UST SagFighter

UST SagFighter

Power through voltage sags and other common electrical events.

The UST SagFighter protects against costly production stops and manufacturing errors due to voltage sags. It provides must-have protection for all continuous production processes and other power-critical applications, and can be custom-configured to meet specific engineering specs.

Operating without batteries or energy storage of any kind, the near-zero maintenance SagFighter monitors and actively corrects incoming voltage within 2 milliseconds.

SagFighter Features

      • SEMI F47 compliant
      • Battery free and near-zero maintenance – no service/maintenance
        contracts needed
      • Full sag correction within 2 milliseconds
      • Sag correction duration independent of load or power factor
      • Sag correction for 100 seconds minimum
      • Robust industrial design – offering continuous protection for industrial
        loads (motors, production machinery, etc.), with no need for bypass
        operation even during adverse inrush (high current) conditions
      • Continuous protection without needing to recharge or reset
      • Input circuit breaker provided as standard, optional maintenance bypass
        arrangements also available
      • Custom enclosure designs available to meet indoor or outdoor site
      • Non-continuous inverter operation that increases reliability and provides
        99% efficiency during normal operation

Unlike computer-grade products or uninterruptible power supplies (UPS), the industrial-grade SagFighter is designed for typical production environment loads where high inrush conditions can occur. There is no need to oversize SagFighter given its robust design scheme and superior overload protection characteristics (1,000% for 1 second). SagFighter is available in a full range of sizes, from 50kVA to 2,500kVA, to meet any application demand.

The SagFighter™ active voltage conditioner continuously monitors the input voltage waveform for any deviation from a balanced, three-phase voltage. Upon sensing a deviation, the SagFighter engages an inverter circuit to apply an injection voltage to the primary windings of the series-connected transformer. The injection voltage is synthesized with a magnitude, shape, and phase angle so that when it is added in series with the incoming voltage, a balanced, three-phase voltage results. When normal, three-phase incoming voltage is detected at the SagFighter input, the inverter circuit is disengaged and the unit returns to monitoring mode.

The SagFighter is thermally ranged to provide continuous correction for a voltage sag, although this is not normally required.

The SagFighter uses natural convection cooling and has no fans or other moving parts. Larger units may include heat-sink fans that operate only when the unit is correcting a sag event. An automatic electronic failsafe bypass is incorporated into the standard design so the SagFighter maintains power to the load if a unit malfunctions.

The SagFighter automatically corrects voltage sags with no operator or programming required. The unit display provides unit status and historical information on sag correction events. Alarm contacts are also provided to permit remote indication of SagFighter status.

SagFighter installation is simple. The unit arrives completely assembled and requires no programming, testing, measuring or setting of switches. It is designed to install much like a dry-type transformer: simply place the unit and make input and output wiring connections. The SagFighter typically has no maintenance schedule other than routine inspection and cleaning.

Standard Input/Output 3-Phase Voltages60Hz: 208, 480, 600
50Hz: 220, 380, 400, 415

Regulation / Operating Characteristics
Sag Correction - Single Phase voltage event (sag)80% sag (20% remaining voltage) corrected to 95% of nominal voltage. 90% sag (10% remaining voltage) corrected to 90% of nominal voltage.
Sag Correction - 3- Phase voltage event (sag)40% sag (60% remaining voltage) corrected to 95% of nominal voltage. 42.5% sag (57.5% remaining voltage) corrected to 90% of nominal voltage.
Output RegulationRegulation tolerance is +/-5% (typical) (Note: SagFighter normally operates in monitoring mode until voltage reaches 90% of nominal voltage, at which time sag correction is initiated.)
Response TimeFull sag correction within 2ms regardless of load or load power factor.
Correction DurationSags corrected for a minimum of 100 seconds regardless of load or load power factor.
Regulation VariationNone - Regulation constant for 0 to 100% load and any load power factor.
Phase Shift CorrectionPhase shifts are corrected automatically during sag correction.
Harmonic DistortionNone added in monitoring mode.
Overload / Inrush Capability1,000% - 1 second, 500% - 5 seconds, 200% - 1 minute (while in bypass mode).
Load / Power Factor1 cycle typical regardless of load or load power factor.
Efficiency99% typical
Operating EnvironmentPerformance data specifications are based on the input (source) voltage meeting IEEE 519 standards.
Operating Frequency± 3% of nominal frequency (50Hz or 60Hz).

TechnologyMicroprocessor-controlled, inverter based series voltage injection.
TransformerCopper wound, dry-type series transformer (3W+G input and output).
Inverter OperationNon-continuous operation - activation only during sag correction.
CoolingNatural convection, w/ heatsink fans which operate only during sag correction [contaminant free, dry, clean air].
EnclosureFloor mounted NEMA-1 indoor enclosure is standard. ANSI 61 gray. [Custom enclosures (indoor or outdoor) also available - contact UST.]
Cabling / ConnectionsSee enclosure drawing for cable entry/exit options and input circuit breaker lug sizes.
Audible Sound LevelLess than 65dB @ 1 meter.
DisplayTouchscreen w/ event history recorder, operational data, and utilities.
ControlsAutomatic operation - no controls, programming, or user adjustments required.
MonitoringDry-contacts for remote indication of unit status are included as standard. Optional power metering with various communication protocols available - contact UST.

Environmental Requirements
Temperature - HumidityAmbient operating conditions: 32°F to 104°F (0 to 40°C) - Relative humidity 0-95% non- condensing
Operating Altitude0 to 3,300 ft. (1,000 M). Typical derating of 0.3% for every 100M over 1,000M