CN217007477U - Resistance test circuit of transformer direct current resistance tester - Google Patents
Resistance test circuit of transformer direct current resistance tester Download PDFInfo
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- CN217007477U CN217007477U CN202123433020.2U CN202123433020U CN217007477U CN 217007477 U CN217007477 U CN 217007477U CN 202123433020 U CN202123433020 U CN 202123433020U CN 217007477 U CN217007477 U CN 217007477U
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Abstract
The utility model discloses a resistance test circuit of a transformer direct-current resistance tester, which comprises a micro control unit, and a constant current source module and an adjustable sampling resistor which are connected with the micro control unit, wherein the adjustable sampling resistor is connected with a voltage acquisition module in parallel, the adjustable sampling resistor is connected with a current acquisition module in series, and the adjustable sampling resistor and the current acquisition module are connected with the constant current source module in parallel. The resistance testing circuit is driven to operate by the power supply driving circuit, the constant current source module is matched for providing constant output voltage for the adjustable sampling resistor, the voltage acquisition module and the current acquisition module are used for measuring voltage signals and current signals of the adjustable sampling resistor, the resistance value of the adjustable sampling resistor is adjusted, the voltage acquisition module and the current acquisition module can be matched for measuring different voltage signals and current signals, and the voltage signals and the current signals can be fed back to the micro control unit.
Description
Technical Field
The utility model relates to the technical field of transformer direct current resistance testers, in particular to a resistance testing circuit of a transformer direct current resistance tester.
Background
The direct current resistance test of transformer winding of the transformer direct current resistance tester is an indispensable test project after the transformer is handed over, overhauled and the tap switch is changed. In general, measuring the dc resistance of the transformer winding and the high power inductive device by conventional methods (bridge method and voltage drop method) is a time-consuming and labor-intensive task. In order to change such a situation, shorten the measurement time and reduce the workload of the tester, a transformer dc resistance tester was developed. The novel power supply technology is adopted, and the novel power supply has the characteristics of rapid measurement, small volume, convenience in use, high measurement precision and the like. The device is an ideal device for measuring the direct current resistance of a transformer winding and a high-power inductive device, and can be used as the direct current resistance value of a grounding wire.
The resistance test circuit of the existing transformer direct current resistance tester is inconvenient to detect and damage the circuit due to the temperature generated by a circuit load in the using process, and cannot well meet the use requirements of people, and technical innovation is performed on the basis of the existing transformer direct current resistance tester according to the above situation.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a resistance test circuit of a transformer direct-current resistance tester, which aims to solve the problems that the temperature generated by a circuit load is inconvenient to detect, the circuit is easy to damage and the output voltage is inconvenient to control in the use process of the resistance test circuit of the existing transformer direct-current resistance tester in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a resistance test circuit of transformer direct current resistance tester, includes little the control unit to and the constant current source module and the adjustable sampling resistor who are connected with little the control unit, adjustable sampling resistor parallel connection has voltage acquisition module, adjustable sampling resistor series connection has current acquisition module, adjustable sampling resistor and current acquisition module and constant current source module parallel connection.
Preferably, the micro control unit is further connected with a temperature sensor.
Preferably, the micro control unit is further connected with a human-computer interaction touch screen.
Preferably, the micro control unit is further connected with a power supply driving circuit, and the power supply driving circuit comprises a stabilized voltage power supply, an operational amplifier circuit connected with the stabilized voltage power supply, a filter connected with the operational amplifier circuit, a voltage stabilizing circuit connected with the filter, and a current protection circuit connected with the voltage stabilizing circuit.
Preferably, the voltage-stabilizing power supply, the operational amplifier circuit, the filter, the voltage stabilizing circuit and the current protection circuit are used for outputting stable voltage for the micro control unit and the resistance test circuit connected with the micro control unit.
Compared with the prior art, the utility model has the following beneficial effects:
according to the utility model, the temperature sensor is used for detecting the temperature signal of the resistance testing circuit and feeding the temperature detection signal back to the micro control unit, if the temperature detection signal exceeds the preset temperature value of the temperature sensor, the micro control unit can be used for disconnecting the power supply of the power supply driving circuit, so that the running safety of the resistance testing circuit can be effectively improved;
the resistance testing circuit is driven to run by the power supply driving circuit, the constant current source module is matched for providing constant output voltage for the adjustable sampling resistor, the voltage acquisition module and the current acquisition module are used for measuring voltage signals and current signals of the adjustable sampling resistor, the resistance value of the adjustable sampling resistor is adjusted, the voltage acquisition module and the current acquisition module can be matched for measuring different voltage signals and current signals, the voltage signals and the current signals can be fed back to the micro control unit, the micro control unit processes the voltage signals and the current signals and converts the voltage signals and the current signals into digital data to be transmitted to the man-machine interaction touch screen, the man-machine interaction touch screen displays the measured data, and the resistance value change of the adjustable sampling resistor can be intuitively known;
the voltage stabilizing power supply provided by the utility model amplifies a voltage signal through the operational amplifier circuit, filters an interference signal through the filter, outputs a stable voltage by matching with the voltage stabilizing circuit, protects the power supply driving circuit through the current protection circuit and avoids the power supply driving circuit from being broken due to overlarge current.
Drawings
FIG. 1 is a schematic front view of the present invention;
fig. 2 is a schematic structural diagram of a power driving circuit according to the present invention.
In the figure: 1. a micro control unit; 2. a power supply driving circuit; 201. a regulated power supply; 202. an operational amplifier circuit; 203. a filter; 204. a voltage stabilizing circuit; 205. a current protection circuit; 3. a constant current source module; 4. adjustable sampling resistance; 5. a voltage acquisition module; 6. a current collection module; 7. a temperature sensor; 8. human-computer interaction touch screen.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a technical solution: a resistance test circuit of a transformer direct current resistance tester comprises a micro control unit 1, a constant current source module 3 and an adjustable sampling resistor 4 which are connected with the micro control unit 1, wherein the micro control unit 1 is also connected with a temperature sensor 7, the temperature sensor 7 detects a temperature signal of the resistance test circuit and feeds the temperature detection signal back to the micro control unit 1, if the temperature detection signal exceeds a preset temperature value of the temperature sensor 7, a power supply of a power supply driving circuit 2 can be disconnected through the micro control unit 1, so that the running safety of the resistance test circuit can be effectively improved, the adjustable sampling resistor 4 is connected with a voltage acquisition module 5 in parallel, the adjustable sampling resistor 4 is connected with a current acquisition module 6 in series, the adjustable sampling resistor 4 and the current acquisition module 6 are connected with the constant current source module 3 in parallel, the micro control unit 1 is also connected with a human-computer interaction touch screen 8, the resistance testing circuit is driven to operate by the power driving circuit 2, the constant current source module 3 is matched with the adjustable sampling resistor 4 to provide constant output voltage, the voltage acquisition module 5 and the current acquisition module 6 are used for measuring voltage signals and current signals of the adjustable sampling resistor 4, the resistance value of the adjustable sampling resistor 4 is adjusted, the voltage acquisition module 5 and the current acquisition module 6 can be matched with the adjustable sampling resistor to measure different voltage signals and current signals, the voltage signals and the current signals can be fed back to the micro control unit 1, the voltage signals and the current signals are processed by the micro control unit 1 to be converted into digital data which is transmitted to the man-machine interaction touch screen 8, the measured data is displayed by the man-machine interaction touch screen 8, and the change of the resistance value of the adjustable sampling resistor 4 can be intuitively known.
Example two
The scheme in the first embodiment is further described in the following with reference to specific working modes, which are described in detail in the following:
as shown in fig. 2, as a preferred embodiment, in addition to the above-mentioned mode, further, the micro control unit 1 is further connected with a power supply driving circuit 2, the power supply driving circuit 2 includes a regulated power supply 201, an operational amplifier circuit 202 connected with the regulated power supply 201, a filter 203 connected with the operational amplifier circuit 202, a voltage stabilizing circuit 204 connected with the filter 203, and a current protection circuit 205 connected with the voltage stabilizing circuit 204, the regulated power supply 201, the operational amplifier circuit 202, the filter 203, the voltage stabilizing circuit 204, and the current protection circuit 205 are used for outputting a stable voltage for the micro control unit 1 and a resistance test circuit connected with the micro control unit 1, the regulated power supply 201 amplifies a voltage signal through the operational amplifier circuit 202 and filters an interference signal through the filter 203, and outputs a stable voltage in cooperation with the voltage stabilizing circuit 204 and protects the power supply driving circuit 2 through the current protection circuit 205, avoid the power driving circuit 2 from being broken due to overlarge current.
The working principle of the resistance testing circuit of the transformer direct-current resistance tester is as follows: firstly, the voltage-stabilizing power supply 201 amplifies a voltage signal through the operational amplifier circuit 202, filters an interference signal through the filter 203, outputs a stable voltage in cooperation with the voltage-stabilizing circuit 204, and protects the power driving circuit 2 through the current protection circuit 205;
then, the power driving circuit 2 is used for driving the resistance testing circuit to operate, the constant current source module 3 is used for providing constant output voltage for the adjustable sampling resistor 4, the voltage acquisition module 5 and the current acquisition module 6 are used for measuring voltage signals and current signals of the adjustable sampling resistor 4, the resistance value of the adjustable sampling resistor 4 is adjusted, the voltage acquisition module 5 and the current acquisition module 6 can be used for measuring different voltage signals and current signals in cooperation with the voltage acquisition module 5 and the current acquisition module 6, the voltage signals and the current signals can be fed back to the micro control unit 1, the micro control unit 1 processes the voltage signals and the current signals to convert the voltage signals and the current signals into digital data to be transmitted to the man-machine interaction touch screen 8, the measurement data is displayed by the man-machine interaction touch screen 8, the resistance value change of the adjustable sampling resistor 4 can be intuitively known, and then the temperature sensor 7 is used for detecting the temperature signals of the resistance testing circuit, and the temperature detection signal is fed back to the micro control unit 1, and if the temperature detection signal exceeds the preset temperature value of the temperature sensor 7, the power supply of the power supply driving circuit 2 can be disconnected through the micro control unit 1.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a resistance test circuit of transformer direct current resistance tester, includes little the control unit (1) to and constant current source module (3) and adjustable sampling resistor (4) be connected with little the control unit (1), its characterized in that: adjustable sampling resistor (4) parallel connection has voltage acquisition module (5), adjustable sampling resistor (4) series connection has current acquisition module (6), adjustable sampling resistor (4) and current acquisition module (6) and constant current source module (3) parallel connection.
2. The resistance test circuit of the transformer direct current resistance tester according to claim 1, wherein: the micro control unit (1) is also connected with a temperature sensor (7).
3. The resistance test circuit of the transformer dc resistance tester as claimed in claim 1, wherein: the micro control unit (1) is also connected with a human-computer interaction touch screen (8).
4. The resistance test circuit of the transformer direct current resistance tester according to claim 1, wherein: the micro control unit (1) is further connected with a power supply driving circuit (2), and the power supply driving circuit (2) comprises a stabilized voltage power supply (201), an operational amplifier circuit (202) connected with the stabilized voltage power supply (201), a filter (203) connected with the operational amplifier circuit (202), a voltage stabilizing circuit (204) connected with the filter (203), and a current protection circuit (205) connected with the voltage stabilizing circuit (204).
5. The resistance test circuit of the transformer DC resistance tester according to claim 4, wherein: the voltage stabilizing power supply (201), the operational amplifier circuit (202), the filter (203), the voltage stabilizing circuit (204) and the current protection circuit (205) are used for outputting stable voltage for the micro control unit (1) and a resistance test circuit connected with the micro control unit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123433020.2U CN217007477U (en) | 2021-12-30 | 2021-12-30 | Resistance test circuit of transformer direct current resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123433020.2U CN217007477U (en) | 2021-12-30 | 2021-12-30 | Resistance test circuit of transformer direct current resistance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217007477U true CN217007477U (en) | 2022-07-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123433020.2U Active CN217007477U (en) | 2021-12-30 | 2021-12-30 | Resistance test circuit of transformer direct current resistance tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217007477U (en) |
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2021
- 2021-12-30 CN CN202123433020.2U patent/CN217007477U/en active Active
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