CN214845493U - Direct current resistance test circuit - Google Patents
Direct current resistance test circuit Download PDFInfo
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- CN214845493U CN214845493U CN202121061013.1U CN202121061013U CN214845493U CN 214845493 U CN214845493 U CN 214845493U CN 202121061013 U CN202121061013 U CN 202121061013U CN 214845493 U CN214845493 U CN 214845493U
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Abstract
The utility model discloses a direct current resistance test circuit relates to direct current resistance test technical field. The utility model discloses a display module, constant voltage power supply, voltage measurement circuit, current measurement circuit, marshalling, AD converter and central processing unit, display module, experimental varistor, AD converter and central processing unit establish ties with constant voltage power supply in proper order, and voltage measurement circuit and current measurement circuit all connect in parallel with experimental varistor. The utility model discloses a establish ties with the winding that awaits measuring at setting up experimental varistor to through voltage measurement circuit and the voltage and the electric current of current measurement circuit direct measurement experimental varistor, utilize series circuit partial pressure principle, can accurately calculate the partial pressure that reachs the winding that awaits measuring, recycle ohm's law and calculate the resistance that reachs the winding that awaits measuring, because of the reposition of redundant personnel or the measuring error that the partial pressure appears of other components when can avoiding the direct measurement winding voltage electric current that awaits measuring, further improved measurement accuracy.
Description
Technical Field
The utility model belongs to the technical field of the direct current resistance test, especially, relate to a direct current resistance test circuit.
Background
The direct current resistance test of the transformer winding is an indispensable test project after the transformer is handed over, overhauled and changed with a tap switch, so the actual working state and environment of the transformer are directly influenced by the direct current resistance test result; in the prior art, direct measurement is most commonly carried out by using a direct current resistance tester, but the working principle of the direct current resistance tester is mainly that a transformer winding is directly charged, and the resistance value of the transformer winding is calculated by using ohm's law; although the measuring method is direct and intuitive, large errors exist, accuracy and stability are lacked, and in order to enable the measuring result to be more accurate, a direct current resistance testing circuit is designed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct current resistance test circuit solves the big problem of current direct current resistance tester measuring result error.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme:
the utility model relates to a direct current resistance test circuit, including display module, constant voltage power supply, voltage measurement circuit, current measurement circuit, experimental varistor, AD converter and central processing unit, its characterized in that: the display module, the test variable resistor, the A/D converter and the central processing unit are sequentially connected with a voltage-stabilized power supply in series; the voltage measuring circuit and the current measuring circuit are connected with the test variable resistor in parallel; in the test circuit, the winding to be tested is connected, the test variable resistor is connected with the winding to be tested in series, the voltage and the current of the test variable resistor are measured, the partial voltage of the winding to be tested is calculated, and the resistance value of the winding to be tested is further measured.
Furthermore, the test rheostat comprises a turbine rheostat and an adjusting motor, an output shaft of the adjusting motor is in transmission fit with a turbine of the turbine rheostat and comprises a gear linkage structure, and the adjusting motor is electrically connected with the central processing unit; the display module comprises a liquid crystal display screen and a touch device, the liquid crystal display screen and the touch device are electrically connected through a central processing unit and an A/D converter, a control adjusting instruction is input to the central processing unit through the touch device, the adjusting motor is started to change the resistance value of the turbine rheostat to adjust the electrified current and the partial pressure of the winding to be measured, and therefore the resistance value of the winding to be measured can be calculated for many times, the average value can be obtained, and the measuring error can be reduced.
The voltage measuring circuit comprises a voltage amplifier and a first filter which are connected in parallel; the current measuring circuit comprises a current amplifier and a second filter which are sequentially connected in series; the voltage measuring circuit and the current measuring circuit are used for measuring the voltage and the current of the test variable resistor, so that the voltage of the fixed stabilized voltage supply is used for calculating the partial voltage of the winding to be measured.
Further, the regulated power supply comprises a power adapter and a storage battery, wherein the storage battery is connected with mains supply through the power adapter, and an AC/DC converter is arranged in the power adapter and used for converting mains supply alternating current into direct current for testing the circuit.
Furthermore, a detection interface and a memory are arranged on the surface of the central processing unit, and the detection interface and the memory are electrically connected through the central processing unit and the A/D converter; the surface of the detection interface is connected with a detection wire, and the detection wire connects the winding to be detected into the test circuit in a bolting or splicing mode.
The utility model discloses following beneficial effect has:
the utility model discloses a establish ties with the winding that awaits measuring at setting up experimental varistor to through voltage measurement circuit and the voltage and the electric current of current measurement circuit direct measurement experimental varistor, utilize series circuit partial pressure principle, can accurately calculate the partial pressure that reachs the winding that awaits measuring, recycle ohm's law and calculate the resistance that reachs the winding that awaits measuring, because of the reposition of redundant personnel or the measuring error that the partial pressure appears of other components when can avoiding the direct measurement winding voltage electric current that awaits measuring, further improved measurement accuracy.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a system block diagram of a dc resistance test circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "middle", "outer", "inner", and the like, indicate positional or positional relationships, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Please refer to fig. 1, the present invention relates to a dc resistance testing circuit, which comprises a display module, a voltage-stabilized power supply, a voltage measuring circuit, a current measuring circuit, an experimental varistor, an a/D converter and a central processing unit, and is characterized in that: the display module, the test variable resistor, the A/D converter and the central processing unit are sequentially connected with a voltage-stabilized power supply in series; the voltage measuring circuit and the current measuring circuit are connected with the test variable resistor in parallel; in the test circuit, the winding to be tested is connected, the test variable resistor is connected with the winding to be tested in series, the voltage and the current of the test variable resistor are measured, the partial voltage of the winding to be tested is calculated, and the resistance value of the winding to be tested is further measured.
Preferably, the test rheostat comprises a turbine rheostat and an adjusting motor, an output shaft of the adjusting motor is in transmission fit with a turbine of the turbine rheostat and comprises a gear linkage structure, and the adjusting motor is electrically connected with the central processing unit; the display module comprises a liquid crystal display screen and a touch device, the liquid crystal display screen and the touch device are electrically connected through a central processing unit and an A/D converter, a control adjusting instruction is input to the central processing unit through the touch device, the adjusting motor is started to change the resistance value of the turbine rheostat to adjust the electrified current and the partial pressure of the winding to be measured, and therefore the resistance value of the winding to be measured can be calculated for many times, the average value can be obtained, and the measuring error can be reduced.
The voltage measuring circuit comprises a voltage amplifier and a first filter which are connected in parallel; the current measuring circuit comprises a current amplifier and a second filter which are sequentially connected in series; the voltage measuring circuit and the current measuring circuit are used for measuring the voltage and the current of the test variable resistor, so that the voltage of the fixed stabilized voltage supply is used for calculating the partial voltage of the winding to be measured.
Preferably, the regulated power supply comprises a power adapter and a storage battery, wherein the storage battery is connected with mains supply through the power adapter, and an AC/DC converter is arranged in the power adapter and is used for converting mains supply alternating current into direct current for testing the circuit.
Preferably, the surface of the central processing unit is provided with a detection interface and a memory, and the detection interface and the memory are electrically connected through the central processing unit and the A/D converter; the surface of the detection interface is connected with a detection lead, and the detection lead connects the winding to be detected into the test circuit in a bolting or splicing mode.
Example 1:
in the utility model, the adjusting motor is a GA12-N20 speed-reducing stepping motor, and according to the actual working principle, the display module is a touch display screen, and the adjusting motor can be started by inputting a control signal to change the resistance value of the test rheostat;
example 2:
this embodiment does the utility model discloses well test method of winding that awaits measuring, including following step:
firstly, connecting a winding to be tested into a test circuit, and connecting commercial power alternating current through a power adapter;
step two, inputting the resistance value of the test variable resistor in a touch mode of the display moduleR1And recording the corresponding voltage U1And the current I passed;
step three, subtracting the partial voltage U of the test variable resistance from the total voltage U of the voltage-stabilized power supply1And then the resistance R of the winding to be measured is calculated by using the current I2And recording;
step four, repeating step two and step three five times, and calculating the R obtained by five times2The average value R is taken out.
Example 3:
it should be further explained that the central processing unit of the present invention is provided with a resistance calculation program, and the working principle thereof is:
firstly, according to the resistance R of the set test varistor1Using the partial pressure U obtained by measurement1And the current I passed through, by the formula
Calculating to obtain the resistance value of the winding to be measured;
second part, resistance U of varistor by changing test1Calculating the resistance R of multiple groups of windings to be measured2And the average value R is found by a calculation program.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. The utility model provides a direct current resistance test circuit, includes display module, constant voltage power supply, voltage measurement circuit, current measurement circuit, experimental varistor, AD converter and central processing unit, its characterized in that: the display module, the test variable resistor, the A/D converter and the central processing unit are sequentially connected with a voltage-stabilized power supply in series; and the voltage measuring circuit and the current measuring circuit are both connected with the test variable resistor in parallel.
2. The direct current resistance test circuit according to claim 1, wherein the test varistor comprises a turbine varistor and an adjusting motor, an output shaft of the adjusting motor is in transmission fit with a turbine of the turbine varistor, and the adjusting motor is electrically connected with the central processing unit.
3. The DC resistance testing circuit of claim 2, wherein the display module comprises a liquid crystal display and a touch device, and the liquid crystal display and the touch device are electrically connected through a central processing unit and an A/D converter.
4. A dc resistance test circuit according to claim 3, wherein the voltage measuring circuit comprises a voltage amplifier and a first filter, both of which are connected in parallel.
5. The DC resistance test circuit according to claim 4, wherein the current measurement circuit comprises a current amplifier and a second filter, which are connected in series.
6. The DC resistance test circuit according to claim 5, wherein the regulated power supply comprises a power adapter and a storage battery, and the storage battery is connected with the commercial power through the power adapter.
7. The direct current resistance test circuit according to claim 6, wherein a detection interface and a memory are arranged on the surface of the central processing unit, and the detection interface and the memory are electrically connected through the central processing unit and the A/D converter; and the surface of the detection interface is connected with a detection lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121061013.1U CN214845493U (en) | 2021-05-18 | 2021-05-18 | Direct current resistance test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121061013.1U CN214845493U (en) | 2021-05-18 | 2021-05-18 | Direct current resistance test circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214845493U true CN214845493U (en) | 2021-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121061013.1U Active CN214845493U (en) | 2021-05-18 | 2021-05-18 | Direct current resistance test circuit |
Country Status (1)
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|---|---|
| CN (1) | CN214845493U (en) |
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2021
- 2021-05-18 CN CN202121061013.1U patent/CN214845493U/en active Active
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