) and a half controlled power electronic device (A); the inductor (L) and the half controlled power electronic device (A) are connected in series and are together connected to the resistor (R) in parallel; and the diode (D) and the resistor (R) are connected in parallel and are together connected to the capacitor (C) in series.

Semiconductor assembly and control method thereof

The present invention provides a DC circuit breaker combining magnetic induction transfer and resistance current limiting, the circuit breaker comprising: a main current circuit, a current-limiting branch, a breaking branch, and an energy dissipation branch; the current-limiting branch and the breaking circuit each comprises a magnetic induction transfer module; an inductor in the magnetic induction transfer module of the current-limiting branch and a branch inductor in the current-limiting branch are coupled to form a mutual inductor; an inductor in the magnetic induction transfer module of the breaking branch and a second inductor in the transfer current loop are coupled to form a mutual inductor. The present invention can limit the current rising speed and amplitude and completely turned off the short-circuit current, thereby reducing the size and manufacturing cost of the circuit breaker. The main loop capacitance needs not be pre-charged; isolation between a secondary charging circuit and the main loop is realized; the discharging capacitance of the magnetic induction transfer modules adopt a bridge structure, which may two-way limit and break the fault current.

DC circuit breaker combining magnetic induction transfer and resistance current limiting

The present disclosure provides an arc-free DC circuit breaker that combines magnetic induction transfer and resistive current limiting. The circuit breaker comprises a main current circuit and a transfer current circuit. The transfer current circuit has a bridge structure; with a group of unidirectional components having a breaking function, bidirectional current breaking is implemented, such that compared with the prior art, usage of the turn-off devices may be reduced to half. By controlling action sequences of the trigger gap, high-speed switch, and power semiconductor, fast switching arc-free opening of the main current circuit is implemented; meanwhile, the breaking capability of the circuit breaker is significantly improved. By virtue of the current limiting module circuit inside the transfer current circuit, the present disclosure quickly limits short-circuit fault current, and then reduces the number of parallel groups of full-controlled devices of the breaking module circuit. Compared with the existing circuit breaker structures, usage of turn-off devices and cost of the circuit breaker may be significantly reduced.

Arc-free DC circuit breaker

The present disclosure provides a hybrid circuit breaker having a bridge induction transfer structure, characterized in that the circuit breaker comprises a main current circuit, an over-voltage limiting circuit, and a transfer current circuit; and the main current circuit, the over-voltage limiting circuit, and the transfer current circuit are connected in parallel. The induction transfer circuit in the transfer current circuit comprises an induction transfer inductor, an induction transfer capacitor, and an induction transfer branch power semiconductor device which are connected in series; the transfer current circuit further comprises a bridge circuit comprised of a main loop capacitor; the main loop inductor and the induction transfer inductor are coupled to form a transformer. The present invention can implement fast breaking of the current, and effectively reduce the volume and manufacturing cost of the circuit breaker. With the induction transfer circuit, fast current transfer is implemented. The main loop capacitor needs no pre-charging. Isolation between the secondary charging circuit and the main loop is implemented. The transfer speed is fast, and the breaking reliability is high.

Hybrid circuit breaker having a bridge induction transfer structure

The present invention discloses a magnetic pulse inducted transfer-type DC circuit breaker. The DC circuit breaker comprises a main current circuit and a transfer current circuit, the main current circuit comprising a combination of a fast mechanical switch or a mechanical switch with a power electronic device; the transfer current circuit comprises an arrester and a mutual inductor. The voltage generated through a mutual inductor may directly transfer current to the arrestor, thereby eliminating a process of transfer of the current to the capacitor or a power electronic device; it has a high current limiting or breaking speed, with a stability far superior to traditional technologies. The isolation between the capacitance charging unit and the DC system significantly reduces the voltage level and size of the charging unit, and enhances action reliability. The power semiconductor devices or trigger gaps are used at the primary side of the mutual inductor of the transfer current circuit form a bridge circuit, thereby realizing bidirectional current transfer; the bridge circuit is voltage-withstanding and low-cost.

Magnetic pulse inducted transfer-type DC circuit breaker

A hybrid DC breaker, comprises a main current circuit, a transfer current circuit, an over-voltage limiting circuit and a control system, wherein the main current circuit, the transfer current circuit and the over-voltage limiting circuit are connected in parallel. The transfer current circuit consists of circuits-, wherein the circuitand the circuitare connected in series at first and then connected with the main current circuit in parallel; a pre-charged capacitor is connected with the circuitin parallel after being connected with the circuitin series; and, one end of the circuitis connected with the left end of the main current circuit while the other end thereof is connected with a connection point of the pre-charged capacitor and the circuit

Hybrid DC breaker

A bidirectional hybrid breaker comprises a main current circuit, a transfer current circuit, an over-voltage limiting circuit and a control system, wherein the main current circuit, the transfer current circuit and the over-voltage limiting circuit are connected in parallel. The transfer current circuit consists of circuits-, wherein the circuitand the circuitare connected in series at first and then connected with the main current circuit in parallel; a pre-charged capacitor is connected with the circuitin parallel after being connected with the circuitin series; and, one end of the circuitis connected with the left end of the main current circuit while the other end thereof is connected with a connection point of the pre-charged capacitor and the circuit

Bidirectional hybrid breaker

A hybrid high-voltage DC breaker, consists of a plurality of completely identical breaker modules connected in series. Each of the breaker modules comprises a main current circuit, a transfer current circuit, an over-voltage limiting circuit and a control system, wherein a high-speed mechanical switch, the transfer current circuit and the over-voltage limiting circuit are connected in parallel. The transfer current circuit consists of circuits-, wherein the circuitand the circuitare connected in series at first and then connected with the main current circuit in parallel; a pre-charged capacitor is connected with the circuitin parallel after being connected with the circuitin series; and, one end of the circuitis connected with the left end of the main current circuit while the other end thereof is connected with a connection point of the pre-charged capacitor and the circuit

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Xi'an, China

Yifei Wu