This simulator links a one-line (single-line) schematic diagram directly to the physical switchyard equipment it represents — an HV source, disconnects, breakers, a power transformer, CTs/protection, and an LV bus with an optional backfeed source. Select symbols or physical components together, operate breakers and disconnects, and test isolation, backfeed and earthing interlocks.
• A real-time 3D scene of the linked one-line diagram and physical equipment — HV source, primary disconnect (DS1), primary breaker (CB1), power transformer, CTs/protection, secondary breaker (CB2), secondary disconnect (DS2), earthing switch and LV bus — with home view, focus-selected-part, toggleable enclosure cutaway, auto-rotate, expand and show/hide labels controls. • A Diagram & equipment workbench tab with a labeled parts index (HV source, disconnects DS1/DS2, primary/secondary breakers, power transformer, measurement & protection CTs, LV bus/backfeed) and click-to-inspect component callouts linking each schematic symbol to its physical equipment. • A Switching fixture panel: 'HV source available' and 'LV backfeed source available' checkboxes, plus five toggle actions — toggle primary breaker (CB1), toggle primary disconnect (DS1), toggle secondary breaker (CB2), toggle secondary disconnect (DS2), and toggle earthing switch — with interlocks that block disconnect operation under a closed breaker. • Playback controls: pause/resume, single step, larger step, and four playback speeds (0.1×, 1×, 10×, 60× laboratory speed). • A Topology & states analysis tab with two live charts, the underlying connectivity equations (HV path, LV bus energization, transformer energization, earthing-close permission logic) and snapshot readouts for primary system voltage, load bus voltage, illustrative forward load current, both-side isolation status, backfeed-enabled status and earthing-closed status. • An Experiments tab with four guided fixtures (read the normal path, open primary breaker, find a backfeed, blocked disconnect operation) and a Model verification bench that runs independent deterministic checks against a fresh model without disturbing your live experiment, plus a timestamped event log and a copyable trial report. • A Learn & assess tab with guided lessons, a knowledge-check quiz with reset, and a written model-scope statement with an OSHA reference link.
A single-line (one-line) diagram represents a three-phase circuit with a single line, suppressing the repeated phase conductors while preserving equipment order and connectivity. In this simulator, each schematic symbol — source, disconnect, breaker, transformer, CT, load bus — is directly linked to its corresponding physical component, so selecting either one highlights and explains both together.
The model also distinguishes power paths from control paths: CT signals and trip commands are low-energy measurement and control connections, not the load-current route itself. Opening one breaker interrupts the load current path through that breaker, but source-side equipment upstream of the breaker remains energized.
The simulator lets you enable an 'LV backfeed source available' fixture, then open the primary breaker — the load bus remains energized because the secondary (LV) source can still backfeed it through the transformer, per the model's LV bus = backfeed OR (HV path AND CB2 AND DS2) connectivity logic. This demonstrates that an open breaker alone does not guarantee a bus is dead: backfeed sources, grounding and voltage verification are separate considerations from breaker position.
The earthing switch can only be closed when both disconnects (DS1, DS2) and both breakers (CB1, CB2) are open — attempting to operate a disconnect under a closed breaker is rejected, with the event log explaining the interlock. This is a logical-connectivity teaching model, not an authorized switching procedure: it does not simulate lockout/tagout, induced voltages, trapped charge or site-specific operating rules, and the displayed load current is an illustrative 10 MVA / 13.8 kV fixture.
A one-line diagram represents a three-phase circuit with a single schematic line per equipment item, suppressing repeated phase conductors while preserving equipment order and electrical connectivity. This simulator directly links each schematic symbol — source, disconnect, breaker, transformer, CT, load bus — to its physical equipment counterpart, so you can select either the symbol or the physical component to see both explained together.
No. The simulator lets you enable an LV backfeed source and open the primary breaker to show the load bus remaining energized through the transformer from the secondary side. Visible isolation, backfeed sources, grounding and verified absence of voltage are all separate considerations from simple breaker position.
The model enforces an earthing-close permission interlock requiring both disconnects (DS1, DS2) and both breakers (CB1, CB2) to be open before the earthing switch can close. It also rejects disconnect operation while the corresponding breaker is closed, explaining the interlock in the event log.
No. It is a logical-connectivity and interlock teaching model, not an authorized switching order. It does not simulate lockout/tagout procedures, induced voltages, trapped charge or site-specific operating rules, and the displayed 418 A load current is an illustrative 10 MVA / 13.8 kV fixture rather than measured data.