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Breaker

Implement circuit breaker opening at current zero crossing 实现电路断路器在电流过零时断开 Library Elements Description

The Breaker block implements a circuit breaker where the opening and closing times can be controlled either from an external Simulink signal (external control mode), or from an internal control timer (internal control mode).

断路器模块实现了开闭时间由外部Simulink信号（外部控制模式）或内部控制定时器（内部控制模式）可控的电路断路器。

A series Rs-Cs snubber circuit is included in the model. It can be connected to the circuit breaker. If the Breaker block happens to be in series with an inductive circuit, an open circuit or a current source, you must use a snubber. 一系列Rs-Cs缓冲电路包含在模型中。它可以连接到断路器。如果发生断路器模块串联一个电感电路、一个开路或一个电流源，你必须使用一个缓冲电路。

When the Breaker block is set in external control mode, a Simulink input appears on the block icon. The control signal connected to the Simulink input must be either 0 or 1 (0 to open the breaker, 1 to close it).

当断路器块被设置在外部控制模式下，模块图标上出现的Simulink输入端。连接到Simulink的输入端控制信号必须是0或1（0打开断路器， 1关闭）。

When the Breaker block is set in internal control mode, the switching times are specified in the dialog box of the block.

当断路器块被设置在内部控制模式下，开关时间在模块的对话框中指定。

When the breaker is closed, it is represented by a resistance Ron. The Ron

value can be set as small as necessary in order to be negligible compared with external components (a typical value is 10 mohms). When the breaker is open, it has an infinite resistance.

当断路器闭合，它由内部电阻代表。 为了与外部元件（典型值是10毫欧）相比是可以忽略的，内部电阻值有必要设置的很小。当断路器是断开的，它具有无穷大的电阻。

The arc extinction process is simulated by opening the breaker device when its current passes through 0 at the first current zero crossing following the transition of the Simulink control input from 1 to 0.

Simulink的控制输入从1变为0且在第一次电流过零点，断路器的电流过零时， 灭弧过程由断开的断路器设备模拟。

Operation动作 The Breaker closes when 闭合

Conditions条件 Control signal goes to 1 (for discrete systems, control signal must stay at 1 for at least 3 times the sampling period)控制信号变为1（离散系统，控制信号必须至少在3次采样周期保持为1） Operation动作 The Breaker opens when 断开

Conditions条件 Control signal goes to 0 控制信号变为0

Breaker current passes through 0 断路器电流过零

Note注意

The Breaker block may not be the appropriate switching device to use for DC circuits. For such applications, it is recommended that you use the Ideal Switch block as a switching device.

对于直流电路，断路器块可能不是合适的开关设备。 对于这样的应用，建议你使用理想开关模块作为开关器件。

Dialog Box and Parameters对话框和参数

Breaker resistance Ron 内部电阻

The internal breaker resistance, in ohms (Ω). The Breaker resistance Ron parameter cannot be set to 0.

断路器内部电阻，单位是欧姆。断路器内部电阻参数不能设置为0。

Initial state 初始状态

The initial state of the breaker. A closed contact is displayed in the block icon when the Initial state parameter is set to 1, and an open contact is displayed when it is set to 0.

断路器的初始状态。 当初始状态参数设置为1时，一个常闭触点显示在模块图标上；当它被设置为0时，显示常开触点。

If the breaker initial state is set to 1 (closed), the software automatically initializes all the states of the linear circuit and the Breaker block initial current,