CN109828178A - A kind of localization method and system of transmission lines earth fault - Google Patents
A kind of localization method and system of transmission lines earth fault Download PDFInfo
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- CN109828178A CN109828178A CN201711180610.4A CN201711180610A CN109828178A CN 109828178 A CN109828178 A CN 109828178A CN 201711180610 A CN201711180610 A CN 201711180610A CN 109828178 A CN109828178 A CN 109828178A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a kind of localization methods of transmission lines earth fault, and described method includes following steps: the signal injection module injected frequency pumping signal different from mains frequency on the transmission line；Signal response detection module detects the voltage and current of the pumping signal in the injection end of the pumping signal, calculate the imaginary part of the line loop complex impedance in the case where injecting the pumping signal, as reactance value, by the reactance value multiply in a proportionality constant to get the pumping signal injection phase the distance between to fault point.So, the localization method of the transmission lines earth fault, which can obtain, directly to detect whether transmission line of electricity has ground connection, judge whether to meet combined floodgate condition with this, when truly having ground connection, it can also judge grounding point electrical distance, it is convenient to be quickly found out grounding point in time and excluded.The invention also discloses a kind of positioning systems of transmission lines earth fault.
Description
Technical field
The present invention relates to field of power systems, and in particular to a kind of localization method and system of transmission lines earth fault.
Background technique
Hanging earthing conductor is one of safety curtain for protecting service personnel, is the lifeline of electrical employee, can prevent from coming suddenly
Injury of the electricity to human body.But in real work, since ground line seems simple using frequent and operation, it is easy to make one to generate paralysis
Thought, importance also tend to be ignored by people, incorrect service condition often occur, connect so that reducing and even losing sometimes
The safeguard protection of ground wire acts on, it is necessary to cause enough attention.When line maintenance, how to ensure to be grounded effective connection, in addition to wanting
It follows outside safety correct operation, it is also desirable to have obvious, intuitive differentiation means for differentiating the connection situation of ground line.
The research both at home and abroad about the ground line this respect that can directly display connection situation is almost blank at present,
Judge ground line whether removed and have combined floodgate power transmission condition research it is also extremely limited.
Currently, domestic scholars carry out a large amount of research work for ground connection management.Xi'an Communications University proposes transmission and distribution line
Great distance side's anti-error locking system, the system principle diagram are as shown in Figure 1.The disconnecting link that the device can detect electric line both ends closes
Conjunction state transmits information to opposite end power station, can prevent electric line electrification from closing earthing knife-switch and with the earthing knife-switch combined floodgate pernicious mistake of two classes
Operating accident.This kind of anti-misoperation apparatus has certain effect, but there are two aspects: first is that being only capable of identification earthing
Lock, and ground line is helpless to temporarily overlapped；Second is that this kind of device relies on the correct detection and communication of disconnecting link device state
Channel it is unimpeded, system structure is complex, and reliability is difficult to ensure.
University Of Chongqing proposes " hard locking " technology on this basis, which acquires opposite end grounding switch state letter first
Breath, is transferred to data controlling terminal for collected information remote and is forwarded to route opposite end, and system issues locking or unlock life
It enables and gives this side breaker closing control loop, no matter realizing that the earthing knife-switch of route which side is not pulled open breaker and is all latched, thus anti-
The only generation of misoperation fault.This system basic principle is similar with front, only means of communication be changed to short message, GPRS etc. compared with
For advanced means, server and client's control terminal are established using computer, but the problem of both of the aforesaid aspect still remains.
Current anti-switching on earth wire by the raising of peopleware also by being changed by technological means merely, and main point
For two classes: first is that the state of each grounding switch and closing position is sent to Monitor Computer Control System in monitoring station, carrying out long-range
Locking；Second is that being grounded the locking between disconnecting link and breaker by mechanical device.
In addition one kind is proposed by ferromagnetic resonance voltage stabilized transformer detection ground connection there are also researcher to prevent switching on earth wire
Method.Becoming primary side distal end in resonance pressure stabilizing and apply voltage, detects transformer secondary voltage swing, it is assumed that ground connection exists,
Transformer secondary is similar to short circuit, voltage very little, so that " indicator light " extinguishes, No switching on.This apparatus structure is simple, have compared with
Strong practicability, but due to different voltages grade, the line parameter circuit value difference of obstructed length is big, whether only relying on " indicator light " extinguishing
To indicate whether that ground connection difficulty is larger.
Also there is part power supply bureau and detected with insulating megger whether the temporary ground wire of overhead line road disconnects.Insulation is shaken
Table is the specialized instrument and equipment for measuring insulation resistance.If there is no grounding point on route, it can regard sliver road as over the ground
Insulation, should also be very big with the resistance value that insulating megger detected；Conversely, grounding point if it exists on route, detection
Resistance out should be very small, and operator can by virtue of experience judge.But, it is connect this requires all on route
Place must all remove completely and also disconnect including the grounding switch in power station, this point and " DL/T741-2011 electric industry safety
Working regulation (power line portion) " in relevant regulations run counter to, do not allow；Secondly, insulating megger is right in the detection process
Route pressurization, this constitutes threat to the personal safety of line maintenance and operations staff；Meanwhile if there is grounding point on route,
Electric current in insulating megger is very large, it is also possible to burn out megger.Also it is proposed that using high-voltage D.C. generator and route
The existing equipments such as direct resistance metering instrument are detected, and all there is the above problem --- to disconnect all grounding point, therefore more than
It is not all available in method actual production.
Electric fault-operation accident is that electric system takes place frequently one of accident, can cause device damage, large-area power-cuts even people
The major accidents such as body injures and deaths.Combined floodgate with ground is one of 5 kinds of pernicious maloperations, prevents maloperation from filling although electric system takes
It sets with the relevant technologies measure (five is anti-) and avoids maloperation, but combined floodgate misoperation fault with ground still happens occasionally；Especially
Pernicious misoperation fault generation between adjacent substations with earthing knife-switch combined floodgate is very frequent, has become the chronic illness of electric system.
Existing substation's micro_computer five_proof device merely with substation stand in device information, be unable to the outer device of identification station and defeated
The state of wire pair end grounding switch cannot play effective prevention to the misoperation fault substation.To prevent such accident
Generation, it is domestic it is proposed that acquiring all disconnecting link contact informations is sent to control centre, carry out the skill of " soft locking " in control centre
Art measure, but this cannot play the role of forced blocking, and still there is the possibility for occurring to close a floodgate with earthing knife-switch at scene.
Some researchers of last century the nineties propose that such as power carrier communication will be adjacent (right using certain means of communication
End) grounding switch status information of standing reaches our station, if distance station grounding switch closes a floodgate, automatic blocking our station closing operation, from
And avoid our station combined floodgate maloperation with ground.This kind of anti-misoperation apparatus has certain effect, but there are problems that in terms of two: one
It is to be only capable of identification grounding switch, and ground line is helpless to temporarily overlapped；Second is that this kind of device relies on disconnecting link device state
Correct detection and communications conduit it is unimpeded, system structure is complex, and reliability is difficult to ensure.There is researcher to mention again in recent years
Lock-in control system between preventing the station of combined floodgate with ground is established out, and this system basic principle is similar with front, only communicates
Means are changed to the relatively advanced means such as short message, GPRS, establish server and client's control terminal, but aforementioned two using computer
The problem of a aspect, still remains.
In addition there are also researchers to propose that a kind of ferromagnetic resonance voltage stabilized transformer detection is grounded the side to prevent switching on earth wire
Method.This equipment is to become a distant place in resonance pressure stabilizing to apply voltage, detects transformer secondary voltage size, it is believed that if there is ground connection to deposit
, in transformer pair side close to short circuit, voltage very little, so that " indicator light " extinguishes, No switching on.This apparatus structure is simple,
There is stronger practicability, but due to different voltages grade, the line parameter circuit value difference of obstructed length is big, only relies on " indicator light " extinguishing
Whether come indicate whether ground connection difficulty it is larger.
For this purpose, the applicant devises the localization method and system of a kind of new transmission lines earth fault, it is necessary to set
One kind is counted, to overcome the above problem.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the shortcomings of the prior art, providing a kind of transmission line of electricity ground connection event
The localization method of barrier, can obtain can directly detect whether transmission line of electricity has ground connection, judge whether to meet combined floodgate condition with this, really
When having ground connection, moreover it is possible to judge grounding point electrical distance, it is convenient to be quickly found out grounding point in time and excluded.In addition, of the invention
Additionally provide a kind of positioning system of transmission lines earth fault.
Technical solution used by the present invention solves the problems, such as it is:
On the one hand, a kind of localization method of transmission lines earth fault is provided, is included the following steps:
The signal injection module injected frequency pumping signal different from mains frequency on the transmission line；
Signal response detection module detects the voltage and current of the pumping signal, meter in the injection end of the pumping signal
The imaginary part of the line loop complex impedance in the case where injecting the pumping signal, as reactance value are calculated, by the reactance value
Multiply in a proportionality constant to get the pumping signal injection phase the distance between to fault point.
In the localization method of transmission lines earth fault provided by the invention, transmit electricity under the action of the pumping signal
The phase of route should be able to significantly reflect whether route has short circuit.
In the localization method of transmission lines earth fault provided by the invention, the signal injection module can bear to incude
Voltage.
In the localization method of transmission lines earth fault provided by the invention, the signal response detection module can be born
Induced voltage.
In the localization method of transmission lines earth fault provided by the invention, the pumping signal electric current of injection is greater than
Equal to 10 milliamperes and it is less than or equal to 500 milliamperes.
In the localization method of transmission lines earth fault provided by the invention, the frequency of the pumping signal of injection is
The K of work frequency is divided, and K is integer.
In the localization method of transmission lines earth fault provided by the invention, K is even number.
In the localization method of transmission lines earth fault provided by the invention, when the frequency of the pumping signal, measurement
Between and mains frequency three between there is correlation, i.e. signal measurement time, is N times of the excitation signal cycle, and N is whole
It counts, while being also M times of the mains frequency period, M is integer.
On the other hand, the present invention also provides a kind of positioning systems of transmission lines earth fault, comprising:
Signal injection module, the pumping signal different from mains frequency for injected frequency on the transmission line；
Signal responds detection module, for detecting the voltage and electricity of the pumping signal in the injection end of the pumping signal
Stream, calculates the imaginary part of the line loop complex impedance in the case where injecting the pumping signal, as reactance value, by the electricity
Anti- value multiply in a proportionality constant to get the pumping signal injection phase the distance between to fault point.
In the positioning system of transmission lines earth fault provided by the invention, the signal injection module and the signal
Response detection module can bear induced voltage.
Compared with prior art, implement the localization method of transmission lines earth fault provided by the invention, have has as follows
Beneficial effect: described method includes following steps: injected frequency is different from mains frequency on the transmission line for signal injection module
Pumping signal；Signal response detection module detects the voltage and current of the pumping signal in the injection end of the pumping signal,
The imaginary part of the line loop complex impedance in the case where injecting the pumping signal, as reactance value are calculated, by the reactance
Value multiply in a proportionality constant to get the pumping signal injection phase the distance between to fault point.In this way, the transmission of electricity
The localization method of line-to-ground fault, which can obtain, directly to detect whether transmission line of electricity has ground connection, judge whether to meet with this
Combined floodgate condition, when truly having ground connection, moreover it is possible to judge grounding point electrical distance, it is convenient to be quickly found out grounding point in time and excluded.
Detailed description of the invention
Fig. 1 is the schematic diagram that Xi'an Communications University proposes electric line distant place anti-error locking system；
Fig. 2 is the flow chart of embodiment one.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.Obviously, described embodiments are only a part of the embodiments of the present invention, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Embodiment one
Referring to fig. 2, the localization method for present embodiments providing a kind of transmission lines earth fault, includes the following steps:
The signal injection module injected frequency pumping signal different from mains frequency on the transmission line；
Signal response detection module detects the voltage and current of the pumping signal, meter in the injection end of the pumping signal
The imaginary part of the line loop complex impedance in the case where injecting the pumping signal, as reactance value are calculated, by the reactance value
Multiply in a proportionality constant to get the pumping signal injection phase the distance between to fault point.
The phase of transmission line of electricity should be able to significantly reflect whether route has short circuit under the action of the pumping signal.The letter
Number injection module can bear induced voltage.The signal response detection module can bear induced voltage.The excitation letter of injection
Number electric current is more than or equal to 10 milliamperes and is less than or equal to 500 milliamperes.The frequency of the pumping signal of injection is K points of work frequency
Frequently, K is integer, and preferred K is even number.
There is correlation, i.e. signal measurement between the frequency of the pumping signal, time of measuring and mains frequency three
Time is N times of the excitation signal cycle, and N is integer, while being also M times of the mains frequency period, and M is integer.
Test result shows that the method is proposed based on differential and variation principle, to guarantee measurement accuracy, injection
The amplitude of pumping signal need not be large, and current in the fault point is usually several amperes to tens of amperes, and the pumping signal electric current of injection is not
Greater than 1 ampere.In view of the requirement of injecting power consumption and interference free performance, optimal pumping signal electric current is at 10 milliamperes
To between 500 milliamperes.
Test result shows the selection of the exciting signal frequency and time of measuring length of injection, to circuit design is simplified, mentions
High measurement accuracy has great influence.
Network voltage and electric current usually also include higher hamonic wave abundant other than containing fundamental frequency, to reduce fundamental wave
Interference with harmonic wave to measurement, simplifies the design of filter circuit, and the frequency of the pumping signal of injection should avoid the fundamental wave frequency of power grid
Rate and harmonic frequency.
Test result shows only to need when the K that the frequency of the pumping signal of injection is work frequency divides (K is integer)
The time of measuring of the excitation signal cycle of one injection, that is, can reach satisfied measurement accuracy, especially when K takes even number, work
The influence of frequency interference is greatly attenuated, and measurement effect is more preferably.
To time of measuring without strictly limiting, measurement accuracy can undoubtedly be improved by extending time of measuring.At this time
The selection of the exciting signal frequency of injection has bigger freedom degree.Under normal circumstances, the frequency of the pumping signal of injection can be made, surveyed
Measuring has correlation, i.e. signal measurement time between time and mains frequency three, be N times of the excitation signal cycle of injection
(N is integer), while being also M times (M is integer) in power grid electric period.
Due to the pumping signal very little of injection, and the electricity of power grid is very big.Interference of the power grid electric to measurement is excluded,
The design of current measurement path filter and voltage measurement path filter is another key.In general, current measurement channel is filtered
Wave device and voltage measurement path filter should select identical structure and parameter, and filter can be by power frequency bandstop filter and signal
Bandpass filter is composed.After filter completes, parameter can at any time, environment temperature and ambient humidity and deviate,
For the issuable offset of correcting filter characteristic, real-time calibration technology can be used.Normal impedance device is set in measuring device
Change-over switch is measured with calibration, when being not required to fault localization, pumping signal is connected to normal impedance device by change-over switch, to electric current
Channel and voltage channel carry out amplitude and phase calibration；When power grid occurs ground fault and needs fault localization, change-over switch will
Pumping signal is connected to ground fault phase, measures fault point distance.Normal impedance device can be measuring resistance, inductance, capacitor, or
Person is the combination of three, but selection standard resistance stability can be more preferable, and cost is also lower.
Assuming that ground fault occurs in C phase, alien frequencies signal generator is connected to Earth Phase C phase, injects alien frequencies sine to C phase
Electric current, the current signal of current detecting Air conduct measurement fault loop through filter and amplification and are converted to digital quantity, are transmitted to control fortune
Component is calculated, similar processing is made in voltage detecting channel to loop voltage, and control arithmetic unit carries out Fu to electric current and voltage signal
In leaf transformation, find out complex impedance of the fault loop under Injection Signal frequency, imaginary part is reactance value, which multiplies in one
Proportionality constant to get signal decanting point to fault point distance.
Compared with prior art, implement the localization method of transmission lines earth fault provided by the invention with following beneficial
Effect: described method includes following steps: signal injection module on the transmission line injected frequency it is different from mains frequency swash
Encourage signal；Signal response detection module detects the voltage and current of the pumping signal, meter in the injection end of the pumping signal
The imaginary part of the line loop complex impedance in the case where injecting the pumping signal, as reactance value are calculated, by the reactance value
Multiply in a proportionality constant to get the pumping signal injection phase the distance between to fault point.In this way, the power transmission line
The localization method of road ground fault, which can obtain, directly to detect whether transmission line of electricity has ground connection, judge whether to meet with this and close
Lock condition, when truly having ground connection, moreover it is possible to judge grounding point electrical distance, it is convenient to be quickly found out grounding point in time and excluded.
Embodiment two
A kind of positioning system of transmission lines earth fault is present embodiments provided, including signal injection module and signal are rung
Answer detection module.The signal injection module is for the injected frequency pumping signal different from mains frequency on the transmission line；
The signal response detection module is used to detect the voltage and current of the pumping signal, meter in the injection end of the pumping signal
The imaginary part of the line loop complex impedance in the case where injecting the pumping signal, as reactance value are calculated, by the reactance value
Multiply in a proportionality constant to get the pumping signal injection phase the distance between to fault point.
Described in the operating method and its working principle and embodiment one of the positioning system of the transmission lines earth fault
Method is identical, so repeating no more.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, within these are all belonged to the scope of protection of the present invention.
Claims (10)
1. a kind of localization method of transmission lines earth fault, which comprises the steps of:
The signal injection module injected frequency pumping signal different from mains frequency on the transmission line；
Signal response detection module detects the voltage and current of the pumping signal in the injection end of the pumping signal, calculates
The imaginary part of line loop complex impedance, as reactance value in the case where injecting the pumping signal, by the reactance value multiply in
One proportionality constant to get the pumping signal injection phase the distance between to fault point.
2. the localization method of transmission lines earth fault according to claim 1, which is characterized in that in the pumping signal
Under the action of the phase of transmission line of electricity should be able to significantly reflect whether route has short circuit.
3. the localization method of transmission lines earth fault according to claim 1, which is characterized in that the signal injects mould
Block can bear induced voltage.
4. the localization method of transmission lines earth fault according to claim 1, which is characterized in that the signal response inspection
Induced voltage can be born by surveying module.
5. the localization method of transmission lines earth fault according to claim 1, which is characterized in that the excitation of injection
Signal code is more than or equal to 10 milliamperes and is less than or equal to 500 milliamperes.
6. the localization method of transmission lines earth fault according to claim 1, which is characterized in that the excitation of injection
The frequency of signal is that the K of work frequency is divided, and K is integer.
7. the localization method of transmission lines earth fault according to claim 6, which is characterized in that K is even number.
8. the localization method of transmission lines earth fault according to claim 1, which is characterized in that the pumping signal
There is correlation, i.e. signal measurement time between frequency, time of measuring and mains frequency three, be the excitation signal cycle
N times, N is integer, while being also M times of the mains frequency period, and M is integer.
9. a kind of positioning system of transmission lines earth fault characterized by comprising
Signal injection module, the pumping signal different from mains frequency for injected frequency on the transmission line；
Signal responds detection module, for detecting the voltage and current of the pumping signal in the injection end of the pumping signal,
The imaginary part of the line loop complex impedance in the case where injecting the pumping signal, as reactance value are calculated, by the reactance
Value multiply in a proportionality constant to get the pumping signal injection phase the distance between to fault point.
10. the positioning system of transmission lines earth fault according to claim 1, which is characterized in that the signal injection
Module and signal response detection module can bear induced voltage.
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| CN201711180610.4A CN109828178A (en) | 2017-11-23 | 2017-11-23 | A kind of localization method and system of transmission lines earth fault |
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| CN201711180610.4A CN109828178A (en) | 2017-11-23 | 2017-11-23 | A kind of localization method and system of transmission lines earth fault |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244192A (en) * | 2019-07-25 | 2019-09-17 | 淄博威特电气有限公司 | A kind of power overhead network earth fault distance measurement method |
| CN110297161A (en) * | 2019-06-21 | 2019-10-01 | 国网河北省电力有限公司 | Take precautions against the method and scheduling system of with ground power transmission of grid equipment |
| CN111650532A (en) * | 2020-05-28 | 2020-09-11 | 内蒙古大唐国际托克托发电有限责任公司 | Method for judging grounding point of power transmission line |
| CN111998759A (en) * | 2020-09-10 | 2020-11-27 | 广州极飞科技有限公司 | Measuring device and irrigation system |
| CN113109194A (en) * | 2021-03-05 | 2021-07-13 | 上海新力动力设备研究所 | Test method and system for generating mechanical excitation through electromagnetic driving |
| CN113141613B (en) * | 2021-04-27 | 2023-09-26 | 上海淇玥信息技术有限公司 | Communication channel detection method and device and electronic equipment |
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| CN102096019A (en) * | 2009-12-15 | 2011-06-15 | 黄洪全 | Method and device for locating single-phase grounding fault of low-current grounding system |
| CN105223468A (en) * | 2015-09-29 | 2016-01-06 | 湖南大学 | Based on the transmission line of electricity one-end fault ranging method of mapping function |
| CN106199333A (en) * | 2016-06-30 | 2016-12-07 | 国网江西省电力公司检修分公司 | The single-ended power frequency amount compensated based on distribution capacity improves distributed constant self adaptation distance-finding method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110297161A (en) * | 2019-06-21 | 2019-10-01 | 国网河北省电力有限公司 | Take precautions against the method and scheduling system of with ground power transmission of grid equipment |
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| CN111998759A (en) * | 2020-09-10 | 2020-11-27 | 广州极飞科技有限公司 | Measuring device and irrigation system |
| CN113109194A (en) * | 2021-03-05 | 2021-07-13 | 上海新力动力设备研究所 | Test method and system for generating mechanical excitation through electromagnetic driving |
| CN113141613B (en) * | 2021-04-27 | 2023-09-26 | 上海淇玥信息技术有限公司 | Communication channel detection method and device and electronic equipment |
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Application publication date: 20190531 |
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