The correct use of a high-voltage switch tester requires understanding its structural features and standardized operating procedures to ensure accurate test data and the safety of personnel and equipment.
Core Structural Features (For easier understanding of operating principles)
Integrated Portable Design: Utilizes an aluminum alloy chassis, integrating the main unit, power supply, printer, and interfaces. The entire unit is lightweight (approximately 5–10 kg), suitable for outdoor substation operations.
Large LCD Screen: Equipped with a 320×240 or higher resolution LCD screen, supporting Chinese character menu prompts for intuitive operation.
Built-in Adjustable DC Power Supply: Output voltage range is typically DC 30–270V, capable of driving various circuit breaker opening and closing coils, supporting low-voltage operation testing.
Multi-channel Acquisition System: Supports simultaneous detection of 6–12 circuit breakers; Compatible with linear/rotary displacement sensors for measuring travel and speed.
Multi-channel Acquisition System: Supports simultaneous detection of 6–12 circuit breakers; Compatible with linear/rotary displacement sensors for measuring travel and speed. Safety Protection Mechanism: Equipped with delayed power-off, overload alarm, and grounding protection functions to prevent damage to equipment and circuit breakers.
Correct Operating Procedures
1. Pre-operation Preparation
Equipment Inspection: Confirm that the tester is undamaged, and that the test leads, sensors, and power cords are complete and well-insulated.
Environmental Requirements: Select a dry location free from strong electromagnetic interference. Ensure the power supply is stable at AC 220V±10%.
Switch Status Under Test: Ensure the circuit breaker is de-energized, display a "Do Not Close" warning sign, and confirm that mechanical parts are flexible and free from jamming.
2. Wiring Connection
Break Wire Connection: Connect the yellow, green, and red wires to the upper stationary contacts of phases A, B, and C respectively. Short-circuit the black common wire to the lower moving contact and then ground.
Control Line Connections:
Internal Trigger: Connect the control line to the instrument's "Control Power" port. Connect the red and black wire to the gate coil and the green and black wire to the trip coil (depending on the current switch status).
External Trigger: When using an external power supply, connect the trigger signal line to the "External Trigger" port.
Sensor Installation: If speed measurement is required, fix the linear or rotary sensor to the operating mechanism shaft and connect the output line to the corresponding sampling port.
