CN111355223B - Final breaker implementation method based on breaker tripping total signal - Google Patents
Final breaker implementation method based on breaker tripping total signal Download PDFInfo
- Publication number
- CN111355223B CN111355223B CN202010181729.9A CN202010181729A CN111355223B CN 111355223 B CN111355223 B CN 111355223B CN 202010181729 A CN202010181729 A CN 202010181729A CN 111355223 B CN111355223 B CN 111355223B
- Authority
- CN
- China
- Prior art keywords
- circuit breaker
- tripping
- breaker
- protection
- final
- 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
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
-
- 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
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a final breaker realizing method based on a breaker tripping total signal, which utilizes the action of a tripping holding relay in a breaker tripping control loop as the breaker tripping total signal, and the tripping holding relay and a breaker switch position signal are connected into a final breaker protecting device, when all the associated breakers are in a closed position and all the breakers in the closed position have breaker tripping signals, the final breaker is protected to act as an outlet. On the basis of ensuring rapidity, the complexity of the implementation method of the final breaker is reduced, an access loop is simplified, the software and engineering implementation complexity of the final breaker is greatly reduced, and the safety reliability and the implementation efficiency of the protection of the final breaker are improved.
Description
Technical Field
The invention relates to a direct-current transmission technology, in particular to a final breaker implementation method based on a breaker tripping total signal.
Background
Finally, circuit breaker protection is important protection of an inverter station in a direct current transmission project, when a direct current system on an inverter side is disconnected with an alternating current system, if the direct current system is not stopped in time, high overvoltage can be formed on the alternating current system and the direct current system in the station, and equipment safety is seriously affected.
When a converter station of the high-voltage direct-current system is only connected with one transformer substation, the condition of the alternating-current system in the region is comprehensively evaluated, the function of a last breaker of a first-stage configuration converter needs to be expanded outwards, action information is transmitted to a direct-current control system of the converter station by the function, and the direct-current control system locks the direct-current system.
The last breaker tripping device of the inversion station of the high-voltage direct-current transmission system is specially designed for the situation that the inversion station or an opposite side alternating-current transformer substation suddenly cuts off all alternating-current lines which are connected with the outside of the direct-current converter station, and the main judgment basis of the last breaker tripping device is a tripping command and the state of a local alternating-current incoming line breaker; if the communication is normal, the tripping command and the state signal of the remote alternating current circuit breaker are also main criteria.
The action of the last circuit breaker protection can be judged whether to meet the action condition of the last circuit breaker according to the position state of the circuit breaker after opening, but the mode needs to be judged according to the state of the circuit breaker after opening, so that the circuit breaker opening time (generally dozens of ms) needs to be waited, in order to further shorten the overvoltage amplitude and the duration of the inversion side, the safety of primary equipment is protected, and the last circuit breaker adopts a mode of a circuit breaker tripping signal, namely before opening, the circuit breaker is judged to trip if the circuit breaker tripping signal exists, although the circuit breaker is not opened in place at the moment.
At present, the trip signal of the circuit breaker is generally adopted to connect the protection action signal of the protection device corresponding to the circuit breaker, the signals of the operation boxes TJR, TJF and the like into the final circuit breaker for protection, for 3/2 wiring, as each circuit breaker corresponds to a plurality of protection trip signals, for example, a middle switch corresponds to the protection of 1 interval two elements, and the trip signal of the operation box also has TJR, TJF and the like, the protection signal access loop of the final circuit breaker protection becomes very complex, the complexity of software implementation and engineering implementation is undoubtedly increased, and the risk of incorrect action is increased.
Disclosure of Invention
In view of the above disadvantages, the present invention provides a method for implementing a final circuit breaker based on a total tripping signal of the circuit breaker, which reduces the complexity of implementing the final circuit breaker on the basis of ensuring rapidity, and greatly reduces the complexity of software and engineering implementation of the final circuit breaker, thereby improving the safety reliability and implementation efficiency of protection of the final circuit breaker.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a final breaker realizing method based on a breaker tripping total signal utilizes tripping holding relay action in a breaker tripping control loop as the breaker tripping total signal, and the tripping holding relay action and a breaker switch position signal are connected into a final breaker protecting device together.
Further, the circuit breaker switch position signal comprises three-phase HWJ and three-phase TWJ input amount of A, B and C, and the circuit breaker tripping total signal comprises three-phase tripping signals of A, B and C of all the associated circuit breakers; and if the tripping master signal is switched in, starting the final breaker for protection.
Further, the judgment of whether the breaker is in the on-position or off-position adopts a "two out of three" logic, which specifically comprises:
when any two phases of the circuit breaker are in a closing state, the HWJ judgment output of the circuit breaker is 1, otherwise, the HWJ judgment output is 0;
when any two phases of the circuit breaker are in an opening state, the TWJ judgment output of the circuit breaker is 1, otherwise, the TWJ judgment output is 0;
when the TWJ of the circuit breaker is 0 and the HWJ is 1, judging that the circuit breaker is in the closed position, if all the related circuit breakers are in the closed position, opening the protection of the last circuit breaker, and if not, locking the protection of the last circuit breaker.
Further, when the circuit breaker is in the closed position and any two phases of tripping holding relays in a three-phase tripping loop of the circuit breaker act, the circuit breaker is judged to have a tripping signal, and the circuit breaker is opened.
Further, when all the circuit breakers in the closed position are judged to be disconnected, the circuit breakers are finally protected to act to be disconnected.
Furthermore, the last circuit breaker protection device comprises an input receiving module, a circuit breaker state judging module and an action logic judging module; the circuit breaker tripping control module is used for controlling the circuit breaker tripping operation module to open and close the circuit breaker tripping operation module; the circuit breaker state judging module judges whether the switch is in an on-position or an off-position before protection action according to the state quantity of the switch position of the circuit breaker; and the action logic judging module is combined with the circuit breaker running state and the circuit breaker tripping total signal to determine whether the circuit breaker protection is finally acted or not.
The invention uses the action of a shared relay (trip holding relay) in a trip control loop of the breaker as a total signal of the trip of the breaker, replaces a dispersed protection action signal, and is connected with a breaker switch position signal into a final breaker protection device together to realize the logic of the protection action of the final breaker. Compared with the prior art, the method has the following advantages:
1. since the trip control circuit starts the trip hold relay regardless of the trip signal such as TJR or TJF of the line protection or the operation box, it means that the circuit breaker trip procedure is started as long as the trip hold relay operates. Because the time for opening the breaker is not needed to wait, the method is quicker for tens of ms (the opening time of the breaker is generally about 50 ms) than the method for judging by adopting a breaker position relay (the action can be carried out after the breaker is opened); compared with the protection action signal of the protection device adopting the corresponding circuit breaker, the method disclosed by the invention only needs one more relay, the action time is only prolonged by 5-10 ms, the integral action time is less than 30ms, the safe and stable operation requirement of a direct current system can be met, but each circuit breaker only needs to be connected with the auxiliary contacts (namely 12TBIJA, 12TBIJB and 12 TBIJC) of the tripping holding relay in the A, B and C three-phase tripping circuit as the tripping total signal input quantity, the access input quantity is reduced by 1/4 (side switch) or even 2/5 (middle switch) compared with the protection action signal, and the access circuit is greatly simplified.
2. The operating state of the circuit breaker is judged according to the state quantity (HWJ and TWJ input quantity) of the switch position of the circuit breaker, the HWJ and the TWJ respectively adopt a 'two out of three' logic, and then the HWJ and the TWJ are inverted to form an 'AND' logic, so that the safety and the reliability are fully considered.
3. And the final circuit breaker protection action logic is that when all the associated circuit breakers at the closing position have circuit breaker tripping signals, namely all the closing position circuit breakers are judged to be disconnected, the final circuit breaker protection action is exported, and the logic is simple and clear.
Drawings
Fig. 1 is a schematic diagram of a split-phase tripping control loop of a circuit breaker in the prior art.
Fig. 2 is a logic diagram for judging the operating state of the circuit breaker according to the present invention.
Fig. 3 is the final circuit breaker protection action logic of the present invention.
Fig. 4 is a flow chart of a final circuit breaker implementation method based on a total circuit breaker trip signal of the present invention.
Fig. 5 is a schematic diagram of an ac substation on the opposite side of an ac outgoing line of a certain converter station (inverter station) according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
The invention discloses a final breaker implementation method based on a breaker tripping total signal, which utilizes the action of a shared relay (tripping holding relay) in a breaker tripping control loop as the total signal of the breaker tripping and accesses a final breaker protection device together with a switch position signal of the breaker to implement the final breaker protection action logic.
Because the trip signal such as TJR, TJF and the like of the line protection or the operation box starts the trip holding relay through the trip control loop, as long as the trip holding relay acts, namely a circuit breaker trip program is started, when the circuit breaker is separated, the trip control loop is disconnected, and the trip holding relay returns. And when any circuit breaker in the associated circuit breakers is in the closed position and the circuit breakers in the closed position have circuit breaker tripping signals, namely all the associated circuit breakers are all disconnected, finally, the circuit breaker protection action is exported (the direct current control protection blocking direct current is sent to the inverter station by a command).
And the circuit breaker protection device comprises a main function module such as an input receiving module, a circuit breaker state judging module, an action logic judging module and the like. The opening amount receiving module is used for receiving the opening amount of the total tripping signal of the circuit breaker and the position state amount (HWJ and TWJ opening amount) of the circuit breaker. And the circuit breaker state judging module judges whether the circuit breaker is in an on-position or an off-position before protection action according to the state quantity of the switch position of the circuit breaker. And the action logic judging module determines whether the protection of the final circuit breaker acts to the outlet or not by combining the running state of the circuit breaker and the tripping total signal of the circuit breaker. The method comprises the following specific steps:
step 1: and finally, the circuit breaker protection device is connected with switch position signals (each circuit breaker has an opening amount of three phases of A, B and C HWJ and a TWJ of the three phases of A, B and C) of all the associated circuit breakers and tripping total signals (tripping holding relay actions, such as 11TBIJA and 12TBIJA shown in figure 1, corresponding auxiliary contacts are closed, each circuit breaker has an opening amount of the three phases of A, B and C tripping total signals), and if the tripping total signals are opened, the protection of the last circuit breaker is started.
Step 2: and judging the running state of the associated circuit breaker according to the circuit breaker position information. As shown in fig. 2, the circuit breaker opening and closing state is determined by adopting a "two out of three" logic, that is, any two phases are closed, that is, the circuit breaker is considered to be in a closed state, that is, the HWJ determination output is 1, otherwise, the HWJ determination output is 0; and any two phases are in the open brake state, namely the circuit breaker is in the open brake state, namely the TWJ judgment output is 1, otherwise, the TWJ judgment output is 0. When the TWJ of the circuit breaker is 0 and the HWJ of the circuit breaker is 1, the circuit breaker is judged to be in the running state, and conditions are provided for subsequent logic judgment of the last circuit breaker. And if all the associated circuit breakers are in the running state, opening the protection of the last circuit breaker, and otherwise, locking the protection of the last circuit breaker.
And 3, step 3: and judging a circuit breaker action tripping signal. When the circuit breaker is in an operating state, and the tripping hold relays of any two phases in the three-phase tripping loop of the circuit breaker act, that is, the tripping total signal of the circuit breaker is open, that is, the circuit breaker is judged to act on tripping, that is, the circuit breaker is to be opened, as shown in (a) and (b) of fig. 3.
And 4, step 4: and finally judging the protection action of the circuit breaker and outputting the protection action. When all the circuit breakers in the operating state are judged to be about to be opened, the circuit breakers are finally protected and act to exit, as shown in (b) of fig. 3.
Example 1:
the technical solution implemented by the present invention is further described below with reference to a specific embodiment.
As shown in fig. 5, it is a schematic diagram of an ac substation on the opposite side of an ac outgoing line of a certain converter station (inverter station), the in-station wiring is in a 3/2 connection mode, and there are 2 strings of 4 outgoing lines in total, where lines 1 and 2 are connected to the converter station, and lines 3 and 4 are connected to other ac stations. The station is provided with a final breaker for protection, after the protection action outlet, a command is sent to the opposite side convertor station through a 2M communication channel, and then the convertor station controls protection locking direct current.
The circuit breaker implementation method is as follows:
step 1: the circuit breakers associated with the last circuit breaker include 5012, 5013, 5022, 5023. Switching in the opening quantities of the three-phase A, B and C HWJ (namely HWJa, HWJb and HWJc) and the three-phase A, B and C TWJ (TWJa, TWJb and TWJc) of the 4 breakers, and simultaneously switching in the auxiliary contacts (namely 12TBIJA, 12TBIJB and 12 TBIJC) of the tripping holding relays in the three-phase A, B and C tripping loops of the 4 breakers as the opening quantities of the tripping total signals. And when any one of the 4 circuit breakers is switched on by a tripping total signal, starting the protection of the last circuit breaker.
Step 2: the 5012, 5022 and 5023 circuit breakers run normally and are in closing positions, the 5013 circuit breakers are overhauled and are in separating positions, therefore, the opening amount of HWJa, HWJb and HWJc of the 5012, 5022 and 5023 switches is 1, and therefore the HWJ is judged to be output to be 1; 5012. 5022, 5023 switches are all 0 in the TWJa, TWJb, TWJc, so the TWJ judging output is 0. HWJa, HWJb and HWJc input amount of the 5013 switch are all 0, so that HWJ judgment output is 0; since the TWJa, TWJb, and TWJc input amounts of the 5013 switches are all 1, the TWJ determination output is 1. It is determined by the logic shown in fig. 2 that all three circuit breakers 5012, 5022 and 5023 are in an operating state (i.e., the circuit breaker operation determination output is 1), and that the circuit breaker 5013 is in a non-operating state (i.e., the circuit breaker operation determination output is 0). Thus opening the final circuit breaker protection action discrimination logic.
And 3, step 3: suppose that line 3 protection and line 2 protection act simultaneously as a three-phase trip. The protection action of the line 3 starts a tripping holding relay in a three-phase tripping loop of the 5012 breaker, after the tripping holding relay acts, the corresponding normally open auxiliary contacts are closed (namely the opening amounts of 12TBIJA, 12TBIJB and 12TBIJC are all 1), and according to the logic shown in the figure 3, the action of the 5012 breaker is judged to trip (namely the tripping signal output of the 5012 breaker is 1), so that the breaker 5012 is disconnected (namely the tripping output of the 5012 breaker is 1). Similarly, a line 2 protection action will start a trip holding relay in a 5022 and 5023 breaker three-phase trip loop, and the protection judgments 5022 and 5023 breakers act to trip (i.e. both 5022 and 5023 breaker action signal outputs are 1), so that both the 5022 and 5023 breakers will be disconnected (i.e. the 5022 breaker disconnection output is 1, and the 5023 breaker disconnection output is 1).
And 4, step 4: from the step 2 and the step 3, it can be known that 5012 circuit breaker is in operation and is judged to be disconnected, 5022 circuit breaker is in operation and is judged to be disconnected, 5023 circuit breaker is in operation and is judged to be disconnected, that is, all the circuit breakers in operation are to be disconnected, and therefore the circuit breakers are finally protected and exported.
The invention uses the action of a shared relay (trip holding relay) in a circuit breaker trip control loop as a total signal of the trip of the circuit breaker, and the total signal and a position signal of the circuit breaker are connected into a final circuit breaker protection device together to realize the logic of the protection action of the final circuit breaker. The method is adopted, and the time for opening the brake of the circuit breaker is not required to wait, so that the method is quicker for judging by adopting the position state of the circuit breaker after opening the brake by tens of ms (the opening time of the circuit breaker is generally about 50 ms); compared with the protection action signal of a protection device adopting a corresponding circuit breaker, the method only passes through one relay, the action time is only prolonged by 5-10 ms, but each circuit breaker only needs to be connected with the auxiliary contacts (namely 12TBIJA, 12TBIJB and 12 TBIJC) of the tripping holding relay in the A, B and C three-phase tripping circuit as the total tripping signal input quantity, the input quantity is reduced by 1/4 (side switch) or even 2/5 (middle switch) compared with the protection action signal, and the access circuit is greatly simplified.
In conclusion, on the basis of ensuring rapidity, the complexity of the implementation method of the final breaker is reduced, the access loop is simplified, the software and engineering implementation complexity of the final breaker is greatly reduced, and the safety reliability and the implementation efficiency of the protection of the final breaker are improved.
The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. A final breaker implementation method based on a breaker tripping total signal is characterized in that: the action of a tripping holding relay in a tripping control loop of the circuit breaker is used as a tripping total signal of the circuit breaker, the tripping total signal and a switch position signal of the circuit breaker are connected into a final circuit breaker protection device, and when all the related circuit breakers are in a closed position and all the circuit breakers in the closed position have circuit breaker tripping signals, a final circuit breaker protection action outlet is formed;
the circuit breaker switch position signals comprise three-phase HWJ and three-phase TWJ input quantities of A, B and C, and the circuit breaker tripping total signals comprise three-phase tripping signals of A, B and C of all the associated circuit breakers; if a tripping main signal is switched in, starting the protection of the final breaker;
the circuit breaker is in the judgement of closing the position or separating the position and adopts "three gets two" logic, specifically includes:
when any two phases of the circuit breaker are in a closing state, the HWJ judgment output of the circuit breaker is 1, otherwise, the HWJ judgment output is 0;
when any two phases of the circuit breaker are in an opening state, the TWJ judgment output of the circuit breaker is 1, otherwise, the TWJ judgment output is 0;
when the TWJ of the circuit breaker is 0 and the HWJ of the circuit breaker is 1, judging that the circuit breaker is in the on position, if all the associated circuit breakers are in the on position, opening the protection of the last circuit breaker, and if not, locking the protection of the last circuit breaker;
the last circuit breaker protection device comprises an input receiving module, a circuit breaker state judging module and an action logic judging module; the circuit breaker tripping control module is used for controlling the circuit breaker tripping operation module to open and close the circuit breaker tripping operation module; the circuit breaker state judging module judges whether the switch is in an on-position or an off-position before protection action according to the state quantity of the switch position of the circuit breaker; and the action logic judging module is combined with the circuit breaker running state and the circuit breaker tripping total signal to determine whether the circuit breaker protection is finally acted or not.
2. The method of claim 1, further comprising the step of: when the circuit breaker is in the closed position and any two phases of tripping holding relays in a three-phase tripping loop of the circuit breaker act, a tripping signal of the circuit breaker is judged to exist, and the circuit breaker is disconnected.
3. The method of claim 2, wherein the method comprises: and when all the circuit breakers in the closed position are judged to be disconnected, the circuit breakers are finally protected to act as outlets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010181729.9A CN111355223B (en) | 2020-03-16 | 2020-03-16 | Final breaker implementation method based on breaker tripping total signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010181729.9A CN111355223B (en) | 2020-03-16 | 2020-03-16 | Final breaker implementation method based on breaker tripping total signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111355223A CN111355223A (en) | 2020-06-30 |
| CN111355223B true CN111355223B (en) | 2022-10-11 |
Family
ID=71197615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010181729.9A Active CN111355223B (en) | 2020-03-16 | 2020-03-16 | Final breaker implementation method based on breaker tripping total signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111355223B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112217177A (en) * | 2020-09-24 | 2021-01-12 | 酒泉钢铁(集团)有限责任公司 | Tripping logic discrimination method based on grid-connected tie line light tide working condition |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203039341U (en) * | 2013-01-31 | 2013-07-03 | 中国南方电网有限责任公司超高压输电公司广州局 | Last breaker protecting and resetting device |
| CN109061451A (en) * | 2018-06-25 | 2018-12-21 | 许继集团有限公司 | A kind of monitoring method and system of hybrid dc circuit breaker arrester |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7599161B2 (en) * | 2006-12-29 | 2009-10-06 | General Electric Company | Relay device and corresponding method |
| CN201829929U (en) * | 2010-10-11 | 2011-05-11 | 靳允立 | Novel hard trip loop for large-scale thermal power unit MFT (main fuel trip) |
| CN102185278A (en) * | 2011-05-03 | 2011-09-14 | 中国电力工程顾问集团中南电力设计院 | Extra-high-voltage direct-current power transmission converter station protecting method |
| CN204441901U (en) * | 2014-06-21 | 2015-07-01 | 中国能源建设集团广东省电力设计研究院 | The discriminating gear of flexible direct current transmission converter station station level control system communication channel |
| CN104377648A (en) * | 2014-09-30 | 2015-02-25 | 南方电网科学研究院有限责任公司 | Last breaker backup protection method based on evidence theory |
| CN105576624B (en) * | 2016-02-02 | 2019-07-12 | 国家电网公司 | The implementation method of switch interlock logic in converter station alternating-current field |
| CN108832598B (en) * | 2018-05-23 | 2019-10-29 | 南京南瑞继保电气有限公司 | A kind of method, apparatus and computer storage medium of last breaker protection judgement |
| CN108832648A (en) * | 2018-05-25 | 2018-11-16 | 中国南方电网有限责任公司超高压输电公司广州局 | The last circuit breaker trip circuit self-sustaining removing method of big group of alternating current filter of converter station |
| CN109659913B (en) * | 2018-12-28 | 2020-03-10 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Last circuit breaker identification method based on virtual circuit network |
-
2020
- 2020-03-16 CN CN202010181729.9A patent/CN111355223B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203039341U (en) * | 2013-01-31 | 2013-07-03 | 中国南方电网有限责任公司超高压输电公司广州局 | Last breaker protecting and resetting device |
| CN109061451A (en) * | 2018-06-25 | 2018-12-21 | 许继集团有限公司 | A kind of monitoring method and system of hybrid dc circuit breaker arrester |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111355223A (en) | 2020-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4477855A (en) | Protecting system for transmission lines | |
| EP0948111B1 (en) | Fault protection arrangements and methods for electric power distribution systems | |
| US20020097542A1 (en) | Electric distribution device, installation comprising such a device, and electrical protection process | |
| CN108011360B (en) | Double loop round and round quickly unlinks method | |
| CN110165697A (en) | Multiterminal flexible direct current distribution system start & shutdown through one key method and device | |
| CN111355223B (en) | Final breaker implementation method based on breaker tripping total signal | |
| CN203352192U (en) | Direct current switch device | |
| JP3085007B2 (en) | Distribution electrode downsizing system and method thereof | |
| CN113629672B (en) | Method and device for rapidly and intelligently isolating faults during one-section zero-second overcurrent of power distribution network | |
| CN106159917B (en) | Power distribution network indulges the relay protection system of sequence accelerated motion | |
| CN213754084U (en) | Dual-power supply system adopting power supplies with different grounding modes | |
| JP3767100B2 (en) | Power distribution system | |
| CN111224388B (en) | Node interlocking protection method suitable for multiple power supply modes | |
| JP7181760B2 (en) | Protection control device for AC/DC converter station, protection control system for DC power transmission system, and protection control method for AC/DC converter station | |
| JP3169976B2 (en) | Distribution line ground fault protection system | |
| CN116231597B (en) | Method for realizing relay protection blocking and preventing relay protection from refusing | |
| CN110912088B (en) | Multi-terminal direct current engineering protection system based on high-speed parallel switch | |
| CN113488969B (en) | Intelligent protection device for power transmission line | |
| CN111934288B (en) | 110kV line protection wiring structure and backup power automatic switching starting method thereof | |
| CN110649622B (en) | Control circuit of unified power flow controller electrical secondary side | |
| CN110783898B (en) | AC looped network power supply dynamic acceleration overcurrent protection method and protection device | |
| CN114498898B (en) | Power supply line power attribute identification and judgment method and automatic switching method | |
| CN213768319U (en) | Control equipment of contactor of train | |
| CN111917104B (en) | Circuit for preventing misoperation of bus voltage parallel circuit | |
| JP2000166084A (en) | Distribution system |
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 |