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Adaptive distance III-segment protection method

A distance protection and self-adaptive technology, which is applied in the direction of emergency protection circuit devices, instruments, measuring devices, etc., can solve problems such as missed detection, overload misoperation, etc., and achieve the effect of preventing misoperation, fast protection speed, and ensuring normal operation

Active Publication Date: 2019-08-16
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides an adaptive distance protection method for stage III, which is used to solve the existing technical problem that using power angle to identify overload is prone to missing detection, resulting in low ability to prevent overload misoperation

Method used

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  • Adaptive distance III-segment protection method
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  • Adaptive distance III-segment protection method

Examples

Experimental program
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Embodiment 1

[0042] An adaptive distance III section protection method 100, such as figure 1 shown, including:

[0043] Step 110, obtaining line state information;

[0044] Step 120, based on the state information of the line, respectively calculate the logic output value R of the reactance line impedance relay, the overcurrent limiting relay, the ground fault relay and the adaptive impedance relay based on the current constraint and the voltage constraint of the line 1 , R Imax , R 0 and R 2 ;

[0045] Step 130, based on R 1 , R Imax , R 0 and R 2 , calculate the logical output value of the distance protection relay corresponding to the line, and complete the adaptive distance protection.

[0046] Because the load current of the line is determined by the impedance of the line and the voltage difference between the first and end voltages. Even if the potentials of each power supply in the power system are in the same phase, a large load current may be generated due to the modulus...

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Abstract

The invention discloses an adaptive distance III-segment protection method. The method comprises the steps of: employing voltage and current information measured at protection and mounting position toform voltage and current constraints to obtain an adaptive distance III-segment ball throwing circle motion characteristic changed along with the voltage of the side, and combining the adaptive distance III-segment ball throwing circle action characteristic with the motion characteristic of a conventional distance III segment to form a new adaptive impedance relay R2, wherein the adaptive impedance relay R2, a reactance line impedance relay R1, an over-current limiting relay RImax and an earth fault relay R0 commonly form motion criteria of interphase faults and earth faults of the distance protection III segment. The adaptive ball throwing circle characteristic is limited into the voltage and current constraints to ensure that the distance protection III segment is not operated by mistake when the circuit is overload, the distance protection III segment can be reliably opened when faults are generated in the region so as to ensure the high sensitivity, avoid the generation of the cascading trip phenomenon, and ensure the normal operation of the circuit.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, in particular to an adaptive distance III section protection method. Background technique [0002] When one or more lines in the power grid fail or trip without fault, the power flow transfer causes the load of the tripped line to be transferred to other lines, forming line overload. In recent years, there have been many large-scale blackout accidents at home and abroad, most of which were caused by the malfunction of the distance protection section III when the line was overloaded, which caused a chain reaction. Therefore, how to improve the distance protection section III or overload protection section and improve the ability to prevent abnormal overload and misoperation is a problem worthy of attention. [0003] The existing overload analysis methods generally start from the power angle, and believe that the cause of the overload is the increase of the power ang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/02G01R19/165
CPCH02H7/26G01R19/16571G01R19/16576G01R31/50
Inventor 陈卫陈德树曹文君
Owner HUAZHONG UNIV OF SCI & TECH
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