STATIC TRANSFER SWITCH

Static Transfer Switches ensure seamless, trouble-free switching between a main energy source and a backup energy source. Static transfer switches are produced within certain tolerances for desired frequency and voltage values. The static transfer switches monitor the AC input and immediately change the energy source if the values exceed the specified tolerances. Static transfer switches attempt to perform continuous operation as soon as possible during load transfer. If there are critical loads between the two energy sources, power cut-off creates problems in the system. Therefore, static transfer switches are needed for continuous transfer. If the transmission was performed manually, there would be a power cut in this process. Because people cannot detect and transfer these transmissions in as short as 2 milliseconds. STSs control continuous energy sources, detecting values within 2 milliseconds if the values are out of tolerances, and transferring them in a short time allows uninterrupted energy flow.

In the system where static transfer switches are used, one of the sources is encoded as the main source (preferred source) and the other as the backup source (alternative source). In other words, the preferred source will be used as the first priority in the software of STS. If the energy remains within the specified tolerances, the system will continue to be supplied from the preferred source. If the static transfer switch detects a situation where the values are out of tolerances, it will immediately turn to the alterative source and the system will continue to feed the loads from the alternative source. While production of static transfer switches, the desired tolerance values of the energy, which source will be the preferred source and which will be the alternative source can be determined. The most important point to be considered during the production phase is that the resources do not overlap. The transmission is one-way. Otherwise, the resources may conflict and cause 2 resources to become unusable. When talking about static transfer switches, people can think of uninterruptible power supplies. Can uninterruptible power supplies be used as static transfer switches?

Uninterruptible power supplies feed the system as AC energy by converting the DC energy it receives from the batteries in case of power failure. Static transfer switches ensure uninterrupted transfer between two energy sources. To give an example of the application areas of static transfer switches; It is used for the transfer of energy from one to the other in the transition between the generator and the grid, where there are two uninterruptible power supplies, where there are two energy networks.

Modes and transfers used in static transfer switches:

Normal mode: When the STS is in normal mode, the load is supplied from the preferred source.

Emergency transfer: If the energy in the preferred source is not between the specified tolerances, energy starts to be taken from the alternative source within 2 milliseconds. The most important point here is not to de-energize the load. To avoid damaging both the resources and the load, the transfer process is performed with a special algorithm. If the values return to tolerance ranges in the preferred source and improve, the STS directs the energy intake to the preferred source. This retransmission process can be set manually or automatically, and the duration also can be set.

ESN ENERGY- 1 PHASE STATIC TRANSFER SWITCH

ESN Energy- STS
  • Intelligent control and high reliability with DSP (Digital Signal
    Processor)
  • Thyristor-controlled switching (fully static)
  • Emergency transfer and manual transfer modes
  • 2 x 16-character LCD Graphic touch user module (HMI) that can display
    measurement, status and alarm messages Option
  • Led indicators where the status of the static transfer switch can be easily
    monitored.
  • Audible alarm and LED test.
  • Extremely low failure due to 4 parallel power supplies. Built-in
    maintenance bypass switch
  • Redundant and status monitoring power supplies
  • Possibility to calibrate measurement sizes from the front panel
  • Front panel language selection (English, German, Turkish, Dutch,
    Portuguese)
  • Input Low / High, Output Low / High, Over Temperature, Short-circuit
    protections
  • Program all working sizes (password protected)
  • General alarm relay output
  • Monitoring and control via RS232-RS485, Modbus (RTU)
    Communication
  • Up to 200 date and time event logs
  • Thyristor failure detection
  • Natural cooling to a certain power

ESN ENERGY- 3 PHASE STATIC TRANSFER SWITCH

3 phase STS
  • Intelligent control and high reliability with DSP (Digital Signal
    Processor)
  • Thyristor-controlled switching (fully static)
  • Emergency transfer and manual transfer modes
  • 2 x 16-character LCD Graphic touch user module (HMI) that
    can display measurement, status and alarm messages Option
  • Led indicators where the status of the static transfer switch can
    be easily monitored.
  • Audible alarm and LED test.
  • Extremely low failure due to 4 parallel power supplies. Built-in
    maintenance bypass switch
  • Redundant and status monitoring power supplies
  • Possibility to calibrate measurement sizes from the front panel
  • Front panel language selection (English, German, Turkish, Dutch,
    Portuguese)
  • Input Low / High, Output Low / High, Over Temperature, Shortcircuit
    protections
  • Program all working sizes (password protected)
  • General alarm relay output
  • Monitoring and control via RS232
  • Up to 200 date and time event logs
  • Thyristor failure detection
  • Natural cooling to a certain power
  • Automatic and Manual Transfer