CN105301427B - The method for diagnosing faults and device of cable connector - Google Patents

The method for diagnosing faults and device of cable connector Download PDF

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Publication number
CN105301427B
CN105301427B CN201510703894.5A CN201510703894A CN105301427B CN 105301427 B CN105301427 B CN 105301427B CN 201510703894 A CN201510703894 A CN 201510703894A CN 105301427 B CN105301427 B CN 105301427B
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temperature
cable
cable connector
monitoring point
data
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CN105301427A (en
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马彬锐
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Xinjiang Goldwind Science and Technology Co Ltd
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Xinjiang Goldwind Science and Technology Co Ltd
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Abstract

The embodiment provides the method for diagnosing faults and device of a kind of cable connector.The method for diagnosing faults of the cable connector includes:Obtain the first temperature of respective monitoring point and the second temperature of at least two cable connector local environments at least two cable connectors;According to the first temperature and second temperature got, calculate monitoring point at the every cable connector and rise data compared with the temperature of the environment;Data are risen according to the temperature and judge whether the every cable connector breaks down.By the method for diagnosing faults and device of the cable connector of the present invention, it can realize the malfunction monitoring to cable connector, avoid the security risk brought by cable and junction malfunction, at the same it is relatively low to the required precision of temperature sensor, so as to reduce cost.

Description

The method for diagnosing faults and device of cable connector
Technical field
The present invention relates to cable fault monitoring technical field more particularly to the method for diagnosing faults and dress of a kind of cable connector It puts.
Background technology
In large-scale electric power system, more and more using power cable power transmission and distribution.Failure is as caused by power cable Influence the principal element of electric power regular supply.However, cable operation fault mostly occurs in the position of cable connector.It is in general, existing Some cable and junction malfunction diagnostic methods are primarily adapted for use in high-voltage electric power system, are not appropriate for the failure prison of Multi-core cable joint It surveys.
By taking power cable used in wind-powered electricity generation field as an example.Since the height of generator is higher, construction is more difficult, power Cable is generally connected using cable connector mode.Because the construction quality of cable connector is not high, while in the fortune of wind power generating set It also occur that vibration and the abnormal conditions such as fall, cause cable connector to loosen during row, and then there is contact resistance increase etc. Quality problems.The thing followed is that the running temperature of cable connector accordingly raises, and so as to accelerate joint insulation ag(e)ing, makes partial discharge Electric probability increase forms vicious circle, ultimately results in high temperature failure, triggers cable fire.
The power cable is a kind of Multi-core cable joint, and therefore, the failure that existing method is not particularly suited for power cable is examined It is disconnected, it can not also avoid the security risk brought by cable and junction malfunction.In addition, the prior art typically directly utilizes temperature survey knot Fruit is as breakdown judge benchmark, therefore, the accuracy of breakdown judge to be improved, it is necessary to the high temperature measuring equipment of service precision, into And cause fault diagnosis cost higher.
The content of the invention
The purpose of the embodiment of the present invention is, provides the method for diagnosing faults and device of a kind of cable connector, with realization pair The malfunction monitoring of cable connector avoids the security risk brought by cable and junction malfunction, meanwhile, without relying on the essence of temperature measuring equipment Degree, reduces cost.
For achieving the above object, the embodiment provides a kind of method for diagnosing faults of cable connector, institutes The method of stating includes:The first temperature of respective monitoring point and at least two cables at least two cable connectors are obtained to connect The second temperature of head local environment;According to the first temperature and second temperature got, calculate and supervised at the every cable connector Measuring point rises data compared with the temperature of the environment;Data are risen according to the temperature and judge whether the every cable connector occurs event Barrier.
Preferably, the first temperature and second temperature that the basis is got are calculated and monitored at the every cable connector The processing that point rises data compared with the temperature of the environment includes:The first temperature of monitoring point at each cable connector is calculated respectively First difference of degree and the average value of the first temperature of monitoring point at least two cable connectors, and described in calculating at least The average value of first temperature of monitoring point and the second temperature of at least two cable connector local environments at two cable connectors Second difference of degree, using the ratio of first difference and second difference as monitoring point phase at cable connector every described Data are risen for the temperature of the environment.
Preferably, it is described that the processing bag that data judge whether the every cable connector break down is risen according to the temperature It includes:If the temperature of certain root cable connector, which rises data, is more than default temperature liter data threshold, the cable and junction malfunction is judged.
Preferably, the processing for obtaining the first temperature of respective monitoring point at least two cable connectors includes:Pass through Temperature transducer and/or infrared temperature measurement apparatus are acquired, and obtain the first temperature of respective monitoring point at least two cable connectors Degree.
Preferably, alarm is carried out after the cable and junction malfunction is judged.
The embodiment of the present invention additionally provides a kind of trouble-shooter of cable connector, and described device includes:Temperature obtains Modulus block connects for obtaining the first temperature of respective monitoring point and at least two cables at least two cable connectors The second temperature of head local environment;Temperature rises data computation module, for according to the first temperature and second temperature got, calculating Monitoring point rises data compared with the temperature of the environment at the every cable connector;Breakdown judge module, for according to the temperature It rises data and judges whether the every cable connector breaks down.
Preferably, the temperature rises data computation module and includes:Difference computational unit, for calculating each cable respectively First temperature of joint monitoring point and first of the average value of the first temperature of monitoring point at least two cable connectors Difference, and calculate the average value of the first temperature of monitoring point and at least two cables at least two cable connectors Second difference of the second temperature of connector local environment, temperature rise Data Computation Unit, for will first difference and described the The ratio of two differences is as monitoring point rises data compared with the temperature of the environment at cable connector every described.
Preferably, if the breakdown judge module rises data for the temperature of certain root cable connector is more than default temperature liter number According to threshold value, the cable and junction malfunction is judged.
Preferably, the temperature acquisition module includes temperature transducer and/or infrared temperature measurement apparatus.
Preferably, the cable connector is the same phase power cable joint for wind power generating set.
The method for diagnosing faults and device of cable connector provided in an embodiment of the present invention, foundation get multi-cable connector Locate the temperature of respective monitoring point and the temperature of local environment, obtain monitoring point at every cable connector and rise number compared with the temperature of environment According to.Temperature is further risen into data as benchmark is judged, judges whether certain root cable breaks down, it is achieved thereby that cable connector Malfunction monitoring, avoid the security risk brought by cable and junction malfunction.In addition, with the prior art directly using temperature survey Amount result carries out breakdown judge and compares, and the present embodiment is relatively low to temperature sensor required precision, so as to reduce cost, and fits It is wider with face.Other technical fields for meeting multicore cable condition are applied also in addition to wind-powered electricity generation field.
Description of the drawings
Fig. 1 is the flow diagram of the method for diagnosing faults of the cable connector of the embodiment of the present invention one;
Fig. 2 is the structure diagram of the trouble-shooter of the cable connector of the embodiment of the present invention two.
Specific embodiment
The method for diagnosing faults and device of cable connector of the embodiment of the present invention are described in detail below in conjunction with the accompanying drawings.
Embodiment one
Fig. 1 is the flow diagram of the method for diagnosing faults of the cable connector of the embodiment of the present invention one, as shown in Figure 1, electric The method for diagnosing faults of cable joint includes:
Step 101:It obtains the first temperature of respective monitoring point at least two cable connectors and at least two cables connects The second temperature of head local environment.
In practical applications, the position of monitoring point can be determined according to the reliability of live physical condition and equipment, generally Choose position of the insulation sheath as monitoring point at cable connector.Correspondingly, the first temperature can be exhausted at every cable connector The temperature of certain monitoring point on edge crust, can be specifically acquired by temperature transducer and/or infrared temperature measurement apparatus, be obtained at least First temperature of respective monitoring point at two cable connectors.For example, it is pasted on electricity using the temperature transducer of model PT100 Insulation sheath carries out temperature survey at cable joint so that and it is easier to the temperature survey mode at cable connector, it is easily operated. Second temperature is the temperature of external environment residing for insulation sheath at cable connector.
Step 102:According to the first temperature and second temperature got, calculate at every cable connector monitoring point compared with The temperature of environment rises data.
In concrete implementation mode, the first temperature of monitoring point at each cable connector and at least two can be calculated respectively First difference of the average value of the first temperature of monitoring point at cable connector, and calculate monitoring point at least two cable connectors The average value of the first temperature and the second difference of the second temperature of at least two cable connector local environments, by the first difference with The ratio of second difference rises data as monitoring point at every cable connector compared with the temperature of environment.Specifically using following formula (1) It calculates monitoring point at every cable connector and rises data compared with the temperature of environment:
... ... ... ... ... ... ... ... ... ... ... ... formula (1)
Wherein, RiTemperature for i-th cable connector rises data, the root that i is positive integer and 1≤i≤n, n are cable connector Number, TiFor the first temperature of monitoring point at i-th cable connector, TeFor the second temperature of n root cable connector local environments.
It should be noted that foregoing cable connector can be the same phase power cable joint for wind power generating set.Under The technical principle of above-mentioned formula (1) is described in detail by taking the same phase power cable joint of 2.5MW wind power generating sets as an example in face.
Cabin generator is made of with each three-core cable of leader cable between bottom of towe converter cabinet three cables, and unit is just Under normal working condition, the electric current of three cables is almost equal.According to pertinent literature and principle, heat formula (Tx-Te)=PZ =I2RxZ, wherein P are the thermal power at cable connector;Z is to the thermal resistance of monitoring point, R at cable connectorxIt is contacted for cable connector Resistance, TxFor the monitoring point temperature at cable connector, TeFor the temperature of cable connector local environment, I is the electricity for flowing through cable connector Stream.
In the present embodiment, the electric current I that three-core cable flows through is equal.Simultaneously as every cable have identical installation, Using and measuring condition, therefore, the thermal resistance Z at cable connector to monitoring point is also equal, it can be seen that cable connector contact Resistance RxWith temperature gap (Tx-Te) into certain proportionate relationship.Therefore, following formula (2) can be obtained:
R1:R2:R3=(T1-Te):(T2-Te):(T3-Te) ... ... ... ... ... ... formula (2)
Wherein, R1、R2、R3For the contact resistance of the respective cable connector of three-core cable, T1、T2、T3For each of three-core cable The temperature of monitoring point, T from cable connectoreFor the temperature of three-core cable local environment.
From which further follow that following formula (3):
R1:R2:R3=(T1-Te):(T2-Te):(T3-Te)=B1:B2:B3... ... ... formula (3)
Wherein, B1、B2、B3For the temperature ratio of the respective cable connector of three-core cable.
Definition temperature rises dataConvolution (2) and formula (3), further draw following formula (4):
... ... ... ... ... formula (4)
Wherein, the value of i is 1,2,3.As it can be seen that formula (4) can regard the situation of three cables in formula (1) as, therefore, according to formula (4) monitoring point at every cable connector can be calculated respectively rises data compared with the temperature of environment.
Step 103:Data are risen according to temperature and judge whether every cable connector breaks down.
It, specifically, can be to every electricity after obtaining monitoring point at every cable connector and rising data compared with the temperature of environment Cable is all handled as follows:The temperature of certain root cable connector is risen into data compared with default temperature liter data threshold, if certain The temperature of root cable connector, which rises data and is more than default temperature, rises data threshold, and judgement cable and junction malfunction as needed can also be into Row alarm.
In practical applications, default temperature rises data threshold needs and is determined according to on-site actual situations, for example, default temperature It is 20% to rise data threshold, can be also adjusted according to the behaviour in service in later stage.Here, default temperature rise data threshold can be with It is a data area, that is to say, that the fluctuation of each cable temperature.So as to which whether certain the root cable judged in this phase cable is sent out Raw unusual condition, can carry out alarm, engineer to be notified to go to scene for the cable for being determined as cable and junction malfunction Detailed inspection is carried out, avoiding further deteriorating causes cable to trigger even more serious accident due to high temperature fuses in joint.
The method for diagnosing faults of the cable connector of the present invention, according to the temperature for getting the respective monitoring point in multi-cable joint The temperature of degree and local environment obtains monitoring point at every cable connector and rises data compared with the temperature of environment.Further by Wen Sheng Data judge whether certain root cable breaks down, it is achieved thereby that the malfunction monitoring of cable connector, avoid as benchmark is judged The security risk brought by cable and junction malfunction.
In addition, compared with the prior art is directly using temperature measurement result progress breakdown judge, the present embodiment is to temperature Sensor accuracy requirement is relatively low, so as to reduce cost.Also, applicable surface is wider, and other symbols are applied also in addition to wind-powered electricity generation field Close the technical field of multicore cable condition.
Embodiment two
Fig. 2 is the structure diagram of the trouble-shooter of the cable connector of the embodiment of the present invention two.Available for performing sheet The method for diagnosing faults step of the cable connector of inventive embodiments one.
With reference to Fig. 2, the trouble-shooter of the cable connector includes temperature acquisition module 201, temperature liter data computation module 202 and breakdown judge module 203.
Temperature acquisition module 201 is for the first temperature of respective monitoring point at acquisition at least two cable connectors, Yi Jizhi The second temperature of few two cable connector local environments.
Preferably, temperature acquisition module 201 includes temperature transducer and/or infrared temperature measurement apparatus.
Temperature rises data computation module 202 and is used for according to the first temperature and second temperature got, calculates every cable and connects Tou Chu monitoring points rise data compared with the temperature of environment.
Specifically, temperature rises data computation module 202 and can include:
Difference computational unit (not shown), for calculate respectively the first temperature of monitoring point at each cable connector with First difference of the average value of the first temperature of monitoring point at least two cable connectors, and calculate at least two cable connectors Locate the average value of the first temperature of monitoring point and the second difference of the second temperature of at least two cable connector local environments.
Temperature rises Data Computation Unit (not shown), for using the ratio of the first difference and the second difference as every electricity Monitoring point rises data compared with the temperature of environment at cable joint.
Breakdown judge module 203 is used to judge whether every cable connector breaks down according to temperature liter data.
Specifically, if breakdown judge module 203, which can be used for the temperature of certain root cable connector to rise data, is more than default Wen Sheng Data threshold judges the cable and junction malfunction, can also carry out alarm.
Further, cable connector can be the same phase power cable joint for wind power generating set.So as to effectively supervise The fault condition of the same phase power cable joint of wind power generating set is surveyed, suitable for wind-powered electricity generation field.
The trouble-shooter of the cable connector of the present invention, according to the temperature for getting the respective monitoring point in multi-cable joint The temperature of degree and local environment obtains monitoring point at every cable connector and rises data compared with the temperature of environment.Finally according to Wen Sheng Data go to judge whether certain root cable breaks down, it is achieved thereby that the malfunction monitoring of cable connector, avoid because cable connects The security risk that head failure is brought.Meanwhile the precision without relying on temperature measuring equipment, reduce cost.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in change or replacement, should all contain Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims (8)

1. a kind of method for diagnosing faults of cable connector, which is characterized in that the described method includes:
Obtain the first temperature of respective monitoring point and the ring at least residing for two cable connectors at least two cable connectors The second temperature in border;
According to the first temperature and second temperature got, monitoring point is calculated at the every cable connector compared with the environment Temperature rise data;
Data are risen according to the temperature and judge whether the every cable connector breaks down;
The first temperature and second temperature that the basis is got, calculate the every cable connector at monitoring point compared with described The processing that the temperature of environment rises data includes:
The first temperature of monitoring point and monitoring point at least two cable connectors at each cable connector are calculated respectively The first temperature average value the first difference, and the first temperature of monitoring point at least two cable connectors described in calculating Average value and the second difference of the second temperature of at least two cable connector local environments,
Using the ratio of first difference and second difference as every described at cable connector monitoring point compared with described The temperature of environment rises data.
2. according to the method described in claim 1, it is characterized in that, described judge the every cable according to temperature liter data The processing whether connector breaks down includes:
If the temperature of certain root cable connector, which rises data, is more than default temperature liter data threshold, the cable and junction malfunction is judged.
3. according to method according to any one of claims 1 to 2, which is characterized in that acquisition at least two cable connectors Locating the processing of the first temperature of respective monitoring point includes:
It is acquired by temperature transducer and/or infrared temperature measurement apparatus, obtains respective monitoring point at least two cable connectors The first temperature.
4. it according to the method described in claim 2, is carried it is characterized in that, carrying out alarm after the cable and junction malfunction is judged Show.
5. a kind of trouble-shooter of cable connector, which is characterized in that described device includes:
Temperature acquisition module, for obtain at least two cable connectors at respective monitoring point the first temperature and it is described at least The second temperature of two cable connector local environments;
Temperature rises data computation module, for according to the first temperature and second temperature got, calculating the every cable connector Locate monitoring point and rise data compared with the temperature of the environment;
Breakdown judge module judges whether the every cable connector breaks down for rising data according to the temperature;
The temperature, which rises data computation module, to be included:
Difference computational unit, for calculating at each cable connector the first temperature of monitoring point and described at least two respectively First difference of the average value of the first temperature of monitoring point at cable connector, and supervised described in calculating at least two cable connectors The average value of first temperature of measuring point and the second difference of the second temperature of at least two cable connector local environments,
Temperature rises Data Computation Unit, for the ratio of first difference and second difference to be connect as cable every described Tou Chu monitoring points rise data compared with the temperature of the environment.
6. device according to claim 5, which is characterized in that if the breakdown judge module is used for certain root cable connector Temperature rise data be more than default temperature liter data threshold, judge the cable and junction malfunction.
7. the device according to any one of claim 5~6, which is characterized in that the temperature acquisition module includes thermometric Sensor and/or infrared temperature measurement apparatus.
8. device according to claim 7, which is characterized in that the cable connector is the same phase for wind power generating set Power cable joint.
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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
CN109239543B (en) * 2018-08-22 2020-05-29 云南电网有限责任公司电力科学研究院 Method for simulating and testing faults of ethylene propylene rubber cable terminal
CN109596224A (en) * 2018-12-24 2019-04-09 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
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
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