Transformer Installation Environment, Storage & Wiring Specification
1. Operating and Installation Environment Requirements
The transformer shall be installed and operated under the following standard environmental conditions to ensure stable performance and long service life:
Temperature & Humidity: Ambient temperature ranging from 0℃ to 40℃; relative humidity lower than 70%.
Altitude: Maximum installation altitude shall not exceed 2500 meters above sea level.
Ventilation & Sun Protection: Keep the unit away from rain, moisture, high heat and direct sunlight. Maintain a minimum clearance of 40 cm between heat dissipation vents and surrounding obstacles to ensure unobstructed heat dissipation.
Clean Environment: Do not operate the transformer in areas with corrosive gas, corrosive liquid, accumulated dust, conductive fibers or metal shavings, which may cause insulation damage and short-circuit risks.
Anti-Interference & Anti-Vibration: Avoid installation locations with severe mechanical vibration or strong electromagnetic interference.
2. Storage and Transportation Requirements
During long-term storage and transportation, avoid inverted placement and severe impact or extrusion, so as to prevent structural deformation, internal coil displacement and insulation damage.
3. Standard Wiring and Commissioning Procedures
Follow the standardized wiring steps below for safe and compliant installation:
Insulation Resistance Test: Short-circuit all input and output terminals. Use a 1000V megohmmeter to measure the insulation resistance between the short-circuited terminals and the grounding wire. The qualified insulation resistance value shall be greater than 2 MΩ.
Cable Cross-Section Selection: Select input and output power cables with a suitable cross-section according to the operating current. The recommended current density is 2–2.5 A/mm² to avoid cable overheating and power loss.
Phase and Ground Wiring: Connect the three-phase input and output cables strictly according to the terminal color marking: yellow for Phase A, green for Phase B, and red for Phase C. Connect the neutral wire to the transformer neutral terminal. The equipment shell and transformer neutral point must be reliably grounded. Both the system neutral wire and protective ground wire are derived from the transformer neutral point. For transformers equipped with a chassis, connect the ground wire to the marked grounding terminal on the chassis.
Double-check all input and output connections to confirm correct wiring before power-on.
4. No-Load Test and Load Operation
Power on the transformer under no-load condition first. Verify that the input and output voltage values are within the standard range. Meanwhile, check for abnormal noise, sparking, burning odor or other faults inside the equipment. Cut off the power supply immediately if any abnormality occurs.
After the no-load test runs stably without faults, connect the load formally and start normal operation.