Grid fault measuring and control device
A technology of measurement and control device and power grid fault, applied in circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc. Achieve the effect of real-time operation guarantee, clear running state and compact structure
Inactive Publication Date: 2013-04-24
SHANGHAI HEKAI ELECTRICAL TECH
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Problems solved by technology
The power grid fault measurement and control device in the prior art is relatively simple, cannot analyze the power grid fault, and the speed of eliminating faults is slow, and cannot realize functions such as remote intelligent control, liquid crystal display and data protection
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[0015] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.
[0016] Such as figure 1 As shown, the power grid fault measurement and control device includes a signal input terminal and a signal acquisition and processing module electrically connected to the rear side of the signal input terminal. The signal input terminal includes two small current signal inputs, a three-phase voltage, an open voltage, a ground current and a switch The two small current inputs are respectively connected to the first single-chip microcomputer and the second single-chip microcomputer through the signal acquisition and processing module, and the three-phase voltage, open voltage, ground current and switch input are respectively connected to the third single-chip microcomputer through the signal acquisition and processing modul...
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The invention provides a grid fault measuring and control device and relates to the technical field of circuit protection. The grid fault measuring and control device is characterized by comprising a signal input end, a signal collecting and processing module, a first singlechip, a second singlechip, a third singlechip, and a fourth singlechip, wherein the signal collecting and processing module is connected with the back side of the signal input side in an electric mode, the first singlechip, the second singlechip, the third singlechip, and the fourth singlechip are connected with the back side of the signal collecting and processing module, and the fourth singlechip is connected with a controlling keyboard module, a 485 communication transmission module, a memory module, a liquid crystal display (LCD) module and an indicator light module. The grid fault measuring and control device is modularized in design, compact in structure, advanced in technology, and capable of guaranteeing instantaneity and accuracy of calculating through a high-speed digital signal processor (DSP) nuclear processor. A multi-master controller area network (CAN) bus communication with the functions of self error correction and self arbitration is adopted among all modules, mass data is exchanged and shared, and the grid fault measuring and control device has the function of fault remembering. Liquid crystal display in Chinese is achieved, and the grid fault measuring and control device is clear in running status, capable of operating in menu-type , and convenient and easy to use.
Description
Technical field: [0001] The invention relates to the technical field of circuit protection, in particular to a power grid fault measurement and control device. Background technique: [0002] In a three-phase four-wire circuit, the phasor sum of the three-phase current is equal to zero, that is, Ia+Ib+IC=0. If a current transformer is connected in the three-phase four-wire, the induced current is zero at this time. When an electric shock or leakage fault occurs in the circuit, there is a leakage current flowing in the circuit. At this time, the phasor sum of the three-phase current passing through the zero-sequence current transformer is not equal to zero, and the phasor sum is: Ia+Ib+Ic= I (leakage current). The sent signal identifies the type and phase of the fault, accurately judges the fault area and fault line, and sends out a control command or an alarm signal. The grid fault measurement and control device in the prior art is relatively simple, cannot analyze the fau...
Claims
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IPC IPC(8): H02H7/28H02H3/04
Inventor 郭耀华
Owner SHANGHAI HEKAI ELECTRICAL TECH