Metal Enclosed Gas SF6 Insulated Switchgear
New metal-enclosed gas SF6 insulated switchgear type K8D9 and K9D7 for 72.5 kV to 300 kV is characterized with high-tech quality, contemporary technical solutions and high reliability as a result of many years of experience of production of metal-enclosed switchgears using contemporary methods and tools in the development of those switchgears. | ![]() Switchgear type K8D9 for 72.5 kV to 170 kV |
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During designing of switchgear, computer workstations and adequate software were used for electrical![]() and mechanical ![]() |
The basic characteristics of K8D9 and K9D7 switchgear are:
![]() Switchgear single line |
calculations and that approach resulted with excellent characteristics including high safety standards.![]() Switchgear type K9D7 up to 300 kV |
Technical Data
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Type |
K8D9
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K9D7
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Rated voltage | 72.5 kV | 123 kV | 145 kV | 170 kV | 245 kV | 300 kV | ||||
Rated frequency withstand voltage |
140 kV | 230 kV | 275 kV | 325 kV | 460 kV | 460 kV | ||||
Rated lightning impulse withstand voltage 1.2/50 µs |
325 kV | 550 kV | 650 kV | 750 kV | 1050 kV | 1050 kV | ||||
Rated short-time current |
40 kA -3s
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Peak withstand current |
100 kA
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Rated current busbars |
up to 3150 A
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Rated breaking current |
up to 40 kA
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Peak making current |
up to 100 kA
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Rated current |
up to 3150 A
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Switching cycle |
O-0.3s-CO-3 min.-CO
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Make time |
60 ms
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Break time (arcing time) |
54 (24) ms
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