Focused on Circuit Breaker Analyzer and Transformation Ratio Testing Equipment
Recently, a delegation of client representatives from Bangladesh's power sector visited Goldhome for an inspection tour. The company's general manager, accompanied by the technical team, warmly received the visitors from afar and escorted them through the production workshops, R&D centre, and product exhibition hall. During the visit, Goldhome's independently developed High-Voltage Switch Mechanical Characteristics Tester and Fully Automatic Ratio Tester garnered particular attention from the clients. Both parties engaged in in-depth discussions regarding product technical specifications, application scenarios, and operational standards.
An engineer connected the tester to a high-voltage vacuum circuit breaker prototype and demonstrated the complete testing procedure on-site. He first illustrated the sensor installation method: 'The displacement sensor must be securely fixed to the switch's moving contact or operating mechanism to ensure accurate recording of the contact's movement trajectory. For vacuum switches, we typically employ linear sensors, which must be installed perfectly perpendicular to the direction of movement of the moving contact.' Subsequently, he connected the test leads, configured the circuit breaker model and rated parameters, and entered the test interface.
'The core of high-voltage switch mechanical characteristic testing lies in measuring parameters such as closing and opening times, synchronisation, bounce duration, travel distance, and velocity,' the engineer explained while operating the equipment. "Our instrument employs high-precision Hall sensors and optical encoders, capable of recording the entire switching process with a time resolution of 0.1 milliseconds and a displacement resolution of 0.1 millimetres. "
As the engineer pressed the 'Open' button, the circuit breaker actuated instantly. The tester's screen displayed real-time data including opening time, synchronisation deviation, and bounce count, automatically plotting displacement-time and velocity-time curves. The technical lead of the client delegation commended the data's precision and inquired about on-site anti-interference measures. The engineer explained: 'The instrument incorporates a high-speed digital filter and employs opto-isolation technology to effectively eliminate electromagnetic interference, ensuring stable and reliable test data. In high-interference environments, we can activate additional filtering functions. While this sacrifices 0.5ms of precision, it guarantees data validity.'
The engineer then demonstrated the fully automatic transformer ratio tester's operational sequence. He connected test leads to the terminals of a small three-phase transformer sample and configured the transformer connection group (e.g., Yyn0). Upon powering on, the device automatically entered the measurement interface. The engineer pressed the 'Start Test' button, prompting the instrument to sequentially apply low-voltage test signals to the high-voltage side while simultaneously measuring the induced voltage on the low-voltage side. Within a mere 10 seconds, the transformer ratio, error rate, and connection group designation were displayed.
During the inspection, the client delegation also toured Goldhome's manufacturing workshop, high-voltage testing hall, and R&D laboratory. The orderly production lines, rigorous quality control procedures, and professional explanations from R&D personnel left a profound impression on the visitors.
As a national high-tech enterprise, Goldhome has specialised in high-voltage testing since its establishment in 2008. Occupying over 10,000 square metres of factory space, the company holds more than 45 patented technologies and over 10 software copyrights. It has evolved into a renowned domestic manufacturer of high-voltage power testing equipment and a provider of testing services. In 2021, it completed the full acquisition of Wuhan San Gao Electrical Testing Equipment Co., Ltd., which possesses over three decades of experience in manufacturing ultra-high voltage partial discharge-free testing apparatus. This acquisition further enhanced the company's technical expertise within the high-voltage testing sector. Goldhome maintains close collaborative relationships with research institutions such as the State Grid Electric Power Research Institute and the School of Electrical Engineering at Wuhan University, continuously driving product innovation.
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