Recent US Bureau of Mines sponsored research aimed at virtually eliminating electrocutions on de utilization cireuits has resulted in an effective dc cireuit protection device, called a sensitive ground fault relay (GFR). This relay can detect and act to interrupt small deadly ground currents that can trigger ventricular fibrillation in humans while ignoring spurious power System Signals. Initially relay Performance criteria were established to ensure reliability for mine duty as well as effectiveness for shock prevention. Mineworthy prototypes, consisting of a saturable-transformer current sensor and an electronic relay, were construeted. They complied with the Performance Standards in laboratory tests.
All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Industrial and Manufacturing Engineering
- Electrical and Electronic Engineering