AccuSine AHF - Hybrid VAR Compensator (HVC)

AccuSine® PCS AHF

The Hybrid VAR Compensator (HVC) is ideally suited for industrial facilities with power quality or production problems caused by rapidly changing load demands typical of highly cyclical loads such as welders, mining conveyors and heavy stamping machines.

The problem:

Traditional capacitor systems have a minimum response time of five to ten seconds for load fluctuations. As a result of this limitation, uncompensated faster loads can produce voltage instability, voltage flicker, increased losses and poor power factor which reduces the electric supply capacity. Problems can often be seen inside the facility, on the utility feeder to the facility or in neighboring facilities. Problems can include:

●	Poor weld quality or reduced weld line productivity (due to restrikes or interlock weld controls)

●	Failure to start motor loads (due to voltage sag on startup)

●	Undervoltage tripping of sensitive loads (Robots, PLCs, VFDs)

●	Lighting flicker and/or HID lighting shutdown

●	Overloaded distribution equipment (cyclical current pulses may exceed the rated current of the distribution equipment)

●	Poor power factor and associated utility demand charges

●	High harmonic levels

Ultra-Fast Reactive Power Solution:

●	The Hybrid VAR Compensator is ideally suited for power factor correction and voltage sag support in many applications where conventional systems are not suitable:

●	One cycle or less for full response

●	Infinite VAR resolution

●	Compensates for large inductive inrush currents

●	Transient free compensation

●	Improves voltage regulation

●	Reduces flicker

HVC systems can alleviate any of the problems created by cyclical loads that require large amounts or reactive power for short duration.

Unique, cost-effective construction:

HVC systems couple a detuned capacitor system (fixed, contactor or power electronic switched) with the AccuSine® Electronic VAR Control (EVC) unit. The Accusine EVC is able to inject leading or lagging VARs to provide variable compensation over the operating rating. For example, coupling a 500 kVAR fixed detuned bank with a 300 A Accusine EVC yields an HVC that can provide reactive compensation between 250 kVAR and 750 kVAR.

Custom Designed Solution:

Sizing of the HVC will often require a site visit by Square D Power Quality Correction Group technicians to take real-time measurements of the network. Please contact the PQc group at (905)678-6699 or email pqc@squared.com

Round Split-Core Selection:

Three CT’s required for networks with line-neutral loads. Two remote current transformers required for three phase loads. For installations requiring parallel connection of multiple AccuSine for increased correction capacity, special considerations may be required. Contact the Square D Power Quality Correction Group for details.