CN103926510B - A kind of cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing localization method - Google Patents
A kind of cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing localization method Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 37
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- 238000003745 diagnosis Methods 0.000 claims abstract description 19
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Abstract
The present invention relates to a kind of cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing localization method, belong to power cable on-line monitoring and fault diagonosing and field of locating technology.Technical scheme is: circulating current and current-carrying capacity sensor synchronous acquisition current data are also uploaded to data management platform by communication network; Data management platform timed collection, automatically process and interim or permanent storage Condition Monitoring Data, and all status datas are shown in real time on Surveillance center's screen, various data sheet function is provided simultaneously; Fault diagnosis system is extracted the real-time circulating current data in database management platform and is compared with desired value; Once the fault in discovery cable, by alarm unit for cable operation maintenance personnel provide early warning information.Energy Real-Time Monitoring power cable ruuning situation of the present invention, automatically carries out fault diagnosis location and early warning, can also locate the cable fault type chosen by Accurate Diagnosis, save manpower financial capacity when there is abnormal monitoring information.
Description
Technical field
The present invention relates to a kind of cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing localization method, particularly relate to a kind of ratio relation by cross interconnected cable sheath electric current real-time measurement values and desired value to diagnose and the method for positioning cable fault, belong to power cable on-line monitoring and fault diagonosing and field of locating technology.
Background technology
Along with the development in city, the quantity of 110kV and the application of above single core high voltage power cable sharply increases, and cable load increases day by day, and the cable metal sheath ground current problem that the operation of a large amount of single core cable brings more and more receives the concern of people.Under normal circumstances, the metal sheath of 110kV and above high voltage single-core cable generally adopts cross interconnected two sides earth or the single-ended directly grounded method of operation.Specify according to GB-50217 " Code for design of cables of electric works ": on the metal level of interchange single-core power cables, the normal induction potential maximum at any point non_direct ground place should meet following regulation: when not taking the safety practice that effectively can prevent any contact metal layer of personnel, must not be greater than 50V; Except above-mentioned situation, 300V must not be greater than.High-tension cable adopts single cored structure due to its structure, and according to electromagnetic principles, this must cause on protective metal shell and occurs induced voltage.In order to reduce the induced voltage on cable cover(ing), making it can not be excessive, will by cable metal sheath segmented ground in engineering, to limit the size of induced voltage.Under normal circumstances, the induced voltage in sheath is lower, meets design standards.But; when the cross connection grounding point of intermediate head or cable body metal sheath break down; outer jacket can be caused to puncture or sheath protector burns; cable major insulation more seriously can be caused to puncture; likely there is multipoint earthing in metal sheath in this case; form very high circulating current; so both reduce the current-carrying capacity of cable; waste again electric energy and form loss; and it is aging to accelerate cable insulation; therefore need regularly to detect the ground current of above-mentioned cable metal sheath, with the power failure preventing cable fault from causing unplanned property.
The detection means of background technology mainly comprises: (1) regular or irregular manual patrol, to find the exception of high-tension cable and affiliated facility thereof and hidden danger and to process in time; (2) regularly artificial infrared thermal imaging test is carried out to the critical cables such as hv cable termination, intermediate head annex; (3) regular manual measurement high-tension cable metal sheath electric current; (4) carry out a preventive trial to important Voltage Cable Lines Construction every year, main project comprises test insulation resistance of main, insulating sheath resistance and major insulation and does AC voltage withstand test.In real work, because the laying total length of Voltage Cable Lines Construction increases gradually, all strictly carry out artificial daily operation maintenance and service work by code and be difficult to realize due to its high cost of labor.Especially high-voltage cable joint or terminal are arranged in special electric power work well or on high-tension cable shaft tower usually, and the state parameters such as the metal sheath electric current of these cables of manual measurement or surface temperature need to spend a large amount of human and material resources, financial resources; Simultaneously due to periodic detection or tour circuit, usually the real-time running state of high-tension cable cannot be known the interval time of patrolling and examining for twice in section, so that before high-tension cable fault occurs, operation maintenance personnel cannot obtain necessary early warning information in time, cause the economic loss that some are unnecessary.Therefore, it is very necessary for developing a set of circulating current on-line monitoring technique that can be used for cable fault diagnosis location.
Summary of the invention
The object of the invention is to provide a kind of cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing localization method, is realized diagnosis and the location of fault in cable by circulating current on-line monitoring, solves Problems existing in background technology.
Technical scheme of the present invention is:
A kind of cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing localization method, comprise following steps:
1. cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing location is realized by data acquisition module, communication network, data management platform and fault diagnosis module;
2. data acquisition module is made up of multiple circulating current sensor and a current-carrying capacity sensor; Cross connection grounding case incoming line place under the charged ruuning situation of cable is set with pincerlike current sensor to gather circulating current signal and by being sleeved on the pincerlike current sensor on cable body, to gather current-carrying capacity of cable data; By data collecting card synchronous acquisition current signal; Upload the circulating current signal that collects and current-carrying capacity data to data management platform carries out theory calculate and stored in a database by cable information;
The circulating current signal of the circulating current 3. in data acquisition module and current-carrying capacity sensor sample high-tension cable and current-carrying capacity data, be then uploaded to the data management platform being positioned at Surveillance center by communication network; Data management platform timed collection, automatically process and interim or permanent storage Condition Monitoring Data, and all status datas are shown in real time on Surveillance center's screen, various data sheet function is provided simultaneously; The database of data management platform is used for depositing the Condition Monitoring Data of various interim or permanent storage; The data of temporary reservoir are made up of Real-time Monitoring Data; The data of permanent storage comprise the parameters value of object cable: section length, phase spacing, cable design parameter, and the circulating current desired value under different load conditions of each measurement point in the non-faulting situation gone out according to these parameter value calculation and the ratio relation of two joint circulating current measured values;
4. fault diagnosis module is by comparing the expected value stored in the data of Real-Time Monitoring and cable status database, the health status of assessment cable; When the deviation of cable real time data and non-faulting state desired value is greater than setting value, according to the status information in database, the typical fault in cable is diagnosed and locates.
The present invention is also provided with alarm unit, comprises large screen display interface and the alarm mode jumping out warning window; When there is early warning information, monitoring main frame can notify high-tension cable operation maintenance personnel timely and effectively, achieve the object of the comprehensive on-line monitoring of high-tension cable state, early warning, be convenient to the state that high-tension cable operation maintenance personnel grasp cable and running environment thereof at any time, Timeliness coverage defect, avoids electric power accident occurs.
The invention has the beneficial effects as follows: (1) energy Real-Time Monitoring power cable ruuning situation, is transferred to the data management platform record analysis of system, automatically carries out fault diagnosis location and early warning when there is abnormal monitoring information by monitoring information; (2) equal for cable section length and the cross interconnected threephase cable of return wire is installed, propose a set of circulating current amplitude standard that can be used for cable fault diagnosis location; (3) overcome in existing fault diagnosis technology, the simple criterion of circulating current change, can also locate the cable fault type chosen by Accurate Diagnosis; After having abandoned unusual circumstance, carried out the traditional approach of trouble-shooting point by line walking, save manpower financial capacity.
Accompanying drawing explanation
Fig. 1 is the structural drawing of circulating current on-line monitoring level fault diagnosis positioning system; 1 is Surveillance center, and 2 is data acquisition modules, comprises multiple current sensor, and 3 is fault diagnosis locating modules, and 4 is alarm units, and 5 is Database Systems, and 6 is communication systems;
Fig. 2 is the cross interconnected wiring of threephase cable and sensor scheme of installation.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, fundamental purpose of the present invention is the circulating current on-line monitoring function realized in high-tension cable metal sheath, realizes the real-time monitoring to Voltage Cable Lines Construction, and can Timeliness coverage cable fault defect and send warning.Circulating current and current-carrying capacity sensor synchronous acquisition current data are also uploaded to data management platform by communication network.Data management platform timed collection, automatically process and interim or permanent storage Condition Monitoring Data, and all status datas are shown in real time on Surveillance center's screen, various data sheet function is provided simultaneously.Fault diagnosis system is extracted the real-time circulating current data in database management platform and is compared with desired value.Once the fault in discovery cable, then its type of automatic diagnosis be positioned to place joint or loop, simultaneously by alarm unit for cable operation maintenance personnel provide early warning information.
As shown in Figure 2, for cross connection grounding case JX1, the electric current that three measurement point current transformers are surveyed is respectively
,
,
, for cross connection grounding case JX2, the electric current that three measurement point current transformers are surveyed is respectively
,
,
, measured by current-carrying capacity sensor, three-phase equilibrium load current is
.Then by ratio and the circulating current of circulating current and current-carrying capacity
,
,
between three ratios, following several fault can be diagnosed and be positioned to place joint or sheath loop, as shown in table 1.
With
represent circulating current desired value (desired value changes with load), use
represent
represent
desired value, then when threephase cable section length is equal and system is provided with return wire, fault diagnosis and location can according to following standards:
" if the real-time measurement values at certain sensor place is 0 ";
Fault type=" this place's sensor fault "
" if real-time measurement values is all 0 ";
Fault type=" circuit is unloaded "
If " for arbitrarily
, can inequality be made
to set up and for arbitrarily
, can inequality be made
set up ";
Circuit normally runs
If " exist
, make inequality
to set up and for arbitrarily
, can inequality be made
set up ", then enter this section of determination flow:
If " for arbitrarily
, can inequality be made
to set up and for arbitrarily
, can inequality be made
set up ";
Fault type=" 1 "
If " for arbitrarily
, can inequality be made
to set up and for arbitrarily
, can inequality be made
set up ";
Fault type=" 2 "
If " for arbitrarily
, can inequality be made
to set up and for arbitrarily
, can inequality be made
set up ";
Fault type=" 3 "
If " for arbitrarily
, can inequality be made
set up ";
Fault type=" 6 "
Otherwise fault type=" UNKNOWN TYPE "
If " exist
make inequality
set up and exist
, make inequality
set up ", then enter this section of determination flow:
If " for arbitrarily
, can inequality be made
set up ";
Fault type=" 4 "
If " for arbitrarily
, can inequality be made
set up ";
Fault type=" 5 "
If "
and exist
, make inequality
set up ";
Fault type=" 7 "
If "
and for arbitrarily
, can inequality be made
set up ";
Fault type=" 10 "
If "
and exist
, make inequality
set up ";
Fault type=" 8 "
If "
and for arbitrarily
, can inequality be made
set up ";
Fault type=" 11 "
If "
and exist
, make inequality
set up ";
Fault type=" 9 "
If "
and for arbitrarily
, can inequality be made
set up ";
Fault type=" 12 "
Otherwise fault type=" UNKNOWN TYPE "
When the circulating current numerical value of Real-Time Monitoring reaches fault expection current value, fault diagnosis positioning system is automatically according to kind and the position of the size failure judgement of measured data, and in the large screen display early warning information of Surveillance center, cable operation maintenance personnel can be processed early, for ensureing that power system stability provides important support to fault.
Claims (2)
1. cable sheath electric current and a current-carrying capacity on-line monitoring and fault diagonosing localization method, is characterized in that, comprise following steps:
1. cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing location is realized by data acquisition module, communication network, data management platform and fault diagnosis module;
2. data acquisition module is made up of multiple circulating current sensor and a current-carrying capacity sensor; Cross connection grounding case incoming line place under the charged ruuning situation of cable is set with pincerlike current sensor to gather circulating current signal and by being sleeved on the pincerlike current sensor on cable body, to gather current-carrying capacity of cable data; By data collecting card synchronous acquisition current signal; Upload the circulating current signal that collects and current-carrying capacity data to data management platform carries out theory calculate and stored in a database by cable information;
The circulating current signal of the circulating current 3. in data acquisition module and current-carrying capacity sensor sample high-tension cable and current-carrying capacity data, be then uploaded to the data management platform being positioned at Surveillance center by communication network; Data management platform timed collection, automatically process and interim or permanent storage Condition Monitoring Data, and all status datas are shown in real time on Surveillance center's screen, various data sheet function is provided simultaneously; The database of data management platform is used for depositing the Condition Monitoring Data of various interim or permanent storage; The data of temporary reservoir are made up of Real-time Monitoring Data; The data of permanent storage comprise the parameters value of object cable: section length, phase spacing, cable design parameter, and the circulating current desired value under different load conditions of each measurement point in the non-faulting situation gone out according to these parameter value calculation and the ratio relation of two joint circulating current measured values;
4. fault diagnosis module is by comparing the expected value stored in the data of Real-Time Monitoring and cable status database, the health status of assessment cable; When the deviation of cable real time data and non-faulting state desired value is greater than setting value, according to the status information in database, the typical fault in cable is diagnosed and locates.
2. a kind of cable sheath electric current according to claim 1 and current-carrying capacity on-line monitoring and fault diagonosing localization method, is characterized in that being provided with alarm unit, comprises large screen display interface and the alarm mode jumping out warning window; When there is early warning information, monitoring main frame can notify high-tension cable operation maintenance personnel timely and effectively, achieve the object of the comprehensive on-line monitoring of high-tension cable state, early warning, be convenient to the state that high-tension cable operation maintenance personnel grasp cable and running environment thereof at any time, Timeliness coverage defect, avoids electric power accident occurs.
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