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Maintenance and recovery of malfunctions Corrective Maintenance & Repair

From failure to validation recovery,
Put the system under control.
Re-entry

Engineering trouble management and recovery services for large BESS
SAFE
Security priority Risk controlled.
EVD
Evidence-driven Retroactive judgement
ENG
Engineering Collaboration Root orientation
PASS
Verify Restore Ongoing

Our processing.

01
Fault isolation and risk controlSecure border confirmed.
02
Evidence collection and timingUnified Event Timeline
03
Root positioning and impact analysisMore clues.
04
Recovery decision and programme confirmationMandate for risk assessment
05
Replace / Repair and Process ValidationControlled works performed
06
Function Test and Performance ValidationRecover layer by layer
07
Controlled recovery and grid confirmationRestore Run
08
Repetition and preventive measuresContinual Improvement
Engineering failure tree: from multiple threads to single point restoration to validation recovery

Take out the cause of the malfunction with real engineering evidence to restore usability by the controlled steps

BMS Evidence

  • Alert / Event Record
  • SOC / SOH abnormal
  • Insulation changes
  • Balance and Single Difference

PCS / EMS Evidence

  • DC bus status
  • Power fluctuations
  • Communication Status
  • Protect Actions

Thermal management evidence

  • Temperature Trends
  • Flow / Pressure Change
  • Pump valve and winder state
  • Thermal imaging

Fire and environmental evidence

  • Smoke/ Temperature Event
  • Ambient temperature and humidity
  • Fire service.
  • Aqueous events
Root shrunk.
Engineering repairs
Positioning failure component: BMS power supply/ communications interface
Validate recovery (layer by layer)
Functional test passed.Electricity / Communications / Control
✓
Performance test passed.Temperature/ Power/ Efficiency
✓
Protect authentication passProtect / Lock / Restore Conditions
✓
Operation observation passes.Trends / Stability
✓
✓ Controlled reconnection
Into observation period

Our approach

Safe, transparent and verifiable engineering maintenance and restoration

Safety isolation and risk control

  • Operational permit and boundary
  • LOTO safety isolation
  • Energy release confirmed.
  • Operational risk identification

Multi-source evidence collection and alignment

  • BMS / PCS / EMS Data
  • Event and alarm records
  • Field test data
  • Photos and original records

Root analysis and impact assessment

  • Fault tree analysis
  • Impact scope assessment
  • Refacing risk analysis
  • Rehabilitation of boundary judgements

Recovery decision and programme confirmation

  • Maintenance / replacement path
  • Risk and parking assessment
  • Identification of spare parts and resources
  • Client authorization.

Replacement / Restoration Process Validation

  • Retroactive identification of spare parts
  • Controlled dismantling execution
  • Process parameters confirmed
  • Clean and Reset

Stage & Validation

  • Electricity and communication tests
  • Functional protection test
  • Performance Power Verification
  • Network restoration test

Controlled recovery and grid confirmation

  • Networking review
  • Level-by-stage confirmation
  • Operational Parameter Monitoring
  • Return to status for signature

Repetition and preventive measures

  • Fault Root Rewinding
  • Update of the knowledge base
  • Maintenance strategy optimization
  • Screening of similar assets

Genetics and traceability of spare parts

Each key component can trace sources, batches, life cycle and location

Widget CategorySpecifications / ModelBrand / VendorSerial number/ BatchSourceOrganisationInstallation TimeLife cycle state
Battery moduleLFP module 280ahCATL LF280KCN-A1283KX1P7TIANCHU spare parts warehouseCluster-03
Rack-12 / Slot-04		2025-05-16Active
Fan UnitCSC-300ATIANCHUCSC300A25040123TIANCHU spare parts warehouseCluster-03
Rack-12		2025-05-16Active
DC contactorHVC-500ATE ConnectivityTEHVC500A250102TIANCHU spare parts warehouseCluster-03
Rack-12		2025-05-16Active
Melting machineDC 1500V 500ABussmann170M6616250331TIANCHU spare parts warehouseCluster-03
Rack-12		2025-05-16Active

DMO Incident Rewinding (flow icon, non-actual performance)

Synchronising folder

A 100 MW/200 MWh power station is charged with a Cluster-03 local temperature rise anomaly and the system triggers a drop.

Scope of impact

Scope of impact1 Cluster-03
System Availability-8.7%

Disposal target

To locate the physical root causes and restore the system ' s rated capabilities to the extent that they are safe and manageable.

Critical period

Isolation and positioning6.2 Hours
Repair and Validation10.5 Hours
Restore networking1.3 Hours
Cumulative18.0 Hours

Fragmentation process

BMS Alert: Local warming
PCS parameters: DC side normal
Heat management: Wind abnormalities
Electrical: No apparent anomalies
Environment: Temperature normal
Location: Cluster-03/Rack-12
Local windways blocked.
• Dismantling, cleaning and replacing abnormal fan units
Validation pass: restoration of rated capacity

Restore Authentication Path (Excerpt)

Critical temperature change

Recharge power restored.

IndicatorsBefore repairAfter repairChange
Local temperature difference6.8°C1.7°C-75%
Cooling airflow62%96%+34%
Available Power183.2 MW200.1 MW+9.2%
System efficiency91.2%96.6%+5.4%

The problem is that the problem is being solved under control and evidence.
Make the system safe, stable and sustainable.

Engineering teams can provide support as contracted