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Eaton's Cooper Power series VACpac underground distribution vacuum switchgear is used to switch load, loop, capacitor and cable charging, as well as magnetising currents. Ideal applications include underground vaults, submersible, high-rise building, mining operations, campus and computer-controlled switching installations.
| Safety |
Operation is in a self-contained fireproof medium—with elbow terminations—with remote switching options |
| Compact |
Accomplished with a vacuum switching medium and an SF6 self-contained operation medium—largest unit fits through manhole openings—volume is approximately 1/5 that of equivalent oil switches |
| Maintenance free |
All switches, mechanism and bus work sealed within a corrosion-resistant 300 series stainless steel enclosure in an inert SF6 environment The vacuum interrupter housed in a sealed environment is essentially maintenance free throughout its lifetime |
| Ideal switching |
Vacuum arc interrupters are fast, efficient, quiet and not susceptible to the danger of contamination from load switching arcs, lightning or other surges When closed an ideal conductor, when open an ideal insulator Contact design prevents current chopping |
| Minimize liabilities |
Nonflammable insulating SF6 gas will not support combustion in the event of a short circuit inside the switch This will guard against possible costly liabilities relative to adjacent electrical apparatus, private property, high-rise buildings, schools, extended outages, etc. |
| Lightweight |
Estimated at approximately 100 lbs. per three-phase way or 1/7 that of an equivalent oil switch |
| Flexibility |
Not position-sensitive—may be mounted on floors, from walls or ceiling with complete elbow operating flexibility |
| Installation time |
Less than half when compared with oil switches |
| Circuitry |
Accommodates four three-phase or single-phase circuits with many switching combinations in one compact enclosure |
| Switching operations |
Approximately 25 times greater than that obtained with liquid switching mediums |
| Controls |
Include short stroke manual, remote control manual, electric automatic, spring loaded automatic for new or retrofit operations |
| Automation |
Control intelligence includes all conventional PTs, CTs and relays |
| Pad-mounted |
Low profile enclosures include VACpac switchgear with tap fusing and/or relay protection schemes incorporating elbow switching concepts |
| Heavy gas |
SF6 is heavier than air and will not “leak upward" |
| Operating mechanism |
Low energy requirements to switch vacuum interrupters permit long operating life Provides positive quick make-break switching |
| Fault energy withstand |
A vacuum switch failure can withstand an energy let-thru in SF6 gas 200 times greater than that of a liquid insulating medium |
| Reduced voltage |
Higher voltage rated VACpac switchgear may be operated at reduced voltages in anticipation of a future voltage conversion |
| Application |
High voltage switching manual and/or remote for subsurface, surface and vertical distribution circuits |
| Turnkey package systems |
Switch complete with controls, accessories and terminations (Cables not included) |
| Test notes |
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| a. This testing exceeds the requirements of ANSI C37.71 for submersible switchgear |
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| b. The number of switching functions for various circuit conditions were in excess of 360 operations |
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| c. The 6 fault close operations exceed by a factor of 2 maximum requirements for submersible switchgear |
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| d. When the testing was discontinued, the test switch was yet electrically and mechanically sound | ||
| Interrupting Tests |
Amperes |
Operations |
| a. Load switching — Close and Open |
600 | 20 |
| 300 | 30 | |
| 50 | 10 | |
| b. Magnetizing current — Open only |
21 | 10 |
| 7 | 10 | |
| c. Cable Charging Current — Close and Open |
25 | 20 |
| Mechanical operation test |
||
| a. Close and Open |
-0- | 50 |
| b. High potential @ 30 kV — Open |
— |
OK |
| Momentary current test |
||
| a. Calibration — Closed |
12,000 | 3 |
| b. 10-cycle duration — Closed |
20,000 | 9 |
| Making current test (Fault Close) |
||
| a. Reduced voltage — Close |
10,000 | 2 |
| b. Full voltage — Close |
20,000 | 3 |
| Withstand test |
||
| a. High potential @ 42 kV — Open |
— |
OK |
| Thermal runaway test |
||
| a. Continuous loading |
600 | OK |
| Thermal stability — Closed |
||
| Mechanical operations test |
||
| a. Close and Open |
-0- | 200 |
| b. Continuity — Closed |
-0- | OK |
| c. High potential @ 38 kV — Open |
-0- | OK |
| Making current test (Fault Close) |
||
| a. Reduced voltage — Close |
10,000 | 3 |
| b. Full voltage — Close |
20,000 | 3 |
Visit this page for information on earlier models.
