CN103983901A - Online failure positioning method for ring main unit cable line - Google Patents
Online failure positioning method for ring main unit cable line Download PDFInfo
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- CN103983901A CN103983901A CN201410236346.1A CN201410236346A CN103983901A CN 103983901 A CN103983901 A CN 103983901A CN 201410236346 A CN201410236346 A CN 201410236346A CN 103983901 A CN103983901 A CN 103983901A
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Abstract
The invention discloses an online failure positioning method for a ring main unit cable line, and relates to the technical field of a power cable failure positioning method. The failure positioning method comprises the steps that a failure current monitoring detection system is composed of a plurality of ring main unit monitoring points. Failure current detection of one monitoring point is composed of one set of three three-phase high-frequency pulse current sensors. The three high-frequency pulse current sensors are respectively arranged on a three-phase cable of any one loop cable, and the high-frequency pulse current sensors are connected with an in-place signal processing host through a coaxial line, the trigger time of a received failure signal is precisely compared with satellite time of a GPS, and a 3G wireless data transmission unit is connected with a 3G wireless data receiving unit through a 3G wireless network. When the insulation failure happens to a 10 kV-35 kV power distribution system cable, the failure current pulse can be detected at the first time, the positions of the failure points can be automatically calculated according to the failure signal trigger time detected by substations distributed in a plurality of ring main units, the positioning time is short, the positioning precision is high, and high reliability is achieved.
Description
technical field:
The present invention relates to power cable fault localization method technical field, be specifically related to the localization method of the online fault locator of a kind of 10kV of being applied to-35kV distribution system cable.
background technology:
10kV-35kV cable distribution system is huge, and number of cables is many, lays path intricate, once there is insulation fault, is difficult to find trouble spot.Localization of fault is done at scene, and now general way is, after fault occurs, transfer localization of fault instrument and make assignment test, use be pulse voltage echo-bearing method.And use this device need to untie the terminal of failure cable, and one end of cable is connected with the pulse voltage output terminal of locating device, just can start to do assignment test operation.Because test at scene temporarily, usually run into the restriction of many execution conditions, result need spend a large amount of time, and manpower and attached equipment.
Pulse voltage echo-bearing method only, at a terminal sensor installation of failure cable circuit, need to be transferred localization of fault instrument to operation field.After the row wave speed of known this failure cable circuit, localization of fault instrument can inject high pressure (as Fig. 1), high pressure can allow trouble spot that insulation fault occurs again, thereby in trouble spot, produce a fault current pulse wave signal, signal to injection side transmission is called the first echo, and sensor capture time is t
1; Fault current pulse wave signal returns the signal of injection side through other end end reflection, be called the second echo, and sensor capture time is t
2, draw the oscillogram as Fig. 2, by computing formula, draw the position of failure point of this failure cable circuit: establishing trouble spot and sensor distance is X, and fault propagation speed V and circuit overall length L are known, distance=velocity of wave * mistiming, i.e. 2 (L-X)=t
12* V; X=L-t
12* V/2.
Both-end localization method (as Fig. 3) based on cable two ends, the method is improved on the basis of pulse voltage echo-bearing method, but the method use optical fiber to time, can only rely on judge the position of trouble spot two mistimings between test point, can only demarcate position of failure point by one group of mistiming data, the positioning result error often obtaining is larger.As Fig. 4, establishing fault propagation speed is V, constant speed.Distance/time=velocity of wave, that is: Δ L/ Δ t=V; X=(L-t
12* V)/2.And the problem that also has signal to collect: the 10kV-35kV distribution system cable distribution in reality is complicated, lays optical fiber difficulty larger, can not play quick, accurately, locating effect reliably.
In sum, there is following defect in pulse voltage echo-bearing method: 1, during cable generation insulation fault, need the long period just can orient position of failure point; 2, whole system running needs palpus manipulated untwisted cable circuit, troublesome poeration; 3, having high input in long, manpower and materials positioning time, has increased the security risk of repairing process.There is following defect in both-end localization method: 1, positioning error is large, poor practicability, and reliability is not high.
summary of the invention:
The object of this invention is to provide the online Fault Locating Method of a kind of ring main unit cable line, it is when 10kV-35kV distribution system cable generation insulation fault, can fault current pulse be detected and can trigger constantly according to the detected fault-signal in the substation that is distributed in a plurality of ring main units in the very first time, automatically the position that calculates trouble spot, positioning time is short, easy and simple to handle, quick, practicality is good, reliability is high, reduces the input of manpower and materials, reduces the security risk in repairing process.
In order to solve the existing problem of background technology, the present invention is by the following technical solutions: its Fault Locating Method is: fault current monitors that detection system is comprised of a plurality of ring main units monitoring point.The fault current detection of a monitoring point is comprised of three high-frequency electrical pulses flow sensor of one group of three-phase (HFCT), and three high-frequency electrical pulses flow sensor (HFCT) are arranged on respectively on the threephase cable of any return cable.High-frequency electrical pulses flow sensor (HFCT) with regard to earth signal processing host (LS), by coaxial cable, be connected; The fault-signal receiving trigger constantly by the gps satellite time accurately to time; 3G wireless data transmission unit is connected by 3G wireless network with 3G receive data by wireless unit; Localization of fault result is automatically calculated and is demarcated by mother station.While having insulation fault to produce in circuit, trouble spot can produce a pulse signal with certain amplitude, this pulse signal can transfer to each ring main unit being connected, as reach the trigger value that ring main unit check point sets, will and trigger constantly by substation wave recording, and transfer data to mother station by 3G wireless data transmission unit, mother station receives signal by 3G receive data by wireless unit and triggers constantly and wave recording, then calculate and orient position, trouble spot, error range is no more than 20m the computer program energy automatic quick of mother station.
Localization of fault principle of the present invention is: be used in online fault locator, running status to 10kV-35kV power cable is carried out real time on-line monitoring, when a certain point of power cable breaks down, the pulse wave signal producing in trouble spot by the energy of circuit own can be transferred to coupled circuit along circuit, in a plurality of ring main units that can be connected in trouble spot, the very first time detects fault current pulse, and each monitoring point is detected to fault-signal trigger and to be pooled to mother station constantly, computer program can trigger constantly according to the fault-signal from each monitoring point, be the many groups mistiming data between a plurality of substations, then obtain multiple positioning result, and indicate after automatically calculating position of failure point.
The present invention has following beneficial effect:
1,, during cable generation breakdown fault, in a few minutes, just can automatically orient position of failure point;
2, whole system running need not manipulated untwisted cable circuit any tie lines and use Method of Cable Trouble Point orientator;
3, efficiently automatically orient trouble spot, reliably, error range is less than 20m, and safety reaches run unit real requirement, and reduces the input in positioning time and manpower and materials, also reduces the security risk of repairing process.
Accompanying drawing explanation:
Fig. 1 is localization of fault instrument positioning principle figure in background technology,
Fig. 2 is localization of fault instrument location oscillogram in background technology,
Fig. 3 is both-end localization method positioning principle figure in background technology,
Fig. 4 is both-end localization method location oscillogram in background technology,
Fig. 5 is the online fault location system structured flowchart that the present invention applies,
Fig. 6 is the online fault location system four station application drawings of embodiment mono-ring main unit cable line,
Fig. 7 is the multiple location Calculation mode of embodiment mono-oscillogram.
Embodiment:
With reference to Fig. 5, this embodiment by the following technical solutions: its fault location system comprises high-frequency electrical pulses flow sensor (HFCT); With regard to earth signal processing host (hereinafter referred to as substation, being also called for short LS); Localization process main frame in set of signals (hereinafter referred to as mother station, being also called for short MS), high-frequency electrical pulses flow sensor (HFCT) is arranged on respectively on threephase cable, and substation is connected by network with mother station.Substation comprise advance signal processing module (APC), modulus signal modular converter (ADC), satellite to time signal receiving module (GPS) and 3G wireless data transmission unit (DTU), advance signal processing module (APC) is connected with modulus signal modular converter (ADC), modulus signal modular converter (ADC) respectively with satellite to time signal receiving module (GPS) be connected with 3G wireless data transmission unit (DTU); Mother station comprises interconnective computing machine and 3G receive data by wireless unit.
The localization of fault principle of this embodiment is: be used in online fault locator, running status to 10kV-35kV power cable is carried out real time on-line monitoring, when a certain point of power cable breaks down, the pulse wave signal producing in trouble spot by the energy of circuit own can be transferred to coupled circuit along circuit, in a plurality of ring main units that can be connected in trouble spot, the very first time detects fault current pulse, and each monitoring point is detected to fault-signal trigger and to be pooled to mother station constantly, computer program can trigger constantly according to the fault-signal from each monitoring point, be the many groups mistiming data between a plurality of substations, then obtain multiple positioning result, and indicate after automatically calculating position of failure point.
The computing formula of this embodiment is:
,
(with reference to Fig. 7, X is the distance of trouble spot and nearest test point, and L is length between two test points, and △ t is that any two the fault-signal triggered times that receive are poor, and V is the row wave speed of institute's detection line cable, and establishing fault propagation speed is V, constant speed.Distance/time=velocity of wave, that is: Δ L/ Δ t=V).This process just realizes the function of on-line monitoring, trouble spot, multiple location.
This embodiment has realized on-line monitoring, locates in real time the function of position of failure point.The work of whole system is all live monitoring, any tie lines and equipment that need not manipulated untwisted cable circuit.When fault occurs, the reliability service of this cover system has just greatly reduced repair personnel's the repairing time, reduces the indirect loss causing because of fault.Generally, the about 100A of wave head peak value of cable earth fault moment, can transmit several kilometers (minimum 2 kilometers) along cable line, has 3 to 6 ring main units in the circuit of several kilometers, and the general 500m of ring main unit distributes one.These substations receive signal, and reach the trigger value of setting, the data message that will send this signal by data transmission unit DTU is to mother station, mother station can be by all data messages that receive of Computer calculation and Analysis, poor constantly paired computing time to the signal triggering that two ends, trouble spot are all, with this, obtain multiple positioning result, and demarcate on computers position of failure point.
Embodiment:
Embodiment mono-: with reference to Fig. 6, the present embodiment is the online fault location system four station application of ring main unit cable line, it comprises: be located at respectively #1 ring main unit/terminal, #2 ring main unit/terminal, #3 ring main unit/terminal and the #4 ring main unit/terminal at 10kV-35kV distribution power cable two ends, with regard to earth signal processing host LS1, with regard to earth signal processing host LS2, with regard to earth signal processing host LS3, be located at respectively #1 ring main unit/terminal, #2 ring main unit/terminal, #3 ring main unit/terminal and #4 ring main unit/terminal with regard to earth signal processing host LS4.
#1 ring main unit/terminal comprises with regard to earth signal processing host LS1, and high-frequency electrical pulses flow sensor S1; #2 ring main unit/terminal comprises with regard to earth signal processing host LS2, and high-frequency electrical pulses flow sensor S2; #3 ring main unit/terminal comprises with regard to earth signal processing host LS3, and high-frequency electrical pulses flow sensor S3; #4 ring main unit/terminal comprises with regard to earth signal processing host LS4, and high-frequency electrical pulses flow sensor S4.
High-frequency electrical pulses flow sensor (HFCT) is connected with 10kV power cable; With regard to the gps clock of earth signal processing host LS1, with regard to the gps clock of earth signal processing host LS2, with regard to the gps clock of earth signal processing host LS3 and with regard to the gps clock of earth signal processing host LS4 by gps satellite to time; With regard to the DTU of earth signal processing host LS1, with regard to the DTU of earth signal processing host LS2, with regard to the DTU of earth signal processing host LS3 with carry out data by 3G wireless network with localization process main frame MS in set of signals with regard to the DTU of earth signal processing host LS4 and be connected.
Its groundwork principle is:
With regard to earth signal processing host LS1, receive the fault traveling wave 1 that trouble spot produces; In the moment that receives fault traveling wave 1 with regard to the gps clock record of earth signal processing host LS1, by DTU, send data to localization process main frame MS in set of signals simultaneously and carry out data analysis;
With regard to earth signal processing host LS2, receive the fault traveling wave 1 that trouble spot produces; In the moment that receives fault traveling wave 1 with regard to the gps clock record of earth signal processing host LS2, by DTU, send data to localization process main frame MS in set of signals simultaneously and carry out data analysis;
With regard to earth signal processing host LS3, receive the fault traveling wave 1 that trouble spot produces; The gps clock record of LS3 receives the moment of fault traveling wave 1, sends data to localization process main frame MS in set of signals simultaneously carry out data analysis by DTU;
With regard to earth signal processing host LS4, receive the fault traveling wave 1 that trouble spot produces; In the moment that receives fault traveling wave 1 with regard to the gps clock record of earth signal processing host LS4, by DTU, send data to localization process main frame MS in set of signals simultaneously and carry out data analysis;
In set of signals localization process main frame MS data analysis according to the triggering sending with regard to DTU in earth signal processing host LS1 data, the triggering that sends with regard to DTU in earth signal processing host LS2 constantly data, the triggering that sends with regard to DTU in earth signal processing host LS3 constantly data and the triggering that sends with regard to DTU in earth signal processing host LS4 constantly constantly data calculate the particular location of trouble spot in distribution power cable.
As Fig. 7, in one embodiment, in set of signals, localization process main frame (mother station) carries out data analysis and calculates the computing formula of the particular location of trouble spot in 10kV power cable and be:
In formula, t
1for receive the moment of fault traveling wave 1, t with regard to earth signal processing host LS1
2for receive the moment of fault traveling wave 1 with regard to earth signal processing host LS2, L is the length of 10kV-35kV distribution power cable between two substations, and V is the velocity of propagation of fault traveling wave in be measured net power cable line.
The moment that insulation fault produces, down pulse ripple can be transferred to coupled ring main unit along distribution line, and our high-frequency electrical pulses flow sensor (HFCT) very first time detects fault current pulse, and all fault-signals that detect are triggered and are constantly pooled to mother station, the computer program of mother station can calculate t
1with t
2mistiming, t
1with t
3mistiming, t
1with t
4mistiming; t
2with t
3mistiming, t
2with t
4mistiming; t
3with t
4mistiming.Distance between each substation and velocity of wave have obtained by correction when system and device is installed.The above-mentioned computing formula of the mother station automatic double counting of meeting, obtains many group mistiming data for same fault-signal, thereby multiplicity location is carried out in this trouble spot, guarantees accuracy and the reliability of location.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention, any technician who is familiar with this professional domain, do not departing within the scope of technical scheme of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (3)
1. the online Fault Locating Method of ring main unit cable line, the Fault Locating Method that it is characterized in that it is: fault current monitors that detection system is comprised of a plurality of ring main units monitoring point, the fault current detection of a monitoring point is comprised of three high-frequency electrical pulses flow sensor of one group of three-phase (HFCT), three high-frequency electrical pulses flow sensor (HFCT) are arranged on respectively on the threephase cable of any return cable, high-frequency electrical pulses flow sensor (HFCT) with regard to earth signal processing host (LS), by coaxial cable, be connected; The fault-signal receiving trigger constantly by the gps satellite time accurately to time; 3G wireless data transmission unit is connected by 3G wireless network with 3G receive data by wireless unit; Localization of fault result is automatically calculated and is demarcated by mother station.
2. the online Fault Locating Method of ring main unit cable line, it is characterized in that localization of fault principle is: be used in online fault locator, running status to 10kV-35kV power cable is carried out real time on-line monitoring, when a certain point of power cable breaks down, the pulse wave signal producing in trouble spot by the energy of circuit own can be transferred to coupled circuit along circuit, in a plurality of ring main units that can be connected in trouble spot, the very first time detects fault current pulse, and each monitoring point is detected to fault-signal trigger and to be pooled to mother station constantly, computer program can trigger constantly according to the fault-signal from each monitoring point, be the many groups mistiming data between a plurality of substations, then obtain multiple positioning result, and indicate after automatically calculating position of failure point.
3. the online Fault Locating Method of ring main unit cable line according to claim 1, is characterized in that its fault location system comprises high-frequency electrical pulses flow sensor (HFCT); With regard to earth signal processing host, hereinafter referred to as substation; Localization process main frame in set of signals, hereinafter referred to as mother station, high-frequency electrical pulses flow sensor (HFCT) is arranged on respectively on threephase cable, and substation is connected by network with mother station; Substation comprise advance signal processing module (APC), modulus signal modular converter (ADC), satellite to time signal receiving module (GPS) and 3G wireless data transmission unit (DTU), advance signal processing module (APC) is connected with modulus signal modular converter (ADC), modulus signal modular converter (ADC) respectively with satellite to time signal receiving module (GPS) be connected with 3G wireless data transmission unit (DTU); Mother station comprises interconnective computing machine and 3G receive data by wireless unit.
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| EP3798648A1 (en) * | 2019-09-26 | 2021-03-31 | Electricité de France | Method for determining the position of a fault precursor in a high-voltage cable in operation |
| FR3101426A1 (en) * | 2019-09-26 | 2021-04-02 | Electricite De France | Method for determining a position of a fault precursor in a high voltage cable in operation |
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Application publication date: 20140813 |