CN110187234A - A kind of mixed power transmission line fault distance-finding method - Google Patents
A kind of mixed power transmission line fault distance-finding method Download PDFInfo
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- CN110187234A CN110187234A CN201910466409.5A CN201910466409A CN110187234A CN 110187234 A CN110187234 A CN 110187234A CN 201910466409 A CN201910466409 A CN 201910466409A CN 110187234 A CN110187234 A CN 110187234A
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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
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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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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- 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
- G01R31/088—Aspects of digital computing
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Abstract
The invention discloses a kind of mixed power transmission line fault distance-finding method, the mixed power transmission line is the mixed power transmission line for including overhead line and cable；Wherein, the joint of the overhead line and the cable is equipped with ranging slave station, and each ranging slave station is connect with distance measurement Master station；The described method includes: the ranging slave station acquires fault traveling wave arrival time, and the arrival time of the fault traveling wave is sent to the distance measurement Master station；The distance measurement Master station calculates the time difference that the fault traveling wave reaches every section of route both ends according to the arrival time of the fault traveling wave, and determines route locating for fault point according to the time difference；When the route locating for the fault point is the overhead line, the position of the fault point is calculated using both-end traveling wave method；When the route locating for the fault point is the cable, the position of the fault point is determined using electric cable failure detector.Using the embodiment of the present invention, the range accuracy of mixed power transmission line can be effectively improved.
Description
Technical field
The present invention relates to high voltage power transmission technical field more particularly to a kind of mixed power transmission line fault distance-finding methods.
Background technique
In recent years, high voltage power transmission technology obtains fast development, and high voltage power transmission includes high-voltage AC transmission and high voltage direct current
Transmission of electricity.High voltage power transmission has played increasingly important role in remote, large capacity transmission and downtown area field of power transmission.It is high
The route of pressure transmission of electricity mainly uses overhead line, and certain fields use cable.With the expansion of high voltage power transmission technical application range, answer
With scene also come more complicated, there is the situation for needing the joint line using overhead line and cable connection, such as island networking, city
Midtown power supply etc..In seabed and urban central zone, need to use cable, and in island land and city suburbs, it uses
Overhead line is more economic and practical.
High voltage power transmission engineering failure distance measuring method is to install range unit at route both ends before this, is reached using fault traveling wave
The time of distance ranging terminal calculates fault point using single-ended method, and for the transmission line of electricity of pure overhead line, range accuracy be can achieve
± 500 meters or a positive and negative tower are away from range accuracy is higher.However, for overhead line-cable connection joint line, failed row
Wave has refraction and reflection at line joint, and transmission traveling wave has certain decaying, if cable length is longer, cable is to traveling wave
Also very strong attenuation is had, causes the travelling wave signal for reaching route both ends smoother, range unit monitors traveling wave
Moment, there is a certain error with exact time, reduces distance measurement result.If joint line connector quantity is more or cable compared with
It is long, travelling wave signal deep fades will be caused, or even there are the risk that range unit can not detect fault traveling wave signal, can not give
Distance measurement result out.
In addition, single-ended traveling wave method needs to acquire first fault traveling wave and with the fault traveling wave between the back wave of fault point
Time difference calculate fault distance.This method requirement, distance ranging terminal allow for accurately and reliably detecting caused by failure
Back wave of the 1st direct wave surge in fault point.But for overhead lines combined with cable, back wave at line joint
Interference may cause distance ranging terminal and be difficult to accurately and reliably detect the back wave of fault point, cause the decline of range accuracy,
Even can not ranging, the line patrolling maintenance time will be caused to be significantly increased, increase corresponding human cost, extend the interruption maintenance of system
Time.
Summary of the invention
The purpose of the embodiment of the present invention is that providing a kind of mixed power transmission line fault distance-finding method, it is defeated that mixing can be effectively improved
The range accuracy of electric line.
To achieve the above object, the embodiment of the invention provides a kind of mixed power transmission line fault distance-finding methods, described mixed
Closing transmission line of electricity is the mixed power transmission line for including overhead line and cable；Wherein, the joint of the overhead line and the cable
Equipped with ranging slave station, each ranging slave station is connect with distance measurement Master station；The described method includes:
The ranging slave station acquires fault traveling wave arrival time, and the arrival time of the fault traveling wave is sent to described
Distance measurement Master station；
The distance measurement Master station calculates the fault traveling wave according to the arrival time of the fault traveling wave and reaches every section of route two
The time difference at end, and route locating for fault point is determined according to the time difference；
When the route locating for the fault point is the overhead line, the position of the fault point is calculated using both-end traveling wave method
It sets；
When the route locating for the fault point is the cable, the position of the fault point is determined using electric cable failure detector
It sets.
Compared with the prior art, in overhead lines combined with cable fault distance-finding method provided by the present invention, work as frame
When ceases to be busy or cable break down, fault zone is first determined, for overhead line failure, surveyed using this section of route both ends ranging slave station
The first fault traveling wave signal of amount, avoids decaying of the travelling wave signal on joint and cable, avoids the dry of reflection configuration
Disturb, range accuracy can reach ± 500 meters or a positive and negative tower away from.For cable fault, after line outage manipulated untwisted cable both ends with
The connector of overhead line, using the dedicated electric cable failure detector of cable, range accuracy is ± 300 meters available.Therefore, institute of the present invention
The method of offer can avoid decaying and reflection of the travelling wave signal on joint and cable after joint line breaks down
The interference of wave, range accuracy with higher save time and the human cost of line patrolling maintenance, are conducive to the quick extensive of system
It is multiple.
As an improvement of the above scheme, described that route locating for fault point is determined according to the time difference, it specifically includes:
When obtaining the mixed power transmission line and being in normal condition external area error traveling wave is by the threshold value of current line at present
Between；
When the time difference being equal to the threshold time, determine the fault point on the current line；When described
When time difference is less than the threshold time, determine the fault point not on the current line.
As an improvement of the above scheme, described that fault point is calculated using both-end traveling wave method, it specifically includes:
Institute is calculated according to the absolute time difference that the first fault traveling wave reaches the ranging slave station at overhead line both ends
State the distance between the ranging slave station that fault point reaches overhead line both ends；Meet following formula:
Wherein, v is the spread speed of the fault traveling wave；TMThe absolute of the end M ranging slave station is reached for the fault traveling wave
Time；TNThe absolute time of N-terminal ranging slave station is reached for the fault traveling wave；DMFAnd DNFThe respectively end M and N-terminal ranging slave station is arrived
The distance of fault point；L is the length of route MN.
As an improvement of the above scheme, it before the position that the fault point is determined using electric cable failure detector, also wraps
It includes:
Disconnect the connection of the cable ends Yu the overhead line.
As an improvement of the above scheme, the position that the fault point is determined using electric cable failure detector, it is specific to wrap
It includes:
Ranging is carried out to the cable in the two sides joint of the cable using the electric cable failure detector, obtains institute
State the position of fault point.
Detailed description of the invention
Fig. 1 is that the structure of joint line in a kind of mixed power transmission line fault distance-finding method provided in an embodiment of the present invention is shown
It is intended to；
Fig. 2 is a kind of flow chart of mixed power transmission line fault distance-finding method provided in an embodiment of the present invention；
Fig. 3 is fault traveling wave round in a kind of mixed power transmission line fault distance-finding method provided in an embodiment of the present invention
Schematic diagram；
Fig. 4 be in a kind of mixed power transmission line fault distance-finding method provided in an embodiment of the present invention distance measurement Master station and ranging from
The connection schematic diagram stood.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is joint line in a kind of mixed power transmission line fault distance-finding method provided in an embodiment of the present invention referring to Fig. 1, Fig. 1
Structural schematic diagram, the mixed power transmission line is the mixed power transmission line for including overhead line and cable；Wherein, the overhead line
It is equipped with ranging slave station with the joint of the cable, each ranging slave station is connect with distance measurement Master station.Further, the survey
It also may include multiple away from main website.
Referring to fig. 2, Fig. 2 is a kind of flow chart of mixed power transmission line fault distance-finding method provided in an embodiment of the present invention；
The described method includes:
The arrival time of S1, ranging slave station acquisition fault traveling wave, and the arrival time of the fault traveling wave is sent
To the distance measurement Master station；
S2, the distance measurement Master station calculate the fault traveling wave according to the arrival time of the fault traveling wave and reach every section of route
The time difference at both ends, and route locating for fault point is determined according to the time difference；
When S3, the route locating for the fault point are the overhead line, the fault point is calculated using both-end traveling wave method
Position；
When S4, the route locating for the fault point are the cable, the fault point is determined using electric cable failure detector
Position.
Specifically, in step sl, the ranging slave station, which is surveyed, completes travelling wave signal conversion, fault detection and differentiation, failure
Data sampling, added-time mark, storage, to items functions such as distance measurement Master station transmission fault data.
Specifically, in step s 2, the distance measurement Master station is completed to receive the fault data that the ranging slave station transmission comes, and
To failure data analysis, processing, the display of positioning result is saved, and in relation to data, the items function such as printing of waveform.It is described
Distance measurement Master station calculates the time difference that the fault traveling wave reaches every section of route both ends according to the arrival time of the fault traveling wave, and
Route locating for fault point is determined according to the time difference.
Preferably, described that route locating for fault point is determined according to the time difference, it specifically includes:
S21, the acquisition mixed power transmission line are in the normal condition threshold that external area error traveling wave passes through current line at present
It is worth the time；
S22, when the time difference be equal to the threshold time when, determine the fault point on the current line；When
When the time difference is less than the threshold time, determine the fault point not on the current line.
Wherein, the division outside the area area Nei Ji is divided by the protection scope of protection.Breaking down in protection scope is
Troubles inside the sample space, on the contrary it breaks down except protection scope, it is external area error.This be it is fixed according to protective nature, as Line Differential protect
Shield only protects this route, this line fault is troubles inside the sample space, and when other failures relevant to route, this protection can also generate phase
Information is closed, will not be acted, is external area error for this protection.Fault point described in the embodiment of the present invention is troubles inside the sample space
Whether thus the fault point of generation can be compared with external area error, to obtain the fault point on the current line.
Specifically, in step s3, when the route locating for the fault point is the overhead line, using both-end traveling wave method meter
Calculate the position of the fault point.It preferably, is a kind of mixed power transmission line failure provided in an embodiment of the present invention referring to Fig. 3, Fig. 3
Fault traveling wave round schematic diagram in distance measuring method；F is the fault traveling wave, and M is the ranging slave station of described overhead line one end,
N is the ranging slave station of the overhead line other end, and L is the length of the overhead line.Preferably, described to use both-end traveling wave method meter
Fault point is calculated, is specifically included:
Institute is calculated according to the absolute time difference that the first fault traveling wave reaches the ranging slave station at overhead line both ends
State the distance between the ranging slave station that fault point reaches overhead line both ends；Meet following formula:
Wherein, v is the spread speed of the fault traveling wave；TMThe absolute of the end M ranging slave station is reached for the fault traveling wave
Time；TNThe absolute time of N-terminal ranging slave station is reached for the fault traveling wave；DMFAnd DNFThe respectively end M and N-terminal ranging slave station is arrived
The distance of fault point；L is the length of route MN.
Specifically, in step s 4, if failure occurs on cable, dedicated portable electric is used after line outage
Cable failure tester disconnects the connector of cable ends and overhead line, individually carries out ranging to cable in joint.Because of joint
Ranging slave station is mounted on overhead transmission line side, can decay when cable fault traveling wave passes through connector, causes travelling wave signal smooth, if adopting
With both-end traveling wave method, range accuracy is lower.The dedicated portable cable fault tester of cable can be moved manually, convenient for storage and
Installation.The tester only carries out ranging to cable, and range accuracy is higher, which does not reside at line in system charging operation
On the road, it needs to carry out ranging in cable ends after line outage.
Referring to fig. 4, Fig. 4 is distance measurement Master station in a kind of mixed power transmission line fault distance-finding method provided in an embodiment of the present invention
With the connection schematic diagram of ranging slave station.Phone is connected to by Modem/ network interface card between the ranging slave station and the distance measurement Master station
Net/wide area network carries out information exchange.
It is illustrated below in conjunction with specific embodiment:
(1) assume that ground short circuit failure occurs on the overhead line, using following distance measuring method: 4 ranging slave stations are equal
It is communicated with distance measurement Master station, the arrival time information of fault traveling wave is transmitted to distance measurement Master station by ranging slave station, and distance measurement Master station is sentenced
It makes failure to be located on the segment frame ceases to be busy, the travelling wave signal information acquired using the distance ranging terminal at the segment frame ceases to be busy both ends, to keep away
The interference for exempting from back wave calculates fault point using both-end traveling wave method；
Specific to the operating condition in the present embodiment, the route to break down is overhead line L1, then distance measuring method specifically: failure
After F1 occurs, the ranging slave station 1 and ranging slave station 2 of the two sides overhead line L1 will trigger failure wave-recording, because connector and cable attenuation are made
With influence, ranging slave station 3 and ranging slave station 4 are possible to triggering recording, and fault traveling wave arrival time point is recorded in 4 ranging slave stations
Not Wei T1, T2, T3, T4, ranging slave station 3 may not also trigger with ranging slave station 4.Wherein, if triggering recording and signal strength or weakness
Related, connector is not passed through in failure overhead transmission line two sides, and signal is very strong, can all trigger recording substantially, and cable fault traveling wave passes through
The decaying of one connector can also trigger record when reaching both ends substantially, but by after more than two connectors, signal decay it is more serious,
It is possible without triggering recording, can't detect travelling wave signal, cannot also provide traveling wave arrival time；
If ranging slave station 3, ranging slave station 4 trigger recording, ranging 1~ranging of slave station slave station 4 is logical with distance measurement Master station respectively
Letter, distance measurement Master station are computed each section of route traveling wave and pass through time (time difference that the i.e. described fault traveling wave reaches every section of route both ends)
△ t1, △ t2, △ t3:
△ t1=T1-T2；
△ t2=T2-T3；
△ t3=T3-T4；
And be compared with external area error traveling wave under normal condition by threshold time t1, t2, t3 of this section of route,
In, t1, t2, t3 meet (spread speed that V1~V3 is respectively fault traveling wave):
T1=L1/V1；
T2=L2/V2；
T3=L3/V3；
If ranging slave station 3, ranging slave station 4 do not trigger recording, at the time of will be unable to detect that fault traveling wave reaches this,
But the distance measurement Master station at ranging slave station 1 remain to by ranging slave station 1, ranging slave station 2 triggering after the travelling wave signal that detects calculate
△ t1 < t1 out determines failure and is located at L1 sections of overhead line, and handles ranging slave station 1, the collected fault traveling wave of ranging slave station 2
Arrival time information for the first time calculates fault point using traditional both-end traveling wave method.
(2) assume that ground short circuit failure occurs on cable, using following distance measuring method: 4 ranging slave stations and distance measurement Master station
Communication, is transmitted to distance measurement Master station for the arrival time information of first fault traveling wave, distance measurement Master station determines failure and is located at cable
Road.After line outage, using the dedicated Portable measuring device of cable, overhead line and cable connector are disconnected, in joint list
Ranging solely is carried out to cable；
Specific to the operating condition in the present embodiment, the route to break down is cable run L2, then distance measuring method specifically: therefore
After hindering F2 generation, the ranging slave station 2 and ranging slave station 3 of the two sides L2 will trigger failure wave-recording, and ranging slave station 1 has with ranging slave station 4
Recording may be triggered, the arrival time of first fault traveling wave is recorded.Ranging 1~ranging of slave station slave station 4 respectively with distance measurement Master station
Communication after distance measurement Master station is computed, because of △ t2 < t2, determines that failure is located at L2 sections of cable run.After line outage, electricity is disconnected
The connector at cable both ends and overhead line, using the dedicated electric cable failure detector of cable, in two sides joint individually to cable run
L2 carries out ranging, obtains distance measurement result.
It is worth noting that although the above various embodiments is with overhead line-three sections of cable-aerial line mixed power transmission line mould
It is introduced for type, but this is not offered as distance measuring method provided by the present invention and is only applicable to overhead line-cable-aerial
Three sections of mixed power transmission lines of line, those skilled in the art have the ability under the enlightenment of method provided by the present invention by this method
Through deformation application appropriate in other high voltage power transmission joint lines there are technical problem involved in background technique, all
Within the scope of the present invention.
Compared with the prior art, in overhead lines combined with cable fault distance-finding method provided by the present invention, work as frame
When ceases to be busy or cable break down, fault zone is first determined, for overhead line failure, surveyed using this section of route both ends ranging slave station
The first fault traveling wave signal of amount, avoids decaying of the travelling wave signal on joint and cable, avoids the dry of reflection configuration
Disturb, range accuracy can reach ± 500 meters or a positive and negative tower away from.For cable fault, after line outage manipulated untwisted cable both ends with
The connector of overhead line, using the dedicated electric cable failure detector of cable, range accuracy is ± 300 meters available.Therefore, institute of the present invention
The method of offer can avoid decaying and reflection of the travelling wave signal on joint and cable after joint line breaks down
The interference of wave, range accuracy with higher save time and the human cost of line patrolling maintenance, are conducive to the quick extensive of system
It is multiple.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (5)
1. a kind of mixed power transmission line fault distance-finding method, which is characterized in that the mixed power transmission line be include overhead line and
The mixed power transmission line of cable；Wherein, the joint of the overhead line and the cable is equipped with ranging slave station, each ranging
Slave station is connect with distance measurement Master station；The described method includes:
The arrival time of the ranging slave station acquisition fault traveling wave, and the arrival time of the fault traveling wave is sent to the survey
Away from main website；
The distance measurement Master station calculates the fault traveling wave according to the arrival time of the fault traveling wave and reaches every section of route both ends
Time difference, and route locating for fault point is determined according to the time difference；
When the route locating for the fault point is the overhead line, the position of the fault point is calculated using both-end traveling wave method；
When the route locating for the fault point is the cable, the position of the fault point is determined using electric cable failure detector.
2. mixed power transmission line fault distance-finding method as described in claim 1, which is characterized in that described according to the time difference
It determines route locating for fault point, specifically includes:
It obtains the mixed power transmission line and is in the normal condition threshold time that external area error traveling wave passes through current line at present；
When the time difference being equal to the threshold time, determine the fault point on the current line；When the time
When difference is less than the threshold time, determine the fault point not on the current line.
3. mixed power transmission line fault distance-finding method as described in claim 1, which is characterized in that described to use both-end traveling wave method
Fault point is calculated, is specifically included:
The event is calculated according to the absolute time difference that the first fault traveling wave reaches the ranging slave station at overhead line both ends
Barrier point reaches the distance between the ranging slave station at overhead line both ends；Meet following formula:
Wherein, v is the spread speed of the fault traveling wave；TMThe absolute time of the end M ranging slave station is reached for the fault traveling wave；
TNThe absolute time of N-terminal ranging slave station is reached for the fault traveling wave；DMFAnd DNFThe respectively end M and N-terminal ranging slave station is to failure
The distance of point；L is the length of route MN.
4. mixed power transmission line fault distance-finding method as described in claim 1, which is characterized in that described to be surveyed using cable fault
Before examination instrument determines the position of the fault point, further includes:
Disconnect the connection of the cable ends Yu the overhead line.
5. mixed power transmission line fault distance-finding method as claimed in claim 4, which is characterized in that described to be surveyed using cable fault
Examination instrument determines the position of the fault point, specifically includes:
Ranging is carried out to the cable in the two sides joint of the cable using the electric cable failure detector, obtains the event
Hinder the position of point.
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| CN110927514A (en) * | 2019-11-06 | 2020-03-27 | 国网陕西省电力公司 | Traveling wave distance measurement system and method suitable for hybrid power transmission line |
| CN111308275A (en) * | 2020-03-31 | 2020-06-19 | 南京辉腾电子科技有限公司 | Method for improving fault location precision of traveling wave method |
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| CN112540268A (en) * | 2020-12-28 | 2021-03-23 | 中天科技海缆股份有限公司 | Transmission line fault detection |
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