阅读说明：本技术 一种防雷设备智能接地电阻监测仪 (Intelligent grounding resistance monitor of lightning protection equipment ) 是由 俞奕 邓纬 王之鸿 路秋妮 吴建亮 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种防雷设备智能接地电阻监测仪,包括外壳,所述外壳内部固定安装有电路板,所述电路板内部设有按键输入电路,所述按键输入电路输出端电性连接有单片机处理器,所述单片机处理器的输出端电性连接有激励电压电路,所述激励电压电路的输出端电性连接有电压偏移电路,所述电压偏移电路的输出端电性连接有功率放大电路,所述功率放大电路的输出端电性连接有电压钳口电路,所述电压钳口电路的输出端电性连接有多路开关电路,所述分压积分电路的输出端电性连接有多路开关电路,所述多路开关电路的输出端电性连接有程控有源滤波电路,所述程控有源滤波电路的输出端电性连接有模数转换电路。(The invention discloses an intelligent grounding resistance monitor of lightning protection equipment, which comprises a shell, wherein a circuit board is fixedly arranged in the shell, the circuit board is internally provided with a key input circuit, the output end of the key input circuit is electrically connected with a singlechip processor, the output end of the singlechip processor is electrically connected with an excitation voltage circuit, the output end of the excitation voltage circuit is electrically connected with a voltage offset circuit, the output end of the voltage offset circuit is electrically connected with a power amplifying circuit, the output end of the power amplifying circuit is electrically connected with a voltage clamp circuit, the output end of the voltage clamp circuit is electrically connected with a multi-way switch circuit, the output end of the voltage division integrating circuit is electrically connected with a multi-way switch circuit, the output end of the multi-way switch circuit is electrically connected with a program-controlled active filter circuit, and the output end of the program-controlled active filter circuit is electrically connected with an analog-to-digital conversion circuit.)

1. The utility model provides a lightning protection equipment intelligence ground resistance monitor, includes shell (1), the inside fixed mounting of shell (1) has circuit board (2), its characterized in that: a key input circuit (21) is arranged in the circuit board (2), the output end of the key input circuit (21) is electrically connected with a single chip processor (10), the output end of the single chip processor (10) is electrically connected with an excitation voltage circuit (11), the output end of the excitation voltage circuit (11) is electrically connected with a voltage deviation circuit (12), the output end of the voltage deviation circuit (12) is electrically connected with a power amplification circuit (13), the output end of the power amplification circuit (13) is electrically connected with a voltage jaw circuit (14), the output end of the voltage jaw circuit (14) is electrically connected with a multi-way switch circuit (15), the output end of the voltage division integration circuit (16) is electrically connected with a multi-way switch circuit (15), and the output end of the multi-way switch circuit (15) is electrically connected with a program-controlled active filter circuit (18), the output end of the program control active filter circuit (18) is electrically connected with an analog-to-digital conversion circuit (17), and the output end of the analog-to-digital conversion circuit (17) is electrically connected with the single chip processor (10).

2. The intelligent ground resistance monitor of lightning protection equipment of claim 1, wherein: one end of the shell (1) is fixedly provided with a digital display (3), and the digital display (3) is electrically connected with the single chip microcomputer processor (10).

3. The intelligent ground resistance monitor of lightning protection equipment of claim 1, wherein: one end of the shell (1) is located on one side of the digital display (3) and is fixedly provided with a status indicator lamp (5), and the status indicator lamp (5) is electrically connected with the single chip microcomputer processor (10).

4. The intelligent ground resistance monitor of lightning protection equipment of claim 1, wherein: one end of the shell (1) is located below the digital display (3) and is fixedly provided with a setting button (4), and the setting button (4) is electrically connected with the key input circuit (21).

5. The intelligent ground resistance monitor of lightning protection equipment of claim 1, wherein: and a voltage measuring terminal (7) is fixedly arranged at a position close to the lower end part of one side of the shell (1), and the voltage measuring terminal (7) is electrically connected with the voltage clamp circuit (14).

6. The intelligent ground resistance monitor of lightning protection equipment of claim 5, wherein: voltage measurement terminal (7) one side fixed mounting has current measurement terminal (8), current measurement terminal (8) with current keeps silent circuit (20) electric connection, current keep silent circuit (20) with preamplification circuit (19) electric connection, preamplification circuit (19) with multi-way switch circuit (15) electric connection.

7. The intelligent ground resistance monitor of lightning protection equipment of claim 1, wherein: the shell (1) one side just is close to the position fixed mounting of upper end portion has remote communication terminal (9), remote communication terminal (9) with communication interface circuit (22) electric connection, communication interface circuit (22) with the output electric connection of singlechip treater (10).

8. The intelligent ground resistance monitor of lightning protection equipment of claim 1, wherein: an external direct current power supply terminal (6) is fixedly arranged at one side of the shell (1) and close to the upper end part.

9. The intelligent ground resistance monitor of lightning protection equipment of claim 8, wherein: external direct current power supply terminal (6) with circuit board (2), digital display (3) set up button (4) status indicator lamp (5) voltage measurement terminal (7) current measurement terminal (8) and the equal electric connection of remote communication terminal (9).

Technical Field

The invention relates to the field of electric power, in particular to an intelligent grounding resistance monitor of lightning protection equipment.

Background

Lightning protection grounding is usually set in an electric power system, is a means for maintaining reliable operation of various electric power equipment, and is also an important measure for ensuring personnel safety. If the grounding system is not well done, the system power utilization safety is influenced, the personal safety is threatened, and the great loss is caused. To verify the reliability of the grounding system, ground resistance detection is often introduced and enhanced. With the grounding system in use, the durability of the grounding device is also a challenge. The grounding device is different in grounding resistance value according to the specification, and the grounding device is required to be regularly detected according to the specification, and if the grounding resistance value exceeds the specified grounding resistance value in each system, the grounding device is required to be timely rectified and maintained so as to ensure the normal operation of the system and reduce the probability of personal damage and equipment damage.

The principle of lightning protection of the power supply mainly comprises the steps that lightning current is introduced into the ground to discharge rapidly, the induced voltage on a power supply circuit subjected to lightning impact is reduced, the discharge effect is influenced if the grounding resistance is increased, the grounding grid and electrodes of the lightning protection equipment can change in different degrees due to corrosion, the grounding resistance value is increased, and the lightning protection discharge effect is seriously influenced if managers cannot find abnormality and process the abnormality in time; however, the testing frequency range of the lightning grounding is low, and the grounding device is generally arranged outdoors, which brings trouble to the measurement of the grounding resistance; in order to solve the problem, the intelligent ground resistance tester is designed to perfectly realize remote measurement and control, so that the safety of the lightning grounding power grid can be effectively known in real time, the safety of equipment and personnel can be guaranteed, and a safety early warning effect can be realized.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the intelligent grounding resistance monitor of the lightning protection equipment, which can generate the technical effect of safety warning.

In order to solve the technical problems, the invention provides the following technical scheme: an intelligent ground resistance monitor of lightning protection equipment comprises a shell, wherein a circuit board is fixedly installed inside the shell, a key input circuit is arranged inside the circuit board, the output end of the key input circuit is electrically connected with a single chip microcomputer processor, the output end of the single chip microcomputer processor is electrically connected with an excitation voltage circuit, the output end of the excitation voltage circuit is electrically connected with a voltage offset circuit, the output end of the voltage offset circuit is electrically connected with a power amplification circuit, the output end of the power amplification circuit is electrically connected with a voltage clamp circuit, the output end of the voltage clamp circuit is electrically connected with a multi-way switch circuit, the output end of a voltage division integrating circuit is electrically connected with a multi-way switch circuit, the output end of the multi-way switch circuit is electrically connected with a program-controlled active filter circuit, and the output end of the program-controlled active filter circuit, the output end of the analog-to-digital conversion circuit is electrically connected with the singlechip processor.

As a preferred technical scheme of the invention, one end of the shell is fixedly provided with a digital display, and the digital display is electrically connected with the singlechip processor.

As a preferred technical scheme of the present invention, a status indicator is fixedly installed at one end of the housing and at one side of the digital display, and the status indicator is electrically connected to the single chip processor.

As a preferred technical solution of the present invention, a setting button is fixedly installed at one end of the housing and below the digital display, and the setting button is electrically connected to the key input circuit.

As a preferred technical solution of the present invention, a voltage measuring terminal is fixedly installed at a position close to a lower end portion of one side of the housing, and the voltage measuring terminal is electrically connected to the voltage clamp circuit.

The voltage measuring terminal is fixedly mounted on one side of the voltage measuring terminal, the current measuring terminal is electrically connected with the current jaw circuit, the current jaw circuit is electrically connected with the pre-amplification circuit, and the pre-amplification circuit is electrically connected with the multi-way switch circuit.

As a preferred technical solution of the present invention, a remote communication terminal is fixedly mounted at a position on one side of the housing and close to the upper end portion, the remote communication terminal is electrically connected to the communication interface circuit, and the communication interface circuit is electrically connected to the output end of the single chip processor.

As a preferable technical solution of the present invention, an external dc power supply terminal is fixedly mounted at a position on one side of the housing and near the upper end portion.

As a preferred technical solution of the present invention, the external dc power supply terminal is electrically connected to the circuit board, the digital display, the setting button, the status indicator light, the voltage measuring terminal, the current measuring terminal, and the remote communication terminal.

Compared with the prior art, the invention can achieve the following beneficial effects:

1. the device is externally connected with a 12V direct current power supply, and a voltage jaw circuit and a current jaw circuit are used for generating an excitation signal by a voltage coil and inducing electromotive force on a tested loop. Under the action of the electromotive force, induced current is generated in the measured loop, and the measured resistance is calculated by measuring the electromotive force and the induced current.

Drawings

FIG. 1 is a schematic diagram of a circuit frame structure according to the present invention;

FIG. 2 is a schematic view of a panel structure according to the present invention;

fig. 3 is a schematic view of the external structure of the present invention.

Wherein: 1. a housing; 2. a circuit board; 3. displaying the number; 4. setting a button; 5. a status indicator light; 6. the external direct current power supply terminal; 7. a voltage measurement terminal; 8. a current measurement terminal; 9. a remote communication terminal; 10. a single chip processor; 11. an excitation voltage circuit; 12. a voltage offset circuit; 13. a power amplification circuit; 14. a voltage clamp circuit; 15. a multi-way switching circuit; 16. a voltage division integration circuit; 17. an analog-to-digital conversion circuit; 18. a program-controlled active filter circuit; 19. a pre-amplification circuit; 20. a current jaw circuit; 21. a key input circuit; 22. a communication interface circuit.

Detailed Description

The present invention will be further described with reference to specific embodiments for the purpose of facilitating an understanding of technical means, characteristics of creation, objectives and functions realized by the present invention, but the following embodiments are only preferred embodiments of the present invention, and are not intended to be exhaustive. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available unless otherwise specified.

Example (b):

as shown in fig. 1, 2 and 3, the invention provides an intelligent ground resistance monitor of lightning protection equipment, which comprises a shell 1, wherein a circuit board 2 is fixedly installed inside the shell 1, and the intelligent ground resistance monitor is characterized in that: the circuit board 2 is internally provided with a key input circuit 21, the output end of the key input circuit 21 is electrically connected with the single chip processor 10, the output end of the single chip processor 10 is electrically connected with an excitation voltage circuit 11, the output end of the excitation voltage circuit 11 is electrically connected with a voltage offset circuit 12, the output end of the voltage offset circuit 12 is electrically connected with a power amplification circuit 13, the output end of the power amplification circuit 13 is electrically connected with a voltage clamp circuit 14, the output end of the voltage clamp circuit 14 is electrically connected with a multi-way switch circuit 15, the output end of the voltage division integration circuit 16 is electrically connected with a multi-way switch circuit 15, the output end of the multi-way switch circuit 15 is electrically connected with a program-controlled active filter circuit 18, the output end of the program-controlled active filter circuit 18 is electrically connected with an analog-to-digital conversion circuit 17.

The key input circuit 21 sends an electric signal to the singlechip processor 10, so that the singlechip processor 10 controls the excitation voltage circuit 11 to send out excitation voltage, the excitation voltage circuit 11 adopts a sine excitation signal based on a DDS digital frequency synthesis technology, and a digital-to-analog converter in a 12-bit voltage mode of a voltage offset circuit in the singlechip is sampled to generate a required pilot frequency 1kHz excitation signal; the voltage is transmitted to the power amplifying circuit 13 through the voltage offset circuit 12, the voltage offset circuit 12 forms a bipolar output by adding a first-stage voltage amplifier on the basis of the unipolar voltage output, and the voltage signal output after passing through the two-stage amplifier is-2.4V. Then the AC voltage signal with the gain of minus 5V to 5V is processed by the next stage operational amplifier; the power amplifying circuit 13 amplifies the output signal of the singlechip, and a class B complementary geminate transistor push-pull circuit is used as an output stage, so that the load capacity is greatly improved, and a rear-stage circuit is driven; then the voltage is transmitted to a voltage clamp circuit 14, the voltage clamp circuit 14 conducts the voltage further, and then the voltage is transmitted to the inside of a voltage division integrating circuit 16, the voltage division integrating circuit 16 adopts a voltage division technology, and the secondary value is changed to be within the voltage input range of the single chip microcomputer analog-to-digital converter and is less than 3.3V; then the signal is transmitted into the multi-way switch circuit 15, the multi-way switch circuit 15 performs multi-stage sampling by a distributed multi-stage amplification method, simultaneously judges the size of a sampling value and the state of a reverse reading control pin, obtains a real signal effective value to realize gain control, mainly depends on channel selection, the multi-way switch circuit 15 transmits voltage into a program control active filter circuit 18, the program control active filter circuit 18 performs band-pass filtering processing, and then high frequency, low frequency and direct current interference of the signal are filtered out to obtain a narrower band signal with the excitation signal frequency as the center frequency; the data signals are transmitted to the inside of the analog-digital conversion circuit 17 through the program-controlled active filter circuit 18, and the analog-digital conversion circuit 17 converts the amplified and filtered alternating current data signals into effective direct current signals of the data signals to be output, so that the conversion from alternating current to direct current is realized; the analog-to-digital conversion circuit 17 finally conducts the voltage back into the chip processor 10.

In another embodiment, as shown in fig. 1, 2 and 3, the embodiment discloses that a digital display 3 is fixedly installed at one end of a housing 1, and the digital display 3 is electrically connected with a single chip processor 10;

the digital display 3 is provided for direct observation of the data obtained by the instrument.

In another embodiment, as shown in fig. 1, 2 and 3, the present embodiment discloses that a status indicator lamp 5 is fixedly installed at one end of the housing 1 and at one side of the digital display 3, and the status indicator lamp 5 is electrically connected to the single chip processor 10;

the arranged state indicating lamp 5 has a certain warning effect and can radiate light rays with different colors.

In another embodiment, as shown in fig. 1, fig. 2 and fig. 3, the embodiment discloses that a setting button 4 is fixedly installed at one end of the housing 1 and below the digital display 3, and the setting button 4 is electrically connected to the key input circuit 21;

the set button 4 is provided for inputting an electric signal for controlling the key input circuit 21 as a starting point position of the entire apparatus.

In another embodiment, as shown in fig. 1, 2 and 3, the present embodiment discloses that a voltage measuring terminal 7 is fixedly installed at a position close to the lower end portion of one side of the housing 1, and the voltage measuring terminal 7 is electrically connected to the voltage clamp circuit 14;

in another embodiment, as shown in fig. 1, the embodiment discloses that a current measuring terminal 8 is fixedly installed on one side of the voltage measuring terminal 7, the current measuring terminal 8 is electrically connected to a current jaw circuit 20, the current jaw circuit 20 is electrically connected to a pre-amplifier circuit 19, and the pre-amplifier circuit 19 is electrically connected to the multi-way switch circuit 15;

the pre-amplifier circuit 19 converts the weak current signal sensed by the current clamp circuit 20 into a proper voltage signal, and uses a multi-stage operational amplifier to process the signal for many times in a way of 10 times gain of each stage, so that small signals with different amplitudes can be amplified to a voltage which is in accordance with the input range of the analog-to-digital converter, the conversion precision is greatly improved, and the processing of later data is facilitated.

In another embodiment, as shown in fig. 1, the embodiment discloses that a remote communication terminal 9 is fixedly mounted at a position on one side of the housing 1 and close to the upper end portion, the remote communication terminal 9 is electrically connected with a communication interface circuit 22, and the communication interface circuit 22 is electrically connected with the output end of the single chip processor 10;

in another embodiment, as shown in fig. 1, 2 and 3, the present embodiment discloses that an external dc power supply terminal 6 is fixedly mounted at a position close to an upper end of one side of the housing 1;

the external 12V DC power supply, the voltage jaw and current jaw circuit 20 is used for the voltage coil to generate the excitation signal, and the electromotive force is induced on the tested loop. Under the action of the electromotive force, induced current is generated in the measured loop, and the measured resistance is calculated by measuring the electromotive force and the induced current.

In another embodiment, as shown in fig. 1, the present embodiment discloses that the external dc power supply terminal 6 is electrically connected to the circuit board 2, the digital display 3, the setting button 4, the status indicator lamp 5, the voltage measuring terminal 7, the current measuring terminal 8 and the remote communication terminal 9.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.