CN219871551U - Ground resistance loop monitoring device without auxiliary grounding point - Google Patents
Ground resistance loop monitoring device without auxiliary grounding point Download PDFInfo
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- CN219871551U CN219871551U CN202321107624.4U CN202321107624U CN219871551U CN 219871551 U CN219871551 U CN 219871551U CN 202321107624 U CN202321107624 U CN 202321107624U CN 219871551 U CN219871551 U CN 219871551U
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 8
- 238000005070 sampling Methods 0.000 claims abstract description 25
- 230000002093 peripheral effect Effects 0.000 claims abstract description 17
- 238000004891 communication Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 101100129496 Arabidopsis thaliana CYP711A1 gene Proteins 0.000 description 1
- 101100083446 Danio rerio plekhh1 gene Proteins 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
The utility model discloses a ground resistance loop monitoring device without an auxiliary grounding point, which comprises: the AC-DC power supply circuit, the ground resistance detection circuit, the zero ground voltage sampling circuit, the zero thermal voltage sampling circuit, the display circuit, the communication circuit, the singlechip and the peripheral circuit, the AC-DC power supply circuit, the ground resistance detection circuit, the zero ground voltage sampling circuit, the zero thermal voltage sampling circuit, the display circuit and the communication circuit are respectively and electrically connected with the singlechip and the peripheral circuit, the singlechip and the peripheral circuit comprise an MCU, and the ground resistance detection circuit comprises: the device comprises a capacitor charging circuit unit, a relay switching circuit unit, a capacitor discharging circuit unit, a current sampling resistor unit and a zero ground circuit measuring circuit unit. The utility model has the beneficial effects that: the detection device can conveniently detect the grounding resistance, and can display and record data back.
Description
Technical Field
The utility model relates to the technical field of lightning protection, in particular to a grounding resistance loop monitoring device without an auxiliary grounding point.
Background
In current power monitoring systems, the ground resistance should be measured periodically. The grounding resistance is measured by a grounding resistance measuring instrument, and the grounding resistance measurement consists of a self-contained alternating current power supply (a hand-operated generator or an electronic power supply) and a potential difference meter type measuring mechanism.
Accordingly, the prior art has drawbacks and needs improvement.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provides a grounding resistance loop monitoring device without an auxiliary grounding point.
The technical scheme of the utility model is as follows: the utility model provides a ground resistance loop detection device without an auxiliary grounding point, which comprises: the AC-DC power supply circuit, the ground resistance detection circuit, the zero ground voltage sampling circuit, the zero thermal voltage sampling circuit, the display circuit, the communication circuit, the singlechip and the peripheral circuit, the AC-DC power supply circuit, the ground resistance detection circuit, the zero ground voltage sampling circuit, the zero thermal voltage sampling circuit, the display circuit and the communication circuit are respectively and electrically connected with the singlechip and the peripheral circuit, the singlechip and the peripheral circuit comprise an MCU, and the ground resistance detection circuit comprises: the device comprises a capacitor charging circuit unit, a relay switching circuit unit, a capacitor discharging circuit unit, a current sampling resistor unit and a zero ground circuit measuring circuit unit.
Further, the communication circuit comprises an RS485 communication unit.
Further, the display circuit comprises an OLED display screen unit.
By adopting the scheme, the utility model has the beneficial effects that: the detection device can conveniently detect the grounding resistance, and can display data and record the data back, so that the traditional three-wire method does not require construction of a plurality of auxiliary grounding points, and is simple and convenient to operate.
Drawings
FIG. 1 is a functional block diagram of an embodiment of the present utility model.
Fig. 2 is a circuit diagram of a zero thermal voltage sampling circuit according to an embodiment of the utility model.
Fig. 3 is a circuit diagram of a zero-ground voltage sampling circuit according to an embodiment of the utility model.
Fig. 4 is a circuit diagram of a ground resistance detection circuit according to an embodiment of the utility model.
Fig. 5 is a circuit diagram of a charge-discharge switching control circuit of a capacitor according to an embodiment of the utility model.
Fig. 6A to 6D are schematic diagrams of a single chip microcomputer and a peripheral circuit according to an embodiment of the utility model.
Fig. 7 is a schematic diagram of an AC-DC power circuit according to an embodiment of the utility model.
Fig. 8A to 8D are schematic diagrams of a display circuit according to an embodiment of the utility model.
Fig. 9A and 9B are schematic diagrams of a communication circuit according to an embodiment of the utility model.
Detailed Description
The utility model will be described in detail below with reference to the drawings and the specific embodiments.
Referring to fig. 1 to 9B in combination, in the present embodiment, the present utility model provides a ground resistance loop monitoring device without an auxiliary grounding point, comprising: the AC-DC power supply circuit, the ground resistance detection circuit, the zero-voltage sampling circuit, the display circuit, the communication circuit, the singlechip and the peripheral circuit are electrically connected with the singlechip and the peripheral circuit respectively.
Specifically, the AC-DC power supply circuit is used for converting commercial power into a direct current power supply of 5V for the monitoring device to use.
Specifically, the display circuit comprises an OLED display screen unit, and is used for displaying contents, such as measurement data and the like. The keys K1 and K2 are input keys of the device, and alarm data setting and data checking are provided.
Specifically, the communication circuit comprises an RS485 communication unit, and comprises a communication chip MAX1 and a model MAX485, and the communication circuit is used for communicating with the outside and can send the test result to the outside.
Specifically, the zero thermal power voltage sampling circuit is used for providing ADC voltage for the singlechip, and comprises: a first voltage division sampling circuit unit and a first peak voltage holding circuit unit, wherein the first voltage division sampling circuit unit includes: resistor R20, resistor R22, resistor R30, the first peak voltage holding circuit unit includes device LM1, device LM2, and peripheral elements thereof.
Specifically, the zero ground voltage sampling circuit is used for providing ADC voltage for the singlechip, and comprises: a second voltage division sampling circuit unit and a second peak voltage holding circuit unit, wherein the second voltage division sampling circuit unit includes: resistor R44, resistor R45, resistor R46, the second peak voltage holding circuit unit includes device LM3, device LM4, and peripheral elements thereof.
The ground resistance detection circuit is used for detecting ground resistance, and comprises: the device comprises a capacitor charging circuit unit, a relay switching circuit unit, a capacitor discharging circuit unit, a current sampling resistor unit and a zero ground circuit measuring circuit unit. The capacitor charging loop unit comprises an L line, a resistor R12, a resistor R52, a resistor R55, a relay K4, a capacitor C28, a resistor R50, a diode D12 and an N line, and when no test command is given, the capacitor C28 is full of voltage to prepare for measurement. When testing is carried out, the relay K4 acts, the capacitor C28, the resistor R50, the device BT1, the N line, the ground wire and the relay K4 form a discharge loop, a voltage is applied to the device BT1, the capacitor C28 carries out discharge action, signals of the voltage on the resistor R50 and zero ground voltage are amplified and sent to the singlechip and the peripheral circuit for AD data processing, and when the data processing is finished, the singlechip and the peripheral circuit output voltage signals to drive the relay K4 to cut off a charging loop; and (5) finishing the measurement.
The singlechip and the peripheral circuit comprise an MCU which is used for data processing and controlling the circuit work of each part of the device.
In summary, the detection device can conveniently detect the grounding resistance, and can display data and record the data back, compared with the traditional three-wire method, the method does not require construction of a plurality of auxiliary grounding points, and is simple and convenient to operate.
The foregoing description of the preferred embodiment of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (3)
1. A ground resistance loop monitoring device without an auxiliary grounding point, comprising: the AC-DC power supply circuit, the ground resistance detection circuit, the zero ground voltage sampling circuit, the zero thermal voltage sampling circuit, the display circuit, the communication circuit, the singlechip and the peripheral circuit, the AC-DC power supply circuit, the ground resistance detection circuit, the zero ground voltage sampling circuit, the zero thermal voltage sampling circuit, the display circuit and the communication circuit are respectively and electrically connected with the singlechip and the peripheral circuit, the singlechip and the peripheral circuit comprise an MCU, and the ground resistance detection circuit comprises: the device comprises a capacitor charging circuit unit, a relay switching circuit unit, a capacitor discharging circuit unit, a current sampling resistor unit and a zero ground circuit measuring circuit unit.
2. The ground resistance loop monitor without auxiliary grounding point according to claim 1, wherein said communication circuit comprises an RS485 communication unit.
3. The ground resistance loop monitor without auxiliary grounding point according to claim 1, wherein said display circuit comprises an OLED display screen unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321107624.4U CN219871551U (en) | 2023-05-09 | 2023-05-09 | Ground resistance loop monitoring device without auxiliary grounding point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321107624.4U CN219871551U (en) | 2023-05-09 | 2023-05-09 | Ground resistance loop monitoring device without auxiliary grounding point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219871551U true CN219871551U (en) | 2023-10-20 |
Family
ID=88344718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321107624.4U Active CN219871551U (en) | 2023-05-09 | 2023-05-09 | Ground resistance loop monitoring device without auxiliary grounding point |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219871551U (en) |
-
2023
- 2023-05-09 CN CN202321107624.4U patent/CN219871551U/en active Active
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