CN113140971A - Anti-vibration high tension switchgear circuit breaker anti-jumping system - Google Patents
Anti-vibration high tension switchgear circuit breaker anti-jumping system Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 claims description 4
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- 230000009191 jumping Effects 0.000 description 7
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
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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
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Abstract
The invention discloses an anti-jumping system for a circuit breaker of an anti-vibration high-voltage switch cabinet, which comprises a power supply, a switching-on device, a switching-off device, a circuit breaker and a microcomputer comprehensive protection device, wherein the switching-on device is connected with the switching-off device; a first opening end of the microcomputer comprehensive protection device is connected with a closing loop of the circuit breaker in series; when the first open-close end and the second open-close end of the microcomputer comprehensive protection device simultaneously detect high level, the microcomputer comprehensive protection device controls the first open-close end to be switched to a circuit breaking state; when at least one of the first open-close end and the second open-close end of the microcomputer integrated protection device detects low level, the microcomputer integrated protection device controls the first open-close end to be switched to a passage state. The programmable port of the microcomputer comprehensive protection device is utilized to reliably realize the anti-jump protection of the circuit breaker.
Description
Technical Field
The invention relates to the technical field of operation safety of power equipment, in particular to an anti-jumping system of a circuit breaker of an anti-vibration high-voltage switch cabinet.
Background
The circuit breaker is used in a control loop of the high-voltage switch cabinet to realize on-off control of a main loop, and when the circuit breaker is manually or automatically switched on a faulty line, the relay protection device trips. At this time, if the operator still puts the control switch at the closing position, or the contact of the automatic reclosing device is not reset, the circuit breaker will be closed again. Because the fault on the line is not eliminated, the protection device acts on tripping again, so that the phenomenon of multiple 'jumping-in' is called 'jumping'. Which may cause the breaking capability of the circuit breaker to be degraded or damaged and even cause an explosion accident.
In the existing control loop, a relay protection device mostly adopts an anti-jump relay, so that the anti-jump of the relay is realized. When the circuit breaker receives tripping and closing commands at the same time, the anti-tripping relay effectively prevents the circuit breaker from repeatedly closing and tripping to break a closing loop, and reliably places the circuit breaker at a tripping position.
However, the anti-tripping relay is usually an electromagnetic relay, if the high-voltage switch cabinet is installed near a vibration source, the operation of the high-voltage switch cabinet is affected by vibration, and contacts of the electromagnetic relay are easily conducted, so that the misoperation of the circuit breaker is caused, the power failure of equipment is caused, and the power supply is affected.
Disclosure of Invention
The embodiment of the invention aims to: the utility model provides an anti-shock high tension switchgear circuit breaker prevents system of jumping which can effectually prevent the mistake of electromagnetic type relay that vibrations were taken from switching on.
In order to achieve the purpose, the invention adopts the following technical scheme:
the anti-jumping system comprises a power supply, a switching-on device, a switching-off device, a circuit breaker and a microcomputer comprehensive protection device;
the first end of the switching-on device is connected with the power supply, and the second end of the switching-on device is connected with the first switching-on end of the microcomputer comprehensive protection device;
the first end of the opening device is connected with the power supply, and the second end of the opening device is respectively connected with the second switching-on end of the microcomputer comprehensive protection device and the opening loop of the circuit breaker in series;
a first opening end of the microcomputer comprehensive protection device is connected with a closing loop of the circuit breaker in series;
when the first open-close end and the second open-close end of the microcomputer integrated protection device simultaneously detect high levels, the microcomputer integrated protection device controls the first open-close end to be switched to a circuit breaking state;
when at least one of the first open-close end and the second open-close end of the microcomputer integrated protection device detects a low level, the microcomputer integrated protection device controls the first open-close end to be switched to a passage state.
Optionally, the first open end of the microcomputer integrated protection device is in a normally open state.
Optionally, the microcomputer comprehensive protection device is a programmable microcomputer comprehensive protection device, and the first open end of the microcomputer comprehensive protection device is a programmable port.
Optionally, the control equation setting value of the first open end of the microcomputer integrated protection device is as follows:
OUT107＝LT7
RST7＝(IN106*/IN101+IN101*/IN106+IN106*IN101)*LT7
SET7＝(！IN106*！IN101+！IN106*/IN101+！IN101*/IN106)*！LT7
wherein LT7 is a relay hold word corresponding to the first open end, RST7 is a 0 SET condition of LT7, SET7 is a 1 SET condition of LT7, IN106 is the first open end, IN101 is the second open end, "+" is a logical and, "/" is a rising edge of the signals input to the first open end and the second open end, "+" is a logical or, and "| is a logical or! "represents a logical not, OUT107 represents the first output;
when the first and second input terminals detect a high level at the same time, RST7 is 1, LT7 is set to 0, and the integrated protection device triggers the first input terminal to switch to an open circuit state;
when at least one of the first and second input terminals detects a low level, SET7 is 1, LT7 is SET to 1, and the integrated protection device triggers the first input terminal to switch to a pass state.
Optionally, when the microcomputer integrated protection device is in a power-off state, the first open end of the microcomputer integrated protection device is in a power-off state.
Optionally, the switching-on device includes control switch, manual switching-on circuit and remote control switching-on circuit, manual switching-on circuit includes switching-on switch and this cubical switchboard operation switch, remote control switching-on circuit does the second that computer integrated protection device is used for the remote control to close a floodgate opens the end, control switch closing switch with this cubical switchboard operation switch establishes ties in proper order, switching-on switch with the second is opened the end and is connected in parallel, control switch alternative intercommunication manual switching-on circuit or remote control switching-on circuit.
Optionally, a bus coupler switch is further connected in series between the closing device and the microcomputer comprehensive protection device, and the bus coupler switch is arranged in the bus coupler cabinet.
Optionally, the separating brake device includes manual separating brake circuit, remote control separating brake circuit and protection tripping circuit, manual separating brake circuit the remote control separating brake circuit with protection tripping circuit sets up in parallel, manual separating brake circuit includes the separating brake switch, the remote control separating brake circuit does computer integrated protection device is used for the third of remote control separating brake to open the end, protection tripping circuit does computer integrated protection device is used for protecting monitoring control's fourth output, fifth output and sixth output.
Optionally, the action time of the first opening end of the microcomputer integrated protection device is less than 1 ms.
Optionally, the type of the microcomputer comprehensive protection device is SEL-351A.
The invention has the beneficial effects that: the logic programming setting of the first output end OUT107 of the microcomputer comprehensive protection device replaces a conventional electromagnetic relay, so that the locking function of a closing circuit is realized, the jumping fault of the circuit breaker is avoided, the locking function of the electromagnetic relay is realized by programming a logic programmable port of the microcomputer comprehensive protection device, the programmable port of the microcomputer comprehensive protection device can be effectively utilized to replace the electromagnetic relay in the high-voltage switch cabinet, and the jumping prevention protection of the circuit breaker is reliably realized.
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The invention is explained in more detail below with reference to the figures and examples.
Fig. 1 is a circuit diagram of an anti-jump system of a circuit breaker of an anti-vibration high voltage switch cabinet according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an operation logic of a first open end of a microcomputer integrated protection device of the anti-vibration high-voltage switch cabinet circuit breaker anti-jump system according to the embodiment of the invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the embodiment of the invention, the main function of the switch gear (switchgear) is to open and close, control and protect electric equipment in the process of generating, transmitting, distributing and converting electric energy of a power system. The components in the switch cabinet mainly comprise a circuit breaker, an isolating switch, a load switch, an operating mechanism, a mutual inductor, various protection devices and the like. The classification methods of the switch cabinets are various, for example, the switch cabinets can be divided into movable switch cabinets and fixed switch cabinets by the installation mode of the circuit breaker; or according to different cabinet body structures, the cabinet body can be divided into an open type switch cabinet, a metal closed switch cabinet and a metal closed armored switch cabinet; the high-voltage switch cabinet, the medium-voltage switch cabinet, the low-voltage switch cabinet and the like can be divided according to different voltage grades. The method is mainly suitable for various occasions such as power plants, transformer substations, petrochemical industry, metallurgical steel rolling, light industrial textile, industrial and mining enterprises, residential districts, high-rise buildings and the like.
As shown in fig. 1 to 2, in the embodiment, the anti-jumping system of a circuit breaker of an anti-vibration high voltage switch cabinet according to the present invention may include a power supply, a switching device, a circuit breaker, and a microcomputer integrated protection device.
The power supply is used for supplying power to equipment in the high-voltage switch cabinet, and is usually a low-voltage direct-current power supply, or is selected according to the actual working condition of control equipment in the high-voltage switch cabinet, for example, low-voltage alternating current or direct current is used, or the low-voltage alternating current or direct current is input to specific equipment for use after being processed by a power supply circuit arranged inside the high-voltage switch cabinet.
The closing device is mainly used for controlling whether a closing loop HQ of the circuit breaker is connected with a power supply or not to form a loop so as to close a main loop, and the closing loop can be a manual control loop or a remote control loop.
The opening device is mainly used for controlling whether an opening loop TQ of the circuit breaker is connected or not and cutting off a main loop of the circuit breaker, and the opening device can also be a manual control loop, a remote control loop or an automatic control loop and works to separate main contacts of the circuit breaker when meeting preset conditions so as to cut off the main loop.
The microcomputer comprehensive protection device is also called microcomputer comprehensive protection device and microcomputer type protection device, and is an economical protection for integration of measurement, control, protection and communication; the high-voltage distribution room of the distribution network terminal is customized, three-section type non-directional current protection is taken as a core, and monitoring and acquisition functions of power grid parameters are provided, so that the traditional ammeter, voltmeter, power meter, frequency meter, kilowatt-hour meter and the like can be omitted, the measured data and the protection information can be remotely transmitted to an upper computer through a communication port, and distribution network automation can be conveniently realized; the device integrates the automatic switching function of the standby power supply in the device according to the characteristic of power supply of the distribution network, can flexibly realize the functions of inlet-line standby switching and mother-branch standby switching, provides partial logic programming outlet ports, and judges the working logic of the appointed outlet port according to the programming equation and the information acquired by the inlet port so as to realize the realization of specific functions.
IN the embodiment of the invention, the first end of the switching-on device is connected with a power supply, and the second end of the switching-on device is connected with a first switching-on end IN106 of the microcomputer comprehensive protection device; the first end of the opening device is connected with a power supply, and the second end of the opening device is respectively connected with a second opening and closing end IN101 of the microcomputer comprehensive protection device and an opening loop TQ of the circuit breaker; the first opening end OUT107 of the microcomputer integrated protection device is connected with a closing loop HQ of the circuit breaker.
In the embodiment of the present invention, the first output terminal OUT107 of the integrated protection device for a microcomputer is provided with the following operation logic: when the first input terminal IN106 and the second input terminal IN101 of the comprehensive protection device for microcomputer detect high level at the same time, the comprehensive protection device for microcomputer controls the first output terminal OUT107 to switch to the open circuit state; when at least one of the first input terminal IN106 and the second input terminal IN101 of the integrated protection device detects a low level, the integrated protection device controls the first output terminal OUT107 to switch to a pass state.
That is, when the first and second opening/closing terminals IN106 and IN101 of the integrated protection device are simultaneously turned on, the integrated protection device controls the first opening/closing terminal OUT107 connected to the closing circuit HQ of the circuit breaker to be turned off, so that the closing circuit HQ of the circuit breaker is IN a locked state, and does not respond to the turn-on operation of the circuit breaker after the turn-on of the closing device, thereby preventing the circuit breaker from jumping. When only the first switching-on end IN106 or the second switching-off end IN101 is switched on or neither is switched on, the microcomputer integrated protection device controls the first switching-off end OUT107 to be switched to a passage state, and at the moment, the possibility that the circuit breaker jumps does not exist, so that the first switching-off end OUT107 is controlled to be IN the passage state, the switching-on control and the switching-off control from the switching-on device and the switching-off device are normally responded, and the normal work of the switching-on device and the switching-off device is ensured.
In the embodiment of the invention, the logic programming setting of the first output end OUT107 of the microcomputer comprehensive protection device is adopted to replace a conventional electromagnetic relay, so that the locking function of a closing circuit is realized, the jumping fault of the circuit breaker is avoided, the locking function of the electromagnetic relay is realized by programming the logic programming port of the microcomputer comprehensive protection device, the programmable port of the microcomputer comprehensive protection device can be effectively utilized to replace the electromagnetic relay in the high-voltage switch cabinet, and the jumping prevention protection of the circuit breaker is reliably realized.
In the embodiment of the invention, the first open end OUT107 of the microcomputer integrated protection device is in a normally open state. That is, the first open terminal OUT107 of the microcomputer integrated protection device is normally in a normally open state, and when it is required to change to a pass state, it is necessary to keep outputting a control signal to the first open terminal OUT107 so that the first open terminal OUT107 operates in the pass state.
Further, when the microcomputer integrated protection device is in the power-off state, the first output terminal OUT107 of the microcomputer integrated protection device is in the power-off state. That is, in the embodiment of the present invention, the path of the first output terminal OUT107 of the integrated protection device for a microcomputer needs to be maintained in a power-on state, and after the power is lost, the path is automatically set as an open state. When the power supply of the microcomputer comprehensive protection device is lost, the first output end OUT107 of the microcomputer comprehensive protection device loses the driving force and is converted into an open circuit state, so that the situation that the port OUT107 of the first output end of the microcomputer comprehensive protection device is in a closed circuit state when the microcomputer comprehensive protection device is lost is avoided, the high-voltage switch cabinet is possible to jump, and the working safety of the high-voltage switch cabinet is further improved.
In the embodiment of the invention, the microcomputer comprehensive protection device is a programmable microcomputer comprehensive protection device, and the first output end OUT107 of the microcomputer comprehensive protection device is a programmable port.
In a specific example, the control equation setting value of the first output terminal OUT107 of the microcomputer integrated protection device is as follows:
OUT107＝LT7
RST7＝(IN106*/IN101+IN101*/IN106+IN106*IN101)*LT7
SET7＝(！IN106*！IN101+！IN106*/IN101+！IN101*/IN106)*！LT7
wherein LT7 is a relay holding word of the integrated protection device for a microcomputer corresponding to the first open terminal OUT107, RST7 represents a 0 SET condition of LT7, SET7 represents a 1 SET condition of LT7, IN106 represents a first open terminal IN106, IN101 represents a second open terminal IN101, ""/"represents a logical and," + "represents a logical or, and" | represents a logical or! "denotes a logical not, OUT107 denotes a first open terminal OUT 107;
when the first input terminal IN106 and the second input terminal IN101 detect the high level at the same time, RST7 is equal to 1, LT7 is set to 0, and the integrated protection device triggers the microcomputer to control the first output terminal OUT107 to switch to the open state;
when at least one of the first and second input terminals IN106 and IN101 detects a low level, the SET7 is equal to 1, the LT7 is SET to 1, and the integrated protection device triggers the microcomputer to control the first output terminal OUT107 to switch to the on state.
IN this example, the high level detected by the first and second switching terminals IN106 and IN101 may be a rising edge of a high level signal generated when the switching-on and switching-off devices are turned on (a change instant when the signal changes from a low level to a high level), or a high level signal continuously output when the switching-on and switching-off devices are continuously turned on. IN other words, IN this example, the fact that the first and second switching terminals IN106 and IN101 simultaneously detect the high level means that the first and second switching terminals IN106 and IN101 simultaneously operate IN the high level mode, and the case that the switching-on device or the switching-off device operates IN the on state and the other switching-off device or the switching-on device is instantaneously switched on is also included.
In one example, a bus coupler switch is further arranged between the closing device and the microcomputer comprehensive protection device in series, and the bus coupler switch is arranged in the bus coupler cabinet.
The bus coupler switch is arranged between the closing device and the microcomputer comprehensive protection device in series, so that interconnection with the working state of the bus coupler equipment can be realized, and the work of the circuit breaker is controlled according to the working state of the bus coupler equipment.
In an example of the present invention, the switching-on device may include a control switch 1QK, a manual switching-on circuit and a remote control switching-on circuit, the manual switching-on circuit includes a switching-on switch 1KK and an operation switch YW of the switch cabinet, the remote control switching-on circuit is a second switch-off terminal OUT105 of the microcomputer integrated protection device for remote control switching-on, the control switch 1QK, the switching-on switch 1KK and the operation switch YW of the switch cabinet are sequentially connected in series, the switching-on switch 1KK is connected in parallel with the second switch-off terminal, and the control switch 1QK may selectively communicate with the manual switching-on circuit or the remote control switching-on circuit.
The switching-off device can comprise a manual switching-off circuit, a remote control switching-off circuit and a protection tripping circuit, the manual switching-off circuit, the remote control switching-off circuit and the protection tripping circuit are arranged in parallel, the manual switching-off circuit comprises a switching-off switch 2KK, the remote control switching-off circuit is a third output end OUT106 used for remotely controlling switching-off of the microcomputer comprehensive protection device, and the protection tripping circuit is a fourth output end OUT101, a fifth output end OUT102 and a sixth output end OUT103 used for protecting monitoring and controlling of the microcomputer comprehensive protection device.
The operation time of the first output terminal OUT107 of the microcomputer integrated protection device is less than 60ms, and preferably the operation time of the first output terminal OUT107 is less than 1 ms.
In one specific example, the model number of the microcomputer integrated protection device is SEL-351A.
In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. An anti-jumping system of an anti-vibration high-voltage switch cabinet breaker is characterized by comprising a power supply, a closing device, a separating device, a breaker and a microcomputer comprehensive protection device;
the first end of the switching-on device is connected with the power supply, and the second end of the switching-on device is connected with the first switching-on end of the microcomputer comprehensive protection device;
the first end of the opening device is connected with the power supply, and the second end of the opening device is respectively connected with the second switching-on end of the microcomputer comprehensive protection device and the opening loop of the circuit breaker in series;
a first opening end of the microcomputer comprehensive protection device is connected with a closing loop of the circuit breaker in series;
when the first open-close end and the second open-close end of the microcomputer integrated protection device simultaneously detect high levels, the microcomputer integrated protection device controls the first open-close end to be switched to a circuit breaking state;
when at least one of the first open-close end and the second open-close end of the microcomputer integrated protection device detects a low level, the microcomputer integrated protection device controls the first open-close end to be switched to a passage state.
2. The anti-bounce system of an anti-shock high voltage switchgear circuit breaker according to claim 1, wherein said first open end of said microcomputer integrated protection device is normally open.
3. The anti-bounce system of an anti-shock high voltage switchgear circuit breaker according to claim 1, wherein said microcomputer integrated protection device is a programmable microcomputer integrated protection device, said first open end of said microcomputer integrated protection device being a programmable port.
4. The anti-bounce system of an anti-shock high voltage switchgear circuit breaker according to claim 1, wherein the control equation setting values of the first open end of the microcomputer integrated protection device are:
OUT107＝LT7
RST7＝(IN106*/IN101+IN101*/IN106+IN106*IN101)*LT7
SET7＝(！IN106*！IN101+！IN106*/IN101+！IN101*/IN106)*！LT7
wherein LT7 is a relay hold word corresponding to the first open end, RST7 is a 0 SET condition of LT7, SET7 is a 1 SET condition of LT7, IN106 is the first open end, IN101 is the second open end, "+" is a logical and, "/" is a rising edge of the signals input to the first open end and the second open end, "+" is a logical or, and "| is a logical or! "represents a logical not, OUT107 represents the first output;
when the first and second input terminals detect a high level at the same time, RST7 is 1, LT7 is set to 0, and the integrated protection device triggers the first input terminal to switch to an open circuit state;
when at least one of the first and second input terminals detects a low level, SET7 is 1, LT7 is SET to 1, and the integrated protection device triggers the first input terminal to switch to a pass state.
5. The anti-bounce system of an anti-shock high voltage switchgear circuit breaker of claim 1, wherein said first open end of said microcomputer integrated protection device is in a tripped state when said microcomputer integrated protection device is in a tripped state.
6. The anti-shock high-voltage switch cabinet breaker anti-tripping system according to claim 1, wherein the switching-on device comprises a control switch, a manual switching-on circuit and a remote control switching-on circuit, the manual switching-on circuit comprises a switching-on switch and a switch cabinet operating switch, the remote control switching-on circuit is a second switch-off end of the microcomputer integrated protection device for remote control switching-on, the control switch, the switching-on switch and the switch cabinet operating switch are sequentially connected in series, the switching-on switch is connected in parallel with the second switch-off end, and the control switch can be selectively communicated with the manual switching-on circuit or the remote control switching-on circuit.
7. The anti-jumping system of the anti-vibration high voltage switch cabinet breaker as claimed in claim 1, wherein a bus coupler switch is further disposed in series between the switching-on device and the microcomputer integrated protection device, and the bus coupler switch is disposed in the bus coupler cabinet.
8. The anti-jumping system of the anti-vibration high voltage switch cabinet breaker as claimed in claim 1, wherein the switching-off device comprises a manual switching-off circuit, a remote control switching-off circuit and a protection tripping circuit, the manual switching-off circuit, the remote control switching-off circuit and the protection tripping circuit are arranged in parallel, the manual switching-off circuit comprises a switching-off switch, the remote control switching-off circuit is a third switching-off end of the microcomputer integrated protection device for remote control switching-off, and the protection tripping circuit is a fourth switching-off end, a fifth switching-off end and a sixth switching-off end of the microcomputer integrated protection device for protection monitoring control.
9. The anti-bounce system of an anti-shock high voltage switchgear circuit breaker according to claim 1, wherein an actuation time of said first open terminal of said microcomputer based integrated protection device is less than 1 ms.
10. The anti-bounce system of an anti-shock high voltage switchgear circuit breaker of claim 1, wherein said microcomputer integrated protection device is model number SEL-351A.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114356049A (en) * | 2021-12-29 | 2022-04-15 | 万洲电气股份有限公司 | Multifunctional microcomputer comprehensive protection device for preventing split software from jumping |
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