This daily checklist is designed for the trial/commissioning phase of a 1000 MW solar plant, focusing on verifying equipment functionality, safety compliance, and power generation performance (e.g., during the 30-day trial run).
1. Safety and Housekeeping (Daily Pre-start)
Safety Gear & Protocol: Verify all personnel are using proper PPE (Hard hats, safety shoes, arc flash protection).
Lock-out/Tag-out (LOTO): Verify LOTO is in place for any maintenance work to prevent accidental energization.
Site Security & Access: Check perimeter fencing and ensure security protocols are active.
Housekeeping: Ensure inverter rooms, substations, and cable trenches are clean and free of combustible materials.
2. PV Field Array Inspection (Module Maintenance)
Visual Inspection: Inspect modules for damage (cracks, breakage).
Soiling & Shading: Check for excessive dust, bird droppings, or new shading objects (vegetation growth).
Mounting Structure (MMS): Inspect for loose nuts/bolts and check for corrosion.
Cable Management: Ensure DC cables are not dangling, damaged, or resting on the ground.
Vermin/Bird Control: Remove bird nests or vermin from arrays and junction boxes.
3. DC System & Combiner Boxes
Combiner Box (SMB) Inspection: Verify all SMBs are sealed, water-tight, and free of moisture/corrosion.
DC Terminations: Check that all connections are tight to prevent hot spots.
Fuse Holders: Verify all string fuses are properly seated.
Polarity Check: Confirm correct polarity at the inverter input.
4. Inverter Station (PCU)
Alarm/Warning Check: Review SCADA for active alarms, trips, or derating.
Environmental Check: Confirm cooling fans, filters, and heat sinks are operating properly.
Voltage/Current Check: Monitor DC input and AC output voltage, current, and frequency.
Energy Generation: Record daily active power and compare against expected generation.
5. AC System, Transformers, & Switchyard
Transformer Condition: Check WTI (Winding Temperature Indicator) and OTI (Oil Temperature Indicator).
Oil Levels & Leakage: Inspect transformer conservator tank (MOG level) and check for oil leakages.
Breakers/Isolators: Verify status of AC breakers and protection relays.
Earthing System: Visually check earthing strips for continuity and proper connections.
Breather Inspection: Check the dehydration breather (Silica Gel) of the transformer.
6. SCADA, Communication & Weather Station (WMS)
Data Accuracy: Ensure all inverters, SMBs, and meters are online and sending data.
Sensor Cleaning: Clean irradiance sensor plates and ambient/cell temperature sensors.
Time Synchronization: Verify all devices are synchronized with the central SCADA time.
Performance Evaluation: Monitor for any underperforming zones.
7. Performance & Reporting (Trial Period Specific)
Performance Ratio (PR): Calculate daily PR (Target >75-80% based on project standards).
Capacity Utilization Factor (CUF): Monitor daily CUF.
Energy Delivered: Log total energy delivered to the grid (kWh/MWh).
Logbook Maintenance: Ensure all faults and maintenance actions are documented in the plant logbook.
8. Civil & Site Infrastructure
Drainage: Check for blockages in drainage channels to prevent water logging.
Roads: Ensure site roads are accessible and in good condition for vehicular movement.
Street Lights/CCTV: Verify proper operation of per
imeter lighting and surveillance cameras.
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