{"id":1224,"date":"2020-07-06T19:50:19","date_gmt":"2020-07-06T19:50:19","guid":{"rendered":"https:\/\/www.zillionsbuyer.com\/blog\/?p=1224"},"modified":"2020-07-08T16:44:24","modified_gmt":"2020-07-08T16:44:24","slug":"what-is-sulphur-hexafluoride-circuit-breaker","status":"publish","type":"post","link":"https:\/\/www.zillionsbuyer.com\/blog\/what-is-sulphur-hexafluoride-circuit-breaker\/","title":{"rendered":"What is Sulphur Hexafluoride Circuit Breaker."},"content":{"rendered":"\n

In such breakers, sulphur hexafluoride (SF)<\/a><\/strong> gas is used as the are quenching medium. The SF, is a electronegative gas and has a strong tendency to absorb free electrons. <\/p>\n\n\n\n

The contacts of the breaker are opened in a high pressure flow of SF, gas and an are is struck between them<\/p>\n\n\n\n

The conducting free electrons in the arc  are rapidly captured by the gas to form relatively immobile negative ions.<\/p>\n\n\n\n

This loss of conduction electrons in the are quickly builds up enough insulation strength to extinguish the are. The SF6  circuit breakers have been found to be very effective for high power and high voltage service.<\/p>\n\n\n\n

\"Sulphur
Sulphur Hexafluoride Circuit Breaker.<\/figcaption><\/figure>\n\n\n\n

Properties\nof Sulphur-Hexafluoride Gas :<\/strong><\/p>\n\n\n\n

1.This gas is extremely stable and inert,\nand its density is five times that of air<\/p>\n\n\n\n

2.It is non-toxic and non-flammable.<\/p>\n\n\n\n

3.It is an ideal medium for circuit interruption, Its properties make it an ideal insulating and arc quenching medium.<\/p>\n\n\n\n

It has a thermal conductivity higher than that of air and\nhelps in better cooling of current canying parts.<\/p>\n\n\n\n

It has exceptionally low reactivity and does not attack\nmetals, plastics etc.<\/p>\n\n\n\n

Its dielectric strength at atmospheric pressure is 235 times\nthat of air and 30% less than oil. At three times the atmospheric pressure, it\nis more than that of oil.<\/p>\n\n\n\n

The gas at atmospheric pressure can interrupt currents of\nthe order of 100 times the value of those that can be interrupted in air with a\nplain breaker interrupter<\/p>\n\n\n\n

The low are time-constant (S I us) and its capacity to\nabsorb free  electrons due to its electromagnetic\ncharacter makes an excellent medium for arc quenching.<\/p>\n\n\n\n

Types of SF, circuit breakers :<\/p>\n\n\n\n

There are two types of SF, circuit breakers as below:<\/p>\n\n\n\n

1.Double pressure SF<\/p>\n\n\n\n

2.circuit breakers.<\/p>\n\n\n\n

Single – pressure Puffer-piston type SF, circuit breakers.<\/p>\n\n\n\n

Double-Pressure SF, Circuit Breakers:<\/p>\n\n\n\n

This is the early design of SF circuit breakers. Its\noperating principle is similar to that of air-blast circuit breakers. In this\ntype of a circuit breaker, the gas from a high-pressure compartment is released\nto the low pressure compartment to extinguish the arc.<\/p>\n\n\n\n

Because of its complicated design and construction, and its\nneed for various auxiliaries such as gas compressors, filters and control\ndevices, this type of circuit breakers have become obsolete,<\/p>\n\n\n\n

Single-pressure Puffer-Piston Type SF, Circuit Breaker:<\/p>\n\n\n\n

This type of circuit breaker are also sometimes called\nsingle pressure or impulse type SF circuit breakers. In this type breaker gas\nis compressed by a moving cylinder system and is released through a nozzle to\nquench the arc. This type is available in the voltage range 3.6 kv to 765 kV.<\/p>\n\n\n\n

puffer-type breaker in closed position. The moving cylinder\nand the moving contact are coupled together. When the contacts separate and the\nmoving cylinder moves, the trapped gas is compressed. The trapped gas is\nreleased through a nozzle and flows axially to quench the arc<\/p>\n","protected":false},"excerpt":{"rendered":"

In such breakers, sulphur hexafluoride (SF) gas is used as the are quenching medium. The SF, is a electronegative gas and has a strong tendency to absorb free electrons. The contacts of the breaker are opened in a high pressure flow of SF, gas and an are is struck between them The conducting free electrons […]<\/p>\n","protected":false},"author":1,"featured_media":1225,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44],"tags":[346],"class_list":["post-1224","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical-engineering","tag-circuit-breaker"],"_links":{"self":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts\/1224","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/comments?post=1224"}],"version-history":[{"count":2,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts\/1224\/revisions"}],"predecessor-version":[{"id":1250,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts\/1224\/revisions\/1250"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/media\/1225"}],"wp:attachment":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/media?parent=1224"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/categories?post=1224"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/tags?post=1224"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}