The main functions of the DC power supply within the high-voltage room are:
1. It provides power to the closing mechanism of the high-voltage switch. For example, electromagnetic (CD) closing mechanisms require high DC currents, while spring-charged (CT) closing mechanisms do not, requiring only sufficient voltage for the normal operation of the energy storage motor. It also provides DC power to the DC busbars on top of the high-voltage switch for signal, control, and alarm circuits, as well as to certain relay protection and automatic devices. The DC power supply serves as an operating power source and signal display alarm, providing power for the automatic or motorized operation of large and complex high- and low-voltage (high voltage is more common) distribution systems. It can also be integrated with the central signal panel. (For details, please refer to national and industry standards.)
2. The DC panel consists of: AC power supply, rectifier, charger (current and voltage stabilizer), battery pack, DC distribution voltage level, and battery quantity: a 110V DC system requires 9 12V batteries, and a 220V DC system requires 18 12V batteries.
3. There are two types of simple DC operating power supplies: the HDP embedded distributed DC system, consisting of a main unit and a battery box, requiring only two 12V batteries; and the integrated HMP, UP5, and DUP micro DC operating power supplies, where the battery and main unit are housed in a single chassis. Four DC voltage options are available for different power consumption devices: 24V, 48V, 110V, and 220V.
4. High-voltage switchgear refers to electrical products used for switching, control, and protection in power generation, transmission, distribution, conversion, and consumption. They operate in voltage levels ranging from 3.6V to 550kV and primarily include high-voltage circuit breakers, high-voltage disconnectors and earthing switches, high-voltage load switches, high-voltage automatic reclosers and sectionalizers, high-voltage operating mechanisms, high-voltage riot-proof distribution equipment and switchgear, instrumentation, European-style and American-style box-type transformers. For example, a high-voltage switch trips during a power substation accident, disrupting the incoming power. But we still want electrical devices for alarms and diagnostics. So where does the power for these instruments and control devices come from? It depends on a DC panel, which contains a battery.
5. DC panels are used in large, medium, and small power plants and substations, providing DC power for high-voltage switchgear during normal operation and emergency conditions, relay protection, automatic control, emergency lighting, and other functions. The reliability of DC panels is unmatched by other power supply devices, meeting the high reliability requirements of substations and power plants. A transformer is an electrical device used for electrical energy conversion. It converts AC energy of one voltage and current into AC energy of another voltage and current of the same frequency. Transformers are used in almost all electronic products. Their principle is simple, but the winding process requirements vary depending on the application. Transformers’ main functions include voltage conversion, impedance conversion, isolation, and voltage stabilization (magnetic saturation transformers). Common core shapes for transformers are E-type and C-type.
Post time: Sep-17-2025
