Since 1970 at least 12 men have died from underground coal mine fires which were started due to undetected high-resistanice dc faults on trolley systems. A technique is proposed which utilizes Newton's method to solve the nonlinear equations which determine such fault currents. The formulation is unique in that it is the first known method to account for de fault current contribuitions from both rectifiers and dc motors. Results from the technique can be used to size and coordinate devices used for system protection. The problems of accurately predicting such fault currents is discussed. A sample problem is included as an example.
ASJC Scopus subject areas
- Control and Systems Engineering
- Industrial and Manufacturing Engineering
- Electrical and Electronic Engineering