Voltage Sag
RMS voltage falls below the equipment tolerance window for a fraction of a second.
Wilson Technology · Industrial Power Continuity Solutions
Voltage Sag Shouldn’t Stop Your Factory.
Protect critical production lines from voltage sags and momentary interruptions with high-power, short-duration ride-through solutions.
Problem first. Protection architecture second. Technology only where it fits.
REAL INDUSTRIAL INSTALLATIONPower continuity integrated beside production equipment
The hidden outage
Does this happen in your plant?
The grid recovers quickly. The process does not. The first electrical trip can trigger hours of mechanical, thermal, material, and quality recovery.
VFD Trip
The drive DC link crosses an undervoltage threshold before the grid recovers.
Production Stop
One trip propagates through controls, auxiliaries, and the coordinated process.
Expensive Restart
Material loss, cleaning, re-threading, heating, stabilization, and quality checks extend recovery.
“The grid recovered in 0.5 seconds. Your factory took 3 hours to recover.”
Start with the event
What Is a Voltage Sag?
A voltage sag—also called a voltage dip—is a short reduction in RMS voltage. A drive or control system may cross its trip threshold before the supply returns to normal.
The event may be too short to be called a blackout—but long enough to trip a VFD.
Why does a VFD trip? →100%
55%
300 ms
Trace the failure path
What Trips First?
Protecting the wrong boundary wastes capital. Find the first failure that turns a brief electrical event into a production stop.
VFD-driven motor
The DC link falls below its undervoltage threshold and the inverter stops.
Support the DC bus →PLC & controls
Control power, contactors, or interlocks reset even when the motor can coast through.
Measure the first trip →Entire production line
Mixed loads must survive together or the coordinated process still collapses.
Protect the whole line →Four engineering paths
Select the protection boundary before the device.
Wilson Technology addresses industrial power continuity with a portfolio of assessment and ride-through architectures—not a flywheel-only catalog.
Protect selected drives
VFD DC-Bus Support
Support an accessible VFD DC link where the sag causes the undervoltage trip.
Explore architecture →Protect a critical feeder
Whole-Line Voltage Sag Protection
Restore voltage for mixed loads with a feeder-level Dynamic Voltage Restorer architecture.
Explore architecture →Bridge near-zero voltage
Momentary Interruption Protection
Supply real energy when residual grid voltage is no longer available to the load.
Explore architecture →Measure before selecting
Power Quality Assessment
Correlate waveforms, trip logs, and process sequence to define the lowest-cost boundary.
Explore architecture →Decision helper
Find Your Protection Architecture
Three questions narrow the starting point. A measured power-quality assessment and OEM review are still required before design.
Preliminary path
Answer the questions to narrow the boundary.
The helper does not replace measurement, OEM review, or a protection study.
Why flywheel—when the profile fits
High power. Short duration. Frequent cycling.
A flywheel can be a strong energy source for second-scale industrial ride-through. Fast response and an electromechanical storage medium are relevant where power matters more than long autonomy.
- Fast electrical response through the complete converter system
- High power-to-energy applications
- Frequent charge/discharge duty
- No electrochemical capacity-aging mechanism in the storage rotor
Not for every outage: long backup usually points to a battery UPS, BESS, generator, or hybrid system.
See the application boundaryProcess-specific protection
Where one trip becomes a line-wide loss.
Every industry page starts from the production process, the first equipment trip, and the minimum boundary needed for continuity.
TextileSpinning · DTY · Winding · DyeingEngineering page →Chemical & PetrochemicalPumps · Compressors · CoolingEngineering page →
PlasticsExtrusion · Cooling · DrivesV1 content framework placeholder
SteelCritical drives · AuxiliariesV1 content framework placeholder
Food & BeverageContinuous lines · RefrigerationV1 content framework placeholder
SemiconductorSensitive process systemsV1 content framework placeholder
Water & PumpingPumps · Controls · PressureV1 content framework placeholder
Real deployment · Customer proof
Verified ride-through records from a Fujian chemical-fiber plant.
The customer is disclosed only as Chemical Fiber Manufacturer, Fujian, China. Results remain separated by system to preserve the meaning of the source records.
Eight large texturing machines protected
Two systems. Two independently reported backend datasets.
WS300-66 · June 202613 / 13
Voltage-sag records / successful ride-through records
WS300-67 · July 20265 / 5
Voltage-sag records / successful ride-through records
Record cutoff: August 24, 2026. The counts are not presented as 18 independent plant-level voltage-sag events because the same grid disturbance may be recorded by both systems.
Read the verified case studyDowntime exposure
Calculate the loss the grid report does not show.
Use plant-approved inputs to estimate annual exposure. No customer result or savings claim is embedded in this tool.
Estimated annual voltage-sag loss
Currency follows the values you enter. This planning estimate is not a savings guarantee and does not include every operational consequence.
Get a Protection ROI AssessmentEvidence before claims
Engineering trust is built with traceable data.
This V1 does not invent customer names, certifications, test curves, efficiency, cycle life, MTBF, or product ratings. Each public claim is limited to the evidence Wilson Technology has verified for release.
Verified project evidence
One anonymized Fujian textile deployment now has verified installation timing, protected-machine counts, and separate backend ride-through records. Additional cases remain pending.
Review the verified case →Transparent calculations
Illustrative examples are clearly labeled and kept separate from customer results.
Standards and original sources
Technical pages link to IEC, IEEE, EEHC, DOE, and other primary references where relevant.
Engineering review
A half-second grid event deserves more than a three-hour restart.
Send the waveform if you have it. If not, send the load, voltage, trip sequence, and event history. We will help define the measurement and protection path.