Wire microcomputer protection device based inrush discrimination technology

A microcomputer protection device and identification technology, which is applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as unreliable protection of medium and low voltage lines, achieve great social benefits, improve the correct rate of protection actions, and ensure quickness. Effect

CN102185294BActive Publication Date: 2013-11-13STATE GRID CORP OF CHINA +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2013-11-13

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Abstract

The invention discloses a wire microcomputer protection device based on an inrush discrimination technology. A current-loaded current transformer of a charging line is connected with an alternating current sampling module; the alternating current sampling module and a power module are both in bi-directional connection with a CPU (central processing unit) management module; the CPU management module is respectively in bi-directional connection with an input / output module and a man-machine interaction module; a CPU protection module comprises an A / D analog-to-digital conversion module and a digital signal processing module; and the CPU management module is connected with the A / D analog-to-digital conversion module and the digital signal processing module in sequence. The device can obviously improve the accuracy rate of wire protection operation and the power supply reliability of medium-low-voltage networks.
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Description

technical field

[0001] The invention relates to a line microcomputer protection device using surge current identification technology. Background technique

[0002] At present, there are a large number of distribution transformers installed on medium and low voltage lines. At the moment of switching on, the excitation inrush currents generated by each transformer are superimposed on the line and reflected back and forth, resulting in a complex electromagnetic transient process. When the system impedance is small, it will The larger inrush current occurs, the time constant is also larger. For the current quick-break protection in the two-stage current protection, due to the need to take into account the sensitivity, the operating current value is often made smaller, especially when the line is long or the system impedance is large. The excitation inrush current value may be greater than the device setting value, causing the protection to malfunction. This situation is not pr...

Examples

Embodiment Construction

[0011] exist figure 1 Among them, the present invention is a line microcomputer protection device using inrush current identification technology, which includes a power supply module, a management CPU module, a protection CPU module, an AC sampling module, an input and output module, and a man-machine dialogue module. The transformer is connected to the AC sampling module, the AC sampling module and the power supply module are bidirectionally connected to the management CPU module, the management CPU module is bidirectionally connected to the input and output module and the man-machine dialogue module, and the protection CPU module includes the A / D module Digital conversion module and digital signal processing module, the digital signal processing module is set as a DSP digital signal processing module, the management CPU module is connected with the A / D analog-to-digital conversion and digital signal processing module in turn, and the AC sampling module collects the current mu...