Uninterruptible power supply intelligent overvoltage protection device

A protection device, overvoltage technology, applied in the direction of emergency protection circuit device, emergency protection circuit device, circuit device for limiting overcurrent/overvoltage, etc., can solve the malfunction of relay protection device, damage to electrical equipment, traction high power problems

Pending Publication Date: 2019-04-12
潘政强
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 3. The electric arc furnace is overvoltage, and the scrap steel in the electric arc furnace will often collapse and collide with the electrodes to cause a short circuit. Therefore, the current in the system will fluctuate repeatedly and irregularly, resulting in a large load impact and severe distortion of the current waveform.
Moreover, the traction power required by locomotives is increasing, and the impact and voltage fluctuations are also more serious.
And because the traction power supply system itself is a three-phase asymmetrical load, and the electric locomotive is a moving single-phase rectification belt impact load, a large amount of harmonics, negative sequence and reactive power are generated, which are injected into the power system, resulting in a decline in the power quality of the power system. In severe cases, it can lead to accidents such as relay protection device misoperation, system

Method used

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  • Uninterruptible power supply intelligent overvoltage protection device

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Embodiment Construction

[0016] Such as figure 1 Shown: an intelligent overvoltage protection device for uninterrupted power supply, including high voltage switch QF, transformer TK, rectifier diode D1, rectifier diode D2, current limiting resistor R1, AC capacitor C1, super capacitor C, DC contactor KM1, programmable Program controller PLC, DC contactor KM2, discharge resistor R2, voltage transmitter XT; the primary winding of the transformer TK is connected to the power grid through the high-voltage switch QF; Diode D2; rectifier diode D1, the negative terminal of rectifier diode D2 is connected in parallel and then connected to current limiting resistor R1; the contacts of DC contactor KM1 are connected to both ends of current limiting resistor R1 in parallel; the other end of current limiting resistor R1 is connected to supercapacitor C; The negative terminal of the capacitor C is connected to the center tap of the secondary winding of the transformer TK; the AC capacitor C1 is connected to both e...

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Abstract

The invention discloses an uninterruptible power supply intelligent overvoltage protection device, and belongs to the technical field of power electronics. Overvoltage energy is absorbed by a supercapacitor C through a transformer TK and a diode D, and an auxiliary control circuit is adopted in a matched mode. The overvoltage protection device can be installed on a power supply bus and is used foreliminating lightning stroke overvoltage and internal overvoltage of a high-voltage power grid in various working conditions so as to achieve the effects of stabilizing the power grid, protecting theequipment, improving the reliability of the system and the like.

Description

technical field [0001] The invention relates to an intelligent overvoltage protection device for uninterrupted power supply, which belongs to the technical field of power electronics. It is used to eliminate lightning overvoltage and internal overvoltage of medium and high voltage power grids under various working conditions, so as to achieve the effects of stabilizing the power grid, protecting equipment, and enhancing system reliability. Background technique [0002] With the growth of the economy, the power system is also developing rapidly. The installed capacity is getting bigger and bigger, the grid voltage is getting higher and higher, and the coverage area is getting wider and wider. There are more and more large-scale impact loads and nonlinear loads in the grid. Overvoltage often occurs in the power grid, which seriously affects the safe and stable operation of the power system. Overvoltage mainly occurs in several aspects. [0003] 1. Vacuum circuit breaker open...

Claims

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Application Information

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IPC IPC(8): H02H9/04
CPCH02H9/04
Inventor 潘政强
Owner 潘政强
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