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What are they?

What is the definition of a Power Sag?

Voltage sags – or dips which are the same thing – are brief reductions in voltage, typically lasting from a cycle to a second or so, or tens of milliseconds to hundreds of milliseconds.

National Power Outage Map: PowerOutage.US

Voltage Sags

Voltage sags are caused by abrupt increases in loads such as short circuits or faults, motors starting, or electric heaters turning on, or they are caused by abrupt increases in source impedance, typically caused by a loose connection.

Voltage sags can arrive from the utility; however, in most cases, the majority of sags are generated inside a building. For example, in residential wiring, the most common cause of voltage sags is the starting current drawn by refrigerator and air conditioning motors.

Sags do not generally disturb incandescent or fluorescent lighting. motors, or heaters. However, some electronic equipment lacks sufficient internal energy storage and, therefore, cannot ride through sags in the supply voltage. Equipment may be able to ride through very brief, deep sags, or it may be able to ride through longer but shallower sags.

voltage sags

Voltage Swells

Voltage swells are almost always caused by an abrupt reduction in load on a circuit with a poor or damaged voltage regulator, although they can also be caused by a damaged or loose neutral connection. Voltage swells are brief increases in voltage over the same time range. Longer periods of low or high voltage are referred to as “undervoltage” or “overvoltage.”

Have an ICP site survey done to survey your facility and install a power metering device.

When you install equipment that will correct power and hold voltage within your facility, you will be providing your facility with protection against all outside influences of power. Halting wear and tear on other equipment in the facility by having stable voltage and power factor is the goal. The long term positives are lowered operations and maintenance costs by limiting voltage and amperage anomalies inside the facility. It is common to vet these issues by installing a monitoring device at the service entrance of the facility utility power. This is a low-cost method to really understand these issues and to make a proper diagnosis.

We are available to review electrical one-lines, Power Reports, Demand Usage, and any other data on your facility power.

Call your ICP Technical Representative today to discuss options to increase efficiency in your facility and correct our facility power issues!

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Sizing Solutions – Cost / Benefit Analysis – Executing Solution

Contact an ICP consultant today to discuss power correction options for your facility. Leasing options available that match cost of owning one to one with cost/efficiency savings.
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