Solar Plant HT Evacuation: Do’s & Don’ts That Decide Efficiency & Safety”
🟦 Slide 1 – Hook Slide
⚡ HT Evacuation Can Make or Break Your Solar Plant
Most EPCs focus on modules.
Real failures start at 11kV / 33kV.
Let’s talk about what actually decides efficiency & safety.
🟦 Slide 2 – Why HT Evacuation Matters
HT evacuation is not just power transfer.
It determines:
✔️ Plant losses
✔️ Transformer life
✔️ Protection reliability
✔️ DISCOM compliance
✔️ Long-term plant availability
Poor HT design = Expensive mistakes.
🟦 Slide 3 – DO’s: Design & Engineering
✔️ Finalize voltage level (11 / 22 / 33 kV) as per DISCOM approval
✔️ Keep inverter transformers close to inverter blocks
✔️ Optimize HT routing to reduce cable length
✔️ Size conductors based on current + voltage drop + short circuit level
✔️ Plan future expansion during layout stage
Design smart → Save losses for 25 years.
🟦 Slide 4 – DO’s: Equipment & Installation
✔️ Use DISCOM-approved VCB / RMU / CT / PT / LA
✔️ Ensure calibrated torque tightening
✔️ Engage certified HT cable jointers
✔️ Maintain proper bending radius
✔️ Provide oil soak pits & fire separation
Loose joints = Future breakdown.
🟦 Slide 5 – DO’s: Protection & Testing
✔️ Coordinate OC / EF / UV / OV properly
✔️ Perform IR, HV, contact resistance & relay injection tests
✔️ Confirm earthing resistance within limits
✔️ Install lightning arresters at line entry
✔️ Follow strict LOTO system
Protection is your last line of defense.
🟦 Slide 6 – DO’s: Documentation & O&M
✔️ Record relay settings & test reports
✔️ Label feeders and transformers clearly
✔️ Monitor voltage, losses & hotspot temperature
✔️ Conduct periodic thermography
Commissioning is not the end.
It’s the beginning of responsibility.
🟥 Slide 7 – DON’Ts: Design Errors
❌ Don’t keep long HT routes unnecessarily
❌ Don’t ignore voltage drop calculations
❌ Don’t design without DISCOM coordination
❌ Don’t mix radial & ring philosophy carelessly
Poor planning = Recurring problems.
🟥 Slide 8 – DON’Ts: Installation Mistakes
❌ Don’t allow under/over-torqued joints
❌ Don’t use unapproved connectors
❌ Don’t leave exposed strands
❌ Don’t allow wrong phase sequence
One mistake can trip the entire plant.
🟥 Slide 9 – DON’Ts: Safety Violations
❌ Never perform live HT work
❌ Never energize without earthing confirmation
❌ Never allow untrained manpower
❌ Never bypass protection during trial charging
No shortcut is worth a shutdown.
🟥 Slide 10 – DON’Ts: O&M Negligence
❌ Don’t skip thermography
❌ Don’t operate with defective relays
❌ Don’t ignore abnormal heating or sound
❌ Don’t delay rectification
Small warning signs prevent major failures.
🟦 Slide 11 – Key Engineering Message
HT evacuation is not just infrastructure.
It decides:
⚡ Efficiency
⚡ Safety
⚡ Reliability
⚡ Project profitability
Most plant losses come from what we don’t do right.
🟦 Slide 12 – CTA Slide
If you're working on:
🔹 11kV Solar Evacuation
🔹 33kV Switchyard
🔹 DISCOM Interconnection
I share practical HT QA & protection insights regularly.
Comment “HT CHECKLIST” if you want a structured HT inspection checklist.
📌 Caption for LinkedIn Post
In solar projects, real long-term performance depends on HT evacuation design and execution.
Most failures are not because of panels — but because of poor HT engineering discipline.
If you're a Solar EPC, QA Engineer, or Electrical Consultant working on 11kV / 33kV systems, these Do’s & Don’ts can save lakhs in rework and downtime.
Comment “HT CHECKLIST” to get a structured QA inspection format.
#SolarEngineering #HTEvacuation #SolarEPC #ElectricalEngineering #Switchyard #SolarQA #RenewableEnergy #IndianSolar
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