The core purpose of conducting circuit breaker characteristic testing is to verify whether the circuit breaker can reliably operate in the event of power system faults or abnormalities, ensuring the safe and stable operation of the power system. This can be carried out from the following three key dimensions:

Ensure effective protection function

The core function of a circuit breaker is to quickly disconnect the circuit in the event of a short circuit, overload, or other faults, to prevent equipment from burning out or accidents from escalating. Characteristic testing (such as opening/closing time, action voltage testing) can confirm that it can accurately move when it needs to be moved - for example, if the opening time is too long during a short circuit, it may cause the cable to overheat and catch fire. Testing can identify such risks in advance.

Prevent equipment failures and accidents

After long-term operation, circuit breakers may experience mechanical component wear (such as jamming of the operating mechanism) and electrical component aging (such as coil moisture). By conducting characteristic tests (such as mechanical characteristics and insulation resistance tests), hidden dangers can be detected early: for example, poor contact between the dynamic and static contacts during closing may cause local overheating, which can lead to damage to the circuit breaker itself. Testing can prevent such "equipment failure" from evolving into a system power outage accident.

Compliant with safety standards and operational specifications

Both national standards in the power industry (such as GB/T 1984) and enterprise operation and maintenance requirements mandate or recommend regular characteristic testing of circuit breakers. This is not only a necessary link to ensure the compliant operation of the power system, but also provides data support for equipment life assessment and maintenance plan formulation (such as comparing multiple test data to determine the performance degradation trend of circuit breakers).