User Manual for AEG VB Vacuum Circuit Breaker

Quick guide from the manual

The AEG VB Vacuum Circuit Breaker is designed for 36/40.5kV power systems. It is intended for use as protection and control equipment in industrial and mining enterprises, power plants, and substations. Important: All installation, operation, and maintenance must be performed by professionally trained, full-time electrical personnel. Ensure the equipment is used within its rated parameters and under normal indoor environmental conditions.

Operating mechanism

The circuit breaker utilizes a spring energy storage mechanism. Energy storage can be performed manually or via a motor:

• Manual storage: Insert the energy storage handle into the manual energy storage shaft and shake it clockwise until the indicator shows the spring is charged.
• Motor storage: The motor automatically charges the spring when power is connected.
• Closing: Press the "closing" button or use remote operation to trigger the closing coil.
• Opening: Press the "opening" button or connect the external power supply to the opening coil.

Propulsion mechanism

For withdrawable types, the handcart must be correctly positioned within the switch cabinet:

• Cabinet entry: Close the interlocking piece valve, set handles to position B, and push the handcart until pins correspond to positioning holes.
• Working position: Use the operating handle to advance the handcart. A "click" sound indicates the clutch has slipped, meaning the handcart is in position.
• Emergency opening: Use the emergency opening handle (rotate counterclockwise) if required.

Installation and commissioning

When lifting the circuit breaker, use the designated lifting points. Ensure the upper and lower outlet arms are not stressed during movement. Before commissioning, verify the connection status of the primary circuit, secondary circuit, and grounding body. Perform a manual operation test to ensure the mechanism functions correctly.

Maintenance

The circuit breaker is largely maintenance-free during normal use due to its durable design. However, periodic inspections are required:

• 5-year inspection: Check grease on bearings, verify component function, and perform a comprehensive appearance inspection.
• 10-year maintenance: Re-apply grease to supporting shafts and bearings, check fasteners for looseness, and review the operating mechanism.
• Cleaning: Clean dust from insulating parts using a dry cloth. Use household alkaline cleaning agents if necessary, but avoid carbon tetrachloride or trichloroethylene.

Safety and storage

Always disconnect auxiliary power before maintenance. Store the circuit breaker in a dry, well-ventilated room at temperatures not lower than -25°C. Protect the unit from dust and moisture during storage.