CN219695294U - Resistance measuring device with tapping winding for three-phase dry-type transformer - Google Patents
Resistance measuring device with tapping winding for three-phase dry-type transformer Download PDFInfo
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- CN219695294U CN219695294U CN202321073416.7U CN202321073416U CN219695294U CN 219695294 U CN219695294 U CN 219695294U CN 202321073416 U CN202321073416 U CN 202321073416U CN 219695294 U CN219695294 U CN 219695294U
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- 238000004804 winding Methods 0.000 title claims abstract description 162
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 89
- 238000005259 measurement Methods 0.000 claims abstract description 29
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- 230000004907 flux Effects 0.000 description 5
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Abstract
The utility model discloses a resistance measuring device with tapping windings for a three-phase dry-type transformer, which relates to the technical field of resistance measurement of dry-type transformers and comprises the following components: a constant current source, a plurality of identical voltage measuring devices and a plurality of identical line switches; any one-phase winding component of the three-phase dry-type transformer is divided into an upper half coil and a lower half coil; one end of a line switcher is connected with the upper half coil, and the other end of the line switcher is connected with a voltage measuring device; one end of the other line switcher is connected with the lower half coil, and the other end of the other line switcher is connected with the other voltage measuring device; the output end of the constant current source is connected with the head end of the first phase winding, the return end of the constant current source is connected with the lower half coil of the third phase winding, and the three phase windings are connected in series.
Description
Technical Field
The utility model relates to the technical field of resistance measurement of dry transformers, in particular to a resistance measurement device with a tapping winding for a three-phase dry transformer.
Background
The three-phase dry-type transformer winding resistance test is very time-consuming and mainly has two reasons, namely, each phase of the three-phase winding with tapping has 5 combinations of different tapping, and each measurement needs to be subjected to 15 total wiring and disconnecting processes; secondly, the transformer winding is a large inductance, and when a direct current test current is applied, the current in the winding has an exponentially decreasing transition process, the transition process has a time constant τ=l/R, the larger the inductance of the winding is, the smaller the resistance is, the longer the duration of the transition process is, and the longer the time for each measurement is caused.
The existing conventional technology uses a direct current resistance tester to finish the resistance test of a three-phase dry-type transformer with a tapping winding, and has long time consumption and low efficiency.
In the prior art, see patent CN202110888758.3, a zero-flux method is used, on a certain phase of a transformer with a tapping winding, two coils are selected by a line switcher to have the same number of turns and correspond tapping, and the two coils pass through test currents with the same magnitude and opposite directions, and the total magnetic flux in the transformer core is zero, so that the transient process is eliminated, and the time of single measurement is greatly reduced; in this way, only 3 measurements are needed to calculate the winding resistances for the 5 non-tap combinations. Moreover, by adopting the line switcher realized by the relay group, the automatic control of measurement switching can be realized, and the measurement of all tapping of one-phase winding can be realized by one-time wiring.
Disclosure of Invention
The utility model aims to provide a resistance measuring device with a tapping winding for a three-phase dry-type transformer, which realizes the rapid test of all tapping combined resistances of the tapping winding of the three-phase dry-type transformer by one-time wiring through the change of a control circuit of a line switcher.
In order to achieve the above object, the present utility model provides the following solutions:
the utility model provides a resistance measuring device with tapping windings for a three-phase dry-type transformer, which is applied to the three-phase dry-type transformer and comprises: a constant current source, a plurality of identical voltage measuring devices and a plurality of identical line switches;
the three-phase dry-type transformer comprises three-phase windings which are the same and are divided into a first phase winding, a second phase winding and a third phase winding; any one-phase winding component of the three-phase dry-type transformer is divided into an upper half coil and a lower half coil; one end of the upper half coil is the head end of the winding, and one end of the lower half coil is the tail end of the winding;
one end of the line switcher is used for being connected with the other end of the upper half coil, the other end of the line switcher is used for being connected with one end of the voltage measuring device, and the other end of the voltage measuring device is used for being connected with the head end of the winding;
one end of the other line switcher is used for being connected with the other end of the lower half coil, the other end of the other line switcher is used for being connected with one end of the other voltage measuring device, and the other end of the other voltage measuring device is used for being connected with the tail end of the winding;
the output end of the constant current source is connected with the head end of the first phase winding, and the return end of the constant current source is connected with the lower half coil of the third phase winding; the lower half coil of the first phase winding is connected with the head end of the second phase winding in series, and the lower half coil of the second phase winding is connected with the head end of the third phase winding in series.
Optionally, any one phase winding of the three-phase dry-type transformer has six tapping points, including: a first tap point, a second tap point, a third tap point, a fourth tap point, a fifth tap point, and a sixth tap point;
the number of coil turns between the first tap point and the head end of the winding is equal to the number of coil turns between the second tap point and the tail end of the winding; the number of turns of the coil between the third tapping point and the head end of the winding is equal to the number of turns of the coil between the fourth tapping point and the tail end of the winding; the number of turns of the coil between the fifth tap point and the head end of the winding is equal to the number of turns of the coil between the sixth tap point and the tail end of the winding.
Optionally, any one of the line switches includes three relay switches, and the line switch located in the upper half coil includes: a first relay switch, a second relay switch, and a third relay switch;
one end of the first relay switch is connected with the first tapping point, and the other end of the first relay switch is connected with the voltage measuring device; one end of the second relay switch is connected with the third tapping point, and the other end of the second relay switch is connected with the voltage measuring device; one end of the third relay switch is connected with the fifth tapping point, and the other end of the third relay switch is connected with the voltage measuring device.
Optionally, the line switcher located at the lower half coil includes: a fourth relay switch, a fifth relay switch, and a sixth relay switch;
one end of the fourth relay switch is connected with the second tapping point, and the other end of the fourth relay switch is connected with the voltage measuring device; one end of the fifth relay switch is connected with the fourth tapping point, and the other end of the fifth relay switch is connected with the voltage measuring device; one end of the sixth relay switch is connected with the sixth tapping point, and the other end of the sixth relay switch is connected with the voltage measuring device.
Optionally, the resistance measuring device with tapping windings for the three-phase dry-type transformer further comprises: measuring wiring;
a fourth relay switch, a fifth relay switch and a sixth relay switch in the lower half coil of the first phase winding are respectively connected with the head end of the second phase winding through the measuring wiring; and a fourth relay switch, a fifth relay switch and a sixth relay switch in the lower half coil of the second phase winding are respectively connected with the head end of the third phase winding through the measuring wiring.
Optionally, the first relay switch is connected with the second relay switch through the measurement wiring; the second relay switch is connected with the third relay switch through the measurement wiring; the third relay switch is connected with the tail end of the winding through the measuring wiring.
According to the specific embodiment provided by the utility model, the utility model discloses the following technical effects:
the utility model provides a resistance measuring device with tapping windings for a three-phase dry-type transformer, which comprises: a constant current source, a plurality of identical voltage measuring devices and a plurality of identical line switches; in the three-phase dry-type transformer, the upper half coil and the lower half coil of each phase winding are connected into the coil turns in the voltage measuring device through the plurality of line switches, so that the voltage measuring device can measure winding voltages with different turns, the quick test of all tapping combined resistors of the three-phase dry-type transformer can be completed through one-time wiring, and the measuring efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a three-phase dry-type transformer with a tapped winding of a resistance measuring device according to the present utility model;
fig. 2 is a schematic structural diagram of a resistance measuring device with tapping windings for a three-phase dry-type transformer according to the present utility model.
Symbol description:
the constant current source comprises a constant current source-1, an output end-11 of the constant current source, a return end-12 of the constant current source, a voltage measuring device-2, a first voltage measuring device-21, a second voltage measuring device-22, a third voltage measuring device-23, a fourth voltage measuring device-24, a fifth voltage measuring device-25, a sixth voltage measuring device-26, a line switcher-3, a first relay switch-31, a second relay switch-32, a third relay switch-33, a fourth relay switch-34, a fifth relay switch-35, a sixth relay switch-36, a first phase winding-4, a second phase winding-5, a third phase winding-6, an upper half coil-7, a head end-71 of the winding, a lower half coil-8, a tail end-81 of the winding, a first tapping point-9, a second tapping point-10, a third tapping point-11, a fourth tapping point-12, a fifth tapping point-13, a sixth tapping point-14 and a measuring wire-15.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The utility model aims to provide a resistance measuring device with a tapping winding for a three-phase dry-type transformer, which realizes the rapid test of all tapping combined resistances of the tapping winding of the three-phase dry-type transformer by one-time wiring through the change of a control circuit of a line switcher.
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1 and 2, a resistance measurement device with a tapping winding for a three-phase dry-type transformer according to an embodiment of the present utility model includes: a constant current source 1, a plurality of identical voltage measuring devices 2 and a plurality of identical line switches 3.
Specifically, the three-phase dry-type transformer comprises three-phase identical windings, which are divided into a first phase winding 4, a second phase winding 5 and a third phase winding 6; any one-phase winding component of the three-phase dry-type transformer is divided into an upper half coil 7 and a lower half coil 8; one end of the upper half coil is the head end 71 of the winding, and one end of the lower half coil is the tail end 81 of the winding.
One end of one line switcher 3 is for connection with the other end of the upper half coil 7, the other end of one line switcher 3 is for connection with one end of one voltage measuring device 2, and the other end of one voltage measuring device 2 is for connection with the head end 71 of the winding.
One end of the other line switcher 3 is for connection with the other end of the lower half coil 8, the other end of the other line switcher 3 is for connection with one end of the other voltage measuring device 2, and the other end of the other voltage measuring device 2 is for connection with the end 81 of the winding.
The output end 11 of the constant current source is used for being connected with the head end of the first phase winding, and the return end 12 of the constant current source is used for being connected with the lower half coil of the third phase winding; the tail end of the first phase winding is connected with the head end of the second phase winding in series, and the lower half coil of the second phase winding is connected with the head end of the third phase winding in series.
The measuring and controlling device is mainly composed of a control circuit, a constant current source circuit and a voltage acquisition circuit; the control circuit outputs a control signal to the line switcher 3 through the IO port, so that the switching control of each relay group in the line switcher 3 is realized; the control circuit also controls the current output of the constant current source circuit and the voltage signal acquisition of the voltage acquisition circuit to finish the measurement and calculation of the resistance; the constant current source circuit consists of a variable constant current source 1 and can output direct current with a required size under the control of the control circuit; the voltage acquisition circuit comprises six voltage measurement devices and can complete the acquisition of six voltage signals at the same time; the constant current source circuit and the voltage acquisition circuit are connected with the line switcher 3 to realize the output of the measured current and the acquisition of the voltage signal; the line switcher 3 is composed of a relay group, is controlled by a switch of the relay group, and is connected with a winding of a transformer to be measured through a measuring wiring, so that a current loop and a voltage loop required by measurement are established.
Further, any one phase winding of the three-phase dry-type transformer has six tapping points, including: a first tapping point 9, a second tapping point 10, a third tapping point 11, a fourth tapping point 12, a fifth tapping point 13 and a sixth tapping point 14. The number of turns of the coil between the first tapping point 9 and the head end 71 of the winding is equal to the number of turns of the coil between the second tapping point 10 and the end 81 of the winding; the number of turns of the coil between the third tapping point 11 and the head end 71 of the winding is equal to the number of turns of the coil between the fourth tapping point 12 and the end 81 of the winding; the number of turns of the coil between the fifth tapping point 13 and the head end 71 of the winding is equal to the number of turns of the coil between the sixth tapping point 14 and the end 81 of the winding.
When current is introduced, the current flows in from the head end of the upper half coil 7, flows out from a selected tapping point of the upper half coil 7, then flows in from the tail end of the lower half coil 8, and flows out from the corresponding tapping point of the lower half coil 8, so that the current flow directions in the upper half coil 7 and the lower half coil 8 are opposite, the magnetic fluxes formed by the current in the upper half coil 7 and the lower half coil 8 are equal in magnitude and opposite in direction, the magnetic fluxes are offset in the iron core, and the net magnetic flux generated in the iron core is zero all the time, namely zero magnetic flux.
In addition, any one of the line switches 3 includes three relay switches, and the line switch 3 located in the upper half coil 7 includes: a first relay switch 31, a second relay switch 32, and a third relay switch 33. One end of the first relay switch 31 is connected with the first tapping point 9, and the other end of the first relay switch 31 is connected with the voltage measuring device 2; one end of the second relay switch 32 is connected with the third tapping point 11, and the other end of the second relay switch 32 is connected with the voltage measuring device 2; one end of the third relay switch 33 is connected to the fifth tapping point 13, and the other end of the third relay switch 33 is connected to the voltage measuring device 2.
The line switcher 3 located in the lower half coil 8 includes: a fourth relay switch 34, a fifth relay switch 35, and a sixth relay switch 36; one end of the fourth relay switch 34 is connected with the second tapping point 10, and the other end of the fourth relay switch 34 is connected with the voltage measuring device 2; one end of the fifth relay switch 35 is connected with the fourth tapping point 12, and the other end of the fifth relay switch 35 is connected with the voltage measuring device 2; one end of the sixth relay switch 36 is connected to the sixth tapping point 14, and the other end of the sixth relay switch 36 is connected to the voltage measuring device 2.
Further, the resistance measuring apparatus further includes: a measuring wiring 15, one end of the measuring wiring 15 is connected with the line switcher 3, and the other end of the measuring wiring 15 is connected with a measured transformer winding; the measuring connection 15 is divided into three paths, each path is respectively connected with each phase winding of the three-phase transformer, each path is composed of a head end connection wire, a tail end connection wire and six tapping connection wires, each connection wire comprises a current line and a voltage line, the head end connection wire is connected to the head end 71 of one phase winding of the transformer to be measured, the tail end connection wire is connected to the tail end 81 of the same phase winding, and the six tapping connection wires are respectively connected to six tapping points of the same winding.
Example 1
The specific operation steps of the resistance measuring device with the tapping winding of the three-phase dry-type transformer are as follows:
s1: is connected to the three-phase windings of the three-phase dry-type transformer to be measured by means of measurement connections 15.
S2: the output 11 of the constant current source is connected to the head end of the first phase winding 4 via a measurement connection 15.
S3: the corresponding tapping point of the first phase winding 4 is selected by the line switch 3, constituting a wiring scheme applying the zero-flux principle.
S4: the voltage signals of the upper and lower half coils of the first phase winding 4 are connected to the first and second voltage measuring means 21, 22 of the measuring instrument by means of voltage lines in the measuring connection 15.
S5: the corresponding tapping point in the lower half coil of the first phase winding 4 is connected to the head end of the second phase winding 5 by means of a measuring connection 15.
S6: the corresponding tapping point of the second phase winding 5 is selected by the line switch 3, constituting a wiring scheme applying the zero-flux principle.
S7: the voltage signals of the upper and lower half coils of the second phase winding 5 are connected to the third and fourth voltage measuring means 23, 24 of the measuring instrument by means of voltage lines in the measuring connection 15.
S8: the corresponding tapping point in the lower half coil of the second phase winding 5 is connected to the head end of the third phase winding 6 by means of a measuring connection 15.
S9: the corresponding tapping point of the third phase winding 6 is selected by the line switch 3, constituting a wiring scheme applying the zero-flux principle.
S10: the voltage signals of the upper and lower half coils of the third phase winding 6 are connected to fifth and sixth voltage measuring means 25, 26 of the measuring instrument by means of voltage lines in the measuring connection 15.
S11: the corresponding tapping point in the lower half coil of the third phase winding 6 is connected to the return 12 of the constant current source by means of a measurement connection 15.
S12: and measuring and controlling the output current of the constant current source 1, collecting voltage signals of six voltage measuring devices, and calculating to obtain the resistance values of the upper half coil 7 and the lower half coil 8 correspondingly tapped by each phase winding of the transformer to be measured.
S13: and replacing the corresponding tapping nodes of the three-phase winding, and repeating the steps S2-S12 to obtain the resistance values of the upper half coil 7 and the lower half coil 8 of the corresponding tapping of the three-phase winding of the transformer to be tested.
S14: and (3) obtaining the resistance value of the three-phase winding of the transformer to be measured under all tapping combinations through combination calculation of S13.
Example 2
In this embodiment, the first tap point 9 and the second tap point 10 are switched into a current loop by a relay switch in the line switcher 3, and the resistance value of each winding is measured.
The line switcher 3 connects the output terminal 11 of the constant current source to the head end of the first phase winding 4 of the transformer under test, and connects the return terminal 12 of the constant current source to the second tap point 10 of the lower half coil of the third phase winding 6 of the transformer under test.
The line switcher 3 connects the first tap point 9 of the upper half coil 7 of each phase winding of the three-phase windings to be measured to the winding end of the corresponding lower half coil 8, reversely connecting the upper half coil 7 and the lower half coil 8 into a current loop.
The line switcher 3 connects the second tap point 10 of the lower half coil of the first phase winding 4 to the head end of the second phase winding 5, connects the second tap point 10 of the lower half coil of the second phase winding 5 to the head end of the third phase winding 6, and connects the respective coils of the three phase windings in series into a current loop.
The line switcher 3 connects the first voltage measuring device 21 to the head end of the first phase winding 4 of the transformer to be tested and the first tapping point 9 of the upper half coil of the first phase winding 4; a second voltage measuring device 22 is connected to the end of the first phase winding 4 of the transformer to be measured and to the second tapping point 10 of the lower half coil of the first phase winding 4; a third voltage measuring device 23 is connected to the head end of the second phase winding 5 of the transformer to be measured and the first tapping point 9 of the upper half coil of the second phase winding 5; a fourth voltage measuring device 24 is connected to the end of the second phase winding 5 of the transformer to be measured and to the second tapping point 10 of the lower half coil of the second phase winding 5; a fifth voltage measuring device 25 is connected to the head end of the third phase winding 6 of the transformer to be measured and the first tapping point 9 of the upper half coil of the third phase winding 6; a sixth voltage measuring device 26 is connected to the end of the third phase winding 6 of the transformer under test and to the second tapping point 10 of the lower half coil of the third phase winding 6, establishing a voltage loop.
After the current loop and the voltage loop are established, the constant current source 1 is electrified to output current, voltage signals of six voltage measuring devices are collected, and the resistance values of the upper half coil and the lower half coil of each phase winding of the transformer to be measured corresponding to the tapping point are obtained through voltage and current calculation.
When the measurement of one set of tapping points is completed, the circuit switch 3 is switched to the other set of corresponding tapping points for measurement, and the resistance measurement of all tapping points in the upper part coil 7 and the lower part coil 8 of each phase winding is completed in sequence.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present utility model and the core ideas thereof; also, it is within the scope of the present utility model to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the utility model.
Claims (6)
1. A resistance measurement device with tap windings for a three-phase dry-type transformer, the resistance measurement device being applied to the three-phase dry-type transformer, the resistance measurement device comprising: a constant current source, a plurality of identical voltage measuring devices and a plurality of identical line switches;
the three-phase dry-type transformer comprises three-phase windings which are the same and are divided into a first phase winding, a second phase winding and a third phase winding; any one-phase winding component of the three-phase dry-type transformer is divided into an upper half coil and a lower half coil; one end of the upper half coil is the head end of the winding, and one end of the lower half coil is the tail end of the winding;
one end of the line switcher is used for being connected with the other end of the upper half coil, the other end of the line switcher is used for being connected with one end of the voltage measuring device, and the other end of the voltage measuring device is used for being connected with the head end of the winding;
one end of the other line switcher is used for being connected with the other end of the lower half coil, the other end of the other line switcher is used for being connected with one end of the other voltage measuring device, and the other end of the other voltage measuring device is used for being connected with the tail end of the winding;
the output end of the constant current source is connected with the head end of the first phase winding, and the return end of the constant current source is connected with the lower half coil of the third phase winding; the lower half coil of the first phase winding is connected with the head end of the second phase winding in series, and the lower half coil of the second phase winding is connected with the head end of the third phase winding in series.
2. The resistance measurement device with tap windings for a three-phase dry-type transformer according to claim 1, wherein any one phase winding of the three-phase dry-type transformer has six tap points, comprising: a first tap point, a second tap point, a third tap point, a fourth tap point, a fifth tap point, and a sixth tap point;
the number of coil turns between the first tap point and the head end of the winding is equal to the number of coil turns between the second tap point and the tail end of the winding; the number of turns of the coil between the third tapping point and the head end of the winding is equal to the number of turns of the coil between the fourth tapping point and the tail end of the winding; the number of turns of the coil between the fifth tap point and the head end of the winding is equal to the number of turns of the coil between the sixth tap point and the tail end of the winding.
3. A three-phase dry-type transformer with tap winding resistance measuring apparatus according to claim 2, wherein any one of said line switches comprises three relay switches; the line switcher located at the upper half coil includes: a first relay switch, a second relay switch, and a third relay switch;
one end of the first relay switch is connected with the first tapping point, and the other end of the first relay switch is connected with the voltage measuring device; one end of the second relay switch is connected with the third tapping point, and the other end of the second relay switch is connected with the voltage measuring device; one end of the third relay switch is connected with the fifth tapping point, and the other end of the third relay switch is connected with the voltage measuring device.
4. A resistance measuring device with tap windings for a three-phase dry-type transformer according to claim 3, wherein the line switcher at the lower half coil comprises: a fourth relay switch, a fifth relay switch, and a sixth relay switch;
one end of the fourth relay switch is connected with the second tapping point, and the other end of the fourth relay switch is connected with the voltage measuring device; one end of the fifth relay switch is connected with the fourth tapping point, and the other end of the fifth relay switch is connected with the voltage measuring device; one end of the sixth relay switch is connected with the sixth tapping point, and the other end of the sixth relay switch is connected with the voltage measuring device.
5. The resistance measurement device with tap windings for a three-phase dry-type transformer of claim 4, further comprising: measuring wiring;
a fourth relay switch, a fifth relay switch and a sixth relay switch in the lower half coil of the first phase winding are respectively connected with the head end of the second phase winding through the measuring wiring; and a fourth relay switch, a fifth relay switch and a sixth relay switch in the lower half coil of the second phase winding are respectively connected with the head end of the third phase winding through the measuring wiring.
6. The resistance measurement device with tap windings for a three-phase dry-type transformer of claim 5, wherein the first relay switch is connected to the second relay switch through the measurement connection; the second relay switch is connected with the third relay switch through the measurement wiring; the third relay switch is connected with the tail end of the winding through the measuring wiring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321073416.7U CN219695294U (en) | 2023-05-04 | 2023-05-04 | Resistance measuring device with tapping winding for three-phase dry-type transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321073416.7U CN219695294U (en) | 2023-05-04 | 2023-05-04 | Resistance measuring device with tapping winding for three-phase dry-type transformer |
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| Publication Number | Publication Date |
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| CN219695294U true CN219695294U (en) | 2023-09-15 |
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| CN202321073416.7U Active CN219695294U (en) | 2023-05-04 | 2023-05-04 | Resistance measuring device with tapping winding for three-phase dry-type transformer |
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| CN (1) | CN219695294U (en) |
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- 2023-05-04 CN CN202321073416.7U patent/CN219695294U/en active Active
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