CN106468752B - The solid circuit breaker RCD buffer circuit and Fault Locating Method of integrated fault location - Google Patents
The solid circuit breaker RCD buffer circuit and Fault Locating Method of integrated fault location Download PDFInfo
- Publication number
- CN106468752B CN106468752B CN201610859448.8A CN201610859448A CN106468752B CN 106468752 B CN106468752 B CN 106468752B CN 201610859448 A CN201610859448 A CN 201610859448A CN 106468752 B CN106468752 B CN 106468752B
- Authority
- CN
- China
- Prior art keywords
- fault
- circuit
- solid
- circuit breaker
- diode
- 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.)
- Active
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
- G01R31/088—Aspects of digital computing
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
Abstract
A kind of solid circuit breaker RCD buffer circuit and trouble point checking method for being integrated with fault location function of the present invention.Including RCD buffer circuit, wherein the one end capacitor Cs is connected with V1 collector, and the other end is separately connected the anode of resistance Rs Yu diode Ds, and the other end of resistance Rs connects signal ground.The one end relay Ts is connected with the cathode of diode Ds, and the other end connects the collector of V2, shares same control signal with disconnecting switch T, for controlling the conducting when playing buffer function of diode Ds branch, turns off during fault location.The present invention can be while effective inhibition shutdown overvoltage; by the movement for controlling disconnecting switch, relay and solid circuit breaker; realize the accurate positionin to fault point; for rapidly removing faults in direct-current micro-grid; the reliability and security of guarantee system improves the utilization rate of device, reduces the volume and cost of protective device; and topological structure is simple, has the feasibility of application.
Description
Technical field
The invention belongs to direct-current grid technical fields, are related to the protection and detection of direct-current micro-grid bus-bar fault, especially
A kind of solid circuit breaker RCD buffer circuit and trouble point checking method being integrated with fault location function.
Background technique
When permanent fault occurs for DC grid, due to breaker cannot reclosing again, it is reliable in order to improve power supply
Property and stability of power system, position of failure point should be quickly found out, debug.The failure of existing direct-current micro-grid transmission line
Distance measuring method mainly has impedance method and two kinds of traveling wave method.
Impedance method has starting definite value quantization, small investment etc. usually as Microcomputer Protection and the additional function of wave recording device
Feature；But in direct-current micro-grid, since such as IGBT of the Sensitive Apparatus in direct current system etc. needs quickly when fault current is very big
Shutdown is to be protected, and actuation time, and impedance method was the measurement based on steady-state value, therefore cannot be expired generally within a few milliseconds
The temporal requirement of foot；Impedance method range accuracy is influenced by factors such as transition resistance, distribution capacity, system operation modes simultaneously
It is larger, requirement of the electric system to range accuracy is not able to satisfy in precision.
Fault Location With Traveling Wave includes single-ended method travelling wave ranging and both-end method travelling wave ranging.Single-ended method travelling wave ranging does not need to transmit
It is limited to side data, not by communication technology condition, has the characteristics that investment is small, implementation is simple, range accuracy is high, but single-ended method row
Wave ranging needs to consider the factors such as the decaying of traveling wave and the reflection of bus, there is situations such as identification radioactive wave is difficult；Both-end method is surveyed
Away from traveling wave Mintrop wave head is only identified, do not have to distinguish back wave, range accuracy is high, but both-end method ranging requires two sides device to access system
One, stable signal source of clock and the route for requiring two sides to communicate there is very high reliability, otherwise easily cause survey
The case where away from failure.In addition, either single-ended method travelling wave ranging or both-end method travelling wave ranging, require electrical outside plus
Equipment increases investment, and starting threshold setting is often lower in its starting not energetic actual motion of definite value, is easy accidentally to open
It is dynamic.
Therefore both the above side's telemetry has certain limitation under certain condition,
In addition, when direct-current micro-grid breaks down, due to unlike, there are electric current natural zero-crossing point, both ends are solid in AC system
Current-rising-rate di/dt of the state electronic switch (SSCB) in opening process and the off state voltage climbing in turn off process
Du/dt is very big, may power device be damaged or be punctured.In addition, even if solid electronic switch is completed shutdown and is moved
Make, the energy on route stored by inductance will generate excessive voltage at device both ends, if not adopting an effective measure, direct current is solid
State electronic switch will be the hard shutdown under high current, high voltage when acting, this will be such that it even damages by enormous impact.Cause
This needs to increase certain buffer circuit to be avoided SSCB from being destroyed, such as RCD buffer circuit.
Summary of the invention
The purpose of the present invention is designing a kind of buffer circuit with fault location function, the two function is integrated,
It can effectively improve the utilization rate of device, reduce the volume of protection circuit, save the cost of direct-current grid fault protection system.
The technical solution of solid circuit breaker buffer circuit with fault location function of the invention is:
A kind of solid circuit breaker RCD buffer circuit being integrated with fault location function is applied in direct-current grid, special
Sign is, including solid circuit breaker and RCD buffer circuit, wherein
The solid circuit breaker includes two anti-series IGBT groups, and each IGBT group is made of IGBT anti-paralleled diode,
The both ends of solid circuit breaker are respectively the end V1 and the end V2, wherein connect disconnecting switch T on the bus of the port V1, for ensuring event
Barrier part of path is isolated with micro-grid system remainder；
The buffer circuit includes capacitor Cs, and the one end capacitor Cs is connected with V1 collector, and the other end is separately connected buffering
The other end of the anode of resistance Rs and diode Ds, buffer resistance Rs connects signal ground；The yin of the one end relay Ts and diode Ds
Extremely it is connected, the other end connects the collector of V2, same control signal is shared with disconnecting switch T, for controlling diode Ds branch
It is connected when playing buffer function, is turned off during fault location.
A kind of Fault Locating Method based on solid circuit breaker RCD buffer circuit characterized by comprising
Step 1, control disconnecting switch T and relay Ts is simultaneously switched off, and avoids two poles while carrying out faulty section isolation
Influence of the pipe Ds to position fixing process；
Step 2, control solid circuit breaker is again open-minded, makes to form oscillating current in circuit, passes through detection line current i's
Peak value and damped oscillation frequency calculate fault point distance.
Fault point in a kind of direct-current micro-grid based on the solid circuit breaker RCD buffer circuit for being integrated with fault location function
Detection and calculation method, which is characterized in that line current i meets second-order circuit zero input response changing rule, attenuation coefficient,
The parameters such as damped oscillation frequency and short dot distance have functional relation, by carrying out sample detecting to line current i, calculate failure
The distance method of point is as follows:
The present invention is characterized in that devising a kind of buffer circuit topology of solid circuit breaker, it is made to have both fault location function
Energy.When short trouble occurs for route, either pole fault to ground or intereelectrode short-circuit failure, the solid-state open circuit on faulty line
Device makes an immediate response current comparison pilot protection and controlled switch-off.Short circuit current is transferred on RCD buffer circuit by solid circuit breaker,
By buffering capacitor Cs and two branch afterflows of buffer resistance Rs to inhibit di/dt, solid circuit breaker both ends are avoided to be formed larger
Shutdown overvoltage device is damaged.The circuit realizes that fault location function is divided into two steps: the first step is solid circuit breaker
Unsuccessful reclosing, after judging fault type for permanent fault, control disconnecting switch T and relay Ts is simultaneously switched off, and is being carried out
Faulty section avoids influence of the diode Ds to position fixing process while isolation；Second step is that control solid circuit breaker is again open-minded,
At this time by buffering capacitor Cs, buffer resistance Rs, breaker parasitic inductance Ls, line resistance λ R, inductance λ L and fault resstance RfStructure
At LC oscillating circuit, fault location function may be implemented by detecting line current, below fault point detection and calculation method
It is illustrated.
Fault point in a kind of direct-current micro-grid based on the solid circuit breaker RCD buffer circuit for being integrated with fault location function
Detection and calculation method, which is characterized in that line current i meets second-order circuit zero input response changing rule, attenuation coefficient,
The parameters such as damped oscillation frequency and short dot distance have functional relation, by carrying out sample detecting to line current i, calculate failure
The distance method of point is as follows:
In LC oscillating circuit, capacitor Cs has initial voltage, and line current i meets second-order circuit zero input response variation
Rule indicates are as follows:
Wherein, αdFor attenuation coefficient, ωdFor damped resonance frequency；Line current i is detected when sample frequency is met the requirements,
N is number of sampling points, AiFor sampled current value, tiFor sampling instant, αd、ωdCalculation method is as follows:
The natural frequency ω of they and circuitoMeet relationship:
Fault distance λ and fault resstance RfCalculating process is as follows:
By above-mentioned detection and calculation method, can be realized as when known to the inductive technologies parameter in route unit length pair
The positioning of fault point.
Determine the present invention has the advantage that 1. topologys of the invention make the buffer circuit of solid circuit breaker have both fault point
Both bit function, with RCD buffer circuit is respectively set within a protection system compared with the mode of LC fault location circuit, avoid
Between reciprocation have a negative impact to its function, thus cause over-voltage suppression effect be deteriorated or positioning accuracy reduce feelings
Condition.Device parameters each in topology of the invention are designed and are selected to meet wanting for over-voltage suppression effect and positioning accuracy simultaneously
It asks.2. topological feature of the invention is that function is integrated.Since fault location only carries out after permanent fault occurs, and microgrid
Fault type is mostly transient fault in system, therefore fault location circuit frequency of use is not high.In such a way that function is integrated
The utilization rate that device can be greatly improved reduces the volume of protective device, reducings the construction costs.3. buffering electricity with traditional RCD
Road compares, and topology of the invention only increases the relay of one with Diode series, and topological structure is simple, and cost is relatively low
And it is easy to implement.
Detailed description of the invention
Fig. 1 is the direct current micro-grid system structure chart of the embodiment of the present invention.
Fig. 2 is short circuit current figure of the embodiment of the present invention when intereelectrode short-circuit failure occurs before solid circuit breaker shutdown.
Fig. 3 is short circuit current figure of the embodiment of the present invention when intereelectrode short-circuit failure occurs after solid circuit breaker shutdown.
Fig. 4 is line electricity flow graph of embodiment of the present invention during fault location.
Specific embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, with reference to the accompanying drawings and embodiments to this hair
It is bright to be described in further detail, it should be understood that implementation example described herein is merely to illustrate and explain the present invention, not
For limiting the present invention.
Referring to Fig.1, the technical solution of the solid circuit breaker buffer circuit with fault location function of the invention is: by two
A IGBT (V1, V2) anti-series with anti-paralleled diode constitute solid circuit breaker, disconnecting switch of connecting on the bus of the port V1
T, for ensuring that fault wire section is isolated with micro-grid system remainder.The one end capacitor Cs and V1 collector in RCD buffer circuit
It is connected, the other end is separately connected the anode of resistance Rs Yu diode Ds, and the other end of resistance Rs connects signal ground.The one end relay Ts
It is connected with the cathode of diode Ds, the other end connects the collector of V2, same control signal is shared with disconnecting switch T, for controlling
Diode Ds branch processed conducting when playing buffer function, turns off during fault location.
The transmission line of electricity of the direct-current grid of the present embodiment is bipolarity transmission line of electricity, and line equivalent model uses π pattern
Block carrys out simulation distribution parameter with segmented lumped parameter resistance λ R, inductance λ L, capacitor λ C.Simulated failure point is set in route, with
It is illustrated for intereelectrode short-circuit failure.
Buffer circuit is not open-minded when normal work, and no electric current passes through, and has 0.5u on capacitor CsdcInitial voltage.Under
The case where face flows to bus two from bus one using energy realizes over-voltage as embodiment, to the buffer circuit after short trouble occurs
Inhibit and the process of fault location effect carries out detailed analysis.
Fig. 2 is short circuit current figure when intereelectrode short-circuit failure occurs before solid circuit breaker shutdown.Short circuit current respectively from
Bus bar side pours into short circuit trouble point.After detecting short circuit current, solid breaker is opened under the action of current comparison pilot protection
Begin to turn off.In turn off process, when the voltage on solid electronic switch reaches 0.5udcWhen RCD buffer circuit start to act on, short circuit
By solid circuit breaker, gradually the change of current flows to short dot by Ds, when short to buffering capacitor Cs and buffer resistance Rs branch road to electric current
After road electric current is transferred completely on buffer circuit, solid circuit breaker is complete switched off.
Fig. 3 is the short circuit current figure after solid circuit breaker shutdown.Due to the effect of Cs and Rs branch in buffer circuit, keep away
It is excessive to form very big shutdown overvoltage at solid circuit breaker both ends di/dt in route stray inductance is exempted from, it is ensured that solid-state
The safe shutdown of electronic switching device.
In order to judge fault type and debug as early as possible, need to take reclosing operation to solid circuit breaker.If weight
Closing success illustrates that failure is instantaneity, and system will be restored to operate normally；If still detecting biggish short circuit electricity after reclosing
Stream, will be deemed as permanent fault, should disconnect solid circuit breaker immediately, and be positioned to quickly exclude event to fault point
Barrier.
Fault location operation is divided into two steps, and the first step is that control disconnecting switch T and relay Ts is simultaneously switched off, and is carrying out event
Influence of the diode Ds to position fixing process is avoided while barrier section isolation；Second step is that control solid circuit breaker is again open-minded, by
In there are initial voltages on buffering capacitor Cs, in buffering capacitor Cs, buffer resistance Rs, breaker parasitic inductance Ls, line resistance λ
R, inductance λ L and fault resstance RfOscillating current is formed in the circuit of composition, Fig. 4 is the line electricity flow graph during fault location.
Current value is sampled at fault current detection point in Fig. 4, according to the meter of fault point in technical solution of the present invention
Calculation method can acquire fault point to the accurate distance of test point, realize fault location.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (2)
1. a kind of solid circuit breaker RCD buffer circuit for being integrated with fault location function is applied in direct-current grid, feature
It is, including solid circuit breaker and RCD buffer circuit, wherein
The solid circuit breaker includes two anti-series IGBT groups, and each IGBT group is made of IGBT anti-paralleled diode, solid-state
The both ends of breaker are respectively the end V1 and the end V2, wherein connect disconnecting switch T on the bus of the port V1, for ensuring fault wire
Section is isolated with micro-grid system remainder；
The buffer circuit includes capacitor Cs, and the one end capacitor Cs is connected with V1 collector, and the other end is separately connected buffer resistance
The other end of the anode of Rs and diode Ds, buffer resistance Rs connects signal ground；The cathode phase of the one end relay Ts and diode Ds
Even, the other end connects the collector of V2, shares same control signal with disconnecting switch T, is sending out for controlling diode Ds branch
Conducting when waving buffer function turns off during fault location.
2. the direct-current micro-grid based on the solid circuit breaker RCD buffer circuit described in claim 1 for being integrated with fault location function
The detection and calculation method of middle fault point, which is characterized in that line current i meets second-order circuit zero input response changing rule,
The parameters such as its attenuation coefficient, damped oscillation frequency and short dot distance have functional relation, by carrying out sampling inspection to line current i
It surveys, the distance method for calculating fault point is as follows:
In LC oscillating circuit, capacitor Cs has initial voltage, and line current i meets second-order circuit zero input response variation rule
Rule indicates are as follows:
Wherein, αdFor attenuation coefficient, ωdFor damped resonance frequency；Line current i is detected when sample frequency is met the requirements, N is
Number of sampling points, AiFor sampled current value, tiFor sampling instant, αd、ωdCalculation method is as follows:
The natural frequency ω of they and circuitoMeet relationship:
Fault distance λ and fault resstance RfCalculating process is as follows:
Wherein,
Ls is breaker parasitic inductance, λ R is line resistance, λ L is inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610859448.8A CN106468752B (en) | 2016-09-27 | 2016-09-27 | The solid circuit breaker RCD buffer circuit and Fault Locating Method of integrated fault location |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610859448.8A CN106468752B (en) | 2016-09-27 | 2016-09-27 | The solid circuit breaker RCD buffer circuit and Fault Locating Method of integrated fault location |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106468752A CN106468752A (en) | 2017-03-01 |
| CN106468752B true CN106468752B (en) | 2019-08-20 |
Family
ID=58230726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610859448.8A Active CN106468752B (en) | 2016-09-27 | 2016-09-27 | The solid circuit breaker RCD buffer circuit and Fault Locating Method of integrated fault location |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106468752B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11022651B2 (en) * | 2017-03-02 | 2021-06-01 | Vacon Oy | Arrangement and method for a safe turn off |
| CN107543998B (en) * | 2017-07-18 | 2020-06-30 | 华北电力大学 | Direct-current side fault positioning system and method for multi-terminal flexible direct-current power transmission system |
| DE102017212730A1 (en) * | 2017-07-25 | 2019-01-31 | Siemens Aktiengesellschaft | Method and device for fault location along a power supply line in DC systems |
| CN109444669A (en) * | 2018-12-20 | 2019-03-08 | 上海交通大学 | For carrying out the method and device of fault localization to direct current distribution route |
| CN114667656B (en) * | 2019-12-31 | 2024-03-08 | 西门子股份公司 | Hybrid circuit breaker, hybrid circuit breaking system and circuit breaking method |
| CN114236267B (en) * | 2021-11-23 | 2024-01-30 | 西安西电电力系统有限公司 | Device for applying fault current based on high-capacity power electronic switch and test method |
| CN114252752B (en) * | 2021-12-22 | 2022-12-16 | 清华大学 | Fault diagnosis method for power tube in full-control bridge topology circuit |
| CN115528659B (en) * | 2022-11-23 | 2023-03-10 | 武汉大学 | Direct current breaker with automatic and controllable turn-off capability and use method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06331679A (en) * | 1993-05-18 | 1994-12-02 | Nippon Signal Co Ltd:The | Switching circuit fault detecting device |
| WO2007064837A2 (en) * | 2005-11-30 | 2007-06-07 | Electric Power Research Institute, Inc. | A multifunction hybrid solid-state switchgear |
| CN103928912A (en) * | 2014-05-08 | 2014-07-16 | 武汉大学 | Short-circuit protection circuit and method of solid state electronic switch of direct current micro-grid |
| CN103986138A (en) * | 2014-05-14 | 2014-08-13 | 国家电网公司 | Modularized current-limiting breaker power module |
| CN104242265A (en) * | 2014-08-29 | 2014-12-24 | 荣信电力电子股份有限公司 | Full-solid-state direct-current circuit breaker of direct-current power distribution network |
| CN104579279A (en) * | 2015-01-20 | 2015-04-29 | 华北电力大学（保定） | Optical fiber trigger type high-voltage solid-state switch |
| CN105301397A (en) * | 2015-11-03 | 2016-02-03 | 中国南方电网有限责任公司超高压输电公司南宁局 | Simulation breaker with fault simulation function and simulation method |
-
2016
- 2016-09-27 CN CN201610859448.8A patent/CN106468752B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06331679A (en) * | 1993-05-18 | 1994-12-02 | Nippon Signal Co Ltd:The | Switching circuit fault detecting device |
| WO2007064837A2 (en) * | 2005-11-30 | 2007-06-07 | Electric Power Research Institute, Inc. | A multifunction hybrid solid-state switchgear |
| CN103928912A (en) * | 2014-05-08 | 2014-07-16 | 武汉大学 | Short-circuit protection circuit and method of solid state electronic switch of direct current micro-grid |
| CN103986138A (en) * | 2014-05-14 | 2014-08-13 | 国家电网公司 | Modularized current-limiting breaker power module |
| CN104242265A (en) * | 2014-08-29 | 2014-12-24 | 荣信电力电子股份有限公司 | Full-solid-state direct-current circuit breaker of direct-current power distribution network |
| CN104579279A (en) * | 2015-01-20 | 2015-04-29 | 华北电力大学（保定） | Optical fiber trigger type high-voltage solid-state switch |
| CN105301397A (en) * | 2015-11-03 | 2016-02-03 | 中国南方电网有限责任公司超高压输电公司南宁局 | Simulation breaker with fault simulation function and simulation method |
Non-Patent Citations (1)
| Title |
|---|
| Suppression Strategy for Short-circuit Current in Loop-type DC Microgrid;Xiaoming Zha 等;《2014 IEEE Energy Conversion Congress and Exposition (ECCE)》;20141231;第758-764页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106468752A (en) | 2017-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106468752B (en) | The solid circuit breaker RCD buffer circuit and Fault Locating Method of integrated fault location | |
| CN106707081B (en) | flexible direct current power distribution network monopole grounding fault identification and fault protection method | |
| Li et al. | A novel traveling-wave-based directional protection scheme for MTDC grid with inductive DC terminal | |
| CN103840437B (en) | The quick diagnosis of power distribution network ferromagnetic resonance and singlephase earth fault and processing method | |
| CN107102236B (en) | A kind of fault line selection method for single-phase-to-ground fault based on waveform correlation analysis after failure | |
| Zhang et al. | Non-unit traveling wave protection of HVDC grids using Levenberg–Marquart optimal approximation | |
| Lin et al. | An adaptive reclosure scheme for parallel transmission lines with shunt reactors | |
| CN102621451B (en) | Based on the distribution circuit single-phase earth fault detection method of momentary signal method | |
| Lin et al. | A selective single-phase-to-ground fault protection for neutral un-effectively grounded systems | |
| WO2009081215A2 (en) | Equipment and procedure to determine fault location and fault resistance during phase to ground faults on a live network | |
| CN102353873A (en) | Line selection method realized by using single criterion for low-current ground system during single-phase ground fault | |
| CN110346688A (en) | A kind of high pressure complexity cable fault quick segmentation differentiates and localization method | |
| CN105356441A (en) | Intelligent PT harmonic elimination and phase selection method and device | |
| CN205544206U (en) | Intelligence PT harmonic elimination selects device of looks | |
| Jiang et al. | A fault location method for DC lines connected with DAB terminal in power electronic transformer | |
| CN107561408B (en) | Method for improving accuracy rate of small current ground fault line selection | |
| Suonan et al. | A novel single-phase adaptive reclosure scheme for transmission lines with shunt reactors | |
| Wang et al. | Improved voltage‐based protection scheme for an LVDC distribution network interfaced by a solid state smart transformer | |
| CN103368166B (en) | A kind of zero sequence total current power direction realizes the method for coalmine high-voltage power network selective earth leakage protection | |
| Patil et al. | Real time protection technique for DC microgrid using local measurements | |
| Nayak et al. | Detecting fault during power swing for a series compensated line | |
| Li et al. | Efforts on improving the performance of superimposed-based distance protection | |
| CN102879710B (en) | System and method for detecting single-phase ground fault point of power distribution line | |
| Kumar et al. | Synchrophasor‐based system integrity protection scheme for an ultra‐mega‐power project in India | |
| Li et al. | Transient fault identification method for bipolar short‐circuit fault on MMC‐HVDC overhead lines based on hybrid HVDC breaker |
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 |