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| Polytechnic University of Puerto Rico--Undergraduates--Research (3) |
| Protective relays (3) |
| Electric power systems--Protection (1) |
| Impedance (Electricity) (1) |
| Polytechnic University of Puerto Rico--Undergraduates--Research (3) |
| Protective relays (3) |
| Electric power systems--Protection (1) |
| Impedance (Electricity) (1) |