Time parameter (accuracy requirement ≤0.1ms, high-end models可达 0.01ms)
Closing and opening time and three-phase inconsistency: This evaluates the consistency and coordination of the circuit breaker’s operating mechanism, serving as a key indicator affecting arc extinguishing performance.
Closing bounce time: Reflects the rebound characteristics during contact closure; excessive bounce time may lead to contact welding or generate operational overvoltage.
Speed and Trip Parameters
Opening/closing speed: Refers to the motion velocity of contacts at the moment of separation or closure, directly affecting arc extinction and contact erosion.
Overtravel/opening distance: Reflects contact wear and the movement trajectory of the moving contact, serving as a key criterion for assessing contact life; the typical speed measurement range covers 0–20 m/s.
Electrical Operating Characteristics
Closing/Opening Coil Current Waveform: By monitoring the dynamic changes in coil current, it is possible to effectively analyze the core movement status of the electromagnet, coil resistance, and mechanical jamming conditions of the operating mechanism.
Operating Voltage Characteristics: Verify whether the circuit breaker can operate reliably at specified low voltages (e.g., 30% to 65% of rated voltage), preventing failure to trip or unintended tripping caused by fluctuations in DC power supply.
Dynamic Curve Analysis
The instrument’s time-travel (S-t) characteristic curve and coil current waveform provide maintenance personnel with intuitive diagnostic references, serving as a crucial tool for in-depth equipment condition assessment.
Key Considerations and Technical Factors in Selecting a Circuit Breaker Characteristic Tester
Selecting the appropriate tester requires a comprehensive evaluation based on field conditions and testing requirements, considering the following technical aspects:
Accuracy and Channel Configuration
It is recommended to select a model with a time measurement resolution of 0.01 ms to ensure accurate capture of microsecond-level phenomena such as bounce and synchronization.
The standard 12-channel metal contact input can meet the testing requirements for most three-phase circuit breakers (including auxiliary contacts). For GIS or circuit breakers equipped with closing resistors, additional test channels can be expanded as needed.
Sensor Compatibility
Sensors are fundamental to accurate measurement of travel and speed. The instrument should support compatible linear displacement sensors suitable for vacuum, oil, and direct-acting SF6 circuit breakers; rotary angle sensors for angular travel operation in SF6 circuit breakers and GIS equipment; and non-contact laser sensors for testing scenarios where contact-type sensors are difficult to install. The ease and reliability of sensor installation are key factors in improving field test efficiency.
Built-in Power Supply and Triggering Methods
Equipped with an internal adjustable DC power supply (30–250V / 20A), the device simplifies on-site wiring and directly drives circuit breaker operation tests. It supports multiple triggering modes—including internal, external, and manual—offering flexible adaptation to various control circuits.
Data Management and Human-Machine Interface
An industrial-grade color touchscreen, large-capacity local storage, USB data export, and built-in thermal printing capabilities form the essential configuration for enhancing fieldwork efficiency and standardizing data management.
Electromagnetic Compatibility
Ultra-high voltage substations at 500kV and above typically involve strong electromagnetic interference. The instrument features anti-interference designs such as optoelectronic isolation and hardware filtering, which are critical to ensuring stable and reliable test data.
Industry Terminology Clarification
In practical engineering applications, both “circuit breaker characteristic tester” and “high-voltage switch characteristic tester” are widely used. There is no substantial difference between them in terms of test objects, functions, or performance—they reflect merely industry usage habits and naming conventions. Similarly, equivalent terms such as “high-voltage switch dynamic characteristic tester” and “circuit breaker dynamic characteristic tester” refer to the same type of testing equipment.
Post time: Aug-03-2026