Regular maintenance of CHH Power’s power transformers (oil-immersed and dry-type) is critical to extending service life, ensuring operational safety, and preventing unplanned downtime. Below is a systematic, standardized maintenance framework—organizing key checkpoints into actionable modules aligned with CHH Power’s product design and safety standards.
1. Oil & Oil Level Maintenance (Oil-Immersed Transformers)
Oil quality and stable oil levels are foundational to insulation and cooling performance—adhere to the following checks:
- Oil Temperature & Leakage: Ensure operating oil temperature is within the rated range (refer to CHH Power’s nameplate). Confirm no oil leakage or seepage at joints, valves, or tank surfaces.
- Oil Level Alignment: The conservator’s oil level must match the ambient temperature (per the marked scale on the oil level gauge). For bushings, verify normal internal oil level—no underfilling or overfilling.
- Moisture Absorber Condition: Check that the moisture absorber is intact, with dry adsorbent (no discoloration indicating moisture absorption). Replace adsorbent promptly if damp.
- Gas Relay Status: Ensure the gas relay contains no accumulated gas—drain any gas per CHH Power’s operation manual and record the occurrence.
2. Appearance & Component Integrity Checks
Inspect critical components for damage, contamination, or wear to avoid performance degradation:
- Bushings: Check external surfaces for no cracks, chips, severe oil stains, or discharge marks. Maintain clean bushings to prevent insulation breakdown.
- Pressure Relief Devices: Verify the pressure relief valve, safety air passage, and explosion-proof membrane are intact—no signs of deformation, corrosion, or damage.
- Control & Terminal Boxes: Ensure all control boxes and secondary terminal boxes are tightly sealed to prevent moisture ingress. Check for no condensation, dust buildup, or loose terminals.
- Dry-Type Transformer Specific: Keep the transformer surface free of contamination (dust, oil, or debris) to maintain insulation performance. Regularly clean the core, windings, and casing components per CHH Power’s guidelines.
3. Operational Status Monitoring
Real-time observation of operating parameters ensures early detection of abnormalities:
- Sound Check: The transformer should emit a uniform, low humming sound (normal electromagnetic vibration). Investigate immediately if there are abnormal noises (e.g., buzzing, cracking, or knocking).
- Radiator Performance: For oil-immersed models, confirm all radiator sections have similar touch temperatures—indicating uniform heat dissipation. Verify cooling fans, pumps, or accessories operate normally (no jamming or abnormal noise).
- Connection Temperature: Check lead connectors, cables, and bus bars for no overheating signs (e.g., discoloration, scorch marks, or abnormal warmth). Ensure tight connections to avoid resistance-induced heating.
- Tap Changer Function: Verify the tap position aligns with the desired voltage setting, and the power indicator works correctly. Record tap position changes for lifecycle tracking.
4. Environment & Auxiliary System Maintenance
A suitable operating environment safeguards transformer performance:
- Transformer Room Conditions: Ensure no water leakage, intact doors/windows, and functional lighting. Maintain good ventilation to keep the room temperature within CHH Power’s recommended range (typically 15–35°C for indoor units).
- General Cleanliness: Keep the transformer casing, bushings, and surrounding area clean—remove dust, dirt, or corrosive substances regularly to prevent insulation deterioration.
Critical Maintenance Notes
- Perform checks at least quarterly (or monthly for high-load/harsh-environment units) in line with CHH Power’s maintenance schedule.
- Assign qualified technicians to conduct maintenance—all operations must comply with CHH Power’s product manual and national electrical safety standards.
- Document all maintenance findings (e.g., oil level, temperature, component conditions) for future reference and trend analysis.
- Address abnormalities (e.g., oil leakage, abnormal noise, overheating) immediately—do not continue operation until issues are resolved.
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