Large fluctuations in circuit breaker operation time measurements are a common problem in field operation and maintenance. The following outlines several key points of a switch characteristic tester from the perspective of application scenarios.
There are many types of switches in substations, and the dynamic characteristic testing requirements for oil switches, vacuum switches, and SF6 switches differ. If an instrument can only test a single type, multiple devices must be carried on site. This tester supports mechanical characteristic testing for indoor and outdoor low-oil, multi-oil, vacuum, and sulfur hexafluoride switches, reducing the number of trips to retrieve instruments.
The current waveform, current value, and coil resistance of the opening and closing coils are direct bases for judging the health of the coils and whether the secondary circuit is normal. This instrument can synchronously record the current waveform and amplitude of the opening and closing coils and measure coil resistance, helping operation and maintenance personnel distinguish between mechanical jamming and electrical circuit abnormalities.
Parameters such as opening and closing asynchronism and bounce time directly affect whether the switch can reliably interrupt. This instrument uses a microcontroller as the core for sampling, processing, and output, and sampling accuracy affects the reliability of judgment. It operates through human-machine dialogue with Chinese character prompts, displays results in Chinese characters, and prints output, making on-site readings intuitive.
Some comprehensive testers integrate the function of measuring the contact resistance of the main circuit, using the 100A DC voltage drop method. In this way, mechanical characteristics and circuit resistance data can be obtained simultaneously in one wiring setup, making it suitable for occasions requiring comprehensive judgment of switch status.
The electromagnetic environment at substation sites is complex, and instruments need a certain anti-interference capability. This tester is small in size and light in weight, making it easy for operation and maintenance personnel to carry to each bay. It is simple to operate and suitable for daily routine maintenance and troubleshooting.
