Development of current limiting conductor
Abstract
The theory of the current limiting conductor (CLC) is developed and confirmed by experiments. In principle the CLC is a linearly-extended solenoid whose inductance increases as the air gap between the armature and the core is reduced by magnetic forces resulting from the short circuit current. Design formulae for the CLC concept are developed. The nonlinear interaction of the electric circuit, magnetic circuit, and the mechanical system is analyzed. Both steady state and transient solutions are obtained. A peculiar beat pattern of the limited current was observed and mitigated by increasing the losses of the CLC. Analysis suggested switching a resistor into the circuit. The term CLC with resistor was coined and commutation of current to the resistor explored. A cost analysis indicates that inclusion of the resistor may reduce the cost of the CLC by 90%. The trade-off is complexity. Fractional CLC devices with and without resistor were designed.
- Publication:
-
Final Report Phoenix Electric Corp
- Pub Date:
- February 1977
- Bibcode:
- 1977phec.rept.....A
- Keywords:
-
- Current Regulators;
- Electric Conductors;
- Electromechanical Devices;
- Production Engineering;
- Resistors;
- Cost Reduction;
- Electrical Properties;
- Limiter Circuits;
- Linear Circuits;
- Magnetic Circuits;
- Solenoids;
- Electronics and Electrical Engineering