CN206573663U - A kind of three resistance line voltages driving ground fault line selection device - Google Patents
A kind of three resistance line voltages driving ground fault line selection device Download PDFInfo
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- CN206573663U CN206573663U CN201720241152.XU CN201720241152U CN206573663U CN 206573663 U CN206573663 U CN 206573663U CN 201720241152 U CN201720241152 U CN 201720241152U CN 206573663 U CN206573663 U CN 206573663U
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- electrically connected
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- operation switch
- selection device
- ground fault
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Abstract
The utility model belongs to electric network fault detection field, in particular relate to a kind of three resistance line voltage driving ground fault line selection device, one end of the device split-phase Operation switch is electrically connected with three-phase system bus terminal, and the other end is electrically connected through impedor with ground terminal respectively；The signal control end of split-phase Operation switch is electrically connected with controller output end；The input of the controller accesses terminal with voltage signal respectively and current signal access terminal is electrically connected.The utility model by three impedors the current control sent in appropriate scope, current signal flows through earth fault branch road, and fault-signal feature is clearer and more definite, improve earth fault occur when route selection accuracy rate.
Description
Technical field
The utility model belongs to electric network fault detection field, in particular relates to a kind of three resistance line voltage driving ground connection event
Hinder line selection apparatus.
Background technology
In 3~66KV neutral points not solidly grounded system, it is a kind of most common failure to occur singlephase earth fault.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 handled in time in time, otherwise easily cause the system failure, bring security incident.
Line-selected earthing device of the current power system based on neutral point not solidly grounded system is by detecting single-phase earthing
When, the size and Orientation of the capacitance current of each branch road is flowed through, then judge by certain processing method to be grounded branch road.But by
It is smaller in itself and feature is indefinite in the fault-signal that flows through earth fault branch road, 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.
Utility model content
According to problems of the prior art, the utility model provides a kind of three resistance line voltage and drives earth fault
Line selection apparatus, the present apparatus by three impedors the current control sent in appropriate scope, current signal flow through ground connection therefore
Hinder branch road, fault-signal feature is clearer and more definite, improve the accuracy rate of route selection when earth fault occurs.
To achieve the above object, the utility model uses following technical scheme：
A kind of three resistance line voltages driving ground fault line selection device, it is characterised in that：One end of split-phase Operation switch with
Three-phase system bus terminal is electrically connected, and the other end is electrically connected through impedor with ground terminal respectively；The signal of split-phase Operation switch
Control end is electrically connected with controller output end；The input of the controller accesses terminal and current signal with voltage signal respectively
Access terminal electrical connection.
It is preferred that, the split-phase Operation switch is mechanical switch or electronic switch.
It is further preferred that each contact original state of the split-phase Operation switch is off-state, three-phase system is maintained
The normal operation row of system.
It is preferred that, the impedor is the combination of one or both of resistive impedor, emotional resistance device.
It is preferred that, the controller uses single-chip microcomputer or microcomputer.
The beneficial effects of the utility model are：
1) the utility model controls split-phase Operation switch one contact to close a floodgate by controller, by three impedors hair
The current control gone out is in appropriate scope, and current signal flows through earth fault branch road, and fault-signal feature is clearer and more definite, improves
The accuracy rate of route selection when earth fault occurs.
2) controller described in the utility model can be applied to not using highly versatile, the singlechip chip being easily programmed
The part of same model, can be good at completing the reception and transmission and the processing and judgement of signal of signal.
Brief description of the drawings
Fig. 1 is the structure connection diagram of the utility model device.
Reference：10-controller, 20-voltage signal access terminal, 30-current signal access terminal, a, b, c-
Bus terminal, 40-split-phase Operation switch, 51,52,53-impedor, 60-ground terminal.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
As shown in figure 1, one end of split-phase Operation switch 40 is electrically connected with three-phase system bus terminal a, b, c, the other end point
Do not electrically connected through impedor 51~53 with ground terminal 60；The signal control end of split-phase Operation switch 40 and the output end of controller 10
Electrical connection；The input of the controller 10 accesses terminal 20 with voltage signal respectively and current signal access terminal 30 is electrically connected
Connect.
The split-phase Operation switch 40 is mechanical switch or electronic switch；Each contact of the split-phase Operation switch 40 is initial
State is off-state, maintains three-phase system normally to run；The impedor 51~53 is resistive impedor, emotional resistance device
One or both of combination；The controller 10 uses single-chip microcomputer or microcomputer.
The utility model when in use, can coordinate to be used with software of the prior art.With reference to existing
Operation principle of the present utility model is described software in technology, it must be noted that be：Match with the utility model
The software of conjunction is not innovative part of the present utility model, nor part of the present utility model.
As shown in figure 1, when three-phase system is normally run, each contact original state of split-phase Operation switch 40 is to disconnect
State, after earth fault occurs for the C phases of system branch one, controller 10 accesses the system that terminal 20 is obtained by voltage signal
Voltage signal judges that earth fault is mutually C phases；
Controller 10 controls the one in split-phase Operation switch 40A phases contact or B phase contacts to close a floodgate, by fault branch one, C
The line voltage that the loop of phase earth fault, the earth, impedor 51 or impedor 52 and the formation of split-phase Operation switch 40 is produced is driven
Streaming current passes through fault branch one；
The branch current signal that controller 10 is accessed at terminal 30 by current signal judges that fault branch is branch road one,
The above-mentioned A contacts of split-phase Operation switch 40 or B contacts are separated again.
In summary, by the cooperation of this line selection apparatus and above step, by impedor current control appropriate
Scope, current signal flows through earth fault branch road, and fault-signal feature is clearer and more definite, improves route selection when earth fault occurs
Accuracy rate.
Claims (5)
1. a kind of three resistance line voltage drives ground fault line selection device, it is characterised in that：One end of split-phase Operation switch (40)
Electrically connected with three-phase system bus terminal (a, b, c), the other end is electrically connected through impedor (51~53) with ground terminal (60) respectively
Connect；The signal control end of split-phase Operation switch (40) is electrically connected with controller (10) output end；The input of the controller (10)
End is electrically connected with voltage signal access terminal (20) and current signal access terminal (30) respectively.
2. a kind of three resistance line voltage driving ground fault line selection device according to claim 1, it is characterised in that：It is described
Split-phase Operation switch (40) is mechanical switch or electronic switch.
3. a kind of three resistance line voltage driving ground fault line selection device according to claim 2, it is characterised in that：It is described
Each contact original state of split-phase Operation switch (40) is off-state, maintains three-phase system normally to run.
4. a kind of three resistance line voltage driving ground fault line selection device according to claim 1, it is characterised in that：It is described
Impedor (51~53) is the combination of one or both of resistive impedor, emotional resistance device.
5. a kind of three resistance line voltage driving ground fault line selection device according to claim 1, it is characterised in that：It is described
Controller (10) uses single-chip microcomputer or microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720241152.XU CN206573663U (en) | 2017-03-13 | 2017-03-13 | A kind of three resistance line voltages driving ground fault line selection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720241152.XU CN206573663U (en) | 2017-03-13 | 2017-03-13 | A kind of three resistance line voltages driving ground fault line selection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206573663U true CN206573663U (en) | 2017-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720241152.XU Active CN206573663U (en) | 2017-03-13 | 2017-03-13 | A kind of three resistance line voltages driving ground fault line selection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188166A (en) * | 2018-08-28 | 2019-01-11 | 厦门科华恒盛股份有限公司 | Ground fault detection device and method |
| CN109188167A (en) * | 2018-08-28 | 2019-01-11 | 厦门科华恒盛股份有限公司 | Ground fault detection device and method |
-
2017
- 2017-03-13 CN CN201720241152.XU patent/CN206573663U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188166A (en) * | 2018-08-28 | 2019-01-11 | 厦门科华恒盛股份有限公司 | Ground fault detection device and method |
| CN109188167A (en) * | 2018-08-28 | 2019-01-11 | 厦门科华恒盛股份有限公司 | Ground fault detection device and method |
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