ATS / CTTS comparison and features

● ATS (Automatic Transfer Switch)

A switch that connects the two power lines of the KEPCO line and the emergency generator line in water and substation facilities to automatically control the emergency generator to operate when the KEPCO line is disconnected.

● CTTS (Closed Transition Transfer Switch)

Unlike the open transfer of the general ATS,it is a closed transfer. When the phase angle,constant voltage,and constant frequency are established by operating the generator in advance,if the frequency and voltage synchronization of the KEPCO power and generator power are established,parallel operation for less than 100ms and then uninterrupted to the generator side. Switch to be transferred.

Advantages of CTTS

● Generator protection

Since CTTS is converted in synchronization with uninterrupted power,it does not put stress on the generator side and helps extend the life of the generator accordingly.

● Protection of UPS and UPS BATTERY and life extension possible

Since CTTS is switched over by uninterrupted power,it lowers the probability of using the battery and at the same time reduces the possibility of malfunction of the UPS inverter,prolonging the lifespan and protecting the device.

● Protection of electric motors and other computing equipment and life extension possible

It is easy to manage because there is no need to reset according to power failure and recovery,such as a thermo-hygrostat.

● Protection of critical load in case of UPS inverter failure

In the event of a UPS inverter failure,start the generator in advance,and then use the UPS's SBS (Static Bypass Switch) to transfer uninterrupted power to the power generation side in advance to cope with KEPCO's instantaneous power outages or frequency fluctuations.