LT Auto Change - Over Panels
Key Functions of an Auto Changeover Panel
| Function | Description |
|---|---|
| Automatic Power Transfer | Instantly detects main power failure and switches to generator power. |
| Auto Reversion | Automatically switches back to grid power when normal supply is restored. |
| Manual Override | Option to manually operate the panel during maintenance or emergencies. |
| Load Management | Optional feature to prioritize critical loads. |
| Interlocking System | Prevents simultaneous connection of grid and generator to avoid backfeeding. |
Main Components
| Component | Role |
|---|---|
| Contactor or MCCB | Switches load between grid and generator |
| Control Relays | Logic for sequencing and interlocking |
| Voltage Sensing Relays | Detects failure or restoration of mains power |
| Timers | Delay settings for generator start/stop and transfer |
| Indicator Lamps | Shows current power source and panel status |
| Selector Switches | Manual/Auto/Off mode control |
| HMI or Display Panel (optional) | Displays status and fault codes |
How It Works – Step-by-Step
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Normal Operation: Load is powered by the main utility supply.
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Power Failure: Panel senses loss of mains voltage.
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Generator Start Signal: Panel sends a signal to start the DG set.
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Power Transfer: After confirming stable generator voltage, load is transferred.
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Mains Restored: Panel senses grid power has returned.
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Load Reverts to Grid: Load is safely transferred back to the main supply.
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Generator Cooldown & Stop: Generator stops after a delay or cooldown period.
Applications
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Residential buildings
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Commercial complexes
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Hospitals
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Banks and ATMs
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Data centers
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Industrial plants
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Telecom towers
Advantages
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Ensures uninterrupted power supply
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Reduces manual intervention
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Enhances equipment protection
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Increases operational reliability
