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PFC Capacitor Banks

 

Class 5870

LV Transient Free Reactive Compensation Capacitor Banks

 

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.

Application Notes

1.	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 34.

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

3.

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:

.

Table 4.47:

Standard Features and Available Options

		AT6000
Silver flashed copper bus		X
Copper power and control wiring		X
Solid state capacitor switching modules		X
Heavy duty capacitor elements		X
Iron core tuning reactors		X
Forced air ventilation		X
Varlogic™ N12 Controller		X
Varlogic NRC12 Controller		O
Split core CTs for incoming service		a
CT shorting blocks		X
Incoming section with main lugs		X
Incoming section with main circuit breaker		O
Top entry		X
Bottom entry		O
Type 1 enclosure (ASA 61 grey)		X
Type 3R (ASA 49 grey)		O
Other voltages or frequencies		O
X= Standard feature O= Available option–contact your nearest Square D/Schneider Electric sales office for pricing a Required, but must be ordered separately.

●	12 months of utility billing information

●	A single line diagram of the network showing the nature of loads (e.g. 150 hp FVNR starters; 200 hp VFD; etc.)

●	Transformer(s) kVA rating and percent impedance (%Z)

●	Primary & secondary voltages

●	Location of utility metering

●	Size, type and location of any existing capacitors

Application Assistance

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.

 

Table 4.48:

AT6000 Seriesf 480 Voltb, 3 Phase, 60 Hz Main Lugs or Main Circuit Breaker—CTs sold separately. See page 4-34 g

KVAR Ratingb @480 V	Steps (Qty x kVAR)	Main Lugs NEMA Type 1c			Main Circuit Breaker NEMA Type 1c			Standard Lugs Providedb (Qty x kcmil)	Recommended Minimum Size Protection Ratingd @480 V		Recommended Minimum Cable Ampacityd 135% Rated Current
		Catalog No.e	$ Price	Encl.	Catalog No.e	$ Price	Encl.		Fuse	Breaker/Trip
300	2x150	AT030046AABF8N	58058.00	8	BT030046AABF8N	66183.00	8	4x500	600	800/600	535
375	1x75, 2x150	AT037546CAAF8N	72409.00	8	BT037546CAAF8N	79892.00	8	4x500	800	800/800	668
450	3x150	AT045046AABF8N	81744.00	8	BT045046AABF8N	88022.00	8	4x500	900	1200/900	802
600	4x150	AT060046AABFAN	101601.00	9	BT060046AABFAN	116639.00	9	6x500	1200	1200/1200	1069
750	5x150	AT075046AABFAN	122441.00	9	BT075046AABFAN	134152.00	9	6x500	1500	1600/1500	1337
900	6x150	AT090046AABFAN	141252.00	9	BT090046AABFAN	158676.00	9	6x500	1800	2000/1800	1604
b For larger sizes or 240 V systems contact your nearest Square D/Schneider Electric sales office. See page 4-33 for Medium Voltage Systems. c Only Type 1 Indoor enclosure available. For dimensions, see page 4-34. d Consult local Electrical Codes for proper sizing of molded case circuit breakers, disconnect switches and cables. e Top entry is standard. For alternate entry, consult your nearest Square D/Schneider Electric sales office. f Order only. Typical delivery is 8-10 weeks. Contact local sales office for committed delivery. g One remote current transformer must be located on the bus/cable at the main service entrance terminal compartment, “A” phase. CTs sold separately. See page 4-34.

 

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