CN202929158U - 10KV grounding line selection system - Google Patents
10KV grounding line selection system Download PDFInfo
- Publication number
- CN202929158U CN202929158U CN2012206555927U CN201220655592U CN202929158U CN 202929158 U CN202929158 U CN 202929158U CN 2012206555927 U CN2012206555927 U CN 2012206555927U CN 201220655592 U CN201220655592 U CN 201220655592U CN 202929158 U CN202929158 U CN 202929158U
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- remote control
- end remote
- bus
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- 238000004082 amperometric method Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000007935 neutral effect Effects 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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
Abstract
Disclosed is a 10KV grounding line selection system, belonging to the electric power system fault detection and relay protection field. The 10KV grounding line selection system comprises a 10KV bus and a far-end remote control unit, wherein the bus comprises phase A, phase B, and phase C; the far-end phase A and phase C of the bus is connected with an input terminal of the far-end remote control unit; and the output terminal of the far-end remote control unit is grounded. The 10KV grounding line selection system of the utility model is capable of rapidly and accurately judging the single-phase earth fault line in the high voltage electrical network and realizing rapid disconnection and accordingly avoiding the influence upon the electrical network system.
Description
Technical field
The utility model relates to a kind of small current neutral grounding system mesohigh electric network single-phase earth fault detection system, belongs to Power System Faults Detection and relay protection field, especially a kind of 10kV earthing wire-selecting system.
Background technology
In China 35kV and 10kV electric system, the neutral point of transformer adopts non_direct ground mode (being small grounding current system) more, when circuit generation singlephase earth fault, the numerical value of fault current is often than little many of load current, fault phase voltage reduces to zero, and healthy phases voltage raises and is the several times of phase voltage, but the line voltage between three-phase still keeps symmetrical, on not impact of supply load, so rules allow to continue operation 1～2h.But may even burn out because superpotential causes power cable blast, TV fuse melting in actual motion, the accidents such as busbar short-circuit.
Occur for fear of the problems referred to above, detect fast and accurately the faulty line of single-phase earthing, usually utilize general route selection principle that faulty line is judged.General route selection principle has: the ⑴ insulating monitor.The insulating monitor utilization is connected to the three-phase five-pole voltage transformer of public bus, and its primary winding all is connected into star, and additional secondary coil is connected into open-delta.The secondary coil that is connected into star is supplied with voltage table, protection and the measurement instrument that insulating monitoring is used.The secondary coil that is connected into open-delta is supplied with the insulating monitoring relay.When system was normal, three-phase voltage was normal, and the three-phase voltage sum is zero, and the secondary coil voltage of open-delta is zero, and the insulating monitoring relay is failure to actuate.When singlephase earth fault occured, residual voltage appearred in the secondary terminals of open-delta, and voltage relay moves, and sent the anticipating signal of system earth fault.Its advantage is that investment is little, and wiring is simple, operation and easy to maintenance.Its shortcoming is that the nothing of only sending system earth is selected anticipating signal, can not accurately judge the faulty line that ground connection occurs, and the operations staff need to be cut apart the further judgement of the test method ability faulty line of electrical network by push-and-pull, affected the continuous power supply of non-fault line; ⑵ zero-sequence current principle.When in the electrical network of isolated neutral, singlephase earth fault occuring, the size of non-fault line zero-sequence current equals the earthing capacitance current of this circuit.The size of faulty line zero-sequence current equals the zero-sequence current sum of all non-fault lines, namely the earthing capacitance current sum of all non-fault lines.Usually the zero-sequence current of faulty line is more much bigger than non-fault line zero-sequence current, utilizes this principle, can adopt current element to distinguish earth fault line; ⑶ homopolar power principle.In when, in the electrical network of isolated neutral, singlephase earth fault occuring, 90 ° of the leading residual voltages of the zero-sequence current of non-fault line, 90 ° of the zero-sequence current hysteresis residual voltages of faulty line, 180 ° of the zero-sequence current phase phasic differences of the zero-sequence current of faulty line and non-fault line.According to this principle, can utilize zero-sequence direction component to distinguish earth fault line.
Yet all there are the following problems for the present general Small Electric Current Earthing And Routing Device that uses:
(1) semaphore as criterion is little, and relative measurement error is bigger than normal;
(2) error of zero sequence PT, CT and length cause measuring error apart from secondary cable;
(3) interference is large, signal to noise ratio (S/N ratio) is little; The one, electromagnetic interference (EMI), the 2nd, zero-sequence current and harmonic current that the system loading imbalance causes are larger;
(4) the enchancement factor impact is uncertain.
Above situation causes the route selection accuracy rate on the low side, and practical effect is not good.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of 10kV earthing wire-selecting system, and this system can judge singlephase earth fault circuit in high-voltage fence rapidly and accurately, and realizes disconnecting fast, avoids network system is impacted.
For solving the problems of the technologies described above, technical solution adopted in the utility model is: a kind of 10kV earthing wire-selecting system, it is characterized in that this system comprises bus, the far-end remote control device of 10KV, described bus comprises A, B, C three-phase, the A phase of its median generatrix far-end is connected with the input end of far-end remote control device with C, the output head grounding of far-end remote control device.
Preferably, described far-end remote control device inside is provided with the resistance device that is in series with described A phase and C.
Preferably, be in series with the amperometry device between bus and far-end remote control device.
The beneficial effect that adopts technique scheme to produce is: the utility model utilizes the far-end remote control device that earth fault line is judged, it is highly sensitive, route selection is accurate, accurately the identification ground loop, grasp system earth utmost point arc suppression coil compensation situation fast, improves the security of electrical network.
Description of drawings
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is circuit diagram of the present utility model;
Wherein: 1, far-end remote control device, 2, resistance device, 3, bus, 4, the amperometry device.
Embodiment
The utility model is specifically related to a kind of 10kV earthing wire-selecting system, being used for small current neutral grounding system mesohigh electric network single-phase earth fault detects, this system comprises bus 3, the far-end remote control device 1 of 10KV, described bus 3 comprises A, B, C three-phase, the A phase of its median generatrix 3 far-ends is connected with the input end of far-end remote control device 1 with C, the output head grounding of far-end remote control device 1, wherein far-end remote control device 1 inside is provided with the resistance device 2 that is in series with described A phase and C, is in series with the amperometry device between bus 3 and far-end remote control device 1.
In this system, far-end remote control device 1, its function is that dispatching office passes through Interface of Computer, sends the divide-shut brake instruction to ground connection transformer station, deciliter local grounding switch after the ground connection instruction is received by the transformer station of ground connection, makes A phase or C phase voltage through transition resistance device ground connection.The function of amperometry device 4 is for carrying out imbalance relatively to each road outlet neutral current, its maximal value corresponding line is fault (ground connection) circuit, and the ground path information of confirming is uploaded dispatching terminal.The resistance device 2 of series connection, its function is resistance generation or the disappearance out-of-balance current of connecting between fault phase and non-fault that deciliter make by switch.
Following the utility model in actual use situation be described.As shown in Figure 1, certain station 10kV bus, it is with 511,512,513,514 totally 4 tunnel outlets, to there be ground signalling to reach dispatching office this moment if ground connection occurs 511 circuit d points, this moment, dispatching office can utilize far-end remote control device 1 that switch kc in the resistance device 2 of series connection is closed a floodgate, this moment, the 10kV A of the system phase C current-limiting resistance of having connected between mutually, produced electric current I
AC, so 511 outlet neutral current I
0511=I
511C+ I
511B+ I
511A+ I
AC=I
ACBecause only there is normal load current in All other routes (512,513,514), therefore can not produce larger out-of-balance current, as long as therefore utilize amperometry device 4 relatively each outlet neutral current can judge ground path.
The below is described further use of the present utility model:
1, resistance in series is connected to respectively A phase, C phase, closes the C phase when A phase ground connection, and B phase ground connection can be closed A phase or C phase, and C phase ground connection is closed the A phase;
2, after resistance in series device ground connection, make it want automatic cutout in order to avoid network system is impacted within 2 seconds;
3, in transformer station, the three-phase star-star connection is adopted in the protection loop, so that centering line out-of-balance current is sampled.
The utility model is arranged on a certain transformer station, artificially carry out ground connection at the 10kV circuit, then use this system to judge, if correctly reflect the actual conditions of line-to-ground, and can not impact and destroy network system, can think this project success, and be promoted in the 10kV network system.
Claims (3)
1. 10kV earthing wire-selecting system, it is characterized in that this system comprises bus (3), the far-end remote control device (1) of 10KV, described bus (3) comprises A, B, C three-phase, the A phase of its median generatrix (3) far-end is connected with the input end of C phase with far-end remote control device (1), the output head grounding of far-end remote control device (1).
2. 10kV earthing wire-selecting according to claim 1 system is characterized in that described far-end remote control device (1) inside is provided with the resistance device (2) that is in series with described A phase and C.
3. 10kV earthing wire-selecting according to claim 1 system, is characterized in that being in series with the amperometry device between bus (3) and far-end remote control device (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206555927U CN202929158U (en) | 2012-12-04 | 2012-12-04 | 10KV grounding line selection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206555927U CN202929158U (en) | 2012-12-04 | 2012-12-04 | 10KV grounding line selection system |
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| Publication Number | Publication Date |
|---|---|
| CN202929158U true CN202929158U (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012206555927U Expired - Fee Related CN202929158U (en) | 2012-12-04 | 2012-12-04 | 10KV grounding line selection system |
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| Country | Link |
|---|---|
| CN (1) | CN202929158U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018631A (en) * | 2012-12-04 | 2013-04-03 | 保定供电公司 | System for 10kV fault line detection |
-
2012
- 2012-12-04 CN CN2012206555927U patent/CN202929158U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018631A (en) * | 2012-12-04 | 2013-04-03 | 保定供电公司 | System for 10kV fault line detection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID HEBEI ELECTRIC POWER COMPANY BAODING PO Effective date: 20131021 Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: BAODING POWER SUPPLY COMPANY Effective date: 20131021 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 071000 BAODING, HEBEI PROVINCE TO: 100031 XICHENG, BEIJING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20131021 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: State Grid Hebei Electric Power Company Patentee after: Baoding Power Supply Branch Company, State Grid Hebei Electric Power Company Address before: 071000 No. 138 sunny north street, Hebei, Baoding Patentee before: Baoding Power Supply Company |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130508 Termination date: 20171204 |