CN110299698A - A kind of route distance protection method and system - Google Patents
A kind of route distance protection method and system Download PDFInfo
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- CN110299698A CN110299698A CN201810247718.9A CN201810247718A CN110299698A CN 110299698 A CN110299698 A CN 110299698A CN 201810247718 A CN201810247718 A CN 201810247718A CN 110299698 A CN110299698 A CN 110299698A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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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
- H02H7/265—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 making use of travelling wave theory
Abstract
The present invention provides a kind of route distance protection method and systems, comprising: positioned at the first current sensor of the first side of route, the first traveling wave distance measuring unit, the first current protection unit and the first breaker；Positioned at second current sensor of route second side, the second travelling wave ranging unit, the second current protection unit and the second breaker；The present invention is able to solve the problem of existing route distance protection is not suitable with long distance line, is suitble to direct current and AC transmission system.
Description
Technical field
The present invention relates to technical field of electric power, and in particular to a kind of route distance protection method and system.
Background technique
Power circuit is the chief component of power grid and the transmission channel of electric energy.Due to the propagation speed of electromagnetic energy
Degree is exceedingly fast, so quickly equipment protection is to maintain the basis of power system stability operation.Power circuit distance protection is to be based on
What the principle of distance (impedance) relay formed, i.e. line fault distance and impedance is directly proportional.The core element of distance protection hinders
Reactance relay acquires the electric current and voltage of route head end, calculates the ratio of voltage and current.When power circuit breaks down, short circuit
When electric discharge, the ratio of head end voltage and electric current is approximately equal to the impedance of route head end to fault point, as the impedance value is complete lower than route
Long impedance then judges that fault point in line-internal, starts circuit breaker trip, to disconnect faulty line.Due to fault point
Transition resistance has certain influence, therefore the 80~85% of I sections of general protection circuit overall lengths of distance protection to impedance, instantaneous dynamic
Make, II III section understand deferred actions, with the superior and the subordinate's route or other equipment protection cooperation.Distance protection can be distinguished outside line areas
Failure interference, operating principle is simple, speed is fast, is used widely in line protection.
Certainly, route distance protection is realized based on Circuit theory, there is certain line length limitation.For over long distances
Transmission line of electricity, such as super-pressure and extra high voltage line, line capacitance electric current influences existing close to the order of magnitude of operating current, when will be serious
There is the impedance relay of distance protection normally to judge.Meanwhile super-pressure and extra-high voltage grid transmission energy are huge, it is desirable that protection is dynamic
It is shorter to make the time.It is generally believed that the system for being only less than wavelength 1/20 lower than physical size can just be reduced to circuit counting, otherwise
Preferably use electromagnetic transmission lineation opinion.
In order to solve problem above, some scholars propose using traveling-wave protection and are succeeded operating experience, i.e. gathering line
The discharge pulse travelling wave signal of road failure judges position of failure point or section, carries out quickly tripping isolation.But the traveling-wave protection
Flaw existing for theory is possible to judge many lightning stroke flashovers by accident, and there is very big malfunction may.
In conclusion long distance transmission line distance protection technology still has the problem on theory and technology at present.
Summary of the invention
For the defects in the prior art, the present invention provides a kind of route distance protection method and system, to solve
The problem of existing route distance protection is not suitable with long distance line.
To achieve the above object, the present invention the following technical schemes are provided:
In a first aspect, the present invention provides a kind of route distance protections to realize system, comprising: positioned at the of the first side of route
One current sensor, the first traveling wave distance measuring unit, the first current protection unit and the first breaker；Positioned at the of route second side
Two current sensors, the second travelling wave ranging unit, the second current protection unit and the second breaker；
First current sensor is used to acquire the primary current of first side of route in real time and is converted to the first electricity
Flow signal；Second current sensor is used to acquire the primary current of described route second side in real time and is converted to the second electric current
Signal；
The high-frequency signal that the first traveling wave distance measuring unit is used to acquire in line discharge travelling wave signal carries out ranging to sentence
Whether disconnected electric discharge occurs between first side of route and described route second side, if so, starting first electric current is protected
Unit is protected, so that first current protection unit detects the fundamental wave or DC current that first current sensor currently acquires
Whether it is more than pre-set value, if so, judging to break down between first side of route and described route second side, and controls
First circuit breaker trip is to cut off failure；
The high-frequency signal that the second travelling wave ranging unit is used to acquire in line discharge travelling wave signal carries out ranging to sentence
Whether disconnected electric discharge occurs between first side of route and described route second side, if so, starting second electric current is protected
Unit is protected, so that second current protection unit detects the fundamental wave or DC current that second current sensor currently acquires
Whether it is more than pre-set value, if so, judging to break down between first side of route and described route second side, and controls
Second circuit breaker trip is to cut off failure.
Further, the high-frequency signal that the first traveling wave distance measuring unit is used to acquire in line discharge travelling wave signal carries out
Ranging is to judge whether electric discharge occurs between first side of route and described route second side, comprising:
The first traveling wave distance measuring unit is used to acquire the high-frequency signal in line discharge travelling wave signal, and measures point of discharge
To the distance L of the first traveling wave distance measuring unit installation point1If L1≤ L, then judge electric discharge occur in first side of route and
Between described route second side, wherein L is the distance between first side of route and described route second side.
Further, the first traveling wave distance measuring unit and the second travelling wave ranging unit are the row of both-end distance measuring form
Wave distance measuring unit, and when the first traveling wave distance measuring unit and the second travelling wave ranging unit are detected simultaneously by point of discharge to described the
The distance L of one traveling wave distance measuring unit installation point1The distance L of≤L and point of discharge to the second travelling wave ranging unit installation point2
When≤L, just judgement electric discharge occurs between first side of route and described route second side.
Further, first current protection unit has directional element, for making current protection direction be directed toward this side
Route avoids malfunctioning.
Further, the high-frequency signal that the second travelling wave ranging unit is used to acquire in line discharge travelling wave signal carries out
Ranging is to judge whether electric discharge occurs between first side of route and described route second side, comprising:
The second travelling wave ranging unit is used to acquire the high-frequency signal in line discharge travelling wave signal, and measures point of discharge
To the distance L of the second travelling wave ranging unit installation point2If L2≤ L, then judge electric discharge occur in first side of route and
Between described route second side, wherein L is the distance between first side of route and described route second side.
Further, the first traveling wave distance measuring unit and the second travelling wave ranging unit are the row of both-end distance measuring form
Wave distance measuring unit, and when the first traveling wave distance measuring unit and the second travelling wave ranging unit are detected simultaneously by point of discharge to described the
The distance L of one traveling wave distance measuring unit installation point1The distance L of≤L and point of discharge to the second travelling wave ranging unit installation point2
When≤L, just judgement electric discharge occurs between first side of route and described route second side.
Further, second current protection unit has directional element, for making current protection direction be directed toward this side
Route avoids malfunctioning.
Further, the system is suitable for DC transmission system and AC transmission system.
Further, the overhead transmission line length between first side of route and described route second side is greater than 250km；Institute
The cable run length stated between the first side of route and described route second side is greater than 100km.
Second aspect, the present invention also provides a kind of route distance protections based on as described in first aspect above to realize system
The route distance protection implementation method of system, this method comprises:
First current sensor acquires the primary current of first side of route in real time and is converted to the first electric current letter
Number；Second current sensor acquires the primary current of described route second side in real time and is converted to the second current signal；
High-frequency signal in the first traveling wave distance measuring unit acquisition line discharge travelling wave signal carries out ranging to judge to put
Whether electricity occurs between first side of route and described route second side, if so, starting the first current protection list
Member, so that whether first current protection unit detects the fundamental wave that first current sensor currently acquires or DC current
More than pre-set value, if so, judging to break down between first side of route and described route second side, and described in control
First circuit breaker trip is to cut off failure；
High-frequency signal in the second travelling wave ranging unit acquisition line discharge travelling wave signal carries out ranging to judge to put
Whether electricity occurs between first side of route and described route second side, if so, starting the second current protection list
Member, so that whether second current protection unit detects the fundamental wave that second current sensor currently acquires or DC current
More than pre-set value, if so, judging to break down between first side of route and described route second side, and described in control
Second circuit breaker trip is to cut off failure.
As shown from the above technical solution, system is realized in route distance protection provided by the invention, is surveyed using electromagnetic wave traveling wave
The measurement of arcing distance is realized away from traditional impedance relay is substituted, and acquires fundamental wave (direct current) current signal of route the same side
Tripping, avoid instantaneous discharge signal malfunction may, and may be implemented while (direct current) afterflow of fault inspecting fundamental wave and route
The double requirements of troubles inside the sample space meet the definition and quick-action requirement of distance protection, simultaneously because being no longer based on Circuit theory therefore disappearing
In addition to the influence of capacitance current, and do not influenced by fault point transition resistance largely.Therefore, route provided by the invention
System is realized in distance protection, is had the advantage that and is avoided the malfunction of instantaneous discharge signal possible, and may be implemented to detect event simultaneously
The double requirements of barrier point fundamental wave (direct current) afterflow and route troubles inside the sample space, meet the definition and quick-action requirement of distance protection；Not by
Line distribution capacitance electric current influences；Substantially it is not influenced by fault point transition resistance；It is adapted to long distance transmission line, is especially suitable for
Super-pressure or extra-high voltage system；It can be applied to AC or DC system.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the route distance protection troubles inside the sample space schematic diagram that one embodiment of the invention provides；
Fig. 2 is the route distance protection external area error schematic diagram that one embodiment of the invention provides.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Following disclosure provides many different embodiments or example is used to realize different structure of the invention.For letter
Change disclosure of the invention, hereinafter the component of specific examples and setting are described.Certainly, they are merely examples, and
It is not intended to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or letter.It is this heavy
It is for purposes of simplicity and clarity, itself not indicate the relationship between discussed various embodiments and/or setting again.Separately
Outside, structure of the fisrt feature described below in the "upper" of second feature may include that the first and second features are formed as directly connecing
The embodiment of touching, also may include the embodiment that other feature is formed between the first and second features, and such first and
Two features may not be direct contact.In the description of the present invention, it should be noted that unless otherwise specified and limited, term
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be mechanical connection or electrical connection, are also possible to two elements
Internal connection, can be directly connected, can also indirectly connected through an intermediary, for those of ordinary skill in the art
For, the concrete meaning of above-mentioned term can be understood as the case may be.
For the defects in the prior art, the present invention provides the route distance guarantor of a kind of combination travelling wave ranging and current protection
Method and system is protected, to solve the problems, such as that existing distance protection is not suitable with long distance line.
The Circuit theory that existing distance protection uses, therefore it is only adapted to the case where route is much smaller than electromagnetic wavelength, generally want
Circuit size is asked to should be less than the 1/20 of electromagnetic wavelength.For 60/50Hz AC system fundamental wave (direct current) wavelength about 5000/
6000km, hundreds of thousands of km long distance transmission line length and fundamental wave (direct current) wavelength are comparable, and electromagnetic wave passes in the line
Obvious delay is presented in contribute, is exactly the increase of capacitance current with circuit theoretical explanation, even DC line may also be because of
Transimission power changes and causes two sides current fluctuation.Therefore, the impedance relay of distance relationship proportional to impedance exists obvious
It is inadaptable, it is necessary to using and actual conditions it is adaptable electromagnetic transmission it is theoretical, i.e. traveling wave fault location technology, and in technology
It is realized in scheme.
Specifically, one embodiment of the invention provides a kind of route distance protection realization system, comprising: is located at route first
First current sensor of side, the first traveling wave distance measuring unit, the first current protection unit and the first breaker；Positioned at route second
Second current sensor of side, the second travelling wave ranging unit, the second current protection unit and the second breaker；
First current sensor is used to acquire the primary current of first side of route in real time and is converted to the first electricity
Flow signal；Second current sensor is used to acquire the primary current of described route second side in real time and is converted to the second electric current
Signal；
The high-frequency signal that the first traveling wave distance measuring unit is used to acquire in line discharge travelling wave signal carries out ranging to sentence
Whether disconnected electric discharge occurs between first side of route and described route second side, if so, starting first electric current is protected
Unit is protected, so that first current protection unit detects the fundamental wave or DC current that first current sensor currently acquires
Whether it is more than pre-set value, if so, judging to break down between first side of route and described route second side, and controls
First circuit breaker trip is to cut off failure；
The high-frequency signal that the second travelling wave ranging unit is used to acquire in line discharge travelling wave signal carries out ranging to sentence
Whether disconnected electric discharge occurs between first side of route and described route second side, if so, starting second electric current is protected
Unit is protected, so that second current protection unit detects the fundamental wave or DC current that second current sensor currently acquires
Whether it is more than pre-set value, if so, judging to break down between first side of route and described route second side, and controls
Second circuit breaker trip is to cut off failure.
It should be noted that system is realized in route distance protection provided in this embodiment, be suitable for DC transmission system and
AC transmission system.
As shown from the above technical solution, system is realized in route distance protection provided in this embodiment, using electromagnetic wave traveling wave
Ranging substitutes traditional impedance relay and realizes the measurement of arcing distance, and acquires fundamental wave (direct current) the electric current letter of route the same side
Number tripping, avoid instantaneous discharge signal malfunction may, and may be implemented while (direct current) afterflow of fault inspecting fundamental wave and line
The double requirements of road troubles inside the sample space, meet the definition and quick-action requirement of distance protection, simultaneously because it is no longer based on Circuit theory, therefore
The influence of capacitance current is eliminated, and is not influenced by fault point transition resistance (because travelling wave ranging unit is adopted largely
Collection is the high-frequency signal of discharge pulse, therefore is influenced by fault point transition resistance weaker).Therefore, provided in this embodiment
System is realized in route distance protection, is had the advantage that and is avoided the malfunction of instantaneous discharge signal possible, and may be implemented to examine simultaneously
The double requirements for surveying fault point fundamental wave (direct current) afterflow and route troubles inside the sample space, meet the definition and quick-action requirement of distance protection；
It is not influenced by line distribution capacitance electric current；Substantially it is not influenced by fault point transition resistance；It is adapted to long distance transmission line, especially
It is suitble to super-pressure or extra-high voltage system；It can be applied to AC or DC system.
Further, the first traveling wave distance measuring unit is used to acquire the high-frequency signal in line discharge travelling wave signal, and
Distance L of the measurement point of discharge to the first traveling wave distance measuring unit installation point1If L1≤ L then judges that electric discharge occurs in the line
Between the first side of road and described route second side, wherein L between first side of route and described route second side away from
From.
Further, to avoid erroneous judgement, the first traveling wave distance measuring unit and the second travelling wave ranging unit are double
The travelling wave ranging unit of ranging form is held, and when the first traveling wave distance measuring unit and the second travelling wave ranging unit are detected simultaneously by
Distance L of the point of discharge to the first traveling wave distance measuring unit installation point1≤ L and point of discharge are to the second travelling wave ranging unit
The distance L of installation point2When≤L, just judgement electric discharge occurs between first side of route and described route second side.
From both above processing mode it is found that travelling wave ranging unit can use both-end or single end distance measurement as needed.
Further, first current protection unit has directional element, for making current protection direction be directed toward this side
Route avoids malfunctioning.
Further, the high-frequency signal that the second travelling wave ranging unit is used to acquire in line discharge travelling wave signal carries out
Ranging is to judge whether electric discharge occurs between first side of route and described route second side, comprising:
The second travelling wave ranging unit is used to acquire the high-frequency signal in line discharge travelling wave signal, and measures point of discharge
To the distance L of the second travelling wave ranging unit installation point2If L2≤ L, then judge electric discharge occur in first side of route and
Between described route second side, wherein L is the distance between first side of route and described route second side.
Further, to avoid erroneous judgement, the first traveling wave distance measuring unit and the second travelling wave ranging unit are double
The travelling wave ranging unit of ranging form is held, and when the first traveling wave distance measuring unit and the second travelling wave ranging unit are detected simultaneously by
Distance L of the point of discharge to the first traveling wave distance measuring unit installation point1≤ L and point of discharge are to the second travelling wave ranging unit
The distance L of installation point2When≤L, just judgement electric discharge occurs between first side of route and described route second side.
Further, second current protection unit has directional element, for making current protection direction be directed toward this side
Route avoids malfunctioning.
Further, route distance protection provided in this embodiment realizes that system is suitable for long distance line.Due to exchange
Power system frequency is generally 50/60Hz, and corresponding wavelength is about 6000/5000km, therefore, in the present embodiment, corresponding institute
Stating the distance between the first side of route and described route second side should be more than 300km (for 50Hz AC system) or 250km (right
In 60Hz AC system).Such as in a particular embodiment, the distance between first side of route and described route second side are
1200km.Equally, in DC power transmission line, current change quantity has same property (namely straight from the first side to second side
Streaming system equally has the fluctuation of Current Voltage, and only frequency is lower, but is also the process of a wave), therefore, DC line
Distance or length requirement it is consistent with AC system or get the small value.In addition, from the perspective of electromagnetic field and electromagnetic wave, electricity
Energy transmission can be regardless of AC and DC, therefore, from another level it also will be understood that the distance or length requirement of DC line
It is consistent with AC system or get the small value.
In the present embodiment, the overhead transmission line length between first side of route and described route second side is greater than 250km
(for 60Hz AC system) or 300km (for 50Hz AC system), cable run length are greater than 100km and (60Hz are handed over
Streaming system) or 120km (for 50Hz AC system).It is understood that since overhead line is different (electric with the velocity of wave of cable
Cable velocity of wave is low), therefore for the AC system of same frequency, overhead line and the corresponding minimum range of cable are slightly different.
Illustrate the specific embodiment of the present embodiment below with reference to FIG. 1 to FIG. 2.It should be noted that in FIG. 1 to FIG. 2,
The first side of route recited above indicates that route second side recited above is indicated with 2 ends with 1 end, the first electricity recited above
Flow sensor indicates that the first traveling wave distance measuring unit recited above is indicated using travelling wave ranging unit 1 using current sensor 1,
First current protection unit recited above indicates that the first breaker recited above is using open circuit using current protection unit 1
Device 1 indicates that the second current sensor recited above is indicated using current sensor 2, the second travelling wave ranging list recited above
Member indicates that the second current protection unit recited above is indicated using current protection unit 2 using travelling wave ranging unit 2, above
Second breaker is indicated using breaker 2.
Wherein, troubles inside the sample space is as shown in Figure 1, the current sensor of two sides acquires this side electric current (I respectively1Or I2), two sides
Travelling wave ranging unit acquires electric current high-frequency signal (I respectively1HOr I2H), and measure point of discharge to installation point distance.The electricity of two sides
It is more than pre-set value that stream protection location, which acquires this side group wave (direct current) current signal respectively and judges whether,.Occur among route
Fault discharge and when generating fundamental wave (direct current) afterflow, travelling wave ranging unit detection point of discharge in route two sides is located at route centre (L1
< L, and L2< L), starting current protection location detects fundamental wave (direct current) electric current, if being more than pre-set value, protection act starting
Circuit breaker trip disconnects faulty line.If fundamental wave (direct current) afterflow does not occur for lightning discharge, then only travelling wave ranging unit starting,
Lightning current pulse frequency is too high, and current protection unit is failure to actuate, and route does not trip and escapes pulsed discharge.
It is understood that line parameter circuit value is comprehensive since travelling wave ranging technology is namely based on electromagnetic transmission lineation opinion
Consider the influence of distribution capacity and inductance；Simultaneously as the first traveling wave distance measuring unit and the acquisition electric discharge of the second travelling wave ranging unit
The high-frequency signal of pulse, therefore the influence of fault point transition resistance is weaker.
As shown in Fig. 2, when fault point is outside 2 sides outside line areas, 1 end travelling wave ranging unit judges point of discharge distance is more than
Total track length (L1> L), it will not starting current protection act.2 ends are due to apart from the relatively close (L of point of discharge2< L), 2 end travelling wave rangings
The possible erroneous judgement of unit is line-internal failure, and starting current protection issues this side breaker of trip signal false tripping；For this
Situation can choose the travelling wave ranging unit of both-end distance measuring form, need to increase time signal and communication channel；Alternatively, electric current
Protection location increases directional element, so that current protection direction is directed toward this side line road, avoids malfunctioning.
Similarly, when failure is outside 1 end, using identical method.
From the description above it is found that in the present embodiment, current protection unit detects fundamental wave (direct current) electric current, travelling wave ranging list
Member acquisition high-frequency pulse signal, calculates point of discharge distance using propagation velocity of electromagnetic wave, while avoiding capacitance current and transition
The influence of resistance, this method theoretically solve the problems, such as that long range power circuit realizes distance protection, are more in line with electricity
The mechanism of magnetic wave energy transmission, it may be convenient to realize.
Present invention incorporates current protection and travelling wave ranging advantage, overcome route distance protection by line capacitance electric current,
The disadvantage that line impedance caused by fault resstance influences changes and current protection movement speed is slow is especially suitable for long distance powedr transmission
Route.
Another embodiment of the present invention provides a kind of route distance protections based on as described in above example to realize system
Route distance protection implementation method, this method specifically includes:
First current sensor acquires the primary current of first side of route in real time and is converted to the first electric current letter
Number；Second current sensor acquires the primary current of described route second side in real time and is converted to the second current signal；
High-frequency signal in the first traveling wave distance measuring unit acquisition line discharge travelling wave signal carries out ranging to judge to put
Whether electricity occurs between first side of route and described route second side, if so, starting the first current protection list
Member, so that whether first current protection unit detects the fundamental wave that first current sensor currently acquires or DC current
More than pre-set value, if so, judging to break down between first side of route and described route second side, and described in control
First circuit breaker trip is to cut off failure；
High-frequency signal in the second travelling wave ranging unit acquisition line discharge travelling wave signal carries out ranging to judge to put
Whether electricity occurs between first side of route and described route second side, if so, starting the second current protection list
Member, so that whether second current protection unit detects the fundamental wave that second current sensor currently acquires or DC current
More than pre-set value, if so, judging to break down between first side of route and described route second side, and described in control
Second circuit breaker trip is to cut off failure.
Since route distance protection implementation method provided in this embodiment based on the above embodiment protect by the route distance
It protects realization system to realize, therefore its working principle is similar with beneficial effect, for details, reference can be made to the descriptions of above-described embodiment, herein not
It repeats again.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is by appended claims and its equivalent limits.
Claims (10)
1. system is realized in a kind of route distance protection characterized by comprising the first current sense positioned at the first side of route
Device, the first traveling wave distance measuring unit, the first current protection unit and the first breaker；Positioned at second current sense of route second side
Device, the second travelling wave ranging unit, the second current protection unit and the second breaker；
First current sensor is used to acquire the primary current of first side of route in real time and is converted to the first electric current letter
Number；Second current sensor is used to acquire the primary current of described route second side in real time and is converted to the second electric current letter
Number；
The high-frequency signal that the first traveling wave distance measuring unit is used to acquire in line discharge travelling wave signal carries out ranging to judge to put
Whether electricity occurs between first side of route and described route second side, if so, starting the first current protection list
Member, so that whether first current protection unit detects the fundamental wave that first current sensor currently acquires or DC current
More than pre-set value, if so, judging to break down between first side of route and described route second side, and described in control
First circuit breaker trip is to cut off failure；
The high-frequency signal that the second travelling wave ranging unit is used to acquire in line discharge travelling wave signal carries out ranging to judge to put
Whether electricity occurs between first side of route and described route second side, if so, starting the second current protection list
Member, so that whether second current protection unit detects the fundamental wave that second current sensor currently acquires or DC current
More than pre-set value, if so, judging to break down between first side of route and described route second side, and described in control
Second circuit breaker trip is to cut off failure.
2. system according to claim 1, which is characterized in that the first traveling wave distance measuring unit is for acquiring line discharge
High-frequency signal in travelling wave signal carries out ranging to judge whether electric discharge occurs in first side of route and the route second
Between side, comprising:
The first traveling wave distance measuring unit is used to acquire the high-frequency signal in line discharge travelling wave signal, and measures point of discharge to institute
State the distance L of the first traveling wave distance measuring unit installation point1If L1≤ L then judges that electric discharge occurs in first side of route and described
Between route second side, wherein L is the distance between first side of route and described route second side.
3. system according to claim 2, which is characterized in that the first traveling wave distance measuring unit and second traveling wave are surveyed
It is the travelling wave ranging unit of both-end distance measuring form away from unit, and when the first traveling wave distance measuring unit and the second travelling wave ranging unit
Be detected simultaneously by point of discharge to the first traveling wave distance measuring unit installation point distance L1≤ L and point of discharge are to second row
The distance L of wave distance measuring unit installation point2When≤L, just judgement electric discharge occurs in first side of route and described route second side
Between.
4. system according to claim 2, which is characterized in that first current protection unit has directional element, uses
In making current protection direction be directed toward this side line road, avoid malfunctioning.
5. system according to claim 1, which is characterized in that the second travelling wave ranging unit is for acquiring line discharge
High-frequency signal in travelling wave signal carries out ranging to judge whether electric discharge occurs in first side of route and the route second
Between side, comprising:
The second travelling wave ranging unit is used to acquire the high-frequency signal in line discharge travelling wave signal, and measures point of discharge to institute
State the distance L of the second travelling wave ranging unit installation point2If L2≤ L then judges that electric discharge occurs in first side of route and described
Between route second side, wherein L is the distance between first side of route and described route second side.
6. system according to claim 5, which is characterized in that the first traveling wave distance measuring unit and second traveling wave are surveyed
It is the travelling wave ranging unit of both-end distance measuring form away from unit, and when the first traveling wave distance measuring unit and the second travelling wave ranging unit
Be detected simultaneously by point of discharge to the first traveling wave distance measuring unit installation point distance L1≤ L and point of discharge are to second row
The distance L of wave distance measuring unit installation point2When≤L, just judgement electric discharge occurs in first side of route and described route second side
Between.
7. system according to claim 5, which is characterized in that second current protection unit has directional element, uses
In making current protection direction be directed toward this side line road, avoid malfunctioning.
8. system according to claim 1, which is characterized in that the system is suitable for DC transmission system and ac transmission
System.
9. described in any item systems according to claim 1~8, which is characterized in that first side of route and the route the
Overhead transmission line length between two sides is greater than 250km；Cable run between first side of route and described route second side
Length is greater than 100km.
10. a kind of realize that the route distance protection of system is real based on route distance protection as described in any one of claims 1 to 9
Existing method characterized by comprising
First current sensor acquires the primary current of first side of route in real time and is converted to the first current signal；Institute
The second current sensor is stated to acquire the primary current of described route second side in real time and be converted to the second current signal；
High-frequency signal in the first traveling wave distance measuring unit acquisition line discharge travelling wave signal carries out ranging to judge to discharge and be
No generation is between first side of route and described route second side, if so, starting first current protection unit, with
Make first current protection unit detect fundamental wave that first current sensor currently acquires or DC current whether be more than
Pre-set value if so, judging to break down between first side of route and described route second side, and controls described first
Circuit breaker trip is to cut off failure；
High-frequency signal in the second travelling wave ranging unit acquisition line discharge travelling wave signal carries out ranging to judge to discharge and be
No generation is between first side of route and described route second side, if so, starting second current protection unit, with
Make second current protection unit detect fundamental wave that second current sensor currently acquires or DC current whether be more than
Pre-set value if so, judging to break down between first side of route and described route second side, and controls described second
Circuit breaker trip is to cut off failure.
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| CN201810247718.9A CN110299698A (en) | 2018-03-23 | 2018-03-23 | A kind of route distance protection method and system |
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| CN201810247718.9A CN110299698A (en) | 2018-03-23 | 2018-03-23 | A kind of route distance protection method and system |
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Citations (3)
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|---|---|---|---|---|
| US20140200726A1 (en) * | 2011-08-16 | 2014-07-17 | Abb Technology Ag | Method of distance protection of parallel transmission line |
| CN103969553A (en) * | 2014-05-23 | 2014-08-06 | 中国石油大学(华东) | Cable and overhead line mixed line double-end traveling wave fault location algorithm based on piecewise compensation principle |
| CN104701822A (en) * | 2013-12-06 | 2015-06-10 | 清华大学 | Power circuit protection method |
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2018
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|---|---|---|---|---|
| US20140200726A1 (en) * | 2011-08-16 | 2014-07-17 | Abb Technology Ag | Method of distance protection of parallel transmission line |
| CN104701822A (en) * | 2013-12-06 | 2015-06-10 | 清华大学 | Power circuit protection method |
| CN103969553A (en) * | 2014-05-23 | 2014-08-06 | 中国石油大学(华东) | Cable and overhead line mixed line double-end traveling wave fault location algorithm based on piecewise compensation principle |
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Application publication date: 20191001 |