CN109301800A - Distribution line adaptive guard method and system based on traveling wave - Google Patents
Distribution line adaptive guard method and system based on traveling wave Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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Abstract
The distribution line adaptive guard method and system based on traveling wave that the invention discloses a kind of, belong to route protection technical field.Larger in the failure phase initial current traveling wave of measurement point of the faulty line far from bus, singlephase earth fault, non-faulting is mutually zero；In the measurement point close to bus, the failure phase initial row wave amplitude of singlephase earth fault is twice of non-faulting phase, and polarity is opposite.Larger in the failure phase initial current traveling wave of measurement point of the faulty line far from bus, double earthfault, non-faulting is mutually zero；In the measurement point close to bus, the failure phase and non-faulting phase initial current traveling wave of double earthfault are without obvious characteristic.The distribution line adaptive guard scheme that the application proposes can accurately and reliably act all types of short troubles.Since the propagation of initial traveling wave is not influenced by ground resistance situation, the protection scheme that the application proposes can cope with high resistance earthing fault.
Description
Technical field
The distribution line adaptive guard method and system based on traveling wave that the present invention relates to a kind of, belong to route protection technology
Field.
Background technique
The singlephase earth fault of system with non effectively earth ed neutral is different from other short trouble features.Single-phase earthing not structure
At short-circuit loop, for power current without significant changes, the overcurrent protection suitable for other short troubles cannot protect single-phase earthing.
The single-phase earthing fast failure recognizer based on travelling waves that set forth herein a kind of, mentioned algorithm can accurately identify single-phase earthing
Failure and non-singlephase earth fault.And on this basis, constitute can adaptive all short-circuit-types distribution line protection side
Case.
Singlephase earth fault accounts for 80% or more of distribution line failure sum, is to threaten matching for neutral non-effective grounding
The a great problem neutral non-effective grounding of electric line safe operation is the common earthing mode of distribution line, including neutral point
Earth-free and neutral by arc extinction coil grounding two ways.After phase to phase fault or three-phase fault occurs, traditional overcurrent
Protection can be with precision maneuver.But after singlephase earth fault occurs, since there is no the feature of overcurrent, relay is difficult accurately
It is identified.To solve this problem, the nineties in last century proposes single-phase grounding selecting technology.Single-phase grounding selecting technical monitoring
The current information in more feedback lines on one or more bus, compares and selects ground path and alarm, by operator on duty into
The further processing of row.
However route selection technology effect at the scene and bad.Possible reason includes: that 1 route selection needs to acquire all feeder line letters
Breath, and collected information is required to be based on identical comparison basis.This is higher to primary equipment specification and standard requirements.2 route selections
Technology only copes with singlephase earth fault, is not suitable for phase to phase fault and three-phase fault；The processing of 3 singlephase earth faults not in time, can
System can be caused overvoltage occur.In recent years, since single-phase earthing causes overvoltage to have hair when causing the accident of personal injury
It is raw.The protection technique of tripping is accurately quickly identified and can be carried out therefore, it is necessary to study singlephase earth fault
In order to meet the requirement of single phase earthing protection, document proposes a kind of to be connect based on the single-phase of fault traveling wave feature
Earth fault guard method.The algorithm is realized pair using protected circuit residual voltage traveling wave and zero-sequence current polarity of traveling wave difference
Singlephase earth fault occurs to be differentiated in area or outside area, can be based on single line information and accurately identify whether list has occurred
Phase ground fault.Further, there is document to propose the one-phase ground protection technology with time delay, meet singlephase earth fault every
Requirement from selectivity.To avoid false protection caused by non-singlephase earth fault traveling wave, is proposed there are also document and utilize power frequency
Feature distinguishes singlephase earth fault and non-singlephase earth fault.However, the research of document is not related to only for singlephase earth fault
And other failures of distribution line, therefore in practical applications, proposing protection need to match with traditional overcurrent protection.
Summary of the invention
In view of this, the distribution line adaptive guard method that the object of the present invention is to provide a kind of based on traveling wave and being
System, is integrated with singlephase earth fault traveling-wave protection and overcurrent protection, and emphasis solves the fault type recognition based on traveling wave
Problem realizes the adaptive guard of the non-all types failure for having effective grounding distribution line of neutral point.
The purpose of the present invention is what is be achieved through the following technical solutions:
Distribution line adaptive guard method based on traveling wave, this method specifically:
(1) it sets A phase and singlephase earth fault occurs；After failure occurs, equivalent traveling wave power supply acts on failure phase, generates failure
Initial traveling wave at point, and road direction two sides are propagated along the line；For the measurement point on route, the initial current of one phase of failure is experienced
Traveling wave, the two-phase of non-faulting are not felt by initial current traveling wave；
When the measurement point of protective device is mounted on position of the route close to bus, since wave impedance is discontinuous at bus,
When reaching at bus catadioptric will occur for the initial traveling wave in fault point；Reflected traveling wave is generated on faulty line, on non-fault line
Generate refraction traveling wave；
The initial traveling wave of bus measurement point faulty line is being superimposed for fault point incidence wave and bus back wave；By dividing
The coefficient of catadioptric and the polarity and amplitude of catadioptric ejected wave are analysed, the initial current traveling wave of each phase of faulty line is obtained；
Measurement point is far from bus, and when circuit types is failure phase, initial current traveling wave amplitude maximum is denoted as Imax1,
Initial current traveling wave direction is negative；
Measurement point is far from bus, and when circuit types is non-faulting phase, initial current traveling wave amplitude is 0, initial current
Traveling wave direction is not present；
When at bus, when circuit types is failure phase, initial current traveling wave amplitude is measurement pointJust
Beginning current traveling wave direction is negative；
Measurement point is at bus, and when circuit types is non-faulting phase, initial current traveling wave amplitude is
Initial current traveling wave direction is positive and negative；
That is: in measurement point of the faulty line far from bus, the failure phase initial current traveling wave of singlephase earth fault is very big, non-
Failure mutually almost without；In the measurement point close to bus, the failure phase initial current traveling wave of singlephase earth fault is non-faulting
Twice of phase, polarity is opposite；
(2) it sets AB two-phase and ground fault occurs, in the case where ignoring ground resistance, A phase, which is grounded, to be grounded with B phase same
Moment occurs；According to the superposition law of linear system, it is believed that AB two phase ground is that A phase is grounded the linear superposition being grounded by B phase；
Measurement point is far from bus, and when circuit types is failure phase, initial current traveling wave amplitude is not zero, initial electricity
Popular wave direction is indefinite；
Measurement point is far from bus, and when circuit types is non-faulting phase, initial current traveling wave amplitude is 0, initial current
Traveling wave direction is not present；
Measurement point is when at the bus, when circuit types is failure phase and non-faulting phase, initial current traveling wave amplitude and
Initial current traveling wave direction is without obvious characteristic；
That is: in measurement point of the faulty line far from bus, the failure phase initial current traveling wave of double earthfault is larger, non-
Failure is mutually zero；In the measurement point close to bus, the failure phase and non-faulting phase initial current traveling wave of double earthfault without
Obvious characteristic.
The distribution line adaptive guard system based on traveling wave based on the method, including starting element, recognition component
And protection element；
The starting element is responsible for detecting the abnormal signal that distribution network generates, and carries out preliminary judgement；Starting element
It is divided into traveling wave starting module and Sudden Changing Rate starting module；
The traveling wave starting module belongs to hardware-initiated, needs to be equipped with special hardware circuit, is adopted using 1MHz ultrahigh speed
Sample frequency；It is quick into single-phase earthing when detecting that any zero mode voltage traveling wave or current traveling wave amplitude are more than setting valve
Identification module；
The Sudden Changing Rate of the Sudden Changing Rate starting module cycle calculations three-phase current；When current calculated value is more than setting valve,
Sudden Changing Rate starting, is directly entered overcurrent protection module；
The recognition component are as follows: according to the difference of nearly bus and the initial travelling waves of remote bus protection point, single-phase earthing is fast
Fast recognition component can judge earth fault type；It is determined as singlephase earth fault, into single-phase earthing traveling-wave protection
Module；Otherwise it is determined as double earthfault, into overcurrent protection module；
The protection element is divided into single-phase earthing traveling-wave protection module and overcurrent protection module；
Single-phase earthing traveling-wave protection module: zero mode voltage traveling wave maximum and zero mould current traveling wave coefficient maximum polarities are opposite
When, it is determined as single-phase earthing.When power-frequency voltage be more than certain amplitude, be just determined as failure, otherwise it is assumed that be thunder and lightning traveling wave etc. its
He interferes traveling wave；Relay protective scheme is as follows
UM0It is zero mode voltage traveling wave modulus maximum；
IM0It is zero mould current traveling wave modulus maximum；
It is power frequency residual voltage amplitude；
U0setIt is the setting valve of power frequency residual voltage amplitude；
Overcurrent protection module: overcurrent protection refers to when any phase current is more than setting valve, while being delayed certain time
The current value still maintains afterwards, protection act；Relay protective scheme is as follows:
It is power frequency phase current magnitude；
IsetIt is the setting valve of power frequency phase current magnitude；
Δ t is delay time；
ΔtsetIt is the setting valve of delay time；
The protection element all controls tripping, after having there is an element to issue trip signal, another locking.
The beneficial effects of the present invention are:
Two-phase phase fault and three phase short circuit fault will not be triggered since system will not generate zero sequence traveling wave
Traveling wave starting.But above-mentioned two classes failure can generate overcurrent, Sudden Changing Rate starting can be triggered, into over-current protecting element, mistake
Current protection movement, cuts off failure.Single-phase earthing traveling-wave protection locking.
After singlephase earth fault occurs, system can generate residual voltage/current traveling wave, the starting of traveling wave starting element.Starting
Enter the quick identification module of single-phase earthing afterwards.Enter one-phase ground protection module after judging according to the criterion of identification module.It is single-phase
It is grounded traveling-wave protection movement, failure removal.Overcurrent protection locking.
After double earthfault occurs, system can generate residual voltage/current traveling wave, and traveling wave is hardware-initiated.Start laggard
Enter single-phase earthing identification module, since double earthfault is unsatisfactory for the criterion that single-phase earthing quickly identifies, thus entrance is excessively electric
Flow protection element.Overcurrent protection movement, cuts off failure.Single-phase earthing traveling-wave protection locking.
In fact, double earthfault can also generate overcurrent, the starting of mutagenesis amount.But the detection of Sudden Changing Rate and sentence
Surely 1~2 cycle is needed, overcurrent protection module can be just passed the signal along to.And the used time of the quick identification module of single-phase earthing
The far smaller than above-mentioned time.Therefore for double earthfault, single-phase earthing recognition component can trigger over current protection faster
Shield movement, shortens guard time.
In conclusion the application propose distribution line adaptive guard scheme can to all types of short troubles into
The accurate and reliable movement of row.Since the propagation of initial traveling wave is not influenced by ground resistance situation, the protection of the application proposition
Scheme can cope with high resistance earthing fault.
Other advantages, target and feature of the invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.Target and other advantages of the invention can be wanted by following specification and right
Book is sought to be achieved and obtained.
Detailed description of the invention
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
The detailed description of one step, in which:
Fig. 1 is logical communication link schematic diagram between each structure of the present invention；
Fig. 2 is the measurement point algorithm schematic diagram being positioned close at bus；
Fig. 3 is the measurement point algorithm schematic diagram being arranged far from bus.
Specific embodiment
Hereinafter reference will be made to the drawings, and a preferred embodiment of the present invention will be described in detail.It should be appreciated that preferred embodiment
Only for illustrating the present invention, rather than limiting the scope of protection of the present invention.
There are two the contents that the application includes, and one is the single-phase earthing Fast Recognition Algorithm based on traveling wave, the other is
Distribution line adaptive guard scheme.The former is the essential important ring of the latter.
1, single-phase earthing Fast Recognition Algorithm
Singlephase earth fault identification, refers to the feature according to failure, to distinguish singlephase earth fault and the event of non-single-phase earthing
Barrier.In ultra-high-tension power transmission line, singlephase earth fault identification is for selecting whether protection carries out single-phase tripping.Have neutral point is non-
In the distribution line for imitating ground connection, accurately judges singlephase earth fault and non-singlephase earth fault, different protections can be taken
Strategy realizes adaptive guard.
Singlephase earth fault identification depends on fault signature.Travelling waves based on distributed parameter transmission line model and based on collection
The power frequency of total parameter circuit model is characterized in that two kinds are typically used fault signature.Wherein, initial travelling waves refer to that failure is sent out
Travelling waves caused by raw moment, are a kind of high frequency transient features.It was verified that the extraction of power frequency feature needed for 1~2 week
Wave, the time that the extraction of initial travelling waves needs is far smaller than power frequency feature, therefore the quick identification of single-phase earthing needs base
In initial travelling waves.
Zero line wave is the most important travelling waves of ground fault.Two-phase phase fault and three-phase fault be not due to complete
Zero mould access, because without zero line wave.But singlephase earth fault and double earthfault are all as characterized above.Therefore
The core that singlephase earth fault quickly identifies is exactly to analyze single-phase earthing and the initial travelling waves of two phase ground, finds it
Difference.Identical in view of zero line wave of the two, phasor traveling wave becomes the emphasis of analysis.
Assuming that singlephase earth fault occurs for A phase.After failure occurs, equivalent traveling wave power supply acts on failure phase, generates failure
Initial traveling wave at point, and road direction two sides are propagated along the line.Therefore for the measurement point on route, failure one can be experienced
The initial current traveling wave of phase, but the two-phase of non-faulting is not felt by initial current traveling wave.
When the measurement point of protective device is mounted on position of the route close to bus, since wave impedance is discontinuous at bus,
When reaching at bus catadioptric will occur for the initial traveling wave in fault point.Reflected traveling wave is generated on faulty line, on non-fault line
Generate refraction traveling wave.It can be seen from the above, the initial traveling wave of bus measurement point faulty line is that fault point incidence wave and bus are anti-
The superposition of ejected wave.By analyzing the coefficient of catadioptric and the polarity and amplitude of catadioptric ejected wave, available each phase of faulty line
Initial current traveling wave.
Integrated Summary is as follows:
To sum up analysis is it may be concluded that in measurement point of the faulty line far from bus, the failure phase of singlephase earth fault
Initial current traveling wave is very big, non-faulting mutually almost without；At the beginning of the measurement point close to bus, the failure phase of singlephase earth fault
Beginning current traveling wave is twice of non-faulting phase, and polarity is opposite.
Assuming that ground fault, which occurs, for AB two-phase can be grounded with A phase and be grounded with B phase in the case where ignoring ground resistance
Synchronization occurs.Since the fault component network that traveling wave is propagated is a linear system.According to the superposition law of linear system,
AB two phase ground may be considered A phase and be grounded the linear superposition being grounded by B phase.Analysis mode same as above is taken, is obtained
The initial travelling waves of measurement point far from bus are as follows:
To sum up analysis is it may be concluded that in measurement point of the faulty line far from bus, the failure phase of double earthfault
Initial current traveling wave is larger, and non-faulting is mutually zero；In the measurement point close to bus, the failure phase of double earthfault and non-event
Hinder phase initial current traveling wave without obvious characteristic.
2, distribution line adaptive guard scheme
In order to meet distribution line for the adaptive guard of all fault types, overall plan includes starting element, knows
Three parts of other element and protection element.Logical communication link between each section is as shown in Figure 1.
Embodiment:
(1) single-phase earthing Fast Recognition Algorithm
The quick identification of singlephase earth fault is needed by the traveling wave of singlephase earth fault and non-singlephase earth fault spy
Sign.
Zero-sequence current traveling wave/residual voltage traveling wave is the exclusive feature of ground fault, therefore can be real by zero sequence traveling wave
Now to the identification of ground fault (single-phase earthing and two phase ground) and ungrounded failure (two-phase phase fault and three-phase fault).
Further, need to use the feature of three-phase current traveling wave to the identification of single-phase earthing and two phase ground.Close to female
The measurement point of the measurement point of line and separate bus, fault traveling wave feature have marked difference.Therefore for being positioned close to bus
Measurement point at place and separate bus, with two sets of algorithms.
At bus, as shown in Figure 2:
UM0It is zero mode voltage traveling wave modulus maximum；
IM0It is zero mould current traveling wave modulus maximum；
ipmaxIt is a maximum phase in phasor current traveling wave；
ip1And ip2It is remaining biphase current traveling wave；
ipsetIt is phasor current traveling wave setting valve；
δ is Small errors.
At separate bus, as shown in Figure 3:
Polar () indicates polarity of traveling wave.
(2) distribution line adaptive guard scheme
2.1 starting element
Starting element is responsible for detecting the abnormal signal that distribution network generates, and carries out preliminary judgement.Starting element is divided into
Traveling wave starting module and Sudden Changing Rate starting module.
Traveling wave starting module belongs to hardware-initiated, needs to be equipped with special hardware circuit, using 1MHz ultra-high speed sampling frequency
Rate.When detecting that any zero mode voltage traveling wave or current traveling wave amplitude are more than setting valve, quickly identified into single-phase earthing
Module.
The Sudden Changing Rate of Sudden Changing Rate starting module cycle calculations three-phase current.When current calculated value is more than setting valve, mutation
Amount starting, is directly entered overcurrent protection module.
2.2 recognition component
The quick identical criterion of single-phase earthing needs the difference in view of nearly bus and the initial travelling waves of remote bus protection point.
It is determined as singlephase earth fault, into single-phase earthing traveling-wave protection module.Otherwise it is determined as double earthfault, into
Enter overcurrent protection module.
2.3 protection element
Protection criteria is divided into single-phase earthing traveling-wave protection module and overcurrent protection module.
The single-phase earthing traveling-wave protection that document is mentioned is at present for system with non effectively earth ed neutral singlephase earth fault
Most effective protection scheme.The basic principle of the program is protection point inspection after singlephase earth fault occurs for protected circuit section
The zero mode voltage traveling wave and zero mould current traveling wave polarity measured is opposite.Simultaneously in order to avoid thunder and lightning traveling wave does protective device
It disturbs, which introduces power frequency residual voltage amplitude as assistant criteria simultaneously.When power-frequency voltage be more than certain amplitude, just sentence
It is set to failure, otherwise it is assumed that being the interference of thunder and lightning traveling wave.Relay protective scheme is as follows
UM0It is zero mode voltage traveling wave modulus maximum；
IM0It is zero mould current traveling wave modulus maximum；
It is power frequency residual voltage amplitude；
U0setIt is the setting valve of power frequency residual voltage amplitude；
Overcurrent protection refer to when any phase current be more than setting valve, while be delayed after a certain period of time the current value still protect
It holds, protection act.Relay protective scheme is as follows:
It is power frequency phase current magnitude；
IsetIt is the setting valve of power frequency phase current magnitude；
Δ t is delay time；
ΔtsetIt is the setting valve of delay time.
Two protection elements can control tripping.After having there is an element to issue trip signal, another locking.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention
Scope of the claims in.
Claims (2)
1. the distribution line adaptive guard method based on traveling wave, it is characterised in that: this method specifically:
(1) it sets A phase and singlephase earth fault occurs；After failure occurs, equivalent traveling wave power supply acts on failure phase, generates fault point
Initial traveling wave, and along the line road direction two sides propagate；For the measurement point on route, the initial current row of one phase of failure is experienced
Wave, the two-phase of non-faulting are not felt by initial current traveling wave；
When the measurement point of protective device is mounted on position of the route close to bus, since wave impedance is discontinuous at bus, failure
When reaching at bus catadioptric will occur for the initial traveling wave of point；Reflected traveling wave is generated on faulty line, is generated on non-fault line
Reflect traveling wave；
The initial traveling wave of bus measurement point faulty line is being superimposed for fault point incidence wave and bus back wave；It is rolled over by analysis
The polarity and amplitude of the coefficient of reflection and catadioptric ejected wave obtain the initial current traveling wave of each phase of faulty line；
Measurement point is far from bus, and when circuit types is failure phase, initial current traveling wave amplitude maximum is denoted as Imax1, initial electricity
Popular wave direction is negative；
Measurement point is far from bus, and when circuit types is non-faulting phase, initial current traveling wave amplitude is 0, initial current traveling wave
Direction is not present；
When at bus, when circuit types is failure phase, initial current traveling wave amplitude is measurement pointInitial electricity
Popular wave direction is negative；
Measurement point is at bus, and when circuit types is non-faulting phase, initial current traveling wave amplitude isInitial electricity
Popular wave direction is positive and negative；
That is: in measurement point of the faulty line far from bus, the failure phase initial current traveling wave of singlephase earth fault is very big, non-faulting
Mutually almost without；In the measurement point close to bus, the failure phase initial current traveling wave of singlephase earth fault is non-faulting phase
Twice, polarity is opposite；
(2) it sets AB two-phase and ground fault occurs, in the case where ignoring ground resistance, A phase, which is grounded, to be grounded with B phase in synchronization
Occur；According to the superposition law of linear system, it is believed that AB two phase ground is that A phase is grounded the linear superposition being grounded by B phase；
Measurement point is far from bus, and when circuit types is failure phase, initial current traveling wave amplitude is not zero, initial current traveling wave
Direction is indefinite；
Measurement point is far from bus, and when circuit types is non-faulting phase, initial current traveling wave amplitude is 0, initial current traveling wave
Direction is not present；
Measurement point is when at the bus, when circuit types is failure phase and non-faulting phase, initial current traveling wave amplitude and initial
Current traveling wave direction is without obvious characteristic；
That is: in measurement point of the faulty line far from bus, the failure phase initial current traveling wave of double earthfault is larger, non-faulting
It is mutually zero；In the measurement point close to bus, the failure phase and non-faulting phase initial current traveling wave of double earthfault are without obvious
Feature.
2. the distribution line adaptive guard system based on traveling wave based on claim 1 the method, it is characterised in that: this is
System includes starting element, recognition component and protection element, is cooperated by three kinds of elements, realizes the protection to distribution line；
The starting element is responsible for detecting the abnormal signal that distribution network generates, and carries out preliminary judgement；Starting element is divided into
Traveling wave starting module and Sudden Changing Rate starting module；
The traveling wave starting module belongs to hardware-initiated, needs to be equipped with special hardware circuit, using 1MHz ultra-high speed sampling frequency
Rate；When detecting that any zero mode voltage traveling wave or current traveling wave amplitude are more than setting valve, quickly identified into single-phase earthing
Module；
The Sudden Changing Rate of the Sudden Changing Rate starting module cycle calculations three-phase current；When current calculated value is more than setting valve, mutation
Amount starting, is directly entered overcurrent protection module；
The recognition component are as follows: according to the difference of nearly bus and the initial travelling waves of remote bus protection point, single-phase earthing is quickly known
Other element can judge earth fault type；It is determined as singlephase earth fault, into single-phase earthing traveling-wave protection module；
Otherwise it is determined as double earthfault, into overcurrent protection module；
The protection element is divided into single-phase earthing traveling-wave protection module and overcurrent protection module；
Single-phase earthing traveling-wave protection module: when zero mode voltage traveling wave maximum and opposite zero mould current traveling wave coefficient maximum polarities, sentence
It is set to single-phase earthing；When power-frequency voltage be more than certain amplitude, be just determined as failure, otherwise it is assumed that being other traveling waves such as thunder and lightning traveling wave
Interference；Relay protective scheme is as follows
UM0It is zero mode voltage traveling wave modulus maximum；
IM0It is zero mould current traveling wave modulus maximum；
It is power frequency residual voltage amplitude；
U0setIt is the setting valve of power frequency residual voltage amplitude；
Overcurrent protection module: overcurrent protection refer to when any phase current be more than setting valve, while be delayed after a certain period of time should
Current value still maintains, protection act；Relay protective scheme is as follows:
It is power frequency phase current magnitude；
IsetIt is the setting valve of power frequency phase current magnitude；
Δ t is delay time；
ΔtsetIt is the setting valve of delay time；
The protection element all controls tripping, after having there is an element to issue trip signal, another locking.
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| US11543462B2 (en) | 2019-11-23 | 2023-01-03 | Tsinghua University | Single-phase-to-ground fault line selection method for distribution lines and computer readable storage medium |
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| CN114034963A (en) * | 2021-09-27 | 2022-02-11 | 国网青海省电力公司玉树供电公司 | Distribution line single-phase earth fault section identification method based on phase current variable quantity |
| CN114660416A (en) * | 2022-04-19 | 2022-06-24 | 云南电网有限责任公司电力科学研究院 | Single-phase earth fault diagnosis method and device of distribution line under photovoltaic access |
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