Air-blast Circuit Breakers Research Articles

Discussion on “The extinction of arcs in air-blast circuit breakers” before the Northern Ireland Centre, at Belfast, 10th February, 1948

Discussion on “The extinction of arcs in air-blast circuit breakers” before the Northern Ireland Centre, at Belfast, 10th February, 1948

Large Indoor Power Air-Blast Circuit Breakers

This paper deals with some of the electrical and mechanical engineering problems encountered in developing large power air-blast circuit breakers. The characteristics and adaptability of the axial blast and cross-blast types of circuit breakers, and the reason for utilizing part of the latter principle for the design of large, indoor, medium voltage power circuit breakers will be discussed. A brief review of circuit interrupting phenomena, resistor application, air flow conditions, as well as general dimensions and outline, will be given. Finally, analysis and test data will be submitted indicating the possibility of further development of the high power cross-axial blast circuit breaker. That is a circuit breaker in which the contacts part at right angles to the blast, while the arc is immediately attenuated in the axial direction of the blast so that interruption occurs as in an axial-blast circuit breaker.

Discussion on “The extinction of arcs in air-blast circuit-breakers” before the North Midland Centre, at Leeds, 11th March, 1947

Discussion on “The extinction of arcs in air-blast circuit-breakers” before the North Midland Centre, at Leeds, 11th March, 1947

Discussion on “The extinction of arcs in air-blast circuit-breakers” before the North-Eastern Centre, at Newcastle, 28th October, 1946

Discussion on “The extinction of arcs in air-blast circuit-breakers” before the North-Eastern Centre, at Newcastle, 28th October, 1946

Discussion on “The extinction of arcs in air-blast circuit-breakers” and “The performance of high-voltage oil circuit-breakers incorporating resistance switching” before the South Midland Centre, at Birmingham, 2nd December, 1946

Discussion on “The extinction of arcs in air-blast circuit-breakers” and “The performance of high-voltage oil circuit-breakers incorporating resistance switching” before the South Midland Centre, at Birmingham, 2nd December, 1946

The authors' reply to the discussions on “The extinction of arcs in air-blast circuit-breakers”

The authors' reply to the discussions on “The extinction of arcs in air-blast circuit-breakers”

The authors' reply to the discussion on “The extinction of arcs in air-blast circuit-breakers” and “The performance of high-voltage oil circuit-breakers incorporating resistance switching”

The authors' reply to the discussion on “The extinction of arcs in air-blast circuit-breakers” and “The performance of high-voltage oil circuit-breakers incorporating resistance switching”

Discussion on “The extinction of arcs in air-blast circuit-breakers” and “The performance of high-voltage oil circuit-breakers incorporating resistance switching” before the Institution, 7th November, 1946

Discussion on “The extinction of arcs in air-blast circuit-breakers” and “The performance of high-voltage oil circuit-breakers incorporating resistance switching” before the Institution, 7th November, 1946

The authors' replies to the discussion on “The extinction of arcs in air-blast circuit-breakers”and “The performance of high-voltage oil circuit-breakers incorporating resistance switching”

The authors' replies to the discussion on “The extinction of arcs in air-blast circuit-breakers”and “The performance of high-voltage oil circuit-breakers incorporating resistance switching”

The extinction of arcs in air-blast circuit-breakers

The paper deals with the development of air-blast circuit-breakers, and describes investigations of the many factors affecting their performance. Particular attention is paid to the aerodynamic design of the circuit breakers.The development of the air turbulator and its application in commercial 66-kV and 132-kV circuit breakers are described.The data tabulated are derived from an analysis of results of short-circuit tests extending over many years.

Discussion on “Air-blast circuit-breakers” before the West Wales Sub-Centre, at Swansea, 15th January, 1944

Discussion on “Air-blast circuit-breakers” before the West Wales Sub-Centre, at Swansea, 15th January, 1944

Discussion on “Air-blast circuit-breakers” before the Scottish Centre, at Edinburgh, 10th December, 1943

Discussion on “Air-blast circuit-breakers” before the Scottish Centre, at Edinburgh, 10th December, 1943

Discussion on “Air-blast circuit-breakers” before the Mersey and North Wales Centre, at Liverpool, 7th February, 1944

Discussion on “Air-blast circuit-breakers” before the Mersey and North Wales Centre, at Liverpool, 7th February, 1944

Discussion on “Air-blast circuit-breakers” before the East Midland Sub-Centre, at Derby, 26th November, 1943

Discussion on “Air-blast circuit-breakers” before the East Midland Sub-Centre, at Derby, 26th November, 1943

Discussion on “Air-blast circuit-breakers” before the North Midland Centre, at Leeds, 2nd November, 1943

Discussion on “Air-blast circuit-breakers” before the North Midland Centre, at Leeds, 2nd November, 1943

The author's reply to the discussions on “Air-blast circuit-breakers”

The author's reply to the discussions on “Air-blast circuit-breakers”

Discussion on “Air-blast circuit-breakers” before the Sheffield Sub-Centre, 15th March, 1944

Discussion on “Air-blast circuit-breakers” before the Sheffield Sub-Centre, 15th March, 1944

Dielectric recovery by an A-C arc in an air blast

SINCE the extinction of the arc drawn upon opening an a-c switch depends upon a rapid transition of the arc near a normal current zero from a conducting to an insulating state, much study has been given by switch designers to this transition, often referred to as dielectric recovery. However, the published experimental data with regard to the mechanism of this dielectric recovery still are meager and there is no generally agreed upon theory, even for the simpler cases. One simple case, of growing importance in this country, is that of the arc in an air-blast circuit breaker. Perhaps the simplest arrangement is found in the nozzle type of air-blast breaker variously described as radial blast or axial blast. Figure 1 is illustrative of such nozzles, somewhat reduced from practical forms.

Dielectric Recovery by an A-C Arc in an Air Blast

SINCE the extinction of the arc drawn upon opening an a-c switch depends upon a rapid transition of the arc near a normal current zero from a conducting to an insulating state, much study has been given by switch designers to this transition, often referred to as dielectric recovery. However, the published experimental data with regard to the mechanism of this dielectric recovery still are meager and there is no generally agreed upon theory, even for the simpler cases. One simple case, of growing importance in this country, is that of the arc in an air-blast circuit breaker. Perhaps the simplest arrangement is found in the nozzle type of air-blast breaker variously described as radial blast or axial blast. Figure 1 is illustrative of such nozzles, somewhat reduced from practical forms.

Discussion on “The influence of resistance switching on the design of high-voltage air-blast circuit-breakers” before the North-Eastern Centre, at Newcastle, 8th January, 1945

Discussion on “The influence of resistance switching on the design of high-voltage air-blast circuit-breakers” before the North-Eastern Centre, at Newcastle, 8th January, 1945