CN109613392A - A kind of fault phase-selecting method and system based on current change quantity - Google Patents
A kind of fault phase-selecting method and system based on current change quantity Download PDFInfo
- Publication number
- CN109613392A CN109613392A CN201811369415.0A CN201811369415A CN109613392A CN 109613392 A CN109613392 A CN 109613392A CN 201811369415 A CN201811369415 A CN 201811369415A CN 109613392 A CN109613392 A CN 109613392A
- Authority
- CN
- China
- Prior art keywords
- phase
- overcurrent
- sections
- current
- definite value
- 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.)
- Pending
Links
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
Abstract
The present invention provides a kind of fault phase-selecting method and system based on current change quantity, when route does not need distance protection or has overcurrent overload apolegamy function, due to definite value not relevant to distance protection, route positive sequence impedance definite value, zero sequence impedance definite value, positive sequence fineness angle, zero sequence fineness angle, the definite values such as line length shield, traditional steady-state quantity phase selection and voltage variety phase selection is no longer applicable in, therefore, when route is without distance protection, for failure in non-oscillatory, Fault Phase Selection can correctly can be carried out in the case where no distance protection or in the case where overcurrent overload apolegamy function by increasing overcurrent phase-selecting function, failure is still leaned in oscillationCosine half cycle phase selection obtains phase selection as a result, either oscillation fault or non-oscillatory failure, method of the invention are all suitable for.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System field, in particular to a kind of failure choosing based on current change quantity
Phase method and system.
Background technique
Grid-connected power generation system accesses after power grid, due to the strong nonlinearity of power electronic equipment control system, and compared with
, there is defective device output current limited in the ability of weak tolerance short circuit current, and frequency shift (FS) etc. is different from traditional power grid
Fault signature.Conventional current protection cannot be met the requirements under the conditions of this, and pilot protection is since expensive price is in interconnection
Seeming when shorter, cost is excessively high, and distance protection at this time becomes the optimal selection of interconnector main protection.
Distance protection has protection zone stabilization, not by system operation mode etc. as a kind of electrical Non-unit protection
The advantages of factor influences.Domestic and foreign scholars propose the new principle of a variety of distance protections, such as measurement impedance method, the solution differential equation
Method and the methods of the distance protection for utilizing voltage's distribiuting.Due to transmission line malfunction phase selection correctness be related to transmission line of electricity away from
Whether from protection and the correct movement of auto recloser, to reinforcement relay protection of transmission line Reliability of Microprocessor and correctness
With highly important influence.Distance protection includes distance protection and without distance protection, wherein has distance protection using tradition
Steady-state quantity phase selection and quick-action section phase selection.When no distance protection, due to positive sequence impedance definite value, positive sequence fineness angle, zero in route
Sequence impedance definite value, zero sequence fineness angle, line length, ground distance definite value, ground distance time, phase spacing definite value, phase spacing
It is shielded from definite values such as time, alternate extra segment definite value, alternate extra segment time, Load Limiting Resistor zero-utility theories, because
This, cannot be by way of having distance protection to no distance protection phase selection.
Summary of the invention
The purpose of the present invention is to provide a kind of fault phase-selecting method and system based on current change quantity, it is existing for solving
There is in technology the problem of having distance fault phase selection scheme not applicable without distance protection Fault Phase Selection.
To achieve the above object, the present invention provides a kind of fault phase-selecting method based on current change quantity, including it is as follows
Step:
If non-oscillatory failure occurs for electric system, phase current is acquired, judges the phase current and overcurrent I sections of definite value, overcurrent II
Relationship between section definite value, III sections of definite values of overcurrent or overcurrent accelerating sections definite value is sentenced if the phase current is greater than overcurrent I sections of definite value
Breaking, this mutually breaks down at I sections of overcurrent；If the phase current is greater than overcurrent II sections of definite value, judge this mutually in II sections of generations events of overcurrent
Barrier；If the phase current is greater than overcurrent III sections of definite value, judge that this mutually breaks down at III sections of overcurrent；If the phase current was greater than
Accelerating sections definite value is flowed, then judges that this mutually breaks down in overcurrent accelerating sections；The phase current include monophase current, three-phase current and
Three-phase current；
If oscillation fault occurs for electric system, acquisition zero-sequence current phase and negative-sequence current phase carry out failure constituency, into
One step utilizesPhase selection is carried out, ifThe voltage range for meeting setting, then judge that this mutually breaks down,It is single-phase
Phase angle or alternate phase angle, U are corresponding phase voltage or voltage between phases.
When route does not need distance protection or has overcurrent overload apolegamy function, due to not related to distance protection
The definite values such as definite value, route positive sequence impedance definite value, zero sequence impedance definite value, positive sequence fineness angle, zero sequence fineness angle, line length shield
It covers, traditional steady-state quantity phase selection is no longer applicable in, and when route is without distance protection, increasing overcurrent phase-selecting function can have the present invention
Fault Phase Selection can be correctly carried out in the case where no distance protection or in the case where overcurrent overload apolegamy function, is either shaken
Failure or non-oscillatory failure are swung, method of the invention is all suitable for.
The Fault Phase Selection system based on current change quantity that the present invention also provides a kind of, including memory, processor and
Storage on a memory and computer program when can run on a processor, when the processor executes described program realization with
Lower step:
If non-oscillatory failure occurs for electric system, phase current is acquired, judges the phase current and overcurrent I sections of definite value, overcurrent
Relationship between II sections of definite values, III sections of definite values of overcurrent or overcurrent accelerating sections definite value, if the phase current is greater than overcurrent I sections of definite value,
Judge that this mutually breaks down at I sections of overcurrent；If the phase current is greater than overcurrent II sections of definite value, judge that this mutually occurs at II sections of overcurrent
Failure；If the phase current is greater than overcurrent III sections of definite value, judge that this mutually breaks down at III sections of overcurrent；If the phase current is greater than
Overcurrent accelerating sections definite value then judges that this mutually breaks down in overcurrent accelerating sections；The phase current includes monophase current, three-phase current
And three-phase current；
If oscillation fault occurs for electric system, acquisition zero-sequence current phase and negative-sequence current phase carry out failure constituency, into
One step utilizesPhase selection is carried out, ifThe voltage range for meeting setting, then judge that this mutually breaks down,It is single-phase
Phase angle or alternate phase angle, U are corresponding phase voltage or voltage between phases.
When route does not need distance protection or has overcurrent overload apolegamy function, due to not related to distance protection
The definite values such as definite value, route positive sequence impedance definite value, zero sequence impedance definite value, positive sequence fineness angle, zero sequence fineness angle, line length shield
It covers, traditional steady-state quantity phase selection is no longer applicable in, and when route is without distance protection, increasing overcurrent phase-selecting function can have the present invention
Fault Phase Selection can be correctly carried out in the case where no distance protection or in the case where overcurrent overload apolegamy function, is either shaken
Failure or non-oscillatory failure are swung, method of the invention is all suitable for.
Detailed description of the invention
Fig. 1 is NETWORK STRUCTURE PRESERVING POWER SYSTEM schematic diagram of the invention；
Fig. 2 is the fault phase-selecting method flow chart that no distance of the invention has overcurrent protection.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing:
The present invention provides a kind of fault phase-selecting methods based on current change quantity, and non-oscillatory failure occurs in electric system
When, phase current is acquired, judges that the phase current and overcurrent I sections of definite value, II sections of definite values of overcurrent, III sections of definite values of overcurrent or overcurrent accelerate
Relationship between section definite value judges that this mutually breaks down at I sections of overcurrent if the phase current is greater than overcurrent I sections of definite value；If the phase
Electric current is greater than overcurrent II sections of definite value, then judges that this mutually breaks down at II sections of overcurrent；Determine if the phase current is greater than overcurrent III sections
Value, then judge that this mutually breaks down at III sections of overcurrent；If the phase current is greater than overcurrent accelerating sections definite value, judge this mutually in mistake
Stream accelerating sections breaks down；Wherein, phase current includes monophase current, three-phase current and three-phase current；It shakes in electric system
When swinging failure, acquisition zero-sequence current phase and negative-sequence current phase carry out failure constituency, further utilizePhase selection is carried out,
IfThe voltage range for meeting setting, then judge that this mutually breaks down,For single-phase phase angle or alternate phase angle, U is to correspond to
Phase voltage or voltage between phases.
Above-mentioned electric current and voltage is acquired by corresponding current transformer and voltage transformer, electric power as shown in Figure 1
System structure diagram includes threephase current transformer TA1, TA2, TA3, threephase potential transformer TV1, TV2, TV3 in figure；It is logical
Threephase current transformer TA1 is crossed, TA2, TA3 obtain route phase current, obtain line by threephase potential transformer TV1, TV2, TV3
Road phase voltage.No distance protection and there is distance protection fault phase-selecting method as shown in Figure 2.
When without distance protection, route positive sequence impedance definite value, positive sequence fineness angle, zero sequence impedance definite value, zero sequence in electric system
It is fineness angle, line length, ground distance definite value, the ground distance time, phase spacing definite value, the phase spacing time, alternate additional
The definite values such as section definite value, alternate extra segment time, Load Limiting Resistor, zero-utility theory shield, therefore are identified by definite value
Whether there is or not distance protections.
When without distance protection, if non-oscillatory failure occurs for electric system, Fault Phase Selection is carried out by overcurrent protection, when certain phase
When electric current meets I sections of definite values of overcurrent, then certain phase is selected for overcurrent I sections, i.e., this mutually breaks down at I sections of overcurrent；When certain phase current meets
When II sections of definite values of overcurrent, then certain phase is selected for overcurrent II sections, i.e., this mutually breaks down at II sections of overcurrent；When certain phase current meets overcurrent
When III sections of definite values, then certain phase is selected for overcurrent III sections, i.e., this mutually breaks down at III sections of overcurrent；Add when certain phase current meets overcurrent
When fast section definite value, then overcurrent accelerating sections selects certain phase, i.e., this mutually breaks down in overcurrent accelerating sections, discriminant equation are as follows:
Wherein,For any phase current, IsetFor III sections of definite values of II sections of definite values of I sections of definite values of overcurrent or overcurrent or overcurrent or mistake
Flow accelerating sections definite value.
Specifically, then A phase is selected for overcurrent I sections when A phase current meets I sections of definite values of overcurrent, when A phase current meets overcurrent II
When section definite value, then selects A phase for overcurrent II sections, when A phase current meets III sections of definite values of overcurrent, then A phase is selected for overcurrent III sections, when A phase
When electric current meets overcurrent accelerating sections definite value, then overcurrent accelerating sections selects A phase.
When B phase current meets I sections of definite values of overcurrent, then B phase is selected for overcurrent I sections, when B phase current meets II sections of definite values of overcurrent
When, then it selects B phase for overcurrent II sections, when B phase current meets III sections of definite values of overcurrent, then selects B phase for overcurrent III sections, when B phase current is full
When sufficient overcurrent accelerating sections definite value, then overcurrent accelerating sections selects B phase.
When C phase current meets I sections of definite values of overcurrent, then C phase is selected for overcurrent I sections, when C phase current meets II sections of definite values of overcurrent
When, then it selects C phase for overcurrent II sections, when C phase current meets III sections of definite values of overcurrent, then selects C phase for overcurrent III sections, when C phase current is full
When sufficient overcurrent accelerating sections definite value, then overcurrent accelerating sections selects C phase.
Fault Phase Selection, which only meets delay time in overcurrent condition, just has phase selection as a result, therefore before overcurrent phase selection result
It puts, it is also necessary to have overcurrent protection movement that can just obtain Fault Phase Selection as a result, differentiating process are as follows:
I sections of overcurrent are selected A phase and I sections of overcurrent movements, and II sections of overcurrent are selected A phase and II sections of overcurrent movements, and III sections of overcurrent are selected A phase
And III sections of overcurrent movements, overcurrent accelerating sections definite value selects A phase and overcurrent accelerating sections acts, the event as long as meeting one of condition
Barrier phase selection result is A phase.
I sections of overcurrent are selected B phase and I sections of overcurrent movements, and II sections of overcurrent are selected B phase and II sections of overcurrent movements, and III sections of overcurrent are selected B phase
And III sections of overcurrent movements, overcurrent accelerating sections definite value selects B phase and overcurrent accelerating sections acts, the event as long as meeting one of condition
Barrier phase selection result is B phase.
I sections of overcurrent are selected C phase and I sections of overcurrent movements, and II sections of overcurrent are selected C phase and II sections of overcurrent movements, and III sections of overcurrent are selected C phase
And III sections of overcurrent movements, overcurrent accelerating sections definite value selects C phase and overcurrent accelerating sections acts, the event as long as meeting one of condition
Barrier phase selection result is C phase.
When without distance protection, failure in oscillation is still usedPhase selection first uses zero-sequence current phase and negative-sequence current
Then phase is carried out compared to constituency is carried outPhase selection,Using half cycle algorithm, phase selection speed, discriminant equation are improved
Are as follows:
Wherein,For UCOSA, UCOSB, UCOSC, UCOSAB, UCOSCA, UCOSBC, when certain mutually meets above formula, then
This is mutually failure phase.
Explanation, no distance protection Fault Phase Selection is mainly unfolded in the present embodiment based on the fault phase-selecting method of no distance protection
Method is to carry out simulating, verifying without distance by moving die system by increasing overcurrent phase selection logic in line protective devices program
Fault Phase Selection result when protecting or having overcurrent overload apolegamy function.By the different faults such as K2, K3, K4 point carry out it is single-phase,
Alternate, three-phase fault checks the Fault Phase Selection result in Trouble Report.
When electric system occur non-oscillatory failure, i.e., when whether there is or not distance protection correlation definite value or have overcurrent overload match function
When energy, if fault point occurs in K2, A phase is grounded transient fault, B phase is grounded transient fault, C phase is grounded instantaneously for generation respectively
Property failure, the alternate transient fault of AB, the alternate transient fault of BC, the alternate transient fault of CA, ABN phase indirectly instantaneity therefore
Barrier, BCN phase transient fault, CAN phase transient fault, ABC three-phase transient fault indirectly indirectly, in action report
Fault Phase Selection result is respectively A phase, B phase, C phase, AB phase, BC phase, CA phase, AB phase, BC phase, CA phase, ABC phase.
When no distance protection has related definite value or has overcurrent overload apolegamy function, if fault point occurs in K3, respectively
A phase is grounded transient fault, B phase is grounded transient fault, C phase is grounded the alternate transient fault of transient fault, AB, BC for generation
The alternate transient fault of alternate transient fault, CA, ABN phase indirectly transient fault, BCN phase indirectly transient fault,
CAN phase transient fault, ABC three-phase transient fault indirectly, the Fault Phase Selection result in action report is respectively A phase, B
Phase, C phase, AB phase, BC phase, CA phase, AB phase, BC phase, CA phase, ABC phase.
When no distance protection has related definite value or has overcurrent overload apolegamy function, if fault point occurs in K4, respectively
A phase is grounded transient fault, B phase is grounded transient fault, C phase is grounded the alternate transient fault of transient fault, AB, BC for generation
The alternate transient fault of alternate transient fault, CA, ABN phase indirectly transient fault, BCN phase indirectly transient fault,
CAN phase transient fault, ABC three-phase transient fault indirectly, the Fault Phase Selection result in action report is respectively A phase, B
Phase, C phase, AB phase, BC phase, CA phase, AB phase, BC phase, CA phase, ABC phase.
When no distance protection has related definite value or has overcurrent overload apolegamy function, fault point occurs in system oscillation
K2, A phase is grounded transient fault, B phase is grounded transient fault, C phase is grounded the alternate instantaneity of transient fault, AB for generation respectively
Transient fault, BCN phase are indirectly instantaneous indirectly for the alternate transient fault of failure, BC, the alternate transient fault of CA, ABN phase
Property failure, CAN phase transient fault, ABC three-phase transient fault indirectly, the Fault Phase Selection result in action report are respectively
A phase, B phase, C phase, AB phase, BC phase, CA phase, AB phase, BC phase, CA phase, ABC phase.
When no distance protection has related definite value or has overcurrent overload apolegamy function, fault point occurs in system oscillation
K3, A phase is grounded transient fault, B phase is grounded transient fault, C phase is grounded the alternate instantaneity of transient fault, AB for generation respectively
Transient fault, BCN phase are indirectly instantaneous indirectly for the alternate transient fault of failure, BC, the alternate transient fault of CA, ABN phase
Property failure, CAN phase transient fault, ABC three-phase transient fault indirectly, the Fault Phase Selection result in action report are respectively
A phase, B phase, C phase, AB phase, BC phase, CA phase, AB phase, BC phase, CA phase, ABC phase.
When no distance protection has related definite value or has overcurrent overload apolegamy function, fault point occurs in system oscillation
K4, A phase is grounded transient fault, B phase is grounded transient fault, C phase is grounded the alternate instantaneity of transient fault, AB for generation respectively
Transient fault, BCN phase are indirectly instantaneous indirectly for the alternate transient fault of failure, BC, the alternate transient fault of CA, ABN phase
Property failure, CAN phase transient fault, ABC three-phase transient fault indirectly, the Fault Phase Selection result in action report are respectively
A phase, B phase, C phase, AB phase, BC phase, CA phase, AB phase, BC phase, CA phase, ABC phase.
When no distance protection has related definite value or has overcurrent overload apolegamy function, either oscillation fault is also non-vibration
Swing failure, by overcurrent phase selection andHalf cycle phase selection energy correct response failure is separate.
The Fault Phase Selection system based on current change quantity that the present invention also provides a kind of, is substantially computer software,
The system is process corresponding with the above method or program, since detailed description has been carried out in embodiment of the method, no
System embodiment is repeated again.
Specific embodiment is presented above, but the present invention is not limited to embodiment described above.The present invention
Basic ideas be above-mentioned basic scheme, for those of ordinary skill in the art, introduction according to the present invention is designed each
The model of kind deformation, formula, parameter do not need to spend creative work.The case where not departing from the principle and spirit of the invention
Under to embodiment carry out variation, modification, replacement and deformation still fall in protection scope of the present invention.
Claims (2)
1. a kind of fault phase-selecting method based on current change quantity, which comprises the steps of:
If non-oscillatory failure occurs for electric system, phase current is acquired, judges that the phase current is determined with overcurrent I sections of definite value, II sections of overcurrent
Relationship between value, III sections of definite values of overcurrent or overcurrent accelerating sections definite value, if the phase current is greater than overcurrent I sections of definite value, judgement should
Mutually break down at I sections of overcurrent；If the phase current is greater than overcurrent II sections of definite value, judge that this mutually breaks down at II sections of overcurrent；
If the phase current is greater than overcurrent III sections of definite value, judge that this mutually breaks down at III sections of overcurrent；If the phase current is greater than overcurrent
Accelerating sections definite value then judges that this mutually breaks down in overcurrent accelerating sections；The phase current includes monophase current, three-phase current and three
Phase current；
If oscillation fault occurs for electric system, acquisition zero-sequence current phase and negative-sequence current phase carry out failure constituency, further
It utilizesPhase selection is carried out, ifThe voltage range for meeting setting, then judge that this mutually breaks down,For single-phase phase angle
Or alternate phase angle, U are corresponding phase voltage or voltage between phases.
2. a kind of Fault Phase Selection system based on current change quantity, including memory, processor and storage are on a memory simultaneously
The computer program that can be run on a processor, which is characterized in that the processor realized when executing the computer program with
Lower step:
If non-oscillatory failure occurs for electric system, phase current is acquired, judges that the phase current is determined with overcurrent I sections of definite value, II sections of overcurrent
Relationship between value, III sections of definite values of overcurrent or overcurrent accelerating sections definite value, if the phase current is greater than overcurrent I sections of definite value, judgement should
Mutually break down at I sections of overcurrent；If the phase current is greater than overcurrent II sections of definite value, judge that this mutually breaks down at II sections of overcurrent；
If the phase current is greater than overcurrent III sections of definite value, judge that this mutually breaks down at III sections of overcurrent；If the phase current is greater than overcurrent
Accelerating sections definite value then judges that this mutually breaks down in overcurrent accelerating sections；The phase current includes monophase current, three-phase current and three
Phase current；
If oscillation fault occurs for electric system, acquisition zero-sequence current phase and negative-sequence current phase carry out failure constituency, further
It utilizesPhase selection is carried out, ifThe voltage range for meeting setting, then judge that this mutually breaks down,For single-phase phase angle
Or alternate phase angle, U are corresponding phase voltage or voltage between phases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811369415.0A CN109613392A (en) | 2018-11-16 | 2018-11-16 | A kind of fault phase-selecting method and system based on current change quantity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811369415.0A CN109613392A (en) | 2018-11-16 | 2018-11-16 | A kind of fault phase-selecting method and system based on current change quantity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109613392A true CN109613392A (en) | 2019-04-12 |
Family
ID=66004637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811369415.0A Pending CN109613392A (en) | 2018-11-16 | 2018-11-16 | A kind of fault phase-selecting method and system based on current change quantity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109613392A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662139A (en) * | 2009-08-31 | 2010-03-03 | 国电南京自动化股份有限公司 | Fault phase-selecting method in oscillation of high-voltage line protection |
| US20110149448A1 (en) * | 2008-08-29 | 2011-06-23 | Kabushiki Kaisha Toshiba | Short-circuit distance relay |
| CN102565599A (en) * | 2012-02-21 | 2012-07-11 | 昆明理工大学 | Method for judging internal and external faults of alternating current transmission line based on fractal dimension |
| CN104267313A (en) * | 2014-09-25 | 2015-01-07 | 广东易事特电源股份有限公司 | Micro grid system feeder line fault type distinguishing and fault point positioning method |
| CN104391221A (en) * | 2014-11-05 | 2015-03-04 | 昆明理工大学 | Fault phase selection method utilizing phase current gradient sums |
| CN104466928A (en) * | 2015-01-06 | 2015-03-25 | 华北电力大学 | Distance protection method and system |
-
2018
- 2018-11-16 CN CN201811369415.0A patent/CN109613392A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110149448A1 (en) * | 2008-08-29 | 2011-06-23 | Kabushiki Kaisha Toshiba | Short-circuit distance relay |
| CN101662139A (en) * | 2009-08-31 | 2010-03-03 | 国电南京自动化股份有限公司 | Fault phase-selecting method in oscillation of high-voltage line protection |
| CN102565599A (en) * | 2012-02-21 | 2012-07-11 | 昆明理工大学 | Method for judging internal and external faults of alternating current transmission line based on fractal dimension |
| CN104267313A (en) * | 2014-09-25 | 2015-01-07 | 广东易事特电源股份有限公司 | Micro grid system feeder line fault type distinguishing and fault point positioning method |
| CN104391221A (en) * | 2014-11-05 | 2015-03-04 | 昆明理工大学 | Fault phase selection method utilizing phase current gradient sums |
| CN104466928A (en) * | 2015-01-06 | 2015-03-25 | 华北电力大学 | Distance protection method and system |
Non-Patent Citations (2)
| Title |
|---|
| 杨晓敏: "《电力系统继电保护原理及应用》", 31 August 2006 * |
| 许庆强，等: "基于相间故障弧光电压特征的高压线路选相元件", 《电力系统自动化》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Fang et al. | Impact of inverter-interfaced renewable energy generators on distance protection and an improved scheme | |
| Haddadi et al. | Impact of wind generation on power swing protection | |
| CN108054764A (en) | A kind of multifunctional ligand power grid flexible ground device and control method | |
| CN101701998A (en) | Novel faulty line selection method in low current faulty grounding system | |
| Yang et al. | Fault coordination control for converter-interfaced sources compatible with distance protection during asymmetrical faults | |
| CN105917539A (en) | Method and apparatus of reactor turn-to-turn protection | |
| CN106684834B (en) | A kind of power distribution network adaptive Current Protection system and method | |
| CN104578013B (en) | A kind of direction protection method of the power distribution network containing DFIG based on power frequency difference | |
| CN104391221A (en) | Fault phase selection method utilizing phase current gradient sums | |
| CN106959403B (en) | A kind of distributed generation resource access distribution net work earthing fault detection method | |
| Chao et al. | Adaptive distance protection based on the analytical model of additional impedance for inverter-interfaced renewable power plants during asymmetrical faults | |
| CN106981861A (en) | A kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method | |
| CN102818973A (en) | Phase sequence voltage amplitude comparison-based failure phase selection method and device | |
| CN103337840A (en) | Control method of large AC-DC interconnected power grid short-circuit current limiter electromechanical transient model | |
| CN109950862A (en) | A kind of self-adaptive current fixed value adjusting method | |
| CN103050933A (en) | Large-scale battery storage power station interface protection method based on single-ended break variable of current | |
| CN207705796U (en) | A kind of multifunctional ligand power grid flexible ground device | |
| Taalab et al. | Performance of power differential relay with adaptive setting for line protection | |
| CN102590698B (en) | Small current grounding line selection device and control method of voltage disturbance locked line selection | |
| CN109613392A (en) | A kind of fault phase-selecting method and system based on current change quantity | |
| CN108964145B (en) | Testing method and system for low-frequency load shedding and frequency crossing generator tripping device | |
| Sharma et al. | Sequence Impedance Angles based Fault Discrimination Technique in Grid Connected Solar PV System | |
| CN103944151A (en) | Ungrounded system multi-circuit parallel line different-phase two-point grounding protection method | |
| CN104333043B (en) | Method for evaluating influence, on three-section-type current protection of distribution network, of distributed-type power source connection | |
| CA3086377A1 (en) | System and method for use with microgrids having inverter-based distributed generators |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190412 |