CN102540015A - Distance measuring method and distance measuring device for single-phase grounding of low-current grounding system - Google Patents
Distance measuring method and distance measuring device for single-phase grounding of low-current grounding system Download PDFInfo
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Abstract
The invention discloses a distance measuring method, which is used for measuring the position of a fault point of a low-current grounding system, wherein the fault point generates single-phase grounding. The distance measuring method comprises the following steps of: step 102, setting a measuring point on a bus of the low-current grounding system, and synchronously collecting a voltage traveling wave in time, wherein when the single-phase grounding is generated on an outgoing line, the traveling wave comprises a fault initial traveling wave propagated with a conducting wire through the conducting wire and a fault initial traveling wave propagated with the earth through the conducting wire; and step 104, obtaining a distance from the measuring point to the fault point according to x=v1*v2*[delta]t/(v1-v2), wherein [delta]t is the time difference of the time that the fault initial traveling wave propagated with the earth through the conducting wire reaches to the measuring point and the time that the fault initial traveling wave propagated with the conducting wire through the conducting wire reaches to the measuring point, v1 is the wave speed of the traveling wave propagated with the conducting wire through the conducting wire, v2 is the wave speed of the traveling wave propagated with the earth through the conducting wire, and x is the distance from the measuring point to the fault point. The invention further discloses a distance measuring device. According to the distance measuring method and the distance measuring device, the position of the fault point generating the single-phase grounding can be effectively detected.
Description
Technical field
The present invention relates to field of relay protection in power, in particular to a kind of distance-finding method and distance measuring equipment of position of the trouble spot that is used for the measured current grounding system single-phase grounding.
Background technology
Small current neutral grounding system is meant when singlephase earth fault takes place, the system that fault current is less, specifically refer to isolated neutral, neutral point through arc suppression coil or neutral point through the high resistance grounding system, be commonly called as small current system.Small current system generation singlephase earth fault because of not constituting short-circuit loop, needn't excise faulty line fast, stops user's power supply.According to statistics, singlephase earth fault accounts for more than 70% of whole all faults of distribution system.For guaranteeing power supply reliability, the distribution system of China adopts small current system usually.Behind the small current system generation singlephase earth fault; As can not in time eliminate fault; The fault electric arc possibility burning apparatus of trouble spot, and cause phase-to phase fault, expansion accident; Therefore the Operation of Electric Systems rules of China regulation: small current system generation singlephase earth fault allows charging operation two hours, means that also singlephase earth fault must remove in two hours.Remove fault, must confirm abort situation, the method that detects the single-phase grounded malfunction in grounded system of low current position is called fault localization.But because single-phase earthing of small current earthing system does not constitute tangible short-circuit loop, the steady-state signal characteristic is not obvious, and therefore, the single-phase grounded malfunction in grounded system of low current range finding is an insurmountable difficult problem always.
At present, the distance-finding method of the capable ripple of initial current that single-phase earthing distance-finding method and distance measuring equipment have proposed to obtain based on phase current mutual inductor and zero sequence current mutual inductor in the correlation technique has satisfied the rig-site utilization requirement of distribution circuit single-phase earth fault range finding.Yet, bigger usually on the one hand because the no-load voltage ratio of on-the-spot phase current mutual inductor receives the influence of maximum load current, be unfavorable for obtaining of current traveling wave signal; Uncertain on the other hand, be unfavorable for and the no-load voltage ratio coupling of zero sequence current mutual inductor, therefore, be difficult to use in the bigger on-the-spot said method of load current, be necessary to seek a kind of new method and satisfy the bigger rig-site utilization requirement of load current.
Summary of the invention
Technical matters to be solved by this invention is, a kind of new mode is provided, and is applicable to that current transformer can not effectively obtain the field condition of capable ripple, measures the distance of singlephase earth fault exactly.
In view of this; The invention discloses a kind of distance-finding method, be used for the position of the trouble spot of measured current grounding system single-phase grounding, comprising: step 102; Setting measurement point on the bus of small current neutral grounding system; And real-time synchronous acquisition voltage traveling wave, when in the said outlet single-phase earthing taking place, comprise in the said voltage traveling wave through the fault initial row ripple of lead and wire spread with through the fault initial row ripple of lead and the earth propagation; Step 104; According to x=v1 * v2 * Δ t/ (v1-v2); Obtain the distance of said measurement point to said trouble spot; Wherein, Δ t is that the said fault initial row ripple of propagating through lead and the earth arrives the time of said measurement point and saidly arrives mistiming of the time of said measurement point through the fault initial row ripple of lead and wire spread, and v1 is the wave velocity through the voltage traveling wave of lead and wire spread; V2 is that x is the distance of said measurement point to said trouble spot through the wave velocity of the voltage traveling wave of lead and the earth propagation.
In technique scheme; Preferably; In said step 102, a phase of working voltage mutual inductor and the said voltage traveling wave of the real-time synchronous acquisition of open delta voltage of voltage transformer (VT), wherein; Comprise said fault initial row ripple in the voltage traveling wave of one phase acquisition of said voltage transformer (VT), comprise said fault initial row ripple in the voltage traveling wave of said voltage transformer (VT) open delta voltage collection through lead and the earth propagation through lead and wire spread.
In technique scheme; Preferably; In said step 104; When the situation of single-phase earthing takes place in the said outlet, said voltage traveling wave is carried out wavelet transformation to obtain fault initial row ripple through lead and wire spread and arrive the time of said measurement point and to arrive through the fault initial row ripple of lead and the earth propagation the time of said measurement point.
The invention also discloses a kind of distance measuring equipment; The position that is used for the trouble spot of measured current grounding system single-phase grounding; Comprise: acquisition module, setting measurement point in the outlet of small current neutral grounding system, and real-time synchronous acquisition voltage traveling wave; When single-phase earthing takes place in the said outlet, comprise in the said voltage traveling wave through the fault initial row ripple of lead and wire spread with through the fault initial row ripple of lead and the earth propagation; Distance calculation module; According to x=v1 * v2 * Δ t/ (v1-v2); Obtain the distance of said measurement point to said trouble spot; Wherein, Δ t is that the said fault initial row ripple of propagating through lead and the earth arrives the time of said measurement point and saidly arrives mistiming of the time of said measurement point through the fault initial row ripple of lead and wire spread, and v1 is the wave velocity through the voltage traveling wave of lead and wire spread; V2 is that x is the distance of said measurement point to said trouble spot through the wave velocity of the voltage traveling wave of lead and the earth propagation.
In technique scheme; Preferably; Said acquisition module comprises: voltage transformer (VT) one phase and voltage transformer (VT) open delta, and the real-time said voltage traveling wave of synchronous acquisition, wherein; Comprise said fault initial row ripple in the voltage traveling wave of said voltage transformer (VT) one phase acquisition, comprise said fault initial row ripple in the voltage traveling wave of said voltage transformer (VT) open delta collection through lead and the earth propagation through lead and wire spread.
In technique scheme; Preferably; Also comprise: the wavelet transformation module; When in said outlet, producing the situation of single-phase earthing, the voltage traveling wave of gathering is carried out wavelet transformation to obtain fault initial row ripple through lead and wire spread and arrive the time of said measurement point and to arrive through the fault initial row ripple of lead and the earth propagation the time of said measurement point.
According to technique scheme, can realize a kind of single-phase earthing distance-finding method and distance measuring equipment, can measure the distance of the trouble spot that produces single-phase earthing of small current earthing system effectively.
Description of drawings
Fig. 1 is the process flow diagram according to distance-finding method of the present invention;
Fig. 2 is the block diagram according to distance measuring equipment of the present invention;
Fig. 3 is the process flow diagram of distance-finding method according to an embodiment of the invention;
Fig. 4 is the process flow diagram of distance-finding method according to an embodiment of the invention.
Embodiment
In order more to be expressly understood above-mentioned purpose of the present invention, feature and advantage, the present invention is further described in detail below in conjunction with accompanying drawing and embodiment.
Set forth a lot of details in the following description so that make much of the present invention, still, the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to the restriction of following disclosed specific embodiment.
Fig. 1 is the process flow diagram according to distance-finding method of the present invention.
As shown in Figure 1; The invention provides a kind of distance-finding method, be used for the position of the trouble spot of measured current grounding system single-phase grounding, comprising: step 102; Setting measurement point on the bus of small current neutral grounding system; And real-time synchronous acquisition voltage traveling wave, when producing single-phase earthing in the said outlet, comprise in the said voltage traveling wave through the fault initial row ripple of lead and wire spread with through the fault initial row ripple of lead and the earth propagation; Step 104; According to x=v1 * v2 * Δ t/ (v1-v2); Obtain the distance of said measurement point to said trouble spot; Wherein, Δ t is that the said fault initial row ripple of propagating through lead and the earth arrives the time of said measurement point and saidly arrives mistiming of the time of said measurement point through the fault initial row ripple of lead and wire spread, and v1 is the wave velocity through the voltage traveling wave of lead and wire spread; V2 is that x is the distance of said measurement point to said trouble spot through the wave velocity of the voltage traveling wave of lead and the earth propagation.
In technique scheme; In said step 102; Working voltage mutual inductor one phase and the said voltage traveling wave of the real-time synchronous acquisition of voltage transformer (VT) open delta; Wherein, comprise said fault initial row ripple in the voltage traveling wave of said voltage transformer (VT) one phase acquisition, comprise said fault initial row ripple in the voltage traveling wave of said voltage transformer (VT) open delta voltage collection through lead and the earth propagation through lead and wire spread.
In technique scheme; In said step 104; When the situation of single-phase earthing takes place in the said outlet, said current traveling wave is carried out wavelet transformation to obtain fault initial row ripple through lead and wire spread and arrive the time of said measurement point and to arrive through the fault initial row ripple of lead and the earth propagation the time of said measurement point.
Fig. 2 is the block diagram according to distance measuring equipment of the present invention.
As shown in Figure 2; The present invention also provides a kind of distance measuring equipment 200, is used for the position of the trouble spot of measured current grounding system single-phase grounding, comprising: acquisition module 202; Setting measurement point on the bus of small current neutral grounding system; And real-time synchronous acquisition voltage traveling wave, when producing single-phase earthing in the said outlet, comprise in the said voltage traveling wave through the fault initial row ripple of lead and wire spread with through the fault initial row ripple of lead and the earth propagation; Distance calculation module 204; According to x=v1 * v2 * Δ t/ (v1-v2); Obtain the distance of said measurement point to said trouble spot; Wherein, Δ t is that the said fault initial row ripple of propagating through lead and the earth arrives the time of said measurement point and saidly arrives mistiming of the time of said measurement point through the fault initial row ripple of lead and wire spread, and v1 is the wave velocity through the voltage traveling wave of lead and wire spread; V2 is that x is the distance of said measurement point to said trouble spot through the wave velocity of the voltage traveling wave of lead and the earth propagation.
In technique scheme; Preferably; Said acquisition module 202 comprises: voltage transformer (VT) one phase and voltage transformer (VT) open delta, and the real-time said voltage traveling wave of synchronous acquisition, wherein; Comprise said fault initial row ripple in the voltage traveling wave of said voltage transformer (VT) one phase acquisition, comprise said fault initial row ripple in the voltage traveling wave of said voltage transformer (VT) open delta collection through lead and the earth propagation through lead and wire spread.
In technique scheme; Preferably; Also comprise: the wavelet transformation module; When in said outlet, producing the situation of single-phase earthing, the voltage traveling wave of gathering is carried out wavelet transformation to obtain fault initial row ripple through lead and wire spread and arrive the time of said measurement point and to arrive through the fault initial row ripple of lead and the earth propagation the time of said measurement point.
Fig. 3 is the process flow diagram of distance-finding method according to an embodiment of the invention.
As shown in Figure 3, step 302, the voltage traveling wave on the synchronous acquisition small current neutral grounding system bus in real time; Step 304 is obtained through the voltage initial row ripple of lead and wire spread and the voltage initial row ripple propagated through lead and the earth; Step 306 is extracted in the outlet through the electric current initial row ripple of lead and wire spread with through the temporal characteristics of the voltage initial row ripple of lead and the earth propagation; Step 308 is relatively through the voltage initial row ripple of lead and wire spread with through the mistiming of lead with the voltage initial row ripple of the earth propagation, calculating fault distance.
The capable wave characteristic of said single-phase earthing is: the row wave speed of between lead and lead, propagating is fast, arrives measurement point earlier; The row wave speed of between lead and the earth, propagating is slow, and the back arrives measurement point.Suppose that touchdown time was 0 moment, the row wave speed of between lead and lead, propagating is v1, and after ground connection was taken place, the moment that the initial row ripple arrives measurement point was t1; The row wave speed of between lead and the earth, propagating is v2, and after ground connection was taken place, the moment that the initial row ripple arrives measurement point was t2, and the distance that assumed fault is put measurement point is x, then
x＝v1×t1
x＝v2×t2
Because ground connection is taken place unknown constantly; Can only obtain two types of initial row ripple difference time of arrival Δ t=t2-t1 at measurement point; Therefore can push away: x=v1 * v2 * Δ t/ (v1-v2); That is to say fault distance under the situation that row wave speed is known with time of arrival, difference was confirmed through different travel paths, fault distance can be surveyed.And in small current neutral grounding system, the circuit that puts into operation, the circuit model confirms that structure confirms that the row wave speed of different travel paths is also certain.As long as therefore can accurately measure the mistiming that arrives measurement point through the singlephase earth fault initial row ripple of different travel paths, can accurately measure fault distance.
The principle of the distance-finding method in the present embodiment:
When in the small current neutral grounding system outlet singlephase earth fault taking place, the trouble spot will produce the fault traveling wave of propagating along circuit.The failed row wave trajectory can be between lead and the lead, also can lead and the earth between.The row wave speed of between lead and lead, propagating is fast, and the row wave speed of between lead and the earth, propagating is slow.The capable ripple of between lead and lead, propagating can be by the arbitrary perception mutually of voltage transformer (VT), but can not be by the perception of voltage transformer (VT) open delta; And the capable ripple of between lead and the earth, propagating both can be by the perception mutually of voltage transformer (VT), also can be by the perception of voltage transformer (VT) open delta.Therefore, the arbitrary phase of voltage transformer (VT) both can measure the fault initial row ripple of between lead and lead, propagating, and also can measure the fault initial row ripple of between lead and the earth, propagating; The voltage transformer (VT) open delta measures the fault initial row ripple of between lead and the earth, propagating only.Voltage transformer (VT) generally has been installed in the small current neutral grounding system, and no-load voltage ratio is confirmed.Then after single-phase earthing took place, the fault initial row ripple of the initial row ripple that voltage transformer (VT) one measures mutually between lead and lead, propagating, the initial row ripple that the voltage transformer (VT) open delta measures were the fault initial row ripple of between lead and the earth, propagating.Therefore after single-phase earthing took place, comparative voltage mutual inductor one mutually detected initial row ripple and detected initial row ripple mistiming of voltage transformer (VT) open delta can obtain the mistiming at fault initial row ripple of propagating between lead and the lead and the fault initial row ripple arrival measurement point between lead and the earth, propagated.
Fig. 4 is the process flow diagram of distance-finding method according to an embodiment of the invention.
As shown in Figure 4, step 402, based on the voltage transformer (VT) of installing on the bus in the transformer station, the voltage traveling wave data on the real-time synchronous acquisition bus, SF 2Mhz; In theory, SF is high more good more, but the selection of SF receives the processing speed of CPU or microcomputer and the restriction that range error requires.In conjunction with the present level of information technology, select typical 2Mhz, SF is along with the development of technology can be increasingly high.
Ground connection has taken place if monitor in step 406 on the feeder line, each 128 the one phase voltage row ripple and the capable wave datum of open delta voltage of record before and after the ground connection are carried out four layers of wavelet transformation respectively, and the wavelet function is here selected a derived function of cubic B-spline function for use; Wavelet transformation result to the row wave datum extracts modulus maximum; Confirm respectively from the fault initial row ripple of voltage transformer (VT) one phase with from moment of the corresponding modulus maximum of fault initial row ripple of voltage transformer (VT) open delta.
Traveling wave electric amount among the present invention refers to because the electromagnetic wave of in electric system, propagating that the electric system disturbance causes.Row wave-wave head can be regarded pulse signal as, has full range band component.The traveling wave electric amount that utilizes among the present invention is the capable wave-wave head signal with high frequency transient characteristic.
The present invention is based on the capable ripple of the fault generating that measures, extract the mistiming that arrives measurement point through the fault initial row ripple of different travel paths, in conjunction with the wave velocity of the capable ripple of different travel paths, realization fault localization.
The present invention can monitor the ruuning situation of circuit on power system in real time, and electric system singlephase earth fault range information in time is provided, and reduces the electric power system fault probability, improves the power system power supply reliability, guarantees the power system safety and stability operation.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. single-phase earthing of small current earthing system distance-finding method is used for the position of the trouble spot of measured current grounding system single-phase grounding, it is characterized in that, comprising:
Step 102; Setting measurement point on the bus of small current neutral grounding system; And real-time synchronous acquisition voltage traveling wave, when in the said outlet single-phase earthing taking place, comprise in the said voltage traveling wave through the fault initial row ripple of lead and wire spread with through the fault initial row ripple of lead and the earth propagation;
Step 104; According to x=v1 * v2 * Δ t/ (v1-v2); Obtain the distance of said measurement point to said trouble spot; Wherein, Δ t is that the said fault initial row ripple of propagating through lead and the earth arrives the time of said measurement point and saidly arrives mistiming of the time of said measurement point through the fault initial row ripple of lead and wire spread, and v1 is the wave velocity through the voltage traveling wave of lead and wire spread; V2 is that x is the distance of said measurement point to said trouble spot through the wave velocity of the voltage traveling wave of lead and the earth propagation.
2. single-phase earthing of small current earthing system distance-finding method according to claim 1; It is characterized in that; In said step 102; The said voltage traveling wave of the real-time synchronous acquisition of open delta voltage of one phase voltage of working voltage mutual inductor and voltage transformer (VT); Wherein, comprise said fault initial row ripple in the voltage traveling wave of a phase voltage collection of said voltage transformer (VT), comprise said fault initial row ripple in the voltage traveling wave of the open delta voltage collection of said voltage transformer (VT) through lead and the earth propagation through lead and wire spread.
3. single-phase earthing of small current earthing system distance-finding method according to claim 2; It is characterized in that; In said step 104; When the situation of single-phase earthing takes place in the said outlet, said voltage traveling wave is carried out wavelet transformation to obtain fault initial row ripple through lead and wire spread and arrive the time of said measurement point and to arrive through the fault initial row ripple of lead and the earth propagation the time of said measurement point.
4. single-phase earthing of small current earthing system distance measuring equipment is used for the position of the trouble spot of measured current grounding system single-phase grounding, it is characterized in that, comprising:
Acquisition module; Setting measurement point on the bus of small current neutral grounding system; And real-time synchronous acquisition voltage traveling wave, when in the said outlet single-phase earthing taking place, comprise in the said voltage traveling wave through the fault initial row ripple of lead and wire spread with through the fault initial row ripple of lead and the earth propagation;
Distance calculation module; According to x=v1 * v2 * Δ t/ (v1-v2); Obtain the distance of said measurement point to said trouble spot; Wherein, Δ t is that the said fault initial row ripple of propagating through lead and the earth arrives the time of said measurement point and saidly arrives mistiming of the time of said measurement point through the fault initial row ripple of lead and wire spread, and v1 is the wave velocity through the voltage traveling wave of lead and wire spread; V2 is that x is the distance of said measurement point to said trouble spot through the wave velocity of the voltage traveling wave of lead and the earth propagation.
5. single-phase earthing of small current earthing system distance measuring equipment according to claim 4; It is characterized in that; Said acquisition module is based on a phase of voltage transformer (VT) and the open delta voltage of voltage transformer (VT); The real-time said voltage traveling wave of synchronous acquisition; Wherein, comprise said fault initial row ripple in the voltage traveling wave of a phase acquisition of said voltage transformer (VT), comprise said fault initial row ripple in the voltage traveling wave of said voltage transformer (VT) open delta voltage collection through lead and the earth propagation through lead and wire spread.
6. single-phase earthing of small current earthing system distance measuring equipment according to claim 5 is characterized in that, also comprises:
The wavelet transformation module; When the situation of single-phase earthing takes place, the voltage traveling wave of gathering is carried out wavelet transformation to obtain fault initial row ripple through lead and wire spread and arrive the time of said measurement point and to arrive through the fault initial row ripple of lead and the earth propagation the time of said measurement point in said outlet.
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| CN103412240A (en) * | 2013-07-24 | 2013-11-27 | 昆明理工大学 | Same-tower double-power transmission circuit single-end traveling wave fault location method |
| CN103424667A (en) * | 2013-08-05 | 2013-12-04 | 昆明理工大学 | Distance measurement method for post measurement simulation match of cable-hybrid line fault wave arriving time sequence |
| CN103884963A (en) * | 2014-03-12 | 2014-06-25 | 国家电网公司 | Distribution network fault distance measurement method based on fault transient state traveling wave zero-mode and aerial-mode speed difference |
| CN107144762A (en) * | 2017-04-20 | 2017-09-08 | 广西电网有限责任公司电力科学研究院 | A kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device |
| CN107247219A (en) * | 2017-07-27 | 2017-10-13 | 云南电网有限责任公司 | A kind of ultra-high-tension power transmission line abort situation decision method based on waveform similarity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103412240A (en) * | 2013-07-24 | 2013-11-27 | 昆明理工大学 | Same-tower double-power transmission circuit single-end traveling wave fault location method |
| CN103424667A (en) * | 2013-08-05 | 2013-12-04 | 昆明理工大学 | Distance measurement method for post measurement simulation match of cable-hybrid line fault wave arriving time sequence |
| CN103424667B (en) * | 2013-08-05 | 2016-04-20 | 昆明理工大学 | The distance-finding method that a kind of cable mixed line fault ripple mates to sequential Simulation after test |
| CN103884963A (en) * | 2014-03-12 | 2014-06-25 | 国家电网公司 | Distribution network fault distance measurement method based on fault transient state traveling wave zero-mode and aerial-mode speed difference |
| CN107144762A (en) * | 2017-04-20 | 2017-09-08 | 广西电网有限责任公司电力科学研究院 | A kind of distribution net work earthing fault localization method based on Small Electric Current Earthing And Routing Device |
| CN107144762B (en) * | 2017-04-20 | 2023-04-11 | 广西电网有限责任公司电力科学研究院 | Power distribution network ground fault positioning method based on low-current ground line selection device |
| CN107247219A (en) * | 2017-07-27 | 2017-10-13 | 云南电网有限责任公司 | A kind of ultra-high-tension power transmission line abort situation decision method based on waveform similarity |
| CN107247219B (en) * | 2017-07-27 | 2019-07-23 | 云南电网有限责任公司 | A kind of ultra-high-tension power transmission line abort situation determination method based on waveform similarity |
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