A static transfer switch (STS) is a commonly used device in power systems, primarily used in environments such as data centers and server rooms to ensure the continuity and reliability of power supply. Today, let's learn about static transfer switches.
Definition of a static transfer switch
A static transfer switch is a dual-input transfer switch. Normally, one input is active and the other is disconnected, allowing power to be supplied to the load from one AC input. If one power source fails, the STS automatically disconnects the active input and connects the other, seamlessly transferring the load to the alternate power source.
Working Principle of Static Transfer Switch
Automatic detection
Power quality monitoring: Continuously monitors the voltage, frequency, and waveform of the primary and backup power sources to ensure they are within acceptable ranges.
Power status detection: Detects whether the power source is functioning properly so that switching can be performed as needed.
Switching process
Signal transmission: The control unit receives power status information and decides whether to initiate a switching operation based on preset conditions.
Switching execution: Based on the control unit's instructions, the current power input is shut down and the backup power input is opened, achieving a fast and smooth switchover. Response Time
Millisecond-level response: Static transfer switches typically have extremely short response times, completing power switching within milliseconds, ensuring continuous power supply to equipment.
Static Transfer Switch Structure
Controller
Logic Control Unit: Responsible for monitoring power status and controlling switching operations.
Communication Interface: Used for communicating with other devices or systems to exchange information.
Switching Device
Relay/Transistor: Used to switch power input, ensuring safety and reliability.
Voltage Sensor: Monitors power supply voltage changes and provides the controller with information for appropriate decisions.
Additional Functions
Overload Protection: Monitors current load to prevent equipment damage from overload.
Temperature Monitoring: Monitors equipment temperature to prevent overheating.
Applications of Static Transfer Switches
Data Centers
Ensuring Business Continuity: Data centers require a continuous power supply. STS ensures immediate switchover to backup power in the event of a power failure.
Medical Equipment
Protecting Critical Equipment: Medical equipment has stringent requirements for power quality. STS ensures continuous and stable operation of medical equipment. Communication base stations
Ensuring smooth network operation: Communication base stations require high power stability. STS can quickly switch power supply in the event of power outages, ensuring smooth communication networks.
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