project introduction：[Technical Introduction] This project mainly developed a DSP-based digital 10kV capacitor bank synchronous switching device. The hardware of the device takes the DSP chip as the core, uses vacuum type permanent magnet circuit breakers, and is independently programmed and controlled. It is suitable for switching capacitor banks of various voltage levels from 380v to 10kV, and the control of various wiring methods can be flexibly set.

[Technical Characteristics] This project adopts synchronous (phase-selective control) technology to switch large-capacity capacitor banks, which can effectively suppress the transient impact caused by switching large-capacity capacitor banks, extend the service life of the capacitor banks, and ensure the stability of the power grid system. operation.

The main feature of controlling the synchronous switch of the capacitor is to make the contacts of the mechanical switch accurately close or open at the required moment, that is, close at the moment when the voltage at both ends of the switch contacts is zero, so as to realize the non-inrush current input of the capacitor and the current is zero. Disconnect at the moment, thereby realizing arc-free breaking of the switch contacts.

Compared with commonly used composite switches, synchronous switches omit the thyristor components connected in parallel with the magnetic holding relay contacts, so the structure is simplified, the cost is reduced, and the faults prone to thyristor components are avoided, so the reliability is greatly improved.

[Technical level] It can accurately control the synchronous switching and removal of contacts, and can frequently and accurately switch large-capacity capacitor banks through zero-crossing, which ideally solves the problems of closing inrush current and operating overvoltage when switching capacitor banks, and greatly improves the switching. The service life of the capacitor banks improves the reliability of the operation of the entire power grid system, is of great significance to the safe and stable operation of the transmission and distribution system, and fills the gap in domestic technology.

[Patent status] 2 patents have been obtained

[Technical status] Small batch production stage

[Cooperation Method] Product upgrade, sales promotion

Application situation or application prospects：[Applicable fields and scope] Medium-voltage (10KV) dynamic reactive power compensation devices are widely used in 10kV ~ 220kV substations in power system, steel, metallurgy, coal mining, chemical industry, machinery and other industries. They are installed on the 6kV and 10kV buses of the substation. They are used for power systems and industrial users to stabilize the bus voltage, improve power factor, improve power quality, reduce network losses, and save power.

[Expected benefits] The medium voltage intelligent dynamic reactive power compensation switching device is a professional product developed in response to market demand with efficient power and energy conservation. The industry has urgent market demand and large market capacity. The project is in line with the national "Twelfth Five-Year Plan" development outline and the development direction of green and low-carbon industries advocated by the state. It is within the scope of strong support from the national industrial policy and has considerable development prospects. After the project is implemented, it can be rapidly industrialized and form a new profit growth point.