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Vacuum arc-extinguishing chambers
Vacuum arc-extinguishing chambers The vacuum arc-extinguishing chambers (VAC) are the core elements of vacuum switchgear and vacuum contactors. The VAC-based vacuum switchgear/contactors are environment-friendly and very reliable equipment, where the extinguishment of electric arc is made on the account of the contactors’ moving within the high ambient vacuum (under 10-5÷10-6 mm of mercury column). The vacuum-based arc-extinguishment enables the development of switching/commutation equipment intended for coal-mining, chemical, and petroleum industries. Such equipment can also find application in the public utilities and related areas. Nowadays, Generator State-run Company serially produces two types of the high-voltage VAC. Simultaneously, the company is currently preparing to start manufacture of two new types of the high-voltage VAC as well as four new types of the low-voltage VAC. All of these devices have been developed by Generator on the basis of national patents and do not yield to the respective foreign-made similar products. Technical Properties Main technical properties | Currently made on serial basis | Scheduled for serial manufacture | KDVH 10-20/1600 | KDVM 10-20/1600 | KDVP 10-25/2500 | KDVP 10-20/1600 | KDV 10-20/1600 | KDV 10-12,5/1000 | KDV 1,14-400 | KDV 1,14-250 | KDV 1,14-160 | Nominal voltage of industrial frequency, KV | 10 | 10 | 10 | 10 | 10 | 10 | 1.14 | 1.14 | 1.14 | One-minute-long testing voltage, KV | 42 | 42 | 42 | 42 | 42 | 42 | 10 | 10 | 10 | Nominal current, A | 1600 | 1600 | 2500 | 1600 | 1600 | 1000 | 400 | 250 | 160 | Nominal breaking current, KA | 20 | 20 | 25 | 20 | 20 | 12,5 | 5,1 | 3,2 | 3,0 | Endurance under short circuit through current: - electrodynamic (maximum amplitude current), KA ; - thermal (efficient current), KA | 51 20 | 51 20 | 64 25 | 51 20 | 51 20 | 32 10 | 6.0 3.2 | 5.6 3.0 | 4.2 2.4 | Switching endurance & switching cycles: - under nominal current; - under nominal breaking current | 75 thsd. 100 | 75 thsd. 100 | 30 thsd. 50 | 75 thsd. 100 | 75 thsd. 100 | 75 thsd. 120 | 2 mln. 0.15-106 | 2 mln. 0.25-106 | 2 mln. 0.5-106 | Transient contact resistance, not exceeding, micro Ohm | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | Devices' own contact thrust, N | 120 | 120 | 120 | 120 | 120 | 120 | 75 | 45 | 35 | Supplementary contact thrust, N | 1200 | 1200 | 2000 | 1200 | 1200 | 800 | 20 | 20 | 15 | Moving contact travel, mm | 8 | 8 | 8 | 8 | 8 | 6 | 2 | 2 | 2 | Dimensions, mm: - height - diameter | 240 106 | 240 106 | 210 95 | 180 95 | 180 96 | 250 85 | 125 66 | 105 56 | 95 46 | Weight, not exceeding, kg | 4.0 | 3.8 | 2.2 | 2.0 | 2.5 | 2.5 | 0.7 | 0.5 | 0.3 |
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