STS static transfer switch

STS is a dual-input AC converter switch, and the other way is disconnected, and the one AC input is used to power the load. When the power supply is abnormal, STS will automatically switch to the other power supply to ensure that the load is continuously supplied by the other power supply.

The high-speed static contact-less switching principle design adopted by STS AC dual power switching device has the following characteristics

◆ Adopt full digital control, strong anti-interference ability, fast operation speed;

◆ Switch time ≤4ms, high reliability;

◆ Strong overload capacity, can withstand the full load boot;

◆ With the input of under-pressure, over-current and other protection functions;

◆ The front panel is equipped with a display screen and an indicator light to intuitively understand the STS status information;

◆ Provide fire line, zero line can be switched simultaneously STS version, appearance structure, performance is exactly the same.

The high-speed static contact-less switch principle adopted by STS is designed to realize the safe and fast switching of AC power supply, ensuring the 4ms switching in the case of resistance load, perceptual or capacitance load.

The basic principle box of STS is shown in Figure 1-1/1-2. The input power loop I (hereinafter referred to as the main power supply) and the input power loop II (hereinafter referred to as the standby power supply) are respectively connected in parallel to the output end by the static switch. Two independent auxiliary power inputs are taken from I and II roads respectively, and they supply the logic circuit inside the device to ensure that the internal logic is not affected when any input power is lost.

Figure 1-1

Figure 1-1

When the STS is working normally, the DSP core control unit monitors that the main power input is normal, the static switch of the control main power circuit is closed, the static switch of the standby circuit is turned off, and the main power output supplies power to the load.

When the STS is working normally, when the DSP core control unit monitors that the main power supply input is abnormal, and also monitors that the standby power supply input is normal, the static switch of the control main power supply circuit is disconnected, the static switch of the standby circuit is closed, and the standby power supply output supplies power to the load.

When STS works normally, if the main power supply is lost or under-voltage, the DSP core control unit monitors the main power input and the control unit automatically seeks to switch, if the static switch of the standby power circuit is disconnected, the static switch of the main power circuit is closed, and restore the main power output to the load.