CN106711986A - Voltage stabilizing device for neutral point - Google Patents
Voltage stabilizing device for neutral point Download PDFInfo
- Publication number
- CN106711986A CN106711986A CN201710146339.6A CN201710146339A CN106711986A CN 106711986 A CN106711986 A CN 106711986A CN 201710146339 A CN201710146339 A CN 201710146339A CN 106711986 A CN106711986 A CN 106711986A
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- CN
- China
- Prior art keywords
- phase
- terminal
- controller
- linked switch
- neutral point
- 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.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a voltage stabilizing device for a neutral point. The voltage stabilizing device is characterized in that one end of a three-phase linked switch is electrically connected with a bus bar terminal of a three-phase system, and the other end of the three-phase linked switch is electrically connected with a grounding terminal by a grounding transformer; a signal control end of the three-phase linked switch and a control terminal of a current transferring branch are respectively and electrically connected with the output end of a controller; the input end of the controller is electrically connected with a voltage signal access terminal; the controller is specifically used for judging grounding faults by system voltage signals acquired from the voltage signal access terminal when the system generates single-phase grounding faults, then the control terminal of the current transferring branch sends a commissioning control signal, and then the three-phase linked switch is switched-on; and after elimination of the single-phase grounding faults, the control terminal of the current transferring branch sends a stopping control signal, and then the three-phase linked switch is switched-on. The voltage stabilizing device has the advantages that contacts are adopted for transferring fault point current, so that the system oscillation is avoided, the fault points are effectively protected, and the effects of preventing the extension of accidents and protecting the personal safety are achieved.
Description
Technical field
The invention belongs to electric network fault process field, a kind of neutral point stable-pressure device is in particular related to.
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
, it is necessary to find fault branch and process in time in time during generation singlephase earth fault, during fault recovery, system shake is easily caused
Swing, bring security incident.
Prior art in fault recovery, because the voltage sensor of system is the unique zero sequence passage earth point of system, and
Its impedance is very high, and the energy of systematic parameter impact cannot discharge, and cause system to be shaken, and voltage sensor fusing is damaged when serious
Device or voltage sensor in itself, or even cause system operatio overvoltage, destruction system equipment insulation.
The content of the invention
According to problems of the prior art, the invention provides a kind of neutral point stable-pressure device, when system occurs list
Phase earth fault and when processing completion, shifts current in the fault point, it is to avoid system is shaken, effectively protection by the present apparatus using contact
Trouble point, playing prevents fault spread, protects the effect of personal safety.
To achieve the above object, the present invention uses following technical scheme：
A kind of neutral point stable-pressure device, it is characterised in that：One end of three-phase linked switch and three-phase system bus terminal electricity
Connection, the grounded transformer of the other end are electrically connected with ground terminal；Signal control end and electric current the transfer branch of three-phase linked switch
Output end of the road control terminal with the controller is electrically connected；The input of the controller accesses terminal electricity with voltage signal
Connection；The controller is specifically for after system occurs singlephase earth fault, controller accesses terminal and obtains by voltage signal
After the system voltage signal for taking judges earth fault phase, first the control letter that puts into operation is sent via electric current transfer branch road control terminal
Number, then the three-phase linked switch that closes a floodgate, after singlephase earth fault is eliminated, termination control is sent via electric current transfer branch road control terminal
Signal, then separating brake three-phase linked switch.
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 via impedor with ground terminal.
It is further preferred that the 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 shifts the mutual cooperation of branch road by three-phase linked switch and electric current, using three-phase linked switch contact
Transfer current in the fault point, it is to avoid system is shaken, and effectively protects trouble point, and playing prevents fault spread, protects the work of personal safety
With.
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.
Brief description of the drawings
Fig. 1 is the structure connection diagram of apparatus of the present invention.
Reference：10-controller, 20-voltage signal access terminal, 30-electric current transfer branch road access terminal, a,
B, c-bus terminal, 40-three-phase linked switch, 50-grounding transformer, 60-ground terminal, 70-impedor.
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 neutral point stable-pressure device, one end of three-phase linked switch 40 and three-phase system bus terminal a,
B, c electrical connection, the grounded transformer 50 of the other end are electrically connected with ground terminal 60；The signal control end of three-phase linked switch 40 and
Electric current transfer branch road 30 output end with the controller 10 of control terminal is electrically connected；The input of the controller 10 and electricity
Pressure signal accesses terminal 30 and electrically connects；The controller 10 specifically for when system occur singlephase earth fault after, controller 10
After the system voltage signal for accessing the acquisition of terminal 20 by voltage signal judges earth fault phase, first branch road control is shifted via electric current
Terminal processed 30 sends the control signal that puts into operation, then the three-phase linked switch 40 that closes a floodgate, after singlephase earth fault is eliminated, via electric current
Transfer branch road control terminal 30 sends termination control signal, then separating brake three-phase linked switch 40.
The three-phase linked switch 40 is the mechanical switch or electronic switch of combined operation；The three-phase linked switch 40
Original state is off-state, maintains three-phase system normally to run；The neutral point of the grounding transformer 50 is via impedor 70
Electrically connected with ground terminal 60；The impedor 70 is one or two combinations in resistive impedor, emotional resistance device；It is described
Controller 10 uses single-chip microcomputer or microcomputer.
With reference to specific work process and accompanying drawing, neutral point stable-pressure device of the invention and implementation are carried out in detail
Explanation：
As shown in figure 1, when three-phase system normally runs, three-phase linked switch 40 is disconnection or high-impedance state, works as system
After generation singlephase earth fault, controller 10 judges ground connection by the system voltage signal that voltage signal accesses the acquisition of terminal 20
Failure phase；Controller 10 sends the control signal that puts into operation, then the three-phase ganged that closes a floodgate via electric current transfer branch road control terminal 30
Switch 40, after singlephase earth fault is eliminated, termination control signal, then separating brake three is sent via electric current transfer branch road control terminal 30
Be connected switch 40.
By above step, before involution electric current transfer branch road, closed a floodgate grounding transformer using three-phase linked switch 40
50 input coefficients, form zero sequence passage of the zero sequence impedance much smaller than voltage sensor zero sequence impedance；When the transfer of involution electric current
During branch road, energy is discharged by Low ESR ground connection variable conduit caused by systematic parameter impact, and the voltage sensor zero sequence of high impedance is led to
Almost no energy passes through in road, so as to effectively protect voltage sensor fuse and voltage sensor in itself, and can suppress
System is because of the concussion of system zero sequence, suppression system switching overvoltage, effective protection system equipment caused by operation.
In sum, by the cooperation of this neutral point stable-pressure device and above step, the present apparatus can avoid system from shaking,
Trouble point is effectively protected, playing prevents fault spread, protect the effect of personal safety.
Claims (6)
1. a kind of neutral point stable-pressure device, it is characterised in that：One end of three-phase linked switch (40) and three-phase system bus terminal
(a, b, c) electrical connection, the grounded transformer of the other end (50) are electrically connected with ground terminal (60)；The letter of three-phase linked switch (40)
Number control end and electric current shift output end of branch road control terminal (30) with the controller (10) and electrically connect；The controller
(10) input accesses terminal (30) and electrically connects with voltage signal；The controller (10) specifically for when system occur it is single-phase
After earth fault, controller (10) judges earth fault phase by the system voltage signal that voltage signal accesses terminal (20) acquisition
Afterwards, first shift branch road control terminal (30) via electric current and send the control signal that puts into operation, then the three-phase linked switch that closes a floodgate (40),
After singlephase earth fault is eliminated, shift branch road control terminal (30) via electric current and send termination control signal, then separating brake three is connected
Dynamic switch (40).
2. a kind of neutral point stable-pressure device according to claim 1, it is characterised in that：The three-phase linked switch (40) is
The mechanical switch or electronic switch of combined operation.
3. a kind of neutral point stable-pressure device according to claim 2, it is characterised in that：The three-phase linked switch (40)
Original state is off-state, maintains three-phase system normally to run.
4. a kind of neutral point stable-pressure device according to claim 1, it is characterised in that：In the grounding transformer (50)
Property point is electrically connected via impedor (70) with ground terminal (60).
5. a kind of neutral point stable-pressure device according to claim 4, it is characterised in that：The impedor (70) is resistive resistance
One or two combinations in anti-device, emotional resistance device.
6. a kind of neutral point stable-pressure device according to claim 1, it is characterised in that：The controller (10) uses monolithic
Machine or microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710146339.6A CN106711986A (en) | 2017-03-13 | 2017-03-13 | Voltage stabilizing device for neutral point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710146339.6A CN106711986A (en) | 2017-03-13 | 2017-03-13 | Voltage stabilizing device for neutral point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106711986A true CN106711986A (en) | 2017-05-24 |
Family
ID=58918245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710146339.6A Pending CN106711986A (en) | 2017-03-13 | 2017-03-13 | Voltage stabilizing device for neutral point |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106711986A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596931A (en) * | 2017-09-30 | 2019-04-09 | 西门子（中国）有限公司 | The fault-line selecting method of system with non effectively earth ed neutral |
Citations (7)
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|---|---|---|---|---|
| EP1817829A2 (en) * | 2004-10-21 | 2007-08-15 | Frantisek Zak | Wiring diagram for watt and blind current component compensation in the earth fault point and phase-to-ground voltage equalization under failure-free network condition |
| CN101183788A (en) * | 2007-12-11 | 2008-05-21 | 广州智光电气股份有限公司 | Power network controlled reactance and small resistor combination type earthing device |
| CN201821097U (en) * | 2010-10-26 | 2011-05-04 | 安徽首创电气科技有限公司 | Arc extinguishing cabinet |
| CN102623984A (en) * | 2012-03-23 | 2012-08-01 | 上海市电力公司 | System for grounding neutral point in power grid through controllable reactor and resistor in combined manner |
| CN102623985A (en) * | 2012-01-17 | 2012-08-01 | 合肥凯高电气设备有限公司 | Novel comprehensive grounding protection and route selection device for medium-voltage power distribution system |
| CN103545796A (en) * | 2013-09-16 | 2014-01-29 | 国家电网公司 | Single-phase grounding fault handling device and method for power distribution network with non-effectively grounded neutral points |
| CN206575156U (en) * | 2017-03-13 | 2017-10-20 | 安徽一天电气技术股份有限公司 | A kind of neutral point stable-pressure device |
-
2017
- 2017-03-13 CN CN201710146339.6A patent/CN106711986A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1817829A2 (en) * | 2004-10-21 | 2007-08-15 | Frantisek Zak | Wiring diagram for watt and blind current component compensation in the earth fault point and phase-to-ground voltage equalization under failure-free network condition |
| CN101183788A (en) * | 2007-12-11 | 2008-05-21 | 广州智光电气股份有限公司 | Power network controlled reactance and small resistor combination type earthing device |
| CN201821097U (en) * | 2010-10-26 | 2011-05-04 | 安徽首创电气科技有限公司 | Arc extinguishing cabinet |
| CN102623985A (en) * | 2012-01-17 | 2012-08-01 | 合肥凯高电气设备有限公司 | Novel comprehensive grounding protection and route selection device for medium-voltage power distribution system |
| CN102623984A (en) * | 2012-03-23 | 2012-08-01 | 上海市电力公司 | System for grounding neutral point in power grid through controllable reactor and resistor in combined manner |
| CN103545796A (en) * | 2013-09-16 | 2014-01-29 | 国家电网公司 | Single-phase grounding fault handling device and method for power distribution network with non-effectively grounded neutral points |
| CN206575156U (en) * | 2017-03-13 | 2017-10-20 | 安徽一天电气技术股份有限公司 | A kind of neutral point stable-pressure device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596931A (en) * | 2017-09-30 | 2019-04-09 | 西门子（中国）有限公司 | The fault-line selecting method of system with non effectively earth ed neutral |
| CN109596931B (en) * | 2017-09-30 | 2021-09-10 | 西门子（中国）有限公司 | Fault line selection method of neutral point non-effective grounding system |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170524 |
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| WD01 | Invention patent application deemed withdrawn after publication |