Electrical Room Power-On Safety Operation Guide

Power Supply Procedure for Low-Voltage Electrical Rooms

I. Pre-Power-On Preparations

• Clean the electrical room thoroughly; remove all debris from switchgear and transformers, and secure all covers.

• Inspect busbars and cable connections inside transformers and switchgear; ensure all screws are tightened. Live parts must maintain adequate safety clearance from cabinet enclosures and between phases.

• Test all safety equipment before energizing; use only calibrated measuring instruments. Prepare fire-fighting equipment and necessary warning signs (e.g., "Danger", "Do Not Close").

• Verify that grounding and bonding systems are intact and reliable.

• Check secondary wiring in switchgear for correctness and ensure all terminals are securely tightened.

• Set protective relay settings for all equipment according to the electrical system drawings.

II. Power-On Procedure

• Open the grounding switch of the transformer cubicle in the 10kV switchroom, then insert the circuit breaker trolley into position.

• Close the load switch in the high-voltage incoming line isolation cubicle.

• Press the transformer closing button to perform five inrush energizations, with a 5-minute interval between each.

• Sequentially insert and close each low-voltage switchgear drawer unit. Use a multimeter to verify normal voltage and confirm no abnormalities in all low-voltage cabinets.

• After all equipment is energized, operate under load for 24 hours for observation and testing.