Fault Protection and Switching/Sectionalizing
RVAC
The Kyle® Type RVAC pad-mounted vacuum switchgear is designed for applications where frequent 600-amp main line switching plus fuse protection are required. RVAC pad-mounted switchgear offers the superior performance of vacuum loadbreak for switching underground distribution systems. It incorporates an interrupter mechanism designed specifically for repetitive switching duty. Vacuum interrupters offer the further advantages of long life in repetitive service, low maintenance, quiet operation, and high switching ratings.
The deadfront, non-ventilated, tamper-resistant construction of RVAC switchgear makes it suitable for operation in areas subject to excessive moisture, occasional flooding and blowing snow. The rubber gasket in the bolted cover provides additional sealing. RVAC consists of a sealed insulation tank which houses energized components, and separate main and tap compartments. The main compartment, located at the front of the tank, houses the source bushings and source switches, and has a minimum depth of 22 inches when provided with 600A bushings. At the rear of the tank, the tap compartment contains tap bushings, tap switches if specified, and fuses. It has a minimum depth of 16 inches when provided with 200A bushing wells.
Bushings are mounted in-line and located a minimum of 24 inches above the pad:
- 600-amp bushings furnished on RVAC pad-mounted switchgear are RTE deadbreak aluminum type, and conform to ANSI/IEEE standard 386.
- 200-amp interfaces are either RTE 200-amp bushing wells or RTE 200-amp one-piece 35kV bushings and conform to ANSI/IEEE standard 386.
Fluid or SF6 insulation provides a compact, low-profile design that is unobtrusive in commercial and industrial/office park applications. For fault protection with RVAC oil-insulated units, Cooper Power Systems offers a complete line of fuses available for pad-mounted switchgear. A wide range of current-limiting fusing options provides simple, easy coordination with system requirements.
RVAC vacuum pad-mounted switchgear is available in single- and three-phase units in ratings of 15, 25 and 35 kV:
| Ratings of RVAC Pad-mounted Switchgear |
| Nomial Voltage |
15 kV |
25 kV |
35 kV |
| Maximum Design Voltage (kV) |
15.5 |
27 |
38 |
| BIL (kV) |
95 |
125 |
150 |
| 1 Minute Withstand
Switch and Terminators (kV) |
34 |
40 |
50 |
| Continuous Current (Amps) |
600 |
600 |
600 |
| Load Switching (Amps) |
600 |
600 |
600 |
| Momentary Current 10 Cycles
(asym.) (Amps) |
20,000 |
20,000 |
20,000 |
|
1 Sec. (sym.) (Amps) |
12,000 |
12,000 |
12,000 |
| Close and Latch (asym.) - (3 operations) (Amps) |
20,000 |
20,000 |
20,000 |
| Interrupting Rating (kA*)
|
50 |
20 - 50 |
12.2 - 50 |
| *Interrupting rating for fused units depends on the selected fuses and the application voltage. |
All internal energized parts are insulated in fluid or SF6 gas, which contributes to the compact design of RVAC switchgear. For fluid-insulated units only, an automatic pressure-relief valve, operated by hotstick, is mounted above the liquid level on the switchgear.
Vacuum interruption offers a number of advantages in service, reliability and maintenance. The RVAC interrupter offers many times the number of switching operations in a lifetime compared to an air or oil interrupter. Contacts are hermetically sealed, eliminating any source of contamination. Vacuum interruption is fast - on the first current zero. Arcing is minimized. The RVAC interrupter is restrike-free.
The advantages of vacuum interruption extend to the interrupter mechanism. The short contact stroke minimizes the mass being moved and therefore mechanical shock. This in turn permits a substantial reduction in the size and total weight of the interrupter assembly. As a result, the interrupter mechanism for RVAC switchgear is simple, dependable and easy to operate. The operating lever requires only an easy push or pull action to close or open, and the switch can be padlocked in either position.
Painted with the most advanced coating system in the industry, RVAC switchgear retains a like-new protective finish years after others have blistered, cracked, chalked, or rusted.
RVAC is available in 2, 3, 4, 5, and 6-way standard configurations at 15, 25, and 35 kV. For availability of other configurations, contact your Cooper Power Systems representative.
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