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SF6 circuit breakers are designed to handle voltages ranging from 33KV to 800KV. They come in three main types to cater to a variety of voltage requirements. (The passage further discusses the testing and repair services for these circuit breakers.)
SF6 electrical circuit breaker is a device where a current operates with SF6 or Sulphur Hexafluoride being carried on its contacts. Testing services for SF6 breakers ensure that these devices break off the power when there's an excessive electricity supply that exceeds the allowed voltage to prevent circuit overload.
1640 C => the rated current of the breaker. The sf6 breaker withstands up to 1640 Amps in steady operation. Which means you can load the breaker up to 1600 Amps C => Current The Rated voltage of the breaker. The maximum current that we can load the breaker. Here we can allow up to 1600 Amps current through male and female contact.
They come in various voltage levels like – 66 KV SF6 Gas Circuit Breaker, 72.5 KV SF6 Circuit Breaker, 110 KV SF6 Circuit Breaker, 132 KV SF6 Circuit Breaker, 145 KV SF6 Circuit Breaker, 220 KV SF6 Circuit Breaker, 245 KV SF6 Circuit Breaker, 400 KV SF6 Gas Circuit Breaker.
The first high-voltage SF 6 circuit breaker with a high short-circuit current capability was produced by Westinghouse in 1959. This circuit breaker in a grounded tank (called a dead tank), could interrupt 41.8 kA under 138 kV (10,000 MV·A) and 37.6 kA under 230 kV (15,000 MV·A).
The achievement around 1983 of the first single-break 245 kV and the corresponding 420 kV to 550 kV and 800 kV, with respectively 2, 3, and 4 chambers per pole, led to the dominance of SF 6 circuit breakers in the complete range of high voltages. Several characteristics of SF 6 circuit breakers can explain their success:
The first high-voltage SF 6 circuit breaker built in 1956 by Westinghouse, could interrupt 5 kA under 115 kV, but it had six interrupting chambers in series per pole.
SF 6 gas is electronegative and has a strong tendency to absorb free electrons. The contacts of the breaker are opened in a high-pressure flow of sulfur hexafluoride gas, and an arc is struck between them. The gas captures the conducting free electrons in the arc to form relatively immobile negative ions.
The first high-voltage SF 6 circuit breaker built in 1956 by Westinghouse, could interrupt 5 kA under 115 kV, but it had six interrupting chambers in series per pole.
The first high-voltage SF 6 circuit breaker with a high short-circuit current capability was produced by Westinghouse in 1959. This circuit breaker in a grounded tank (called a dead tank), could interrupt 41.8 kA under 138 kV (10,000 MV·A) and 37.6 kA under 230 kV (15,000 MV·A).
The achievement around 1983 of the first single-break 245 kV and the corresponding 420 kV to 550 kV and 800 kV, with respectively 2, 3, and 4 chambers per pole, led to the dominance of SF 6 circuit breakers in the complete range of high voltages. Several characteristics of SF 6 circuit breakers can explain their success:
The self-blast technique described above is also widely used in SF 6 generator circuit breakers, in which the contact system is driven by a low-energy, spring-operated mechanism. An example of such a device is shown in the figure below; this circuit breaker is rated for 17.5 kV and 63 kA.
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