CN210604926U - DC power supply insulation impedance detection device to ground - Google Patents
DC power supply insulation impedance detection device to ground Download PDFInfo
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- CN210604926U CN210604926U CN201921311364.6U CN201921311364U CN210604926U CN 210604926 U CN210604926 U CN 210604926U CN 201921311364 U CN201921311364 U CN 201921311364U CN 210604926 U CN210604926 U CN 210604926U
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Abstract
The utility model relates to the field of electric auxiliary equipment, and discloses a direct current power supply insulation impedance detection device to ground; the method comprises the following steps: the detection bridge is connected with the positive electrode and the negative electrode of the direct current power supply and outputs a detection result; the signal processing circuit is connected with the detection bridge and used for converting the output detection result into a digital signal; and the calculation circuit is connected with the signal processing circuit and is used for calculating the digital signal into a direct-current power supply insulation resistance value to the ground. The utility model discloses a processing circuit handles the last demonstration by unbalanced bridge's measurement back on the display screen, has overcome among the prior art balanced bridge and has existed the difficult problem that causes easily to miss reporting and mistake, has improved the accurate degree that the direct current source detected insulation impedance to ground greatly.
Description
Technical Field
The utility model relates to an electric auxiliary assembly technical field, more specifically say, in particular to direct current power supply insulation impedance detection device to ground.
Background
The direct current power supply has poor insulation resistance to the ground or the resistance value is lower than a specified value, and the direct current power supply can form high voltage to the ground, so that the shell of equipment using the direct current power supply is electrified, the equipment is easy to damage, and the personal safety is threatened. Therefore, it is necessary to detect the insulation resistance of the dc power supply to ground so as to take corresponding adjustment measures in time and ensure that the insulation resistance always meets the requirements.
In the prior art, a same large-resistance resistor is connected in parallel between a positive electrode and a negative electrode of a direct-current power supply and the ground respectively, and an intermediate node is connected with the ground through a leakage current sensor. When leakage current exists between the positive electrode of the direct current power supply and the ground, the numerical value of Rx (the current positive electrode of the direct current power supply and the ground resistance) at the moment can be measured, the leakage current is measured to be i through a leakage current sensor, the positive electrode voltage and the negative electrode voltage of the direct current power supply are Udc, and Rx is calculated to be Udc/i. Similarly, when there is leakage current between the negative pole of the dc power supply and the ground, Ry is calculated to be Udc/i. And comparing the current DC power supply with the insulation resistance value specified in the standard specification to judge whether the insulation resistance of the positive electrode and the negative electrode of the current DC power supply to the ground is good or not. Existing detection. The conventional balanced resistance method in the prior art is simple and easy to implement, can accurately judge the single-point grounding fault, but the complex fault is difficult to detect out a fault branch, and is easy to cause missed report and false report.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct current power supply insulation impedance detection device to reduce the probability of missing reporting and mistake.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the design is a DC power insulation to ground impedance detection device, including:
the detection bridge is connected with the positive electrode and the negative electrode of the direct current power supply and outputs a detection result;
the signal processing circuit is connected with the detection bridge and used for converting the output detection result into a digital signal;
and the calculation circuit is connected with the signal processing circuit and is used for calculating the digital signal into a direct-current power supply insulation resistance value to the ground.
Preferably, an interface circuit is further included, which interconnects the detection bridge and the dc power supply.
Preferably, the device further comprises a display screen, wherein the display screen is connected with the calculation circuit and is used for displaying that the digital signal is calculated into a direct current power supply insulation resistance value to ground.
Preferably, the display device further comprises a power supply circuit, wherein the power supply circuit is connected with the signal processing circuit, the computing circuit and the display screen.
Preferably, the signal processing circuit includes a signal amplifying circuit, a filter circuit, and an analog-to-digital conversion circuit.
Preferably, the display screen is an LCD display screen.
Preferably, the calculation circuit comprises one chip of a single chip microcomputer, a PLC or an MCU.
Compared with the prior art, the utility model has the advantages of: the utility model discloses a processing circuit handles the last demonstration by unbalanced bridge's measurement back on the display screen, has overcome among the prior art balanced bridge and has existed the difficult problem that causes easily to miss reporting and mistake, has improved the accurate degree that the direct current source detected insulation impedance to ground greatly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a dc power supply insulation resistance detection device to ground according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a detection bridge according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.
Referring to fig. 1, an apparatus for detecting insulation impedance of a dc power source to ground according to an embodiment of the present invention includes: the detection bridge is connected with the positive electrode and the negative electrode of the direct current power supply and outputs a detection result; the signal processing circuit is connected with the detection bridge and used for converting the output detection result into a digital signal; the computing circuit is connected with the signal processing circuit and is used for computing the digital signal into a direct-current power supply insulation resistance value to ground; further comprising an interface circuit interconnecting the detection bridge and the dc power supply; the display screen is connected with the calculation circuit and used for displaying the digital signal and calculating the digital signal into a direct-current power supply insulation impedance value to the ground; the power supply circuit is connected with the signal processing circuit, the computing circuit and the display screen; the signal processing circuit comprises a signal amplifying circuit, a filter circuit and an analog-to-digital conversion circuit; the display screen is an LCD display screen; the computing circuit comprises a chip of a single chip microcomputer, a PLC or an MCU.
As shown in fig. 2, in the embodiment of the present invention, the interface circuit is respectively connected to the positive electrode and the negative electrode of the dc power supply, the positive electrode and the negative electrode after connection are connected to the bridge formed by the resistors R1, R2, R3, and R4, and the measurement principle is as follows: when the relay K1 is in a closed state and the relay K2 is in an open state, the outputs of U1 and U2 are measured; obtaining a group of output voltage values; when the relay K1 is in the open state and the relay K2 is in the closed state, the outputs of U1 and U2 are measured. And calculating the equivalent ground resistance by the calculating circuit through the two groups of voltage values.
The specific calculation process is that U is bus voltage, U + is positive bus-to-ground voltage, U-is negative bus-to-ground voltage, and then U ═ U + + U-, the relationship between bus voltage and measurement voltage is expressed by formula (1).
When the relay K1 is closed and the relay K2 is opened, a group of bus voltage and measuring voltage relations are obtained:
the kirchhoff current equation can be obtained at point a:
when the relay K1 is opened and the relay K is closed, a set of bus voltage and measured voltage relations are obtained:
similarly, at point a, the kirchhoff current equation can be given:
by combining the above equations, the expression of the ground resistance can be obtained as follows:
the formula (1) to the formula (6) can be calculated by a calculating circuit and finally displayed on a display screen.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, various changes and modifications can be made by the owner of the patent within the scope of the appended claims, for example, as long as the protection scope described in the claims of the present invention is not exceeded.
Claims (7)
1. A DC power supply insulation resistance detection device to ground, characterized by comprising:
the detection bridge is connected with the positive electrode and the negative electrode of the direct current power supply and outputs a detection result;
the signal processing circuit is connected with the detection bridge and used for converting the output detection result into a digital signal;
and the calculation circuit is connected with the signal processing circuit and is used for calculating the digital signal into a direct-current power supply insulation resistance value to the ground.
2. A dc power supply to ground isolation impedance detection apparatus as defined in claim 1, further comprising an interface circuit interconnecting said detection bridge and said dc power supply.
3. The apparatus as claimed in claim 2, further comprising a display screen, connected to the computing circuit, for displaying the digital signal computed as the dc power supply insulation resistance value.
4. A dc power supply to ground insulation impedance detection device according to claim 3, further comprising a power supply circuit, said power supply circuit being connected to said signal processing circuit, said calculation circuit and said display screen.
5. The apparatus of claim 2, wherein the signal processing circuit comprises a signal amplifying circuit, a filter circuit and an analog-to-digital conversion circuit.
6. A dc power supply to ground insulation resistance detection device as claimed in claim 3, wherein said display screen is an LCD display screen.
7. A dc power supply to ground insulation impedance detection device according to claim 3, wherein said computing circuit comprises a chip of one of a single chip, PLC or MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921311364.6U CN210604926U (en) | 2019-08-12 | 2019-08-12 | DC power supply insulation impedance detection device to ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921311364.6U CN210604926U (en) | 2019-08-12 | 2019-08-12 | DC power supply insulation impedance detection device to ground |
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| CN210604926U true CN210604926U (en) | 2020-05-22 |
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| CN201921311364.6U Active CN210604926U (en) | 2019-08-12 | 2019-08-12 | DC power supply insulation impedance detection device to ground |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022022038A1 (en) * | 2020-07-27 | 2022-02-03 | 宁德时代新能源科技股份有限公司 | Insulation resistance detection circuit and method |
| CN117607545A (en) * | 2024-01-24 | 2024-02-27 | 新风光电子科技股份有限公司 | Communication-free time-sharing round-robin detection method for insulation impedance of multi-machine energy storage converter |
-
2019
- 2019-08-12 CN CN201921311364.6U patent/CN210604926U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022022038A1 (en) * | 2020-07-27 | 2022-02-03 | 宁德时代新能源科技股份有限公司 | Insulation resistance detection circuit and method |
| US11733279B2 (en) | 2020-07-27 | 2023-08-22 | Contemporary Amperex Technology Co., Limited | Circuit and method for detecting insulation resistance |
| CN117607545A (en) * | 2024-01-24 | 2024-02-27 | 新风光电子科技股份有限公司 | Communication-free time-sharing round-robin detection method for insulation impedance of multi-machine energy storage converter |
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