CN201805221U - Automatic isolating and positioning device for ground fault of direct current system - Google Patents
Automatic isolating and positioning device for ground fault of direct current system Download PDFInfo
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- CN201805221U CN201805221U CN2010202620006U CN201020262000U CN201805221U CN 201805221 U CN201805221 U CN 201805221U CN 2010202620006 U CN2010202620006 U CN 2010202620006U CN 201020262000 U CN201020262000 U CN 201020262000U CN 201805221 U CN201805221 U CN 201805221U
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Abstract
An automatic isolating and positioning device for ground fault of a direct current system overcomes the defects that the traditional device only can monitor a specific ground circuit or a branch grounded by a direct current circuit and can not isolate a fault circuit from the direct current system, thereby influencing safe operation of a normal circuit caused by the defective fault circuit. The utility model adopts a method and a device for supplying power for a power consumption unit by utilizing mutually independent double direct current power supplies and switching the fault branch power consumption unit from a common power supply and an isolated power supply for power supply; each branch is provided with an online insulation monitoring device; a communication module is connected with the insulation monitoring device; an output signal is sent to an upper PC computer; the upper PC computer is used for controlling each branch to sequentially isolate and search fault points, receiving, preserving and comprehensively analyzing the data monitored by each branch, reporting ground faults to the direct current system and displaying serial numbers of the ground circuit and ground points of the ground circuit in each branch.
Description
Technical field
The utility model relates to a kind of to the automatic also positioner of isolating of transformer station direct current system earth fault, belongs to electric power system power station equipment operation and maintenance technical field.
Background technology
Direct current system provides DC power supply for control, signal, relaying protection, automatics and emergency lighting etc. in the transformer station; it also provides reliable operating power for operation; direct current system reliably whether; to the important role in safe operation of transformer station, be the assurance of substation safety operation.Because direct current system has a very wide distribution in transformer station, exposed parts is many, cable is many and longer, so be easy to be subjected to the corrosion of dust, moisture, some weak element insulating that insulate is reduced, even insulation breakdown causes DC earthing, and the reason of analyzing DC earthing generally has following several aspect:
1, the secondary circuit insulating material is defective, insulation property are low, or long neglected and in disrepair, serious aging, or has some damage defect etc.;
2, secondary circuit and equipment pollution severity and make moist, ground connection box water inlet, the direct current insulation against ground is seriously descended;
3, toy climbs into or little metal parts drops cause DC ground fault on element.
The main presentation of dc system fault is indirect ground connection or nonmetal character ground connection; under the ground fault condition that non-artificial factor causes; its failure cause mostly is the variable effect that is subjected to weather and equipment operating environment; some are also arranged is the dynamic type earth fault that is difficult to search; DC system earth fault; not only unfavorable to equipment; and the safety of whole electric power system constituted a threat to; when the multipoint earthing fault particularly takes place; serious consequence may be caused,, just ground short circuit may be constituted if 2 earth faults take place; cause relaying protection; signal; automatics malfunction or tripping; or cause dc insurance fusing, make protection and automatics; control loop loses power supply, 2 ground connection of homopolarity in the protection loop of complexity; also may be with some relay short circuit, akinesia is in tripping operation; cause overstep tripping.
When the main method of pre-treatment DC system earth fault has:
1, draw loop method: this is that the simple approach that DC ground fault is continued to use is always looked in electric power system.Cut off the DC power supply in this loop exactly, interruption duration should be less than three seconds.General earlier from signal circuit, lighting loop, operation circuit is protected loop or the like again.This kind method; because electrical secondary system becomes increasingly complex; most factory station is because the variety of problems of leaving in construction or the enlarging; make the differentiation of signal circuit and control loop and the protection strictness in loop; and more also form some improper closed loops, must increase and retracted the difficulty that earth fault is searched on the road.Just because circuit connection exists uncertain; often make in retracting the process on road; artificial tripping operation accident usually takes place; add the extensive application of Microcomputer Protection; Microcomputer Protection is not because the operation characteristic of computer allows random outage yet; " retract the road " and may cause control loop and protection loop major accident to take place, forbidden adopting this method in some areas.
2, DC earthing on-line equipment monitoring method
This is a kind of device of on-line monitoring direct current system insulation against ground situation.The advantage of this device is the energy on-line monitoring; at any time report DC system earth fault; and demonstrate grounded circuit numbering; shortcoming is concrete grounded circuit or the branch road that this device can only be monitored DC loop ground connection; but can't locate concrete earth point; fault loop can not be isolated from direct current system; in order to avoid have influence on the safe operation in normal loop owing to fault loop goes to work braving one's illness, as utility model patent " DC system earth fault positioner " (application number: 200920049883.X) with " distributed insulating monitoring in the direct current system and the automatic position indicator of earth fault " (application number: 01240164.1).
3, Portable DC earth fault positioning device fault location method
This device is to begin in recent years at the electric power system product of extensive use comparatively.This apparatus features is to need not to disconnect the DC loop power supply, can chargedly search the method that DC ground fault can avoid using " retracting the road " fully again, has greatly improved the fail safe of searching DC ground fault.And this device can navigate to earth fault concrete point, be convenient to operation, its shortcoming is need manually carry this to install one by one that circuit detects, the same with the defective described in the method 2, fault loop can not be isolated from direct current system, as utility model patent " Portable DC system earth malfunction detector " (application number: 200520019966.6).
Summary of the invention
The utility model purpose is can not isolate or can't localization method and the defective of device at existing processing DC system earth fault, proposing a kind of transformer station direct current system earth fault isolates and positioner automatically, under situation about not having a power failure, fault branch is isolated from direct current system, guarantee that non-fault loop is avoided disturbing and normal operation, each branch road of online in real time itinerant monitor system, realize the location of multiple faults point, described device is made up of insulating power supply, insulation monitoring and warning device, switching control, communication module and upper PC; On each direct current power unit branch road the D.C. isolation monitoring device is installed, communication module is connected with this branch road insulation monitoring and warning device, its output signal line is connected with upper PC through bus system, switching control also has output control line to receive the driving output unit, receives the relay switching device through the transistor switch element again.Upper PC can be isolated in order by the on-Line Monitor Device of total each branch road of line traffic control and searched the fault point, the Monitoring Data that can receive and preserve each branch road, the data of each branch road of analysis-by-synthesis, at any time report DC system earth fault, and demonstrate grounded circuit numbering and the earth point in branch road.
The technical solution of the utility model is:
DC system earth fault is isolated and positioner automatically, form by insulating power supply, insulation monitoring and warning device, switching control, communication module and upper PC, insulation monitoring and warning device is the on-line real time monitoring device that is installed on each bar branch road, communication module and insulation monitoring and warning device link, and will detect information and upper PC carries out data communication; Upper PC has data to preserve and failure analysis module, can control the power supply of coordinating each branch road switches, can receive, preserve the data that each branch road on-Line Monitor Device transmits, and carry out accident analysis according to these data and locate, demonstrate grounded circuit numbering and the earth fault in branch road, it is characterized in that: described insulating power supply is DC power supply independently, and power supply is a wire laying mode, can also be mobile portable.
Aforesaid DC system earth fault is isolated and positioner automatically, and it is characterized in that: described switching control is the steady switching device shifter of continuous level, and its beneficial effect is: under the prerequisite of not cutting off the power supply, realize the isolation of this branch road and former direct current system.
Aforesaid DC system earth fault is isolated and positioner automatically, it is characterized in that: can also in every branch road, segmentation seal in diverter switch, be in each branch road, have more than more than one diverter switch each power unit of this branch road is connected in series, its beneficial effect is: when detecting this branch trouble, switching control until detecting the fault point, can segmentation more accurately detect the segmentation isolation one by one of this branch road and accurate fault location point in this branch road.
Operation principle of the present utility model is:
When 1, normally monitoring, each branch road monitoring device works alone, the leakage current of each section of this branch road of detection by quantitative, and information mail to upper PC.
2, each branch road information of upper PC receiving and analyzing is also monitored simultaneously the voltage to earth of whole direct current system, notes abnormalities or when finding that earth fault appears in a certain branch road or a plurality of branch road, switches by power supply, in order the isolation branch road that may break down.
When 3, breaking down, a certain branch road switched to insulating power supply after, the signal that this branch road monitors normally shows this branch road fault-free.
When 4, breaking down, a certain branch road switched to insulating power supply after, whole direct current system is recovered to show that normally this branch road is unique fault branch.Otherwise show that direct current system also exists other fault branches or fault point.
When 5, breaking down, each branch road switches to insulating power supply successively, and the signal that monitors during each simultaneously the isolation is all normal.Show that major loop has fault in the direct current cabinet but whole direct current system work is undesired.
6, adopt compact power,, the power supply switching point be set the further segmentation of branch road, in like manner the fault point can be locked in this branch road more among a small circle.
The beneficial effects of the utility model are:
1, this device can realize rapidly, automatically that fault branch and normal branch road isolate fully; reduce the time that fault loop is led the way; dwindled the DC earthing that hinders branch road for some reason and exerted an influence, and the protection malfunction that may bring and the scope of tripping, this also is that all detection methods were incomparable in the past.
2, this device to many branch roads simultaneously the fault of ground connection good investigation and isolating power are arranged, can solve for many years conventional method to a multipoint earthing malfunction elimination difficult technologies difficult problem.
3, can effectively quantitative detection to the ground connection of nonmetal character as the degradation fault that insulate down, highly sensitive.
4, can automatic inspection under the situation that does not retract the road, mode of operation safety, simple and direct, easy access and operations staff's grasp.
5, can transform existing direct current system, widely applicable.
Description of drawings
Fig. 1 is the arbitrary branch road switching principle of the utility model embodiment figure;
Fig. 2 is power supply switching controls circuit theory figure;
Fig. 3 is switching controls and drive principle figure.
Embodiment
Mark in the accompanying drawing, in the accompanying drawing 1, K11, K21, Kn1---power supply commonly used inserts the 1st, the 2nd and n bar branch road control relay normally-closed contact, and K12, K22, Kn2---insulating power supply inserts the 1st, the 2nd control relay normally opened contact to n bar branch road; In the accompanying drawing 2, Ki0---relay coil and normally-closed contact thereof, Ki1, Ki2---i (i=1,2 ... n) bar branch road relay coil and normally opened contact, Ki3, Ki4---i bar branch road relay normally open or normally-closed contact, SBi1, SBi2---i bar branch road manual switchover push-button switch, STi1, STi2---i bar branch road time-delay relay and contact thereof, KM+---control positive source, KM----control power cathode; In the accompanying drawing 3, Vcc-controls power supply, Ki3, Ki4---the relay coil on the i bar branch road, Qi1, Qi2---transistor switch element on the i bar branch road, Pix1y1, Pix2y2---i bar branch road drive output signal.
Below in conjunction with accompanying drawing the utility model embodiment is further specified:
As accompanying drawing, each bar direct current branch configuration is identical, and configuration on-line insulation monitoring device, power transfer device and communication module also has the bus with upper PC communication in every direct current branch.With the 1st branch road is example, the K11 contact is normally closed under the normal condition, K12 is for often opening, this route power supply power supply commonly used, when detecting this branch road, insulation monitoring and warning device breaks down, promptly pass through communication module, bus is sent fault-signal to upper PC, after the upper PC analytical calculation, send switching command, switching controls module drive P1x1Y1, Q11 connects, the K13 coil is got, K12 relay coil and time-delay relay coil ST12 are simultaneously, connect two and often open contact point K12, insulating power supply and this branch road are connected, and power supply at this moment commonly used and insulating power supply are simultaneously to the power supply of this branch road power unit, after time-delay relay normally opened contact ST12 time-delay connection is left, the K11 coil gets, its normally-closed contact K11 disconnects, and power supply commonly used and branch road disconnect, and this route insulating power supply is powered separately, this fault branch will show on upper PC, remind operating personnel to handle, after treated fault was got rid of, the on-line insulation monitoring device detected this branch trouble and gets rid of, upper PC sends instruction, by switching controls module drive P1x2Y2, Q12 connects, and the K14 coil is got.The coil of relay coil K10 and time-delay relay ST11 simultaneously electric, normally closed contact point K10 disconnects, relay coil K11 outage, normally-closed contact K11 connects power supply commonly used, this moment, power supply commonly used was powered to this branch road power unit with the insulating power supply while; When the coil of time-delay relay ST11 gets, when its normally-closed contact ST11 time-delay disconnects, the coil of time-delay relay ST12 and relay K 22 coils cut off the power supply simultaneously, controlling its contact ST12 time-delay disconnects, lock up relay K11 no longer, the contact of K22 in branch road disconnects simultaneously, and insulating power supply withdraws from power supply.
Other branch road operating principle is the same, and upper PC is controlled each branch road insulating monitoring module, and the switching of each branch road is coordinated in unified management, and synchronization only allows a branch road to switch.
DC power supply Vcc is power supply power supply commonly used.
Power supply manually commonly used switches to insulating power supply:
Earlier manually press SB12 and unclamp, the K12 relay coil gets electric, connects two and often opens contact point K12, and insulating power supply and branch road are connected.While time-delay relay coil ST12 gets electric, controls its normally opened contact ST12 time-delay connection and opens, and the K11 coil gets electric, and its normally-closed contact K11 disconnects, power supply commonly used and branch road disconnection.
Manually insulating power supply switches to power supply commonly used:
Manually press SB11 and unclamp, relay coil K10 gets electric, and normally closed contact point K10 disconnects, relay coil K11 outage, and normally-closed contact K11 connects power supply commonly used.Simultaneously, the coil of time-delay relay ST11 gets electric its normally-closed contact ST11 and disconnects, and the coil blackout of time-delay relay ST12 is controlled its contact ST12 time-delay and disconnected.Make the relay K 11 can not be again.
During manual power switch operating state, upper PC is controlled all switching controls modules and is not driven output function, in order to avoid cause misoperation.
Under the control of upper PC control, finish at every turn once switch after, whole system is carried out DC grounding monitor, accident analysis.
According to above-mentioned operation principle of the present utility model, carry out real-time circulatory monitoring, the data that upper PC software is sent according to each monitoring module just can clearly analyze the fault point of system.
After single branch road seals in more than one disjunction diverter switch group, upper PC is when receiving this branch road and break down, the diverter switch of controlling this branch road successively disconnects or closure, and until finding out the faulty section between two diverter switches of this branch road and being presented on the upper PC, its operating principle is the same.
Claims (3)
1. DC system earth fault is isolated and positioner automatically, form by insulating power supply, insulation monitoring and warning device, switching control, communication module and upper PC, insulation monitoring and warning device is the on-line real time monitoring device that is installed on each bar branch road, communication module and insulation monitoring and warning device link, and will detect information and upper PC carries out data communication; Upper PC has data to preserve and failure analysis module, can control the power supply of coordinating each branch road switches, can receive, preserve the data that each branch road on-Line Monitor Device transmits, and carry out accident analysis according to these data and locate, demonstrate grounded circuit numbering and the earth fault in branch road, it is characterized in that: described insulating power supply is DC power supply independently, and power supply is wire laying mode or mobile portable.
2. DC system earth fault as claimed in claim 1 is isolated and positioner automatically, and it is characterized in that: described switching control is the steady switching device shifter of continuous level.
3. DC system earth fault as claimed in claim 1 is isolated and positioner automatically, it is characterized in that: can also in every branch road, segmentation seal in diverter switch, be in each branch road, have more than more than one diverter switch each power unit of this branch road is connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202620006U CN201805221U (en) | 2010-07-19 | 2010-07-19 | Automatic isolating and positioning device for ground fault of direct current system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202620006U CN201805221U (en) | 2010-07-19 | 2010-07-19 | Automatic isolating and positioning device for ground fault of direct current system |
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| Publication Number | Publication Date |
|---|---|
| CN201805221U true CN201805221U (en) | 2011-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202620006U Expired - Lifetime CN201805221U (en) | 2010-07-19 | 2010-07-19 | Automatic isolating and positioning device for ground fault of direct current system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916986A (en) * | 2010-07-19 | 2010-12-15 | 武汉供电公司变电检修公司 | Method and device for automatically isolating and positioning earth faults of Dc system |
| CN104678341A (en) * | 2015-03-06 | 2015-06-03 | 国网四川省电力公司电力科学研究院 | Detection device and detection method for station-dedicated DC power system insulation monitoring device |
| CN109782106A (en) * | 2019-01-07 | 2019-05-21 | 邯郸钢铁集团有限责任公司 | A kind of DC system earth fault lookup device and method |
-
2010
- 2010-07-19 CN CN2010202620006U patent/CN201805221U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916986A (en) * | 2010-07-19 | 2010-12-15 | 武汉供电公司变电检修公司 | Method and device for automatically isolating and positioning earth faults of Dc system |
| CN104678341A (en) * | 2015-03-06 | 2015-06-03 | 国网四川省电力公司电力科学研究院 | Detection device and detection method for station-dedicated DC power system insulation monitoring device |
| CN109782106A (en) * | 2019-01-07 | 2019-05-21 | 邯郸钢铁集团有限责任公司 | A kind of DC system earth fault lookup device and method |
| CN109782106B (en) * | 2019-01-07 | 2021-03-09 | 邯郸钢铁集团有限责任公司 | Direct current system ground fault searching device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110420 Effective date of abandoning: 20130227 |
|
| RGAV | Abandon patent right to avoid regrant |