CN207705795U - A kind of novel mixed topology multifunctional electric power network distribution device - Google Patents
A kind of novel mixed topology multifunctional electric power network distribution device Download PDFInfo
- Publication number
- CN207705795U CN207705795U CN201820038580.7U CN201820038580U CN207705795U CN 207705795 U CN207705795 U CN 207705795U CN 201820038580 U CN201820038580 U CN 201820038580U CN 207705795 U CN207705795 U CN 207705795U
- Authority
- CN
- China
- Prior art keywords
- phase
- distribution network
- line
- ground
- power
- 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.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Locating Faults (AREA)
Abstract
The utility model discloses a kind of novel mixed topology multifunctional electric power network distribution devices, the device is set to generator side, power distribution network Circuit Fault on Secondary Transformer or power distribution network bus bar side, the device includes 3-phase power converter, adjustable inductance and controllable switch, and the neutral point of 3-phase power converter can pass through adjustable inductance and controllable switch series connection ground connection.When distribution normal operation, device is operated in reactive-load compensation pattern, and time closing controllable switch measures line-to-ground parameter, changes the induction reactance value of adjustable inductance according to line-to-ground parameter value.Utility model device has the function of reactive-load compensation, line-to-ground parameter measurement, circuit single-phase earthing extinguishing arc, the point route selection of circuit single-phase earthing and positioning, the Integration Design of multiple functions is realized, and can be with the normal operation of the no-power compensation function of holding meanss while realizing the functions such as line-to-ground parameter measurement, single-phase earthing extinguishing arc, single-phase earthing point route selection and positioning.
Description
Technical field
The reactive-load compensation of the utility model category power industry more particularly to three-phase isolated neutral system power distribution network, line
Road fields such as Parameter Measuring, singlephase earth fault extinguishing arc and single-phase earthing point location over the ground, it is specially a kind of novel mixed
Close topological multifunctional electric power network distribution device.
Background technology
Domestic medium voltage distribution network mostly uses greatly the method for operation of isolated neutral, due to the development in city, city power distribution
Net constantly expands, and power cable usage amount is continuously increased, and distribution line direct-to-ground capacitance increasingly increases, when power distribution network generation is single-phase
When earth fault, easily cause seriously to earth-current.Distribution network line capacitive earth current is to influence distribution network planning design and fortune
The important parameter of row safety.The size of capacitance current not only has decided on whether the benefit for needing to install arc suppression coil and arc suppression coil
Capacity is repaid, and power distribution network needs to carry out switching to different circuits in the process of running, therefore line-to-ground parameter is real-time
On-line measurement is particularly important.The measurement of capacitor current for earthing is broadly divided into method of engineering calculation, direct method and indirect method.
Method of engineering calculation carries out theoretical calculation according to parameters such as the length of circuit to direct-to-ground capacitance, is generally used for assessment new construction, meter
It is larger to calculate error, is only used for referring to.Direct method also becomes metallic ground method, and the method directly operates a circuit,
It is easy to bring safety issue to survey crew.General line-to-ground parameter measurement uses indirect method, and the letter in indirect method
Number injection method is widely used due to its safe operation.But signal injection method be by PT or arc suppression coil to
Power distribution network injects measuring signal, on the one hand can be influenced by transformer leakage impedance, on the other hand pass through the transformer of high no-load voltage ratio
The Injection Signal in power distribution network can be caused to decay excessive, it is difficult to accurate to measure.
When singlephase earth fault occurs for medium voltage distribution network, since earth point fault current is larger, electric arc is difficult to voluntarily put out
It goes out, if timely and effective inhibition cannot be obtained, easily develops into permanent singlephase earth fault, thereby increases and it is possible to cause more than 3 times phase voltages
System overvoltage, lead to sound mutually insulation weak link breakdown, cause phase fault.So the event of power distribution network single-phase earthing point
It is accurate and quick to hinder current compensation needs, the further development of arc light could be inhibited in time in this way.Present the single-phase of power distribution network connects
The method of extinguishing arc is broadly divided into two kinds of voltage extinguishing arc and electric current extinguishing arc in earth fault.Voltage extinguishing arc method is exactly by controlling failure phase
Restore voltage, it is zero or too late dielectric breakdown voltage so that failure is mutually restored voltage, to realize arc extinguishing.Traditional " arc extinction cabinet "
Applied voltage extinguishing arc principle, using circuit breaker short circuit earth fault phase, the method for clamping down on faulted phase voltage prevents fault electric arc weight
Combustion.But it is restricted by high resistance earthing fault phase selection precision is low, in fact it could happen that mistake phase selection, short circuit non-faulting phase problem, while by
It is limited to breaker acting speed, switching the electric arc of several ms before short circuit cannot effectively control, and short circuit bypass dash current is big, can
The current potential of substation can be interfered.Electric current extinguishing arc method reduces dielectric damages and mutually restores electricity with failure using residue current of ground fault in electrical is inhibited
The method of the rate of climb of pressure promotes failure extinguishing arc.Arc suppression coil promotes electric arc because it is with effective compensation fault capacitance electric current
The advantages of quickly extinguishing, is used widely in power distribution network.But the active loss of arc suppression coil increases earth fault electricity
The active component of stream, and its adjustment is difficult, cumbersome, tuning-off degree measures difficulty, and tuning is improper to be also easy to produce resonance overvoltage.
The frequency that singlephase earth fault occurs in medium voltage distribution network is high, when singlephase earth fault occurs, will not be formed
Short-circuit loop is only caused the earth-fault current of very little, system that can continue to run with by the distribution capacity of system.But single-phase event
When barrier ground connection, non-faulting phase-to-ground voltage increases, and overvoltage may cause earth fault to be converted into phase fault, serious to endanger
Evil system insulation and equipment safety.For system safety operation, power supply reliability, reduction loss of outage are improved, is needed single-phase
Faulty line and position of failure point are determined after earth fault rapidly, further to take troubleshooting measure.To single-phase earthing
The localization method of the fault point of failure is broadly divided into two classes, active localization method and passive type localization method.Active failure
Localization method is to inject signal specific to system after line failure, by detecting the distribution of institute's Injection Signal in systems
Determine position of failure point.Passive type Fault Locating Method is then the feature of voltage and current signal produced by utilizing failure itself,
Design Orientation algorithm, determines position of failure point.Active Fault Locating Method is broadly divided into zero-sequence current mutation method, middle resistance again
Method, transfer function method, signal injection method.Zero-sequence current mutation method is to generate zero-sequence current mutation by changing arc suppression coil parameter
Amount realizes positioning, is influenced by jitterbug, and changes arc suppression coil parameter and be unfavorable for system safety.Middle electric-resistivity method is in event
Barrier artificially puts into a medium resistance between property point and ground in systems after occurring, and detects additional power frequency fault current distribution, should
Method artificially increases earth current, increases system security risk, and medium resistance difficult design.Transfer function method be
Failure exit applies a kind of method of single end distance measurement of the square wave diagnostic signal according to the frequency spectrum of transmission function, due to distribution network parameters
Complexity, this method are only feasible in theory, it is difficult to practical application.Generally signal injects in active Fault Locating Method
Method is widely applied since it avoids the vulnerability to jamming of faults itself signal.Signal injection method generally utilizes signal
Injection device injects specific current signal by busbar PT to system, and there is limited by PT capacity for common AC signal injection
System and the current signal in system fainter the problems such as being difficult to detect, is transmitted to by PT.
Above-mentioned line-to-ground parameter measurement, single-phase earthing extinguishing arc, the method for uniline ground connection point location not only have in itself
The shortcomings that being difficult to overcome, and each function is required for specific protective device, causes distribution network system protective device complicated,
The problems such as management is inconvenient, and protection is low with detection device utilization rate.Flexible ground device based on power electronic devices is generally installed
At power network neutral point, only just work when singlephase earth fault occurs for distribution network line, without other additional functions, equipment
Utilization rate is relatively low.
Utility model content
In consideration of it, the purpose of this utility model is to provide a kind of novel mixed topology multifunctional electric power network distribution device.
The device realizes reactive-load compensation and line-to-ground parameter measurement in day-to-day operation；Extinguishing arc, list are realized in singlephase earth fault
Reactive-load compensation normal operation is kept while the route selection of phase earth point and positioning function.
The purpose of this utility model is achieved through the following technical solutions, a kind of novel mixed topology multifunction power electricity
Sub- network distribution device, the device are set to generator side, power distribution network Circuit Fault on Secondary Transformer or power distribution network bus bar side, which includes three
Phase current transformer, adjustable inductance and controllable switch；
The 3-phase power converter access generator side, power distribution network Circuit Fault on Secondary Transformer or power distribution network bus bar side, the three-phase
The neutral point of current transformer can pass through adjustable inductance and controllable switch series connection ground connection；
Described device is operated in reactive-load compensation pattern under normal circumstances, and time closing controllable switch measures line-to-ground
Parameter changes the induction reactance value of adjustable inductance according to line-to-ground parameter value；It is described when singlephase earth fault occurs for power distribution network
Controllable switch is closed, which injects zero sequence/common mode current or zero sequence/common-mode voltage into power distribution network three-phase line and combination can
Mode inductance inhibits the generation of single-phase earthing arc light phenomenon in time；
When the permanent singlephase earth fault of generation, which injects characteristic current into power distribution network, and line of engagement road is pacified
The specific section of the fault signature current detector judgement line-to-ground point of dress；And reactive-load compensation, the single-phase earthing of the device
Failure extinguishing arc and fault location function can be carried out at the same time.
Further, the 3-phase power converter be two level three-phase half-bridges, three-level three-phase half-bridge, more level three-phase half-bridges or
Three-phase tandem type H bridges.
Further, the 3-phase power converter is the 3-phase power converter of high pressure level, directly hangs over 10kV or 35kV voltages etc.
On the power distribution network busbar of grade.
Further, the 3-phase power converter is the 3-phase power converter of low pressure grade, and the 3-phase power converter is become by boosting
Depressor is connected on the power distribution network busbar of 10kV or 35kV voltage class.
By adopting the above-described technical solution, the utility model has the following advantages：
General power distribution network usually requires to be equipped with reactive-load compensation, line-to-ground parameter measurement, singlephase earth fault extinguishing arc, single-phase
A series of devices of line-to-ground point location, cause distribution network system protective device complicated, and management is inconvenient, protection and detection device profit
The problems such as low with rate, for this problem, the utility model proposes one kind having reactive-load compensation, over the ground parameter measurement, single-phase earthing
The novel distribution network device of the function integrations such as failure extinguishing arc, uniline ground connection point location, the machine multiplexing of real realization device,
And each additional function and the mutual Lothrus apterus of no-power compensation function.
Description of the drawings
In order to keep the purpose of this utility model, technical solution and advantage clearer, below in conjunction with attached drawing to this practicality
It is novel to be described in further detail, wherein：
Fig. 1 is distribution network topology and utility model apparatus structure schematic diagram；
Fig. 2 is using cascaded H-bridges as the utility model apparatus structure schematic diagram of embodiment；
Fig. 3 is using two-level inverter and step-up transformer as the multi-function device structural schematic diagram of embodiment；
Fig. 4 is to survey line mutual-ground capacitor equivalent circuit；
Fig. 5 is the fault signature current detector arrangement schematic diagram positioned for one-phase earthing failure in electric distribution network.
Specific implementation mode
Below with reference to attached drawing, the preferred embodiment of the utility model is described in detail；It should be appreciated that preferably real
Example is applied only for illustrating the utility model, rather than in order to limit the scope of protection of the utility model.
Fig. 1 is distribution network topology and utility model apparatus structure schematic diagram；Fig. 2 is using cascaded H-bridges as the reality of embodiment
With New device structures schematic diagram；Fig. 3 is using two-level inverter and step-up transformer as the multi-function device structure of embodiment
Schematic diagram；Fig. 4 is to survey line mutual-ground capacitor equivalent circuit；Fig. 5 is the fault signature positioned for one-phase earthing failure in electric distribution network
Current detector arrangement schematic diagram.
Fig. 1 is typical distribution network line figure, including line mutual-ground capacitor and voltage transformer, the 3-phase power converter in figure
12 topology can be that cascaded H-bridges or the boosted transformer of two-level inverter as shown in Figure 3 as shown in Figure 2 are grid-connected etc.
Structure.The neutral point of utility model device can be grounded by adjustable inductance 13 and the series connection of controllable switch 14.
In the present embodiment, controllable switch 14 is contactor S1.
The utility model has reactive-load compensation, over the ground parameter measurement, circuit single-line ground extinguishing arc, circuit single-line ground route selection
The functions such as positioning can realize the functions such as line-to-ground parameter measurement, single-phase earthing extinguishing arc, single-phase earthing point route selection and positioning
While realization device no-power compensation function, be truly realized a machine multiplexing, each additional function and no-power compensation function are mutual
Lothrus apterus.
The operation principle of each function addressed below：
Reactive-load compensation pattern：When utility model device operates in reactive-load compensation pattern, contactor S1 is disconnected, the control of device
Method processed is based on the dq Uncoupling Control Baseds under synchronous rotating frame.
Line mutual-ground capacitor measurement pattern：Contactor S1 is connected, device can be injected to distribution network system certain amplitude and
Zero sequence (common mode) voltage of frequency, passes through the measurement to corresponding zero sequence (common mode) electric current, you can power distribution network at this time is calculated online
The direct-to-ground capacitance of circuit.No-power compensation function still can be with normal operation at this time.
Single-phase earthing arc light eliminates pattern：The value of adjustable inductance 13 is carried by the measurement of direct-to-ground capacitance value
Preceding setting.When uniline arc grounding occurs for circuit, contactor S1 is connected, utility model device is to power distribution network three-phase line
Middle injection zero sequence (common mode) electric current or zero sequence (common mode) voltage simultaneously combine the effect of adjustable inductance 13 that can inhibit single-phase in time
The generation of arcing ground optical phenomenon, at this time no-power compensation function normal operation.The common mode current injected can offset and intercept two
A non-faulting compatibility electric current, as shown in Figure 1, so as to compensate the fault current of earth point.
Uniline earth point station-keeping mode：In case of permanent singlephase earth fault, at this time reactive-load compensation and arc light
Ground connection inhibits function normal operation, contactor S1 to remain up.Device injects the spy of certain amplitude and frequency to distribution network system
Zero sequence (common mode) voltage is levied, according to the feedback of the fault signature current detector of installation on the line, by comparing analysis three-phase
The amplitude size distribution situation of this feature current signal detected on circuit, determines the specific section of fault point.
It is described in detail below as embodiment using the 3-phase power converter of cascaded H-bridges form.
1, line mutual-ground capacitor measures
When measuring line mutual-ground capacitor, contactor S1 is closed first, U will be set in zero sequence (common mode) control access0
=Asin (ωnT), device will inject zero sequence (common mode) voltage U into distribution network line0, U0Frequency range be traditionally arranged to be 20
~90Hz, zero sequence (common mode) equivalent circuit of distribution network line is as shown in figure 4, zero sequence (common mode) electric current I at this time0Electricity can be passed through
Flow sensor measures, since the impedance of voltage transformer is generally very big, so voltage transformer branch can generally be ignored not
Meter.According to U0、I0Value can be calculate by the following formula out the direct-to-ground capacitance value of each phase line of distribution network line.
2, circuit single-phase earthing arc light inhibits (extinguishing arc)
After having measured the direct-to-ground capacitance of circuit, the inductance value of adjustable inductance 13 is adjusted to：
Wherein, LeFor the inductance value after adjustment, ω0=2 π f, f=50Hz, C are the capacitance measured.
When singlephase earth fault occurs for circuit, contactor S1 is closed first, adjustable inductance 13 can inhibit immediately
The generation of earth point electric current and arc light, at the same time, in order to reach better extinguishing arc control effect, using the zero of 3-phase power converter
Sequence (common mode) control loop, it is more accurate that arc extinction compensation electric current is injected into power distribution network, then zero sequence (common mode) is controlled logical
Road is closed, and I is then arranged0ref=j ω0CgroundUc.It may be implemented to connect by the closed-loop control of zero sequence (common mode) control access
The current control in place is close to 0, to inhibit the generation of arc grounding.
3, circuit single-phase earthing point location
When singlephase earth fault occurs for circuit, as shown in Figure 2：C phase lines are grounded by ground resistance R.In order to as early as possible
The positioning for realizing uniline earth point, can inject a certain amount of characteristic quantity by utility model device into system, coordinate
The positioning of circuit single-phase earthing point may be implemented in the fault signature current detector of installation on the line.
After singlephase earth fault occurs, contactor S1 is closed, and is then closed zero sequence (common mode) control access and is disappeared
Zero sequence (common mode) control access is set U by arc when crowbar currents fail to eliminate singlephase earth fault0=Asin (ωnT), U0
Frequency range be traditionally arranged to be 100~200Hz, at this point, in distribution network line will generate feature zero sequence (common mode) electric current, Fig. 5
In each fault signature current detector can detect characteristic component (the angular frequency ω in the three-phase current of the pointn), lead to
The characteristic component often occurred in the electric current of Earth Phase is larger, may thereby determine that it is which phase line is grounded.In determination
It is after which phase line is grounded, it is assumed herein that being that C phases are grounded, then compare 1 to No. 11 fault detector in Fig. 5
C phase detectors detected by characteristic component value size, C phases earth point as shown in Figure 5 is in No. 5 and No. 6 failures
Between indicator, then the characteristic component of C phase currents is larger in No. 5 indicators, and the feature of C phase currents is divided in No. 6 indicators
Very little is measured, then i.e. explainable characteristic current component has shunted spy from some earth point between No. 5 and No. 6 fault detectors
Levy electric current, it is possible to determine earth point position positioned at No. 5 and No. 6 fault detectors between, then by artificial line walking 5 with
Circuit between No. 6 fault detectors can find earth point specific location.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, it is clear that this field
Technical staff spirit and scope of the various modification and variations without departing from the utility model can be carried out to the utility model.This
Sample, if these modifications and variations of the present invention belong to the claims of the present invention and its equivalent technology range it
Interior, then the utility model is also intended to include these modifications and variations.
Claims (4)
1. a kind of novel mixed topology multifunctional electric power network distribution device, it is characterised in that：The device be set to generator side,
Power distribution network Circuit Fault on Secondary Transformer or power distribution network bus bar side, the device include 3-phase power converter, adjustable inductance and controllable switch；
The 3-phase power converter access generator side, power distribution network Circuit Fault on Secondary Transformer or power distribution network bus bar side, the three-phase unsteady flow
The neutral point of device can pass through adjustable inductance and controllable switch series connection ground connection；
Described device is operated in reactive-load compensation pattern under normal circumstances, and time closing controllable switch measures line-to-ground ginseng
Number changes the induction reactance value of adjustable inductance according to line-to-ground parameter value；When power distribution network occur singlephase earth fault when, it is described can
Control switch is closed, which injects zero sequence/common mode current or zero sequence/common-mode voltage into power distribution network three-phase line and combine adjustable
Formula inductance inhibits the generation of single-phase earthing arc light phenomenon in time；
When the permanent singlephase earth fault of generation, which injects characteristic current into power distribution network, the installation of line of engagement road
Fault signature current detector judges the specific section of line-to-ground point；And reactive-load compensation, the singlephase earth fault of the device
Extinguishing arc and fault location function can be carried out at the same time.
2. a kind of novel mixed topology multifunctional electric power network distribution device according to claim 1, it is characterised in that：Institute
It is two level three-phase half-bridges, three-level three-phase half-bridge, more level three-phase half-bridges or three-phase tandem type H bridges to state 3-phase power converter.
3. a kind of novel mixed topology multifunctional electric power network distribution device according to claim 1, it is characterised in that：Institute
The 3-phase power converter that 3-phase power converter is high pressure level is stated, is directly hung on the power distribution network busbar of 10kV or 35kV voltage class.
4. a kind of novel mixed topology multifunctional electric power network distribution device according to claim 1, it is characterised in that：Institute
State 3-phase power converter be low pressure grade 3-phase power converter, the 3-phase power converter by step-up transformer be connected to 10kV or
On the power distribution network busbar of 35kV voltage class.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820038580.7U CN207705795U (en) | 2018-01-10 | 2018-01-10 | A kind of novel mixed topology multifunctional electric power network distribution device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820038580.7U CN207705795U (en) | 2018-01-10 | 2018-01-10 | A kind of novel mixed topology multifunctional electric power network distribution device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207705795U true CN207705795U (en) | 2018-08-07 |
Family
ID=63033998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820038580.7U Expired - Fee Related CN207705795U (en) | 2018-01-10 | 2018-01-10 | A kind of novel mixed topology multifunctional electric power network distribution device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207705795U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979098A (en) * | 2018-01-10 | 2018-05-01 | 重庆聚陆新能源有限公司 | A kind of new mixed topology multifunctional electric power network distribution device and control method |
| CN110133446A (en) * | 2019-06-12 | 2019-08-16 | 中国石化集团胜利石油管理局有限公司电力分公司 | The earth fault line selection method and device of topological graph |
-
2018
- 2018-01-10 CN CN201820038580.7U patent/CN207705795U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979098A (en) * | 2018-01-10 | 2018-05-01 | 重庆聚陆新能源有限公司 | A kind of new mixed topology multifunctional electric power network distribution device and control method |
| CN110133446A (en) * | 2019-06-12 | 2019-08-16 | 中国石化集团胜利石油管理局有限公司电力分公司 | The earth fault line selection method and device of topological graph |
| CN110133446B (en) * | 2019-06-12 | 2021-04-13 | 中国石化集团胜利石油管理局有限公司电力分公司 | Topological graphical low-current ground fault line selection method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108054764A (en) | A kind of multifunctional ligand power grid flexible ground device and control method | |
| CN107276097B (en) | Non-effectively earthed system earth fault is mutually depressured the method for safe operation of extinguishing arc | |
| CN107979098A (en) | A kind of new mixed topology multifunctional electric power network distribution device and control method | |
| CN207705796U (en) | A kind of multifunctional ligand power grid flexible ground device | |
| CN105811383B (en) | A kind of new micro-capacitance sensor positive sequence impedance differential protecting method | |
| US11435409B2 (en) | Temporary overvoltage and ground fault overvoltage protection based on arrester current measurement and analysis | |
| CN103840437B (en) | The quick diagnosis of power distribution network ferromagnetic resonance and singlephase earth fault and processing method | |
| EP2128951B1 (en) | Electronic active earthing system for use in high-voltage distribution networks | |
| Wang et al. | A protection method for inverter-based microgrid using current-only polarity comparison | |
| CN106353642A (en) | Small current grounded line gating and tuning method based on arc suppression coil access control short time heteromorphic signal | |
| Nashawati et al. | Impacts of shunt reactors on transmission line protection | |
| CN105262076A (en) | Arc-suppression method of ground fault in neutral non-grounding system and apparatus thereof | |
| EP3108556A1 (en) | Method for detecting an open-phase condition of a transformer | |
| EP0876620A1 (en) | Method of detecting and locating a high-resistance earth fault in an electric power network | |
| CN109742727A (en) | A kind of judgment method of low pressure 400V leakage current | |
| CN110320432B (en) | Single-phase line-breaking fault detection and protection method and system | |
| CN103823160A (en) | Self-adaption ground fault line selection method and device for power distribution network | |
| CN207705795U (en) | A kind of novel mixed topology multifunctional electric power network distribution device | |
| Jalilian et al. | Distance protection of transmission lines in presence of inverter-based resources: A new earth fault detection scheme during asymmetrical power swings | |
| Zichang et al. | An identification method for asymmetric faults with line breaks based on low-voltage side data in distribution networks | |
| CN106786470A (en) | A kind of power network neutral point flexible ground system | |
| Wang et al. | A faulty line detection method for single phase-to-ground fault in resonant grounding system with CTs reversely connected | |
| CN103944156A (en) | Grounding forecasting method of arc suppression coil grounding mode | |
| CN107785883A (en) | A kind of more level active compensation devices of three-phase four-arm and control method | |
| CN205583702U (en) | Novel reactive compensation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180807 Termination date: 20210110 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |