Critical power for factories. Zero transfer time at medium voltage.

The production loss outlasts the electrical event.

The electrical event is short. The production loss is not. Three costs follow an outage, a sag or a short interruption, and the site study prices each one for the plant.

• Scrapped batches. Material in an extruder, a furnace, a reactor or a coating line when the power drops often cannot be recovered. The batch is scrap and the equipment has to be cleaned out before it runs again.
• Restart time. A continuous line comes back in sequence: utilities, controls, temperatures, then product. The restart can take hours after an interruption that lasted less than a second.
• Damaged drives. A sag can trip variable-speed drives on undervoltage. An uncontrolled stop and a restart onto a recovering grid stress drives, motors and tooling.

Plants on a weak or congested grid see these events often. Critical power for factories in Mexico collects the public figures for one such market.

In dual conversion the process never changes source.

Dual conversion puts the UPS block in series with the load. A grid-side converter draws from the utility, a battery sits on the direct-current connection behind it, and a load-side converter forms the voltage for the process line. The line is always fed through that load-side converter.

When the grid sags or disappears, nothing switches. The load-side converter keeps forming the voltage from the battery, so the transfer time is 0 ms and the outage or sag does not reach the process. This holds within the block’s rating and for as long as the battery reserve lasts.

Only the loads that need it go behind the blocks. The rest of the plant stays on the utility feed, which keeps the UPS sized to the critical line and not to the whole site.

Parallel fits a plant that keeps its UPS and generators.

Parallel puts the blocks beside the load, on a medium-voltage feeder or at the plant bus. The feeder reaches the process without passing through the blocks, and the plant keeps its existing UPS and generators.

The blocks then do three jobs. They support the feeder voltage through a sag and, in the distributed arrangement, form voltage and frequency for their feeder section if the feeder opens, within their rating and duration. They improve power quality at the plant bus. With capacity above the reserve, they lower demand charges and energy cost where the tariff rewards it.

Transfer time in parallel is set by the plant’s own UPS. A process with no UPS of its own, and no tolerance for a sag, belongs behind dual conversion.

The two configurations can be combined on one site. The medium-voltage UPS page compares them line by line.

The battery bridges to the generators or covers the outage.

Battery duration is 1 to 4 hours, with custom durations on request. That energy does one of two things.

Where the plant keeps its generators, the battery carries the critical line while they start and take the load. The process does not see the handover, and the generators cover an outage of any length the fuel allows.

Where the battery is to stand in for the generators, the condition is duration. The battery can take their place only where its duration covers the plant’s continuity requirement, which the owner sets. An outage longer than the reserve ends in a controlled shutdown, so the requirement has to come from the plant’s outage history and not from an average.

Battalion EMS holds the reserve as a dispatch constraint. Demand-charge management and energy shifting use only the capacity above it.

Class values for the medium-voltage UPS.

The study starts from the plant single-line diagram, the disturbance history and the process tolerance. Factories and industrial power covers the wider plant: generator coordination, process loads and the tariff. Request information for your plant.