CN109378797A - A kind of high voltage overhead lines breaking protection recognition methods - Google Patents
A kind of high voltage overhead lines breaking protection recognition methods Download PDFInfo
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- CN109378797A CN109378797A CN201811080926.0A CN201811080926A CN109378797A CN 109378797 A CN109378797 A CN 109378797A CN 201811080926 A CN201811080926 A CN 201811080926A CN 109378797 A CN109378797 A CN 109378797A
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- current
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- disconnection fault
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to mechanical injury, e.g. rupture of line, breakage of earth connection
-
- 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
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of high voltage overhead lines breaking protection recognition methods and device, and described method includes following steps: obtaining the current information of protected circuit；Judge the current information with the presence or absence of high-frequency current signal；High-frequency current signal if it exists, it is determined that the protected circuit works normally；High-frequency current signal if it does not exist then calculates phase current magnitude according to the current information, and judges whether the protected circuit occurs disconnection fault according to the comparing result of the phase current magnitude and current setting.Described device is for realizing the method.The technical issues of the method for the present invention and device are able to solve current high voltage overhead lines disconnection fault are difficult under underloading or no-load condition.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, and in particular to a kind of high voltage overhead lines breaking protection identification
Method.
Background technique
Currently, the scissors crossings such as high-tension overhead line and building, traffic route are more, after disconnection fault occurs, if defeated
Electric line is landed with electriferous state, be easy to cause the safety accidents such as personal injury and electric railway stoppage in transit.Therefore, disconnection fault
After generation, compeling to be essential identifies and cuts off faulty line before faulty line landing, avoids faulty line landing from causing more serious
Harm.In realizing process of the present invention, inventor has found that the prior art at least has following technical problem: due to disconnection fault
Probability of happening is small, fault characteristic is lighter, therefore the research in presently relevant direction is not enough, and mentioned method is not very practical.And
When route underloading or zero load, electrical quantity variation is very small before and after disconnection fault occurs, and current protection scheme is caused all to exist
Certain dead zone.
Summary of the invention
It is an object of that present invention to provide a kind of high voltage overhead lines breaking protection recognition methods, to solve current high voltage overhead lines
The technical issues of disconnection fault is difficult under underloading or no-load condition.
In order to achieve the object of the present invention, first aspect present invention provides a kind of high voltage overhead lines breaking protection recognition methods,
Include the following steps:
Obtain the current information of protected circuit；
Judge the current information with the presence or absence of high-frequency current signal；
High-frequency current signal if it exists, it is determined that the protected circuit works normally；
High-frequency current signal if it does not exist then calculates phase current magnitude according to the current information, and according to the phase electricity
The comparing result of stream amplitude and current setting judges whether the protected circuit occurs disconnection fault.
Wherein, the comparing result according to the phase current magnitude and current setting judges that the protected circuit is
No generation disconnection fault includes:
If the phase current magnitude is less than the current setting, determine that disconnection fault occurs；
If the phase current magnitude is more than or equal to the current setting, determine that no failure that breaks occurs.
Second aspect of the present invention provides another high voltage overhead lines breaking protection recognition methods, includes the following steps:
Obtain the current information of protected circuit；
Phase current magnitude is calculated according to the current information；
The phase current magnitude and current setting are compared；
If the phase current magnitude is more than or equal to the current setting, it is determined that the protected circuit works normally；
If the phase current magnitude is less than the current setting, judge the current information with the presence or absence of high-frequency current
Signal, according to whether judging whether the protected circuit occurs disconnection fault there are high-frequency current signal.
Wherein, described according to whether judging whether the protected circuit occurs disconnection fault packet there are high-frequency current signal
It includes:
High-frequency current signal if it exists, it is determined that the protected circuit works normally；
High-frequency current signal if it does not exist then calculates phase current magnitude according to the current information, and according to the phase electricity
The comparing result of stream amplitude and current setting judges whether the protected circuit occurs disconnection fault.
Wherein, the current setting is calculated by the following formula to obtain:
Iset=KrelIc
Wherein, Krel=1.1~1.2, IcFor the capacitance current of protected circuit.
Third aspect present invention provides one kind also for realizing high voltage overhead lines breaking protection identification side described in first aspect
The device of method characterized by comprising
Protective relaying device is configured as obtaining the current information of protected circuit；
Signal processing unit is configured as judging the current information with the presence or absence of high-frequency current signal；
High-frequency current signal if it exists, it is determined that the protected circuit works normally；
High-frequency current signal if it does not exist then calculates phase current magnitude according to the current information, and according to the phase electricity
The comparing result of stream amplitude and current setting judges whether the protected circuit occurs disconnection fault.
Fourth aspect present invention also provides a kind of to be identified for realizing high voltage overhead lines breaking protection described in second aspect
The device of method, comprising:
Protective relaying device is configured as obtaining the current information of protected circuit；
Computing unit is configured as calculating phase current magnitude according to the current information；
Comparing unit is configured as comparing the phase current magnitude and current setting；
Judging unit is configured to respond to the phase current magnitude more than or equal to the current setting, it is determined that institute
State protected circuit normal work；Also, it is less than the current setting in response to the phase current magnitude, then according to whether depositing
Judge whether the protected circuit occurs disconnection fault in high-frequency current signal.
Above technical scheme at least has the advantages that
When short trouble occurs for route, since there are many transmission channel high frequency attenuation, it may cause hf channel disconnection, be
It avoids short trouble being mistaken for disconnection fault, needs sample rate current information and introduce current amplitude criterion, by current amplitude
It is compared to form electric current criterion with current setting.It will lead to carrier channel while above technical scheme is using disconnection fault
This feature is disconnected, the high-frequency current signal of electric wave carrier is accessed into protective relaying device, it, can be in conjunction with current amplitude criterion
Realize disconnection fault identification.This method directly detects carrier channel, not by line transmission power to protection reliability
It influences, solves the problems, such as that disconnection fault is difficult under underloading or no-load condition.
In addition, other beneficial effects will be explained further below.
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 only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow chart of one the method for the embodiment of the present invention.
Fig. 2 is high voltage overhead lines system construction drawing described in the embodiment of the present invention one.
Fig. 3 is the flow chart of two the method for the embodiment of the present invention.
Component labelling in figure:
The first equivalent power supply of 1-, the first bus of 2-, 3- protected circuit, the second bus of 4-, the second equivalent power supply of 5-, 6-
One protective relaying device, the second protective relaying device of 7-.
Specific embodiment
Various exemplary embodiments, feature and the aspect of the disclosure are described in detail below with reference to attached drawing.It is identical in attached drawing
Appended drawing reference indicate element functionally identical or similar.Although the various aspects of embodiment are shown in the attached drawings, remove
It non-specifically points out, it is not necessary to attached drawing drawn to scale.
In addition, in order to better illustrate the present invention, numerous details is given in specific embodiment below.This
Field is it will be appreciated by the skilled person that without certain details, the present invention equally be can be implemented.In some instances, for this
Means known to the technical staff of field, element and circuit are not described in detail, in order to highlight purport of the invention.
As shown in Figure 1, the embodiment of the present invention one provides a kind of high voltage overhead lines breaking protection recognition methods, it is based on Fig. 2
Shown in high voltage overhead lines system structure, referring to Fig.2, the high voltage overhead lines system include the first equivalent power supply 1, the first bus
2,3 second bus 4 of protected circuit, the second equivalent power supply 5, the first protective relaying device 6 and the second protective relaying device 7, institute
It states the first equivalent power supply 1 to be connected with the first bus 2, first bus 2 is connected by protected circuit 3 with the second bus 4, institute
The second bus 4 is stated to be connected with the second equivalent power supply 5；First protective relaying device 6 is mounted on 2 exit of the first bus, institute
It states the second protective relaying device 7 and is mounted on 4 exit of the second bus.
Wherein, power carrier is the distinctive communication mode of electric system, and power carrier communication refers to using existing power line,
Analog or digital signal is carried out to the technology of high-speed transfer by carrier system.Maximum feature is not need to set up network again,
As long as live wire, data transmitting can be carried out.
Based on the above high voltage overhead lines system structure, consider that there are three independent hf channels for protected circuit tool, it is each
A hf channel uses " phase-ground " coupled modes, wherein the working method of carrier channel is normally to have high-frequency current mode, i.e.,
When operating normally, sender is in and transmits state, that is, there is high-frequency current signal.The protective relaying device of protected circuit is pressed
Fixed sample period acquires current information, and the current information includes three-phase high-frequency current information and line current information.
Refering to fig. 1, high voltage overhead lines breaking protection recognition methods described in embodiment one specifically comprises the following steps:
The current information of S11 acquisition protected circuit；
S12 judges the current information with the presence or absence of high-frequency current signal；Carrier channel availability mark position S is setφ(φ
=a, b, c), 1 indicates that channel is normal, and 0 indicates that channel disconnects；
S13 high-frequency current signal, i.e. S if it existsφ=1, it is determined that the protected circuit works normally；
S14 high-frequency current signal if it does not exist then calculates phase current magnitude according to the current informationAnd according to the phase current magnitudeWith current setting Iset(φ=a, b,
C) comparing result judges whether the protected circuit occurs disconnection fault.
Wherein, the quilt is judged according to the comparing result of the phase current magnitude and current setting in the step S14
Whether protection circuit occurs disconnection fault
If the S141 phase current magnitude is less than the current setting, determine that disconnection fault occurs；
If the S142 phase current magnitude is more than or equal to the current setting, determine that no failure that breaks occurs.
For example, A phase disconnection fault (f1 in Fig. 2) occurs at positive 30% distance of the first protective relaying device of setting.For
First protective relaying device,First protective relaying device issues trip command movement in the open circuit of this side
Device tripping；For the second protective relaying device,It is dynamic that second protective relaying device issues trip command
Make in this side circuit breaker trip, i.e. disconnection fault is cut off.
In another example the second protective relaying device of setting reversely exports and A phase disconnection fault (f2 in Fig. 2) occurs.Outside due to area
The hf channel of failure, protected circuit is normal.For the first protective relaying device, Sa=1, the first protective relaying device is motionless
Make；For the second protective relaying device, Sa=1, the second protective relaying device is failure to actuate, i.e. external area error not malfunction.
Specifically, since there are many transmission channel high frequency attenuation, it is logical to may cause high frequency when short trouble occurs for route
Road disconnects, and in order to avoid short trouble is mistaken for disconnection fault, the present embodiment method sample rate current information simultaneously introduces electric current width
It is worth criterion, is compared current amplitude to form electric current criterion with current setting.In conjunction with high-frequency current signal and the electric current
Whether criterion, comprehensive descision protected circuit occur broken string event.
The original power-line carrier channel of route is utilized in the present embodiment, in the case where not increasing equipment investment, realizes
The identification of high-tension overhead line disconnection fault.
Wherein, current setting judges the standard value to compare when tripping with actual current, current calibration in relay protection
Value is artificially to provide, according to circuit, the calculated value of power grid ability to bear.
As shown in figure 3, second embodiment of the present invention provides another high voltage overhead lines breaking protection recognition methods, including it is as follows
Step:
The current information of S21 acquisition protected circuit；
S22 calculates phase current magnitude according to the current information；
S23 compares the phase current magnitude and current setting；
If the S24 phase current magnitude is more than or equal to the current setting, it is determined that the normal work of protected circuit
Make；
If the S25 phase current magnitude is less than the current setting, judge the current information with the presence or absence of high frequency
Current signal, according to whether judging whether the protected circuit occurs disconnection fault there are high-frequency current signal.
Wherein, according to whether judging whether the protected circuit occurs there are high-frequency current signal in the step S25
Disconnection fault includes:
S251 high-frequency current signal if it exists, it is determined that the protected circuit works normally；
S252 high-frequency current signal if it does not exist then calculates phase current magnitude according to the current information, and according to described
The comparing result of phase current magnitude and current setting judges whether the protected circuit occurs disconnection fault.
Specifically, two the method for embodiment is similar with one the method for embodiment, all it is sample rate current information and draws
Enter current amplitude criterion, is compared current amplitude to form electric current criterion with current setting.In conjunction with high-frequency current signal and
Whether the electric current criterion, comprehensive descision protected circuit occur broken string event.Therefore two method of embodiment other be not described in detail in
Appearance sees the acquisition of one method of embodiment, and details are not described herein again.
Wherein, the current setting is calculated by the following formula to obtain:
Iset=KrelIc
Wherein, Krel=1.1~1.2, IcFor the capacitance current of protected circuit.
The embodiment of the present invention three provides one kind also for realizing high voltage overhead lines breaking protection identification side described in first aspect
The device of method characterized by comprising
Protective relaying device is configured as obtaining the current information of protected circuit；
Signal processing unit is configured as judging the current information with the presence or absence of high-frequency current signal；
High-frequency current signal if it exists, it is determined that the protected circuit works normally；
High-frequency current signal if it does not exist then calculates phase current magnitude according to the current information, and according to the phase electricity
The comparing result of stream amplitude and current setting judges whether the protected circuit occurs disconnection fault.
It should be noted that for the device disclosed in the embodiment three, since it is opposite with method disclosed in embodiment one
It answers, so being described relatively simple, reference may be made to the description of the method.
The embodiment of the present invention four also provides a kind of to be identified for realizing high voltage overhead lines breaking protection described in second aspect
The device of method, comprising:
Protective relaying device is configured as obtaining the current information of protected circuit；
Computing unit is configured as calculating phase current magnitude according to the current information；
Comparing unit is configured as comparing the phase current magnitude and current setting；
Judging unit is configured to respond to the phase current magnitude more than or equal to the current setting, it is determined that institute
State protected circuit normal work；Also, it is less than the current setting in response to the phase current magnitude, then according to whether depositing
Judge whether the protected circuit occurs disconnection fault in high-frequency current signal.
It should be noted that for the device disclosed in the example IV, since it is opposite with method disclosed in embodiment two
It answers, so being described relatively simple, reference may be made to the description of the method.
Through the descriptions of above embodiments it is found that when short trouble occurs for route, very due to transmission channel high frequency attenuation
It is more, it may cause hf channel disconnection, in order to avoid short trouble is mistaken for disconnection fault, needs sample rate current information and draw
Enter current amplitude criterion, is compared current amplitude to form electric current criterion with current setting.Above technical scheme utilizes disconnected
It will lead to carrier channel while line failure and disconnect this feature, the high-frequency current signal of electric wave carrier is accessed into relay protection
Disconnection fault identification may be implemented in conjunction with current amplitude criterion in device.This method directly detects carrier channel, not by
Influence of the line transmission power to protection reliability, solve that the disconnection fault under underloading or no-load condition is difficult to asks
Topic.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.The selection of term used herein, purport
In principle, the practical application or to the technological improvement in market for best explaining each embodiment, or make the art its
Its those of ordinary skill can understand each embodiment disclosed herein.
Claims (7)
1. a kind of high voltage overhead lines breaking protection recognition methods, which comprises the steps of:
Obtain the current information of protected circuit；
Judge the current information with the presence or absence of high-frequency current signal；
High-frequency current signal if it exists, it is determined that the protected circuit works normally；
High-frequency current signal if it does not exist then calculates phase current magnitude according to the current information, and according to the phase current width
The comparing result of value and current setting judges whether the protected circuit occurs disconnection fault.
2. high voltage overhead lines breaking protection recognition methods as described in claim 1, which is characterized in that described according to the phase electricity
The comparing result of stream amplitude and current setting judges whether the protected circuit occurs disconnection fault and include:
If the phase current magnitude is less than the current setting, determine that disconnection fault occurs；
If the phase current magnitude is more than or equal to the current setting, determine that no failure that breaks occurs.
3. a kind of high voltage overhead lines breaking protection recognition methods, which comprises the steps of:
Obtain the current information of protected circuit；
Phase current magnitude is calculated according to the current information；
The phase current magnitude and current setting are compared；
If the phase current magnitude is more than or equal to the current setting, it is determined that the protected circuit works normally；
If the phase current magnitude is less than the current setting, judge that the current information is believed with the presence or absence of high-frequency current
Number, according to whether judging whether the protected circuit occurs disconnection fault there are high-frequency current signal.
4. high voltage overhead lines breaking protection recognition methods as claimed in claim 3, which is characterized in that it is described according to whether in the presence of
High-frequency current signal judges whether the protected circuit occurs disconnection fault and include:
High-frequency current signal if it exists, it is determined that the protected circuit works normally；
High-frequency current signal if it does not exist then calculates phase current magnitude according to the current information, and according to the phase current width
The comparing result of value and current setting judges whether the protected circuit occurs disconnection fault.
5. high voltage overhead lines breaking protection recognition methods as claimed in claim 1 or 3, which is characterized in that the current calibration
Value is calculated by the following formula to obtain:
Iset=KrelIc
Wherein, Krel=1.1~1.2, IcFor the capacitance current of protected circuit.
6. a kind of device for realizing high voltage overhead lines breaking protection recognition methods of any of claims 1 or 2, feature exist
In, comprising:
Protective relaying device is configured as obtaining the current information of protected circuit；
Signal processing unit is configured as judging the current information with the presence or absence of high-frequency current signal；
High-frequency current signal if it exists, it is determined that the protected circuit works normally；
High-frequency current signal if it does not exist then calculates phase current magnitude according to the current information, and according to the phase current width
The comparing result of value and current setting judges whether the protected circuit occurs disconnection fault.
7. a kind of device for realizing high voltage overhead lines breaking protection recognition methods described in claim 3 or 4, feature exist
In, comprising:
Protective relaying device is configured as obtaining the current information of protected circuit；
Computing unit is configured as calculating phase current magnitude according to the current information；
Comparing unit is configured as comparing the phase current magnitude and current setting；
Judging unit is configured to respond to the phase current magnitude more than or equal to the current setting, it is determined that the quilt
Protection circuit works normally；Also, it is less than the current setting in response to the phase current magnitude, then according to whether existing high
Frequency current signal judges whether the protected circuit occurs disconnection fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811080926.0A CN109378797B (en) | 2018-09-17 | 2018-09-17 | High-voltage overhead line disconnection protection and identification method |
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| CN201811080926.0A CN109378797B (en) | 2018-09-17 | 2018-09-17 | High-voltage overhead line disconnection protection and identification method |
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Cited By (2)
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| CN110008917A (en) * | 2019-04-11 | 2019-07-12 | 国网河南省电力公司电力科学研究院 | Fault detection method based on the relay protection device constant value forms data that table understands |
| CN110794340A (en) * | 2019-11-13 | 2020-02-14 | 深圳供电局有限公司 | Disconnection protection method and circuit for high-voltage overhead line |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109378797B (en) | 2020-09-18 |
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