Comprehensive Characteristic Tester is a core device used to detect the mechanical performance and electrical characteristics of high voltage circuit breakers (including vacuum, SF6, oil-poor, and multi-oil circuit breakers) and disconnectors. Since circuit breakers are the most important control and protection components in the power grid, their operational reliability directly affects grid safety. Therefore, this instrument is an essential tool for substation maintenance and acceptance tests. The following is an in-depth analysis based on the 2026 technology status: 1. Core Test Functions A high-quality comprehensive characteristic tester typically integrates the following seven core functions: Time Measurement: Measure opening time and closing time. Measure three-phase non-simultaneity (between phases and between breaks of the same phase), which is a key indicator to prevent system oscillation caused by non-full-phase operation. Measure various time parameters during reclosing (such as "open-close" and "close-open" times). Speed Measurement: Measure initial opening speed, initial closing speed, maximum speed, and average speed. Excessive speed can cause excessive mechanical impact, while too slow speed may lead to contact burning or arc extinction failure. Stroke and Over-travel: Measure total stroke, contact gap (distance when contacts are separated), and over-travel (distance continued after contact closure to ensure contact pressure). Measure rebound amplitude (bounce after closing); excessive rebound can cause contact welding. Current Waveform Analysis: Record the current-time waveform of the opening/closing coil. Determine whether the coil has inter-turn short circuits, core jamming, or insufficient power supply voltage based on waveform characteristics (such as peak value, start time, and core movement inflection point). Low Voltage Operation Test: Automatically output adjustable DC low voltage (30%-65% of rated voltage) to verify whether the circuit breaker can reliably open/close at low voltage, or does not operate below 30%. Operating Voltage Test: Measure the DC resistance of the opening/closing coil. Energy Storage Motor Analysis: Monitor motor starting current and energy storage time to determine the energy storage status of spring or hydraulic mechanisms. 2. Sensor Technology (Key Differentiator)
