Oscillation transfer and solid-state switch combined direct-current circuit breaker

Abstract

The invention provides an oscillation transfer and solid-state switch combined direct-current circuit breaker, which is composed of a main current loop, a current transfer branch, an energy absorptionbranch and a control system. According to the invention, under the condition of small current on-off, a high-speed mechanical switch is controlled to be switched off to be connected with a corresponding power electronic device, current is transferred to a current transfer branch under the action of arc voltage, and then the power electronic device is controlled to be switched off, voltage at thetwo ends of a power electronic assembly rises and a lightning arrester is controlled to be connected; when a large-current short-circuit fault occurs, the high-speed mechanical switch is controlled tobe switched off to be conducted with the power electronic device; and a pre-charging capacitor injects reverse current into the fracture, the fracture current is subjected to zero-crossing arc extinguishing, short-circuit current is transferred to the current transfer branch and charges the capacitor, and when the capacitor voltage is greater than the lightning arrester conduction voltage, the lightning arrester is conducted. The novel direct-current circuit breaker has the characteristics of simple structure, low on-state loss, high full-current breaking speed and the like.

Description

technical field

[0001] The invention relates to a direct current circuit breaker combining oscillation transfer and solid-state switch, especially by adding a trigger switch to the current transfer branch, and using two methods to break currents of different levels. Realize the function of quick disconnection of short-circuit faults under various current conditions of the medium-voltage DC system. Background technique

[0002] With the continuous advancement of urban construction, the development of high power supply density, large capacity, and high reliability DC power distribution system has become an urgent need for the development of large and medium-sized cities. The operating conditions of some special power systems are complex. The traditional DC circuit breaker, due to its long breaking time and limited current limiting capacity, cannot take into account the limitations of different working conditions and other characteristics at the same time, and it is difficult ...

Examples

Embodiment Construction

[0024] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

[0025] figure 1 It is a schematic diagram of the structure of the circuit breaker body, including the main current circuit, the transfer current circuit and the energy absorption circuit.

[0026] figure 2 The breaking process of the circuit breaker under the rated current condition or small current condition of the system is given. will be combined below figure 2 Describe this breaking process.

[0027] (1), such as figure 2 (a) In the normal flow state shown in (a), the system current flows in from the outgoing terminal A1, and flows out from the outgoing terminal A2 after passing through the high-speed mechanical switch;

[0028] (2), such as figure 2 As shown in (b), when breaking is required, the high-speed mechanical switch is triggered to open, the trigger switch is turned on, and the power electronic components are trigg...

technical field

[0001] The invention relates to a direct current circuit breaker combining oscillation transfer and solid-state switch, especially by adding a trigger switch to the current transfer branch, and using two methods to break currents of different levels. Realize the function of quick disconnection of short-circuit faults under various current conditions of the medium-voltage DC system. Background technique

[0002] With the continuous advancement of urban construction, the development of high power supply density, large capacity, and high reliability DC power distribution system has become an urgent need for the development of large and medium-sized cities. The operating conditions of some special power systems are complex. The traditional DC circuit breaker, due to its long breaking time and limited current limiting capacity, cannot take into account the limitations of different working conditions and other characteristics at the same time, and it is difficult ...

Examples

Embodiment Construction

[0024] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

[0025] figure 1 It is a schematic diagram of the structure of the circuit breaker body, including the main current circuit, the transfer current circuit and the energy absorption circuit.

[0026] figure 2 The breaking process of the circuit breaker under the rated current condition or small current condition of the system is given. will be combined below figure 2 Describe this breaking process.

[0027] (1), such as figure 2 (a) In the normal flow state shown in (a), the system current flows in from the outgoing terminal A1, and flows out from the outgoing terminal A2 after passing through the high-speed mechanical switch;

[0028] (2), such as figure 2 As shown in (b), when breaking is required, the high-speed mechanical switch is triggered to open, the trigger switch is turned on, and the power electronic components are trigg...

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