CN103018631A - System for 10kV fault line detection - Google Patents
System for 10kV fault line detection Download PDFInfo
- Publication number
- CN103018631A CN103018631A CN2012105090734A CN201210509073A CN103018631A CN 103018631 A CN103018631 A CN 103018631A CN 2012105090734 A CN2012105090734 A CN 2012105090734A CN 201210509073 A CN201210509073 A CN 201210509073A CN 103018631 A CN103018631 A CN 103018631A
- Authority
- CN
- China
- Prior art keywords
- phase
- far
- remote control
- control device
- end remote
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a system for 10kV fault line detection and belongs to the field of fault detection and relay protection of electric systems. The system comprises a 10KV bus and a far-end remote control device, wherein the bus comprises a phase A, a phase B and a phase C, the phase A and the phase C at the far end of the bus are connected with an input end of the far-end remote control device, and an output end of the far-end remote control device is grounded. By the aid of the system for fault line detection, single-phase grounding fault lines in a high-voltage power grid can be judged quickly and accurately, quick disconnection can be achieved, and the influence on a power grid system can be avoided.
Description
Technical field
The present invention relates to a kind of small current neutral grounding system mesohigh electric network single-phase earth fault detection system, belong 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 the three-phase still keeps symmetrical, on not impact of supply load, so rules allow to continue operation 1～2h.But in the actual motion may since superpotential cause power cable blast, TV fuse melting in addition burn out, the accident 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 by push-and-pull the further judgement of the test method ability faulty line of electrical network, has 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 employed general Small Electric Current Earthing And Routing Device at present:
(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.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of 10kV earthing wire-selecting system, and this system can judge singlephase earth fault circuit in the high-voltage fence rapidly and accurately, and realizes disconnecting fast, avoids network system is impacted.
For solving the problems of the technologies described above, the technical solution used in the present invention 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 links to each other the output head grounding of far-end remote control device with C with the input end 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, between bus and far-end remote control device, be in series with the amperometry device.
The beneficial effect that adopts technique scheme to produce is: the present invention 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 is grasped system earth utmost point arc suppression coil compensation situation fast, improves the security of electrical network.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is circuit diagram of the present invention;
Wherein: 1, far-end remote control device, 2, resistance device, 3, bus, 4, the amperometry device.
Embodiment
The present invention 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 links to each other 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 the non-fault that deciliter make by switch.
The below the present invention 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 are 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 invention:
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 the resistance in series device ground connection, make it within 2 seconds, want automatic cutout in order to avoid network system is impacted;
3, the three-phase star-star connection is adopted in the protection loop in the transformer station, so that centering line out-of-balance current is sampled.
The present invention is installed in 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 in the 10kV network system, be promoted.
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 links to each other the output head grounding of far-end remote control device (1) with the input end of C phase with 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 |
|---|---|---|---|
| CN2012105090734A CN103018631A (en) | 2012-12-04 | 2012-12-04 | System for 10kV fault line detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105090734A CN103018631A (en) | 2012-12-04 | 2012-12-04 | System for 10kV fault line detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103018631A true CN103018631A (en) | 2013-04-03 |
Family
ID=47967458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105090734A Pending CN103018631A (en) | 2012-12-04 | 2012-12-04 | System for 10kV fault line detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103018631A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061481A (en) * | 2019-03-28 | 2019-07-26 | 李晓明 | A kind of zero-sequence voltage injection method and device |
| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
| CN113093060A (en) * | 2021-04-13 | 2021-07-09 | 厦门理工学院 | Method, device and equipment for detecting zero line breakage of power distribution network |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1901314A (en) * | 2006-07-21 | 2007-01-24 | 重庆大学 | Fault line selecting method for distribution system single phase earthing |
| CN200953470Y (en) * | 2006-10-10 | 2007-09-26 | 杜志庭 | Small current grounding wire selecting device for neutral point non-effective ground connection system |
| JP2010161850A (en) * | 2009-01-07 | 2010-07-22 | Chugoku Electric Power Co Inc:The | Minute grounding section locating system |
| CN102645617A (en) * | 2011-12-13 | 2012-08-22 | 北京泽源惠通科技发展有限公司 | Method for detecting single-phase grounding faults of low current grounding system |
| CN102788936A (en) * | 2012-09-03 | 2012-11-21 | 安徽理工大学 | Low current grounding fault circuit selection method |
| CN102798795A (en) * | 2012-08-14 | 2012-11-28 | 大连电力勘察设计院有限公司 | Method capable of realizing low-current route selection and fault location |
| CN202929158U (en) * | 2012-12-04 | 2013-05-08 | 保定供电公司 | 10KV grounding line selection system |
-
2012
- 2012-12-04 CN CN2012105090734A patent/CN103018631A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1901314A (en) * | 2006-07-21 | 2007-01-24 | 重庆大学 | Fault line selecting method for distribution system single phase earthing |
| CN200953470Y (en) * | 2006-10-10 | 2007-09-26 | 杜志庭 | Small current grounding wire selecting device for neutral point non-effective ground connection system |
| JP2010161850A (en) * | 2009-01-07 | 2010-07-22 | Chugoku Electric Power Co Inc:The | Minute grounding section locating system |
| CN102645617A (en) * | 2011-12-13 | 2012-08-22 | 北京泽源惠通科技发展有限公司 | Method for detecting single-phase grounding faults of low current grounding system |
| CN102798795A (en) * | 2012-08-14 | 2012-11-28 | 大连电力勘察设计院有限公司 | Method capable of realizing low-current route selection and fault location |
| CN102788936A (en) * | 2012-09-03 | 2012-11-21 | 安徽理工大学 | Low current grounding fault circuit selection method |
| CN202929158U (en) * | 2012-12-04 | 2013-05-08 | 保定供电公司 | 10KV grounding line selection system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061481A (en) * | 2019-03-28 | 2019-07-26 | 李晓明 | A kind of zero-sequence voltage injection method and device |
| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
| CN113093060A (en) * | 2021-04-13 | 2021-07-09 | 厦门理工学院 | Method, device and equipment for detecting zero line breakage of power distribution network |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10910826B2 (en) | Voltage derivative and zero-sequence broken conductor detection | |
| EP3216644B1 (en) | Distributed protection system for power supply at sections of electrified railway propulsion system | |
| EP2128951B1 (en) | Electronic active earthing system for use in high-voltage distribution networks | |
| CN103606909A (en) | Protecting system and method for power distribution network circuit | |
| CN103267928B (en) | Low-current system single-phase earth fault line selection control circuit | |
| CN205544206U (en) | Intelligence PT harmonic elimination selects device of looks | |
| CN110605999B (en) | Measurement and control protection system and method for through type in-phase power supply network | |
| CN102969695B (en) | Grounding forecasting method in neutral-point low-resistance grounding mode | |
| CN214412259U (en) | IT power supply system earth leakage protection device | |
| CN207638333U (en) | Alternating current filter cuts off circuit automatically after a kind of last line tripping | |
| CN201859161U (en) | Asymmetric current source | |
| CN103018631A (en) | System for 10kV fault line detection | |
| CN105807187A (en) | Single-phase ground-fault assist detection device | |
| CN202929158U (en) | 10KV grounding line selection system | |
| RU2638574C1 (en) | Medium voltage substation | |
| CN205786965U (en) | The device of a kind of electric power system power generation circuit earthing wire-selecting and comprehensive protector | |
| CN104113049A (en) | Single-phase grounding fault self-recovery system | |
| CN209946345U (en) | Intelligent pole-mounted circuit breaker with primary and secondary integration and cable monitoring system | |
| Shen et al. | Grounding transformer application, modeling, and simulation | |
| CN105510731A (en) | Parallel resonance detection alarming method and system for medium-voltage side power grid of power transformer | |
| CN202837471U (en) | Low-current grounding system single-phase earth fault wire discrimination device | |
| CN206977030U (en) | A kind of alternating current generator residual current protection circuit | |
| CN112180894A (en) | Electric performance detection device for pole-mounted circuit breaker controller | |
| CN105116352B (en) | The double set DC power system string electro-detection methods of substation | |
| CN109004531A (en) | A kind of neutral resistance complexes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: BAODING POWER SUPPLY COMPANY Effective date: 20131018 Owner name: STATE GRID HEBEI ELECTRIC POWER COMPANY BAODING PO Effective date: 20131018 |
|
| 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 |
|
| TA01 | Transfer of patent application right |
Effective date of registration: 20131018 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: State Grid Hebei Electric Power Company Applicant after: Baoding Power Supply Branch Company, State Grid Hebei Electric Power Company Address before: 071000 No. 138 sunny north street, Hebei, Baoding Applicant before: Baoding Power Supply Company |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130403 |