CN202330619U - Novel intelligent low-current grounded line selection device - Google Patents
Novel intelligent low-current grounded line selection device Download PDFInfo
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- CN202330619U CN202330619U CN2011204532663U CN201120453266U CN202330619U CN 202330619 U CN202330619 U CN 202330619U CN 2011204532663 U CN2011204532663 U CN 2011204532663U CN 201120453266 U CN201120453266 U CN 201120453266U CN 202330619 U CN202330619 U CN 202330619U
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- zero
- sequence
- novel intelligent
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- mainboard
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Abstract
The utility model provides a novel intelligent low-current grounded line selection device. The novel intelligent low-current grounded line selection device comprises a mainboard, a plurality of zero-sequence mutual inductors and a plurality of communication cables, wherein three central processing units (CPU) are arranged on the mainboard, and are electrically connected with a voltage transformer of a grounding bus to acquire the zero-sequence voltage of a triangular part of an opening of the voltage transformer; the communication cables are connected with the zero-sequence mutual inductors and the mainboard; and the zero-sequence mutual inductors are electrically connected with a plurality of outgoing lines of the bus respectively so as to acquire zero-sequence current of the outgoing lines of the bus. According to the novel intelligent low-current grounded line selection device, the three CPUs are used for monitoring the zero-sequence voltage and the zero-sequence current of each section of the bus of a system in real time on line; the zero-sequence voltage of the triangular part of the opening of the voltage transformer of the grounding bus, the zero-sequence current of the outgoing lines of the bus, and the phase relation between the zero-sequence voltage and the zero-sequence current are independently calculated and analyzed by adopting three different methods; and whether a ground fault happens is judged in a way that three takes two, so that the reliability is higher, and a high faulty line selection rate is obtained.
Description
Technical field
The utility model relates to field of power electronics, relates in particular to a kind of novel intelligent Small Electric Current Earthing And Routing Device.
Background technology
In 3-35 kilovolts of three-phase electrical power systems, phase fault if untimely processing may develop into non-fault phase insulation breakdown, takes place in modal fault in the medium voltage distribution network then during single-phase earthing.Judge that timely and accurately fault loop particularly seems important, but present Small Electric Current Earthing And Routing Device effect can not be satisfactory, often falsely drop and leak choosing.
The utility model content
In view of this, the utility model provides a kind of faulty line route selection rate preferable novel intelligent Small Electric Current Earthing And Routing Device.
The utility model is to realize like this; A kind of novel intelligent Small Electric Current Earthing And Routing Device; It comprises mainboard, some ZCTs that is provided with three CPU and the some communication cables that connect said some ZCTs and said mainboard; The voltage transformer (VT) that three CPU of said mainboard all are electrically connected at ground strap to be obtaining the residual voltage at its open delta place, and said some ZCTs are electrically connected at respectively in some outlets of bus to obtain the zero-sequence current of said bus outlet.
As the further improvement of such scheme, said novel intelligent Small Electric Current Earthing And Routing Device also comprises and is electrically connected at the cue circuit that said mainboard is used to point out the faulty line of being selected by said three CPU; Said cue circuit is at least a in display or the digital display tube; Said three CPU adopt three nuclear control devices.
The novel intelligent Small Electric Current Earthing And Routing Device that the utility model provides adopts three each section of CPU real time on-line monitoring system bus residual voltages and zero-sequence current to use; Adopt size, phase relation between the zero-sequence current of residual voltage and this bus outlet at three kinds of distinct methods independence computational analysis ground strap voltage transformer (VT) open delta places; Adopt 3 to get 2 votings, judge whether to take place earth fault, thereby reliability is higher, obtain preferable faulty line route selection rate.
Description of drawings
Fig. 1 is the circuit diagram of the novel intelligent Small Electric Current Earthing And Routing Device that provides of the utility model preferred embodiments.
Symbol description
| The novel intelligent Small Electric Current Earthing And Routing Device | 100 |
| Mainboard | 10 |
| ZCT | TA1, TA2, TA3, TA4, TA5, TA6 |
| Residual voltage | U 30 |
| Zero-sequence current | l 01, l 02, l 03, l 04, l 05, l 06 |
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also Fig. 1, the circuit diagram of the novel intelligent Small Electric Current Earthing And Routing Device 100 that it provides for the utility model preferred embodiments, novel intelligent Small Electric Current Earthing And Routing Device 100 comprises: the mainboard 10 that is provided with three CPU (i.e. three nuclear control devices); Some ZCT TA1, TA2, TA3, TA4, TA5, TA6; And the some communication cables that connect some ZCT TA1, TA2, TA3, TA4, TA5, TA6 and mainboard 10.
Three CPU of mainboard 10 all are electrically connected at the voltage transformer pt of ground strap to obtain the residual voltage U at its open delta place
30, some ZCT TA1, TA2, TA3, TA4, TA5, TA6 are electrically connected at respectively in some outlets of bus to obtain the zero-sequence current l of said bus outlet
01, l
02, l
03, l
04, l
05, l
06
Novel intelligent Small Electric Current Earthing And Routing Device 100 adopts three each section of CPU real time on-line monitoring system bus residual voltage U
30With zero-sequence current l
01, l
02, l
03, l
04, l
05, l
06, when system's (being expressed as the figure of switch symbols in like Fig. 1) when normally moving, zero-sequence current l
01, l
02, l
03, l
04, l
05, l
06Value be zero, when system's generation earth fault, its corresponding zero-sequence current no longer is zero, device is with the residual voltage U at three kinds of distinct methods independence computational analysis ground strap voltage transformer pt open delta places
30Zero-sequence current l with this bus outlet
01, l
02, l
03, l
04, l
05, l
06Between size, phase relation, and, carry out three and get two votings according to the earth fault criterion of setting, judge whether to take place earth fault, as select faulty line, and then maintenance circulatory monitoring state.
Preferably; Said novel intelligent Small Electric Current Earthing And Routing Device also is provided with and is electrically connected at the cue circuit that said mainboard is used to point out the faulty line of being selected by said three CPU; Be appreciated that said cue circuit is at least a in display or the digital display tube.
In sum, the novel intelligent Small Electric Current Earthing And Routing Device adopts three each section of CPU real time on-line monitoring system bus residual voltages and zero-sequence current to use; Adopt size, phase relation between the zero-sequence current of residual voltage and this bus outlet at three kinds of distinct methods independence computational analysis ground strap voltage transformer (VT) open delta places; Adopt 3 to get 2 votings, judge whether to take place earth fault, thereby reliability is higher, obtain preferable faulty line route selection rate.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
Claims (4)
1. novel intelligent Small Electric Current Earthing And Routing Device; It is characterized in that; It comprises mainboard, some ZCTs that is provided with three CPU and the some communication cables that connect said some ZCTs and said mainboard; The voltage transformer (VT) that three CPU of said mainboard all are electrically connected at ground strap to be obtaining the residual voltage at its open delta place, and said some ZCTs are electrically connected at respectively in some outlets of bus to obtain the zero-sequence current of said bus outlet.
2. novel intelligent Small Electric Current Earthing And Routing Device as claimed in claim 1 is characterized in that, said novel intelligent Small Electric Current Earthing And Routing Device also comprises and is electrically connected at the cue circuit that said mainboard is used to point out the faulty line of being selected by said three CPU.
3. novel intelligent Small Electric Current Earthing And Routing Device as claimed in claim 2 is characterized in that, said cue circuit is at least a in display or the digital display tube.
4. novel intelligent Small Electric Current Earthing And Routing Device as claimed in claim 1 is characterized in that, said three CPU adopt three nuclear control devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204532663U CN202330619U (en) | 2011-11-16 | 2011-11-16 | Novel intelligent low-current grounded line selection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204532663U CN202330619U (en) | 2011-11-16 | 2011-11-16 | Novel intelligent low-current grounded line selection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202330619U true CN202330619U (en) | 2012-07-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204532663U Expired - Fee Related CN202330619U (en) | 2011-11-16 | 2011-11-16 | Novel intelligent low-current grounded line selection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202330619U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535894A (en) * | 2015-01-08 | 2015-04-22 | 国家电网公司 | Small current grounding fault line selection method and device in double-bus operation mode |
| WO2015096546A1 (en) * | 2013-12-25 | 2015-07-02 | 国家电网公司 | On-line information monitoring and control method and system for low-current grounding fault |
| CN107290627A (en) * | 2017-07-01 | 2017-10-24 | 合肥东玖电气有限公司 | A kind of Small Electric Current Earthing And Routing Device |
-
2011
- 2011-11-16 CN CN2011204532663U patent/CN202330619U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015096546A1 (en) * | 2013-12-25 | 2015-07-02 | 国家电网公司 | On-line information monitoring and control method and system for low-current grounding fault |
| CN104535894A (en) * | 2015-01-08 | 2015-04-22 | 国家电网公司 | Small current grounding fault line selection method and device in double-bus operation mode |
| CN104535894B (en) * | 2015-01-08 | 2017-07-07 | 国家电网公司 | Earth fault line selection method and device under the double-bus method of operation |
| CN107290627A (en) * | 2017-07-01 | 2017-10-24 | 合肥东玖电气有限公司 | A kind of Small Electric Current Earthing And Routing Device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20141116 |
|
| EXPY | Termination of patent right or utility model |