CN108336720A

CN108336720A - Single-phase earthing traveling-wave protection method and device and computer equipment

Info

Publication number: CN108336720A
Application number: CN201810066880.0A
Authority: CN
Inventors: 董新洲; 贾琦; 施慎行
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2017-12-18
Filing date: 2018-01-24
Publication date: 2018-07-27
Anticipated expiration: 2038-01-24
Also published as: CN108336720B

Abstract

The present invention provides a kind of single-phase earthing traveling-wave protection method and devices and computer equipment.Wherein, method includes：It is disturbed when traveling wave occurs for circuit, judges whether disturbance is happened at the non-transformer end of circuit switching electric appliance；When judging to disturb the non-transformer end for being happened at relay, judge whether relay non-transformer end occurs singlephase earth fault；When judgement generation singlephase earth fault, trip signal is sent out based on the time delays adjusted according to stepped principle；If the relay sends out trip signal according to trip signal, the relay of the circuit non-transformer side will send out trip signal according to the situation of change of the three-phase main-frequency electrical quantity detected.Technical solution through the invention; realize power line protection successive Trip; quickly selectively from two tip cut-off singlephase earth fault of circuit; condition is provided for the power supply of fast quick-recovery regular link; improve power circuit operational reliability; and communication port is not needed, there is good economy and practicability.

Description

Single-phase earthing traveling-wave protection method and device and computer equipment

This application claims being submitted on December 18th, 2017, Patent Office of the People's Republic of China, application No. is 201711367445.3, inventions The priority of the Chinese patent application of entitled " single-phase earthing traveling-wave protection method and device and computer equipment ", in whole Appearance is hereby incorporated by reference in the application.

Technical field

The present invention relates to protecting electrical power systems and control technology field, are protected in particular to a kind of single-phase earthing traveling wave Maintaining method, a kind of single-phase earthing traveling-wave protection device, a kind of computer equipment, a kind of computer readable storage medium.

Background technology

Most of existing distribution network protection technology uses traditional overcurrent protection adjusted according to trapezoidal principle.This skill Art is suitable on China widely applied single supply radial multistage branch power lines road.

However, at present the power network neutral point in China mostly use greatly it is earth-free or through grounding through arc, i.e. neutral point Non-effectively earthed system.In this distribution system, when singlephase earth fault occurs, fault current amplitudes very little, to failure Detection and traditional overcurrent protection cause prodigious challenge.There is presently no quickly selectively one-phase ground protection, and it is single After phase earth fault occurs, the raising of phase voltage may lead to apparatus insulated breakdown, be further development of phase-to phase fault, so It should give and timely identify and handle.

Existing power line protection technology includes current protection based on single-end electrical quantity, voltage protection and apart from guarantor Shield, current differential protection, Unit protection based on Two-Terminal Electrical Quantities etc..But after power circuit breaks down, failure Transient state travelling wave information afterwards all includes the fault messages such as failure generation, the position of fault as power frequency stable state electrical quantity.It is based on Transient fault traveling wave information similarly may be constructed power line protection.And the protection technique ratio based on transient state travelling wave is based on power frequency The protection technique of stable state has inborn rapidity.Therefore, research the relay protection based on transient state travelling wave can favorably promote after The development of electric protection technology.

Fault message based on transient state travelling wave has been used for constructing traveling-wave protection, travelling wave ranging and traveling wave route selection, has obtained Some progress.But the existing protection technique based on traveling wave information also has the deficiency of its own, such as due to being difficult to differentiate between event Hinder the traveling wave generated and the system disturbance such as lightning stroke traveling wave that even switching manipulation generates and be easy to malfunction, in multistage branch power lines It cannot be from two tip cut-off failure of faulty line in road.

Therefore, how a kind of single-phase ground protection method of traveling-wave protection of the comprehensive utilization based on Polarity comparision is provided, It can be quickly selectively from two tip cut-off of faulty line in the system with non effectively earth ed neutral on the road of branch power lines containing multistage Singlephase earth fault becomes a technical problem to be solved urgently.

Invention content

The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.

For this purpose, it is an aspect of the invention to propose a kind of single-phase earthing traveling-wave protection method.

Another aspect of the present invention is to propose a kind of single-phase earthing traveling-wave protection device.

Another aspect of the invention is to propose a kind of computer equipment.

Another aspect of the present invention is to propose a kind of computer readable storage medium.

In view of this, the present invention proposes a kind of single-phase earthing traveling-wave protection method, including：It is disturbed when traveling wave occurs for circuit It is dynamic, judge whether disturbance is happened at the non-transformer end of relay；When judgement disturbance is happened at the non-transformer end of relay, judge after Whether the non-transformer end of electric appliance occurs singlephase earth fault；When judgement generation singlephase earth fault, based on according to stepped principle The time adjusted sends out trip signal；If the relay sends out trip signal according to trip signal, the circuit non-transformer side after Electric appliance will send out trip signal according to the situation of change of the three-phase main-frequency electrical quantity detected.

After power circuit breaks down, electric system enters stable state after failure after transient process.Transient state after failure Traveling wave information and stable state power frequency information are all a parts for phenomenon of the failure, also can faults, wherein transient state travelling wave information is anti- The microcosmic situation after AC system breaks down is reflected, system is macro after stable state power frequency message reflection AC system breaks down See situation.It will be generated after power circuit breaks down, in system from fault point at the beginning of the fault traveling wave of Systematic Communication, failure The wave that begins only is influenced by electrical equipment on the path passed through, and the electrical equipment that traveling wave is not passed through not yet in by system is influenced, Therefore, in measurement point, initial traveling wave is not influenced by neutral grounding mode.In addition, when the pros of our specified current flow traveling waves To when being directed toward next circuit for busbar, after protected circuit breaks down, the initial current that mains side relay test arrives is electric Pressure polarity of traveling wave is on the contrary, the relay test initial current voltage traveling wave polarity that arrives in non-transformer side is identical.

Single-phase earthing traveling-wave protection method according to the present invention, neutral point on the road of branch power lines containing multistage is non-effective to be connect Either branch circuit (i.e. the radial distribution line of single ended power supply of single breaker disjunction) in ground system is protected based on detection The traveling wave electric amount at circuit both ends judges whether disturbed on protected circuit, if being disturbed, is based on initial traveling wave Polarity comparision, judge disturbance be happened at relay which side, if being happened at the non-transformer end of relay, based on power frequency it is electrical Amount, judges whether relay non-transformer end has occurred singlephase earth fault, and be distinguish to failure and disturbance, if relay Singlephase earth fault has occurred in non-transformer end, then based on the time delays waiting action adjusted according to stepped principle, works as the time The shortest relay of delayed setting takes the lead in after tripping, and faulty line is removed from mains side, the non-transformer side relay of opposite end Using the situation of change for the three-phase main-frequency electrical quantity experienced specifically, non-transformer side relay will detect that three-phase current has Valid value levels off to zero, in this, as criterion, sends out trip signal, is cut off from non-transformer side by faulty line.Through the invention Single-phase earthing traveling-wave protection method can not only that accurately and quickly detect singlephase earth fault, and can be quickly selective Power line protection successive Trip is realized in ground from two tip cut-off singlephase earth fault of faulty line, is that fast quick-recovery is normal Line powering provides condition, improves power circuit operational reliability, and do not need communication port, has good economy and reality The property used.

Traveling wave in the present invention refers to that running power equipment passes in the power system caused by being disturbed The electromagnetic wave broadcast.

In the above-mentioned technical solutions, it is preferable that according to the time that stepped principle is adjusted, specially：According to relay with Corresponding setting time is arranged in the distance of power supply；Wherein, distance is closer, and setting time is longer.

In the technical scheme, relay is closer apart from power supply, corresponding to setting time it is longer.If system occurs Traveling wave disturbance judges that disturbance is happened at which end of relay if being happened at relay non-transformer end judges relay without electricity When whether source has occurred singlephase earth fault, if singlephase earth fault has occurred, each such relay will be according to corresponding Setting time delay after act, after the shortest relay of being delayed sends out trip signal, faulty line is removed from mains side, The non-transformer side relay of its other side utilizes the situation of change for the three-phase main-frequency electrical quantity experienced, to send out trip signal, It is cut off from non-transformer side by faulty line.To realize power line protection successive Trip, that accurately and quickly detect Singlephase earth fault, quickly selectively from two tip cut-off singlephase earth fault of circuit.

In any of the above-described technical solution, it is preferable that this method further includes：The three-phase voltage row at acquisition circuit both ends in real time Wave and three-phase current traveling wave；Three-phase voltage traveling wave analog quantity or three-phase current traveling wave analog quantity are compared with predetermined threshold value, If three-phase voltage traveling wave analog quantity or three-phase current traveling wave analog quantity are more than predetermined threshold value, judge that traveling wave disturbance occurs.

In the technical scheme, in real time according to three-phase electricity on preset sample frequency (such as 1Mhz) synchronous acquisition protected circuit Press traveling wave and three-phase current traveling wave；The analog input level of real-time three-phase voltage traveling wave or three-phase current traveling wave is more electric Road judges traveling wave disturbance whether has occurred in system compared with predetermined threshold value.Wherein, the setting of threshold value can be 200mv.Tool For body, when three-phase voltage traveling wave analog quantity or three-phase voltage traveling wave analog quantity are more than predetermined threshold value, then decision-making system occurs Traveling wave disturbs.

It should be appreciated by those skilled in the art that sample frequency is 1Mhz, but not limited to this；Predetermined threshold value is 200mv, but not It is limited to this.

In any of the above-described technical solution, it is preferable that the step of whether disturbance is happened at the non-transformer end of relay judged, Including：Storing initial three-phase voltage traveling wave and initial three-phase current traveling wave respectively calculate three-phase voltage traveling wave modulus and three-phase electricity Flow traveling wave modulus；Three-phase voltage traveling wave modulus and three-phase current traveling wave modulus are subjected to four layers of wavelet transformation respectively, respectively basis Respective wavelet transform result extracts corresponding wavelet modulus maxima；Three-phase voltage traveling wave to each layer in four layers respectively The wavelet modulus maxima of modulus carries out Polarity comparision with the wavelet modulus maxima of corresponding three-phase current traveling wave modulus； If having the polarity of the wavelet modulus maxima of at least three layers of three-phase voltage traveling wave modulus and corresponding three-phase current traveling wave mould The polarity of the wavelet modulus maxima of amount is on the contrary, then judge that disturbance is happened at the non-transformer end of relay.

In any of the above-described technical solution, it is preferable that three-phase voltage traveling wave modulus includes three-phase voltage traveling wave Aerial mode component And/or three-phase voltage traveling wave zero _exit, three-phase current traveling wave modulus include three-phase current traveling wave Aerial mode component and/or three-phase electricity Popular wave zero _exit.

In the technical scheme, if monitoring that traveling wave disturbance has occurred in system, to three-phase voltage traveling wave modulus and three-phase Current traveling wave modulus carries out four layers of wavelet transformation respectively, and the primary of the optional cubic B-spline function of wavelet function herein leads letter Number.Corresponding modulus maximum is extracted according to respective wavelet transform result.By comparing four layers of wavelet transformation of voltage traveling wave modulus The polarity of modulus maximum and corresponding four layers of wavelet modulus maxima of current traveling wave modulus, come judge disturbance whether be happened at after The non-transformer end of electric appliance.

If specifically, monitoring that traveling wave disturbance, storing initial three-phase voltage traveling wave and initial three-phase have occurred in system Current traveling wave, such as in front and back each 64 point data of disturbance.Phase-model transformation is carried out to three-phase voltage traveling wave, phase-model transformation matrix is using triumphant Human relations Bell's matrix, to obtain three-phase voltage traveling wave Aerial mode component and three-phase voltage traveling wave zero _exit.Similarly, to three-phase current Traveling wave carries out phase-model transformation, and transformation matrix uses triumphant human relations Bell matrix, to obtain three-phase current traveling wave Aerial mode component and three-phase Current traveling wave zero _exit.

Four layers of four layers of wavelet modulus maxima of comparison voltage traveling wave Aerial mode component and corresponding current traveling wave Aerial mode component The polarity of wavelet modulus maxima, if there is the voltage traveling wave Aerial mode component for being no less than three layers and corresponding current traveling wave line mould The wavelet modulus maxima polarity of component is on the contrary, then judge that disturbance is happened at relay non-transformer end；Alternatively, comparison voltage row Four layers of wavelet modulus maxima of four layers of wavelet modulus maxima of wave zero _exit and corresponding current traveling wave zero _exit Polarity, if there is being no less than three layers of voltage traveling wave zero _exit and the wavelet modulus maxima pole of current traveling wave zero _exit Property on the contrary, then judge disturbance be happened at relay non-transformer end；If above-mentioned be all unsatisfactory for, judgement disturbance is happened at by protective wire Other than road.Technical solution through the invention can be distinguish singlephase earth fault and disturbance, so as to avoid related skill Traveling wave and the system disturbance such as the lightning stroke even traveling wave of switching manipulation generation and being easy to malfunction of failure generation are difficult to differentiate between in art Problem.

It should be appreciated by those skilled in the art that three-phase voltage traveling wave and three-phase current the traveling wave disturbance acquired in real time is front and back each 64 point datas, one of the transient state travelling wave data only after failure, but the transient state travelling wave data after failure are without being limited thereto.

In any of the above-described technical solution, it is preferable that judge whether the non-transformer end of relay occurs singlephase earth fault The step of, including：The three-phase main-frequency voltage and three-phase main-frequency electric current at acquisition circuit both ends in real time；Storing initial three-phase main-frequency respectively Voltage and initial three-phase main-frequency electric current, and phase sequence change is carried out respectively to initial three-phase main-frequency voltage and initial three-phase main-frequency electric current It changes, obtains the virtual value of power frequency residual voltage and the virtual value of three-phase main-frequency electric current；Compare power frequency residual voltage virtual value and electricity Repoussage definite value judges that ground connection event occurs for the non-transformer end of relay if power frequency residual voltage virtual value is more than voltage setting valve Barrier；When the non-transformer end generation earth fault of judgement relay, compare the virtual value and current setting of three-phase main-frequency electric current, if The virtual value of each phase power current is below current setting in three-phase main-frequency electric current, then judges the non-transformer end hair of relay Raw singlephase earth fault.

After earth fault occurs for power circuit, notable change has occurred in the stable state power frequency quality after failure compared with before failure Change.Before failure, three-phase symmetrical, wherein three-phase voltage are symmetrical, maintain near rated voltage；Three-phase current is load current, nothing Notable residual voltage and zero-sequence current.After failure, significant changes will occur in voltage and current.In system with non effectively earth ed neutral, After singlephase earth fault, residual voltage increases, and perfects the raising of phase phase voltage, the short trouble in addition to single-phase earthing, failure phase Electric current increases, and faulted phase voltage reduces.

In the technical scheme, if monitoring, traveling wave disturbance has occurred in relay non-transformer end, and storage acquires first in real time Beginning three-phase main-frequency voltage and initial three-phase main-frequency electric current, such as 24 point datas after disturbing.To three-phase main-frequency voltage and three-phase main-frequency electricity Stream carries out Phase-Sequence Transformation respectively, obtains positive and negative, 03 order components of three-phase main-frequency voltage, and Fourier transformation is recycled to ask respectively Take the virtual value of power frequency residual voltage and the virtual value of three-phase main-frequency electric current.It is adjusted with voltage by comparing residual voltage virtual value Value judges that earth fault has occurred in the non-transformer end of relay if residual voltage virtual value is more than voltage setting valve；In turn Compare three-phase current virtual value and current setting, if three-phase current virtual value is below current setting, judges relay Singlephase earth fault has occurred in the non-transformer end of device.

It should be appreciated by those skilled in the art that 24 points after the three-phase main-frequency voltage and three-phase main-frequency current disturbing that acquire in real time Data, one of stable state power frequency data only after failure, but the stable state power frequency data after failure are without being limited thereto.

In any of the above-described technical solution, it is preferable that voltage setting valve is equal to the residual voltage under system normal operation The product of upper critical value and the first predetermined coefficient；Current setting be equal to system normal operation under load current upper critical value with The product of second predetermined coefficient.

In the technical scheme, voltage setting valve is according to the maximum residual voltage width being likely to occur under system normal operation Value, which is multiplied with a safety factor, adjusts, and current setting is according to the maximum load current being likely to occur under system normal operation It is multiplied with another safety factor and to adjust.

The invention also provides a kind of single-phase earthing traveling-wave protection devices, including：Unit is disturbed, is gone for working as circuit Wave disturbance, judges whether disturbance is happened at the non-transformer end of circuit switching electric appliance；Trouble unit, for being happened at when judgement disturbance The non-transformer end of relay, judges whether the non-transformer end of relay occurs singlephase earth fault；Protection location, for when judgement Singlephase earth fault occurs, trip signal is sent out based on the time adjusted according to stepped principle；Protection location, if be additionally operable to after Electric appliance sends out trip signal according to trip signal, and the relay of circuit non-transformer side will be electrical according to the three-phase main-frequency detected The situation of change of amount, sends out trip signal.

Single-phase earthing traveling-wave protection device according to the present invention, neutral point on the road of branch power lines containing multistage is non-effective to be connect Either branch circuit (i.e. the radial distribution line of single ended power supply of single breaker disjunction) in ground system is protected based on detection The traveling wave electric amount at circuit both ends judges whether disturbed on protected circuit, if being disturbed, is based on initial traveling wave Polarity comparision, judge disturbance be happened at relay which side, if being happened at the non-transformer end of relay, based on power frequency it is electrical Amount, judges whether relay non-transformer end has occurred singlephase earth fault, and be distinguish to failure and disturbance, if relay Singlephase earth fault has occurred in non-transformer end, then based on the time delays waiting action adjusted according to stepped principle, works as the time The shortest relay of delayed setting takes the lead in after tripping, and faulty line is removed from mains side, the non-transformer side relay of opposite end Using the situation of change for the three-phase main-frequency electrical quantity experienced specifically, non-transformer side relay will detect that three-phase current has Valid value levels off to zero, in this, as criterion, sends out trip signal, is cut off from non-transformer side by faulty line.Through the invention Single-phase earthing traveling-wave protection method can not only that accurately and quickly detect singlephase earth fault, and can be quickly selective Power line protection successive Trip is realized in ground from two tip cut-off singlephase earth fault of faulty line, is that fast quick-recovery is normal Line powering provides condition, improves power circuit operational reliability, and do not need communication port, has good economy and reality The property used.

In the above-mentioned technical solutions, it is preferable that according to the time that stepped principle is adjusted, specially：According to relay with Corresponding setting time is arranged in the distance of power supply, wherein distance is closer, setting time is longer.

In any of the above-described technical solution, it is preferable that disturbance unit is specifically used for：The three-phase at acquisition circuit both ends in real time Voltage traveling wave and three-phase current traveling wave；Three-phase voltage traveling wave analog quantity or three-phase current traveling wave analog quantity are carried out with predetermined threshold value Compare, if three-phase voltage traveling wave analog quantity or three-phase current traveling wave analog quantity are more than predetermined threshold value, judges that traveling wave disturbance occurs.

In any of the above-described technical solution, it is preferable that disturbance unit is specifically additionally operable to：Storing initial three-phase voltage respectively Traveling wave and initial three-phase current traveling wave calculate three-phase voltage traveling wave modulus and three-phase current traveling wave modulus；Three-phase electricity is obtained respectively Press traveling wave modulus and corresponding three-phase current traveling wave modulus, by three-phase voltage traveling wave modulus and three-phase current traveling wave modulus respectively into Four layers of wavelet transformation of row extract corresponding wavelet modulus maxima according to respective wavelet transform result respectively；Respectively to four The small echo of the wavelet modulus maxima and corresponding three-phase current traveling wave modulus of each layer of three-phase voltage traveling wave modulus in layer It converts modulus maximum and carries out Polarity comparision；If there is the pole of the wavelet modulus maxima of at least three layers of three-phase voltage traveling wave modulus Property with the polarity of the wavelet modulus maxima of corresponding three-phase current traveling wave modulus on the contrary, then judge disturbance be happened at relay Non-transformer end.

In any of the above-described technical solution, it is preferable that trouble unit is specifically used for：The three-phase at acquisition circuit both ends in real time Power-frequency voltage and three-phase main-frequency electric current；Storing initial three-phase main-frequency voltage and initial three-phase main-frequency electric current respectively, and to initial three Phase power-frequency voltage and initial three-phase main-frequency electric current carry out Phase-Sequence Transformation respectively, obtain the virtual value and three-phase work of power frequency residual voltage The virtual value of frequency electric current；Compare three-phase main-frequency residual voltage virtual value and voltage setting valve, if power frequency residual voltage virtual value is big In voltage setting valve, then judge that singlephase earth fault occurs for the non-transformer end of relay；When the non-transformer end hair of judgement relay Raw earth fault, compares the virtual value and current setting of three-phase main-frequency electric current, if each phase power frequency electric in three-phase main-frequency electric current The virtual value of stream is below current setting, then judges that singlephase earth fault occurs for the non-transformer end of relay.

After earth fault occurs for power circuit, notable change has occurred in the stable state power frequency quality after failure compared with before failure Change.Before failure, three-phase symmetrical, wherein three-phase voltage are symmetrical, maintain near rated voltage；Three-phase current is load current, nothing Residual voltage and zero-sequence current.After failure, significant changes will occur in voltage and current.It is single-phase in system with non effectively earth ed neutral After earth fault, residual voltage increases, and perfects the raising of phase phase voltage, the short trouble in addition to single-phase earthing, faulted phase current It increases, faulted phase voltage reduces.

In the technical scheme, if monitoring, traveling wave disturbance has occurred in relay non-transformer end, and storage acquires first in real time Beginning three-phase main-frequency voltage and initial three-phase main-frequency electric current, such as 24 point datas after disturbing.To three-phase main-frequency voltage and three-phase main-frequency electricity Stream carries out Phase-Sequence Transformation respectively, obtains positive and negative, 03 order components of three-phase main-frequency voltage respectively, recycles Fourier transformation point The virtual value of power frequency residual voltage and the virtual value of three-phase main-frequency electric current are not sought.By comparing residual voltage virtual value and voltage Setting valve judges that earth fault has occurred in the non-transformer end of relay if residual voltage virtual value is more than voltage setting valve； And then compare three-phase current virtual value and current setting, if three-phase current virtual value is below current setting, judge Singlephase earth fault has occurred in the non-transformer end of relay.

The third aspect of the present invention, it is proposed that a kind of computer equipment, including memory, processor and it is stored in memory Computer program that is upper and can running on a processor, processor are used to execute the step such as any one of above-mentioned technical proposal method Suddenly.

Computer equipment according to the present invention, including processor for executing as single in any of the above-described technical solution Mutually the step of ground connection traveling-wave protection method, thus the computer equipment can realize the whole of the single-phase earthing traveling-wave protection method Advantageous effect, details are not described herein.

The fourth aspect of the present invention, it is proposed that a kind of computer readable storage medium is stored thereon with computer program, meter Calculation machine program is realized when being executed by processor such as the step of any one of above-mentioned technical proposal method.

Computer readable storage medium according to the present invention, the computer program stored thereon are realized when being executed by processor As in any of the above-described technical solution the step of single-phase earthing traveling-wave protection method, thus the computer readable storage medium can Realize whole advantageous effects of the single-phase earthing traveling-wave protection method, details are not described herein.

The additional aspect and advantage of the present invention will become apparent in following description section, or practice through the invention Recognize.

Description of the drawings

The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment Obviously and it is readily appreciated that, wherein：

Fig. 1 shows the flow diagram of single-phase earthing traveling-wave protection method according to an embodiment of the invention；

Fig. 2 shows the flow diagrams of single-phase earthing traveling-wave protection method according to another embodiment of the invention；

Fig. 3 shows the flow diagram of single-phase earthing traveling-wave protection method according to still a further embodiment；

Fig. 4 shows the flow diagram of single-phase earthing traveling-wave protection method according to still another embodiment of the invention；

Fig. 5 shows the flow diagram of single-phase earthing traveling-wave protection method according to still another embodiment of the invention；

Fig. 6 shows the schematic block diagram of single-phase earthing traveling-wave protection device according to an embodiment of the invention；

Fig. 7 shows the schematic block diagram of computer equipment according to an embodiment of the invention.

Specific implementation mode

To better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real Mode is applied the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application Feature in example and embodiment can be combined with each other.

Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also To be implemented different from other modes described here using other, therefore, protection scope of the present invention is not by described below Specific embodiment limitation.

As shown in Figure 1, the flow diagram of single-phase earthing traveling-wave protection method according to an embodiment of the invention.Its In, this method includes：

Step 102, it is disturbed when traveling wave occurs for circuit, judges whether disturbance is happened at relay non-transformer end；

Step 104, when judgement disturbance is happened at the non-transformer end of relay, judge whether relay non-transformer end occurs list Phase earth fault；

Step 106, when singlephase earth fault occurs for judgement, sending out tripping based on the time adjusted according to stepped principle believes Number；

Step 108, if relay sends out trip signal according to trip signal, the relay of the circuit non-transformer side will root According to the situation of change of the three-phase main-frequency electrical quantity detected, trip signal is sent out.

Single-phase earthing traveling-wave protection method provided by the invention, neutral point on the road of branch power lines containing multistage is non-effective to be connect Either branch circuit (i.e. the radial distribution line of single ended power supply of single breaker disjunction) in ground system is protected based on detection The traveling wave electric amount at circuit both ends judges whether disturbed on protected circuit, if being disturbed, is based on initial traveling wave Polarity comparision, judge disturbance be happened at relay which side, if being happened at the non-transformer end of relay, based on power frequency it is electrical Amount, judges whether relay non-transformer end has occurred singlephase earth fault, and be distinguish to failure and disturbance, if relay Singlephase earth fault has occurred in non-transformer end, then based on the time delays waiting action adjusted according to stepped principle, works as the time The shortest relay of delayed setting takes the lead in after tripping, and faulty line is removed from mains side, the non-transformer side relay of opposite end Using the situation of change for the three-phase main-frequency electrical quantity experienced specifically, non-transformer side relay will detect that three-phase current has Valid value levels off to zero, in this, as criterion, sends out trip signal, is cut off from non-transformer side by faulty line.Through the invention Single-phase earthing traveling-wave protection method can not only that accurately and quickly detect singlephase earth fault, and can be quickly selective Power line protection successive Trip is realized in ground from two tip cut-off singlephase earth fault of faulty line, is that fast quick-recovery is normal Line powering provides condition, improves power circuit operational reliability, and do not need communication port, has good economy and reality The property used.

Traveling wave in the embodiment of the present invention refers to running power equipment caused by being disturbed in power train The electromagnetic wave propagated in system.

In the above embodiment, it is preferable that according to the time that stepped principle is adjusted, specially：According to relay and electricity Corresponding setting time is arranged in the distance in source, wherein distance is closer, setting time is longer.

In this embodiment, relay is closer apart from power supply, corresponding to setting time it is longer.If system has occurred Traveling wave disturbs, and judges to disturb which end for being happened at relay judges relay non-transformer if being happened at relay non-transformer end When whether end has occurred singlephase earth fault, if singlephase earth fault has occurred, each such relay will be according to corresponding It acting after setting time delay, after the shortest relay that is delayed sends out trip signal, faulty line is removed from mains side, The non-transformer side relay of the other side utilizes the situation of change for the three-phase main-frequency electrical quantity experienced, to send out trip signal, from Non-transformer side cuts off faulty line.To realize power line protection successive Trip, list is that accurately and quickly detected Phase earth fault, quickly selectively from two tip cut-off singlephase earth fault of circuit.

As shown in Fig. 2, the flow diagram of single-phase earthing traveling-wave protection method according to another embodiment of the invention. Wherein, this method includes：

Step 202, the three-phase voltage traveling wave and three-phase current traveling wave at circuit both ends are acquired in real time；

Step 204, three-phase voltage traveling wave analog quantity or three-phase current traveling wave analog quantity are compared with predetermined threshold value；

Step 206, if three-phase voltage traveling wave analog quantity or three-phase current traveling wave analog quantity are more than predetermined threshold value, judge to send out Raw traveling wave disturbance；

Step 208, judge whether disturbance is happened at the non-transformer end of relay；

Step 210, when judgement disturbance is happened at the non-transformer end of relay, judge whether the non-transformer end of relay occurs Singlephase earth fault；

Step 212, when singlephase earth fault occurs for judgement, sending out tripping based on the time adjusted according to stepped principle believes Number；

Step 214, if relay sends out trip signal according to trip signal, the relay of the circuit non-transformer side will root According to the situation of change of the three-phase main-frequency electrical quantity detected, trip signal is sent out.

In this embodiment, in real time according to three-phase voltage on preset sample frequency (such as 1Mhz) synchronous acquisition protected circuit Traveling wave and three-phase current traveling wave；By real-time three-phase voltage traveling wave or the analog input level comparison circuit of three-phase current traveling wave, Compared with predetermined threshold value, judge traveling wave disturbance whether has occurred in system.Wherein, the setting of threshold value can be 200mv.It is specific and Speech, when three-phase voltage traveling wave analog quantity or three-phase voltage traveling wave analog quantity are more than predetermined threshold value, then traveling wave occurs for decision-making system Disturbance.

As shown in figure 3, the flow diagram of single-phase earthing traveling-wave protection method according to still a further embodiment. Wherein, this method includes：

Step 302, the three-phase voltage traveling wave and three-phase current traveling wave at circuit both ends are acquired in real time；

Step 304, three-phase voltage traveling wave analog quantity or three-phase current traveling wave analog quantity are compared with predetermined threshold value；

Step 306, if three-phase voltage traveling wave analog quantity or three-phase current traveling wave analog quantity are more than predetermined threshold value, judge to send out Raw traveling wave disturbance；

Step 308, difference storing initial three-phase voltage traveling wave and initial three-phase current traveling wave calculate three-phase voltage traveling wave mould Amount and three-phase current traveling wave modulus；

Step 310, three-phase voltage traveling wave modulus and three-phase current traveling wave modulus are subjected to four layers of wavelet transformation respectively, respectively Corresponding wavelet modulus maxima is extracted according to respective wavelet transform result；

Step 312, respectively to the wavelet modulus maxima of each layer of three-phase voltage traveling wave modulus in four layers with it is corresponding Three-phase current traveling wave modulus wavelet modulus maxima carry out Polarity comparision；

Step 314, if having the polarity of the wavelet modulus maxima of at least three layers of three-phase voltage traveling wave modulus with it is corresponding Three-phase current traveling wave modulus wavelet modulus maxima polarity on the contrary, then judging that disturbance is happened at the non-transformer of relay End；

Step 316, when judgement disturbance is happened at the non-transformer end of relay, judge whether the non-transformer end of relay occurs Singlephase earth fault；

Step 318, when judging generation singlephase earth fault, tripping letter is sent out based on the time adjusted according to stepped principle Number；

Step 320, if relay sends out trip signal according to trip signal, the relay of the circuit non-transformer side will root According to the situation of change of the three-phase main-frequency electrical quantity detected, trip signal is sent out.

In any of the above-described embodiment, it is preferable that three-phase voltage traveling wave modulus include three-phase voltage traveling wave Aerial mode component and/ Or three-phase voltage traveling wave zero _exit, three-phase current traveling wave modulus include three-phase current traveling wave Aerial mode component and/or three-phase current Traveling wave zero _exit.

In this embodiment, if monitoring that traveling wave disturbance has occurred in system, to three-phase voltage traveling wave modulus and three-phase electricity Stream traveling wave modulus carries out four layers of wavelet transformation respectively, a derived function of the optional cubic B-spline function of wavelet function herein. Corresponding modulus maximum is extracted according to respective wavelet transform result.By comparing four layers of WAVELET TRANSFORM MODULUS pole of voltage traveling wave modulus Big value and the polarity of corresponding four layers of wavelet modulus maxima of current traveling wave modulus, to judge whether disturbance is happened at relay Non-transformer end.

Four layers of four layers of wavelet modulus maxima of comparison voltage traveling wave Aerial mode component and corresponding current traveling wave Aerial mode component The polarity of wavelet modulus maxima, if there is the voltage traveling wave Aerial mode component for being no less than three layers and corresponding current traveling wave line mould The wavelet modulus maxima polarity of component is on the contrary, then judge that disturbance is happened at relay non-transformer end；Alternatively, comparison voltage row Four layers of wavelet modulus maxima of four layers of wavelet modulus maxima of wave zero _exit and corresponding current traveling wave zero _exit Polarity, if there is being no less than three layers of voltage traveling wave zero _exit and the wavelet modulus maxima pole of current traveling wave zero _exit Property on the contrary, then judge disturbance be happened at relay non-transformer end；If above-mentioned be all unsatisfactory for, judgement disturbance is happened at by protective wire Other than road.Embodiment through the invention can be distinguish singlephase earth fault and disturbance, so as to avoid the relevant technologies In be difficult to differentiate between failure generation traveling wave and system disturbance as lightning stroke even switching manipulation generate traveling wave and be easy to asking for malfunction Topic.

As shown in figure 4, the flow diagram of single-phase earthing traveling-wave protection method according to still another embodiment of the invention. Wherein, this method includes：

Step 402, the three-phase voltage traveling wave and three-phase current traveling wave and three-phase main-frequency voltage at real-time acquisition circuit both ends With three-phase main-frequency electric current；

Step 404, three-phase voltage traveling wave analog quantity or three-phase current traveling wave analog quantity are compared with predetermined threshold value；

Step 406, if three-phase voltage traveling wave analog quantity or three-phase current traveling wave analog quantity are more than predetermined threshold value, judge be Traveling wave disturbance occurs for system；

Step 408, difference storing initial three-phase voltage traveling wave and initial three-phase current traveling wave calculate three-phase voltage traveling wave mould Amount and three-phase current traveling wave modulus；

Step 410, three-phase voltage traveling wave modulus and three-phase current traveling wave modulus are subjected to four layers of wavelet transformation respectively, respectively Corresponding wavelet modulus maxima is extracted according to respective wavelet transform result；

Step 412, respectively to the wavelet modulus maxima of each layer of three-phase voltage traveling wave modulus in four layers with it is corresponding Three-phase current traveling wave modulus wavelet modulus maxima carry out Polarity comparision；

Step 414, if having the polarity of the wavelet modulus maxima of at least three layers of three-phase voltage traveling wave modulus with it is corresponding Three-phase current traveling wave modulus wavelet modulus maxima polarity on the contrary, then judging that disturbance is happened at the non-transformer of relay End；

Step 416, difference storing initial three-phase main-frequency voltage and initial three-phase main-frequency electric current, and to initial three-phase main-frequency electricity Pressure and initial three-phase main-frequency electric current carry out Phase-Sequence Transformation respectively, obtain the virtual value and three-phase main-frequency electric current of power frequency residual voltage Virtual value；

Step 418, compare power frequency residual voltage virtual value and voltage setting valve, if power frequency residual voltage virtual value is more than electricity Repoussage definite value then judges that earth fault occurs for the non-transformer end of relay；

Step 420, compare the virtual value and current setting of three-phase main-frequency electric current, if each phase work in three-phase main-frequency electric current The virtual value of frequency electric current is below current setting, then judges that singlephase earth fault occurs for the non-transformer end of relay；

Step 422, trip signal is sent out based on the time adjusted according to stepped principle；

Step 424, if relay sends out trip signal according to trip signal, the relay of circuit non-transformer side will basis The situation of change of the three-phase main-frequency electrical quantity detected, sends out trip signal.

In this embodiment, if monitoring, traveling wave disturbance has occurred in relay non-transformer end, and storage acquires initial in real time Three-phase main-frequency voltage and initial three-phase main-frequency electric current, such as 24 point datas after disturbing.To three-phase main-frequency voltage and three-phase main-frequency electric current Phase-Sequence Transformation is carried out respectively, obtains positive and negative, 03 order components of three-phase main-frequency voltage, and Fourier transformation is recycled to seek respectively The virtual value of power frequency residual voltage and the virtual value of three-phase main-frequency electric current.It is adjusted with voltage by comparing residual voltage virtual value Value judges that earth fault has occurred in the non-transformer end of relay if residual voltage virtual value is more than voltage setting valve；In turn Compare three-phase current virtual value and current setting, if three-phase current virtual value is below current setting, judges relay Singlephase earth fault has occurred in the non-transformer end of device.

In any of the above-described embodiment, it is preferable that voltage setting valve is equal to the upper of the residual voltage under system normal operation The product of critical value and the first predetermined coefficient；Current setting is equal to the upper critical value and the of the load current under system normal operation The product of two predetermined coefficients.

In this embodiment, voltage setting valve is according to the maximum residual voltage amplitude being likely to occur under system normal operation Be multiplied with a safety factor and to adjust, current setting according to the maximum load current being likely to occur under system normal operation with The multiplication of another safety factor is adjusted.

Specific embodiment：A kind of power circuit single-phase ground protection method of system with non effectively earth ed neutral is provided, As shown in figure 5, this method specifically includes：

Step 502, protected circuit both ends traveling wave electric amount and power frequency quality are acquired in real time；

Step 504, it is based on traveling wave electric amount, judges traveling wave disturbance whether has occurred in system；

Step 506, when traveling wave disturbance has occurred in decision-making system, judge that disturbance is based on initial voltage current traveling wave polarity It is no to be happened at relay non-transformer end；

Step 508, it is happened at non-transformer end when judgement disturbs, is based on power frequency quality, judges that relay non-transformer end is It is no that singlephase earth fault has occurred；

Step 510, when singlephase earth fault, the time delays etc. that relay coordinates first, in accordance with step type have occurred in judgement It waits acting；

Step 512, after the shortest actuating of relay that is delayed is tripped, the relay of opposite end utilizes the three-phase work experienced The variation of frequency electrical quantity carrys out operational relay action.

Single-phase earthing traveling-wave protection method provided in an embodiment of the present invention, the neutral point on the road of branch power lines containing multistage are non- Either branch circuit (i.e. the distribution line of single breaker disjunction) in effectively earthed system, based on detection protected circuit both ends Traveling wave electric amount, judge whether disturbed on protected circuit, if being disturbed, the polarity ratio based on initial traveling wave Compared with, judge disturbance be happened at relay which side, if being happened at the non-transformer end of relay, be based on power frequency quality, judge after Whether electric appliance non-transformer end has occurred singlephase earth fault, and is distinguish to failure and disturbance, if relay non-transformer end Singlephase earth fault has occurred, then based on the time delays waiting action adjusted according to stepped principle, when time delayed setting Shorter relay takes the lead in after tripping, and the non-transformer side relay of faulty line opposite end utilizes the three-phase main-frequency electrical quantity experienced Situation of change, to send out trip signal.Single-phase earthing traveling-wave protection method through the invention, can not only be accurate and quick Ground detects singlephase earth fault, and can realize electricity quickly selectively from two tip cut-off singlephase earth fault of faulty line Power route protection successive Trip provides condition for the power supply of fast quick-recovery regular link, improves power circuit operational reliability, And communication port is not needed, there is good economy and practicability.

As shown in fig. 6, the schematic block diagram of single-phase earthing traveling-wave protection device according to an embodiment of the invention.Its In, which includes：

Unit 602 is disturbed, for traveling wave disturbance to occur when circuit, judges whether disturbance is happened at the non-transformer of relay End；

Trouble unit 604, the non-transformer end for being happened at relay when judgement disturbance, judges the non-transformer end of relay Whether singlephase earth fault is occurred；

Protection location 606, for singlephase earth fault to occur when judgement, based on the time hair adjusted according to stepped principle Go out trip signal；

Protection location 606, if be additionally operable to relay sends out trip signal, the relay of circuit non-transformer side according to trip signal Device will send out trip signal according to the situation of change of the three-phase main-frequency electrical quantity detected.

Single-phase earthing traveling-wave protection device 600 provided by the invention, neutral point on the road of branch power lines containing multistage is non-to be had The either branch circuit (i.e. the radial distribution line of single ended power supply of single breaker disjunction) in earthed system is imitated, based on detection quilt The traveling wave electric amount at protection circuit both ends judges whether disturbed on protected circuit, if being disturbed, based on initial The Polarity comparision of traveling wave judges that disturbance is happened at relay which side, if being happened at the non-transformer end of relay, is based on power frequency electric Tolerance, judges whether relay non-transformer end has occurred singlephase earth fault, and is distinguish to failure and disturbance, if relay Singlephase earth fault has occurred in device non-transformer end, then based on the time delays waiting action adjusted according to stepped principle, at that time Between the shortest relay of delayed setting take the lead in after tripping, faulty line is removed from mains side, the non-transformer side relay of opposite end Device is using the situation of change for the three-phase main-frequency electrical quantity experienced specifically, non-transformer side relay will detect that three-phase current Virtual value levels off to zero, in this, as criterion, sends out trip signal, is cut off from non-transformer side by faulty line.Through the invention Single-phase earthing traveling-wave protection method, can not only that accurately and quickly detect singlephase earth fault, and can quickly have selection Property from two tip cut-off singlephase earth fault of faulty line, realize power line protection successive Trip, be fast quick-recovery just Normal line powering provides condition, improves power circuit operational reliability, and do not need communication port, have good economy and Practicability.

In any of the above-described embodiment, it is preferable that disturbance unit 602 is specifically used for：The three-phase at acquisition circuit both ends in real time Voltage traveling wave and three-phase current traveling wave；Three-phase voltage traveling wave analog quantity or three-phase current traveling wave analog quantity are carried out with predetermined threshold value Compare, if three-phase voltage traveling wave analog quantity or three-phase current traveling wave analog quantity are more than predetermined threshold value, judges that traveling wave disturbance occurs.

In any of the above-described embodiment, it is preferable that disturbance unit 602 is specifically additionally operable to：Storing initial three-phase voltage respectively Traveling wave and initial three-phase current traveling wave calculate three-phase voltage traveling wave modulus and three-phase current traveling wave modulus；Three-phase electricity is obtained respectively Press traveling wave modulus and corresponding three-phase current traveling wave modulus, by three-phase voltage traveling wave modulus and three-phase current traveling wave modulus respectively into Four layers of wavelet transformation of row extract corresponding wavelet modulus maxima according to respective wavelet transform result respectively；Respectively to four The small echo of the wavelet modulus maxima and corresponding three-phase current traveling wave modulus of each layer of three-phase voltage traveling wave modulus in layer It converts modulus maximum and carries out Polarity comparision；If there is the pole of the wavelet modulus maxima of at least three layers of three-phase voltage traveling wave modulus Property with the polarity of the wavelet modulus maxima of corresponding three-phase current traveling wave modulus on the contrary, then judge disturbance be happened at relay Non-transformer end.

In any of the above-described embodiment, it is preferable that trouble unit 604 is specifically used for：The three-phase at acquisition circuit both ends in real time Power-frequency voltage and three-phase main-frequency electric current；Storing initial three-phase main-frequency voltage and initial three-phase main-frequency electric current respectively, and to initial three Phase power-frequency voltage and initial three-phase main-frequency electric current carry out Phase-Sequence Transformation respectively, obtain the virtual value and three-phase work of power frequency residual voltage The virtual value of frequency electric current；Compare three-phase main-frequency residual voltage virtual value and voltage setting valve, if power frequency residual voltage virtual value is big In voltage setting valve, then judge that singlephase earth fault occurs for the non-transformer end of relay；When the non-transformer end hair of judgement relay Raw earth fault, compares the virtual value and current setting of three-phase main-frequency electric current, if the virtual value of three-phase main-frequency electric current is below Current setting then judges that singlephase earth fault occurs for the non-transformer end of relay.

In this embodiment, if monitoring, traveling wave disturbance has occurred in relay non-transformer end, and storage acquires initial in real time Three-phase main-frequency voltage and initial three-phase main-frequency electric current, such as 24 point datas after disturbing.To three-phase main-frequency voltage and three-phase main-frequency electric current Phase-Sequence Transformation is carried out respectively, obtains positive and negative, 03 order components of three-phase main-frequency voltage respectively, recycles Fourier transformation difference Seek the virtual value of power frequency residual voltage and the virtual value of three-phase main-frequency electric current.It is whole by comparing residual voltage virtual value and voltage Definite value judges that earth fault has occurred in the non-transformer end of relay if residual voltage virtual value is more than voltage setting valve；Into And compare three-phase current virtual value and current setting, if three-phase current virtual value is below current setting, judgement after Singlephase earth fault has occurred in the non-transformer end of electric appliance.

As shown in fig. 7, the schematic diagram of computer equipment according to an embodiment of the invention.The wherein computer equipment 1, including memory 12, processor 14 and it is stored in the computer program that can be run on memory 12 and on processor 14, locate Device 14 is managed for executing such as the step of any one of above-described embodiment method.

Computer equipment 1 provided by the invention, including processor 14 for executing as in above-mentioned any embodiment The step of single-phase earthing traveling-wave protection method, thus the computer equipment 1 can realize the single-phase earthing traveling-wave protection method Whole advantageous effects, details are not described herein.

The fourth aspect of the present invention embodiment, it is proposed that a kind of computer readable storage medium is stored thereon with computer Program is realized when computer program is executed by processor such as the step of any one of above-described embodiment method.

Computer readable storage medium provided by the invention, the computer program stored thereon are realized when being executed by processor As in above-mentioned any embodiment the step of single-phase earthing traveling-wave protection method, thus the computer readable storage medium can be real Now whole advantageous effects of the single-phase earthing traveling-wave protection method, details are not described herein.

The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims

1. a kind of single-phase earthing traveling-wave protection method, which is characterized in that including：

It is disturbed when traveling wave occurs for circuit, judges whether disturbance is happened at the non-transformer end of the circuit switching electric appliance；

When judging to disturb the non-transformer end for being happened at the relay, it is single-phase to judge whether the non-transformer end of the relay occurs Earth fault；

When judgement generation singlephase earth fault, trip signal is sent out based on the time adjusted according to stepped principle；

If the relay sends out trip signal according to the trip signal, the relay of circuit non-transformer side will basis The situation of change of the three-phase main-frequency electrical quantity detected, sends out trip signal.

2. single-phase earthing traveling-wave protection method according to claim 1, which is characterized in that described whole according to stepped principle The fixed time, specially：

According to the relay, corresponding setting time is set at a distance from power supply, it is described when adjusting wherein the distance is closer Between it is longer.

3. single-phase earthing traveling-wave protection method according to claim 1, which is characterized in that the method further includes：

The three-phase voltage traveling wave and three-phase current traveling wave at the circuit both ends are acquired in real time；

The three-phase voltage traveling wave analog quantity or the three-phase current traveling wave analog quantity are compared with predetermined threshold value, if described Three-phase voltage traveling wave analog quantity or the three-phase current traveling wave analog quantity are more than the predetermined threshold value, then judge that traveling wave, which occurs, disturbs It is dynamic.

4. single-phase earthing traveling-wave protection method according to claim 1, which is characterized in that described to judge whether disturbance occurs The non-transformer end of the relay the step of, including：

Storing initial three-phase voltage traveling wave and initial three-phase current traveling wave respectively calculate the three-phase voltage traveling wave modulus and described Three-phase current traveling wave modulus；

The three-phase voltage traveling wave modulus and the three-phase current traveling wave modulus are subjected to four layers of wavelet transformation respectively, respectively basis Respective wavelet transform result extracts corresponding wavelet modulus maxima；

Respectively to the wavelet modulus maxima of each layer of three-phase voltage traveling wave modulus in four layers and corresponding three-phase electricity prevalence The wavelet modulus maxima of wave modulus carries out Polarity comparision；

If having the polarity and corresponding three-phase electricity of at least wavelet modulus maxima of three layers of the three-phase voltage traveling wave modulus The polarity of the wavelet modulus maxima of traveling wave modulus is flowed on the contrary, then judging that disturbance is happened at the non-transformer end of the relay.

5. single-phase earthing traveling-wave protection method according to claim 4, which is characterized in that

The three-phase voltage traveling wave modulus includes three-phase voltage traveling wave Aerial mode component and/or three-phase voltage traveling wave zero _exit；

The three-phase current traveling wave modulus includes three-phase current traveling wave Aerial mode component and/or three-phase current traveling wave zero _exit.

6. single-phase earthing traveling-wave protection method according to any one of claim 1 to 5, which is characterized in that the judgement The step of whether the non-transformer end of the relay occurs singlephase earth fault, including：

The three-phase main-frequency voltage and three-phase main-frequency electric current at the circuit both ends are acquired in real time；

Storing initial three-phase main-frequency voltage and initial three-phase main-frequency electric current respectively, and to the initial three-phase main-frequency voltage and described Initial three-phase main-frequency electric current carries out Phase-Sequence Transformation respectively, obtain power frequency residual voltage virtual value and three-phase main-frequency electric current it is effective Value；

Compare the power frequency residual voltage virtual value and voltage setting valve, if the power frequency residual voltage virtual value is more than or equal to institute Voltage setting valve is stated, then judges that earth fault occurs for the non-transformer end of the relay；

When the non-transformer end generation earth fault for judging the relay, the virtual value and electric current of the three-phase main-frequency electric current Setting valve judges if the virtual value of each phase power current is below the current setting in the three-phase main-frequency electric current Singlephase earth fault occurs for the non-transformer end of the relay.

7. control method according to claim 6, which is characterized in that the method further includes：

The voltage setting valve be equal to the residual voltage under the system normal operation upper critical value and the first predetermined coefficient it Product；

The current setting be equal to the load current under the system normal operation upper critical value and the second predetermined coefficient it Product.

8. a kind of single-phase earthing traveling-wave protection device, which is characterized in that including：

Disturb unit, for when circuit occur traveling wave disturbance, judge disturbance whether be happened at the circuit switching electric appliance without electricity Source；

Trouble unit, the non-transformer end for being happened at the relay when judgement disturbance, judges the non-transformer of the relay Whether end occurs singlephase earth fault；

Protection location sends out tripping for singlephase earth fault to occur when judgement based on the time adjusted according to stepped principle Signal；

The protection location, if be additionally operable to the relay sends out trip signal according to the trip signal, the circuit is without electricity The relay of source will send out trip signal according to the situation of change of the three-phase main-frequency electrical quantity detected.

9. single-phase earthing traveling-wave protection method according to claim 8, which is characterized in that described whole according to stepped principle The fixed time, specially：

10. single-phase earthing traveling-wave protection device according to claim 8, which is characterized in that the disturbance unit, it is specific to use In：

11. single-phase earthing traveling-wave protection method according to claim 8, which is characterized in that the disturbance unit, it is specific to go back For：

12. single-phase earthing traveling-wave protection method according to claim 11, which is characterized in that

13. the single-phase earthing traveling-wave protection device according to any one of claim 8 to 12, which is characterized in that the event Hinder unit, is specifically used for：

When earth fault, the virtual value and current setting of the three-phase main-frequency electric current, if institute occur for the judgement system The virtual value for stating each phase power current in three-phase main-frequency electric current is below the current setting, then judges the relay Singlephase earth fault occurs for non-transformer end.

14. control device according to claim 13, which is characterized in that

15. a kind of computer equipment, including memory, processor and it is stored on the memory and can be on the processor The computer program of operation, which is characterized in that the processor is for executing such as any one of claim 1 to 7 the method The step of.

16. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program It is realized when being executed by processor such as the step of any one of claim 1 to 7 the method.