CN1025076C - Optical fiber laying structure for electric power cable line trouble occurrence location detecting system - Google Patents
Optical fiber laying structure for electric power cable line trouble occurrence location detecting system Download PDFInfo
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- CN1025076C CN1025076C CN 91104453 CN91104453A CN1025076C CN 1025076 C CN1025076 C CN 1025076C CN 91104453 CN91104453 CN 91104453 CN 91104453 A CN91104453 A CN 91104453A CN 1025076 C CN1025076 C CN 1025076C
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Abstract
In an optical fiber laying structure for an electric power cable line trouble occurrence location detecting system for detecting a trouble occurrence location by laying an optical fiber (5A to 5D) along an electric power cable line (1), the portion of the optical fiber laid along the cable of one of the two adjacent sections (4A to 4D) is superposed on the portion of the optical fiber laid along the cable of the other sections in an area in the vicinity of the boundary (7A to 7C) of the electric power cable line. Thus, if a temperature rise occurs due to a trouble such as a ground-fault in the boundary area, the temperature peak position, i.e., the trouble occurrence location can be detected by the two different optical fibers. Therefore, the trouble occurrence location in the boundary area can be accurately detected.
Description
The present invention relates to use the profile temperature sensor particularly the fault in power cable of Raman's backscattering optical fiber profile temperature sensor measurement the system of position appears, the optical fiber that relates more specifically to the Temperature Detector of profile temperature sensor therein is a kind of structure of laying along a power cable.
Recently, as a system that measures such as the appearance position of the faults such as (short circuits between power cable and ground that causes owing to the damage in insulation of power cable) of the earth fault in a power cable, a kind of system of the Raman's of use backscattering optical fiber profile temperature sensor succeeds in developing, for example, disclosed in the unsettled Japanese patent application No. 1-267428 that has announced, more precisely, Raman's backscattering optical fiber profile temperature sensor can be determined at its Temperature Detector optical fiber vertically on Temperature Distribution, when this optical fiber is when power cable is laid, to since a position on the power cable that the temperature that causes such as faults such as earth faults raises detect to determine that the position appears in its fault.
Principle with above-mentioned Raman's backscattering optical fiber profile temperature sensor measurement Temperature Distribution is as follows.When inciding in the optical fiber, penetrates light, because the trickle change of the refractive index of optical fiber, and the absorption of the molecule of optical fiber, atom pair light or re-emission, light is scattered.As scattered beam, the rayleigh scattering light with the identical wavelength of incident light is arranged, and with Raman's back-scattered light of incident light different wave length.Only by the molecule of optical fiber, the thermal vibration of atom produces in latter Raman backscattering, and its intensity depends on its temperature to a great extent.So, when the pulsed light with specific wavelength (being generally laser pulse) when being used as incident light, delay time lag and Raman's backscattering light intensity to the light that returns as scattered light are measured, and just can measure the make progress locational temperature of optical fiber of counterparty.
In order to lay a power cable, general sequence ground connects the power cable with predetermined length (unit cable).So, connecting portion is always arranged along this power cable.On the other hand, for power cable is safeguarded, seldom the whole piece power cable of long distance is safeguarded and monitored.Normally power cable is divided into a plurality of service section and each service section is safeguarded by each section or the personnel that be responsible for to safeguard.In this case, a boundary (safeguarding boundary point) is set usually between service section on the connecting portion of power cable.
So, as a detection fiber is laid and practical application along power cable, use the power cable fault of above-mentioned optical fiber distribution type temperature sensor traditional method of PALS (positioning and location system) to occur, its employed a kind of method is as shown in Figure 1.
In Fig. 1, one has a plurality of unit cable 3A, 3B, and 3C, with the power cable 1 of 3D, by connecting portion 2A, 2B and 2C are cascaded the constituent parts cable.This power cable 1 is divided into a plurality of service section 4A to 4D with the centre position of the connecting portion 2A to 2C of constituent parts cable 3A to 3D as boundary.Optical fiber 5A independently, 5B, 5C and 5D respectively at unit cable 3A to the 3D place of service section 4A to 4D along unit cable 3A, 3B, 3C and 3D laying.The end points of optical fiber 5A to 5D is connected respectively to profile temperature sensor processing unit 6A to 6D, and the latter itself is connected to a principal computer 9 again.
In above-mentioned system, a temperature peak position on the power cable, promptly the position appears in the fault such as an earth fault of this power cable, can promptly detect on the Dui Ying service section at each corresponding unit cable.
Because department and personnel along the responsible maintenance of above-mentioned each service section of power cable and supervision are different, be necessary to know in service section, to produce location of fault, especially need accurately to be determined at the location of fault that occurs near the service section adjacent boundary between the service section.On the other hand, on the connecting portion of the boundary between the service section through being normally placed in unit cable.The frequency that occurs fault such as earth fault on the connecting portion of unit cable is far above the frequency at the normal position of power cable.So, have strong desire to improve the accuracy of detection that the position fault of the connecting portion of unit cable occurred.
Raman's backscattering optical fiber profile temperature sensor be because its feature can quite accurately be measured the temperature peak position, and uses the power cable fault of this temperature sensor the fault that position detecting system can quite accurately measure such as earth fault to occur to occur.Yet, it also is not enough to accurately be determined near the boundary between the epimere fault, and the position to occur be to belong on the section on which limit, and have the fault that fault occurs on the connecting portion of unit cable of rate occurred frequently and occur on the viewpoint of position from accurately measuring, it still is not enough.
Thereby, an object of the present invention is provides a kind of detection fiber laying structure for a power cable fault detection system, it can eliminate the problems referred to above of traditional system, and can accurately be determined near the limit positions between the service section of a power cable or the position appears in the fault such as an earth fault on the bond sites between the unit cable.
In order to achieve the above object, according to a first aspect of the invention, be used to measure power cable fault that the position appears in fault and position detecting system occur and provide a kind of optical fiber laying structure for one with the optical fiber of the Temperature Detector of laying Raman's backscattering optical fiber profile temperature sensor along a power cable and a temperature raised position measuring this power cable, it is characterized in that, this power cable is divided into a plurality of sections, in each section, lay independently optical fiber along this power cable, and near each corresponding boundary of these sections, the part of the optical fiber of laying along one of adjacent section is folded being located at along on the part of the optical fiber of another section laying of adjacent segment.
In order to achieve the above object, according to a second aspect of the invention, being one is used to measure the power cable fault that the position appears in fault and position detecting system occurs, provide a kind of optical fiber laying structure with optical fiber of the Temperature Detector of laying Raman's backscattering optical fiber profile temperature sensor along power cable and the temperature raised position of measuring this power cable, it is characterized in that, this power cable comprises the unit cable of a plurality of series connection, the individual fibers of laying along described unit cable, and the part of the optical fiber of laying along adjacent unit cable is on the folded part that is provided with the optical fiber of laying along the adjacent cells cable at a connecting portion place of unit cable.
In the optical fiber laying structure according to a first aspect of the invention, near the boundary of power cable folded being located at along on the fiber section of another section laying along the part of the detection fiber of a laying in two adjacent sections.So, because earth fault caused that a temperature raises if in the boundary zone such as one, temperature peak position then, promptly the position appears in fault, can be detected by two different optical fiber.As mentioned above, when a fault position occurs and detected by two different optical fiber, only compared by a detected situation of optical fiber with this accident, its accuracy of detection is to have promoted considerablely.For example, even always clearly do not occur by the resulting temperature peak of an optical fiber position, it can obtain clarifying by the data of stack from two optical fiber, even perhaps the temperature peak data that obtain from optical fiber have departed from its actual position, can reduce error by two resulting position datas of optical fiber are averaged.So the position appears in the fault in the boundary zone accurately to be measured, and this fault occur the position belong to actually in two sections which the section also can accurately judge.
In the optical fiber laying structure according to a second aspect of the invention, the part of the detection fiber of laying along one of two unit cables is folded being located on the part with many detection fiber of laying by another unit cable of each upper edge, coupling part of the power cable of connecting portion series connection.Therefore, in the time of on a temperature that causes owing to the fault such such as earth fault raises the connecting portion that appears at unit cable, this temperature peak position, promptly the position to occur detected by two different optical fiber for this fault, thereby the position appears in the fault that accurately is determined in the connecting portion.
Illustrated as top that in the power cable of reality, the connecting portion of unit cable was exactly the boundary between the service section usually.Therefore, in this case, by two optical fiber the mensuration that the position appears in the fault in the boundary zone is equivalent to the mensuration that by two optical fiber the fault in the connecting portion is occurred the position in a second aspect of the present invention in a first aspect of the present invention.In other words, in this case, what occur in the boundary area part is the same such as coexist such fault of occurring in the connecting portion of the such fault of earth fault, can accurately measure the position of its appearance.
According to a third aspect of the invention we, position detecting system occurs a kind of optical fiber laying structure is provided to being used to measure a power cable fault that the position appears in fault with the optical fiber of the Temperature Detector of laying Raman's backscattering optical fiber profile temperature sensor along power cable and the temperature raised position of measuring power cable, it is characterized in that, this power cable is divided into a plurality of sections, and make the part of optical fiber form a surplus part along the optical fiber longitudinal direction, this surplus part and cable vertically on location independent, and these surpluses partly are to be arranged at least near the part of the power cable the boundary of the section of this power cable.
According to a forth aspect of the invention, position detecting system occurs a kind of optical fiber laying structure is provided to being used to measure a power cable fault that the position appears in fault with the optical fiber of the Temperature Detector of laying Raman's backscattering optical fiber profile temperature sensing along power cable and the temperature raised position that detects this power cable, it is characterized in that, this power cable comprises the unit cable of a plurality of series connection, and make at least a portion of optical fiber form a surplus part along the optical fiber longitudinal direction, the position (distance) of this surplus part and the cable power cable on vertically is irrelevant, and these surpluses partly are to be arranged at least near a part of power cable of each connecting portion of unit cable.
In a third aspect of the present invention optical fiber laying structure, with the lengthwise position of power cable irrespectively, part on detection fiber is vertical is set to the surplus part, and these surpluses partly are on the part that is arranged at least near the zone of the boundary of power cable.In other words, power cable fault in this pattern occurs in the position detecting system, optical fiber is laid along power cable, the temperature peak position that makes the lengthwise position of optical fiber will measure for optical fiber corresponding to the lengthwise position (distance) of power cable provides the position corresponding to power cable (distance), whereby, measure the temperature peak position, promptly the position appears in the fault of power cable.
In the situation of a fourth aspect of the present invention, surplus partly is to provide near the part the boundary zone at least on the optical fiber, to eliminate the corresponding relation of this part for the lengthwise position of power cable.Because surplus partly is irrelevant with the temperature peak of power cable, near the visibility boundary is measured precision owing to surplus existence partly is improved.
More particularly, in the time of near the temperature that causes owing to the fault such such as earth fault raises the boundary that appears at power cable, if surplus partly is provided with as top and is provided with on optical fiber said, can not clearly judge the temperature peak position, be which side that the position appears at boundary appears in fault, but when being provided with above-mentioned surplus part, for example just in time at the optical fiber place corresponding to the position of this boundary, accuracy of detection has just improved amount corresponding to the length of this surplus part to judge clearly the temperature peak position belongs to which side of boundary.
In the optical fiber laying structure of a fourth aspect of the present invention, partly be near the part that is arranged at least each connecting portion of the power cable with a plurality of unit cables of connecting by the connecting portion of unit cable with the irrelevant surplus of power cable lengthwise position.Thereby near the visibility connecting portion is measured precision owing to this surplus existence partly is improved.
More particularly, on the middle position at connecting portion for example, when being provided with the surplus part of optical fiber, just can clearly judge the temperature peak position, promptly fault the position occurs and belongs to which side as the middle position of the connecting portion of boundary.When all being provided with the surplus part of optical fiber on the end positions for example at connecting portion, just can clearly judge the temperature peak position, promptly the foreign side that the position is arranged in connecting portion or is positioned at connecting portion appears in fault.
In the power cable of reality, illustrate that as top the connecting portion of unit cable often is exactly the boundary between the service section.Therefore, the surplus part of optical fiber in partly being equivalent in a second aspect of the present invention near the part of the power cable connecting portion at least, is set in a first aspect of the present invention in this case, at least in the surplus that optical fiber is set near the part of the power cable the boundary.In other words, in this case, can accurately be determined near the boundary and the part of connecting portion in the position appears such as the such fault of earth fault.
According to a fifth aspect of the invention, position detecting system occurs a kind of optical fiber laying structure is provided to being used to measure a power cable fault that the position appears in fault with the optical fiber of the Temperature Detector of laying Raman's backscattering optical fiber profile temperature sensor along power cable and a temperature raised position measuring this power cable, it is characterized in that, this power cable is divided into a plurality of sections, and two or more parts of same optical fiber in the vertical are to be laid near the boundary of these sections superimposedly.
According to a sixth aspect of the invention, position detecting system occurs a kind of optical fiber laying structure is provided to being used to measure a power cable fault that the position appears in fault with the optical fiber of the Temperature Detector of laying Raman's backscattering optical fiber profile temperature sensor along power cable and a temperature raised position measuring this power cable, it is characterized in that, this power cable comprises the unit cable of a plurality of series connection, and two or more different pieces of same optical fiber in the vertical are in the superimposed connecting portion that is laid in the constituent parts cable.
In optical fiber laying structure according to a fifth aspect of the invention, two or more different parts of same detection fiber are near the superimposed boundary that is laid in this cable the zone.Therefore, if appear at this boundary zone because the temperature that causes such as the such fault of earth fault rises, this temperature peak position, promptly fault the position occurs and can be measured by two or more parts of same optical fiber.As mentioned above, when this fault the position occurs and measured by two or more parts of same optical fiber, compare with the situation that this fault is measured by only part of optical fiber, its accuracy of detection is to have improved considerablely.For example, even the temperature peak position that optical fiber obtains in the boundary zone does not always clearly occur, it can be by stack from obtaining clarifying corresponding to two of the optical fiber in this boundary zone or two above partial data, even perhaps depart from its actual position in the temperature peak position data that obtains from optical fiber, the position data that gets by two or more parts to optical fiber averages, and just can reduce error.Therefore, the position appears in the fault in the boundary zone just can accurately be measured, and can judge accurately that this fault the position occurs and belongs to which section.
In optical fiber laying structure according to a sixth aspect of the invention, two or more parts of same detection fiber are superimposed each connecting portion places that is laid in the power cable with many unit cables by connecting portion series connection in the vertical.Therefore, in the time of on the temperature that causes owing to the fault such such as earth fault raises the connecting portion that appears at unit cable, this temperature peak, be that fault the position occurs and recorded by two or more different parts of same optical fiber, whereby, the position appears in the fault of accurately having measured in connecting portion in the same manner described above.
In the power cable of reality, two or more parts of same optical fiber are determined at fault in the boundary zone position to occur are to be equivalent in a sixth aspect of the present invention the fault that two or more parts by same optical fiber are determined in the connecting portion position to occur in a fifth aspect of the present invention.In other words, in this case, the position occurring such as the such fault of earth fault can accurately measure in the part of boundary zone and connecting portion.
Other purpose of the present invention and advantage will propose in explanation subsequently, and more or less be self-evident from explanation, perhaps can be by practice of the present invention is understood.Purpose of the present invention and advantage can be by means and system's realization and the acquisitions of being pointed out particularly in appending claims.
The accompanying drawing that comprises in this manual and constitute the part of this instructions shows the present preferred embodiment of the present invention, and in conjunction with general explanation recited above and the detailed description to preferred embodiment given below, is used to explain principle of the present invention.
Fig. 1 illustrates one to be used for the synoptic diagram of example that the detection fiber laying structure of position detecting system appears in the conventional electric power cable fault;
Fig. 2 illustrates according to of the present invention and is used for the synoptic diagram of general layout of an embodiment that a detection fiber laying structure of position detecting system appears in a power cable fault;
Fig. 3 A and 3B are the front elevation of the major part of the embodiment in the difference exploded view 2;
Fig. 4 is for being used for the block diagram of layout that the processing unit of position detecting system appears in the power cable fault among Fig. 2;
Fig. 5 and 6 is respectively the front elevation of major part of other embodiment of the detection fiber laying structure of Fig. 2;
Fig. 7 is used for the synoptic diagram of general layout of another embodiment that a kind of detection fiber laying structure of position detecting system appears in a power cable fault for showing according to of the present invention;
Fig. 8 illustrates the block diagram of layout that a processing unit of position detecting system appears in the power cable fault that is used for Fig. 8;
Fig. 9 is the relation between optical fiber lengthwise position in the layout of exploded view 7 and the diagrammatic sketch of detected temperatures;
Figure 10 is the synoptic diagram of another embodiment of the detection fiber laying structure of exploded view 7;
Figure 11 is the relation between the lengthwise position of the optical fiber of the layout among displaying Figure 10 and the diagrammatic sketch of detected temperatures;
Figure 12 is the synoptic diagram of another embodiment of the detection fiber laying structure of exploded view 7;
Figure 13 is used for the synoptic diagram of general layout of another embodiment that a kind of optical fiber laying structure of position detecting system appears in a power cable fault for showing according to of the present invention;
Figure 14 the block diagram of layout of a processing unit of position detecting system occurs for showing the power cable fault be used for Figure 13;
Figure 15 is the relation between the lengthwise position of showing the optical fiber in the layout among Figure 13 and the diagrammatic sketch of detected temperatures;
Figure 16 to 18 is the front elevation of some embodiment of the major part of displaying detection fiber laying structure shown in Figure 13; And
Figure 19 is the synoptic diagram of another embodiment of the detection fiber laying structure of displaying Figure 13.
Fig. 2 has schematically showed the general layout according to an embodiment of first and second aspect of the present invention.
In Fig. 2, the prior art shown in similar Fig. 1, a power cable 1 has many by connecting portion 2A, 2B, the unit cable 3A to 3D that connects with 2C.This power cable 1 is to limit the mid point 2A to 2C of the connecting portion of 7A to 7C to punish into a plurality of service section 4A's to 4D as segment limit.Thereby connecting portion 2A to 2C becomes the boundary zone 8A to 8C of these sections respectively.Optical fiber 5A to 5D lays at the unit cable 3A to 3D of unit cable 3A to 3D upper edge service section 4A to 4D respectively.Optical fiber 5A to 5D is connected respectively to profile temperature sensor measurement unit 6A to 6D, and unit 6A to 6D itself is connected to a principal computer 9.Optical fiber 5A to 5D is respectively along connecting portion 2A to 2C, promptly on the part of the part of boundary zone 8A to 8C, i.e. and end points part or initially lay that part lays along what power cable 1 will be laid.Like this, two optical fiber are respectively along connecting portion 2A to 2C, and promptly boundary zone 8A to 8C lays.More particularly, article two, optical fiber 5A and 5B or 5C and 5D are that folded being laid in again along the connecting portion 2A(of power cable 1 is that segment limit is limit regional 8A to the initial part of laying of power cable 1) or connecting portion 2C(be that segment limit is limit regional 8C) on, as shown in Figure 3A, and the end of two optical fiber 5A and 5C is that folded to be laid in connecting portion 2B(again be that segment limit is limit regional 8B) on, shown in Fig. 3 B.
The configuration that is connected respectively to the profile temperature sensor processing unit 6A to 6D of optical fiber 5A to 5D can be with usually used the same, and be arranged to such shown in Fig. 3 A and the 3B usually.More particularly, processing unit 6A to 6D emission laser pulse light separates the Raman's back-scattered light that returns from optical fiber as the incident light to optical fiber 5A to 5D, and this Raman's back-scattered light of flash ranging amplifies and average these same light.As shown in Figure 4, each processing unit comprises that a lasing light emitter 10 is used to vibrate a laser pulse as the incident light to optical fiber, a driving circuit 11 is used to drive this lasing light emitter 10, branch units 12 is used for the scattered light of the reflection returned from each bar optical fiber 5A to 5D and isolates Raman's back-scattered light, cut-off filter 13 is used for removing the light composition except that the Raman light of Raman's back-scattered light, a photodetector 14 is used for converting the Raman's back-scattered light from cut-off filter 13 outputs to electric signal, amplifier 15 is used to amplify the electric signal from photodetector 14, and an averaging circuit 16 is used to improve the S/N of electric signal than (signal to noise ratio (S/N ratio)).Output signal (from the output signal of averaging circuit 16) from each processing unit 6A to 6D is applied on the principal computer 9, and principal computer 9 then sends a control signal to each processing unit 6.Principal computer 9 calculate from the output signal of processing unit 6A to 6D with obtain optical fiber 5A to 5D vertically on Temperature Distribution and further obtain the temperature peak position, promptly the position appears in the fault such as earth fault.At this moment, as mentioned above, limit regional 8A to 8C because the part of two optical fiber is stack ground along connecting portion 2A to 2C(segment limit) lay, principal computer 9 calculates from the next data that signal drew of the part of two optical fiber, and can accurately obtain the temperature peak position, promptly the position appears in the fault such as earth fault.
In addition, at above-mentioned Fig. 2 and 3A, among the embodiment shown in the 3B, boundary 7A to 7C is arranged on the center of connecting portion 2A to 2C.Yet the present invention is not limited to this specific embodiments.For example, boundary 7A to 7C can be arranged on the end of connecting portion 2A to 2C.In this case, boundary zone 8A to 8C can normally determine, is similar to the foregoing description, for forming in the zone that is made of connecting portion 2A to 2C.In addition, comprise the zone of part of boundary 7A to 7C both sides of the end points of connecting portion 2A to 2C, the zone of end that promptly comprises connecting portion and be connected to the unit cable of this connecting portion can the section of being defined as zone.
In addition, boundary 7A to 7C can be arranged on and connecting portion 2A to 2C separately independently on the position.In this case, leave the locational of connecting portion 2A to 2C because boundary zone 8A to 8C is arranged on, this embodiment is different with first and second aspect of the present invention.
The optical fiber laying structure of position detecting system appears in power cable fault according to a first aspect of the invention, and independently the part of two of measuring unit detection fiber is to lay along near the region overlapping the boundary of this power cable.Therefore, the temperature peak position, promptly the position occurring such as the fault of earth fault is to be measured by two optical fiber of independent measurement unit in this zone, thereby, this position can accurately be measured, and thereby can judge easily which of adjacent segment be this fault appear in.
The detection fiber laying structure of position detecting system appears in power cable fault according to a second aspect of the invention, and two fiber sections of independent measurement unit are along the overlapping laying of connecting portion of the unit cable of this power cable.Therefore, the temperature peak position, promptly such as the fault of earth fault occur the position this connecting portion by two independently optical fiber measure, can accurately measure thereby signal appears in the fault on the connecting portion with high fault (such as earth fault) frequency of occurrences.
Fig. 7 schematically illustrated according to the of the present invention the 3rd with the general layout of an embodiment of second aspect.
In Fig. 7, a power cable 1 has a plurality of unit cable 3A to 3C that connect with 2B by connecting portion 2A.This power cable 1 is to be divided into a plurality of service section 4A's to 4C as the connecting portion 2A of boundary 7A and 7B and the center of 2B.Therefore, this connecting portion 2A and 2B become boundary zone 8A respectively to 8B.Article one, optical fiber with lay along whole piece power cable 1.This optical fiber 5 is connected to a profile temperature sensor processing unit 6, and the latter itself is connected to a principal computer 9 again.Optical fiber 5 is boundary zone 8A on longitudinal component and at connecting portion 2A() middle position, promptly circularize on the boundary 7A, thereby this part constitutes a surplus part 52.The surplus part 51 and 52 that circularizes coiled is all isolated with connecting portion 2A and 2B.
The configuration that is connected to the profile temperature sensor processing unit 6 on the optical fiber 5 can be a conventionally form, and constitutes as shown in Figure 8 usually.More particularly, laser pulse light of processing unit 6 emissions is isolated Raman's back-scattered light as the incident light to optical fiber 5 from the light that optical fiber returns, and this Raman's back-scattered light of flash ranging amplifies and average this same light.As shown in Figure 8, this processing unit comprises that a lasing light emitter 10 is used to vibrate a laser as the incident light to optical fiber, a driving circuit 11 is used to drive this lasing light emitter 10, branch's light filter 12 is used for isolating Raman's back-scattered light from the optical fiber and the scattered light of the reflection of returning, cut-off filter 13 is used for removing the light composition except that the Raman light of Raman's back-scattered light, a photodetector 14 is used for converting the Raman's back-scattered light from cut-off filter 13 outputs to an electric signal, amplifier 15 is used to amplify the electric signal from photodetector 14, and averaging circuit 15 is used to improve the S/N ratio of electric signal.The output signal of processing unit 6 (output signal of averaging circuit 16) is applied on the principal computer 9, then is applied on the processing unit 6 from a control signal of principal computer 9.Principal computer 9 calculate from the output signal of processing unit 6 with obtain optical fiber 5 vertically on a Temperature Distribution and further obtain the temperature peak position, promptly the position appears in the fault such as earth fault.At this moment, as mentioned above, because surplus part the 51, the 52nd, at connecting portion 2A and regional 8A of 2B(boundary and 8B) middle position on, be to form on the vertical fiber section on boundary 7A and the 7B, computing machine 9 has been stored the length data of surplus part 51 and 52 in advance, the data that signal obtained that calculating gets from optical fiber are to obtain the temperature peak position, promptly the position appears in the fault such as earth fault, and can accurately measure which side of the mid point ( boundary 7A and 7B) that this position belongs to connecting portion 2A and 2B.For example, if because at connecting portion 2A(boundary zone 8A) the earth fault on right side (service section 4B one side) of boundary 7A of mid point caused a temperature peak, it can accurately measure this temperature peak position P is the right side that is positioned at the surplus part 51 of optical fiber 5.
Figure 10 illustrates another embodiment of a fourth aspect of the present invention.
In the embodiment of Figure 10, ring-type boundary member 51A, 51B; 52A, 52B are formed on the optical fiber 5 locational corresponding to the two ends of connecting portion 2A and 2B.
In this embodiment, if temperature peak appears near connecting portion 2A and the 2B.It can judge accurately that this temperature peak position belongs to connecting portion 2A, and the inside of 2B still is connecting portion 2A, the outside of 2B.Figure 11 show the lengthwise position of optical fiber when temperature peak position P appears among the connecting portion 2A and the temperature measured between relation.
Figure 12 shows the embodiment that combines of the embodiment among Fig. 1 and 10.In this case, ring- type surplus part 51,51A, 51B, 52,52A, 52B are formed on the optical fiber 5 on three positions, connecting portion 2A and 2B( boundary zone 8A and 8B) two ends and mid point ( boundary 7A and 7B).According to this embodiment, it can judge easily and accurately that the temperature peak position belongs to right side or the left side of boundary 7A and 7B, this is owing to exist the cause of surplus part 51 and 52 on the mid point ( boundary 7A and 7B) of connecting portion 2A and 2B, and it can judge easily and accurately that also the inside that this temperature peak benefit belongs to connecting portion 2A and 2B still is the outside of connecting portion 2A and 2B, this is owing to exist surplus part 51A, 51B simultaneously at the two ends of connecting portion 2A and 2B; 52A, the cause of 52B.
In the embodiment shown in above-mentioned Fig. 7, boundary 7A and 7B are arranged on the mid point of connecting portion 2A and 2B.Yet the present invention is not limited to this specific embodiments.For example, boundary 7A and 7B can be arranged on the end of connecting portion 2A and 2B.In this case, belong to which side of boundary 7A and 7B, comparatively it is desirable on the boundary of end that surplus with optical fiber partly is formed on connecting portion 2A and 2B in order accurately to judge the temperature peak position.
In addition, boundary 7A and 7B can be arranged on fully and connecting portion 2A and 2B separately independently on the position.In this case, this embodiment is with different with the embodiment of fourth aspect according to the of the present invention the 3rd.
The detection fiber laying structure of position detecting system appears in power cable fault according to a third aspect of the invention we, and surplus partly is formed on the longitudinal component of optical fiber at least near the part the boundary of power cable.Therefore, near the temperature peak position boundary is high such as the mensuration precision that the position appears in the fault of earth fault promptly, and therefore, can judge easily that in the section of adjacency which be fault occur occurring in.
The detection fiber laying structure of position detecting system appears in power cable fault according to a forth aspect of the invention, and surplus partly is formed on the part of connecting portion of unit cable of this power cable at least on the longitudinal component of optical fiber.Therefore, near this connecting portion temperature peak position, promptly the mensuration precision that the position occurs such as the fault of earth fault is high, and thereby can accurately be determined at the fault that has such as on the connecting portion of the high occurrence rate of fault of earth fault and the position occurs.
Figure 13 is schematically illustrated according to the of the present invention the 5th and the general layout of an embodiment of the 6th aspect.
In Figure 13, a power cable 1 has many unit cable 3A to 3C that connect with 2B by connecting portion 2A.This power cable 1 be on mid point, be divided into as the connecting portion 2A of boundary 7A and 7B and 2B a plurality of service section 4A to 4C and.Therefore, connecting portion 2A and 2B become boundary zone 8A to 8B respectively.Article one, optical fiber with lay along whole power cable 1.Optical fiber 5 is connected to a profile temperature sensor processing unit 6, and the latter itself is connected to a principal computer 9 again.With predetermined interval optical fiber 5 vertically on two parts 51 and 52 of being provided with to be laid in connecting portion 2A(overlappingly along optical fiber 5 be the regional 8A of boundary) on.In other words, after optical fiber 5 was laid on the part 51 along connecting portion 2A, a surplus part 52 was to return with the state that leaves this connecting portion 2A, and was laid in once more along on the part 52 of connecting portion 2A.With predetermined interval optical fiber 5 vertically on two parts 54 being provided be boundary zone 8B along connecting portion 2B(overlappingly in a similar fashion with 55) laying, and a surplus part 56 of leaving connecting portion 2B similarly is formed between the part 54 and 55 of optical fiber 5.
The configuration that is connected to the profile temperature sensor processing unit 6 of optical fiber 5 can be with usually used the same, and constitutes like that as shown in Figure 14 usually.More particularly, these processing unit 6 emission beam of laser pulsed lights are isolated a branch of Raman's back-scattered light as the incident light to optical fiber 5 from the light that optical fiber returns, and this Raman's back-scattered light of flash ranging amplifies and average this light beam.As shown in figure 14, this processing unit comprises that a lasing light emitter 10 is used to vibrate a laser pulse as the incident light to optical fiber, a driving circuit 11 is used to drive this lasing light emitter 10, branch units 12 is used for isolating Raman's back-scattered light from the scattered light of the reflection of returning from optical fiber 5, cut-off filter 13 is used for removing other light composition except the Raman light of Raman's back-scattered light, a photodetector 14 is used for converting Raman's back-scattered light of this cut-off filter 13 outputs to an electric signal, amplifier 15 is used to amplify the electric signal from photodetector 14, and averaging circuit 16 is used to improve the S/N ratio of this electric signal.The output signal of processing unit 6 (output signal of averaging circuit 16) acts on the principal computer 9, then acts on the processing unit 6 from a control signal of principal computer 9.The output signal of principal computer 9 calculation processing units 6 with obtain optical fiber 5 vertically on Temperature Distribution, and further obtain the temperature peak position, promptly the position appears in the fault such as earth fault.At this moment, as mentioned above, on optical fiber, have two parts 51,52 of different longitudinal directions; 54, the 55th, along connecting portion 2A and 2B(boundary zone 8A and 8B) overlapping laying, principal computer 9 calculates from the data that signal drew from these parts of optical fiber, and can accurately obtain the temperature peak position, and promptly the position appears in the fault such as earth fault.For example, if since caused such as a fault of earth fault appear at connecting portion 2A(boundary zone 8A) a temperature peak, as shown in figure 15, then temperature peak P1 and P2 appear on two parts 51 and 52 of optical fiber 5.Correspondingly, when principal computer 9 had been stored the overlap length of the length of surplus part 53 and part 51 and 52 in advance, computing machine 9 just can obtain the temperature peak position of connecting portion 2A.
In addition, in the above-described embodiment, two parts 51,52 of optical fiber 5; 54,55th, along connecting portion 2A and 2B( boundary zone 8A and 8B) overlapping laying.Yet the present invention is not limited to this specific embodiments.For example, having the fiber section of different longitudinal directions more than three or three can be along connecting portion 2A and 2B( boundary zone 8A and 8B) overlapping laying.For example, as shown in figure 19, three parts 51,52,57 of optical fiber 5 can be along connecting portion 2A(boundary zone 8A) overlapping laying.In the embodiment of Figure 19, not specifically created surplus part between the part 51,52 and 57 of optical fiber.
In addition, in the foregoing description of Figure 13, boundary 7A and 7B are arranged on the mid point of connecting portion 2A and 2B.Yet the present invention is not limited to this specific embodiments.For example, boundary 7A and 7B can be arranged on the end points of connecting portion 2A and 2B.In this case, boundary zone 8A can normally be defined as the zone identical with 2B with connecting portion 2A by similar the foregoing description with 8B.In addition, be included in the boundary 7A on the end points of connecting portion 2A and 2B and the zone of 7B both sides, the zone of end that promptly comprises connecting portion and be connected to the unit cable of this connecting portion can be defined as the boundary zone.
In addition, boundary 7A and 7B also can be arranged on and connecting portion 2A and 2B separately independently on the position.In this case, leave the locational of connecting portion 2A and 2B because boundary zone 8A and 8B are arranged on, the embodiment of a fifth aspect of the present invention is inequality with the embodiment of a sixth aspect of the present invention.
The optical fiber laying structure of position detecting system appears in power cable fault according to a fifth aspect of the invention, and two or more parts with different longitudinal directions of same optical fiber are to lay along near the region overlapping the boundary of power cable.Therefore, the temperature peak position, promptly the position occurring such as the fault of earth fault is to be measured by this optical fiber two or more parts in this zone, thus this position can accurately be measured, and thereby can judge easily that in the section of adjacency which be this fault appear on.
The optical fiber laying structure of position detecting system appears in the fault of power cable according to a sixth aspect of the invention, and two or more parts with different longitudinal directions of same optical fiber are along the overlapping laying of connecting portion of the unit cable of power cable.Therefore, the temperature peak position, promptly the position occurring such as the fault of earth fault is to be measured by optical fiber two or more parts on connecting portion, signal occurs and can accurately be measured thereby have fault such as the connecting portion of the high occurrence rate of fault of earth fault.
For person skilled in the art person, other advantage will be ready-made with remodeling.Therefore, the present invention its be not limited to shown here and these specific details and the typical equipments described in the aspect widely.Correspondingly, various remodeling can constitute under the essence that does not break away from the defined total inventive concept of appending claims and clause of equal value thereof is looked situation with scope.
Claims (6)
1, a kind of with the Temperature Detector of laying Raman's backscattering optical fiber profile temperature sensor along a power cable (1) optical fiber (5A to 5D) and a temperature raised position measuring this power cable measure the optical fiber laying structure that a power cable abort situation detection system of position appears in a fault, it is characterized in that:
Described power cable (1) is divided into a plurality of sections (4A to 4D), independently optical fiber is laid on each section along described power cable, and the part of the optical fiber of laying along one of adjacent section is to be laid in overlappingly near each corresponding boundary of these sections along on the part of the optical fiber of another section laying of adjacency.
2, a kind of optical fiber (5A to 5D) and temperature raised position measuring this power cable with the Temperature Detector of laying Raman's backscattering optical fiber profile temperature sensor along a power cable (1) measured the optical fiber laying structure of abort situation detection system that a power cable of position appears in a fault, it is characterized in that:
Described power cable (1) comprises the unit cable (3A to 3D) of many series connection, independently optical fiber is laid along described unit cable, and the part of the optical fiber of laying along one of unit cable of adjacency is to be laid in overlappingly on the connecting portion (2A to 2C) of unit cable along on the part of the optical fiber of another laying of the unit cable of adjacency.
3, a kind of with the Temperature Detector of laying Raman's backscattering optical fiber profile temperature sensor along a power cable (1) optical fiber (5A to 5D) and a temperature raised position measuring this power cable measure the optical fiber laying structure that a power cable abort situation detection system of position appears in a fault, it is characterized in that:
Described power cable (1) is divided into a plurality of sections (4A to 4D), and surplus part (51,52) be formed on optical fiber some (7A is 7B) on the part that near power cable is partly located in the boundary of the section of this power cable at least.
4, a kind of with the Temperature Detector of laying Raman's backscattering optical fiber profile temperature sensor along a power cable (1) optical fiber (5A to 5C) and a temperature raised position measuring this power cable measure the optical fiber laying structure that a power cable abort situation detection system of position appears in a fault, it is characterized in that:
Described power cable (1) comprises the unit cable (3A to 3D) of many series connection, and surplus partly be formed on optical fiber some (2A is 2B) on the part that near power cable is partly located at each connecting portion of unit cable at least.
5, a kind of with the Temperature Detector of laying Raman's backscattering optical fiber profile temperature sensor along a power cable (1) optical fiber (5A to 5D) and a temperature raised position measuring this power cable measure the optical fiber laying structure that a power cable abort situation detection system of position appears in a fault, it is characterized in that:
Described power cable (1) is divided into a plurality of sections (4A to 4D), and same optical fiber two or more different parts (52A, 52B, 52) in the vertical are to lay overlappingly near the boundary of section.
6, a kind of with the Temperature Detector of laying Raman's backscattering optical fiber profile temperature sensor along a power cable (1) optical fiber (5A to 5D) and a temperature raised position measuring this power cable measure the optical fiber laying structure that a power cable abort situation detection system of position appears in a fault, it is characterized in that:
Described power cable (1) comprises the unit cable (3A to 3D) of many series connection, and same optical fiber different two or more parts (52A in the vertical, 52B, 52) be that (2A lays in 2B) overlappingly for connecting portion at the constituent parts cable.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18307890A JP2581607B2 (en) | 1990-07-11 | 1990-07-11 | Optical fiber laying structure for power cable line fault point detection system |
| JP183078/90 | 1990-07-11 | ||
| JP185969/90 | 1990-07-13 | ||
| JP2192444A JPH071296B2 (en) | 1990-07-20 | 1990-07-20 | Optical fiber laying structure for detection in power cable line fault point detection system |
| JP192444/90 | 1990-07-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1058473A CN1058473A (en) | 1992-02-05 |
| CN1025076C true CN1025076C (en) | 1994-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91104453 Expired - Fee Related CN1025076C (en) | 1990-07-11 | 1991-07-11 | Optical fiber laying structure for electric power cable line trouble occurrence location detecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1025076C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100496994B1 (en) * | 2003-04-04 | 2005-06-23 | 엘에스전선 주식회사 | Underground Cable real time determining System and method thereof |
| EP2223053B1 (en) * | 2007-11-29 | 2018-11-07 | Prysmian Cables & Systems Limited | A device for applying a fiber-optic monitoring system to a component to be monitored |
| CN101852657A (en) * | 2010-06-08 | 2010-10-06 | 浙江大学 | Enhanced optical fiber Raman distributed sensing method and sensing equipment |
| CN103048592B (en) * | 2012-12-14 | 2015-07-08 | 广州供电局有限公司 | Method and system for off-line locating power cable fault |
| CN103439780B (en) * | 2013-08-07 | 2015-04-08 | 广州供电局有限公司 | Method and system for reasonably laying optical fibers and power cables |
| CN103439630A (en) * | 2013-08-07 | 2013-12-11 | 广州供电局有限公司 | Power cable fault point positioning method and system |
| CN103543318B (en) * | 2013-10-15 | 2016-04-13 | 华南理工大学 | A kind of defining method of load cycling cable conductor temperature peak value moment |
| CN108257723A (en) * | 2018-01-11 | 2018-07-06 | 乐清市宏牛电气科技有限公司 | Power line lead insulation protecting device with monitoring feedback function |
| CN108693445A (en) * | 2018-05-23 | 2018-10-23 | 广东电网有限责任公司 | Power transmission cable Fault Locating Method and device |
| CN109557424B (en) * | 2018-12-07 | 2020-08-18 | 杭州电子科技大学 | Underground cable local fault detection method |
-
1991
- 1991-07-11 CN CN 91104453 patent/CN1025076C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1058473A (en) | 1992-02-05 |
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Granted publication date: 19940615 Termination date: 20100711 |