CN104953565B - Line interphase fault relay protection method is surveyed based on transition resistance - Google Patents
Line interphase fault relay protection method is surveyed based on transition resistance Download PDFInfo
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Abstract
本发明公开了一种基于过渡电阻实测线路相间故障继电保护方法。本发明首先测量输电线路两端的故障相间电压和故障相间电流，计算输电线路有功交换功率和输电线路消耗有功功率，利用输电线路有功交换功率减去输电线路消耗有功功率得到输电线路相间短路故障点过渡电阻消耗的有功功率，根据输电线路相间短路故障点过渡电阻消耗的有功功率等于过渡电阻与输电线路两端故障相间电流矢量和的绝对值平方的乘积这一物理特性计算输电线路相间短路故障点的过渡电阻，然后判断输电线路相间短路故障点的过渡电阻大于50欧姆是否成立。本发明方法算法模型中不需要用到系统阻抗参数，动作性能不受系统运行方式的影响。
The invention discloses a relay protection method for phase-to-phase faults of lines based on transition resistance actual measurement. The present invention firstly measures the fault phase-to-phase voltage and fault phase-to-phase current at both ends of the transmission line, calculates the active exchange power of the transmission line and the active power consumed by the transmission line, and uses the active exchange power of the transmission line to subtract the active power consumed by the transmission line to obtain the short-circuit fault point transition between phases of the transmission line The active power consumed by the resistance is calculated according to the physical characteristic that the active power consumed by the transition resistance of the phase-to-phase short-circuit fault point of the transmission line is equal to the product of the transition resistance and the square of the absolute value of the vector sum of the fault-phase currents at both ends of the transmission line. Transition resistance, and then determine whether the transition resistance of the phase-to-phase short-circuit fault point of the transmission line is greater than 50 ohms. The algorithm model of the method of the present invention does not need to use system impedance parameters, and the action performance is not affected by the operating mode of the system.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, concretely relate to a kind of based on transition resistance actual measurement
Line interphase fault relay protection method.
Background technique
Relay protection is as the first line of defence for ensureing power network safety operation, and accurate quick acting is to isolated fault
It is most important with preventing accident from spreading.Traditional back-up protection is constituted based on local electrical quantities, need to be carried out by offline pre-set value
Cooperation, to guarantee the selectivity of protection act.Outstanding problem existing for the mode is that protection seting is complicated, action delay is long,
It is difficult to meet the safety and stability requirement of modern complex electric network.In a wide range of power flow transfer, remote back-up protection is easy chain
Malfunction, and then accelerate mains breakdown.
In recent years, with the development of wide area measurement technology and its in the popularization and application of China Power Grids, China Power Grids are all
500kV and above substation and the power plant 60MW are assembled with synchronous phasor measurement unit (phase
Measurement unit, PMU), there are also installed PMU for some important load-center substations 330kV, 220kV, therefore, based on wide
The research of domain information electric network protection has received widespread attention.Wherein, the transmission line malfunction relay protection based on Wide-area Measurement Information is calculated
Method is the core component based on Wide-area Measurement Information electric network protection.Wang Hua, Zhang Zhe and Yin Xianggen et al. are delivered " electric based on failure
Press the wide area backup protection algorithm of distribution " it is modeled using lumped parameter, utilize the measurement of route side voltage, current failure component
The voltage failure component of the value estimation other side, is constituted line protection criterion with the ratio of estimated value and measured value.This method
Participating in the electrical quantity calculated is fault component, is only applicable to the relay protection after transmission line malfunction in two cycles；This method is dynamic
It is serious by transition Resistance Influence to make performance, when transition resistance is larger, protects the case where will appear tripping, it can not be in time by fault wire
Road is isolated with power grid；This method because with system impedance relating to parameters, influenced by system operation mode in principle.
Summary of the invention
It is an object of the invention to overcome deficiency existing for prior art, propose that a kind of accurately to measure transmission line of electricity alternate
Short circuit trouble point transition resistance, the route that action performance is not influenced by transition resistance, load current and system operation mode are alternate
Failure relay protecting method.
Line interphase fault relay protection method is surveyed based on transition resistance, which is characterized in that including following sequential steps:
(1) failure voltage between phases of the protector measuring transmission line of electricity in m transforming plant protecting installation placeWith failure phase
Between electric currentTransmission line of electricity is measured in the failure voltage between phases of n transforming plant protecting installation placeWith failure three-phase currentWherein, φ φ=AB, BC, CA phase；
(2) the active exchange power of protective device computing electric power line
(3) protective device computing electric power line consumes active powerWherein, z1It is defeated for unit length
Electric line positive sequence impedance；L is transmission line length；φ φ=AB, BC, CA phase；
(4) transition resistance of protective device computing electric power line phase fault pointJudgement
The transition resistance R of electric transmission line phase fault pointfIt is whether true greater than 50 ohm, that is, judgeIt is
No establishment, if so, then judge that alternate high resistant short trouble, protective device sending movement tripping letter occur for φ φ phase transmission line of electricity
Number, the breaker at tripping three phase line both ends；Wherein, φ φ=AB, BC, CA phase.
The features of the present invention and technological achievement:
The method of the present invention measures the failure voltage between phases and failure three-phase current at transmission line of electricity both ends first, calculates power transmission line
The active exchange power in road and transmission line of electricity consume active power, subtract transmission line of electricity using the active exchange power of transmission line of electricity and consume
Active power obtains the active power of electric transmission line phase fault point transition resistance consumption, according to transmission line of electricity phase fault
The active power of fault point transition resistance consumption is equal to the exhausted of transition resistance and transmission line of electricity both ends failure three-phase current vector sum
To the transition resistance of this physical characteristic computing electric power line phase fault point of the product of value square, power transmission line is then judged
Whether the transition resistance of road phase fault point is true greater than 50 ohm, if so, then judge that alternate height occurs for transmission line of electricity
Short trouble is hindered, action trip signal is issued.It does not need to use system impedance parameter, action in the method for the present invention algorithm model
It can not be influenced by system operation mode.The transition electricity of the accurate computing electric power line phase fault point of the method for the present invention energy
Resistance, it is former using the transition resistance and adjusting 50 ohm of composition relay protection criterions of threshold value of electric transmission line phase fault point
The influence of transition resistance and load current to Perfomance of protective relaying is eliminated in reason, and there is very strong tolerance transition resistance and is resisted negative
The ability that charged current influences.
Detailed description of the invention
Fig. 1 is using multi-line power transmission system schematic of the invention.
Specific embodiment
Technical solution of the present invention is expressed in further detail below according to Figure of description.
Fig. 1 is using multi-line power transmission system schematic of the invention.CVT is voltage transformer in Fig. 1, CT is Current Mutual Inductance
Device.Failure voltage between phases of the protector measuring transmission line of electricity in m transforming plant protecting installation placeWith failure three-phase currentTransmission line of electricity is measured in the failure voltage between phases of n transforming plant protecting installation placeWith failure three-phase currentWherein,
φ φ=AB, BC, CA phase.
The active exchange power of protective device computing electric power line
Protective device computing electric power line consumes active powerWherein, z1For unit length power transmission line
Road positive sequence impedance；L is transmission line length.
Protective device computing electric power line phase fault point transition resistance RfThe active power Δ P-P of consumptionConsumption。
Electric transmission line phase fault point transition resistance RfThe active power Δ P-P of consumptionConsumptionEqual to transition resistance RfWith it is defeated
The squared absolute value of electric line both ends failure three-phase current vector sumProduct, therefore, protective device calculate it is defeated
The transition resistance of electric line phase fault point
Protective device judges the transition resistance R of electric transmission line phase fault pointfIt is whether true greater than 50 ohm, that is, sentence
It is disconnectedIt is whether true, if so, then judge that alternate high resistant short trouble occurs for φ φ phase transmission line of electricity, protects
Protection unit issues action trip signal, the breaker at tripping three phase line both ends；Wherein, φ φ=AB, BC, CA phase.
The method of the present invention measures the failure voltage between phases and failure three-phase current at transmission line of electricity both ends first, calculates power transmission line
The active exchange power in road and transmission line of electricity consume active power, subtract transmission line of electricity using the active exchange power of transmission line of electricity and consume
Active power obtains the active power of electric transmission line phase fault point transition resistance consumption, according to transmission line of electricity phase fault
The active power of fault point transition resistance consumption is equal to the exhausted of transition resistance and transmission line of electricity both ends failure three-phase current vector sum
To the transition resistance of this physical characteristic computing electric power line phase fault point of the product of value square, power transmission line is then judged
Whether the transition resistance of road phase fault point is true greater than 50 ohm, if so, then judge that alternate height occurs for transmission line of electricity
Short trouble is hindered, action trip signal is issued.
It does not need to use system impedance parameter in the method for the present invention algorithm model, action performance is not by system operation mode
It influences.The transition resistance of the accurate computing electric power line phase fault point of the method for the present invention energy, it is alternate short using transmission line of electricity
The transition resistance of road fault point and adjusting 50 ohm of compositions relay protection criterions of threshold value eliminate transition resistance in principle and bear
Influence of the charged current to Perfomance of protective relaying, the ability influenced with very strong tolerance transition resistance and anti-load current.
The foregoing is merely preferred embodiments of the invention, but scope of protection of the present invention is not limited thereto, appoint
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all by what those familiar with the art
It is covered by the protection scope of the present invention.
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| CN105891669B (en) * | 2016-03-30 | 2019-01-25 | 国网福建省电力有限公司 | A single-phase-to-ground fault location method based on the actual measurement of transition resistance |
| CN108508326B (en) * | 2018-04-26 | 2020-03-17 | 西南交通大学 | Transmission line fault detection method based on positive sequence current fault component |
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| CN103166204B (en) * | 2013-01-31 | 2015-03-04 | 福建省电力有限公司 | Line inter-phase stoppage impedance distance protection method based on addition impedance actual measurement revision |
| CN103293433A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Transition resistance and load current influence resisting line inter-phase fault single-terminal location method |
| CN104332973A (en) * | 2014-11-12 | 2015-02-04 | 国家电网公司 | Line interphase short circuit fault relay protection method through fault active power |
| CN104360231A (en) * | 2014-11-12 | 2015-02-18 | 国家电网公司 | Line phase fault double-end distance measurement method based on fault active power |
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