TFI - Load Break Switching with Integral Ground and Fault Interrupting

G&W Electric model TFI padmount switches include load break and fault interrupting capability. The load break switch features visible break and integral ground position. The integral ground position eliminates the need to handle any high voltage connections to ground the cable connected to the load break ways. The fault interrupters provide electronically controlled, resettable over current protection in a totally sealed, dead front device. The switches are designed for use on 3-phase systems with voltages up to 27kV, 630A load break, and continuous current, and 12.5kA symmetrical fault interrupting ratings. They feature compact footprints due to their front access construction.

The switches are designed to IEEE C37.72, C37.74, and C37.60 for load break and fault interrupting capability. Padmount enclosures are designed and tested to IEEE C57.12.28 and C57.12.29.

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Features and Benefits

Construction - Available compact construction with front accessible switch operators and bushings. Vault construction is also available with top access to operators and bushings.

Visible Break - Load break ways are equipped with visible break to view the open, closed, and ground positions.

Fault Interrupting - Three phase fault interrupting up to 12.5kA with selectable industry curves including fuse emulation curves.

Ground Position - Integral ground position on load break ways to eliminate the need to handle high voltage components to ground the cable.

Voltage Sensing - Load break ways are available with integral voltage sensing for use with voltage indication panel to determine in-phase condition or for use with a relay with up to 1% accuracy.

Automation - Available for motor automation with portable or permanently mounted motor and controls. A variety of relays such as SEL, ABB, and GE are available with G&W Electric programming and cabinet construction. Cabinets can be ordered in a low voltage enclosure for padmount, pedestal or IP68 rated submersible for vault installed switchgear. Programming for automatic source transfer, protection, or LaZer custom solutions are available.

Configurations Chart for TFI

# of Ways	One-line Diagram (Horizontal)	Voltage Class (kV)	Catalog Number	Approximate
				Width* in. (mm)	Wt. w/SF6 lbs (kg)
6F		15	TFI32-376-12-6F	55.6 (1413)	1350 (612)
		25	TFI32-386-12-6F
9F		15	TFI42-376-12-9F	68 (1727)	2200 (1000)
		25	TFI42-386-12-9F
52F		15	TFI52-376-12-52F	76.1 (1934)	2800 (1273)
		25	TFI52-386-12-52F
62F		15	TFI62-376-12-62F	95.2 (2417)	3050 (1386)
		25	TFI62-386-12-62F	92 (2337)
Approximate enclosure height: 50" (1270mm), Approximate depth: 55" (1307)

Configurations Chart for VTFI

# of Ways	One-line Diagram (Horizontal)	Voltage Class (kV)	Catalog Number	Approximate
				Width* in. (mm)	Wt. w/SF6 lbs (kg)
6F		15	VTFI32-376-12-6F	62 (1575)	1350 (614)
		25	VTFI32-386-12-6F
9F		15	VTFI42-376-12-9F	74 (1880)	1500 (681)
		25	VTFI42-386-12-9F
52F		15	VTFI52-376-12-52F	86 (2184)	1750 (796)
		25	VTFI52-386-12-52F
62F		15	VTFI62-376-12-62F	98 (2489)	1950 (886)
		25	VTFI62-386-12-62F
Approximate height of tank minus frame: 29" (737mm), Approximate depth: 25.5" (648)

Ratings Chart for TFI and VTFI

Voltage Class	15kV	25kV
Maximum design voltage	15.5kV	27kV
Impulse level (BIL)	110kV	125kV
One minute withstand	35 AC kV	60 AC kV
One minute withstand, production test rating	34 AC kV	40 AC kV
15 minute withstand	53 DC kV	78 DC kV
Continuous and load break current	630 Amps	630 Amps
Momentary current	40kA asym	40kA asym
Fault close current, (3 times)	32kA asym	32kA asym
One second current	25kA asym	25kA asym
Fault interrupting ratings	12.5kA sym	12.5kA sym
Mechanical endurance, operations	2000	2000
IEEE C37.60 Fault Interrupting Duty Total number of fault interruptions: 116
Percent of Maximum Interrupting Rating	Approx. Interrupting Current, Amps	No. of Fault Interruptions
15 – 20%	2,000	44
45 – 55%	6,000	56
90 – 100%	12,500	16