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Technical Article: Mechanical Voltage Regulator Characteristics - Power Quality vs Line Drop

From Utility Systems Technologies, Inc.

The primary differences between power quality and utility applications are the range of input voltage regulation and voltage levels, but there are other, less obvious, differences including the terms used for these units.

For power quality applications the mechanical AVR goes by names such as: electromechanical voltage regulator or stabilizer, mechanical tap changing voltage regulator, tap switching voltage regulator, motorized variable transformer, motorized variac, magnetic induction voltage regulator or stabilizer, servo voltage regulator or stabilizer, motor-driven variable autotransformer and variable autotransformer.

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Three Phase Uninterruptible Power Supplies (UPS)
Three phase uninterruptible power supplies (UPS) operate in conjunction with existing electrical systems to provide power conditioning, back-up protection, and distribution for electronic equipment loads that use three-phase power. 
Uninterruptible Power Supplies (UPS)
Uninterruptible power supplies (UPS) are backup batteries that provide emergency power to electrical systems in case power becomes unavailable. They are connected between a power source (such as an electrical outlet) and the equipment to protect (such as a motor or computer).
Power or Line Conditioners
Power or line conditioners regulate, filter, and suppress noise in AC power for sensitive computer and other solid state equipment.
Single Phase Uninterruptible Power Supplies (UPS)
Single phase uninterruptible power supplies (UPS) sit between an AC outlet and an electronic device to provide power conditioning, back-up protection, and distribution for electronic equipment loads. They also prevent power disturbances from affecting the performance and life of the electronic device and vital data. 
Voltage Regulators
Voltage regulators are power converters that provide voltage control capabilities. They accept a voltage that varies over a given range and generate an output voltage that does not vary.
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Triad Magnetics - Step Up/Step Down Leaded Autotransformer
50-2000VA Single Primary and Secondary The Triad Autotransformers Series is designed as a single-winding transformer in which the primary coil is a fraction of the entire winding for voltage... (read more)
 
Topics of Interest

The typical electronic tap switching voltage regulator works very much like the mechanical tap switching regulator - except that it replaces mechanical servo drives and brushes with solid-state...

This type of voltage regulator has been in use for more than 50 years and has seen refinements throughout the years primarily with advances in control technology and servo drive systems. This type of...

The EVR is the modern standard for voltage regulation in most power quality applications. While an EVR will be about 25% higher in cost than a comparable mechanical voltage regulator, the difference...

An AVR takes in a range of voltage levels and automatically outputs a voltage with a much narrower range of voltage levels. For example, a typical automatic voltage regulator for power quality...

An AVR is at the heart of devices often called power conditioners or power stabilizers. The typical power conditioner is an automatic voltage regulator combined with one or more other power-quality...