RESIBLOC Marine 630kVA 3300/400V
ABB Marine Transformers. ABB (now Hitachi Energy) manufactures transformers specifically for maritime applications, certified according to classification societies (CCS, ABS, BV, DNVGL, LR, KR, NK, RINA). Marine transformers must meet reduced noise, vibrations, limited installation space, special water cooling and safety requirements. The devices are for resistance
Inspector Detail
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Common issues
- Winding surface contamination (dust, salt) reducing creepage distance and insulation resistance
- Partial discharge/tracking on the resin surface from humidity and airborne contaminants
- Overheating from blocked ventilation openings or high ambient engine-room temperature
- Loose terminations or busbar connections causing hot spots
- Cracking of the cast-resin coil surface from repeated thermal cycling over time
- Cooling fan failure (if the forced-air option is fitted) reducing rated capacity
Inspection checklist
- Measure insulation resistance winding-to-winding and winding-to-earth
- Visually inspect the resin coil surface for cracks, tracking marks or contamination
- Check winding temperature via the built-in RTD/PTC sensors and verify alarm/trip settings
- Clean ventilation louvres/openings and confirm airflow is unobstructed
- Carry out a thermographic (infrared) survey of terminations and busbar connections under load
- Verify tap-changer links (if fitted) are correctly set and tight
- Check earthing connections and IP23 enclosure integrity (covers, gland seals)
- Confirm cooling fans (if the AF-rated variant is fitted) operate and alarm correctly on failure
Service intervals
| Insulation resistance test | annually |
| Visual/thermal inspection | annually, or per class survey cycle |
| Cleaning of windings and ventilation paths | annually, more often in dusty or salt-laden engine room air |
| Connection torque check | at each annual inspection |
Typical wear limits
| Insulation resistance | general dry-type transformer practice is to investigate any reading trending sharply down from the commissioning baseline, or falling below roughly the order of 1 MOhm per kV of rated voltage - confirm against ABB's acceptance criteria and the classification society's guidance rather than a fixed pass/fail number |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- RTD/PTC temperature sensor set
- Cooling fans (forced-air variant only)
- Termination/connection hardware (bolts, lugs - standard items, not transformer-specific)
Safety
- High-voltage primary side (3300 V) - lockout/tagout and verify dead before any access
- Residual charge can remain on the cast-resin surface after de-energising - allow discharge time per maker procedure
- Hot surfaces during and shortly after operation near cooling openings
- Arc-flash hazard during live thermographic survey or connection checks - maintain safe working distance and PPE per the ship's electrical safety procedure
Class survey
Transformers serving essential/critical services normally fall within Continuous Survey Machinery scope. Class wants insulation resistance test records, thermographic survey reports where taken, and confirmation that temperature protection/alarm devices are tested and operative at each periodical survey. The winding itself is not a field-replaceable spare - a winding fault ordinarily means transformer renewal, not repair.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Measure insulation resistance between HV winding to ground and between windings (U-V, V-W, W-U, U-Earth, V-Earth, W-Earth) with megohmmeter (500V DC standard); measured value minimum 100x operating voltage; perform before commissioning
Winding temperature under load according to IEC 60076-2 (max. 98°C continuously at 30°C ambient, Class A paper-oil insulation); infrared scanning for hot spots at terminals; check terminal tightness after first week of operation
Visual inspection for salt crystal deposits, surface rust, pitting on fittings and joints; perform regular fresh water rinsing; check surface coating for blistering, flaking; inspect insulators for tracking patterns
After cleaning due to contamination, check for: rust spots on core steel laminations, carbonization traces or tracking on windings, discoloration indicating overtemperature or loose connections; cracks, chips or contamination on windings
Check for cracks, deformations, pressure marks; inspect bushing contamination and tracking traces; check protective enclosure sealing and cable ducts for moisture ingress
Check oil level, color and moisture content; verify dielectric strength by oil tests; perform dissolved gas analysis (DGA)
Type-general inspection and maintenance points for this equipment category — not model-specific.
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