CN211293215U - Self-holding direct current milliammeter for testing polarity of mutual inductor - Google Patents
Self-holding direct current milliammeter for testing polarity of mutual inductor Download PDFInfo
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- CN211293215U CN211293215U CN201922216992.2U CN201922216992U CN211293215U CN 211293215 U CN211293215 U CN 211293215U CN 201922216992 U CN201922216992 U CN 201922216992U CN 211293215 U CN211293215 U CN 211293215U
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- 238000012360 testing method Methods 0.000 title claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 55
- 229910052742 iron Inorganic materials 0.000 claims abstract description 15
- 239000008358 core component Substances 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
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- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
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- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
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Abstract
The utility model discloses a self-sustaining direct current milliammeter for mutual-inductor polarity test, it helps avoiding the interference that traditional milliammeter pointer reciprocating swing caused to testing personnel in mutual-inductor polarity test. The utility model comprises a shell; the shell is formed by buckling a transparent upper cover and a base, and is provided with a direct current measuring device and a self-holding device; the direct current measuring device comprises a pointer, a horseshoe magnet, a coil iron core component, positive and negative wiring piles and a dial plate; the pointer and the dial plate of the direct current measuring device are arranged between the transparent upper cover and the base, the horseshoe-shaped magnet and coil iron core assembly of the direct current measuring device are arranged inside the base, and the positive and negative pole wiring piles of the direct current measuring device are arranged outside the base; the self-holding device comprises an electromagnet, an iron sheet, a battery and a reset switch; the iron sheet of the self-holding device is arranged on the pointer of the current measuring device.
Description
Technical Field
The utility model relates to a transformer polarity test technical field of transformer substation especially relates to a direct current milliammeter device for transformer polarity test.
Background
The transformer is an important device for converting high voltage and large current of a primary loop into secondary voltage and secondary current meeting the use requirements of a measuring instrument, a relay protection device and an automatic device, and a polarity test of the transformer is an important electrical test in engineering installation and debugging and is an important method for detecting whether wiring of the secondary loop is correct.
The direct current method is a main method for testing the polarity of the transformer before the transformer is put into operation in engineering application. The direct current method is characterized in that a mutual inductor is connected with a direct current battery E in series through a switch S, a secondary winding is connected into a traditional direct current milliammeter, the switch S is closed, and when the switch S is closed instantly, forward deflection or reverse deflection of a pointer of the traditional direct current milliammeter is observed to determine that a terminal L1 connected with the positive pole of the battery and a terminal K1 connected with the positive pole of the traditional milliammeter are homopolar terminals or reversed polarity terminals.
In the direct current method, a changing electric field is generated in a loop instantly by closing a switch S so that a pointer of a traditional direct current milliammeter deflects, and when the electric field tends to be stable, the pointer of the traditional direct current milliammeter deflects reversely due to Lenz' S law, and then swings back and forth and tends to zero scale. The pointer of the traditional direct current milliammeter rapidly swings back and forth in a short time, interference is caused to judgment of a test result by a polarity tester of the mutual inductor, and a wrong test conclusion is easily made.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that not enough to among the above-mentioned prior art discloses a self-sustaining direct current milliammeter for mutual-inductor polarity test, and it helps avoiding the interference that traditional milliammeter pointer reciprocating swing caused to the experimenter in the mutual-inductor polarity test.
The utility model provides a technical scheme that its technical problem adopted is: a self-holding direct current milliammeter used for testing the polarity of a mutual inductor comprises a shell; the shell is formed by buckling a transparent upper cover and a base, and is provided with a direct current measuring device and a self-holding device;
the direct current measuring device comprises a pointer, a horseshoe magnet, a coil iron core component, positive and negative wiring piles and a dial plate; the pointer and the dial plate of the direct current measuring device are arranged between the transparent upper cover and the base, the horseshoe-shaped magnet and coil iron core assembly of the direct current measuring device are arranged inside the base, and the positive and negative pole wiring piles of the direct current measuring device are arranged outside the base;
the self-holding device comprises an electromagnet, an iron sheet, a battery and a reset switch; the iron sheet of the self-holding device is arranged on the pointer of the current measuring device, the electromagnet of the self-holding device is arranged on the lower portion of the dial plate of the direct current measuring device, the battery of the self-holding device is arranged inside the base, and the reset switch of the self-holding device is arranged outside the base.
As a preferred embodiment of the present invention: the direct current measuring device adopts a pointer and a dial plate to display numerical values, the coil iron core component is formed by winding a coil made of conducting wires on an iron core capable of rotating around a shaft, the pointer is connected to the rotatable iron core through a flat spiral spring, two ends of the coil are respectively connected to a rotating shaft of the rotatable iron core through the flat spiral spring, and the positive and negative wiring piles are connected with the coil through the conducting wires and springs; two poles of the horseshoe-shaped magnet are respectively provided with a pole shoe with a cylindrical inner wall.
As a preferred embodiment of the present invention: in the self-holding device, an electromagnet, a battery and a reset switch are connected in series through a lead, and the battery is a detachable and replaceable battery; the reset switch is an electric normally closed contact, the switch loop is pressed down to be disconnected, and the switch loop is loosened to be closed.
As a preferred embodiment of the present invention: the mutual inductor is connected with a direct current battery in series through a switch, a secondary winding of the mutual inductor is connected with positive and negative wiring piles K1 and K2, and at the moment of closing the switch, a pointer with an iron sheet deflects to a magnetic field range of an electromagnet of the self-holding device and is attracted by the electromagnet under the action of magnetic force to be self-held in the deflection position.
As a preferred embodiment of the present invention: the number of the electromagnets is two, the electromagnets are symmetrically distributed on the left side and the right side of the zero position of the pointer, and the two electromagnets are connected in series.
As a preferred embodiment of the present invention: the base contains the horizontally and controls the platform, positive negative pole wiring stake and reset switch set up control on the platform.
Compared with the prior art, the utility model has the following advantage:
the utility model discloses a self-sustaining direct current milliammeter for mutual-inductor polarity test its electro-magnet accessible magnetic field with the deflection pointer actuation self-sustaining of iron sheet, avoided the pointer shake defect that the traditional testing arrangement appears in the concrete test procedure influence judgement; the utility model discloses a concrete test procedure does: the current passes through a coil and an iron core of the direct current measuring device, the coil iron core generates a magnetic field and interacts with the magnetic field generated by the horseshoe-shaped magnet, the iron core rotating shaft rotates to drive the pointer provided with the iron sheet to rotate, the pointer provided with the iron sheet deflects to the magnetic field range of the electromagnet of the self-holding device, the pointer is attracted by the electromagnet under the action of magnetic force, the self-holding deflection position is realized, and the pointer deflection direction can be simply and quickly judged. After the test, the reset switch is pressed, the electromagnet is powered off, and the pointer is reset. The utility model provides a structural design of basis can be completely according to as to field technical personnel such as the concrete automatically controlled process of magnetic field intensity the utility model discloses a direction and description, the direct doubtful completion electro-magnet specification that accomplishes, the definite detail circuit equipment of size position and whole scheme.
Drawings
Fig. 1 is a perspective view of a self-holding direct current milliammeter for testing the polarity of a transformer according to the present invention;
FIG. 2 is a wiring diagram of a testing method according to an embodiment of the present invention;
fig. 3 is the utility model provides a self-sustaining device's wiring schematic diagram for self-sustaining direct current milliammeter of mutual-inductor polarity test.
Description of reference numerals:
11-transparent upper cover, 12-base; 21-pointer, 22-horseshoe magnet, 23-iron core, 24-positive and negative wiring piles, and 25-dial plate; 31-electromagnet, 32-iron sheet, 33-battery, 34-reset switch;
in fig. 2, E is a battery, S is a switch, L1 and L2 are terminals to which the positive and negative poles of the primary side of the transformer are connected, and K1 and K2 are terminals to which the positive and negative poles of the secondary side of the transformer are connected; PA is an ammeter.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
As shown in fig. 1 to 3, which show a specific embodiment of the present invention; the values "0", "10" and "20" on the dial in fig. 1 are scale values, which are very common in the art, and can be clearly distinguished from the reference numerals; as shown in fig. 1, a self-holding direct current milliammeter for testing the polarity of a transformer comprises: a shell buckled by a transparent upper cover 11 and a base 12, wherein a direct current measuring device and a self-holding device are arranged in the shell;
the current measuring device comprises a pointer 21, a horseshoe-shaped magnet 22, a coil iron core component, positive and negative wiring piles 24 and a dial 25; a pointer 21 and a dial 25 of the current measuring device are arranged between the transparent upper cover 11 and the base 12, a horseshoe-shaped magnet 22 and a coil iron core assembly of the current measuring device are arranged inside the base, and a positive and negative pole wiring pile 24 of the current measuring device is arranged outside the base 12;
the self-holding device comprises an electromagnet 31, an iron sheet 32, a battery 33 and a reset switch 34; the iron sheet 32 of the self-holding device is arranged on the pointer 21 of the current measuring device, the electromagnet 31 of the self-holding device is arranged at the lower part of the dial 25 of the current measuring device, the battery 33 of the self-holding device is arranged inside the base 12, and the reset switch 34 of the self-holding device is arranged outside the base 12. The connection of the self-retaining device can be seen visually from the dashed line in fig. 1; the dashed lines of fig. 1 are the circuit connections inside the base in the self-retaining device;
in the embodiment of the present invention, as shown in the figure: current measuring device adopts pointer 21 and dial plate 25 to show numerical value, coil iron core subassembly is coiled on one can pivoting iron core 23 by the coil that the wire was made and constitutes, pointer 21 connects on rotatable iron core 23 through the coil spring of flat piece (being the cross section promptly for the coil spring of rectangle, also called slice coil spring), the both ends of coil are connected in rotatable iron core 23's pivot through the coil spring of flat piece respectively, positive negative pole wiring stake 24 passes through wire and spring coupling the coil. Two poles of the horseshoe-shaped magnet 22 are respectively provided with a pole shoe with a cylindrical inner wall. The iron core is arranged between the two pole shoes; after the power is switched on, the magnetism of the horseshoe and the magnetic field of the iron core interact, and the iron core rotates to drive the pointer to rotate.
In the specific embodiment of the utility model, among the self-sustaining device, electro-magnet 31, battery 33, reset switch 34 pass through the wire and establish ties, battery 33 is for dismantling the ordinary battery of change, reset switch 34 is electronic normally closed contact, presses the switch circuit disconnection promptly, and it is closed to loosen the switch circuit.
As shown in fig. 2, the utility model discloses during specific wiring, concatenate a direct current battery E with the mutual-inductor through switch S, secondary winding inserts positive negative pole wiring stake K1, K2, closed switch S, in the twinkling of an eye when closed switch S, there is iron sheet 32' S pointer 21 to deflect to the magnetic field scope of self-sustaining device electro-magnet 31, receive the magnetic force effect by the electro-magnet actuation, self-sustaining deflection position, observe pointer 21 forward deflection and confirm that battery positive pole connects terminal L1 and the anodal stake K1 that connects of milliammeter are homopolar terminal.
As shown in fig. 3, when the reset switch 34 is pressed after the test is finished, the electromagnet 31 is deenergized, and the pointer 21 is reset.
The basic principles and essential features of the invention and the invention have been shown and described above with the understanding that those skilled in the art will understand that the invention is not limited by the above-described embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed, which is defined by the appended claims and their equivalents.
Claims (6)
1. A self-sustaining direct current milliammeter for mutual-inductor polarity test which characterized in that: comprises a shell; the shell is formed by buckling a transparent upper cover and a base, and is provided with a direct current measuring device and a self-holding device;
the direct current measuring device comprises a pointer, a horseshoe magnet, a coil iron core component, positive and negative wiring piles and a dial plate; the pointer and the dial plate of the direct current measuring device are arranged between the transparent upper cover and the base, the horseshoe-shaped magnet and coil iron core assembly of the direct current measuring device are arranged inside the base, and the positive and negative pole wiring piles of the direct current measuring device are arranged outside the base;
the self-holding device comprises an electromagnet, an iron sheet, a battery and a reset switch; the iron sheet of the self-holding device is arranged on the pointer of the current measuring device, the electromagnet of the self-holding device is arranged on the lower portion of the dial plate of the direct current measuring device, the battery of the self-holding device is arranged inside the base, and the reset switch of the self-holding device is arranged outside the base.
2. The self-sustaining direct current milliammeter for polarity testing of transformers of claim 1, further comprising: the direct current measuring device adopts a pointer and a dial plate to display numerical values, the coil iron core component is formed by winding a coil made of conducting wires on an iron core capable of rotating around a shaft, the pointer is connected to the rotatable iron core through a flat spiral spring, two ends of the coil are respectively connected to a rotating shaft of the rotatable iron core through the flat spiral spring, and the positive and negative wiring piles are connected with the coil through the conducting wires and springs; two poles of the horseshoe-shaped magnet are respectively provided with a pole shoe with a cylindrical inner wall.
3. A self-sustaining direct current milliammeter for testing the polarity of a transformer as claimed in claim 1 or 2, wherein: in the self-holding device, an electromagnet, a battery and a reset switch are connected in series through a lead, and the battery is a detachable and replaceable battery; the reset switch is an electric normally closed contact, the switch loop is pressed down to be disconnected, and the switch loop is loosened to be closed.
4. The self-sustaining direct current milliammeter for polarity testing of transformers of claim 1, further comprising: the mutual inductor is connected with a direct current battery in series through a switch, a secondary winding of the mutual inductor is connected with positive and negative wiring piles K1 and K2, and at the moment of closing the switch, a pointer with an iron sheet deflects to a magnetic field range of an electromagnet of the self-holding device and is attracted by the electromagnet under the action of magnetic force to be self-held in the deflection position.
5. The self-sustaining direct current milliammeter for polarity testing of transformers of claim 1, further comprising: the number of the electromagnets is two, the electromagnets are symmetrically distributed on the left side and the right side of the zero position of the pointer, and the two electromagnets are connected in series.
6. The self-sustaining direct current milliammeter for polarity testing of transformers of claim 1, further comprising: the base contains the horizontally and controls the platform, positive negative pole wiring stake and reset switch set up control on the platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922216992.2U CN211293215U (en) | 2019-12-11 | 2019-12-11 | Self-holding direct current milliammeter for testing polarity of mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922216992.2U CN211293215U (en) | 2019-12-11 | 2019-12-11 | Self-holding direct current milliammeter for testing polarity of mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211293215U true CN211293215U (en) | 2020-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922216992.2U Active CN211293215U (en) | 2019-12-11 | 2019-12-11 | Self-holding direct current milliammeter for testing polarity of mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211293215U (en) |
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2019
- 2019-12-11 CN CN201922216992.2U patent/CN211293215U/en active Active
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