CN106771887A - A kind of instantaneous zero sequence voltage drives ground fault line selection device - Google Patents
A kind of instantaneous zero sequence voltage drives ground fault line selection device Download PDFInfo
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- CN106771887A CN106771887A CN201710146862.9A CN201710146862A CN106771887A CN 106771887 A CN106771887 A CN 106771887A CN 201710146862 A CN201710146862 A CN 201710146862A CN 106771887 A CN106771887 A CN 106771887A
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- phase
- terminal
- zero sequence
- line selection
- selection device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Emergency Protection Circuit Devices (AREA)
Abstract
Ground fault line selection device is driven the present invention relates to a kind of instantaneous zero sequence voltage, one end of the device three-phase linked switch is electrically connected with three-phase system bus terminal respectively, the grounded transformer of the other end is electrically connected with ground terminal, signal control end is electrically connected with controller output end；The input of controller accesses terminal with voltage signal respectively and current signal accesses terminal and electrically connects；Controller is used for after system occurs singlephase earth fault, the system voltage signal for accessing terminal acquisition by voltage signal judges earth fault phase, control three-phase linked switch contact closes a floodgate, the branch current signal accessed at terminal by current signal judges fault branch, then separately three-phase linked switch contact.By neutral point, solidly grounded system is not changed into solidly earthed neutral system instantaneously to the present invention, the zero-sequence current for sending is controlled in appropriate scope by impedor, zero sequence current signal flows through fault branch, and fault-signal feature is clearer and more definite, improves the accuracy rate of route selection.
Description
Technical field
The invention belongs to electric network fault detection field, in particular relate to a kind of instantaneous zero sequence voltage and drive earth fault choosing
Line apparatus.
Background technology
In 3~66KV neutral points not solidly grounded system, it is a kind of most common failure that singlephase earth fault occurs.When
During generation singlephase earth fault, due to system three-phase line voltage still keep balance, so electric power system still can with normal work,
But needs are found fault branch and are processed in time in time, otherwise easily cause the system failure, bring security incident.
The line-selected earthing device that current power system is based on neutral point not solidly grounded system is by detecting single-phase earthing
When flow through each branch road capacitance current size and Orientation, then judged by certain processing method be grounded branch road.But by
It is smaller in itself in the fault-signal that flows through earth fault branch road and feature is indefinite, easily done by earth fault dotted state
Disturb, and signal various disturbing factors present in transmitting procedure, cause one-phase grounding wire-selective device route selection accuracy rate low, give
The solution of failure and the Electrical Safety of user bring hidden danger.
The content of the invention
According to problems of the prior art, earth fault line selection is driven the invention provides a kind of instantaneous zero sequence voltage
Device, by the present apparatus, by neutral point, solidly grounded system is not changed into solidly earthed neutral system instantaneously, by impedor
Restriction effect, controls the zero-sequence current for sending in appropriate scope, and zero sequence current signal flows through earth fault branch road, failure letter
Number feature is clearer and more definite, improves the accuracy rate of route selection when earth fault occurs.
To achieve the above object, the present invention uses following technical scheme：
A kind of instantaneous zero sequence voltage drives ground fault line selection device, it is characterised in that：One end of three-phase linked switch point
Do not electrically connected with three-phase system bus terminal, the grounded transformer of the other end is electrically connected with ground terminal, signal control end with
Controller output end is electrically connected；The input of the controller accesses terminal with voltage signal respectively and current signal accesses terminal
Electrical connection；Controller is specifically for after system occurs singlephase earth fault, the system that terminal is obtained being accessed by voltage signal
Voltage signal judges earth fault phase, and control three-phase linked switch contact is closed a floodgate, and the branch at terminal is accessed by current signal
Road current signal judges fault branch, then separately three-phase linked switch contact.
Preferably, the three-phase linked switch is the mechanical switch or electronic switch of combined operation.
It is further preferred that the original state of the three-phase linked switch is off-state, three-phase system is maintained normally to transport
OK.
Preferably, the neutral point of the grounding transformer is electrically connected through impedor with ground terminal.
It is further preferred that impedor is one or two combinations in resistive impedor, emotional resistance device.
Preferably, the controller uses single-chip microcomputer or microcomputer.
The beneficial effects of the present invention are：
1) present invention controls three-phase linked switch to close by controller, and by neutral point, solidly grounded system is not changed into instantaneously
Solidly earthed neutral system, by grounding transformer regulated ground impedance value, controls the zero-sequence current for sending appropriate
Scope, zero sequence current signal flows through earth fault branch road, and fault-signal feature is clearer and more definite, improves when earth fault occurs and selects
The accuracy rate of line.
2) controller of the present invention can be applied to difference using highly versatile, the single-chip microcomputer or microcomputer that are easily programmed
The part of model, can be good at completing the reception and transmission and the treatment of signal of signal and judges.
3) grounding transformer in the present invention does not put into operation when system is normal, is beneficial to the operational reliability of equipment,
Reduce loss.
Brief description of the drawings
Fig. 1 is the structure connection diagram of apparatus of the present invention.
Reference：10-three-phase linked switch, 20-grounding transformer, 30-controller, 40-voltage signal is accessed
Terminal, 50-current signal accesses terminal, 60-ground terminal, 70-impedor, a, b, c-bus terminal.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in figure 1, a kind of instantaneous zero sequence voltage drives ground fault line selection device, one end point of three-phase linked switch 10
Do not electrically connected with three-phase system bus terminal a, b, c, the grounded transformer 20 of the other end is electrically connected with ground terminal 60, signal
Control end is electrically connected with the output end of controller 30；The input of the controller 30 accesses terminal 40 and electricity with voltage signal respectively
Stream signal accesses terminal 50 and electrically connects；Controller 30 by voltage signal specifically for after system occurs singlephase earth fault, being connect
Enter the system voltage signal obtained at terminal 40 and judge earth fault phase, control three-phase linked switch 10 contact closes a floodgate, passes through
The branch current signal that current signal accesses at terminal 50 judges fault branch, then the separately contact of three-phase linked switch 10.
The three-phase linked switch 10 is the mechanical switch or electronic switch of combined operation；The three-phase linked switch 10
Original state is off-state, maintains three-phase system normally to run；The neutral point of the grounding transformer 20 through impedor 70 with
Ground terminal 60 is electrically connected；The impedor 70 is a kind of component or two kinds of first devices in resistive impedor and emotional resistance device
The combination of part；The controller 30 uses single-chip microcomputer or microcomputer.
With reference to specific work process and accompanying drawing, line selection apparatus of the invention and selection method are described in detail：
As shown in figure 1, when three-phase system normally runs, three-phase linked switch 10 is off-state, when neutral point is not straight
Connect earthed system branch road one C phases there is singlephase earth fault after, controller 30 by voltage signal access terminal 40 obtain
System voltage signal judges that earth fault is mutually C phases.
Then the control of controller 30 three-phase linked switch 10 contact closes a floodgate, now by fault branch one, earth fault, big
The zero-sequence current that the loop that ground, impedor 70, grounding transformer 20 and three-phase linked switch 10 are formed produces passes through fault branch
One.
Last controller 30 judges that fault branch is branch by the branch current signal that current signal is accessed at terminal 50
Lu Yi, then control the contact of three-phase linked switch 10 to separate.
In sum, by the cooperation of this line selection apparatus and above step, by neutral point, solidly grounded system does not become instantaneously
It is solidly earthed neutral system, by the restriction effect of impedor, the zero-sequence current for sending is controlled in appropriate scope, zero
Sequence current signal flows through earth fault branch road, and fault-signal feature is clearer and more definite, improves the standard of route selection when earth fault occurs
True rate.
Claims (6)
1. a kind of instantaneous zero sequence voltage drives ground fault line selection device, it is characterised in that：One end of three-phase linked switch (10)
Electrically connected with three-phase system bus terminal (a, b, c) respectively, the grounded transformer (20) of the other end and ground terminal (60) electricity
Connection, signal control end are electrically connected with controller (30) output end；The input of the controller (10) respectively with voltage signal
Access terminal (40) and current signal accesses terminal (50) electrical connection；Specifically for there is single-phase earthing when system in controller (30)
After failure, the system voltage signal for accessing terminal (40) acquisition by voltage signal judges earth fault phase, and control three is connected
Dynamic switch (10) contact closes a floodgate, and the branch current signal for accessing terminal (50) place by current signal judges fault branch, then
Separate three-phase linked switch (10) contact.
2. a kind of instantaneous zero sequence voltage according to claim 1 drives ground fault line selection device, it is characterised in that：It is described
Three-phase linked switch (10) is the mechanical switch or electronic switch of combined operation.
3. a kind of instantaneous zero sequence voltage according to claim 2 drives ground fault line selection device, it is characterised in that：It is described
The original state of three-phase linked switch (10) is off-state, maintains three-phase system normally to run.
4. a kind of instantaneous zero sequence voltage according to claim 1 drives ground fault line selection device, it is characterised in that：It is described
The neutral point of grounding transformer (20) is electrically connected through impedor (70) with ground terminal (60).
5. a kind of instantaneous zero sequence voltage according to claim 4 drives ground fault line selection device, it is characterised in that：It is described
Impedor (70) is one or two combinations in resistive impedor, emotional resistance device.
6. a kind of instantaneous zero sequence voltage according to claim 1 drives ground fault line selection device, it is characterised in that：It is described
Controller (30) uses single-chip microcomputer or microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710146862.9A CN106771887A (en) | 2017-03-13 | 2017-03-13 | A kind of instantaneous zero sequence voltage drives ground fault line selection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710146862.9A CN106771887A (en) | 2017-03-13 | 2017-03-13 | A kind of instantaneous zero sequence voltage drives ground fault line selection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106771887A true CN106771887A (en) | 2017-05-31 |
Family
ID=58962610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710146862.9A Withdrawn CN106771887A (en) | 2017-03-13 | 2017-03-13 | A kind of instantaneous zero sequence voltage drives ground fault line selection device |
Country Status (1)
| Country | Link |
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| CN (1) | CN106771887A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115389860A (en) * | 2022-05-16 | 2022-11-25 | 国网四川省电力公司电力科学研究院 | Power distribution network single-phase high-resistance grounding line selection strategy based on current composite criterion |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06347503A (en) * | 1993-06-10 | 1994-12-22 | Nissin Electric Co Ltd | Ground fault position locating apparatus |
| CN2594804Y (en) * | 2002-06-10 | 2003-12-24 | 泰安开发区鲁兴测控设备研究所 | Cable checking instrument |
| CN101303387A (en) * | 2008-04-09 | 2008-11-12 | 中国石油化工股份有限公司胜利油田分公司临盘采油厂 | Direct current injection type route selecting positioning system and method thereof |
| CN103278737A (en) * | 2013-04-25 | 2013-09-04 | 河北兆联电气设备科技有限公司 | Direct-current self-injection type small-current grounding and route selecting system and method |
| CN104635107A (en) * | 2015-02-27 | 2015-05-20 | 国网福建晋江市供电有限公司 | Small-current grounding fault line selection system and line selection method |
| CN205484653U (en) * | 2016-03-23 | 2016-08-17 | 安徽新力电气设备有限责任公司 | Net route selection device is joined in marriage in resistance disturbance |
| CN106443339A (en) * | 2016-09-28 | 2017-02-22 | 南京能迪电气技术有限公司 | Method for selecting wire after single-phase grounding of ungrounded system |
-
2017
- 2017-03-13 CN CN201710146862.9A patent/CN106771887A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06347503A (en) * | 1993-06-10 | 1994-12-22 | Nissin Electric Co Ltd | Ground fault position locating apparatus |
| CN2594804Y (en) * | 2002-06-10 | 2003-12-24 | 泰安开发区鲁兴测控设备研究所 | Cable checking instrument |
| CN101303387A (en) * | 2008-04-09 | 2008-11-12 | 中国石油化工股份有限公司胜利油田分公司临盘采油厂 | Direct current injection type route selecting positioning system and method thereof |
| CN103278737A (en) * | 2013-04-25 | 2013-09-04 | 河北兆联电气设备科技有限公司 | Direct-current self-injection type small-current grounding and route selecting system and method |
| CN104635107A (en) * | 2015-02-27 | 2015-05-20 | 国网福建晋江市供电有限公司 | Small-current grounding fault line selection system and line selection method |
| CN205484653U (en) * | 2016-03-23 | 2016-08-17 | 安徽新力电气设备有限责任公司 | Net route selection device is joined in marriage in resistance disturbance |
| CN106443339A (en) * | 2016-09-28 | 2017-02-22 | 南京能迪电气技术有限公司 | Method for selecting wire after single-phase grounding of ungrounded system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115389860A (en) * | 2022-05-16 | 2022-11-25 | 国网四川省电力公司电力科学研究院 | Power distribution network single-phase high-resistance grounding line selection strategy based on current composite criterion |
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