CN118399344B - Relay protection device for power system - Google Patents
Relay protection device for power system Download PDFInfo
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- CN118399344B CN118399344B CN202410810642.1A CN202410810642A CN118399344B CN 118399344 B CN118399344 B CN 118399344B CN 202410810642 A CN202410810642 A CN 202410810642A CN 118399344 B CN118399344 B CN 118399344B
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- 238000000034 method Methods 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims description 32
- 230000000875 corresponding effect Effects 0.000 claims description 28
- 238000005070 sampling Methods 0.000 claims description 22
- 238000005259 measurement Methods 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 7
- 239000013589 supplement Substances 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
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Classifications
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- 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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- 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
- H02H3/08—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 excess current
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- 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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/263—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 involving signal transmission between at least two stations involving transmissions of measured values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a relay protection device for an electric power system, which belongs to the field of emergency protection circuit devices, and is characterized in that a plurality of current parameter value ranges and a plurality of execution instructions corresponding to the current parameter value ranges are preset, after current is acquired, when current data belong to a certain current parameter value range, the execution instructions corresponding to the current parameter value ranges are directly selected and transmitted to a circuit breaker, so that a series of logic judgment process according to current in the prior art can be effectively omitted, relay protection action time is shortened, safety of the electric power system is improved, when the current data do not belong to any current parameter value range, a new execution instruction is generated through logic judgment and transmitted to the circuit breaker, and a double-line switching circuit is arranged between a relay protection main body and the circuit breaker, and when the circuit breaker does not break according to the execution instruction, automatic fusing of the circuit can be realized by switching the current to the circuit with a fuse, and a secondary protection electric power effect is achieved for the electric power system.
Description
Technical Field
The invention relates to a relay protection device, in particular to a relay protection device for an electric power system, which is applied to the field of emergency protection circuit devices.
Background
Relay protection is an automated measure and device that can send out warning signals to operators on duty in time when a power element (such as a generator, a line, etc.) in a power system or the power system itself breaks down to endanger the safe operation of the power system, or directly send out tripping commands to a controlled circuit breaker to terminate the development of these events, and a complete set of equipment for implementing such automated measures is generally known as a relay protection device.
The specification of Chinese patent CN202011456723.4 discloses a relay protection device and a relay protection method for a circuit of a power distribution automation system, wherein on the premise that a multi-phase fault occurs on an outgoing line and zero sequence current exceeds standard, an A-phase or C-phase current relay is adopted to trip; when two outgoing lines on the same bus have different single-phase grounding faults, as the action time of the phase A and the phase C is provided with a delay level difference, when the outgoing line breaker of one outgoing line is firstly tripped, the overline short circuit fault between the two lines is eliminated, and the other outgoing line can continue to run for a period of time in a single-phase grounding mode, so that the power failure range is reduced, the power transmission recovery time of a power distribution automation system is shortened, and the economic loss is reduced.
In general, the whole relay protection device consists of three parts, namely a measuring element, a logic link and an execution output: 1. the measurement comparison part is used for measuring the physical parameters passing through the protected electric element, comparing the physical parameters with a given value and giving a group of logic signals with 'yes' and 'no' properties according to the comparison result so as to judge whether the protection device should be started or not; 2. the logic part enables the protection device to judge the type and the range of the fault according to a certain logic relation, finally determines whether to trip the breaker, send out a signal, act, delay time and the like, and transmits a corresponding instruction to the execution output part; 3. and the execution output part finally completes the task born by the protection device according to the instruction transmitted by the logic. If the operation is tripping in the case of failure, a signal is sent out in the case of abnormal operation.
The whole group of action time of relay protection refers to the time from judging faults to the action of the outlet of the final device, after the current is collected, the current is required to be subjected to corresponding logic judgment according to a fixed logic program in the existing relay protection, so that the final instruction of the circuit breaker can be determined, and a certain action time exists in the process, so that the relay protection is not rapid enough, and in addition, when the instruction is conveyed to the circuit breaker, the circuit breaker does not execute the corresponding instruction due to the faults of the circuit or the circuit breaker.
Disclosure of Invention
Aiming at the prior art, the technical problem to be solved by the invention is that the current of the existing relay protection needs to be subjected to corresponding logic judgment according to a fixed logic program after the current is collected, so that the final instruction of the circuit breaker can be determined, and a certain action time exists in the process, so that the relay protection is not rapid enough, and when the instruction is transmitted to the circuit breaker, the circuit breaker does not execute the corresponding instruction due to the fault of a circuit or the circuit breaker.
In order to solve the problems, the invention provides a relay protection device for an electric power system, which comprises a relay protection main body and an automatic protection system, wherein the automatic protection system comprises a parameter setting module, a sampling measuring module, a double logic system and a command output module;
The sampling measurement module is connected with a parameter database, and the parameter database stores a plurality of current parameter ranges preset by the parameter setting module;
The double logic system comprises a selected logic module and a judging logic module, wherein the selected logic module is connected with a logic instruction database, the logic instruction database stores execution instructions which are in one-to-one correspondence with various current parameter value ranges, and the judging logic module is connected with the parameter setting module;
The sampling measurement module is used for comparing the current in the operation of the protected power system with the current parameter value range in the parameter database and transmitting information to one of the selected logic module or the judging logic module according to the comparison result;
the command output module controls the circuit breaker on the power system to perform corresponding actions according to the command transmitted from the selected logic module or the judging logic module.
The relay protection device for the power system comprises the following steps:
S1, collecting current in the operation of the power system in real time through a sampling measurement module, when the current data belongs to a certain current parameter range in a parameter database, performing step S2, when the current data does not belong to any current parameter range in the parameter database, comparing the sizes of the current data, performing step S3,
S2, the sampling and measuring module transmits the current parameter value range to a selected logic module, the selected logic module selects an execution instruction corresponding to the current parameter value range from a logic instruction database and transmits the execution instruction to the command output module, and then the step S4 is performed;
S3, the sampling measurement module transmits the collected current data and the magnitude comparison result to the judgment logic module, the judgment logic module judges the fault type according to the logic program of the judgment logic module, then a new execution instruction is generated, the new execution instruction of the judgment logic module is transmitted to the command output module, and then the step S4 is carried out;
S4, the command output module transmits the execution command to the circuit breaker to enable the circuit breaker to perform corresponding actions.
As a further supplement of the present application, in step S3, the judgment logic module further transmits a new execution instruction and current data to the parameter setting module, and the parameter setting module supplements the current data to the parameter database and supplements the new execution instruction to the logic instruction database as an execution instruction corresponding to the current data.
As another improvement of the application, the data transmission is realized between the relay protection main body and the circuit breaker through a two-wire switching circuit, and the command output module is also connected with an active quick-break module.
As a further improvement of the present application, the two-wire switching line includes a switching switch provided between the relay protection main body and the circuit breaker, data transmission is realized between the relay protection main body and the switching switch through a power line, and data transmission is realized between the switching switch and the circuit breaker through one of a main power transmission line or a self-breaking line.
As a further improvement of the application, the self-breaking line comprises a power transmission line and a fuse electrically connected to the power transmission line, and the change-over switch is in circuit communication with the main power transmission line in an initial state.
As a further improvement of the present application, the following steps are further included after step S4: when the breaker does not act according to the execution instruction within the set time, the active quick-break module is started to conduct secondary automatic disconnection on the line.
As a further improvement of the present application, the secondary autonomous disconnection process is specifically as follows: the active quick-break module controls the change-over switch to switch the circuit, so that the change-over switch is disconnected with the main power transmission line, the connection with the self-break circuit is realized, the current running in the power system is transmitted on the self-break circuit, and when the current overload exceeds the specified time, the fuse is directly fused, so that the power supply to the circuit breaker is disconnected.
As another improvement of the application, in the secondary automatic disconnection process, the sampling measurement module keeps the action of collecting the running current of the power system in real time for comparison, and when the fuse is not fused beyond the specified time and the current data collected at the moment is in a certain current parameter range, the active quick disconnection module controls the change-over switch to conduct circuit switching again, disconnects the connection with the self-disconnection circuit and resumes the circuit connection with the main power transmission line.
In summary, the application sets multiple current parameter ranges and multiple executing instructions corresponding to the current parameter ranges in advance according to the running environment of the power system, collects the current in the running process of the power system in real time through the sampling and measuring module, when the current data belong to a certain current parameter range, directly selects the executing instruction corresponding to the current parameter range through the selected logic module, and transmits the executing instruction to the circuit breaker to make the circuit breaker perform corresponding action, thus effectively saving the process of performing a series of logic judgment according to the current in the prior art, the relay protection action time is reduced, the safety of the power system is improved, when current data does not belong to any current parameter range, a new execution instruction is generated through logic judgment and is transmitted to the circuit breaker, data transmission of a relay protection main body and the circuit breaker is realized through setting a double-wire switching circuit, and under the condition that the circuit breaker is not broken according to the execution instruction, the current is switched to the circuit with the fuse, so that the circuit can be automatically fused, and a secondary protection power effect is achieved on the power system.
Drawings
FIG. 1 is a system diagram of embodiment 1 of the present application;
FIG. 2 is a flow chart of embodiment 1 of the present application;
Fig. 3 is a schematic diagram of a circuit connection according to embodiment 2 of the present application;
fig. 4 is a second schematic diagram of a circuit connection according to embodiment 2 of the present application;
Fig. 5 is a third schematic diagram of the circuit connection of embodiment 2 of the present application.
The reference numerals in the figures illustrate:
1 relay protection main body, 2 power line, 3 change-over switch, 4 main transmission line, 5 self-breaking line, 51 transmission line, 52 fuse.
Detailed Description
2 Embodiments of the present application will be described in detail with reference to the accompanying drawings.
Embodiment 1:
the invention provides a relay protection device for an electric power system, referring to fig. 1, comprising a relay protection main body 1 and an automatic protection system, wherein the automatic protection system comprises a parameter setting module, a sampling measuring module, a double logic system and a command output module;
The sampling measurement module is connected with a parameter database, and the parameter database stores various current parameter ranges preset by the parameter setting module, such as I1-I2, I2-I3 and I3-I4.. In-Im, wherein I1 is less than I2 and I3 is less than I4 and is less than In;
The double logic system comprises a selected logic module and a judging logic module, wherein the selected logic module is connected with a logic instruction database, the logic instruction database stores execution instructions which are In one-to-one correspondence with various current parameter value ranges, the execution instructions comprise P1 (corresponding to the current parameter value ranges I1-I2), P2 (corresponding to the current parameter value ranges I2-I3) and P3 (corresponding to the current parameter value ranges I3-I4). Pn (corresponding to the current parameter value ranges In-Im), and the content of the execution instructions comprises, but is not limited to, whether tripping occurs, whether signals are sent out, whether delay occurs or not and the like.
The judging logic module is connected with the parameter setting module, when the collected current is not in any current parameter range, the judging logic module carries out logic judgment on the current and obtains a new execution instruction, and at the moment, the parameter setting module can respectively add the current and the corresponding execution instruction into the parameter database and the logic instruction database.
The sampling measurement module is used for comparing the current in the operation of the protected power system with the current parameter range in the parameter database, transmitting information to one of the selected logic module or the judging logic module according to the comparison result, and controlling the circuit breaker on the power system to perform corresponding actions according to the command transmitted from the selected logic module or the judging logic module.
Referring to fig. 2, a relay protection device for an electric power system, the application method thereof includes the following steps:
S1, collecting current in the operation of the power system in real time through a sampling measurement module, when the current data belongs to a certain current parameter range in a parameter database, performing step S2, when the current data does not belong to any current parameter range in the parameter database, comparing the sizes of the current data, performing step S3,
S2, the sampling and measuring module transmits the current parameter value range to a selected logic module, the selected logic module selects an execution instruction corresponding to the current parameter value range from a logic instruction database and transmits the execution instruction to the command output module, and then the step S4 is performed;
by selecting the corresponding execution instruction according to the current parameter range to which the current belongs, the process of carrying out logic series logic judgment according to the current in the prior art can be omitted, the relay protection action time is effectively reduced, and the relay can rapidly carry out corresponding actions;
S3, the sampling measurement module transmits the collected current data and the magnitude comparison result to the judgment logic module, the judgment logic module judges the fault type according to the logic program of the judgment logic module, then a new execution instruction is generated, the new execution instruction of the judgment logic module is transmitted to the command output module, and then the step S4 is carried out;
S4, the command output module transmits the execution command to the circuit breaker to enable the circuit breaker to perform corresponding actions.
In step S3, the judging logic module further transmits the new execution instruction and the current data to the parameter setting module, the parameter setting module supplements the current data to the parameter database, supplements the new execution instruction to the logic instruction database as the execution instruction corresponding to the current data, and thus when the same current is acquired next time, the corresponding execution instruction can be directly selected to perform the action without performing a series of logic judgment again.
Embodiment 2:
The present embodiment is added to embodiment 1 as follows: with reference to fig. 1 and 3, data transmission is realized between the relay protection main body 1 and the circuit breaker through a double-line switching circuit, the command output module is also connected with an active quick-break module, the double-line switching circuit comprises a switch 3 arranged between the relay protection main body 1 and the circuit breaker, data transmission is realized between the relay protection main body 1 and the switch 3 through a power line 2, data transmission is realized between the switch 3 and the circuit breaker through one of a main power transmission line 4 or a self-break line 5, referring to fig. 4, the self-break line 5 comprises a power transmission line 51 and a fuse 52 electrically connected to the power transmission line 51, and the switch 3 is in circuit communication with the main power transmission line 4 in an initial state.
By the above arrangement, the following steps are further included after step S4: when the breaker does not act according to the execution instruction within the set time, the active quick-break module is started to conduct secondary automatic disconnection on the line.
When the circuit breaker exceeds the set time and does not act according to the execution instruction, the circuit or the circuit breaker can be indicated to have faults, and at the moment, in order to break the circuit in time, an active quick breaking module can be started, and the secondary autonomous breaking process is specifically as follows: with reference to fig. 4 and 5, the active quick-break module controls the change-over switch 3 to perform circuit switching, so that the change-over switch is disconnected from the main power transmission line 4, and the connection with the self-break line 5 is realized, at this time, the current running in the power system is transmitted on the self-break line 5, and when the current overload exceeds the prescribed time, the fuse 52 is directly fused, so that the power supply to the circuit breaker is disconnected.
In the secondary autonomous disconnection process, the sampling measurement module keeps the action of collecting the running current of the power system in real time for comparison, and when the fuse 52 is not fused for more than the specified time and the current data collected at the moment is in a certain current parameter range, the active quick disconnection module controls the change-over switch 3 to switch the circuit again, disconnects the connection with the self-disconnection circuit 5 and resumes the circuit communication with the main power transmission line 4.
When the fuse 52 is not fused for a period of time exceeding the prescribed period of time, it may indicate that the line current is not always in an overload state, and at this time, if the collected current is within a certain current parameter range, it may further indicate that the current has recovered to be normal, so that at this time, the circuit connection between the diverter switch 3 and the main power transmission line 4 may be recovered, i.e. the initial monitoring protection state of the line is recovered.
According to the embodiment, a second protection measure can be provided for line faults through the double-line switching circuit, under the condition that the circuit breaker does not break according to an execution instruction, current is transmitted on the circuit provided with the fuse 52 through the switching circuit, whether the current is continuously abnormal or not can be judged to a certain extent through the existence of the fuse 52 in the fusing process, on one hand, under the condition that the current is continuously abnormal and overloaded, the fuse is realized through self-heating of the fuse 52, under the condition that the circuit breaker does not break normally, the safety of a power system is effectively protected, and on the other hand, when the current is not continuously overloaded, the normal communication with the circuit breaker can be timely recovered, and the monitoring and the protection are continuously carried out.
The present application is not limited to the above-described embodiments, which are adopted in connection with the actual demands, and various changes made by the person skilled in the art without departing from the spirit of the present application are still within the scope of the present application.
Claims (2)
1. A overload protection device for electric power system, its characterized in that: the automatic protection system comprises a relay protection main body (1) and an automatic protection system, wherein the automatic protection system comprises a parameter setting module, a sampling and measuring module, a double logic system and a command output module;
The sampling measurement module is connected with a parameter database, and the parameter database stores a plurality of current parameter value ranges preset by a parameter setting module;
The double logic system comprises a selected logic module and a judging logic module, wherein the selected logic module is connected with a logic instruction database, the logic instruction database stores execution instructions which are in one-to-one correspondence with various current parameter ranges, and the judging logic module is connected with a parameter setting module;
the sampling measurement module is used for comparing the current in the operation of the protected power system with the current parameter value range in the parameter database and transmitting information to one of the selected logic module or the judging logic module according to the comparison result;
the command output module controls a breaker on the power system to perform corresponding actions according to commands transmitted from the selected logic module or the judging logic module;
The using method of the relay protection device for the power system comprises the following steps of:
S1, collecting current in the operation of the power system in real time through a sampling measurement module, when the current data belongs to a certain current parameter range in a parameter database, performing step S2, when the current data does not belong to any current parameter range in the parameter database, comparing the sizes of the current data, performing step S3,
S2, the sampling and measuring module transmits the current parameter value range to a selected logic module, the selected logic module selects an execution instruction corresponding to the current parameter value range from a logic instruction database and transmits the execution instruction to the command output module, and then the step S4 is performed;
S3, the sampling measurement module transmits the collected current data and the magnitude comparison result to the judgment logic module, the judgment logic module judges the fault type according to the logic program of the judgment logic module, then a new execution instruction is generated, the new execution instruction of the judgment logic module is transmitted to the command output module, and then the step S4 is carried out;
s4, the command output module transmits the execution command to the circuit breaker to enable the circuit breaker to perform corresponding actions;
The relay protection device is characterized in that data transmission is realized between the relay protection main body (1) and the circuit breaker through a double-line switching circuit, the command output module is further connected with an active quick-break module, the double-line switching circuit comprises a switching switch (3) arranged between the relay protection main body (1) and the circuit breaker, the data transmission is realized between the relay protection main body (1) and the switching switch (3) through a power line (2), the data transmission is realized between the switching switch (3) and the circuit breaker through one of a main power transmission line (4) or a self-break circuit (5), the self-break circuit (5) comprises a power transmission line (51) and a fuse (52) electrically connected to the power transmission line (51), and the switching switch (3) is in circuit communication with the main power transmission line (4) in an initial state;
the method further comprises the following steps after the step S4: when the breaker does not act according to the execution instruction within the set time, the active quick-break module is started to conduct secondary automatic breaking on the line, and the secondary automatic breaking process is specifically as follows: the active quick-break module is used for controlling the change-over switch (3) to switch the circuit so as to disconnect the connection between the active quick-break module and the main power transmission line (4) and realize the circuit communication with the self-break line (5), at the moment, the current of the power system operation is transmitted on the self-break line (5), and when the current overload exceeds the specified time, the fuse (52) is directly fused, so that the power supply to the circuit breaker is disconnected;
In the secondary autonomous disconnection process, the sampling measurement module keeps the action of collecting the running current of the power system in real time for comparison, and when the fuse (52) is not fused for more than the specified time and the current data collected at the moment is in a certain current parameter range, the active quick disconnection module controls the change-over switch (3) to conduct circuit switching again, disconnects the connection with the self-disconnection circuit (5) and recovers the circuit communication with the main power transmission circuit (4).
2. The relay protection device for an electrical power system of claim 1, wherein: in step S3, the judging logic module further transmits a new execution instruction and current data to the parameter setting module, and the parameter setting module supplements the current data to the parameter database and supplements the new execution instruction to the logic instruction database as an execution instruction corresponding to the current data.
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| CN202410810642.1A CN118399344B (en) | 2024-06-21 | 2024-06-21 | Relay protection device for power system |
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| CN202410810642.1A CN118399344B (en) | 2024-06-21 | 2024-06-21 | Relay protection device for power system |
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| CN118399344B true CN118399344B (en) | 2024-10-15 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064807A (en) * | 2009-11-12 | 2011-05-18 | 安电株式会社 | Switch circuit having overcurrent detection function |
| CN109839575A (en) * | 2019-04-04 | 2019-06-04 | 国家电网有限公司 | A kind of electric power system fault processing method, device and terminal device |
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| CN111668819B (en) * | 2020-06-22 | 2022-07-29 | 广东韶钢松山股份有限公司 | Line protection control method and microcomputer protection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064807A (en) * | 2009-11-12 | 2011-05-18 | 安电株式会社 | Switch circuit having overcurrent detection function |
| CN109839575A (en) * | 2019-04-04 | 2019-06-04 | 国家电网有限公司 | A kind of electric power system fault processing method, device and terminal device |
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