| Term | Definition |
|---|
| Rooftop mounting options | integrated, standoff, direct |
| Line commutated inverter | Grid signal used to synchronise inverter with grid |
| Self commutated inverter | internal electronics synchronise inverter with grid |
| Significant contribution to household demand | 2-4 kWp |
| Distribution feeder V support | PV supply to relieve thermal overload on transformers & conductors |
| Parallel connections improve tolerance to | open-circuits |
| Optimum system tolerance is achieved by | increasing no. of parallel strings & no. bypass diodes |
| Arc voltage | 70V |
| Arcs prevented by | introducing redundant, parallel connections |
| Frame grounding | prevents frames reaching unsafe voltages |
| Circuit grounding | Prevents cell circuit floating above ground & stressing insulation |
| Ground fault-breaker | Senses a ground fault & either shorts array or opens array-ground circuit |
| Islanding | System delivers power to grid even if grid is shut down |
| PV/grid interface units protect grid & system from | islanding, lightning surges, short circuits & grounding |
| Energy credit | Value of energy. Ability to meet peak demand of great value |
| Capacity credit | statistical probablilty a generator will increase grid's capability to meet peak demand |
| Distributed benefit | Decentralised PV plant can be built closer to demand, reducing transmission & transformer losses |
| Thermal overload | Transmission line carries full load, excess energy lost as heat |
Combine with other sets
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