CN105301427A - Fault diagnosis method of cable joint and fault diagnosis device of cable joint - Google Patents
Fault diagnosis method of cable joint and fault diagnosis device of cable joint Download PDFInfo
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- CN105301427A CN105301427A CN201510703894.5A CN201510703894A CN105301427A CN 105301427 A CN105301427 A CN 105301427A CN 201510703894 A CN201510703894 A CN 201510703894A CN 105301427 A CN105301427 A CN 105301427A
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- temperature
- cable
- cable splice
- monitoring point
- rise data
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Abstract
The embodiment of the present invention provides a fault diagnosis method of a cable joint and a fault diagnosis device of a cable joint. The fault diagnosis method of the cable joint comprises: obtaining a first temperature of each monitoring point at the joints of at least two cables and a second temperature of an environment at the joints of the at least two cables; calculating temperature rise data of each monitoring point at the joints of the cables with respect to the environment according to the obtained first temperature and second temperature; and determining whether the cable joints have faults or not according to the temperature rise data. According to the fault diagnosis method of the cable joint and the fault diagnosis device of the cable joint, fault monitoring of the cable joint may be realized, potential risk caused by the faults of the cable joint may be avoided, and the precision requirement of a temperature sensor is low so that the cost is reduced.
Description
Technical field
The present invention relates to cable fault monitoring technical field, particularly relate to a kind of method for diagnosing faults and device of cable splice.
Background technology
In large-scale electric power system, adopt power cable power transmission and distribution more and more.The fault caused by power cable is the principal element affecting electric power regular supply.But cable operation fault occurs in the position of cable splice mostly.Usually, existing cable and junction malfunction diagnostic method is mainly applicable to high-voltage electric power system, and is not suitable for the malfunction monitoring of Multi-core cable joint.
For the power cable that wind-powered electricity generation field uses.Because the height of generator is higher, construction is difficulty comparatively, and power cable generally adopts cable splice mode to connect.Because the construction quality of cable splice is not high, in the operational process of wind power generating set, also can there are vibrate and fall etc. abnormal conditions simultaneously, cause cable splice to loosen, and then occur the quality problems such as contact resistance increase.The thing followed is the corresponding rising of running temperature of cable splice, thus accelerates joint insulation ag(e)ing, innings discharge probability is increased and forms vicious cycle, finally cause high temperature fault, cause cable fire.
This power cable is a kind of Multi-core cable joint, and therefore, existing method is not also suitable for the fault diagnosis of power cable, cannot avoid the potential safety hazard because cable and junction malfunction brings yet.In addition, prior art directly utilizes temperature measurement result as breakdown judge benchmark usually, therefore, for improving the accuracy of breakdown judge, just needs the temperature measuring equipment that service precision is high, and then causing trouble diagnosis cost is higher.
Summary of the invention
The object of the embodiment of the present invention is, provides a kind of method for diagnosing faults and device of cable splice, to realize the malfunction monitoring to cable splice, avoiding the potential safety hazard because cable and junction malfunction brings, without the need to relying on the precision of temperature measuring equipment, reducing costs meanwhile.
For achieving the above object, The embodiment provides a kind of method for diagnosing faults of cable splice, described method comprises: the first temperature obtaining monitoring point separately, at least two cable splice places, and the second temperature of environment residing for described at least two cable splices; According to the first temperature got and the second temperature, calculate monitoring point, cable splice place described in every root relative to the temperature rise data of described environment; Judge described in every root, whether cable splice breaks down according to described temperature rise data.
Preferably, the first temperature that described basis gets and the second temperature, calculate monitoring point, cable splice place described in every root to comprise relative to the process of the temperature rise data of described environment: the first difference calculating the mean value of the first temperature of monitoring point, each described cable splice place and the first temperature of monitoring point, described at least two cable splice places respectively, and the second difference of the second temperature of environment residing for the mean value of the first temperature of monitoring point, at least two cable splice places described in calculating and described at least two cable splices, using the ratio of described first difference and described second difference as monitoring point, cable splice place described in every root relative to the temperature rise data of described environment.
Preferably, describedly judge that the process that described in every root, whether cable splice breaks down comprises according to described temperature rise data: if the temperature rise data of certain root cable splice are greater than default temperature rise data threshold, judge described cable and junction malfunction.
Preferably, the process of described acquisition at least two cable splice places the first temperature of monitoring point separately comprises: gathered by temperature probe and/or infrared temperature measurement apparatus, obtains the first temperature of monitoring point separately, at least two cable splice places.
Preferably, after the described cable and junction malfunction of judgement, alarm is carried out.
Embodiments of the invention additionally provide a kind of trouble-shooter of cable splice, described device comprises: temperature acquisition module, for obtaining the first temperature of monitoring point separately, at least two cable splice places, and the second temperature of environment residing for described at least two cable splices; Temperature rise data computation module, for according to the first temperature got and the second temperature, calculates monitoring point, cable splice place described in every root relative to the temperature rise data of described environment; According to described temperature rise data, breakdown judge module, for judging described in every root, whether cable splice breaks down.
Preferably, described temperature rise data computation module comprises: difference computational unit, for the first difference of the mean value of the first temperature of the first temperature and monitoring point, described at least two cable splice places that calculate monitoring point, each described cable splice place respectively, and the second difference of the second temperature of environment residing for the mean value of the first temperature of monitoring point, at least two cable splice places described in calculating and described at least two cable splices, temperature rise Data Computation Unit, for using the ratio of described first difference and described second difference as monitoring point, cable splice place described in every root relative to the temperature rise data of described environment.
Preferably, if the temperature rise data that described breakdown judge module is used for certain root cable splice are greater than default temperature rise data threshold, described cable and junction malfunction is judged.
Preferably, described temperature acquisition module comprises temperature probe and/or infrared temperature measurement apparatus.
Preferably, described cable splice is the homophase power cable joint for wind power generating set.
The method for diagnosing faults of the cable splice that the embodiment of the present invention provides and device, according to getting the multi-cable joint temperature of monitoring point and the temperature of residing environment separately, obtain the temperature rise data of monitoring point, every root cable splice place relative to environment.Further using temperature rise data as judgment standard, judge whether certain root cable breaks down, thus achieve the malfunction monitoring to cable splice, avoid the potential safety hazard because cable and junction malfunction brings.In addition, carry out compared with breakdown judge with the temperature measurement result that directly utilizes of prior art, the present embodiment is lower to temperature sensor accuracy requirement, thus reduces cost, and applicable surface is wider.Other technical field meeting polycore cable condition is also applicable to except wind-powered electricity generation field.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method for diagnosing faults of the cable splice of the embodiment of the present invention one;
Fig. 2 is the structural representation of the trouble-shooter of the cable splice of the embodiment of the present invention two.
Embodiment
Below in conjunction with accompanying drawing, the method for diagnosing faults of embodiment of the present invention cable splice and device are described in detail.
Embodiment one
Fig. 1 is the schematic flow sheet of the method for diagnosing faults of the cable splice of the embodiment of the present invention one, and as shown in Figure 1, the method for diagnosing faults of cable splice comprises:
Step 101: the first temperature obtaining monitoring point separately, at least two cable splice places, and the second temperature of environment residing at least two cable splices.
In actual applications, the position of monitoring point can be determined according to the reliability of on-the-spot physical condition and equipment, generally chooses the position of cable splice place insulation sheath as monitoring point.Correspondingly, the first temperature can be the temperature of certain monitoring point on every root cable splice place insulation sheath, specifically gathers by temperature probe and/or infrared temperature measurement apparatus, obtains the first temperature of monitoring point separately, at least two cable splice places.For example, use the temperature probe of model PT100 to stick and carry out temperature survey in cable splice place insulation sheath, make the temperature survey mode at cable splice place easier, be easy to operation.Second temperature is the temperature of external environment residing for cable splice place insulation sheath.
Step 102: according to the first temperature got and the second temperature, calculates the temperature rise data of monitoring point, every root cable splice place relative to environment.
In concrete implementation, the first difference of the mean value of the first temperature of monitoring point, each cable splice place and the first temperature of monitoring point, at least two cable splice places can be calculated respectively, and the second difference of the mean value calculating the first temperature of monitoring point, at least two cable splice places and the second temperature of environment residing at least two cable splices, using the temperature rise data of ratio as monitoring point, every root cable splice place relative to environment of the first difference and the second difference.Following formula (1) specifically can be utilized to calculate the temperature rise data of monitoring point, every root cable splice place relative to environment:
Wherein, R
ibe the temperature rise data of i-th cable splice, i is positive integer and 1≤i≤n, n is the radical of cable splice, T
ibe the first temperature of monitoring point, i-th cable splice place, T
ethe second temperature of environment residing for n root cable splice.
It should be noted that, aforementioned cable splice can be the homophase power cable joint for wind power generating set.Below for the homophase power cable joint of 2.5MW wind power generating set, describe the know-why of above-mentioned formula (1) in detail.
Cabin generator is made up of three cables with each triple cable of the leader cable at the bottom of tower between converter cabinet, and in normal operation, the electric current of three cables is almost equal for unit.According to pertinent literature and principle, heat formula (T
x-T
e)=PZ=I
2r
xz, wherein P is the thermal power at cable splice place; Z is the thermal resistance of cable splice place to monitoring point, R
xfor cable splice contact resistance, T
xfor the monitoring point temperature at cable splice place, T
ethe temperature of environment residing for cable splice, I is the electric current flowing through cable splice.
In the present embodiment, the electric current I that flows through of triple cable is equal.Meanwhile, because every root cable has identical installation, use and measuring condition, therefore, the thermal resistance Z of cable splice place to monitoring point is also equal, this shows cable splice contact resistance R
xwith temperature gap (T
x-T
e) become certain proportionate relationship.Therefore, following formula (2) can be obtained:
R
1: R
2: R
3=(T
1-T
e): (T
2-T
e): (T
3-T
e) ... formula (2)
Wherein, R
1, R
2, R
3for the contact resistance of the respective cable splice of triple cable, T
1, T
2, T
3for the temperature of the monitoring point, respective cable splice place of triple cable, T
ethe temperature of environment residing for triple cable.
Draw following formula (3) further:
R
1: R
2: R
3=(T
1-T
e): (T
2-T
e): (T
3-T
e)=B
1: B
2: B
3formula (3)
Wherein, B
1, B
2, B
3for the temperature ratio of the respective cable splice of triple cable.
Definition temperature rise data are
convolution (2) and formula (3), further draw following formula (4):
Wherein, the value of i is 1,2,3.Visible, formula (4) can regard the situation of three cables in formula (1) as, therefore, can calculate the temperature rise data of monitoring point, every root cable splice place relative to environment respectively according to formula (4).
Step 103: judge whether every root cable splice breaks down according to temperature rise data.
After obtaining the temperature rise data of monitoring point, every root cable splice place relative to environment, particularly, all can be handled as follows every root cable: the temperature rise data of certain root cable splice and the temperature rise data threshold preset are compared, if the temperature rise data of certain root cable splice are greater than default temperature rise data threshold, judge cable and junction malfunction, can also alarm be carried out as required.
In actual applications, the temperature rise data threshold preset needs to determine according to on-site actual situations, and such as, the temperature rise data threshold preset is 20%, also can adjust according to the behaviour in service in later stage.Here, the temperature rise data threshold preset can also be a data area, that is fluctuation of each cable temperature.Thus judge whether certain the root cable in this phase cable unusual condition occurs, for being judged to be that the cable of cable and junction malfunction can carry out alarm, to notify that slip-stick artist goes to scene to carry out detailed inspection, deterioration is further avoided to cause cable fuse at joint Yin Gaowen and cause even more serious accident.
The method for diagnosing faults of cable splice of the present invention, according to getting the multi-cable joint temperature of monitoring point and the temperature of residing environment separately, obtains the temperature rise data of monitoring point, every root cable splice place relative to environment.Further using temperature rise data as judgment standard, judge whether certain root cable breaks down, thus achieve the malfunction monitoring to cable splice, avoid the potential safety hazard because cable and junction malfunction brings.
In addition, carry out compared with breakdown judge with the temperature measurement result that directly utilizes of prior art, the present embodiment is lower to temperature sensor accuracy requirement, thus reduces cost.Further, applicable surface is comparatively wide, is also applicable to other technical field meeting polycore cable condition except wind-powered electricity generation field.
Embodiment two
Fig. 2 is the structural representation of the trouble-shooter of the cable splice of the embodiment of the present invention two.Can be used for the method for diagnosing faults step of the cable splice performing the embodiment of the present invention one.
With reference to Fig. 2, the trouble-shooter of this cable splice comprises temperature acquisition module 201, temperature rise data computation module 202 and breakdown judge module 203.
Temperature acquisition module 201 is for obtaining the first temperature of monitoring point separately, at least two cable splice places, and the second temperature of environment residing at least two cable splices.
Preferably, temperature acquisition module 201 comprises temperature probe and/or infrared temperature measurement apparatus.
Temperature rise data computation module 202, for according to the first temperature got and the second temperature, calculates the temperature rise data of monitoring point, every root cable splice place relative to environment.
Particularly, temperature rise data computation module 202 can comprise:
Difference computational unit (not shown), for the first difference of the mean value of the first temperature of the first temperature Yu monitoring point, at least two cable splice places that calculate monitoring point, each cable splice place respectively, and calculate the mean value of the first temperature of monitoring point, at least two cable splice places and the second difference of the second temperature of environment residing at least two cable splices.
Temperature rise Data Computation Unit (not shown), for using the temperature rise data of the ratio of the first difference and the second difference as monitoring point, every root cable splice place relative to environment.
Breakdown judge module 203 is for judging according to temperature rise data whether every root cable splice breaks down.
Particularly, if the temperature rise data that breakdown judge module 203 can be used for certain root cable splice are greater than default temperature rise data threshold, judge this cable and junction malfunction, can also alarm be carried out.
Further, cable splice can be the homophase power cable joint for wind power generating set.Thus effectively monitor the failure condition of the homophase power cable joint of wind power generating set, be applicable to wind-powered electricity generation field.
The trouble-shooter of cable splice of the present invention, according to getting the multi-cable joint temperature of monitoring point and the temperature of residing environment separately, obtains the temperature rise data of monitoring point, every root cable splice place relative to environment.Finally go to judge whether certain root cable breaks down according to temperature rise data, thus achieve the malfunction monitoring to cable splice, avoid the potential safety hazard because cable and junction malfunction brings.Meanwhile, without the need to relying on the precision of temperature measuring equipment, cost is reduced.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. a method for diagnosing faults for cable splice, is characterized in that, described method comprises:
Obtain the first temperature of monitoring point separately, at least two cable splice places, and the second temperature of environment residing for described at least two cable splices;
According to the first temperature got and the second temperature, calculate monitoring point, cable splice place described in every root relative to the temperature rise data of described environment;
Judge described in every root, whether cable splice breaks down according to described temperature rise data.
2. method according to claim 1, is characterized in that, the first temperature that described basis gets and the second temperature, calculates monitoring point, cable splice place described in every root and comprises relative to the process of the temperature rise data of described environment:
Calculate the first difference of the mean value of the first temperature of monitoring point, each described cable splice place and the first temperature of monitoring point, described at least two cable splice places respectively, and the second difference of the second temperature of environment residing for the mean value of the first temperature of monitoring point, at least two cable splice places described in calculating and described at least two cable splices
Using the ratio of described first difference and described second difference as monitoring point, cable splice place described in every root relative to the temperature rise data of described environment.
3. method according to claim 2, is characterized in that, describedly judges that the process that described in every root, whether cable splice breaks down comprises according to described temperature rise data:
If the temperature rise data of certain root cable splice are greater than default temperature rise data threshold, judge described cable and junction malfunction.
4. the method according to any one of claims 1 to 3, is characterized in that, the process of described acquisition at least two cable splice places the first temperature of monitoring point separately comprises:
Gathered by temperature probe and/or infrared temperature measurement apparatus, obtain the first temperature of monitoring point separately, at least two cable splice places.
5. method according to claim 3, is characterized in that, after the described cable and junction malfunction of judgement, carry out alarm.
6. a trouble-shooter for cable splice, is characterized in that, described device comprises:
Temperature acquisition module, for obtaining the first temperature of monitoring point separately, at least two cable splice places, and the second temperature of environment residing for described at least two cable splices;
Temperature rise data computation module, for according to the first temperature got and the second temperature, calculates monitoring point, cable splice place described in every root relative to the temperature rise data of described environment;
According to described temperature rise data, breakdown judge module, for judging described in every root, whether cable splice breaks down.
7. device according to claim 6, is characterized in that, described temperature rise data computation module comprises:
Difference computational unit, for the first difference of the mean value of the first temperature of the first temperature and monitoring point, described at least two cable splice places that calculate monitoring point, each described cable splice place respectively, and the second difference of the second temperature of environment residing for the mean value of the first temperature of monitoring point, at least two cable splice places described in calculating and described at least two cable splices
Temperature rise Data Computation Unit, for using the ratio of described first difference and described second difference as monitoring point, cable splice place described in every root relative to the temperature rise data of described environment.
8. device according to claim 7, is characterized in that, if the temperature rise data that described breakdown judge module is used for certain root cable splice are greater than default temperature rise data threshold, judges described cable and junction malfunction.
9. the device according to any one of claim 6 ~ 8, is characterized in that, described temperature acquisition module comprises temperature probe and/or infrared temperature measurement apparatus.
10. device according to claim 9, is characterized in that, described cable splice is the homophase power cable joint for wind power generating set.
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| CN106443324A (en) * | 2016-08-31 | 2017-02-22 | 国网山东省电力公司菏泽供电公司 | Method for monitoring state of power distribution network |
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| CN106997013A (en) * | 2017-05-16 | 2017-08-01 | 中车洛阳机车有限公司 | A kind of temperature rise experimental method of cable crimping point and crimping armor clamp |
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| CN106814070B (en) * | 2016-12-12 | 2019-11-19 | 国网山东省电力公司电力科学研究院 | A kind of aluminium hydraulic pressed connecting pipe defect dipoles method and system based on infrared measurement of temperature |
| CN106997013A (en) * | 2017-05-16 | 2017-08-01 | 中车洛阳机车有限公司 | A kind of temperature rise experimental method of cable crimping point and crimping armor clamp |
| CN109239543A (en) * | 2018-08-22 | 2019-01-18 | 西南交通大学 | A kind of EP rubbers cable termination failure simulation method |
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| CN109580005A (en) * | 2018-12-24 | 2019-04-05 | 国网山西省电力公司检修分公司 | A kind of failure analysis methods, device, equipment and the storage medium of wire-connection point |
| CN109932593A (en) * | 2019-03-15 | 2019-06-25 | 西门子电力自动化有限公司 | The method and apparatus of fault detection for power equipment |
| CN109932593B (en) * | 2019-03-15 | 2021-08-10 | 西门子电力自动化有限公司 | Method and apparatus for fault detection of electrical equipment |
| CN110855350A (en) * | 2019-11-15 | 2020-02-28 | 索尔思光电（成都）有限公司 | Optical module detection method based on temperature matrix |
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