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Relay protection method of power system

A relay protection and power system technology, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, electrical components, etc., can solve problems such as program upgrades, difficult maintenance, high requirements for protection action speed, and complex software

Inactive Publication Date: 2008-07-16
刘雁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the high-voltage line protection requires a large amount of calculation and requires high protection action speed. The single-CPU microcomputer protection used today is difficult to meet the requirements.
Today's microcomputer protection has the function of sending action reports, fixed values ​​or other information to remote places, but users have different requirements for communication media and protocols, which complicates the design of protection
There are many protection functions for high-voltage lines, and the software is very complicated. The existing protection has not adopted excellent programming ideas and technologies, and it is very difficult to upgrade and maintain the program

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The input signal of this method has two kinds of analog signal and switch signal. The analog input signals of this method include: three-phase voltage, three-phase current, synchronous voltage and zero-sequence current. The switching value includes the position of the line circuit breaker and the protection pressure plate, etc.

[0010] After the analog quantity is filtered, it is input to the A / D chip, which is regularly collected by the DSP chip. After calculation, the calculated result is placed in the dual-port RAM chip and read by the CPU chip.

[0011] The CPU reads the analog quantity rest of the protected device from the dual-port RAM chip, and after judgment, makes a conclusion of tripping or alarming, and then opens the circuit.

[0012] The report and disturbance data generated by the CPU are sent to the outside world through the communication port, and the fixed value and other information from the outside world are accepted.

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PUM

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Abstract

The invention provides an electric power system delay protection method, which comprises a signal sampling and conditioning circuit, a calculating and comparing circuit, a memory, a communication circuit and an output circuit. The calculating and comparing circuit consists of a DSP chip TMS320C32 and a 32 digit MPU microprocessor chip MC68332 which are connected with each other through a double-port RAM. One set of data wire, address wire, chip-select line and interrupt signal line of the double-port RAM are connected to a signal wire corresponding to the MC68332, the other set of data wire, address wire, chip-select line and interrupt signal line of the double-port RAM are connected with a DSP. The invention can provide fast, reliable, safe and sensitive protection for transmission lines of a high-voltage electric power system and an ultra-high voltage electric power system.

Description

technical field [0001] The invention relates to a relay protection method for power system transmission lines, and is a microcomputer protection method for high-voltage / ultra-high-voltage transmission lines. The invention belongs to the technical field of electric power system relay protection. Background technique [0002] The relay protection of high-voltage transmission lines is a difficult point in the field of relay protection. Although there are many high-voltage line protection products in the market, there are still some problems that have not been well resolved. For example, the high-voltage line protection requires a large amount of calculations and requires high protection action speed. The current microcomputer protection with a single CPU structure is difficult to meet the requirements. Today's microcomputer protection has the function of sending action reports, fixed values ​​or other information to remote places, but users have different requirements for com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22H02H7/26H02H3/26
Inventor 刘雁
Owner 刘雁
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