eendraadschema

An eendraadschema, or one-line diagram, is a simplified schematic representation used in electrical engineering to show the functional arrangement and connections of components in a power system using a single conductor line. It focuses on how power flows between sources, transformers, switchgear, and loads rather than the physical layout of wires.

The diagram serves as a high-level overview of an installation, illustrating the main components and their interconnections. It typically includes sources such as the grid or a generator, main switchgear, transformers, protection devices, distribution boards, and major loads. The lines are labeled with voltage levels and may indicate rated currents, switching devices, and essential connectivity to aid planning, protection coordination, and fault analysis.

Symbols and standards are used to convey information clearly. Eendraadschema drawings employ standardized electrical symbols (often aligned with IEC, DIN, or national practices) to represent equipment such as circuit breakers, switches, busbars, and transformers. Although the exact notation can vary by region and project, the goal is consistent interpretation across engineers and technicians.

Applications of eendraadschema include electrical design, installation planning, commissioning, operation, and maintenance. It provides a concise overview that supports system analysis, protection coordination, and communication among stakeholders. It is not a detailed wiring diagram; it does not show wiring routes, conductor sizes, or all interconnections, and thus must be supplemented by more detailed schematics for construction and wiring tasks. The term literally means “one-line diagram” in Dutch.