Dry-Type Transformers User Manual Guide | Installation, Operation & Maintenance

翻译

(Model: _____SCB-13______)

1. Product Overview

Dry-type transformers utilize air-cooled or forced-air cooling technology, eliminating the need for insulating oil. They offer advantages such as fire safety, environmental friendliness, and maintenance-free operation, making them ideal for high-rise buildings, subways, hospitals, and other safety-critical applications. Compliant with GB 1094.11 and IEC 60076-11 standards, they feature low losses and high reliability.

Key Specifications

• Rated Capacity: ___1000______ kVA (Range: 10kVA–20MVA)
• Voltage Class: Primary ____10_____ kV, Secondary ____0.4_____ kV
• Insulation Class: Class F (155°C) / Class H (180°C)
• Cooling Method: AN/AF (Natural Air/Forced Air)
• Protection Class: IP20 (Indoor) / IP45 (Outdoor)

2. Installation Guide for Dry-Type Transformers

2.1 Environmental Requirements

• Indoor Installation: Ambient temperature ≤40°C, humidity ≤90% (non-condensing), with adequate ventilation.
• Outdoor Installation: Requires a weatherproof enclosure to avoid direct sunlight and dust accumulation.
• Safety Clearance:
  • Minimum 0.8m distance from walls, ≥1m overhead space for heat dissipation.
  • ≥1.5m spacing between multiple units.

2.2 Step-by-Step Installation

1. Foundation Preparation: Level concrete foundation with load-bearing capacity ≥1.5x transformer weight.
2. Positioning & Fixing: Use vibration-damping pads and secure bolts to prevent loosening.
3. Wiring Standards:
   • Connect HV/LV terminals using copper busbars or flexible cables to avoid mechanical stress.
   • Verify phase sequence (A-B-C) matches the system.
4. Grounding Protection: Separate grounding for tank and neutral point (resistance ≤4Ω).

3. Operation Instructions

3.1 Pre-Startup Checks

• Insulation Test: Winding-to-ground resistance ≥100MΩ (tested with 2500V megger).
• Cooling System: For forced-air units, verify fan rotation and operation.
• Protection Devices: Ensure temperature controllers and overtemperature alarms function properly.

3.2 Operational Monitoring

• Temperature Management:
  • Winding temperature ≤ insulation class limit (Class F ≤155°C, Class H ≤180°C).
  • Reduce load or shut down immediately if overtemperature alarms activate.
• Load Recommendation: Long-term operation ≤85% rated capacity to extend lifespan.

3.3 Shutdown Procedure

• Normal Shutdown: Gradually reduce load to <10% before power-off.
• Emergency Shutdown: Cut power immediately and document fault symptoms.

4. Maintenance & Troubleshooting

4.1 Scheduled Maintenance

4.2 Common Faults & Solutions

• Issue: Fan failure → Cause: Power fault/bearing jam → Fix: Check circuit or replace fan.
• Issue: Winding overheating → Cause: Overload/blocked vents → Fix: Reduce load or clear airflow paths.

5. Safety Warnings

• Fire Safety: Despite dry design, keep flammable materials away.
• Live Maintenance: Never clean or tighten live parts without de-energizing.
• Moisture Prevention: Use built-in heaters (if equipped) during prolonged idle periods.