CN101701998A - Novel faulty line selection method in low current faulty grounding system - Google Patents
Novel faulty line selection method in low current faulty grounding system Download PDFInfo
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- CN101701998A CN101701998A CN200910230433A CN200910230433A CN101701998A CN 101701998 A CN101701998 A CN 101701998A CN 200910230433 A CN200910230433 A CN 200910230433A CN 200910230433 A CN200910230433 A CN 200910230433A CN 101701998 A CN101701998 A CN 101701998A
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Abstract
The invention discloses a novel faulty line selection method in a low current faulty grounding system, which judges whether a ground fault happens or not by detecting zero sequence voltage and phase voltage of a system bus, determines to judge grounded fault circuit adopting different faulty line selection methods according to the different characteristics of zero sequence fundamental wave and zero sequence quintuple harmonic current generated according to that arc suppression coil exists in a system when single-phase grounding fault happens on the premise that ground fault occurs, combines with some assistant line selection criteria to perform comprehensive judgment so as to select the circuit with a fault correctly, thus overcoming the problem of low accuracy of faulty line selection in a low current grounding system. The invention has the characteristics of reasonable method steps, high accuracy of faulty line selection and convenient operation and application.
Description
Technical field
The present invention relates to the fault-line selecting method in a kind of electric system of small current neutral grounding, belong to the application of Protection Technology.
Background technology
The node of generator or transformer Y-connection is called the neutral point of electric system.Small current neutral grounding system is meant the not directly grounded method of operation of the neutral point in the system.The not directly grounded method of operation mainly contains two kinds.A kind of mode wherein is isolated neutral (neutral point insulation); Another mode is meant neutral by arc extinction coil grounding or resistance grounded (non-effective earthing).Modal fault is a single-phase earthing in the small current neutral grounding system.Ground current was less when singlephase earth fault took place, and did not form short-circuit loop, and the supply voltage of this moment still can guarantee the symmetry of line voltage, so can continue to move 2 hours behind the safe operation of power system rules regulation generation singlephase earth fault.But the non-fault phase-to-ground voltage of total system maximum can be increased to phase voltage just often
Doubly,, fault is enlarged, so must in time find faulty line and excised if untimely processing very easily develops into line to line fault.
When in the small current neutral grounding system singlephase earth fault taking place, every have the circuit of electric capacity all will have zero-sequence current to flow through over the ground.But, very big dispersiveness is arranged again, so select ground path to have certain difficulty because zero-sequence current is less; If be connected to arc suppression coil in the system then correctly to select the ground path difficulty bigger.In traditional small current earthing wire-selecting mode, though the mode of the realization route selection of being adopted is a lot, but mostly only adopt single fault-line selecting method, can not the integrated information when earth fault takes place carry out fault distinguishing and reduced the accuracy that faulty line is selected, therefore have the low problem of failure line selection accuracy rate.
Summary of the invention
Have the low problem of failure line selection accuracy rate for solving in the prior art, the invention provides a kind of novel fault selection method in the small current neutral grounding system, its technical scheme of taking is:
This method may further comprise the steps:
(1) setting up procedure of failure line selection logic:
1. monitor residual voltage and phase voltage on the bus in real time, the instantaneous value of differentiating residual voltage when the instantaneous value of residual voltage surpasses the setting valve of residual voltage, carries out step differentiation 2. whether greater than the setting valve of residual voltage;
Whether the value of residual voltage variable quantity of 2. differentiating adjacent two cycles greater than the setting valve of residual voltage variable quantity, when the value of residual voltage variable quantity during greater than the setting valve of residual voltage variable quantity, carries out step differentiation 3.;
3. differentiate perfect phase magnitude of voltage whether greater than fixing threshold magnitude of voltage, when the magnitude of voltage that perfects phase during greater than fixing threshold magnitude of voltage, differentiating is earth fault and startup failure line selection logic;
(2) the failure line selection step when small current neutral grounding system is not connected to arc suppression coil:
1. monitor phase place and the amplitude that bus is taken the zero sequence fundamental current on the line out of in real time, all zero sequence fundamental currents carried out amplitude relatively, select the zero sequence fundamental current of three amplitude maximums, be designated as respectively by amplitude order from big to small:
2. three zero sequence fundamental currents selecting are carried out the phase bit comparison, select one of them direction of current and other two different zero sequence fundamental currents, then the circuit at this zero sequence fundamental current place is a faulty line;
3. in three zero sequence fundamental currents
Amplitude much larger than
Amplitude the time, if
Or
Phase place lag behind the phase place of residual voltage on the bus, then judge
Or
The circuit at place is a faulty line, otherwise judges that bus is a faulty line;
(3) the failure line selection step when small current neutral grounding system is connected to arc suppression coil:
1. monitor bus in real time and take the phase place and the amplitude of the zero sequence quintuple harmonics electric current on the line out of, all zero sequence quintuple harmonics electric currents are carried out amplitude relatively, select the zero sequence quintuple harmonics electric current of three amplitude maximums, be designated as respectively by amplitude order from big to small:
2. three zero sequence quintuple harmonics electric currents selecting are carried out the phase bit comparison, select one of them direction of current zero sequence quintuple harmonics electric current different with other two, then the circuit at this zero sequence quintuple harmonics electric current place is a faulty line;
3. in three zero sequence quintuple harmonics electric currents
Amplitude much larger than
Amplitude the time, if
With
Current opposite in direction, then judge
The circuit at place is a faulty line, otherwise judges that bus is a faulty line.
The setting valve of residual voltage is set at 20% of specified phase voltage amplitude in the described step (1), and fixedly the threshold magnitude of voltage is set at 1.1 times of specified phase voltage amplitude.
The present invention differentiates by residual voltage on the detection system bus and phase voltage whether earth fault takes place, if generation earth fault, in the system whether arc suppression coil is arranged during then according to the generation singlephase earth fault, thereby cause the different characteristics of zero sequence first-harmonic and zero sequence quintuple harmonics electric current, determine to adopt different fault-line selecting methods to judge the faulty line of ground connection, again in conjunction with some auxiliary route selection criterions, carry out comprehensive differentiation, thereby accurately select faulty line, overcome in the small current neutral grounding system problem that the failure line selection accuracy rate is low.
The present invention have method step rationally, failure line selection accuracy rate height, operational applications characteristics easily.
Description of drawings
Accompanying drawing 1 is a voltage starting logical diagram of the present invention;
Accompanying drawing 2 is based on the comprehensive route selection logical diagram of zero sequence fundamental current and assistant criteria among the present invention;
Accompanying drawing 3 is based on the comprehensive route selection logical diagram of zero sequence quintuple harmonics electric current and assistant criteria among the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described further:
Use this fault-line selecting method and at first need to gather residual voltage and phase voltage on each section bus, and this section bus with all outlets on zero-sequence current, more than the collection of numerical value in real time be to finish by the FBZ-3200 Small Electric Current Earthing And Routing Device of Shandong Taikai Automation Co., Ltd.'s development.Enter AD converter from the analog signals that CT (current transformer)/PT (voltage transformer (VT)) is imported of this device by filtering circuit, realize the collection of required each analog quantity with 24 sample frequency weekly.
This fault-line selecting method comprises following method step:
(1) startup of failure line selection logic:
What adopt in the startup of failure line selection logic as shown in Figure 1, is the voltage starting mode.Because in general electric substation, all be equipped with three-phase PT (voltage transformer (VT)) or special-purpose zero sequence PT (voltage transformer (VT)), so being the instantaneous value U0 that differentiates the residual voltage that detects in real time, the first step whether surpasses the setting valve U0zd that residual voltage starts, when real-time residual voltage U0 surpasses residual voltage setting valve U0zd, data before and after the record trouble then, carry out the detection of earth fault, residual voltage setting valve U0zd generally is set at 20% specified phase voltage amplitude.In order further to eliminate the influence of three-phase degree of asymmetry, second step was adopted the start-up criterion of the residual voltage variation delta U0 of adjacent two cycles as earthing wire-selecting, if the value of Δ U0, is then carried out the differentiation in the 3rd step greater than the setting valve Δ U0zd of residual voltage variable quantity.Because when singlephase earth fault takes place, can produce residual voltage U0 on the bus, and the fault phase voltage descends significantly and perfects phase voltage Ujq and significantly rise at this moment; When the PT disconnection fault takes place when, also can produce significant residual voltage U0, but perfect the voltage U jq of phase this moment and do not have tangible rising, in view of the above the 3rd the step will perfect the voltage U jq of phase and fixedly threshold voltage U zd compare, the threshold voltage value generally is set at the ratings of 1.1 times phase voltage, and whether just can differentiate generation earth fault greater than fixing threshold voltage U zd according to the voltage U jq that perfects phase like this still is generation PT disconnection fault.If above three criterions all satisfy then differentiate is earth fault and startup failure line selection logic.
(2) the failure line selection step when small current neutral grounding system is not connected to arc suppression coil:
As shown in Figure 2, when the quintuple harmonics discrimination function does not drop into, then adopt the comprehensive criterion based on zero sequence fundamental current and assistant criteria formation to carry out the selection of faulty line, concrete steps are:
1. monitor phase place and the amplitude that each section bus is taken the zero sequence fundamental current on the line out of in real time, all zero sequence fundamental currents on every section bus carried out amplitude relatively, select three amplitude maximums as the candidate.The zero sequence fundamental current of three amplitude maximums is designated as respectively by the order from big to small of amplitude:
2. on the basis of the zero sequence fundamental current of selecting three maximums, carry out the phase bit comparison, it is with other two different to select a zero sequence fundamental current direction, and the circuit at this zero sequence fundamental current place is exactly a faulty line;
If in three zero sequence fundamental currents 3. selecting in the above
Value much larger than
Value, then think
Too I is to ignore.Then utilize residual voltage this moment
With
Perhaps
The assistant criteria that phase relation constituted carry out faulty line and differentiate.This assistant criteria is: if
Perhaps
Lag behind
Then
Perhaps
Pairing line-to-ground, otherwise be bus-bar fault.
(3) the failure line selection step when small current neutral grounding system is connected to arc suppression coil:
As shown in Figure 3, when the quintuple harmonics discrimination function drops into, then adopt the comprehensive criterion that is constituted based on zero sequence quintuple harmonics electric current and assistant criteria to carry out the selection of faulty line, concrete steps are:
1. monitor each section bus in real time and take the phase place and the amplitude of the zero sequence quintuple harmonics electric current on the line out of, all zero sequence quintuple harmonics electric currents of every section bus are carried out amplitude relatively, select three amplitude maximums as the candidate.The harmonic current of three amplitude maximums is designated as respectively by the order from big to small of amplitude:
2. on the basis of the Zero-pharse harmonic electric current of selecting three maximums, carry out the phase bit comparison, select the harmonic current direction zero sequence quintuple harmonics electric current different with other two, the circuit at this zero sequence quintuple harmonics electric current place is exactly a faulty line;
If in three zero sequence quintuple harmonics electric currents 3. selecting in the above
Much larger than
Then think
Too I is to ignore.This moment is according to preceding two bigger zero sequence quintuple harmonics electric currents
With
Relative phase judge, if
With
Direction opposite, think that then amplitude is bigger
Corresponding circuit is a faulty line.If
With
Direction identical, then think bus-bar fault.
Claims (2)
1. a kind of novel fault selection method in the small current neutral grounding system is characterized in that comprising following method step:
(1) setting up procedure of failure line selection logic:
1. monitor residual voltage and phase voltage on the bus in real time, the instantaneous value of differentiating residual voltage when the instantaneous value of residual voltage surpasses the setting valve of residual voltage, carries out step differentiation 2. whether greater than the setting valve of residual voltage;
Whether the value of residual voltage variable quantity of 2. differentiating adjacent two cycles greater than the setting valve of residual voltage variable quantity, when the value of residual voltage variable quantity during greater than the setting valve of residual voltage variable quantity, carries out step differentiation 3.;
3. differentiate perfect phase magnitude of voltage whether greater than fixing threshold magnitude of voltage, when the magnitude of voltage that perfects phase during greater than fixing threshold magnitude of voltage, differentiating is earth fault and startup failure line selection logic;
(2) the failure line selection step when small current neutral grounding system is not connected to arc suppression coil:
1. monitor phase place and the amplitude that bus is taken the zero sequence fundamental current on the line out of in real time, all zero sequence fundamental currents are carried out amplitude relatively, select the zero sequence fundamental current of three amplitude maximums, be designated as respectively by amplitude order from big to small: i
10-1, i
1o-2, i
10-3
2. three zero sequence fundamental currents selecting are carried out the phase bit comparison, select one of them direction of current and other two different zero sequence fundamental currents, then the circuit at this zero sequence fundamental current place is a faulty line;
3. work as i in three zero sequence fundamental currents
10-2Amplitude much larger than i
10-3Amplitude the time, if i
10-1Or i
10-2Phase place lag behind the phase place of residual voltage on the bus, then judge i
10-1Or i
10-2The circuit at place is a faulty line, otherwise judges that bus is a faulty line;
(3) the failure line selection step when small current neutral grounding system is connected to arc suppression coil:
1. monitor bus in real time and take the phase place and the amplitude of the zero sequence quintuple harmonics electric current on the line out of, all zero sequence quintuple harmonics electric currents are carried out amplitude relatively, select the zero sequence quintuple harmonics electric current of three amplitude maximums, be designated as respectively by amplitude order from big to small: i
50-1, i
50-2, i
50-3
2. three zero sequence quintuple harmonics electric currents selecting are carried out the phase bit comparison, select one of them direction of current zero sequence quintuple harmonics electric current different with other two, then the circuit at this zero sequence quintuple harmonics electric current place is a faulty line;
3. work as i in three zero sequence quintuple harmonics electric currents
50-2Amplitude much larger than i
50-3Amplitude the time, if i
50-1And i
50-2Current opposite in direction, then judge i
50-1The circuit at place is a faulty line, otherwise judges that bus is a faulty line.
2. a kind of novel fault selection method in the small current neutral grounding system according to claim 1, it is characterized in that: the setting valve of residual voltage is set at 20% of specified phase voltage amplitude in the described step (1), and fixedly the threshold magnitude of voltage is set at 1.1 times of specified phase voltage amplitude.
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| CN110579684A (en) * | 2019-09-04 | 2019-12-17 | 安徽沃华电力设备有限公司 | low-current grounding system line selection method based on fusion algorithm |
| CN111551823A (en) * | 2020-05-14 | 2020-08-18 | 中国南方电网有限责任公司 | Power distribution network fault line selection method and system based on angle similarity |
| CN112305374A (en) * | 2020-10-22 | 2021-02-02 | 西安工程大学 | Power distribution network single-phase earth fault line selection method |
| CN112305374B (en) * | 2020-10-22 | 2024-05-24 | 西安工程大学 | Single-phase earth fault line selection method for power distribution network |
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| CN113644622A (en) * | 2021-01-18 | 2021-11-12 | 保定钰鑫电气科技有限公司 | Device for auxiliary treatment of interphase short circuit |
| CN112993952B (en) * | 2021-04-20 | 2021-07-27 | 国网四川省电力公司电力科学研究院 | Low-current grounding system power restoration protection method and device and computer equipment |
| CN112993952A (en) * | 2021-04-20 | 2021-06-18 | 国网四川省电力公司电力科学研究院 | Low-current grounding system power restoration protection method and device and computer equipment |
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| CN114895145A (en) * | 2022-05-05 | 2022-08-12 | 云南电网有限责任公司电力科学研究院 | Power distribution network line selection protection accuracy generation method, system, device and storage medium |
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