Double-DSP (digital signal processor) single-phase grounding arc extinction equipment of power system

Abstract

The invention discloses double-DSP (digital signal processor) single-phase grounding arc extinction equipment of a power system. The double-DSP single-phase grounding arc extinction equipment comprises a current and voltage transformer signal acquisition circuit, a first DSP, an arc grounding processing device, a voltage transformer protecting device, a multi-way switch state information acquisition circuit and a second DSP. The current and voltage transformer signal acquisition circuit is used for receiving current and voltage state information of the power system; the first DSP is used for receiving the current and voltage state information of the power system and processing the signals in real time; the arc grounding processing device is used for carrying out arc extinction processing operation on single-phase arc grounding failures of circuits, and the voltage transformer protecting device is used for eliminating resonance so as to protect voltage transformers; the multi-way switch state information acquisition circuit is used for acquiring switch state information of the arc grounding processing device and switch state information of the voltage transformer protecting device; the second DSP is used for acquiring switch state information of the system and outputting control signals; data can be exchanged between the first DSP and the second DSP via a data exchange interface. The double-DSP single-phase grounding arc extinction equipment has the advantage that shortcomings of existing arc extinction coils and arc extinction cabinets can be overcome by the aid of the double-DSP single-phase grounding arc extinction equipment.

Description

technical field [0001] The invention relates to a dual-DSP single-phase grounding arc suppression equipment for a power system, and belongs to the technical field of production and manufacturing of power grid operation safety control equipment. Background technique [0002] Domestic protection products for arc ground faults mainly include arc suppression coils and arc suppression cabinets. The defect of the arc suppressing coil is: the arc suppressing coil compensates the power frequency capacitive current, but the actual current passing through the grounding point not only has the power frequency capacitive current, but also includes a large amount of high frequency current and resistive current. In severe cases, only the high frequency The current and resistive current can maintain the continuous burning of the arc, and cannot completely extinguish the arc; the existence of the arc suppression coil sometimes causes an abnormal increase in the neutral point displacement vol...

AI Technical Summary

Problems solved by technology

The defect of the arc suppressing coil is: the arc suppressing coil compensates the power frequency capacitive current, but the actual current passing through the grounding point not only has the power frequency capacitive current, but also includes a large amount of high frequency current and resistive current. In severe cases, only the high frequency The current and resistive current can maintain the continuous burning of the arc, and cannot completely extinguish the arc; the existence of the arc suppression coil sometimes causes an abnormal increase in the neutral point displacement voltage, increases the asymmetry of the three-phase voltage, and affects the power grid. The single-phase load and equipment insulation have adverse effects, and sometimes even report the bus grounding signal, which affects the safe operation of the power grid, so that some arc suppression coils cannot be put into operation for a long time, resulting in great waste; The line technology is more difficult, and the accuracy of grounding line selection is low

The defect of the arc suppression cabinet is: because the restoration of its protective action is the restoration of metallic grounding, the line capacitance of the two non-faulted phases is in a discharging state, while the faulty phase is in a charging state, and a large voltage disturbance occurs in the three-phase system , it is very easy to stimulate the nonlinear inductance components in the system to cause resonance, and burning out the voltage transformer or its fuse is a shortcoming that it is difficult to overcome; the controller of the arc suppression device judges the arc performance through the three-phase voltage and the opening voltage Overvoltage, the criterion is simple, and it is very easy to make mistakes. If the protection action switches to the wrong phase, or other phases are grounded after the protection action, it will cause a short circuit between phases and cause greater harm to the power system. It does not meet the requirements of power system protection. Device Security Requirements

Images