CN105655972A - Self-adaptive leakage protection method for residual current operated protective device - Google Patents
Self-adaptive leakage protection method for residual current operated protective device Download PDFInfo
- Publication number
- CN105655972A CN105655972A CN201610208005.2A CN201610208005A CN105655972A CN 105655972 A CN105655972 A CN 105655972A CN 201610208005 A CN201610208005 A CN 201610208005A CN 105655972 A CN105655972 A CN 105655972A
- Authority
- CN
- China
- Prior art keywords
- leakage
- grade
- leakage current
- self
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000001681 protective effect Effects 0.000 title abstract description 8
- 230000008859 change Effects 0.000 claims abstract description 26
- 230000009471 action Effects 0.000 claims description 54
- 238000005096 rolling process Methods 0.000 claims description 20
- 230000009711 regulatory function Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 238000000151 deposition Methods 0.000 claims description 4
- 230000006870 function Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000007257 malfunction Effects 0.000 description 14
- 230000005611 electricity Effects 0.000 description 10
- 230000003044 adaptive effect Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000013475 authorization Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
Abstract
The invention discloses a self-adaptive leakage protection method for a residual current operated protective device. The self-adaptive leakage protection method is mainly applied to safety protection of the residual current operated protective device in a low-voltage power network distribution system, and accidents such as electric shock of a human body, electrical fires, electrical equipment damage and the like caused by electric leakage are prevented. On the basis of the characteristic that normal leakage current changes slowly along with time, a self-adaptive leakage protection model based on misoperation faults is established, and fault leakage and normal leakage can be recognized rapidly according to the change speed of the leakage current. When the leakage is judged to be normal leakage current change, a leakage operation gear value is changed automatically, self-adaptive leakage protection is realized, misoperation faults caused by normal leakage are overcome, that is, self-adaptation to the faults caused by factors such as change of the number of electric equipment, change of a power network structure, change of the atmospheric environment and the like can be realized, the leakage operation gear value is regulated automatically, so that frequent leakage protection operation is avoided, and the operation rate of a power network is increased.
Description
Technical field
The present invention relates to a kind of aftercurrent action protecting device self-adaptation earth leakage protecting method; it is specifically related to a kind of can identify fault electric leakage and normal electric leakage fast according to the change speed of leakage current; when normal leakage current changes; automatically electric leakage action gear value is changed; realize the self-adaptation protection of electric leakage of aftercurrent action protecting device, overcome the malfunction fault produced because normally leaking electricity.
Background technology
The work characteristics of aftercurrent action protecting device (also referred to as earth leakage protective device) is, when the person get an electric shock or electrical equipment leakage current exceed certain value time, protector should be able in time, reliably action; Otherwise, it should not action. At present, main exist two kinds of protection of electric leakage fault patterns, and one is tripping fault, namely when there being people to get an electric shock or when the leakage current of electrical equipment exceedes prescribed value, aftercurrent action protecting device should action and can not reliably action in time; Another kind is malfunction fault; namely when unmanned electric shock or electrical equipment electric leakage do not exceed prescribed value; aftercurrent action protecting device changes due to self action characteristic or due to the effect of various undesired signal, flase operation occurs; this will cause unnecessary power failure; make troubles to user, even cause financial loss. For tripping fault, owing to there being the big leakage current occurred instantaneously, generally become more readily available by set position valve value and satisfactorily resolve; And for malfunction fault; origin cause of formation more complicated; the increase and decrease of equipment, the change of grid branch and environmental factors change etc. all may cause this type of fault; therefore; malfunction fault puts the technical barrier urgently to be resolved hurrily in protection of electric leakage field, is also one of the difficult point and focus of electric leakage protection technology research worker research.
In order to effectively solve malfunction failure problems, it is necessary to the electric leakage situation of electrical network and electrical equipment analyzed, it is extremely important for distinguishing normal electric leakage with fault electric leakage. When person electric shock or electrical equipment electric leakage (as: grounding shell encountered by live wire), leakage current in moment, or even can have greatly changed in several milliseconds, this kind, we call that fault is leaked electricity. The normal leakage current of electrical network and electrical equipment changes along with the change of time, but its change is slowly, from a steady state to another steady state, the change time of leakage current may be several seconds, somewhat, or even several hours, we call normal electric leakage this kind, such as: owing to the humidity of the increase and decrease of equipment, the change of circuit branch and air changes the change etc. causing insulation resistance, leakage current all can be caused to change. Generally, normally leak electricity unavoidable, it is belong to normal circumstances, for this reason, when normal electric leakage occurs, aftercurrent action protecting device action need not be allowed, otherwise flase operation will be produced.
Traditional aftercurrent action protecting device is generally setting several fixing electric leakage shelves position action threshold values, when the leakage current existed in electrical network or electrical equipment exceedes this grade of position valve value, it is believed that there occurs leak current fault, will carry out protection of electric leakage. This kind of protection of electric leakage mode is simple, it is easy to realize, and can meet the protection of electric leakage needs under major part occasion. But, on the one hand, the change of normal leakage current may be owing to the increase and decrease of equipment causes, it is also possible to owing to the change of grid branch causes; On the other hand, normal leakage current also changes with the change of environment, such as, general temperature raises, and insulation impedance to be reduced, and normal leakage current increases, meanwhile, humidity also can affect normal leakage current, and the normal leakage current of electrical network generally can increase along with humidity and increase. For this reason, adopt traditional residual current protection technology, on the one hand, when setting electric leakage action shelves position threshold value and be less, often cause protection of electric leakage frequent movement, cause operation of power networks rate to reduce. Force some users without authorization by out of service for aftercurrent action protecting device, there is great protection of electric leakage hidden danger. On the other hand, when setting protection of electric leakage action shelves position threshold value and be bigger, it is possible to reduce earth leakage protective action frequency, it is to increase operation of power networks rate, but reduce earth leakage protective validity.
Summary of the invention
The present invention overcomes the above-mentioned shortcoming of prior art; propose a kind of self-adaptation earth leakage protecting method being intended to solve normal electric leakage malfunction fault; fault electric leakage and normal electric leakage can be identified fast according to the change speed of leakage current; when normal leakage current changes; automatically electric leakage action gear value is changed, it is achieved the self-adaptation earth leakage protecting method of aftercurrent action protecting device.
Aftercurrent action protecting device self-adaptation earth leakage protecting method of the present invention, comprises following step:
Step 1: after aftercurrent action protecting device starting up, initialize parameter, and leakage current shelves position l is setgradeFor maximum position h shelves;
Step 2: run and enter system major cycle, every 50 milliseconds gather current leakage current value Ileak;
Step 3: be m at capacity0In secondary rolling window, CPU calculates the absolute value of adjacent twice leakage currentSize;
Step 4: the adjacent twice leakage current absolute value obtained will be calculatedWith leakage current increment valve value �� IleakCompare, if metThen counter m adds 1;
Step 5: within the rolling window phase, if m is < m0Time, then judge that this kind of situation belongs to normal electric leakage, open leakage current shelves position lgradeAutomatic regulatory function; Otherwise, then judge that it belongs to fault electric leakage, close its grade of position lgradeAutomatic regulatory function, carries out respective handling by fault electric leakage;
Step 6: complete leakage current shelves position lgradeAutomatically regulate or after leak current fault process, return the 2nd step and perform again and again, it is achieved the self-adaptation creepage protection function of aftercurrent action protecting device.
Further, rolling window described in step 3 is described below:
Rolling window is a data queue of capacity constraint, deposits the continuous m of collection recently by first outer0Secondary leakage data, namely when rolling stored in a new leakage data, the earliest stored in data rolling is abandoned, within the window phase, remain the continuous m depositing collection recently0Secondary leakage data.
Further, in described step 5, when aftercurrent action protecting device judges that current electric leakage genus normally leaks electricity, then start the automatic regulatory function in shelves position, it is achieved the Automatic adjusument protection of shelves position, the malfunction fault of generation when effectively prevent normal electric leakage. Leakage current shelves position lgradeAutomatic adjustment method, its process is as follows:
(S1) ifThen lgradeIt is set to the 1st grade;
(S2) ifThen lgradeIt is set to the 2nd grade;
(S3) ifThen lgradeIt is set to the 3rd grade;
����
(S4) ifThen lgradeIt is set to i-th grade, (i=3 ..., h, wherein h is the maximum figure place of leakage current);
In formula,
I leakage current value before the gathered, whereinFor the leakage current value I that current (or this) gathersleak;
��Ileak: leakage current increment valve value;
I-th grade of leakage current operating valve value;
lgrade: leakage current shelves position.
Self-adaptation earth leakage protective electric leakage action shelves potential energy enough regulates automatically along with the changing conditions of normal electric leakage, it is not necessary to artificially adjust. Based on this, it is necessary to first set up the model of electric leakage adaptive guard, to identify normal electric leakage fast, thus realize electric leakage available protecting. The characteristic according to electric current in normal electric leakage situation with slowly change, the aftercurrent action protecting device shelves position adaptive protection model of foundation, its basic ideas are: when leakage current is greater than the action threshold value of electric leakage shelves position, carry out protection of electric leakage; When leakage current is in certain limits, electric leakage action threshold value is constant; When leakage current exceeds prescribed limits scope, and after the time length is greater than certain time, changing responding value, electric leakage action threshold value is floated. By above-mentioned steps, establish aftercurrent action protecting device shelves position adaptive protection model, it is achieved that the Automatic adjusument protection of shelves position, the malfunction fault produced when effectively prevent normal electric leakage relatively for convenience.
The present invention has a characteristic that electric current slowly changes and the self-adaptation protection of electric leakage model establishing malfunction fault based on normal electric leakage; fault electric leakage and normal electric leakage can be identified fast; thus the shelves position of the change Automatic adjusument electric leakage action according to electric current, efficiently solve and when traditional method is normally leaked electricity, easily produce the defects such as malfunction fault. Thus effectively overcome that the protection of electric leakage action that prior art causes is frequent, operation of power networks rate reduces, the defects such as great protection of electric leakage hidden danger easily occur.
The advantage of the present invention is mainly reflected in the following aspects:
1, self-adaptation earth leakage protecting method of the present invention, there is the characteristic that electric current slowly changes and the self-adaptation protection of electric leakage model establishing malfunction fault based on normal electric leakage, fault electric leakage and normal electric leakage can be identified fast, effectively overcome and traditionally normally electric leakage is regarded as the defect of fault handling;
2, self-adaptation earth leakage protecting method of the present invention, when occurring normally to leak electricity, can according to the shelves position of the change Automatic adjusument electric leakage action of electric current, efficiently solve and when traditional method is normally leaked electricity, easily produce the defects such as malfunction fault, thus effectively overcome that the protection of electric leakage action that prior art causes is frequent, operation of power networks rate reduces, the defects such as great protection of electric leakage hidden danger easily occur;
3, self-adaptation earth leakage protecting method of the present invention; principle is simple, reliable results, realization convenience, suitability are strong; fault electric leakage and normal electric leakage can be identified fast, thus effectively and stablely reach the aftercurrent action protecting earth leakage protective target call of device self-adaptation.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is the aftercurrent action protecting device adaptive workflow journey figure of the present invention;
Fig. 2 is the rolling window schematic diagram of the present invention;
The aftercurrent action protecting device shelves position that Fig. 3 is the present invention regulates schema automatically.
Embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail. It is to be understood that preferred embodiment is only in order to illustrate the present invention, instead of in order to limit the scope of the invention.
As shown in Figure 1; the self-adaptation earth leakage protecting method of aftercurrent action protecting device of the present invention; there is the characteristic that electric current slowly changes and the self-adaptation protection of electric leakage model establishing malfunction fault based on normal electric leakage; fault electric leakage and normal electric leakage can be identified fast; when occurring normally to leak electricity; according to the shelves position of the change Automatic adjusument electric leakage action of electric current, thus the self-adaptation protection of electric leakage of aftercurrent action protecting device can be realized. This self-adaptation earth leakage protecting method performing step is as follows:
Step 1: after aftercurrent action protecting device starting up, initialize parameter, arranges m0=5, m=3, �� Ileak=20 milliamperes and leakage current shelves position lgradeFor maximum position h shelves;
Step 2: run and enter system major cycle, opens motor and carries out combined floodgate work, complete the collection of voltage, load current simultaneously, and every 50 milliseconds gather current leakage current value Ileak;
Step 3: be m at capacity0In secondary rolling window, CPU calculates the absolute value of adjacent twice leakage currentSize;
Step 4: the adjacent twice leakage current absolute value obtained will be calculatedWith leakage current increment valve value �� IleakCompare, if metThen counter m adds 1;
Step 5: within the rolling window phase, if m is < m0Time, then judge that this kind of situation belongs to normal electric leakage, open leakage current shelves position lgradeAutomatic regulatory function; Otherwise, then judge that it belongs to fault electric leakage, close its grade of position lgradeAutomatic regulatory function, carries out respective handling by fault electric leakage;
Step 6: complete leakage current shelves position lgradeAutomatically regulate or after leak current fault process, return the 2nd step and perform again and again, it is achieved the self-adaptation creepage protection function of aftercurrent action protecting device.
Aforesaid method has the characteristic of slowly change according to electric current in normal electric leakage situation, establishes aftercurrent action protecting device shelves position adaptive protection model, it is possible to identify fault electric leakage and normal electric leakage fast according to the change speed of leakage current. The mentality of designing of aforesaid method is: when leakage current is greater than the action threshold value of electric leakage shelves position, carry out protection of electric leakage; When leakage current is in certain limits, electric leakage action threshold value is constant; When leakage current exceeds prescribed limits scope, and after the time length is greater than certain time, changing responding value, electric leakage action threshold value is floated.
Further, rolling window described in step 3 is mainly used in depositing nearest m0Secondary data, as shown in Figure 2, rolling window is a data queue of capacity constraint, deposits the continuous m of collection recently by first outer0Secondary leakage data, namely when rolling stored in a new leakage data, the earliest stored in data rolling is abandoned, within the window phase, remain the continuous m depositing collection recently0Secondary leakage data.
The design philosophy of aforesaid method derives from following experience practice: at the m of nearest continuous acquisition0In secondary leakage current (that is: within the rolling window phase (in a certain time range)), the change fluctuation of twice next-door neighbour's leakage current exceedes leakage current increment valve value �� IleakNumber of times be less than m0Secondary, then judge that leakage current during this period is in normal electric leakage, otherwise, it is judged to that fault is leaked electricity.
Further, in described step 5, when aftercurrent action protecting device judges that current electric leakage genus normally leaks electricity, then start the automatic regulatory function in shelves position, it is achieved the Automatic adjusument protection of shelves position, the malfunction fault of generation when effectively prevent normal electric leakage. Leakage current shelves position lgradeAs shown in Figure 3, its process is as follows for Automatic adjustment method:
(S1) ifThen lgradeIt is set to the 1st grade;
(S2) ifThen lgradeIt is set to the 2nd grade;
(S3) ifThen lgradeIt is set to the 3rd grade;
......
(S4) ifThen lgradeIt is set to i-th grade, (i=3 ..., h, wherein h is the maximum figure place of leakage current);
In formula,
I leakage current value before the gathered, whereinFor the leakage current value I that current (or this) gathersleak;
��Ileak: leakage current increment valve value;
I-th grade of leakage current operating valve value;
lgrade: leakage current shelves position.
Claims (3)
1. aftercurrent action protecting device self-adaptation earth leakage protecting method; its feature is being: after comprising the startup of aftercurrent action protecting device; fault electric leakage and normal electric leakage can be identified fast according to the change speed of leakage current, then realize protection of electric leakage according to electric leakage type, comprise the following steps:
Step 1: after aftercurrent action protecting device starting up, initialize parameter, and leakage current shelves position l is setgradeFor maximum position h shelves;
Step 2: run and enter system major cycle, every 50 milliseconds gather current leakage current value Ileak;
Step 3: be m at capacity0In secondary rolling window, CPU calculates the absolute value of adjacent twice leakage currentSize;
Step 4: the adjacent twice leakage current absolute value obtained will be calculatedWith leakage current increment valve value �� IleakCompare, if metThen counter m adds 1;
Step 5: within the rolling window phase, if m is < m0Time, then judge that this kind of situation belongs to normal electric leakage, open leakage current shelves position lgradeAutomatic regulatory function; Otherwise, then judge that it belongs to fault electric leakage, close its grade of position lgradeAutomatic regulatory function, carries out respective handling by fault electric leakage;
Step 6: complete leakage current shelves position lgradeAutomatically regulate or after leak current fault process, return the 2nd step and perform again and again, it is achieved the self-adaptation creepage protection function of aftercurrent action protecting device.
2. aftercurrent action protecting device self-adaptation earth leakage protecting method according to claim 1, it is characterised in that: the rolling window described in step 3 is described below:
Rolling window is a data queue of capacity constraint, deposits the continuous m of collection recently by first outer0Secondary leakage data, namely when rolling stored in a new leakage data, the earliest stored in data rolling is abandoned, within the window phase, remain the continuous m depositing collection recently0Secondary leakage data.
3. aftercurrent action protecting device self-adaptation earth leakage protecting method according to claim 1, it is characterised in that: the leakage current shelves position l described in step 5gradeAutomatic adjustment method, its process is as follows:
(S1) ifThen lgradeIt is set to the 1st grade;
(S2) ifThen lgradeIt is set to the 2nd grade;
(S3) ifThen lgradeIt is set to the 3rd grade;
......
(S4) ifThen lgradeIt is set to i-th grade, (i=3 ..., h, wherein h is the maximum figure place of leakage current);
In formula,
I leakage current value before the gathered, whereinFor the leakage current value I that current (or this) gathersleak;
��Ileak: leakage current increment valve value;
I-th grade of leakage current operating valve value;
lgrade: leakage current shelves position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610208005.2A CN105655972B (en) | 2016-04-05 | 2016-04-05 | The adaptive earth leakage protecting method of RCD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610208005.2A CN105655972B (en) | 2016-04-05 | 2016-04-05 | The adaptive earth leakage protecting method of RCD |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105655972A true CN105655972A (en) | 2016-06-08 |
| CN105655972B CN105655972B (en) | 2018-02-13 |
Family
ID=56496959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610208005.2A Active CN105655972B (en) | 2016-04-05 | 2016-04-05 | The adaptive earth leakage protecting method of RCD |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105655972B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306256A (en) * | 2018-02-08 | 2018-07-20 | 常熟开关制造有限公司(原常熟开关厂） | Prevent the method and residual current circuit breaker of residual current circuit breaker malfunction |
| CN109861193A (en) * | 2018-12-29 | 2019-06-07 | 樊嵩 | A kind of earth leakage protecting method and its system of electric cabinet |
| CN113376545A (en) * | 2020-11-13 | 2021-09-10 | 国网江西省电力有限公司柘林水电厂 | Method for detecting relative abnormal signal of leakage current of hydropower station |
| CN116404611A (en) * | 2023-06-07 | 2023-07-07 | 佳源科技股份有限公司 | Leakage current protection method and leakage current protection system for photovoltaic grid-connected circuit breaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485093A (en) * | 1993-10-15 | 1996-01-16 | The Texas A & M University System | Randomness fault detection system |
| JP2004153877A (en) * | 2002-10-28 | 2004-05-27 | Matsushita Electric Works Ltd | Method of discriminating arc current, and arc current discriminator |
| CN201838982U (en) * | 2010-06-25 | 2011-05-18 | 北京Abb低压电器有限公司 | Residual current protection device and circuit breaker using same |
| CN103887660A (en) * | 2014-03-31 | 2014-06-25 | 常熟市立得电器有限公司 | Earth leakage protection plug capable of being switched between three-pole mode and two-pole mode |
-
2016
- 2016-04-05 CN CN201610208005.2A patent/CN105655972B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485093A (en) * | 1993-10-15 | 1996-01-16 | The Texas A & M University System | Randomness fault detection system |
| JP2004153877A (en) * | 2002-10-28 | 2004-05-27 | Matsushita Electric Works Ltd | Method of discriminating arc current, and arc current discriminator |
| CN201838982U (en) * | 2010-06-25 | 2011-05-18 | 北京Abb低压电器有限公司 | Residual current protection device and circuit breaker using same |
| CN103887660A (en) * | 2014-03-31 | 2014-06-25 | 常熟市立得电器有限公司 | Earth leakage protection plug capable of being switched between three-pole mode and two-pole mode |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306256A (en) * | 2018-02-08 | 2018-07-20 | 常熟开关制造有限公司(原常熟开关厂） | Prevent the method and residual current circuit breaker of residual current circuit breaker malfunction |
| CN108306256B (en) * | 2018-02-08 | 2019-07-30 | 常熟开关制造有限公司(原常熟开关厂） | Prevent the method and residual current circuit breaker of residual current circuit breaker malfunction |
| CN109861193A (en) * | 2018-12-29 | 2019-06-07 | 樊嵩 | A kind of earth leakage protecting method and its system of electric cabinet |
| CN109861193B (en) * | 2018-12-29 | 2021-03-26 | 樊嵩 | Leakage protection method and system of electric cabinet |
| CN113376545A (en) * | 2020-11-13 | 2021-09-10 | 国网江西省电力有限公司柘林水电厂 | Method for detecting relative abnormal signal of leakage current of hydropower station |
| CN116404611A (en) * | 2023-06-07 | 2023-07-07 | 佳源科技股份有限公司 | Leakage current protection method and leakage current protection system for photovoltaic grid-connected circuit breaker |
| CN116404611B (en) * | 2023-06-07 | 2023-09-08 | 佳源科技股份有限公司 | Leakage current protection method and leakage current protection system for photovoltaic grid-connected circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105655972B (en) | 2018-02-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11128127B2 (en) | FLISR without communication | |
| CN105655972A (en) | Self-adaptive leakage protection method for residual current operated protective device | |
| US20170163029A1 (en) | Securing Against Malicious Control of Circuit Breakers in Electrical Substations | |
| CN102664391B (en) | Substation area island protection method and substation area island protection system | |
| CN103956717A (en) | Self-adaption microgrid overcurrent protection method | |
| CN103956716A (en) | Micro-grid dynamic self-adapting relay protection method and self-adapting protection device | |
| CN106253336A (en) | Distributed power source isolated island effect prevention relay protecting method | |
| Jin et al. | A novel single-phase-to-ground fault identification and isolation strategy in wind farm collector line | |
| CN104242273A (en) | Self-adaptation positive sequence current quick breaking protection method for power grid containing inverter-based DG (distributed generation) | |
| He et al. | An adaptive distance relay based on transient error estimation of CVT | |
| CN112421615A (en) | Power distribution station self-healing control method and system based on intelligent breaker action | |
| CN107221919A (en) | A kind of method for improving the power distribution network reliability of relay protection containing distributed power source | |
| CN208656407U (en) | The protection system for preventing mediate contact from getting an electric shock | |
| CN102636705A (en) | Device for judging fault of remote leakage protector and blockage or fault of alternating current contactor, and analysis method thereof | |
| CN116865205B (en) | Wireless breaker fault early warning method and system | |
| CN201066671Y (en) | Monitoring residual current action protection relay | |
| CN108336717A (en) | One kind opens that machine process is region-wide to open machine guard method suitable for phase modifier transformer group | |
| CN205178493U (en) | Modular neutal point earthing composite control device | |
| CN112803376A (en) | Power distribution network protection coordination method after grid connection of photovoltaic power supply | |
| CN104319748B (en) | Quick adjustment method for parallel line branching factor in substation area distance protection section III | |
| Adly et al. | Optimal reclosing time to improve transient stability in distribution system | |
| CN105529737A (en) | Power network splitting device and method | |
| CN105048437A (en) | Combined neutral point grounding integrated control device | |
| Wu | An adaptive limited wide area differential protection for power grid with micro-sources | |
| CN103075206B (en) | Thermal power unit overspeed protection method based on controlling of safety automatic device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231113 Address after: 325600 upstream industrial zone, Longjing Village, Liushi Town, Leqing City, Wenzhou City, Zhejiang Province Patentee after: Zhejiang Chuangjia Intelligent Electrical Appliance Co.,Ltd. Address before: 310014 science and technology office, Zhejiang University of Technology, No. 18 Chao Wang Road, Xiacheng District, Hangzhou, Zhejiang Patentee before: JIANG University OF TECHNOLOGY |
|
| TR01 | Transfer of patent right |