CN218995647U - Detection circuit of resistance tester - Google Patents
Detection circuit of resistance tester Download PDFInfo
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- CN218995647U CN218995647U CN202223265703.6U CN202223265703U CN218995647U CN 218995647 U CN218995647 U CN 218995647U CN 202223265703 U CN202223265703 U CN 202223265703U CN 218995647 U CN218995647 U CN 218995647U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a detection circuit of a resistance tester, which relates to the technical field of electric power system measurement and comprises the following components: the resistor connection circuit to be tested comprises a resistor wiring port to be tested, a first group of wiring circuits and a second group of wiring circuits, and the first group of wiring circuits and the second group of wiring circuits are respectively connected with the resistor wiring port to be tested; the power supply module comprises a first group of power supplies and a second group of power supplies, wherein the input end of the first group of wiring circuits is connected with the first group of power supplies, and the input end of the second group of wiring circuits is connected with the second group of power supplies; the voltage detection circuit is arranged on the first group of wiring circuits and the second group of wiring circuits and used for detecting the electrification condition of the resistor to be detected; the standard resistor detection circuit is connected in series with the resistor connection circuit to be detected and is used for detecting the current value and the voltage value of the resistor to be detected; a high pressure source. The utility model has simple testing process, convenient operation and high measuring accuracy.
Description
Technical Field
The utility model relates to the technical field of electric power system measurement, in particular to a detection circuit of a resistance tester.
Background
In an electric power system, the insulation performance of electric equipment is related to the safety of the whole power grid operation, and one of the most basic conditions of the normal operation of the electric equipment is the insulation degree of an insulation material, namely the value of insulation resistance. When heated and humidified, the insulating material ages, causing a decrease in insulation resistance, resulting in leakage or short-circuit accidents of electrical equipment. In order to avoid accidents, it is required to constantly measure insulation resistance of various electric devices. The tool for measuring the insulation resistance of various electrical devices is a megohmmeter.
In the related art, when the cable cores of the common megohmmeter are increased, the workload can be correspondingly increased during inter-phase measurement, the process is troublesome, one person is required to be specially responsible for recording, the other person constantly changes the position of the probe, the measurement is easy to miss, the discharge is required to be carried out when the insulation resistance is measured each time, the frequent change is required between the probe and the clamp, the monitoring time is long, the operation is frequent, and the efficiency is low.
Disclosure of Invention
In order to solve the defects in the prior art, the utility model provides a detection circuit of a resistance tester.
The technical scheme provided by the utility model is as follows:
a detection circuit of a resistance tester, comprising:
the resistor connection circuit to be tested comprises a resistor wiring port to be tested, a first group of wiring circuits and a second group of wiring circuits, and the first group of wiring circuits and the second group of wiring circuits are respectively connected with the resistor wiring port to be tested;
the power supply module comprises a first group of power supplies and a second group of power supplies, wherein the input end of the first group of wiring circuits is connected with the first group of power supplies, and the input end of the second group of wiring circuits is connected with the second group of power supplies;
the voltage detection circuit is arranged on the first group of wiring circuits and the second group of wiring circuits and used for detecting the electrification condition of the resistor to be detected;
the standard resistor detection circuit is connected in series with the resistor connection circuit to be detected and is used for detecting the current value and the voltage value of the resistor to be detected;
the high-voltage source provides power for the standard resistance detection circuit, and provides voltage for the power supply through the standard resistance detection circuit;
the output end of the high-voltage source is connected with the standard resistance detection circuit, the output end of the standard resistance detection circuit is connected with the power supply, the output end of the power supply is connected with the resistor connection circuit to be tested, and the resistor connection circuit to be tested is connected with the resistor to be tested.
The voltage detection circuit comprises a direct current voltage detection circuit and an alternating current voltage detection circuit, wherein the direct current voltage detection circuit is connected in series on the first group of wiring circuits and the second group of wiring circuits, and the alternating current voltage detection circuit is connected in series on the first group of wiring circuits and the second group of wiring circuits.
According to a further technical scheme, the direct-current voltage detection circuit comprises a first resistor and a second resistor, wherein the first end of the first resistor is connected with a first resistor wiring circuit, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with a second resistor wiring circuit, and the first end of the second resistor is a direct-current voltage acquisition end.
According to a further technical scheme of the utility model, the alternating voltage detection circuit comprises a third resistor and a transformer, wherein the input end of the transformer is connected with the first input end of the primary side of the transformer through the third resistor, the second resistor wiring circuit is connected with the second input end of the primary side of the transformer, and the secondary side of the transformer is an alternating voltage acquisition end.
As a further technical solution of the present utility model, the standard resistance detection circuit includes: the high-voltage power supply comprises a standard resistor, a connecting switch, a high-voltage change-over switch, a current-limiting resistor and a high-voltage source detection circuit, wherein the output end of the high-voltage source is connected with the high-voltage change-over switch through the current-limiting resistor, the output end of the high-voltage change-over switch is connected with the first end of the standard resistor through the connecting switch, the second end of the standard resistor is connected with a resistor test circuit, and the second end of the standard resistor is connected with a current sampling interface.
As a further technical solution of the present utility model, the high voltage source detection circuit includes: and the fifth resistor and the sixth resistor are connected in series and connected with the high-voltage output voltage.
The utility model further adopts the technical scheme that the utility model further comprises: the discharging circuit comprises a discharging switch, one end of the discharging switch is connected with the high-voltage power supply circuit, and the other end of the discharging switch is grounded.
The beneficial effects of the utility model are as follows:
1. the connecting circuit of the resistor to be tested can be provided with a plurality of groups, a plurality of resistors to be tested can be externally connected for measurement, the testing process is simple, the operation is convenient, the power supply supplies testing voltage to the resistor to be tested, before the testing is started, the voltage monitoring circuit is used for detecting whether the resistor to be tested is electrified or not, the direct current detection and the alternating current detection are included, and when the electrification is detected, the detection is stopped; when the detection result is that the current is not charged, resistance detection is performed.
2. According to the utility model, the standard resistor detection circuit is arranged, the resistance value of the resistor to be measured is calculated according to the measured voltage value and the current value, and the measurement accuracy is high.
3. According to the utility model, a plurality of groups of standard resistors can be arranged according to the resistance, and in the test process, the standard resistors with different specifications are selected for measurement according to the measured resistor, so that the measurement accuracy is improved.
4. In order to prevent electric shock or safety accident, a discharging circuit is also arranged on the power supply line of the standard resistance detection circuit.
Drawings
FIG. 1 is a diagram showing a control structure of a detection circuit of a resistance tester according to the present utility model;
FIG. 2 is a diagram showing a structure of a circuit for connecting a resistor to be tested according to the present utility model;
FIG. 3 is a schematic diagram of a DC voltage detection circuit according to the present utility model;
FIG. 4 is a schematic diagram of an AC voltage detection circuit according to the present utility model;
FIG. 5 is a block diagram of a standard resistance detection circuit according to the present utility model;
Detailed Description
The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model.
As shown in fig. 1-3, which illustrate a specific embodiment of the present utility model,
a detection circuit of a resistance tester, comprising:
the resistor connection circuit to be tested comprises a resistor wiring port to be tested, a first group of wiring circuits and a second group of wiring circuits, and the first group of wiring circuits and the second group of wiring circuits are respectively connected with the resistor wiring port to be tested;
the power supply module comprises a first group of power supplies and a second group of power supplies, wherein the input end of the first group of wiring circuits is connected with the first group of power supplies, and the input end of the second group of wiring circuits is connected with the second group of power supplies;
the voltage detection circuit is arranged on the first group of wiring circuits and the second group of wiring circuits and used for detecting the electrification condition of the resistor to be detected;
the standard resistor detection circuit is connected in series with the resistor connection circuit to be detected and is used for detecting the current value and the voltage value of the resistor to be detected;
the high-voltage source provides power for the standard resistance detection circuit, and provides voltage for the power supply through the standard resistance detection circuit;
the output end of the high-voltage source is connected with the standard resistance detection circuit, the output end of the standard resistance detection circuit is connected with the power supply, the output end of the power supply is connected with the resistor connection circuit to be tested, and the resistor connection circuit to be tested is connected with the resistor to be tested.
In the embodiment of the utility model, a plurality of groups of resistor connection circuits to be tested can be arranged, and a plurality of resistors to be tested can be connected to the resistor connection circuits to be tested to measure simultaneously; when the detection result is that the current is not charged, resistance detection is performed.
According to the utility model, the standard resistor detection circuit is arranged, the resistance value of the resistor to be measured is calculated according to the measured voltage value and the current value, and the measurement accuracy is high.
In the embodiment of the utility model, the voltage detection circuit comprises a direct-current voltage detection circuit and an alternating-current voltage detection circuit, wherein the direct-current voltage detection circuit is connected in series on the first group of wiring circuits and the second group of wiring circuits, and the alternating-current voltage detection circuit is connected in series on the first group of wiring circuits and the second group of wiring circuits.
Referring to fig. 2, the direct-current voltage detection circuit includes a first resistor and a second resistor, wherein a first end of the first resistor is connected with a first resistor wiring circuit, a second end of the first resistor is connected with a first end of the second resistor, a second end of the second resistor is connected with a second resistor wiring circuit, and a first end of the second resistor is a direct-current voltage acquisition end. The first resistor and the second resistor form a voltage dividing circuit, and whether direct current voltage exists or not is judged by collecting the direct current voltage.
Referring to fig. 3, the ac voltage detection circuit includes a third resistor and a transformer, the input end of the transformer is connected with the first input end of the primary side of the transformer through the third resistor and the first resistor connection circuit, the second resistor connection circuit is connected with the second input end of the primary side of the transformer, and the secondary side of the transformer is an ac voltage acquisition end. The transformer realizes the transformation of alternating voltage, converts the alternating voltage into low-voltage alternating current, is convenient for collect, and is convenient for judge whether alternating voltage exists.
Referring to fig. 4, the standard resistance detection circuit includes: the high-voltage power supply comprises a standard resistor, a connecting switch, a high-voltage change-over switch, a current-limiting resistor and a high-voltage source detection circuit, wherein the output end of the high-voltage source is connected with the high-voltage change-over switch through the current-limiting resistor, the output end of the high-voltage change-over switch is connected with the first end of the standard resistor through the connecting switch, the second end of the standard resistor is connected with a resistor test circuit, and the second end of the standard resistor is connected with a current sampling interface.
In the embodiment of the utility model, a plurality of groups of standard resistors can be arranged according to the resistance value, and in the test process, the standard resistors with different specifications are selected for measurement according to the measured resistor, so that the measurement accuracy is improved.
The resistor to be tested is connected with the standard resistor in series, the current value measured on the standard resistor is the current value of the resistor to be tested, the voltage value of the resistor to be tested is obtained by accurately measuring the high voltage source through the high voltage source detection circuit, and the resistance value of the resistor to be tested is obtained according to the relation between the voltage value and the current value to finish the test.
Wherein, high voltage source detection circuit includes: and the fifth resistor and the sixth resistor are connected in series and connected with the high-voltage output voltage.
After the detection is finished, the voltage is still remained on the standard resistance detection circuit because the detected resistor is pressurized, in order to prevent electric shock or safety accidents, a discharge circuit is further arranged on a power supply line of the standard resistance detection circuit, the discharge circuit comprises a discharge switch, one end of the discharge switch is connected with the high-voltage power supply circuit, and the other end of the discharge switch is grounded.
The present utility model has been described in detail above, but the present utility model is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present utility model. Many other changes and modifications may be made without departing from the spirit and scope of the utility model. It is to be understood that the utility model is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (7)
1. A detection circuit of a resistance tester, comprising:
the resistor connection circuit to be tested comprises a resistor wiring port to be tested, a first group of wiring circuits and a second group of wiring circuits, and the first group of wiring circuits and the second group of wiring circuits are respectively connected with the resistor wiring port to be tested;
the power supply comprises a first group of power supplies and a second group of power supplies, wherein the input end of the first group of wiring circuits is connected with the first group of power supplies, and the input end of the second group of wiring circuits is connected with the second group of power supplies;
the voltage detection circuit is arranged on the first group of wiring circuits and the second group of wiring circuits and used for detecting the electrification condition of the resistor to be detected;
the standard resistor detection circuit is connected in series with the resistor connection circuit to be detected and is used for detecting the current value and the voltage value of the resistor to be detected;
the high-voltage source provides power for the standard resistance detection circuit, and provides voltage for the power supply through the standard resistance detection circuit;
the output end of the high-voltage source is connected with the standard resistance detection circuit, the output end of the standard resistance detection circuit is connected with the power supply, the output end of the power supply is connected with the resistor connection circuit to be tested, and the resistor connection circuit to be tested is connected with the resistor to be tested.
2. The circuit of claim 1, wherein the voltage detection circuit comprises a dc voltage detection circuit and an ac voltage detection circuit, the dc voltage detection circuit being connected in series with the first set of wiring circuits and the second set of wiring circuits, the ac voltage detection circuit being connected in series with the first set of wiring circuits and the second set of wiring circuits.
3. The detecting circuit of claim 2, wherein the dc voltage detecting circuit comprises a first resistor and a second resistor, the first end of the first resistor is connected to the first resistor wiring circuit, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the second resistor wiring circuit, and the first end of the second resistor is a dc voltage collecting end.
4. The detecting circuit of a resistance tester according to claim 2, wherein the ac voltage detecting circuit comprises a third resistor and a transformer, the input end of the transformer is connected with the first input end of the primary side of the transformer through the third resistor, the second resistor is connected with the second input end of the primary side of the transformer, and the secondary side of the transformer is an ac voltage collecting end.
5. The resistance tester detection circuit of claim 1, wherein the standard resistance detection circuit comprises: the high-voltage power supply comprises a standard resistor, a connecting switch, a high-voltage change-over switch, a current-limiting resistor and a high-voltage source detection circuit, wherein the output end of the high-voltage source is connected with the high-voltage change-over switch through the current-limiting resistor, the output end of the high-voltage change-over switch is connected with the first end of the standard resistor through the connecting switch, the second end of the standard resistor is connected with a resistor test circuit, and the second end of the standard resistor is connected with a current sampling interface.
6. The resistance tester detection circuit of claim 5, wherein the high voltage source detection circuit comprises: and the fifth resistor and the sixth resistor are connected in series and connected with the high-voltage output voltage.
7. The detection circuit of a resistance tester according to claim 1, further comprising: the discharging circuit comprises a discharging switch, one end of the discharging switch is connected with the high-voltage power supply circuit, and the other end of the discharging switch is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223265703.6U CN218995647U (en) | 2022-12-06 | 2022-12-06 | Detection circuit of resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223265703.6U CN218995647U (en) | 2022-12-06 | 2022-12-06 | Detection circuit of resistance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218995647U true CN218995647U (en) | 2023-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223265703.6U Active CN218995647U (en) | 2022-12-06 | 2022-12-06 | Detection circuit of resistance tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218995647U (en) |
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2022
- 2022-12-06 CN CN202223265703.6U patent/CN218995647U/en active Active
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