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Latest update: 20/01/2020 16:25:36


Delivering electric control systems for public works projects

Through high speed real time control technology, our circuit breakers achieve the optimum phase angle control in an “transformer excitation inrush currents suppression device.” This technology is patented domestically by our company, and we are in the process of applying or patents overseas. Working in software manufacturing, electrical equipment maintenance and construction services as well, as we have built up experience and confidence in these areas. We also handle inquiries from major corporations or foreign companies.


[Product description] This device eliminates all kinds of impairments resulting from magnetizing rush current phenomena which arise when powering up a receiving substation transformer, and has the following main features. ・Super control functionality. When a closing operation instruction is received from the circuit breaker, it automatically issues a control command which performs the closing operation at the optimal phase angle, minimizing magnetizing inrush currents. ・Compact size and excellent maintainability. With a size identical to an overcurrent relay unit, connecting input and output signals is simple, and regular maintenance is not required. ・Powerful fail-safe and history management functions. The main control area does not inhibit the operation of “close” and “cut off” functions, and convenient tool software makes for flawless history management. [Authorization/Certification] ISO9001 certifiaction (04/26/2002) [Intellectual property] Method and device for generating exciting rush current waveform of three-phase AC transformers (Patent #4275178), transformer excitation rush current suppresion control method and device (Patent #4562747), transformer excitation rush current suppression control method and device (Patent #5050254), excitation rush current suppression type transformer (Patent #5343118) [Major facilities and equipment] Electrical CAD system, imitation power supply test device, all kinds of software development environments, NC turret punch press, bending press, powder coating system