CN104991149A - Single core power cable online state monitoring device and method - Google Patents
Single core power cable online state monitoring device and method Download PDFInfo
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- CN104991149A CN104991149A CN201510478526.5A CN201510478526A CN104991149A CN 104991149 A CN104991149 A CN 104991149A CN 201510478526 A CN201510478526 A CN 201510478526A CN 104991149 A CN104991149 A CN 104991149A
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Abstract
The invention discloses a single core power cable online state monitoring device and a method. The single core power cable online state monitoring device comprises a cable connector and a measurement assembly arranged on the cable connector. The cable connector comprises a cable core, a main insulation layer which is arranged by surrounding the power cable core, and a metal sheath layer and an outer sheath layer which are adhered and successively arranged on the insulation layer; the measurement assembly comprises a high frequency current sensor and a power frequency current sensor which are clamped on a crossed interconnection wire which is connected to the power cable connector; besides, the measurement assembly also comprises a temperature sensor and a vibration sensor which are installed on the outer sheath layer; the high frequency current sensor, the power frequency current sensor, the temperature sensor and the vibration sensor are connected to a comprehensive monitoring unit through a signal transmission line; and data are transmitted to a data server through an optical fiber after digitalization processing. The invention carries out the deep analysis for the mutual interaction and mutual verification of all measurement components which jointly supports a comprehensive analysis evaluation platform of the cable.
Description
Technical field
The invention belongs to the technical field of measurement and test of power equipment, be specifically related to a kind of single-core power cables on-line condition monitoring device and method.
Background technology
Paper both at home and abroad in power equipment monitoring and patent many, partial discharge monitoring, sheath ground current is monitored, temperature monitoring and vibration monitoring, and each parameter has respective effect, represent a kind of cable operation conditions, cable local discharge is the state of insulation of reflection cable major insulation, if having shelf depreciation to survey may be major insulation generation cracking, causes generation and the development of shelf depreciation, utilize partial discharge monitoring system, then can Timeliness coverage fault omen; Cable cover(ing) ground current is monitored, be then the state reflecting cable jacket (external insulation), detect because the infringement of external insulation or the infringement of sheath protector cause multipoint earthing, causes ground current to become large; Temperature of cable junction is monitored, and is the heat condition of monitoring cable shank; Cable splice vibration monitoring is then test because the loosening cable self vibration that causes of cable folder or fixture increases.
Each monitoring parameter has more patent and article, also the mode that two kinds or three kinds of modes combine is had, each monitoring variable represents a part for cable running status, or in a certain respect, but totally seeming, is all unilateral, if the running status of comprehensive monitoring power cable can be reached, also need all monitoring variables to put together, add certain data analysing method and carry out total evaluation.
Retrieval finds, " method for monitoring partial discharge of power cable connector on line " patent No.: only propose in 200910023925 literary compositions to adopt partial discharge monitoring to judge cable insulation state.Retrieve discovery again, " a kind of cable insulation on-line monitoring system " application number: 201410150637.9 applyings date: 2014-04-15, also just monitor partial discharge monitoring system." a kind of cable head temperature on-Line Monitor Device " application number: 201110104855.5 applyings date: 2011-04-20 content is also the temperature of monitoring cable joint; " a kind of high-tension cable comprehensive monitor system and monitoring method " application number: 201410422693.3 applyings date: 2014-08-25 content is also monitoring cable temperature and ground current; In sum, each patent only has one or two kinds of monitoring variables so that cable running status to be described, can not comprehensive assessment cable running status.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of single-core power cables on-line condition monitoring device and method, cable local discharge amount, cable cover(ing) ground current amount, temperature of cable junction amount and cable splice shock momentum four parameters are comprehensively unified on a platform and show, according to the situation of four parameters, the running status of synthetic determination cable, the generation of prevention cable fault.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of single-core power cables on-line condition monitoring device, comprising:
One cable splice, described cable splice comprises a cable fibre core, one be surrounded on cable fibre core arrange main insulating layer, one is close to metal sheath layer and external sheath layer that main insulating layer arranges in turn;
One is arranged at the measurement components on cable splice, described measurement components comprises the High Frequency Current Sensor of a cramp joint on cross-connect line and power current sensor, described cross-connect line connects described cable splice, also comprises one and is arranged on temperature sensor on external sheath layer and shock sensor;
Described High Frequency Current Sensor, power current sensor, temperature sensor and shock sensor, by signal transmssion line access comprehensive monitoring unit, after digitized processing, are passed in data server by optical fiber cable.
In a preferred embodiment of the invention, described High Frequency Current Sensor is used for local discharge signal to be coupled out, power current sensor is used for by the signal coupling of ground current out, temperature sensor is used for by the temperature survey of joint surface out, and shock sensor is used for the vibration amplitude of self of joint to test out.
A kind of single-core power cables on-line condition monitoring method, comprises the following steps:
Step one, temperature by temperature sensor Real-Time Monitoring joint surface, if temperature is normal, then starting shock amplitude successively, the DATA REASONING of sheath ground current and shelf depreciation, if all normal, then enters circle collection analysis state; If temperature anomaly, then jump to step 2, step 3 and step 4 successively;
Step 2, vibration amplitude by shock sensor downhole joint self;
Step 3, signal by power current sensor measurement sheath ground current;
Step 4, by High Frequency Current Sensor also measure local discharge signal;
Step 5, according to above-mentioned vibration amplitude, sheath ground current and Partial Discharge Data carry out the fault analyzing to navigate to which joint.
In a preferred embodiment of the invention, if vibrations are normal, then judge successively sheath ground current and shelf depreciation whether normal, if be all normal, then explanation is that the change of ambient temperature causes cable surface temperature to rise.
In a preferred embodiment of the invention, if vibrations are abnormal, then measure sheath ground current and Partial Discharge Data according to step 3 and step 4, if sheath ground current and local discharge parameters normal, be then judged as that the folder of cable self and fixture loosen and cause temperature to rise.
In a preferred embodiment of the invention, if cable cover(ing) ground current becomes greatly, vibrations and locally discharge parameters are normal, be then judged as that the temperature that cable jacket breakage, cable heavy overload or sheath protector earth fault cause raises;
In a preferred embodiment of the invention, if shelf depreciation is excessive, vibrations and sheath ground current normally, are then because the existence insulation cracking of cable major insulation causes temperature to rise;
In a preferred embodiment of the invention, if ground current and shelf depreciation all become large, be then that the temperature that comprehensive dual reason causes rises.
In a preferred embodiment of the invention, the parameter of described temperature is small data quantity, and Refresh Data rate is 0.5 second.
In a preferred embodiment of the invention, described vibrations abnormality judgment method is, when normal 110kV cable runs, the amplitude of oscillation of vibrations is generally less than 100 μm, shakes the amplitude of oscillation and be greater than 100 μm of existence extremely when running under nominal load;
Sheath ground current value requires to be not more than 10% of load, is considered as exception more than 10%; The specified temperature being responsible for lower fibre core of cable is no more than 90 °, if more than 90 °, is considered as exception.
By technique scheme, the invention has the beneficial effects as follows:
The present invention is integrated in a platform various parameter, synthesis display, assessment cable status; The integrated parameter of native system is not the independence display of simple machinery, but carries out comprehensive data analysis, and namely each monitoring variable is interacted, mutually verify, mutual relationship is analysed in depth, and common support plays the comprehensive analysis Evaluation Platform of cable.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is structural representation of the present invention.
Fig. 2 is fundamental diagram of the present invention.
Numeral and the corresponding component title represented by letter in figure:
1-data server; 2-optical fiber cable; 3-comprehensive monitoring unit; 4 signal transmssion lines; 5-High Frequency Current Sensor; 6-power current sensor; 7-cross-connect line; 8-cable fibre core; 9-main insulating layer; 10-metal sheath layer; 11-external sheath layer; 12-temperature sensor; 13-shock sensor.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
With reference to Fig. 1, a kind of single-core power cables on-line condition monitoring device, comprising: a cable splice, described cable splice comprises a cable fibre core 8, one main insulating layer 9, being surrounded on cable fibre core 8 setting is close to metal sheath layer 10 and external sheath layer 11 that main insulating layer arranges in turn;
One is arranged at the measurement components on cable splice, described measurement components comprises the High Frequency Current Sensor of a cramp joint on cross-connect line 7 and power current sensor, described cross-connect line connects described cable splice, also comprises one and is arranged on temperature sensor on external sheath layer and shock sensor; Wherein cross-connect line can also be cable grounding line.
Further, High Frequency Current Sensor 5, power current sensor 6, temperature sensor 12 and shock sensor 13 access in comprehensive monitoring unit 3 by signal transmssion line 4, after digitized processing, are passed in data server 1 by optical fiber cable 2.(all detections of the present invention are just monitored the joint of cable, because there are several joints in cable, what have has tens joints, and this said localization of fault refers to the fault navigating to which joint in further quantitative analysis on data server.) sum up the running status of tested cable splice, if any abnormal cable splice then Realtime Alerts, the timely interruption maintenance of the personnel that maintain easily.
Wherein, High Frequency Current Sensor is used for local discharge signal to be coupled out, power current sensor is used for by the signal coupling of ground current out, and temperature sensor is used for by the temperature survey of joint surface out, and shock sensor is used for the vibration amplitude of self of joint to test out.
A kind of single-core power cables on-line condition monitoring method, comprises the following steps:
Step one, temperature by temperature sensor Real-Time Monitoring joint surface, if temperature is normal, then starting shock amplitude successively, the DATA REASONING of sheath ground current and shelf depreciation, if all normal, then enters circle collection analysis state; If temperature anomaly, then jump to step 2, step 3 and step 4 successively;
Step 2, vibration amplitude by shock sensor downhole joint self;
Step 3, signal by power current sensor measurement sheath ground current;
Step 4, by High Frequency Current Sensor also measure local discharge signal;
Step 5, according to above-mentioned vibration amplitude, sheath ground current and Partial Discharge Data carry out the fault analyzing to navigate to which joint.
Its data analysis process as shown in Figure 2, temperature parameters is small data quantity, Real-Time Monitoring can be accomplished, Refresh Data rate is 0.5 second, then first judge that whether temperature is normal, if temperature is normal, then start the measurement of other three amounts successively, if all normal, then enter circle collection analysis state, judge that whether four parameters are abnormal.
Specific targets: shaking abnormality judgment method is that the amplitude of oscillation of vibrations is generally less than 100 μm when normal 110kV cable runs, shake the amplitude of oscillation and are greater than 100 μm of existence extremely when running under nominal load;
Cable cover(ing) ground current value requires to be not more than 10% of load, is considered as exception more than 10%; The specified temperature being responsible for lower fibre core of cable is no more than 90 °, if more than 90 °, is considered as exception;
Online partial discharge quantity judges also not judge abnormal index at present, can dispatch from the factory under shelf depreciation experimental standard 1.5 rated voltage be less than 5pC, if be greater than 5pC to be considered as exception with reference to 110kV twisted polyethylene cable.
Below the step and method of specific implementation:
When temperature becomes large, then judge that whether vibrations are normal, if vibrations are normal, then whether normally judge sheath ground current and shelf depreciation successively, if be all normal, then explanation is that the change of ambient temperature causes cable surface temperature to rise; If vibrations are abnormal, sheath ground current and local discharge parameters normal, be then judged as that the folder of cable self and fixture loosen and cause temperature to rise;
If cable cover(ing) ground current becomes greatly, vibrations and locally discharge parameters are normal, be then judged as that the temperature that cable jacket breakage, cable heavy overload or sheath protector earth fault cause raises; If shelf depreciation is excessive, vibrations and sheath ground current normally, are then because the existence insulation cracking of cable major insulation causes temperature to rise; If ground current and shelf depreciation all become large, be then that the temperature that comprehensive dual reason causes rises.
The present invention remains zero after can also becoming suddenly greatly by the temperature of certain cable splice and vibrations for a long time, and cable cover(ing) ground current vanishing simultaneously also keeps.The generation breakdown fault of the tested joint of this cable can be judged as, and point out some cable splice positions of puncturing, the fault of quick position specifically which joint can be reached, insulation breakdown the most common causes power failure, generally all sharply rise along with temperature, after shock momentum becomes suddenly greatly, vanishing, can carry out quick position to trouble spot by this feature, guided maintenance personnel, find trouble spot rapidly, keep in repair, when circuit is longer, just eliminate the time that every section of cable is checked one by one, for salvaging cable circuit saves the plenty of time.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (10)
1. a single-core power cables on-line condition monitoring device, is characterized in that, comprising:
One cable splice, described cable splice comprises a cable fibre core, one be surrounded on cable fibre core arrange main insulating layer, one is close to metal sheath layer and external sheath layer that main insulating layer arranges in turn;
One is arranged at the measurement components on cable splice, described measurement components comprises the High Frequency Current Sensor of a cramp joint on cross-connect line and power current sensor, described cross-connect line connects described cable splice, also comprises one and is arranged on temperature sensor on external sheath layer and shock sensor;
Described High Frequency Current Sensor, power current sensor, temperature sensor and shock sensor, by signal transmssion line access comprehensive monitoring unit, after digitized processing, are passed in data server by optical fiber cable.
2. a kind of single-core power cables on-line condition monitoring device according to claim 1, it is characterized in that, described High Frequency Current Sensor is used for local discharge signal to be coupled out, power current sensor is used for by the signal coupling of ground current out, temperature sensor is used for by the temperature survey of joint surface out, and shock sensor is used for the vibration amplitude of self of joint to test out.
3. a single-core power cables on-line condition monitoring method, is characterized in that, comprises the following steps:
Step one, temperature by temperature sensor Real-Time Monitoring joint surface, if temperature is normal, then starting shock amplitude successively, the DATA REASONING of sheath ground current and shelf depreciation, if all normal, then enters circle collection analysis state; If temperature anomaly, then jump to step 2, step 3 and step 4 successively;
Step 2, vibration amplitude by shock sensor downhole joint self;
Step 3, signal by power current sensor measurement sheath ground current;
Step 4, by High Frequency Current Sensor also measure local discharge signal;
Step 5, according to above-mentioned vibration amplitude, sheath ground current and Partial Discharge Data carry out the fault analyzing to navigate to which joint.
4. a kind of single-core power cables on-line condition monitoring method according to claim 3, it is characterized in that, if vibrations are normal, then judge successively sheath ground current and shelf depreciation whether normal, if be all normal, then illustrate it is that the change of ambient temperature causes cable surface temperature to rise.
5. a kind of single-core power cables on-line condition monitoring method according to claim 3, it is characterized in that, if vibrations are abnormal, then measure sheath ground current and Partial Discharge Data according to step 3 and step 4, if sheath ground current and local discharge parameters normal, be then judged as that the folder of cable self and fixture loosen and cause temperature to rise.
6. a kind of single-core power cables on-line condition monitoring method according to claim 3; it is characterized in that; if cable cover(ing) ground current becomes large; vibrations and local discharge parameters normally, are then judged as that the temperature that cable jacket breakage, cable heavy overload or sheath protector earth fault cause raises.
7. a kind of single-core power cables on-line condition monitoring method according to claim 3, is characterized in that, if shelf depreciation is excessive, vibrations and sheath ground current normally, are then because the existence insulation cracking of cable major insulation causes temperature to rise.
8. a kind of single-core power cables on-line condition monitoring method according to claim 3, is characterized in that, if ground current and shelf depreciation all become large, is then that the temperature that comprehensive dual reason causes rises.
9. a kind of single-core power cables on-line condition monitoring method according to claim 3, is characterized in that, the parameter of described temperature is small data quantity, and Refresh Data rate is 0.5 second.
10. a kind of single-core power cables on-line condition monitoring method according to claim 3, it is characterized in that, described vibrations abnormality judgment method is, when normal 110kV cable runs, the amplitude of oscillation of vibrations is generally less than 100 μm, shakes the amplitude of oscillation and be greater than 100 μm of existence extremely when running under nominal load;
Sheath ground current value requires to be not more than 10% of load, is considered as exception more than 10%; The specified temperature being responsible for lower fibre core of cable is no more than 90 °, if more than 90 °, is considered as exception.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106353579A (en) * | 2016-08-30 | 2017-01-25 | 浙江图维科技股份有限公司 | Device and method for integrated monitoring of cable current, conductor temperature and internal partial discharge |
| CN106502865A (en) * | 2016-11-02 | 2017-03-15 | 郑州云海信息技术有限公司 | Power consumption dynamic trend analysis method and device based on frequent Sensor monitoring |
| CN106896300A (en) * | 2017-01-13 | 2017-06-27 | 浙江大学 | The monitoring device of power cable connector temperature and PD parameters |
| CN107765116A (en) * | 2017-09-18 | 2018-03-06 | 浙江白云源电气有限公司 | A kind of on-line monitoring method for cable termination on-Line Monitor Device |
| CN109725242A (en) * | 2019-03-14 | 2019-05-07 | 深圳供电局有限公司 | Single-core cable local discharge sensor and local discharge sensor array |
| CN109738770A (en) * | 2019-03-05 | 2019-05-10 | 四川艾德瑞电气有限公司 | A kind of integration insulating tube type busbar connector monitoring system |
| CN110044408A (en) * | 2019-01-27 | 2019-07-23 | 西安明天仪器有限公司 | Monitor cable system on-line |
| CN110146126A (en) * | 2019-05-10 | 2019-08-20 | 深圳供电局有限公司 | Cable connector stability monitoring method and cable connector monitor system |
| CN113253071A (en) * | 2021-05-24 | 2021-08-13 | 全球能源互联网研究院有限公司 | Current sensor and cable state monitoring device based on magnetic resistance effect |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106353579A (en) * | 2016-08-30 | 2017-01-25 | 浙江图维科技股份有限公司 | Device and method for integrated monitoring of cable current, conductor temperature and internal partial discharge |
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| CN106896300A (en) * | 2017-01-13 | 2017-06-27 | 浙江大学 | The monitoring device of power cable connector temperature and PD parameters |
| CN106896300B (en) * | 2017-01-13 | 2019-04-05 | 浙江大学 | The monitoring device of power cable connector temperature and PD parameter |
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| CN109738770A (en) * | 2019-03-05 | 2019-05-10 | 四川艾德瑞电气有限公司 | A kind of integration insulating tube type busbar connector monitoring system |
| CN109725242A (en) * | 2019-03-14 | 2019-05-07 | 深圳供电局有限公司 | Single-core cable local discharge sensor and local discharge sensor array |
| CN110146126A (en) * | 2019-05-10 | 2019-08-20 | 深圳供电局有限公司 | Cable connector stability monitoring method and cable connector monitor system |
| CN113253071A (en) * | 2021-05-24 | 2021-08-13 | 全球能源互联网研究院有限公司 | Current sensor and cable state monitoring device based on magnetic resistance effect |
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