By taking the self-healing type low voltage power capacitor as the main body and the intelligent measuring and controlling processor as the control center, the HY series intelligent combination type low voltage power capacitor (hereinafter referred to as combination capacitor) adopts microelectronic software and hardware technologies to realize zero-crossing control of thyristor, achieve time delay switching of contact of the mechanical type magnetic latching relay and accomplish zero-crossing switching technology of the low voltage power capacitor by mechanical type magnetic latching relay and thyristor combination switch circuit, and thus, power factor compensation is carried out in 0.4KV low voltage line. The product integrates sensing technology, network technology and the latest independent research and development results of electric technology to make the combination intelligent, small-sized and networked. Compared with traditional low voltage reactive compensation products, it has such features as automatically cycled switching; three-phase compensation, split-phase compensation, mixed compensation, optimized grading compensation, mixed optimized grading compensation; protection for over-current / over-voltage / under-voltage / under-current, voltage loss, phase loss, harmonic wave and temperature; and other functions such as measurement, control, communication and etc.
With the breakthrough in the structure of the existing low voltage reactive compensation devices, the product can realize a new mode of dispersed control and centralized management. The compensation system is featured by few parts, low temperature rise, small volume, low power consumption, harmonic resistance; simple structure, easy realization of standardization and normalization, flexible capacity configuration, good safety and reliability, cost saving, convenient use and etc.