CN211478604U - Device for simulating ground fault of direct current system - Google Patents
Device for simulating ground fault of direct current system Download PDFInfo
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- CN211478604U CN211478604U CN201922115044.XU CN201922115044U CN211478604U CN 211478604 U CN211478604 U CN 211478604U CN 201922115044 U CN201922115044 U CN 201922115044U CN 211478604 U CN211478604 U CN 211478604U
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Abstract
The utility model discloses a device for simulating the ground fault of a direct current system, which comprises a microcontroller module, a power circuit module, a simulated ground fault module, an electronic switch circuit module and a first resistor; the analog ground fault module outputs a control signal in a preset period, controls the microcontroller module to output a corresponding level, and drives the switch tube to be closed through the triode amplifying current, so that a direct current system ground fault loop is simulated, and a power technician can trainedly troubleshoot a ground fault simulated by the device for simulating the direct current system ground fault, so that the troubleshooting skill of the technician is improved, the power system accident analysis is facilitated, and the true cause of the power system accident is found; therefore, corresponding measures can be taken according to accident reasons, and the electric power accidents of the electric power system with unknown reasons can be reduced. The utility model discloses can be applied to direct current system technical field.
Description
Technical Field
The utility model belongs to the technical field of direct current system and specifically relates to a simulation direct current system ground fault's device.
Background
The direct current system is used as a power source of secondary equipment of the power system, and the requirement on safety and reliability is very high. The direct current system is an ungrounded power supply system, and the ground fault of the direct current system can cause relay protection misoperation or operation failure accidents, thereby seriously influencing the power production work. The current power generation department requires to search for direct current power supply grounding, generally to investigate and analyze direct current permanent grounding faults, and has no concern about instantaneous grounding faults, because the instantaneous grounding is unreliable and cannot give reaction time to analysts. But the protection action time is 3-5ms, so that an instantaneous grounding of more than 3ms is equally harmful to the power system as a permanent grounding. Because most of the existing electric power accidents are permanent ground faults, the electric power accidents caused by instantaneous ground faults cannot be effectively checked, so that the electric power accidents caused by unknown reasons of the electric power system exist for many years; at present, no device capable of simulating transient ground faults, unreliable ground faults and permanent ground faults is available to help us to analyze the power system accidents.
Disclosure of Invention
In order to solve at least one of the above technical problems, an object of the present invention is to provide a device for simulating a ground fault of a dc system.
The utility model adopts the technical proposal that: the utility model comprises a device for simulating the ground fault of a direct current system, which comprises a microcontroller module, a power circuit module, a simulation ground fault module, an electronic switch circuit module and a first resistor;
the microcontroller module, the analog ground fault module and the electronic switch circuit module are respectively connected with the power circuit module; the analog ground fault module is connected with the input end of the microcontroller module; a first port of the electronic switch circuit module is connected with the output end of the microcontroller module, and a second port of the electronic switch circuit module is connected with one end of the first resistor;
the analog ground fault module is used for outputting a control signal in a preset period, the microcontroller module receives the control signal through an input end, the microcontroller module outputs a corresponding level through an output end according to the control signal, and the electronic switch circuit module inputs the corresponding level through a first port.
Further, the electronic switch circuit module comprises an electronic switch driving circuit and a switch tube; the electronic switch driving circuit is composed of a triode and an optocoupler, the input end of the electronic switch driving circuit is connected with the output end of the microcontroller module as the first port of the electronic switch circuit module, the output end of the electronic switch driving circuit is connected with one end of the switch tube, and the other end of the switch tube is connected with one end of the first resistor as the second port of the electronic switch circuit module.
Furthermore, after the electronic switch driving circuit inputs the corresponding level through the input end, the triode is conducted and amplifies current, and the current is output to the light opening tube through the output end of the electronic switch driving circuit and drives the switch tube to be closed.
Furthermore, the electronic switch circuit module is also provided with a third port, and the electronic switch circuit module is connected with a positive bus of an external direct current system through the third port; the other end of the first resistor is externally connected with the ground.
Further, the electronic switch circuit module is externally connected with the ground through the third port; the other end of the first resistor is connected with a negative bus of an external direct current system.
Further, the power circuit module is used for providing power for the microcontroller module, the analog ground fault module and the electronic switch circuit module, and comprises a voltage conversion circuit; the output end of the voltage conversion circuit is connected with the power receiving end of the microcontroller, and the output end of the voltage conversion circuit is also connected with the power receiving end of the analog ground fault.
Further, the ground fault simulation module comprises a touch screen, and the touch screen is used for displaying a human-computer interaction interface.
Furthermore, the ground fault simulation module further comprises a computer terminal and/or a mobile phone terminal, and the computer terminal and/or the mobile phone terminal are used for displaying a human-computer interaction interface.
The utility model has the advantages that: the utility model discloses a control signal is exported with preset cycle to simulation ground fault module, control microcontroller module output corresponding level, and rethread triode amplification current drive switch tube is closed to simulation direct current system ground fault return circuit, the power tech personnel can train the ground fault of investigation simulation through the device of simulation direct current system ground fault, thereby improve technical personnel's troubleshooting skill, help electric power system accident analysis, find the true reason of electric power system accident; therefore, corresponding measures can be taken according to accident reasons, and the electric power accidents of the electric power system with unknown reasons can be reduced.
Drawings
Fig. 1 is a block diagram of the ground fault simulation device of the present invention;
fig. 2 is a circuit diagram of the electronic switch circuit module according to the present invention;
fig. 3 is a circuit diagram of an electronic switching circuit module according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a power circuit module according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, an apparatus for simulating a ground fault of a dc system includes a microcontroller module, a power circuit module, a simulated ground fault module, an electronic switch circuit module, and a first resistor;
the microcontroller module, the analog ground fault module and the electronic switch circuit module are respectively connected with the power circuit module; the analog ground fault module is connected with the input end of the microcontroller module; a first port of the electronic switch circuit module is connected with the output end of the microcontroller module, and a second port of the electronic switch circuit module is connected with one end of the first resistor;
the analog ground fault module is used for outputting a control signal in a preset period, the microcontroller module receives the control signal through an input end, the microcontroller module outputs a corresponding level through an output end according to the control signal, and the electronic switch circuit module inputs the corresponding level through a first port.
Referring to fig. 2, the electronic switch circuit module includes an electronic switch driving circuit and a switching tube; the electronic switch driving circuit is composed of a triode and an optocoupler, the input end of the electronic switch driving circuit is connected with the output end of the microcontroller module as the first port of the electronic switch circuit module, the output end of the electronic switch driving circuit is connected with one end of the switch tube, and the other end of the switch tube is connected with one end of the first resistor as the second port of the electronic switch circuit module.
In the embodiment, the microcontroller module selects an STM32F103T4 model chip as a control single chip microcomputer, and is characterized in that the highest running frequency of the chip can reach 72MHz (high-speed CPU), the chip only has 36 branch pins, the number of resources is small, and the chip is a high-speed small CPU; the basic requirements of single design function and high-speed operation of a scheme product can be met, and the cost can be effectively controlled by selecting a small CPU.
In this embodiment, a main switching device in the electronic switching circuit module is designed by using the FGA25N120AN switching tube, and referring to fig. 3, pin 1 is an input, that is, pin 1 is connected to an output terminal of the microprocessor module, and is a first port of the electronic switching circuit module, pin 2 is an output, that is, pin 2 is connected to a first resistor, and is a second port of the electronic switching circuit module; in addition, in order to reduce the burden of an output and input port (I/O port) of the CPU, a low-power triode is selected to drive an optocoupler, and the optocoupler drives a switch tube of a main loop.
As a further preferred embodiment, after the electronic switch driving circuit inputs the corresponding level through the input terminal, the triode is turned on and amplifies the current, and the current is output to the light-switching tube through the output terminal of the electronic switch driving circuit and drives the light-switching tube to be closed;
the electronic switch circuit module is also provided with a third port, and the electronic switch circuit module is connected with a positive bus of an external direct current system through the third port; the other end of the first resistor is externally connected with the ground;
the electronic switch circuit module is externally connected with the ground through the third port; the other end of the first resistor is connected with a negative bus of an external direct current system.
In this embodiment, the analog ground fault module outputs a control signal according to a preset period, and the control single chip microcomputer outputs a corresponding high level or low level after receiving the signal, when the control single chip microcomputer outputs the high level, a triode in the electronic switch circuit module is turned on and amplifies current, so as to drive a switch tube to be closed and turn on a fault loop, and at this time, if a third port of the electronic switch circuit module is set to be connected with a positive bus of an external direct current system; the other end of the first resistor is externally connected with the ground, so that the positive pole ground fault of the direct current system can be simulated; if the third port of the electronic switch circuit module is externally connected with the ground; and the other end of the first resistor is connected with a negative bus of an external direct current system, so that the negative ground fault of the direct current system can be simulated.
As a further preferred embodiment, the power circuit module is configured to provide power to the microcontroller module, the analog ground fault module, and the electronic switch circuit module, and the power circuit module includes a voltage conversion circuit; the output end of the voltage conversion circuit is connected with the power receiving end of the microcontroller, and the output end of the voltage conversion circuit is also connected with the power receiving end of the analog ground fault;
the simulated ground fault module comprises a touch screen, and the touch screen is used for displaying a human-computer interaction interface;
the simulated ground fault module further comprises a computer terminal and/or a mobile phone terminal, and the computer terminal and/or the mobile phone terminal are used for displaying a human-computer interaction interface.
In this embodiment, referring to fig. 4, the power circuit module utilizes an LM2576(HV) -3.3 voltage stabilizing chip to design a voltage stabilizing power circuit, and the power circuit outputs a reliable 3.3V power; the 12V battery output power supply is used as a power supply of the voltage stabilizing chip and the electronic switch circuit module, and the 3.3V power supply is used as a power supply of the microcontroller module and a working power supply of the analog ground fault module.
In this embodiment, the simulated ground fault module selects a 4.3-inch touch screen of a punctual atom to display a human-computer interaction interface, and a user can design a simulated ground fault through the interface. The touch screen can complete different types of ground faults by designing the working time period and frequency parameters of the electronic switch circuit module; the parameters comprise ground fault time and fault recovery time, the set time of each parameter can be time, minutes, seconds and milliseconds, and the set value range is 0-999. According to the set time parameters, the occurrence of instantaneous ground faults, unreliable ground faults and permanent ground faults can be simulated; the analog ground fault module can output a control signal to the microcontroller module at a preset period, the preset period is determined by the set ground fault time and the set fault recovery time, and the ground fault time and the set fault recovery time of the analog ground fault module determine the working time period of the electronic switch circuit module and output the control signal to the microcontroller module. The ground fault may be further set to a positive ground fault and a negative ground fault.
In this embodiment, the parameters can be set by simulating the type of the ground fault according to the requirement, and different parameters can be set, which can correspond to different ground faults, specifically as follows:
the instantaneous earth fault only needs to set the earth fault time value to be 0 hour, 0 minute and less than 180 seconds, and the millisecond is set randomly; in order to open each fault occurrence interval and consider by combining the working efficiency of the test, the millisecond parameter can be set at will, but in order to give the response time to the working personnel, the total time of the earth fault is recommended to be set to be more than 1 minute, and the numerical value of the fault recovery time is not required to be set;
the unreliable grounding fault needs to set grounding fault time, and the grounding fault time is more than 3 minutes; meanwhile, the fault recovery time needs to be set, and the fault recovery time is more than 1 minute;
the permanent earth fault needs to set the earth fault time to 999 minutes 999 seconds 999 milliseconds 999 hours 999 minutes 999, and needs to set the fault recovery time to 0 hours 0 minutes 0 seconds 0 milliseconds 0.
The microcontroller module (CPU) can control the output level of the output input port (I/O port) of the CPU to output high and low levels according to the set ground fault time and the fault recovery time, the output level of the output input port (I/O port) of the CPU is output high level in the ground fault time, and the output level of the output input port (I/O port) of the CPU is output low level in the fault recovery time. When the output input port (I/O port) of the CPU outputs high level, the triode in the electronic switch circuit module can be controlled to be conducted, and at the moment, if the third port of the electronic switch circuit module is connected with the positive bus of the external direct current system; the other end of the first resistor is externally connected with the ground, so that the positive pole ground fault of the direct current system can be simulated; if the third port of the electronic switch circuit module is externally connected with the ground; the other end of the first resistor is connected with a negative bus of an external direct current system, so that the negative ground fault of the direct current system can be simulated; when the output and input port (I/O port) of the CPU outputs low level, the triode in the electronic switch circuit module can be controlled to be cut off, the circuit is not conducted, and the grounding fault disappears.
For example, the touch screen is provided with the ground fault time value of 0 hour, 0 minute, 150 seconds and 0 milliseconds, because the touch screen is connected with a microcontroller module (CPU), within the ground fault time of 0 hour, 0 minute, 150 seconds and 0 milliseconds, an output input port (I/O port) of the CPU outputs a high level to control the conduction of a triode in the electronic switch circuit module, and at this time, if a third port of the electronic switch circuit module is connected with an anode bus of an external direct current system; the other end of the first resistor is externally connected with the ground, so that the instantaneous earth fault of the anode of the direct current system can be simulated; if the third port of the electronic switch circuit module is externally connected with the ground; and the other end of the first resistor is connected with a negative bus of an external direct current system, so that the instantaneous ground fault of the negative electrode of the direct current system can be simulated.
Similarly, if the set ground fault time in the touch screen is 0 hour, 3 minutes, 150 seconds and 0 millisecond, and the set recovery fault time is 0 hour, 1 minute, 150 seconds and 0 millisecond, because the touch screen is connected with a microcontroller module (CPU), in the ground fault time of 0 hour, 3 minutes, 150 seconds and 0 millisecond, an output/input port (I/O port) of the CPU outputs high level to control the conduction of a triode in the electronic switch circuit module, at the moment, if a third port of the electronic switch circuit module is connected with an anode bus of an external direct current system; the other end of the first resistor is externally connected with the ground, so that the fault that the anode of the direct current system cannot be connected with the ground can be simulated; if the third port of the electronic switch circuit module is externally connected with the ground; the other end of the first resistor is connected with a negative bus of an external direct current system, so that the fault that the negative pole of the direct current system cannot be grounded can be simulated; when the recovery fault time is 0, 1 minute, 150 seconds and 0 millisecond, the output and input port (I/O port) of the CPU outputs low level, the triode in the electronic switch circuit module is controlled to be cut off, the circuit is not conducted, and the non-reliable grounding fault disappears.
Similarly, if the set ground fault time in the touch screen is 999 hours, 999 minutes, 999 seconds and 999 milliseconds, and the set recovery fault time is 0 hours, 0 minutes, 0 seconds and 0 milliseconds, because the touch screen is connected with the microcontroller module (CPU), the CPU output/input port (I/O port) outputs high level within the ground fault time of 999 minutes, 999 seconds and 999 milliseconds, and controls the conduction of the triode in the electronic switch circuit module, at this time, if the third port of the electronic switch circuit module is connected with the positive bus of the external direct current system; the other end of the first resistor is externally connected with the ground, so that the permanent grounding fault of the anode of the direct current system can be simulated; if the third port of the electronic switch circuit module is externally connected with the ground; the other end of the first resistor is connected with a negative bus of an external direct current system, so that the permanent ground fault of the negative electrode of the direct current system can be simulated; because the recovery fault time is 0 hour, 0 minute, 0 second and 0 millisecond, the output and input port (I/O port) of the CPU does not output low level, that is, the triode in the electronic switch circuit module is continuously turned on and not turned off, and then the ground fault does not disappear, so the fault is a permanent ground fault.
To sum up, the utility model has the technical effects that:
the utility model designs the grounding fault time and the recovery time by adopting the touch screen, so that the micro controller module (CPU) controls the triode in the electronic switch circuit module to be switched on or switched off, thereby simulating the occurrence or disappearance of grounding faults of different types of direct current systems; the power technicians can train and investigate the ground fault simulated by the device for simulating the ground fault of the direct-current system, so that the troubleshooting skill of the technicians is improved, the accident analysis of the power system is facilitated, and the true reason of the accident of the power system is found; therefore, corresponding measures can be taken according to accident reasons, and the electric power accidents of the electric power system with unknown reasons can be reduced.
It should be noted that as used in this disclosure, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In addition, unless defined otherwise, all technical and scientific terms used in this example have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description of the embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this embodiment, the term "and/or" includes any combination of one or more of the associated listed items.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element of the same type from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. The use of any and all examples, or exemplary language ("e.g.," such as "or the like") provided with this embodiment is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (8)
1. A device for simulating the ground fault of a direct current system is characterized by comprising a microcontroller module, a power circuit module, a ground fault simulation module, an electronic switch circuit module and a first resistor;
the microcontroller module, the analog ground fault module and the electronic switch circuit module are respectively connected with the power circuit module; the analog ground fault module is connected with the input end of the microcontroller module; a first port of the electronic switch circuit module is connected with the output end of the microcontroller module, and a second port of the electronic switch circuit module is connected with one end of the first resistor;
the analog ground fault module is used for outputting a control signal in a preset period, the microcontroller module receives the control signal through an input end, the microcontroller module outputs a corresponding level through an output end according to the control signal, and the electronic switch circuit module inputs the corresponding level through a first port.
2. The apparatus of claim 1, wherein the electronic switch circuit module comprises an electronic switch driving circuit and a switch tube; the electronic switch driving circuit is composed of a triode and an optocoupler, the input end of the electronic switch driving circuit is connected with the output end of the microcontroller module as the first port of the electronic switch circuit module, the output end of the electronic switch driving circuit is connected with one end of the switch tube, and the other end of the switch tube is connected with one end of the first resistor as the second port of the electronic switch circuit module.
3. The apparatus according to claim 2, wherein after the electronic switch driving circuit inputs the corresponding level through the input terminal, the transistor conducts and amplifies a current, and the current is output to the switching tube through the output terminal of the electronic switch driving circuit and drives the switching tube to close.
4. The device for simulating the ground fault of the direct current system according to claim 1, wherein the electronic switch circuit module is further provided with a third port, and the electronic switch circuit module is connected with a positive bus of an external direct current system through the third port; the other end of the first resistor is externally connected with the ground.
5. The apparatus of claim 4, wherein the electronic switching circuit module is externally connected to ground through the third port; the other end of the first resistor is connected with a negative bus of an external direct current system.
6. The apparatus of claim 1, wherein the power circuit module is configured to provide power to the microcontroller module, the analog ground fault module, and the electronic switching circuit module, and the power circuit module comprises a voltage conversion circuit; the output end of the voltage conversion circuit is connected with the power receiving end of the microcontroller, and the output end of the voltage conversion circuit is also connected with the power receiving end of the analog ground fault.
7. The apparatus according to claim 1, wherein the ground fault simulation module comprises a touch screen for displaying a human-computer interaction interface.
8. The apparatus according to claim 1, wherein the ground fault simulation module further comprises a computer terminal and/or a mobile phone terminal, and the computer terminal and/or the mobile phone terminal is used for displaying a human-computer interaction interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922115044.XU CN211478604U (en) | 2019-11-29 | 2019-11-29 | Device for simulating ground fault of direct current system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922115044.XU CN211478604U (en) | 2019-11-29 | 2019-11-29 | Device for simulating ground fault of direct current system |
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| Publication Number | Publication Date |
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| CN211478604U true CN211478604U (en) | 2020-09-11 |
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| CN201922115044.XU Active CN211478604U (en) | 2019-11-29 | 2019-11-29 | Device for simulating ground fault of direct current system |
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