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Circuit Breaker Control

IP.com Disclosure Number: IPCOM000096543D
Original Publication Date: 1963-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Baycura, OM: AUTHOR

Abstract

In a cross-field controlled circuit breaker, load 12 is connected to a DC source 14 through the contacts of circuit breaker 16 and control winding 28 on magnet 26. Capacitor 15, in series with primary winding 35 of transformer 32, is connected in parallel to load 12. Secondary winding 33 of 32 is connected to control winding 30 on magnet 26. In gap 27 in 26 is located annular core 25. Around this is wound a winding 24. Such is in a series circuit with adjustable resistor 22, AC source 20 and operating winding 18 for breaker 16.

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Circuit Breaker Control

In a cross-field controlled circuit breaker, load 12 is connected to a DC source 14 through the contacts of circuit breaker 16 and control winding 28 on magnet 26. Capacitor 15, in series with primary winding 35 of transformer 32, is connected in parallel to load 12. Secondary winding 33 of 32 is connected to control winding 30 on magnet 26. In gap 27 in 26 is located annular core 25. Around this is wound a winding 24. Such is in a series circuit with adjustable resistor 22, AC source 20 and operating winding 18 for breaker 16.

When breaker 16 is initially closed, Capacitor 15 begins to charge. Charging current in 35 passes through 28 to cause a compensating current to flow in 30 through 33. This current flow in 30 opposes the effect of current flow in 28. No cross-field effect is produced in 25 and the inductance of 24 remains high enough to prevent opening of 16.

If a short-circuit occurs in the load, increased current flows in 28. Capacitor 15 tends to discharge through the short-circuit. Current in 35 causes current flow in 30 which is additive in effect to that in 28. The relatively strong flux in gap 27 passes through core 25 and reduces the inductance of 24. This allows sufficient current to flow in 18 to open breaker 16.

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