The most suitable triggering method depends on the type of circuit breaker and the control power supply conditions: For scenarios with a DC operating mechanism and where the instrument can match the voltage, internal triggering is the simplest to operate and offers the most precise control, making it the preferred option; if using AC power, a permanent magnet mechanism, or an existing complete control circuit, external triggering should be used; manual triggering is suitable for special commissioning or troubleshooting scenarios without an electrical control mechanism.
Internal Triggering: The Optimal Choice Under Standard Operating Conditions
Applicable Conditions: The circuit breaker has a DC electromagnetic or spring operating mechanism, and the instrument's output voltage (e.g., DC 220V) matches the coil's rated voltage.
Advantages: The instrument provides unified control power output and signal acquisition, ensuring precise timing and high data consistency; Wiring is simple, requiring only the connection of the control line to the "internal triggering" port, eliminating the need for an external operating circuit.
Precautions: The original control power supply fuse in the control cabinet must be disconnected to prevent short circuits or equipment damage caused by parallel operation of internal and external power supplies; Not suitable for AC closing coils or scenarios with voltage mismatch.
Recommended Scenarios: Routine preventative testing, factory inspection, centralized substation maintenance, and other controllable environments.
External Trigger: A Flexible Adaptation Solution for Complex Sites
Applicable Conditions: Uses AC operating power supplies, permanent magnet circuit breakers, or situations where on-site access to the instrument's control power supply is not permitted.
Advantages: Completely dependent on on-site power supply, strong compatibility, avoiding issues related to insufficient instrument output capacity; Can be used with oscilloscope mode to acquire coil current waveforms for analyzing deep-seated faults such as mechanism jamming and abnormal core movement.
Setup Points: Connect the "External Trigger" line in parallel across the closing/opening coil. The instrument uses the moment the coil is energized as the timing start point; Supports AC/DC 10–300V wide voltage acquisition, adapting to the needs of mixed AC/DC power grids.
