CN110247382A - A kind of neutral grounding mode switching device and method - Google Patents
A kind of neutral grounding mode switching device and method Download PDFInfo
- Publication number
- CN110247382A CN110247382A CN201910352342.2A CN201910352342A CN110247382A CN 110247382 A CN110247382 A CN 110247382A CN 201910352342 A CN201910352342 A CN 201910352342A CN 110247382 A CN110247382 A CN 110247382A
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- Prior art keywords
- power distribution
- distribution network
- control switch
- neutral
- grounding
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The embodiment of the present application discloses a kind of neutral grounding mode switching device and method, and when power distribution network operates normally, controller disconnects the control switch of grounding resistor, while monitoring electric network capacitance and current, determines the assembled state of the adjustable condenser group of arc suppression coil.When just singlephase earth fault occurs for power distribution network, controller according to adjustable condenser group assembled state, arc suppression coil is adjusted to overcompensation state, the effect for giving full play under grounding through arc mode that fault point aftercurrent is small, slows down failure and mutually restoring rate of voltage rise, makes transient fault disappear automatically.When the duration that singlephase earth fault occurs for power distribution network is greater than preset duration, it is closed the control switch, while so that neutral point is passed through grounding through arc, grounded resistance-grounded system.
Description
Technical field
This application involves distribution network technology field more particularly to a kind of neutral grounding mode switching device and methods.
Background technique
Electric connecting mode between three-phase ac power system neutral and the earth, referred to as power network neutral point ground connection side
Formula.Neutral grounding mode is related to the security reliability of power distribution network, economy.6-35kV power distribution network generally uses neutral point is non-to have
Earthing mode is imitated, neutral non-effective grounding mode includes: through grounding through arc and resistance grounded.Different neutral points connect
Ground mode has respective advantage and disadvantage, and neutral by arc extinction coil grounding mode has single-phase earthing aftercurrent small, sustainable
The advantages of power supply, but there are problems that generating resonance overvoltage；Neutral Grounding through Resistance in Electrical mode is to preventing resonance overvoltage
Earth current when having certain superiority, but being increased ground fault.
The selection of neutral grounding mode should make power distribution network have preferable operation characteristic, select not under different operating conditions
The same mode of connection, is of great significance to the safe and stable operation of power distribution network.But current neutral grounding in distribution power network
It is commonly single earthing mode, since every kind of earthing mode has its shortcoming, in the feelings that distribution network system is increasingly complicated
Under condition, existing single neutral grounding mode can not effectively eliminate the failure that power distribution network is occurred.
Summary of the invention
In order to solve existing single neutral grounding mode, the failure that power distribution network is occurred can not be effectively eliminated
Problem, the application disclose a kind of neutral grounding mode switching device and method by following embodiment.
In the application in a first aspect, disclosing a kind of neutral grounding mode switching device, comprising:
Controller, the arc suppression coil for being connected to system neutral and connecing for system neutral is connected to by control switch
Ground resistance device；
The controller is used to disconnect the control switch when power distribution network operates normally, and monitors electric network capacitance and current, and
Determine the assembled state of the adjustable condenser group of arc suppression coil；
The controller is also used to when singlephase earth fault occurs for power distribution network, according to the combination of the adjustable condenser group
The arc suppression coil is adjusted to overcompensation state, and is greater than in the duration that singlephase earth fault occurs for power distribution network and presets by state
When duration, it is closed the control switch.
Optionally, described device further includes failure line selection and locating module；
The failure line selection and locating module are used for after control switch closure, acquisition fault message, and according to
The fault message judges that the route to break down, the fault message include route zero-sequence current.
Optionally, described device further includes grounding transformer；
The grounding transformer is used to provide the described system neutral.
In the application second aspect, a kind of neutral grounding mode operation/cutting method is disclosed, this method is applied to the application
Controller in neutral grounding mode switching device disclosed in first aspect, the neutral grounding mode switching device also wrap
It includes the arc suppression coil for being connected to system neutral and is connected to the grounding resistor of system neutral by control switch, it is described
Method includes:
When power distribution network operates normally, the control switch is disconnected, monitors electric network capacitance and current, and determine arc suppression coil
The assembled state of adjustable condenser group；
When singlephase earth fault occurs for power distribution network, according to the assembled state of the adjustable condenser group, by the extinguishing arc
Coil is adjusted to overcompensation state, and when the duration that singlephase earth fault occurs for power distribution network is greater than preset duration, described in closure
Control switch.
Optionally, the method also includes:
After control switch closure, failure line selection and locating module obtain fault message, and according to the failure
Information judges that the route to break down, the fault message include route zero-sequence current.
The embodiment of the present application discloses a kind of neutral grounding mode switching device and method, operates normally in power distribution network
When, controller disconnects the control switch of grounding resistor, while monitoring electric network capacitance and current, determines the tunable capacitor of arc suppression coil
The assembled state of device group.When just singlephase earth fault occurs for power distribution network, controller according to adjustable condenser group assembled state,
Arc suppression coil is adjusted to overcompensation state, give full play under grounding through arc mode fault point aftercurrent is small, slow down therefore
Barrier mutually restores the effect of rate of voltage rise, and transient fault is made to disappear automatically.When singlephase earth fault occurs for power distribution network
When length is greater than preset duration, it is closed the control switch, while so that neutral point is passed through grounding through arc, grounded resistor
Ground connection.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is a kind of structural schematic diagram of neutral ground method switching device disclosed in the embodiment of the present application.
Specific embodiment
In order to solve existing single neutral grounding mode, the failure that power distribution network is occurred can not be effectively eliminated
Problem, the application disclose a kind of neutral grounding mode switching device and method by following embodiment.
The application first embodiment discloses a kind of neutral grounding mode switching device, and structure shown in Figure 1 is shown
It is intended to, which includes:
Controller 1, the arc suppression coil 2 for being connected to system neutral and system neutral is connected to by control switch 3
Grounding resistor 4.
In one implementation, described device further includes Z-type grounding transformer B.The Z-type grounding transformer B is used for
The system neutral is provided.
The controller 1 is used to disconnect the control switch 3 when power distribution network operates normally, monitor electric network capacitance and current,
And determine the assembled state of the adjustable condenser group C of arc suppression coil 2.
The controller 1 is also used to when singlephase earth fault occurs for power distribution network, according to the group of the adjustable condenser group C
The arc suppression coil 2 is adjusted to overcompensation state, and is greater than in advance in the duration that singlephase earth fault occurs for power distribution network by conjunction state
If when duration, being closed the control switch 3.
In the present embodiment, neutral grounding mode is more flexible, based on grounding through arc, while configuring one
Can switching grounding resistor, achieving the purpose that compensating electric capacity electric current, reducing overvoltage level and being grounded fault detection.
Below in conjunction with structural schematic diagram shown in FIG. 1, operated normally according to power grid, single-phase transient earthing event occurs for power distribution network
Single-phase three states of continuous earth failure occur for barrier and power distribution network, illustrate the working condition of the device respectively.
Firstly, controller 1 controls the work of arc suppression coil 2 in overcompensation state, and far from humorous when power distribution network operates normally
Vibration point.Control switch 3 is simultaneously switched off, keeps neutral point grounding resistor 4 out of service.Controller 1 passes through bus-bar potential transformer
PT, neutral point voltage mutual inductor PT0And neutral point current mutual inductor CT0, real-time monitoring electric network capacitance and current and power grid capacitor
Voltage judges whether power distribution network occurs singlephase earth fault according to electric network capacitance and current and power grid capacitance voltage, and according to predetermined
Tuning-off degree or ground connection residual flow value, determine the assembled state of the adjustable condenser group C of arc suppression coil, singlephase earth fault to be occurred
When tracing compensation.
When power distribution network residual voltage is more than setting valve, controller 1 determines that singlephase earth fault occurs, at this time controller 1
By preset gear, i.e., according to the assembled state of predetermined adjustable condenser group, arc suppression coil is adjusted to overcompensation
State.The failure initial stage, still to disconnect, neutral point does not put into grounding resistor, gives full play to arc suppression coil and connect control switch 3
Under ground mode, fault point aftercurrent is small, slows down failure mutually restores the effect of rate of voltage rise, be conducive to transient fault from
It is dynamic to disappear.
When power distribution network occur singlephase earth fault duration be greater than preset duration when, if power distribution network residual voltage still above
Setting valve, controller 1 determine that permanent earth fault occurs for power distribution network, at this point, closure control switch 3, puts into neutral ground
Resistor.If the ground fault of power distribution network is Xuhanting oral solution at this time, i.e., failure oneself through disappearing, the raising of residual voltage sheerly extinguishing arc
Caused by coil and zero sequence capacitor constitute industrial frequency resonance, the investment of grounding resistor can make power distribution network recover immediately normal condition；If
The failure is really permanent earth fault, what the investment of grounding resistor was beneficial to accumulate in release arc ignition extinguishing process
Excess charge eliminates intermittency electric arc's earthing over-voltage.
In one implementation, when singlephase earth fault has just occurred for power distribution network, controller 1 starts timing, works as distribution
The duration that singlephase earth fault occurs for net is greater than preset duration, and controller 1 is closed control switch 3, and stops timing.Wherein,
Preset duration needs according in practical application, and duration needed for arc suppression coil eliminates failure determines.
Neutral ground method switching device disclosed in the embodiment of the present application further includes failure line selection and locating module.
The failure line selection and locating module are used for after the control switch 3 closure, i.e. Neutral Grounding through Resistance in Electrical
Later, the zero sequence current mutual inductor CT by being mounted on each route1、CT2、…、CTn, fault message is obtained, and according to described
Fault message judges that the route to break down, the fault message include route zero-sequence current.Indicating fault on faulty line
Device can indicate fault section, and service personnel presses the signal of fault location indicator, fault point can be found, using on feeder line
Block switch realizes fault point isolation.
The embodiment of the present application discloses a kind of neutral grounding mode switching device, when power distribution network operates normally, control
Device disconnects the control switch of grounding resistor, determines the assembled state of the adjustable condenser group of arc suppression coil.It has just been sent out in power distribution network
When raw singlephase earth fault, arc suppression coil is adjusted to overcompensation state according to the assembled state of adjustable condenser group by controller,
Give full play under grounding through arc mode that fault point aftercurrent is small, slows down failure and mutually restore the effect of rate of voltage rise,
Transient fault is set to disappear automatically.When the duration that singlephase earth fault occurs for power distribution network is greater than preset duration, it is closed the control
System switch, while so that neutral point is passed through grounding through arc, grounded resistance-grounded system.Neutrality disclosed in the embodiment of the present application
Point earthing mode switching device, the advantages of capable of drawing through grounding through arc mode: single-phase earthing aftercurrent is small, sustainable
The advantages of powering, while drawing Neutral Grounding through Resistance in Electrical: overvoltage level is low, meets ground protection action sensitivity requirement,
Flexible neutral grounding mode is constructed, the deficiency through grounding through arc or the single method of operation of resistance grounded is made up, makes
It not only improves transient fault blow-out, and limitation even is eliminated the possibility that intermittent arc grounding and other resonance overvoltages occurs
Property, and it is convenient for the detection of permanent earth fault.Controller carries out calculating analysis to the measurement data of electric current, voltage transformer,
It can complete monitoring electric network capacitance and current, automatic adjustment arc suppression coil inductance, the switching for automatically controlling ground resistance and automatic
Select the functions such as faulty line.It is grounded the switching of resistance by full power electronic devices, adjusts arc suppression coil inductance, makes
The action sensitivity for obtaining the device improves, and is more conducive to the good operation of power distribution network.
Following is the application embodiment of the method, can be used for executing the application Installation practice.It is real for the application method
Undisclosed details in example is applied, the application embodiment of the method is please referred to.
In the application second embodiment, a kind of neutral grounding mode operation/cutting method is disclosed, this method is applied to this Shen
Please controller 1 in neutral grounding mode switching device disclosed in first embodiment, the neutral grounding mode switching dress
Setting further includes the ground connection electricity for being connected to the arc suppression coil 2 of system neutral and being connected to system neutral by control switch 3
Hinder device 4, which comprises
When power distribution network operates normally, the control switch 3 is disconnected, monitors electric network capacitance and current, and determine arc suppression coil 2
Adjustable condenser group C assembled state.
When singlephase earth fault occurs for power distribution network, according to the assembled state of the adjustable condenser group C, by the extinguishing arc
Coil 2 is adjusted to overcompensation state, and when the duration that singlephase earth fault occurs for power distribution network is greater than preset duration, described in closure
Control switch 3.
Further, the method also includes:
After control switch closure, failure line selection and locating module obtain fault message, and according to the failure
Information judges that the route to break down, the fault message include route zero-sequence current.
In the specific implementation, the application also provides a kind of computer storage medium, wherein the computer storage medium can store
There is program, which may include step some or all of in each embodiment provided by the present application when executing.The storage medium
It can be magnetic disk, CD, read-only memory (read-only memory, abbreviation ROM) or random access memory (random
Access memory, abbreviation RAM) etc..
In addition, the embodiment of the present application also provides a kind of computer program product comprising instruction, when its on computers
When operation, so that the computer some or all of executes in above-described embodiment the method step.
In the above-described embodiments, can come wholly or partly by software, hardware, firmware or any combination thereof real
It is existing.When implemented in software, it can entirely or partly be realized in the form of computer product.The computer program product
Including one or more computer instructions.It is all or part of when loading on computers and executing the computer program instructions
Ground is generated according to process or function described in the embodiment of the present application.The computer can be general purpose computer, special purpose computer,
Computer network or other programmable devices.The computer instruction may be stored in a computer readable storage medium, or
Person is transmitted from a computer readable storage medium to another computer readable storage medium, for example, the computer instruction
Can from a web-site, computer, server or data center by wired or wireless way to another web-site,
Computer, server or data center are transmitted.The computer readable storage medium can be what computer can access
Any usable medium either includes the data storage devices such as one or more usable mediums integrated server, data center.
The usable medium can be magnetic medium, (for example, floppy disk, hard disk, tape), optical medium (for example, DVD) or semiconductor
Medium (such as solid state hard disk) etc..
Combine detailed description and exemplary example that the application is described in detail above, but these explanations are simultaneously
It should not be understood as the limitation to the application.It will be appreciated by those skilled in the art that without departing from the application spirit and scope,
A variety of equivalent substitution, modification or improvements can be carried out to technical scheme and embodiments thereof, these each fall within the application
In the range of.The protection scope of the application is determined by the appended claims.
Claims (5)
1. a kind of neutral grounding mode switching device characterized by comprising controller is connected to disappearing for system neutral
Arc coil and the grounding resistor that system neutral is connected to by control switch；
The controller is used to disconnect the control switch, and determine the adjustable electric of arc suppression coil when power distribution network operates normally
The assembled state of container group；
The controller is also used to when singlephase earth fault occurs for power distribution network, according to the combination shape of the adjustable condenser group
The arc suppression coil is adjusted to overcompensation state by state, and when the duration that singlephase earth fault occurs for power distribution network is greater than default
When long, it is closed the control switch.
2. the apparatus according to claim 1, which is characterized in that described device further includes failure line selection and locating module；
The failure line selection and locating module are used for after control switch closure, obtain fault message, and according to described
Fault message judges that the route to break down, the fault message include route zero-sequence current.
3. the apparatus according to claim 1, which is characterized in that described device further includes grounding transformer；
The grounding transformer is used to provide the described system neutral.
4. a kind of neutral grounding mode operation/cutting method, which is characterized in that applied in neutral grounding mode switching device
Controller, the neutral grounding mode switching device, which further includes that claims 1 to 3 is described in any item, is connected to system neutrality
The arc suppression coil of point and the grounding resistor that system neutral is connected to by control switch, which comprises
When power distribution network operates normally, the control switch is disconnected, and determine the combination shape of the adjustable condenser group of arc suppression coil
State；
When singlephase earth fault occurs for power distribution network, according to the assembled state of the adjustable condenser group, by the arc suppression coil
It is adjusted to overcompensation state, and when the duration that singlephase earth fault occurs for power distribution network is greater than preset duration, is closed the control
Switch.
5. according to the method described in claim 4, it is characterized in that, the method also includes:
After control switch closure, failure line selection and locating module obtain fault message, and according to the fault message,
Judge the route to break down, the fault message includes route zero-sequence current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910352342.2A CN110247382A (en) | 2019-04-29 | 2019-04-29 | A kind of neutral grounding mode switching device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910352342.2A CN110247382A (en) | 2019-04-29 | 2019-04-29 | A kind of neutral grounding mode switching device and method |
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| Publication Number | Publication Date |
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| CN110247382A true CN110247382A (en) | 2019-09-17 |
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| CN201910352342.2A Pending CN110247382A (en) | 2019-04-29 | 2019-04-29 | A kind of neutral grounding mode switching device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114221319A (en) * | 2021-11-25 | 2022-03-22 | 江苏三得力电气有限公司 | Independent dynamic resistance control device and control method for system not directly connected to ground |
| WO2022121779A1 (en) * | 2020-12-12 | 2022-06-16 | 保定钰鑫电气科技有限公司 | Method for processing single-phase grounding |
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| CN103208788A (en) * | 2013-03-08 | 2013-07-17 | 李景禄 | Intelligent dynamic power distribution network neutral-point grounding method and complete device |
| CN104092206A (en) * | 2014-06-20 | 2014-10-08 | 国家电网公司 | Power distribution network grounding self-adaptive control system and method |
| CN109347074A (en) * | 2018-08-03 | 2019-02-15 | 张安斌 | A kind of neutral grounding mode switching method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2521811Y (en) * | 2002-01-24 | 2002-11-20 | 上海思源电气股份有限公司 | Shunt resistance type autoamtic tracking arc suppression compensating & select switch |
| CN103208788A (en) * | 2013-03-08 | 2013-07-17 | 李景禄 | Intelligent dynamic power distribution network neutral-point grounding method and complete device |
| CN104092206A (en) * | 2014-06-20 | 2014-10-08 | 国家电网公司 | Power distribution network grounding self-adaptive control system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022121779A1 (en) * | 2020-12-12 | 2022-06-16 | 保定钰鑫电气科技有限公司 | Method for processing single-phase grounding |
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Application publication date: 20190917 |