Exactly What Is a Computerized Transfer Switch And What’s the Benefit of Using One?

Inside an emergency electric power system, an automated transfer switch transfers a building’s electric source from the primary source to a secondary one, typically from commercial supply to back up power generator supply. Along with performing automatically, transfer switches can also be designed to operate manually, a method commonly used in domestic and commercial settings, but not in situations where constant electricity is required to maintain vital functions. When an emergency power system runs with an automatic switch, it contains one of the following types of switches: open transition, or closed transition.

1. Closed Transition

Also called «make before break» switches, open transition types switch a building from commercial electrical power to generator power before ending its connection to the first kind, allowing entities which need a continual supply of electricity (e.g. hospitals, data centers, and security organizations) to safeguard against any period of outage, no matter brief. The implementation of closed transition models typically involves special load synchronization considerations, for example: balance in voltage between your primary and secondary power source; the difference in frequency (Hz) between your sources; and also the difference in relative phase angle between the sources. Proper synchronization between primary and secondary energy sources ensures an overlap time under 100 milliseconds.

2. Open Transition

Also called «break before make» switches, open transition units switch a building from industrial electrical power to power generator electricity after ending its link with the former. Unlike closed transition units, open transition models are ideal for entities that do not require constant electric supply. Generally found in household settings, open transition models will also be common in a few kinds of retail stores and office buildings. From a technical standpoint, the main benefit of open transition is its insurance that generator energy won’t backfeed to the commercial supply line. However, properly implemented closed transition models will also be effective at preventing the unwanted effects of backfeeding.

Contacting Generator Services for Transfer Switch Options

Because of its infrequency of use and long lifespan, it’s not uncommon for any building to have transfer switch equipment that does not accommodate the requirements of its current inhabitant, specifically in the case of manual switches. But, even if the need for new devices is obvious, talking to an emergency power supply service before you make a purchase could bring two benefits: it could prevent the unnecessary buying new equipment, also it could lower cost of implementation. For example, rather than buying new equipment, retrofitting current equipment with new parts, as well as refurbishing existing parts, may be the simplest and most affordable solution. Emergency power services are also the perfect source for normal backup generator maintenance, in addition to guidance on which kind of emergency energy arrangement works best in your building.

While preparing to write this article, I learned a lot about emergency power systems and switchgear maintenance at PrimePower.com.