CN110086160A - A kind of residue current of ground fault in electrical removing method of neutral by arc extinction coil grounding system - Google Patents
A kind of residue current of ground fault in electrical removing method of neutral by arc extinction coil grounding system Download PDFInfo
- Publication number
- CN110086160A CN110086160A CN201910356814.1A CN201910356814A CN110086160A CN 110086160 A CN110086160 A CN 110086160A CN 201910356814 A CN201910356814 A CN 201910356814A CN 110086160 A CN110086160 A CN 110086160A
- Authority
- CN
- China
- Prior art keywords
- passive element
- ground fault
- fault
- failure
- neutral
- 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.)
- Granted
Links
Classifications
-
- 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
Abstract
The invention discloses a kind of residue current of ground fault in electrical removing methods of neutral by arc extinction coil grounding system, comprising: step 100, measurement distribution system three-phase voltage and residual voltage detect ground fault and failure phase；When step 200, ground fault occur, a passive element is put into the lag phase of failure phase, failure residual flow is suppressed to zero；One section of step 300, delay setting time, change the value of investment passive element, if residual voltage shows that ground fault has been eliminated by corresponding rule variation, then exit the passive element of investment, recovery system operates normally；Otherwise it is determined as permanent earth fault, return step 200；When ground fault occurs, failure residual flow can be inhibited to zero by putting into a passive element, the passive element value is unrelated with ground resistance, the only relating to parameters with system itself, therefore inhibitory effect is not influenced by fault resstance, and inhibitory effect is good, with operation is simple and reliable, feature easy to adjust, low in cost.
Description
Technical field
The present invention relates to power distribution system technology field, the ground connection event of specially a kind of neutral by arc extinction coil grounding system
Hinder residual flow removing method.
Background technique
That structure is complicated is changeable for distribution system, contacts closely with user, and random fault easily occurs, wherein about 70% failure
For instantaneity ground fault, earth-fault current suppression technology is a difficult point and hot issue for distribution system research.
To limit earth-fault current, China's distribution system generally uses neutral by arc extinction coil grounding mode, passes through
Capacitance current in compensation of ground electric current inhibits earth-fault current, realizes that distribution system tape jam is run in short-term.But with
The increase of cable system and a large amount of accesses of nonlinear-load and power electronic equipment, containing a large amount of active in fault current
Component and harmonic component, and traditional arc suppression coil can only compensate the reactive component in fault current, cannot compensate its active point
(accounting for about 2%~8%) and harmonic component (accounting for about 5%) are measured, part distribution net work earthing fault electric current is through arc suppression coil compensation capacitor
Tens amperes are still up to after component, it is sufficient to which pilot arc burning does not meet the requirement of power grid regulation operation, and for insulation fault
Caused intermittent arc grounding failure is helpless, and inhibitory effect is limited, and is also easy to produce arc overvoltage, maximum up to volume
7 times of constant voltage are easy to burn high-voltage electrical equipment, or even cause and burn accident of operating, and cause large-area power-cuts.
Inhibit the active arc extinguishing method of fault current and voltage for this purpose, beginning one's study both at home and abroad, such as Sweden in 2015
" the full compensation technique of ground fault neutralizer and application " text that Swedish Neutral company delivers, discloses a kind of active
Electric current arc extinguishing method: when ground fault occurs, to be grounded residual flow as control target, electricity is injected toward neutral point by residual flow compensator
Stream, compensation of ground failure total current (including reactive component and active component residual flow) thus reach complete inhibition ground fault electricity
The target of stream.Since failure residual flow can not be measured directly and the difficulty of route zero-sequence circulating current component precise measurement, with ground connection
Residual flow is control target, can not equally inhibit intermittent arc grounding failure, and with high costs, and the price of set of device is up to 400
Wan Yuan, this method are difficult to practical application.
Patent of invention " a kind of distribution network ground fault arc extinction and guard method (number of patent application 201110006701.2) "
Disclose a kind of distribution network ground fault arc extinction and guard method, this method by injecting a constant current to power distribution network, force therefore
Hinder that phase voltage is zero and earth-fault current is zero, it can be achieved that 100% extinguishing arc of transient fault and quickly isolating for permanent fault,
Solves the deficiency that traditional neutral point grounding technology inhibits fault current.But this method is needed by power electronic equipment to distribution
Net Injection Current, it is with high costs, and it is difficult to control accurately the amplitude and phase of Injection Current, inhibitory effect is difficult to ensure.
In summary, distribution system power supply reliability, safety and economy be cannot be considered in terms of in the prior art.
Summary of the invention
In order to overcome the shortcomings of that prior art, the present invention provide a kind of connecing for neutral by arc extinction coil grounding system
Earth fault residual flow removing method can effectively solve the problem of background technique proposes.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of residue current of ground fault in electrical removing method of neutral by arc extinction coil grounding system, which is characterized in that including such as
Lower step:
Step 100, measurement distribution system three-phase voltage and residual voltage, detect ground fault and failure phase；
Step 200, when ground fault occur when, in the lag phase of failure phase put into a passive element, failure is residual
Stream is suppressed to zero；
One section of step 300, delay setting time, change the value of investment passive element, if residual voltage is by corresponding rule
Variation, then show that ground fault has been eliminated, then exits the passive element of investment, and recovery system operates normally；Otherwise it is determined as forever
Long property ground fault, return step 200.
As a preferred technical solution of the present invention, in step 200, the passive element is by a resistance and one
Capacitor composes in parallel.
As a preferred technical solution of the present invention, resistance R in the passive elementmWith capacitor CmExpression
Are as follows:
Wherein, ro、C0System is respectively indicated to ground resistance and capacitor, L is arc suppression coil inductance, and w is system angular frequency.
As a preferred technical solution of the present invention, in step 300, the relationship between residual voltage and passive element
Are as follows:
Wherein, Csm、RsmThe respectively setting value of passive element,To put into the system residual voltage after passive element,For the system power source voltage after investment passive element, j is system angular speed.
As a preferred technical solution of the present invention, the setting time is 0.2 second to 15 seconds.
Compared with prior art, the beneficial effects of the present invention are:
(1) when ground fault occurs, failure residual flow can be pressed down by mutually putting into a passive element by the lag in failure phase
For system to zero, the deficiency of watt current cannot be compensated by compensating for traditional arc suppression coil, be obviously improved fault point person equipment safety
Level, and improve power supply reliability.
(2) it is unrelated with ground resistance in failure mutually to lag the passive element value that mutually puts by the present invention, with system itself
Relating to parameters, therefore inhibitory effect is not influenced by fault resstance, inhibitory effect is good.
(3) compared with using method of the method to system Injection Current to inhibit fault current, present invention only requires
The lag of failure phase, which mutually puts into a passive element, to be suppressed to zero for failure residual flow, and operation is simple and reliable, passive element volume
It is small, easy to adjust and low in cost, there is preferable economy.
(4) present invention has combined power supply reliability, safety and economy, with high real-time and realizes simplicity
Advantage.
Detailed description of the invention
Fig. 1 is flow diagram of the present invention；
Fig. 2 is the electric current phasor figure that passive element of the present invention flows through；
Fig. 3 is that neutral by arc extinction coil grounding system earth failure residual flow of the present invention eliminates schematic diagram；
Fig. 4 is residue current of ground fault in electrical inhibition dynamic waveform figure under the conditions of 100 ohm of ground fault resistances of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of residue current of ground fault in electrical removing methods of neutral by arc extinction coil grounding system, including such as
Lower step:
Step 100, measurement distribution system three-phase voltage and residual voltage, detect ground fault and failure phase；
Step 200, when ground fault occur when, in the lag phase of failure phase put into a passive element, failure is residual
Stream is suppressed to zero；
One section of step 300, delay setting time, the setting time are 0.2 second to 15 seconds, change investment passive element
Value, if residual voltage is shown that ground fault has been eliminated, then exit the passive element of investment, restored by corresponding rule variation
System operates normally；Otherwise it is determined as permanent earth fault, return step 200.
In step 200, the passive element is composed in parallel by a resistance and a capacitor.The value of passive element with connect
Ground resistance is unrelated, only the relating to parameters with system itself, resistance R in the passive elementmWith capacitor CmExpression are as follows:
Wherein, ro、C0System is respectively indicated to ground resistance and capacitor, L is arc suppression coil inductance, and w is system angular frequency.
In step 300, the relationship between residual voltage and passive element are as follows:
Wherein, Csm、RsmThe respectively setting value of passive element,To put into the system residual voltage after passive element,For the system power source voltage after investment passive element, j is system angular speed.
As shown in Figure 1, schematic diagram is eliminated for neutral by arc extinction coil grounding system earth failure residual flow,
For system power source voltage, wherein three-phase voltage is equal in magnitude, and direction successively differs 120 °, r0、C0System is respectively indicated to ground resistance
And capacitor, when neutral point N is through grounding through arc, arc suppression coil inductance is L, Rm, CmFor the resistance and capacitor in passive element.
If singlephase earth fault, fault resstance R occur for A phasef, residual voltage isIt is right before passive element investment
System neutral N column, which write node voltage equation, to be had:
Wherein,
Above formula simplification is obtained:
Faulted phase voltage at this time are as follows:
Fault current can be solved by combining above-mentioned two formula are as follows:
After ground fault generation, outer between the lag phase and ground of a failure phase plus passive element is (by resistance and electricity
Appearance composes in parallel), the inhibition for being grounded failure residual flow by regulating and controlling residual voltage.If the residual voltage after compensating element, investment
ForThen have:
Simplified:
It enables in above formulaIt can make faulted phase voltage zero, so that fault current is zero.
In addition will
And it enablesR at this timem, CmIt should meet:
When the parameter of passive element meets above formula, faulted phase voltageThe voltage of system B phase at this time are as follows:
The electric current for flowing through passive element at this time is to flow through resistance RmElectric current and flow through capacitor CmElectric current superposition:
Known to joint above formula:
Phase voltage can be drawn according to above formulaThe electric current phasor figure generated on passive element, as shown in Fig. 2, in figureIt is capacitor CmThe electric current that branch generates,It is resistance RmThe electric current that branch generates,It isWithVector sum.
From the above equation, we can see that fault current of the passive element when with A phase singlephase earth fault occurs for the electric current that B phase generates is big
It is small equal, i.e., just realize the elimination of residue current of ground fault in electrical.
From the above equation, we can see that residual voltage and passive element R when system non-failuremAnd CmIt is corresponding, relational expression such as following formula institute
Show:
C in formulasm, RsmFor the setting value of passive element.
Therefore, it can judge whether ground fault has been eliminated by changing passive element value after putting into passive element: if
Change passive element value, the changing rule of residual voltage such as above formula then judges that ground fault has been eliminated, otherwise can determine whether to be permanent
Property ground fault.
Fig. 3 is flow chart of the invention.Measuring system three-phase voltage and residual voltage first detect ground fault and failure
Phase；When ground fault occurs, a passive element is mutually put into the lag of failure phase, failure residual flow is suppressed to zero；Delay one
The section time changes the value of investment passive element, if system residual voltage shows that ground fault has disappeared by corresponding rule variation
It removes, exits the passive element of investment, recovery system operates normally；Otherwise it is judged as permanent earth fault, readjusts passive
Failure residual flow is suppressed to zero by component value, until isolated fault route, recovery system is operated normally.
Arc suppression coil earthing system residue current of ground fault in electrical shown in FIG. 1, which is built, using PSCAD eliminates simulation model, arc blowout wire
Circle inductance value is L=0.25H, and system direct-to-ground capacitance is C0=10 μ F, system are r to ground resistance0=10k Ω.If system A phase is sent out
Raw singlephase earth fault, 100 Ω of fault resstance put into passive element in the lag phase B phase of failure phase, and passive element value presses above formula
Formula setting, then have: Cm=5.56 μ F, RmOccurs for=1239.16 Ω, setting ground fault for 0.02s the moment, and passive element exists
0.04s investment, Fig. 4 is that ground fault resistance is the corresponding failure residual flow waveform diagram of 100 Ω.As shown in Figure 4, when the passive member of investment
After part (0.04s), failure residual flow is quickly suppressed to zero, realizes neutral by arc extinction coil grounding system earth failure residual flow
Elimination.
As shown above, it to verify the content of present invention to the validity of low resistance failure and high resistance failure, successively emulates
When fault resstance value is respectively 8 Ω, 25 Ω, 100 Ω, 1000 Ω (ground fault occurs for A phase), the failure generation moment is 0.02s,
Passive element is put into 0.04s, and the simulation result for obtaining the fault current of passive element investment correspondence summarizes table institute as above
Show, from the data in the table, the content of present invention is not influenced the inhibitory effect of failure residual flow by fault resistance, is connect
Passive element is put into after earth fault can fast implement the inhibition of failure residual flow, be grounded the elimination of failure residual flow.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
Claims (5)
1. a kind of residue current of ground fault in electrical removing method of neutral by arc extinction coil grounding system, which is characterized in that including as follows
Step:
Step 100, measurement distribution system three-phase voltage and residual voltage, detect ground fault and failure phase；
Step 200, when ground fault occur when, in the lag phase of failure phase put into a passive element, failure residual flow is pressed down
It makes to zero；
One section of step 300, delay setting time, change the value of investment passive element, if residual voltage presses corresponding rule variation,
Then show that ground fault has been eliminated, then exit the passive element of investment, recovery system operates normally；Otherwise it is judged to permanently connecing
Earth fault, return step 200.
2. a kind of residue current of ground fault in electrical removing method of neutral by arc extinction coil grounding system according to claim 1,
It is characterized in that, in step 200, the passive element is composed in parallel by a resistance and a capacitor.
3. a kind of residue current of ground fault in electrical removing method of neutral by arc extinction coil grounding system according to claim 2,
It is characterized in that, resistance R in the passive elementmWith capacitor CmExpression are as follows:
Wherein, r0、C0System is respectively indicated to ground resistance and capacitor, L is arc suppression coil inductance, and w is system angular frequency.
4. a kind of residue current of ground fault in electrical removing method of neutral by arc extinction coil grounding system according to claim 3,
It is characterized in that, in step 300, the relationship between residual voltage and passive element are as follows:
Wherein, Csm、RsmThe respectively setting value of passive element,To put into the system residual voltage after passive element,For
System power source voltage after putting into passive element, j are system angular speed.
5. a kind of residue current of ground fault in electrical removing method of neutral by arc extinction coil grounding system according to claim 1,
It is characterized in that, the setting time is 0.2 second to 15 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910356814.1A CN110086160B (en) | 2019-04-29 | 2019-04-29 | Method for eliminating residual current of ground fault of neutral point arc suppression coil grounding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910356814.1A CN110086160B (en) | 2019-04-29 | 2019-04-29 | Method for eliminating residual current of ground fault of neutral point arc suppression coil grounding system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110086160A true CN110086160A (en) | 2019-08-02 |
| CN110086160B CN110086160B (en) | 2021-05-14 |
Family
ID=67417784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910356814.1A Active CN110086160B (en) | 2019-04-29 | 2019-04-29 | Method for eliminating residual current of ground fault of neutral point arc suppression coil grounding system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110086160B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820620A (en) * | 2021-08-17 | 2021-12-21 | 捍防（深圳）实业有限公司 | Fault analysis method and fault analysis device for power supply system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2390339Y (en) * | 1999-08-04 | 2000-08-02 | 张旭辉 | Earthing compensation and single phase earthing fast detecting and removing device |
| CN101055986A (en) * | 2007-05-10 | 2007-10-17 | 济南大学 | Stable status zero-sequence current increase and assistance device and method |
| CN201075681Y (en) * | 2007-08-10 | 2008-06-18 | 吴勇 | 3-3.5kV neutral point non-effective grounding system for fast extinguishing arc and extinguishing humorous and over-voltage protection device |
| CN102593808A (en) * | 2012-03-23 | 2012-07-18 | 上海市电力公司 | System for grounding neutral point by using combination of reactor and resistors |
| CN204216583U (en) * | 2014-10-16 | 2015-03-18 | 马俊杰 | Based on the colliery compensation arrangement of voltage-source type arc-suppression coil with magnetic bias |
| CN206533136U (en) * | 2016-12-20 | 2017-09-29 | 大连电力勘察设计院有限公司 | 220kV transformer stations arc suppression coil parallel low resistance earthed system |
-
2019
- 2019-04-29 CN CN201910356814.1A patent/CN110086160B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2390339Y (en) * | 1999-08-04 | 2000-08-02 | 张旭辉 | Earthing compensation and single phase earthing fast detecting and removing device |
| CN101055986A (en) * | 2007-05-10 | 2007-10-17 | 济南大学 | Stable status zero-sequence current increase and assistance device and method |
| CN201075681Y (en) * | 2007-08-10 | 2008-06-18 | 吴勇 | 3-3.5kV neutral point non-effective grounding system for fast extinguishing arc and extinguishing humorous and over-voltage protection device |
| CN102593808A (en) * | 2012-03-23 | 2012-07-18 | 上海市电力公司 | System for grounding neutral point by using combination of reactor and resistors |
| CN204216583U (en) * | 2014-10-16 | 2015-03-18 | 马俊杰 | Based on the colliery compensation arrangement of voltage-source type arc-suppression coil with magnetic bias |
| CN206533136U (en) * | 2016-12-20 | 2017-09-29 | 大连电力勘察设计院有限公司 | 220kV transformer stations arc suppression coil parallel low resistance earthed system |
Non-Patent Citations (1)
| Title |
|---|
| 杨磊 等: ""新型谐振接地系统接地故障全补偿方法"", 《电力自动化设备》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820620A (en) * | 2021-08-17 | 2021-12-21 | 捍防（深圳）实业有限公司 | Fault analysis method and fault analysis device for power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110086160B (en) | 2021-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107276097B (en) | Non-effectively earthed system earth fault is mutually depressured the method for safe operation of extinguishing arc | |
| CN104218563B (en) | The distribution network failure arc extinguishing method that a kind of neutral point is grounded through Multilevel Inverters | |
| Ghorbani et al. | Impact of SVC on the protection of transmission lines | |
| CN102074950B (en) | Distribution network ground fault arc extinction and protection method | |
| Ha et al. | Novel scheme of travelling wave based differential protection for bipolar HVDC transmission lines | |
| CN106602540A (en) | Active voltage arc-extinction method applicable to single-phase earth fault of medium voltage distribution network | |
| CN105322528A (en) | Injection current two-point calculation method during small-current grounding fault active arc extinguishing | |
| CN107276082B (en) | Active voltage reduction safe operation method for ground fault phase of non-effective grounding system | |
| Chao et al. | Adaptive distance protection based on the analytical model of additional impedance for inverter-interfaced renewable power plants during asymmetrical faults | |
| CN103207354A (en) | Maximum line selection coefficient principle based single-phase earth fault line selection method for power distribution network | |
| Gargoom et al. | Residual current compensator based on voltage source converter for compensated distribution networks | |
| CN207705796U (en) | A kind of multifunctional ligand power grid flexible ground device | |
| Qi et al. | Fast disposal method for reducing electricity risk of single-phase ground fault in distribution network | |
| CN113514730A (en) | Power distribution network high-resistance grounding fault line selection method based on neutral point power frequency zero-sequence current injection | |
| Wang et al. | Adaptive reclosing strategy for single outgoing line of converter-interfaced wind park using distance relaying algorithm | |
| Cho et al. | A novel fault-location algorithm for AC parallel autotransformer feeding system | |
| CN110086160A (en) | A kind of residue current of ground fault in electrical removing method of neutral by arc extinction coil grounding system | |
| CN205583702U (en) | Novel reactive compensation device | |
| Feng et al. | Impact of inverter interfaced generators on distance protection | |
| CN115622015A (en) | Active arc extinction method based on parameter measurement of power distribution network after fault | |
| CN110912102A (en) | Low-voltage power supply network leakage fault protection method based on zero phase transfer | |
| Wang et al. | A novel directional element for transmission line connecting inverter-interfaced renewable energy power plant | |
| Wang et al. | Flexible grounding control strategy based on proportional series inertial control for distribution networks | |
| CN113452014B (en) | Accurate and rapid suppression method for unbalanced zero sequence voltage of power distribution network | |
| Zhou et al. | Energy-based directional pilot protection for distribution networks with IBDGs considering unmeasured load switching |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |