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LV Transient Free Reactive Compensation Capacitor Banks

Main Lugs and Main Circuit Breaker Class 5870

Transient Free Reactive Compensation Systems

Square D Reactivar Transient Free Reactive Compensation (TFRC) anti-resonant (AT6000)Systems are ideally suited for use on electrical systems where connected equipment is extremely sensitive to variations in the supply voltage.

The problem: Capacitor systems featuring electromechanical contactors generate voltage transients on the electrical network when switching capacitor stages on/off, even when current limiting or tuning reactors are employed. Transients can impair the operation of sensitive equipment, including programmable logic controllers, variable speed drives, computers and UPS systems. In sensitive networks such as hospitals, data processing centers, airports and many manufacturing environments, any transient, however slight, may not be acceptable.

The solution: Transient free reactive compensation systems utilize electronic switching elements to energize capacitor stages. Switching occurs when the capacitor residual voltage matches the network voltage. The result is reactive compensation without generating voltage transients. The Anti-Resonant design allows for installation in harmonic rich environments which are typical with electronic loads.

A remote current transformer for each unit must be located on the bus/cable at the main service entrance terminal compartment—installed on the "A" phase. CTs are sold separately. To order, refer to CT Selection Guide on page 4-26.

It is imperative to ensure that no other capacitors (fixed or automatic) are connected to the same network as the AT6000 TFRC System

Additional capacitors on the network can lead to network resonance. Applying capacitors to a network containing harmonic producing loads warrants special consideration. It is highly recommended that you contact the Square D Power Quality Correction Group for application assistance. When calling for assistance, please have the following information available:

The Square D Power Quality Correction Group provides engineering assistance for the application of capacitors in harmonic rich environments. Specialists at Square D can assess the likelihood of application problems and arrange for more detailed study if required. Solutions can include computer modeling and system simulation. Our application engineers can make all the arrangements for system studies, custom engineering, installation and commissioning, as required by the application.

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Standard Features and Available Options

		AT6000
Silver flashed copper bus
Copper power and control wiring
Solid state capacitor switching modules
Heavy duty capacitor elements
Iron core tuning reactors
Forced air ventilation
Varlogic™ Controller
Split core CTs for incoming service		a
CT shorting blocks
Incoming section with main lugs
Incoming section with main circuit breaker		O
Top entry
Bottom entry		O
Type 1 enclosure (ASA 61 grey)
ASA 49 grey paint		O
Other voltages or frequencies		O

= Standard feature