A kind of distribution network fault detection systemTechnical field
The present invention relates to electric power network technique field is and in particular to a kind of detection of distribution network failure of distribution network fault detection system isSystem.
Background technology
China's power distribution network has that line construction is complicated, the various changeable, spy such as faults frequent is complicated, maintenance workload is big of environmentLevy.A certain section of distribution line breaks down, and needs to investigate fault generation position paragraph by paragraph, not only working strength is big, but also can prolongBy mistake emergency repair time, affects power supply reliability, and in actual use, line voltage is to household electrical appliance, industrial automation equipment, medicalThe normal use of the electric network terminal equipment such as instrument and meter and service life have a very big impact.At present, the fluctuation of line voltageLarger, especially in rural area, the fluctuation of line voltage is bigger；Too high line voltage often shortens making of electric network terminal equipmentWith the life-span, sometimes even electric network terminal equipment can be made to burn；And too low line voltage is then likely to result in electric network terminalEquipment cisco unity malfunction.Currently used detecting system and its detection method, can only be rough fault coverage is detected, andTimely and effectively failure cause and trouble point can not be confirmed and be analyzed and processed.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of distribution network fault detection system of distribution network fault detection system,This system and method accurately can be positioned to the reason fault and trouble point, reduces the time that maintenance has a power failure, and raising setsStandby utilization rate and operational reliability, reduce the cost of overhaul simultaneously.
For solving above-mentioned technical problem, the present invention employs the following technical solutions：
A kind of distribution network fault detection system, including current transformer, distribution terminal, photoelectric conversion unit, information acquisition unit,Data analysis unit, fault level judging unit, fault location module, warning device and fault display unit；Described electric current is mutualThe output end of sensor is connected with the input of information acquisition unit through photoelectric conversion unit, its output end through data analysis unit withThe input of fault level judging unit is connected, and its output end is connected with the input of fault location module, fault location moduleOutput end be connected with warning device, fault display unit respectively, the output end of described distribution terminal and information acquisition unitInput is connected.
Described photoelectric conversion unit is used for for the electric signal of acquisition being converted to optical signal, and the optical information that this is changed is carried outStorage and transmission.
Described fault location module is used for detecting fault-signal, and this fault-signal is carried out statistical analysis, determines faultPoint position, and this abort situation point is carried out interim storage.
The invention has the beneficial effects as follows：Present invention achieves effectively being monitored to whole station secondary device running status, haveEffect reduces artificial regular inspection project, reduces the maintenance power off time of equipment, improves reliability and operating efficiency.Can accurately judge simultaneouslyWhether power system is broken down or is had unusual service condition, therefore, it is possible to reliably carry out relay protection to power system.
Brief description
Fig. 1 is the system block diagram of the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in figure 1, the distribution network fault detection system of the present embodiment, including current transformer 1, distribution terminal 3, photoelectricityConverting unit 2, information acquisition unit 4, data analysis unit 5, fault level judging unit 6, fault location module 7, dress of reporting to the policePut 8 and fault display unit 9；The input through photoelectric conversion unit 2 and information acquisition unit 4 for the output end of current transformer 1It is connected, its output end is connected with the input of fault level judging unit 6 through data analysis unit 5, its output end is fixed with faultThe input of position module 7 is connected, and the output end of fault location module 7 is connected with warning device 8, fault display unit 9 respectively, joinsThe output end of electric terminals 3 is connected with the input of information acquisition unit 4.
This photoelectric conversion unit 2 is used for for the electric signal of acquisition being converted to optical signal, and the optical information that this is changed is carried outStorage and transmission.Fault location module 7 is used for detecting fault-signal, and this fault-signal is carried out statistical analysis, determines faultPoint position, and this abort situation point is carried out interim storage.
Operation principle：Current transformer 1 obtains current information from electrical network, and the electric signal obtaining is passed through opto-electronic conversion listUnit 2 is sent to information acquisition unit 4 after being converted to optical signal, information acquisition unit 4 collection the former of distribution terminal sets current dataInformation, this data message is sent collectively to data analysis unit 5 together with the current information collecting, this data analysis unit 5The data collecting is compared, finds the numerical value being consistent therewith or being close, thus obtaining corresponding to optical signalsData level, the data of the fault level after differentiating and malfunction analysis procedure is sent jointly to fault location module 7, this faultLocating module 7 is analyzed positioning according to the data message receiving, and the information after positioning is entered by fault display unitRow display, when fault level exceeds preset range or fault location module 7 can not find abort situation, warning device reportAlert, point out importance and the emergency of this fault.
Present invention achieves effectively being monitored to whole station secondary device running status, effectively reduce artificial regular inspection project,The maintenance power off time of reduction equipment, improves reliability and operating efficiency.Can accurately judge whether power system occurs event simultaneouslyHinder or have unusual service condition, therefore, it is possible to reliably relay protection be carried out to power system.Those skilled in the artIt should be appreciated that above embodiment is intended merely to the present invention is described, and it is not used as limitation of the invention, as long asWithin the spirit of the present invention, the suitable change that above example is made and change all fall claimedWithin the scope of.