Self-powdered protection device for power transmission and distribution lines
A technology of power transmission and distribution lines and protection devices, which is applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problems of high cost, large size, low-cost full digital power supply protection devices, etc., and achieve high-efficiency full digital protection , Ease of use, low power mode operation effect
Active Publication Date: 2012-08-29
BEIJING QINGCHANG POWER TECH CO LTD
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Problems solved by technology
[0002] Traditional microcomputer protection devices usually work only when there is power supply. For this reason, the power distribution cabinet needs to be equipped with PT, power module, DC screen and other units to provide voltage source, which is costly and bulky
The protection device cannot provide power supply protection for the power supply line in the application where there is no external power cabinet and the voltage source cannot be obtained
Self-powered, low-cost, high-integrated, intelligent all-digital power supply protection device has not yet been seen
Method used
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[0022] Reference figure 1 The self-powered protection device for power transmission and distribution lines of the present invention is composed of a CT AC current source installed on a power grid circuit, a first power module 11, a second power module 22, a CPU module 3 and a trip device 4.
[0023] The first power supply module 1 includes a clamping, rectification, and PWM management module 11 and an isolation, transformation, and rectification module 12. The second power supply module 22 includes a wide-range PWM mode switching power supply module 21, a voltage conversion energy storage unit 22, an electric pulse control unit 23, a power detection unit 24 and a power management unit 25. The CT AC current source is connected to the clamp, rectifier, and PWM management module 11, the wide-range PWM mode switching power supply module 21, the voltage conversion energy storage unit 22, the electric pulse control unit 23 and the trip device 4 in turn, and the CPU module 3 is connected...
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The invention provides a self-powdered protection device for power transmission and distribution lines, comprising a CT (Cable Tray) AC current source, a clamp, a rectification module, a PWM (Pulse Width Modulation) management module, a wide-range PMW mode switch power supply module, a voltage conversion energy storage unit, an electric pulse control unit, a CPU (Central Processing Unit) module and a tripping device, wherein the CT AC current source is sequentially connected with the clamp, the rectification module, the PWM management module, the wide-range PMW mode switch power supply module, the voltage conversion energy storage unit, the electric pulse control unit and the tripping device, and the CPU module is respectively connected with a power detection unit and the electric pulse control unit and controls the voltage conversion energy storage unit to release stored electric energy to the tripping device. The self-powdered protection device for the power transmission and distribution lines has the advantages that extraction and conversion of CT AC electric energy are realized, when in protection action, a CPU controls the stored energy to be released to the tripping device in a pulse mode so that the tripping device is in tripping action, thereby the supply of all digital power supply protection with low cost and high efficiency to the power transmission and distributionlines in an application place without a power supply cabinet is realized.
Description
Technical field [0001] The invention relates to a protection device for power transmission and distribution lines, in particular to a self-powered protection device for power transmission and distribution lines. Background technique [0002] Traditional microcomputer protection devices usually work only when there is a power supply. For this reason, the power distribution cabinet needs to be equipped with PT, power supply modules, DC screens and other units to provide voltage sources, which are costly and bulky. The protection device cannot provide power supply protection of the power supply line when the voltage source cannot be obtained in the application where there is no external power cabinet. Self-powered, low-cost, highly integrated, and intelligent fully digital power supply protection devices have not yet been seen. Summary of the invention [0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a self-powered protection ...
Claims
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IPC IPC(8): H02J13/00H02H7/26
CPCY04S10/20Y02E60/725Y02E60/00
Inventor 何永波张焕粉宫保华
Owner BEIJING QINGCHANG POWER TECH CO LTD