CN1525186A - Electric line fault location device - Google Patents
Electric line fault location device Download PDFInfo
- Publication number
- CN1525186A CN1525186A CNA031155987A CN03115598A CN1525186A CN 1525186 A CN1525186 A CN 1525186A CN A031155987 A CNA031155987 A CN A031155987A CN 03115598 A CN03115598 A CN 03115598A CN 1525186 A CN1525186 A CN 1525186A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Locating Faults (AREA)
Abstract
The invention a power line failure positioning device applied in light current grounding system, its character: it is composed of voltage sensor, current sensor, signal cable and signal box, there are power supply circuit, failure identification circuit and signal indicating circuit connected with one another, three single-core high voltage cable passes through the center of the current sensor, the secondary-side winding of the voltage sensor is connected to the power supply circuit and the failure identification circuit by the signal cable and that of the current sensor is directly connected to the failure identification by the signal cable. It can accurately not only justify the path of the short-circuit failure current but also the path of single-phase grounding failure current, thus settling the problem of positioning various failure line segments and branch lines.
Description
Affiliated technical field
The present invention relates to a kind of feeder line fault locating device, be meant that especially a kind of small current neutral grounding system determines the device of circuit single-phase earthing section.
Background technology
China 6-60KV electrical network generally adopts the not directly grounded small current neutral grounding system of neutral point, and according to statistics, the failure rate of single-phase earthing is the highest.In the cable joint line based on pole line, because the capacitance current of pole line is very little, the zero-sequence current value during single-phase earthing is also very little.An existing line-failure indicator product sample rate current signal and working value are bigger, generally can only indicate short trouble.And for example disclosed technical scheme has adopted the first half-wave voltage signal of voltage and current to differentiate singlephase earth fault in " supply line's singlephase earth fault display packing and used instrument " (99122276.8), though improved sensitivity, but, yet there are stability and the problem that is subject to disturb owing to be the transient state high-frequency signal.
Summary of the invention
The purpose of this invention is to provide a kind of feeder line fault locating device of judging the line fault section in the small current neutral grounding system that is applicable to, it not only can correctly judge the path of short-circuit current, and can also correctly judge the path of single-phase earth fault current, thereby solved the orientation problem of various faulty line sections and branch line.
Purpose of the present invention can realize by following method: a kind of feeder line fault locating device, it is characterized in that this device is by voltage sensor, current sensor, signal cable and signal box are formed, power circuit is set in the signal box, failure discriminating circuit and signal indicating circuit, power circuit, be connected to each other between failure discriminating circuit and the signal indicating circuit, there are three single-core high-voltage cables to pass the center of current sensor, the secondary side winding of voltage sensor is connected to power circuit and failure discriminating circuit in the signal box by signal cable, and the secondary side winding of current sensor is connected to failure discriminating circuit in the signal box by signal cable.
When in power circuit, using, this device must all be set on all main lines, branch line and branch line, the first side winding of voltage sensor is connected in parallel on the high-tension line, and three single-core high-voltage cables are connected between the high-tension line after passing the center of current sensor.When power circuit generation single-phase earthing, the secondary side winding of all voltage sensors and current sensor produces residual voltage and zero-sequence current respectively on the circuit.Wherein residual voltage is all identical, but the zero-sequence current direction of faulty line and non-fault line then is opposite.Residual voltage, zero-sequence current are connected to failure discriminating circuit in the signal box through signal cable, residual voltage, the zero sequence current signal that faulty circuit will collect stable state carries out after zero sequence direction differentiates, send fault-signal by signal indicating circuit, the load side line ground connection of this device is described; Otherwise circuit does not have ground connection.When power circuit generation phase fault, the secondary side winding of the current sensor on the faulty line produces very big current signal, this electric current enters into the failure discriminating circuit of signal box, send fault-signal by signal indicating circuit after differentiating, illustrating on the load side line of this locating device has phase fault.
Advantage of the present invention is to gather the residual voltage and the zero sequence current signal of stable state and carry out the zero sequence direction discriminating, has improved accuracy and the stability of differentiating earth fault in the small current neutral grounding system; Singlephase earth fault can be determined, phase fault can be determined again.It can be installed in block switch and the front of a wiretap and the junction of leap cable branch line on the power overhead network.It can determine the section and the branch of faulty line quickly and easily, particularly seek the fault of underground cable, lightning arrester puncture, thereby shortened the time of searching greatly, alleviated line inspection working strength of workers, reduce loss of outage, improved the reliability of power supply.
This device also can be used with equipment such as high voltage cable branch boxes.When in same high voltage cable branch box, this device being set, a voltage sensor need only be installed, the first side winding of voltage sensor is connected in parallel on the high-voltage power supply inlet wire, but on each branch cable current sensor must be installed, branch cable passes the single-phase current mutual inductor that current sensor is passed in phase-splitting behind the zero sequence current mutual inductor of current sensor, again by being connected with the high-voltage power supply inlet wire by plug connector.The secondary side winding of voltage sensor and every current sensor is connected to power circuit, failure discriminating circuit and signal indicating circuit through signal cable respectively.
Description of drawings
The invention will be further described below in conjunction with embodiment and accompanying drawing thereof.
Fig. 1 is the wiring diagram of present embodiment (using in power overhead network).
Wherein: 1, voltage sensor, 2, current sensor, 3, single-core high-voltage cable, 4, high-tension line, 5, high-tension line, 6, signal cable, 7, signal cable, 8, signal box, 9, the first side winding of voltage sensor, 10, the secondary side winding of voltage sensor, 11, the secondary side winding of voltage sensor, 12, the single-phase current mutual inductor of current sensor, 13, the zero sequence current mutual inductor of current sensor, 14, power circuit, 15, failure discriminating circuit, 16, signal indicating circuit.
Embodiment
As shown in Figure 1, a kind of feeder line fault locating device, it is characterized in that this device is by voltage sensor 1, current sensor 2, signal cable 6,7 and signal box 8 form, power circuit 14 is set in the signal box 8, failure discriminating circuit 15 and signal indicating circuit 16, power circuit 14, be connected to each other between failure discriminating circuit 15 and the signal indicating circuit 16, three single-core high-voltage cables 3 pass the center of current sensor 2, the secondary side winding 10 of voltage sensor, 11 are connected to power circuit 14 and failure discriminating circuit 15 in the signal box 8 by signal cable 6, and the secondary side winding of current sensor 2 is connected to failure discriminating circuit 15 in the signal box 8 by signal cable 7.
As shown in Figure 1, described voltage sensor (1) is three cores, five rod structures, the first side winding of voltage sensor (9) is Y-connection and is connected in parallel on the high-tension line (4), the secondary side winding of voltage sensor (10) is connected into star as working power, and the secondary side winding of voltage sensor (11) is connected into open-delta provides residual voltage.
As shown in Figure 1, current sensor 2 is made up of the single-phase current mutual inductor 12 of two or three current sensors of punching structure and the zero sequence current mutual inductor 13 of a current sensor, the single-phase current mutual inductor 12 of current sensor provides short-circuit current, and the zero sequence current mutual inductor 13 of current sensor provides zero-sequence current.The single-phase current mutual inductor 12 that current sensor is passed in three single-core high-voltage cable 3 phase-splittings remerges the zero sequence current mutual inductor 13 that passes current sensor and by being in series between high-tension line 4,5.The secondary side winding 10,11 of voltage sensor is connected in the signal box 8 through signal cable 6, and the secondary side winding of voltage sensor 10 is to power circuit 14, for failure discriminating circuit 15 and signal indicating circuit 16 provide power supply; The secondary side winding 11 of voltage sensor is to failure discriminating circuit 15.The secondary side winding of current sensor 2 is connected to failure discriminating circuit 15 in the signal box 8 through signal cable 7.Failure discriminating circuit 15 is connected with signal indicating circuit 16.
When power circuit generation single-phase earthing, the secondary side winding 11 of voltage sensor produces residual voltage 3V0 signal, the zero sequence current mutual inductor 13 of current sensor produces zero-sequence current 3I0, be connected to failure discriminating circuit 15 in the signal box 8 through signal cable 6,7, residual voltage, the zero sequence current signal that 15 pairs of faulty circuits collect stable state carries out after zero sequence direction differentiates, send fault-signal by signal indicating circuit 16, load side line 5 ground connection of this locating device are described.During as circuit generation phase fault, the secondary side winding of the single-phase current mutual inductor 12 of the current sensor on the faulty line produces very big current signal, this electric current enters into the failure discriminating circuit 15 of signal box 8, send fault-signal by signal indicating circuit 16 after differentiating, illustrating on the load side line 5 of this locating device has phase fault.
Claims (3)
1, a kind of feeder line fault locating device, it is characterized in that: this device is by voltage sensor (1), current sensor (2), signal cable (6,7) and signal box (8) form, power circuit (14) is set in the signal box (8), failure discriminating circuit (15) and signal indicating circuit (16), power circuit (14), be connected to each other between failure discriminating circuit (15) and the signal indicating circuit (16), three single-core high-voltage cables (3) pass the center of current sensor (2), the secondary side winding (10 of voltage sensor, 11) be connected to power circuit (14) and failure discriminating circuit (15) in the signal box (8) by signal cable (6), the secondary side winding of current sensor (2) is connected to failure discriminating circuit (15) in the signal box (8) by signal cable (7).
2, according to right 1 described a kind of feeder line fault locating device, it is characterized in that: described voltage sensor (1) is three cores, five rod structures, the first side winding of voltage sensor (9) is Y-connection, the secondary side winding of voltage sensor (10) is connected into star, and the secondary side winding of voltage sensor (11) is connected into open-delta.
3, according to right 1 described a kind of feeder line fault locating device, it is characterized in that: described current sensor (2) is made up of the single-phase current mutual inductor (1) of two or three current sensors of punching structure and the zero sequence current mutual inductor (13) of a current sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031155987A CN1525186A (en) | 2003-02-28 | 2003-02-28 | Electric line fault location device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031155987A CN1525186A (en) | 2003-02-28 | 2003-02-28 | Electric line fault location device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1525186A true CN1525186A (en) | 2004-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031155987A Pending CN1525186A (en) | 2003-02-28 | 2003-02-28 | Electric line fault location device |
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| CN (1) | CN1525186A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882783A (en) * | 2010-04-28 | 2010-11-10 | 湖北省电力公司咸宁供电公司 | Method for reducing fault processing time of current grounding system in 10kV voltage class |
| CN102590695A (en) * | 2012-03-08 | 2012-07-18 | 南京理工大学常熟研究院有限公司 | Device for detecting and locating failure of power line |
| CN103245818A (en) * | 2013-04-15 | 2013-08-14 | 国家电网公司 | Method for measuring voltage at single-phase earth fault point of power transmission line |
| CN103983885A (en) * | 2014-05-05 | 2014-08-13 | 国电南瑞科技股份有限公司 | Low-voltage circuit fault locating terminal and method used for power distribution substation region |
| CN104471412A (en) * | 2012-07-20 | 2015-03-25 | 伊顿公司 | Method and apparatus of identifying or locating current sensors |
| CN104471413A (en) * | 2012-07-20 | 2015-03-25 | 伊顿公司 | Method and device for positioning current sensor |
| CN106291212A (en) * | 2015-05-29 | 2017-01-04 | 梁克标 | A kind of Novel fault indicator |
| CN106597197A (en) * | 2016-12-09 | 2017-04-26 | 国网江苏省电力公司苏州供电公司 | Method and apparatus for positioning short circuit of crossed and interconnected structure of high-voltage single-core cable |
-
2003
- 2003-02-28 CN CNA031155987A patent/CN1525186A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882783A (en) * | 2010-04-28 | 2010-11-10 | 湖北省电力公司咸宁供电公司 | Method for reducing fault processing time of current grounding system in 10kV voltage class |
| CN101882783B (en) * | 2010-04-28 | 2012-09-19 | 湖北省电力公司咸宁供电公司 | Method for reducing fault processing time of current grounding system in 10kV voltage class |
| CN102590695A (en) * | 2012-03-08 | 2012-07-18 | 南京理工大学常熟研究院有限公司 | Device for detecting and locating failure of power line |
| CN104471412A (en) * | 2012-07-20 | 2015-03-25 | 伊顿公司 | Method and apparatus of identifying or locating current sensors |
| CN104471413A (en) * | 2012-07-20 | 2015-03-25 | 伊顿公司 | Method and device for positioning current sensor |
| CN104471412B (en) * | 2012-07-20 | 2018-11-09 | 伊顿公司 | The method and apparatus of identification or location current sensor |
| CN104471413B (en) * | 2012-07-20 | 2018-11-09 | 伊顿公司 | The method and apparatus of location current sensor |
| CN103245818A (en) * | 2013-04-15 | 2013-08-14 | 国家电网公司 | Method for measuring voltage at single-phase earth fault point of power transmission line |
| CN103245818B (en) * | 2013-04-15 | 2015-08-05 | 国家电网公司 | Transmission line one-phase earth fault point voltage measuring method |
| CN103983885A (en) * | 2014-05-05 | 2014-08-13 | 国电南瑞科技股份有限公司 | Low-voltage circuit fault locating terminal and method used for power distribution substation region |
| CN106291212A (en) * | 2015-05-29 | 2017-01-04 | 梁克标 | A kind of Novel fault indicator |
| CN106597197A (en) * | 2016-12-09 | 2017-04-26 | 国网江苏省电力公司苏州供电公司 | Method and apparatus for positioning short circuit of crossed and interconnected structure of high-voltage single-core cable |
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| C06 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |