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Low voltage digital relay

A digital relay and relay technology, applied in digital variable display, instruments, circuits, etc., can solve the problems of low-voltage components such as poor performance, lack of intelligence, and single function, and achieve the effect of short-circuit quick disconnection, volume saving, and strong comprehensive measurement

Inactive Publication Date: 2004-03-03
刘曙光 +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Traditional low-voltage components mostly adopt electromechanical structure. The low-voltage components of this structure have poor performance, large volume, high cost, single function, and no intelligence.

Method used

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  • Low voltage digital relay
  • Low voltage digital relay
  • Low voltage digital relay

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] see figure 1 , The low-voltage digital relay includes AC sampling circuit 1, microprocessor 2, relay circuit 3, display drive circuit 4, power-down protection and hardware watchdog circuit 5, serial communication interface circuit 6, key setting circuit 7, switch input Circuit 8, indicating circuit 9 nine parts. The input terminals of the microprocessor 2 respectively receive signals from the AC sampling circuit 1, the power-down protection and hardware watchdog circuit 5, the serial communication circuit 6, and the switching value input circuit 8; the output terminals of the microprocessor 2 respectively control the relay circuit 3. Display driving circuit 4, button setting circuit 7, and indicating circuit 9. The AC sampling circuit 1 is composed of three-phase voltage transformers H4, H5, H6, three-phase current transformers H1, H2, H3, A / D ...

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Abstract

The invented relay integrated with measuring, protection, communication, controlling and monitoring functions includes sampling circuit, microprocessor, relaying protection circuit, display drive circuit, RS-485 bus communication interface, power down protection circuit and key set circuit. The invention possessing powerful synthetical measuring and displaying functions can show electrical parameters such as three phase currents and voltages, total power factor, total reactive power and active power and frequency as well as indicate on / off or fault status of breaker. Operating faceplate can setup CT ratio, display first current and voltage of incoming line. Setting each protection parameters can realize short circuit fast breaking, over voltage and lower voltage alarm. The invented device can also replace traditional current meter, voltage meter, frequency meter, power factor meter and reactive / active meter etc.

Description

technical field [0001] The invention relates to a low-voltage digital relay for automatic application in a substation incoming line cabinet or other low-voltage switch cabinets and low-voltage power distribution systems that need to display various power parameters. Background technique [0002] In the low-voltage power system, it involves basic requirements such as measurement, metering, and relay protection. Traditional low-voltage components mostly adopt an electromechanical structure. The low-voltage components of this structure have poor performance, large volume, high cost, single function, and no intelligence. With the rapid development of microelectronics technology, computer technology, and network technology and their wide application in low-voltage power systems, the development of various intelligent low-voltage components has become possible and is developing rapidly. Contents of the invention [0003] The purpose of this invention is to provide a low-voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R13/02G01R19/00G01R21/00H01H9/16H01H71/04H02H3/00H02H3/04H02H3/08
Inventor 刘曙光姜雪明
Owner 刘曙光
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