CN113391131B - Resistance testing device and method for dry-type transformer tapping winding - Google Patents
Resistance testing device and method for dry-type transformer tapping winding Download PDFInfo
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- CN113391131B CN113391131B CN202110888758.3A CN202110888758A CN113391131B CN 113391131 B CN113391131 B CN 113391131B CN 202110888758 A CN202110888758 A CN 202110888758A CN 113391131 B CN113391131 B CN 113391131B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
Abstract
The invention relates to a resistance testing device and method for a tapping winding of a dry-type transformer, which relate to the technical field of electrical measurement and comprise a direct current source and a first voltage measuring device. One end of the direct current source is used for connecting the head end of the first coil winding when the resistance of the first coil winding is detected; the first voltage measuring device is used for being arranged between the head end of the first coil winding and the first calibration tapping node when the resistance of the first coil winding is detected; the first calibration tapping node is used for being connected with the head end of the second coil winding; the other end of the direct current source is used for connecting a second detection tapping node when the resistance of the first coil winding is detected; and the number of turns of the coil corresponding to the second detection tapping node is the same as that of the coil corresponding to the first calibration tapping node. The invention simplifies the device and the method for testing the resistance of the tapping winding of the dry-type transformer and realizes the rapid test of the tapping winding to be tested.
Description
Technical Field
The invention relates to the technical field of electrical measurement, in particular to a resistance testing device and method for a tapping winding of a dry-type transformer.
Background
The winding resistance test of transformers, especially large-capacity transformers, is very time-consuming, because the transformer winding is a large inductance, and when a dc test current is applied, there is an exponentially decreasing flat transition of the current in the winding, which has a time constant τ ═ L/R. The greater the inductance of the winding, the lower the resistance and the longer the duration of this transition. On large capacity transformers, this transition process can take several to tens of minutes.
In the prior art, the transition process is eliminated by a saturation method or a zero-flux method. The zero flux method is to pass a certain proportion of test current through the primary and secondary windings of the transformer to make the total magnetic flux passing through the iron core of the transformer zero, thereby eliminating the transition process. However, the zero flux method requires not less than two programmable current sources to be respectively connected to the primary winding and the secondary winding of the transformer, and also requires proportional currents to be supplied to the windings according to the connection groups and the voltage ratio, and the wiring and control processes are complicated.
In summary, a device and a method for testing the resistance of the tapped winding of the dry-type transformer are needed, which apply a zero-flux method to eliminate the transition process, simplify the device and the testing steps, and realize the rapid testing of the resistance of the tapped winding to be tested.
Disclosure of Invention
The invention aims to provide a resistance testing device and a resistance testing method for a tapping winding of a dry-type transformer, which eliminate a transition process by generating magnetic fluxes with equal magnitude and opposite directions, simplify the testing device and steps and further quickly test the resistance of the winding.
In order to achieve the purpose, the invention provides the following scheme:
a resistance testing device for a tapping winding of a dry-type transformer comprises a direct current source and a first voltage measuring device;
one end of the direct current source is used for connecting the head end of the first coil winding when the resistance of the first coil winding is detected; the first coil winding further comprises a tail end, and a plurality of first tapping nodes are arranged at the tail end of the first coil winding;
the first voltage measuring device is configured to:
when the resistance of the first coil winding is detected, the resistance is arranged between the head end of the first coil winding and a first calibration tapping node; the first calibration tapping node is any one first tapping node of the first coil winding; the first calibration tapping node is used for being connected with the head end of the second coil winding;
the other end of the direct current source is used for connecting a second detection tapping node when the resistance of the first coil winding is detected; the second coil winding further comprises a tail end; a plurality of second connection nodes are arranged at the tail end of the second coil winding; the second detection tapping node is any one second tapping node of the second coil winding; and the number of turns of the coil corresponding to the second detection tapping node is the same as that of the coil corresponding to the first calibration tapping node.
In order to achieve the purpose, the invention provides the following scheme:
a resistance testing device for a dry-type transformer tapping winding comprises a direct current source and a first voltage measuring device;
one end of the direct current source is used for connecting a second calibration tapping node when the resistance of the second coil winding is detected; the second coil winding comprises a head end and a tail end, and the tail end of the second coil winding is provided with a plurality of second connection nodes; the second calibration tapping node is any one second tapping node of the second coil winding;
the first voltage measuring device is used for being arranged between the head end of the second coil winding and the second calibration tapping node when the resistance of the second coil winding is detected;
the head end of the second coil winding is used for being connected with a first detection tapping node of the first coil winding; the first coil winding comprises a head end and a tail end, and the tail end of the first coil winding is provided with a plurality of first tapping nodes; the first detection tapping node is any one first tapping node of the first coil winding; the number of turns of the coil corresponding to the first detection tapping node is the same as that of the coil corresponding to the second calibration tapping node;
and the other end of the direct current source is used for connecting the head end of the first coil winding when the resistance of the second coil winding is detected.
In order to achieve the purpose, the invention provides the following scheme:
a resistance testing device for a tapping winding of a dry-type transformer comprises a direct current source, a first voltage measuring device and a second voltage measuring device;
one end of the direct current source is used for being connected with the head end of the first coil winding; the first coil winding further comprises a tail end, and a plurality of first tapping nodes are arranged at the tail end of the first coil winding;
the first voltage measuring device is arranged between the head end of the first coil winding and a first calibration tapping node; the first calibration tapping node is any one first tapping node of the first coil winding; the first calibration tapping node is used for being connected with the head end of the second coil winding;
the other end of the direct current source is used for connecting a second calibration tapping node; the second coil winding also comprises a tail end; a plurality of second connection nodes are arranged at the tail end of the second coil winding; the second calibration tapping node is any one second tapping node of the second coil winding; the number of turns of the coil corresponding to the second calibration tapping node is the same as that of the coil corresponding to the first calibration tapping node;
the second voltage measuring device is arranged between the head end of the second coil winding and the second calibration tapping node.
Optionally, the resistance testing device further comprises a first line switch and a second line switch;
the first line switcher is arranged on the first coil winding and used for selecting the first calibration tapping node;
the second line switch is disposed on the second coil winding, the second line switch for selecting the second detection tap node.
Optionally, the number of the first tapping nodes is the same as the number of the second tapping nodes.
Optionally, the number of the first tapping nodes is 3; the number of the second tapping nodes is 3.
In order to achieve the purpose, the invention provides the following scheme:
a resistance testing method applied to a first coil winding of a resistance testing apparatus, comprising:
determining a first calibration tapping node and a second detection tapping node;
one end of a direct current source is connected with the head end of the first coil winding, a first calibration tapping node of the first coil winding is connected with the head end of the second coil winding, a second detection tapping node of the second coil winding is connected with the other end of the direct current source, and a first voltage measuring device is arranged between the head end of the first coil winding and the first calibration tapping node;
obtaining a first current through the direct current source;
measuring a first voltage corresponding to the first calibration tapping node according to the first voltage measuring device;
and calculating a first resistance of the first coil winding corresponding to the first calibration tapping node according to the first current and the first voltage.
In order to achieve the purpose, the invention provides the following scheme:
a resistance testing method applied to a second coil winding of a resistance testing device comprises the following steps:
determining a second calibration tapping node and a first detection tapping node;
one end of the direct current source is connected with a second calibration tapping node of the second coil winding, the head end of the second coil winding is connected with a first detection tapping node of the first coil winding, the head end of the first coil winding is connected with the other end of the direct current source, and the first voltage measuring device is arranged between the head end of the second coil winding and the second calibration tapping node;
acquiring a second current through the direct current source;
measuring a second voltage corresponding to the second calibration tapping node according to the first voltage measuring device;
and calculating a second resistance of the second coil corresponding to the second calibration tapping node according to the second current and the second voltage.
In order to achieve the purpose, the invention provides the following scheme:
a resistance testing method applied to a resistance testing device comprises the following steps:
determining a first calibration tapping node and a second calibration tapping node;
one end of a direct current source is connected with the head end of the first coil winding, a first calibration tapping node of the first coil winding is connected with the head end of the second coil winding, a second calibration tapping node of the second coil winding is connected with the other end of the direct current source, a first voltage measuring device is arranged between the head end of the first coil winding and the first calibration tapping node, and a second voltage measuring device is arranged between the head end of the second coil winding and the second calibration tapping node;
obtaining a third current through the direct current source;
measuring a third voltage corresponding to the first calibration tapping node according to the first voltage measuring device, and measuring a fourth voltage corresponding to the second calibration tapping node according to the second voltage measuring device;
and calculating a third resistance of the first coil winding corresponding to the first calibration tapping node according to the third current and the third voltage, and calculating a fourth resistance of the second coil winding corresponding to the second calibration tapping node according to the third current and the fourth voltage.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
when the resistance of the first coil winding is detected, one end of a direct current source is connected with the head end of the first coil winding, a plurality of first tapping nodes are arranged at the tail end of the first coil winding, the first calibration tapping node is any one first tapping node, and a first voltage measuring device is arranged between the first calibration tapping node and the head end of the first coil winding; the other end of the direct current source is connected with a second detection tapping node of the second coil winding, and the first calibration tapping node is connected with the head end of the second coil winding. According to the resistance testing device for the tapping windings of the dry-type transformer, which is formed by connection, as the number of turns of the coil corresponding to the second detection tapping node is the same as that of the coil corresponding to the first calibration tapping node, magnetic fluxes with equal magnitude and opposite directions can be generated in the first coil winding and the second coil winding to eliminate the transition process; moreover, the resistance testing device with the above structure is simple in device and convenient to operate, and can realize quick testing of winding resistance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described 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 to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a resistance testing device for a tapping winding of a dry-type transformer according to the present invention;
fig. 2 is a schematic flow chart of a resistance testing method for a first coil winding of a tap winding of a dry-type transformer according to the present invention;
FIG. 3 is a schematic flow chart of a resistance testing method for a second coil winding of a tap winding of a dry-type transformer according to the present invention;
fig. 4 is a schematic flow chart of the resistance testing method for the tapping winding of the dry-type transformer according to the present invention.
Description of the symbols:
1-a direct current source, 2-a first coil winding, 3-a first voltage measuring device, 4-a second voltage measuring device, 5-a second coil winding.
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.
The invention aims to provide a resistance testing device and method for a tapping winding of a dry-type transformer, which can eliminate a transition process so as to quickly test the resistance of the winding.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Example one
As shown in fig. 1, the present embodiment provides a resistance testing apparatus for a tap winding of a dry-type transformer, which includes a dc current source 1 and a first voltage measuring device 3; one end of the direct current source 1 is used for connecting the head end of the first coil winding 2 when detecting the resistance of the first coil winding 2; the first coil winding 2 further includes a tail end, and a plurality of first tapping nodes, such as tapping node a, tapping node c, and tapping node e, are disposed at the tail end of the first coil winding 2.
The first voltage measuring device 3 is configured to: when the resistance of the first coil winding 2 is detected, the resistance is set between the head end of the first coil winding 2 and a first calibration tapping node; the first calibration tapping node is any one first tapping node of the first coil winding 2; the first calibration tapping node is used for being connected with the head end of the second coil winding 5.
The other end of the direct current source 1 is used for connecting a second detection tapping node when detecting the resistance of the first coil winding 2. The second coil winding 5 further comprises a tail end; a plurality of second tapping nodes, such as tapping node b, tapping node d and tapping node f shown in the figure, are arranged at the tail end of the second coil winding 5; the second detection tap node is any one of the second tap nodes of the second coil winding 5.
And the number of turns of the coil corresponding to the second detection tapping node is the same as that of the coil corresponding to the first calibration tapping node. Specifically, when the first calibration tapping node is the tapping node a, the second detection tapping node is the tapping node b; when the first calibration tapping node is a tapping node c, the second detection tapping node is a tapping node d; and when the first calibration tapping node is the tapping node e, the second detection tapping node is the tapping node f.
Example two
The embodiment provides a resistance testing device for a tapping winding of a dry-type transformer, which comprises a direct current source 1 and a first voltage measuring device 3; one end of the direct current source 1 is used for connecting a second calibration tapping node when the resistance of the second coil winding 5 is detected; the second coil winding 5 comprises a head end and a tail end, and a plurality of second tapping nodes are arranged at the tail end of the second coil winding 5, specifically, the plurality of second tapping nodes comprise a tapping node b, a tapping node d and a tapping node f; the second calibration tapping node is any one second tapping node of the second coil winding 5.
The first voltage measuring device 3 is configured to be arranged between the head end of the second coil winding 5 and the second calibration tapping node when detecting the resistance of the second coil winding 5; the head end of the second coil winding 5 is used for being connected with a first detection tapping node of the first coil winding 2; the first coil winding 2 comprises a head end and a tail end, and the tail end of the first coil winding 2 is provided with a plurality of first tapping nodes, specifically, the plurality of first tapping nodes comprise a tapping node a, a tapping node c and a tapping node e; the first detection tapping node is any one first tapping node of the first coil winding 2.
And the number of turns of the coil corresponding to the first detection tapping node is the same as that of the coil corresponding to the second calibration tapping node. Specifically, when the second calibration tapping node is the tapping node b, the first detection tapping node is the tapping node a; when the second calibration tapping node is the tapping node d, the first detection tapping node is the tapping node c; when the second calibration tapping node is tapping node f, the first detection tapping node is tapping node e.
The other end of the direct current source 1 is used for connecting the head end of the first coil winding 2 when detecting the resistance of the second coil winding 5.
EXAMPLE III
As shown in fig. 1, the present embodiment provides a resistance testing apparatus for a tap winding of a dry-type transformer, which includes a dc current source 1, a first voltage measuring device 3, and a second voltage measuring device 4; one end of the direct current source 1 is used for connecting the head end of the first coil winding 2; the first coil winding 2 further includes a tail end, and a plurality of first tapping nodes, such as tapping node a, tapping node c, and tapping node e, are disposed at the tail end of the first coil winding 2.
The first voltage measuring device 3 is arranged between the head end of the first coil winding 2 and a first calibration tapping node; the first calibration tapping node is any one first tapping node of the first coil winding 2; the first calibration tapping node is used for being connected with the head end of the second coil winding 5.
The other end of the direct current source 1 is used for connecting a second calibration tapping node; the second coil winding 5 further comprises a tail end; a plurality of second tapping nodes, such as tapping node b, tapping node d and tapping node f shown in the figure, are arranged at the tail end of the second coil winding 5; the second calibration tapping node is any one second tapping node of the second coil winding 5.
And the number of turns of the coil corresponding to the second calibration tapping node is the same as that of the coil corresponding to the first calibration tapping node. Specifically, when the first calibrated tapping node is the tapping node a, the second calibrated tapping node is the tapping node b; when the first calibration tapping node is the tapping node c, the second calibration tapping node is the tapping node d; when the first calibration tapping node is the tapping node e, the second calibration tapping node is the tapping node f.
The second voltage measuring device 4 is configured to be disposed between a head end of the second coil winding 5 and the second calibration tapping node.
In this embodiment, the resistance testing apparatus further includes a first line switch and a second line switch; the first line switch is arranged on the first coil winding 2 and is used for selecting the first calibration tapping node; the second line switch is provided on the second coil winding 5, and the second line switch is used to select the second detection tap node.
Specifically, the number of the first tapping nodes is the same as the number of the second tapping nodes. In this embodiment, the number of the first tapping nodes is 3; the number of the second connection nodes is 3, wherein the upper half part winding of the dry-type transformer is arranged between the first connection node a, the first connection node c, the first connection node e and the head end of the first coil winding 2, and the lower half part winding of the dry-type transformer is arranged between the second connection node b, the second connection node d, the second connection node f and the head end of the second coil winding 5.
In fig. 1, a connection method of the resistance testing apparatus is specifically shown when the first calibrated tap node is a tap node c and the second calibrated tap node is a tap node d. That is, the head end of the first coil winding 2 is connected to the dc current source 1, the first calibration tapping node (tapping node c) of the first coil winding 2 is connected to the head end of the second coil winding 5, and the second calibration tapping node (tapping node d) of the second coil winding 5 is connected to the other end of the dc current source 1, thereby forming a circuit loop; a first voltage measuring device 3 is arranged between the head end of the first coil winding 2 and the first calibration tapping node, and a second voltage measuring device 4 is arranged between the head end of the second coil winding 5 and the second calibration tapping node, so as to form a voltage measuring and measuring circuit.
When the resistance measurement of a certain group of corresponding tapping nodes (a first calibration tapping node and a second calibration tapping node) is completed, the corresponding tapping nodes are switched to another group for measurement through the line connector, so that the resistance measurement of all the tapping nodes of the same winding coil is completed without changing the measurement wiring. And for the resistances of other tapping nodes which are not correspondingly tapped, the combination of the measurement results of the resistances of the upper half coil and the lower half coil of the corresponding tapping node is used.
Example four
As shown in fig. 2, the present embodiment provides a resistance testing method applied to the first coil winding of the resistance testing apparatus provided in the first embodiment, including:
102, one end of a direct current source 1 is connected to the head end of the first coil winding 2, a first calibration tapping node of the first coil winding 2 is connected to the head end of the second coil winding 5, a second detection tapping node of the second coil winding 5 is connected to the other end of the direct current source 1, and a first voltage measuring device 3 is arranged between the head end of the first coil winding 2 and the first calibration tapping node.
And 104, measuring a first voltage corresponding to the first calibration tapping node according to the first voltage measuring device 3.
And 105, calculating a first resistance of the first coil winding 2 corresponding to the first calibration tapping node according to the first current and the first voltage.
EXAMPLE five
As shown in fig. 3, the present embodiment provides a resistance testing method applied to the second coil winding of the resistance testing apparatus provided in the second embodiment, including:
And 204, measuring a second voltage corresponding to the second calibration tapping node according to the first voltage measuring device 3.
EXAMPLE six
As shown in fig. 4, the present embodiment provides a resistance testing method applied to the resistance testing apparatus provided in embodiment 3, including:
And (3) sequentially replacing the first calibration tapping node and the corresponding second calibration tapping node, and repeating the steps 301-305 to measure the resistance of each tapping node of the dry-type transformer tapping winding.
The resistance testing device of the dry type transformer tapping winding resistance applies a zero magnetic flux principle, when in measurement, the turns of a first coil winding 2 (an upper half coil) and a second coil winding 5 (a lower half coil) of a measured winding are the same, after the first coil winding 2 and the second coil winding 5 are reversely connected in series through a line connector, the flow directions of currents in the first coil winding 2 and the second coil winding 5 are opposite, the magnetic fluxes formed by the coil currents of the first coil winding 2 and the second coil winding 5 are equal in magnitude and opposite in direction, and are mutually offset in an iron core, the net magnetic flux generated inside the iron core is always zero, and the transition process is eliminated.
Compared with the prior art, the invention also has the following advantages:
the invention provides a device and a method for measuring the shunt winding resistance of a dry-type transformer, which do not need high measurement current and have no residual magnetism after measurement. The larger the transformer, the greater the contribution of this solution. Finally, the measurement time is significantly reduced.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the embodiment of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A resistance testing device for a dry-type transformer tapping winding is characterized by comprising a direct current source and a first voltage measuring device;
one end of the direct current source is used for connecting the head end of the first coil winding when the resistance of the first coil winding is detected; the first coil winding further comprises a tail end, and a plurality of first tapping nodes are arranged at the tail end of the first coil winding;
the first voltage measuring device is configured to:
when the resistance of the first coil winding is detected, the resistance is arranged between the head end of the first coil winding and a first calibration tapping node; the first calibration tapping node is any one first tapping node of the first coil winding; the first calibration tapping node is used for being connected with the head end of the second coil winding;
the other end of the direct current source is used for connecting a second detection tapping node when the resistance of the first coil winding is detected; the second coil winding also comprises a tail end; a plurality of second connection nodes are arranged at the tail end of the second coil winding; the second detection tapping node is any one second tapping node of the second coil winding; the number of turns of the coil corresponding to the second detection tapping node is the same as that of the coil corresponding to the first calibration tapping node;
the resistance testing device also comprises a first line switcher and a second line switcher;
the first line switcher is arranged on the first coil winding and used for selecting the first calibration tapping node;
the second line switch is disposed on the second coil winding, the second line switch for selecting the second detection tap node.
2. A resistance testing device for a dry-type transformer tapping winding is characterized by comprising a direct current source and a first voltage measuring device;
one end of the direct current source is used for connecting a second calibration tapping node when the resistance of the second coil winding is detected; the second coil winding comprises a head end and a tail end, and the tail end of the second coil winding is provided with a plurality of second connection nodes; the second calibration tapping node is any one second tapping node of the second coil winding;
the first voltage measuring device is used for being arranged between the head end of the second coil winding and the second calibration tapping node when the resistance of the second coil winding is detected;
the head end of the second coil winding is used for being connected with a first detection tapping node of the first coil winding; the first coil winding comprises a head end and a tail end, and the tail end of the first coil winding is provided with a plurality of first tapping nodes; the first detection tapping node is any one first tapping node of the first coil winding; the number of turns of the coil corresponding to the first detection tapping node is the same as that of the coil corresponding to the second calibration tapping node;
the other end of the direct current source is used for connecting the head end of the first coil winding when the resistance of the second coil winding is detected;
the resistance testing device further comprises a first line switcher and a second line switcher;
the first line switch is disposed on the first coil winding, the first line switch for selecting the first detection tap node;
the second line switch is disposed on the second coil winding, the second line switch being configured to select the second calibration tap node.
3. A resistance testing device of a dry type transformer tapping winding is characterized by comprising a direct current source, a first voltage measuring device and a second voltage measuring device;
one end of the direct current source is used for being connected with the head end of the first coil winding; the first coil winding further comprises a tail end, and a plurality of first tapping nodes are arranged at the tail end of the first coil winding;
the first voltage measuring device is arranged between the head end of the first coil winding and a first calibration tapping node; the first calibration tapping node is any one first tapping node of the first coil winding; the first calibration tapping node is used for being connected with the head end of the second coil winding;
the other end of the direct current source is used for connecting a second calibration tapping node; the second coil winding further comprises a tail end; a plurality of second connection nodes are arranged at the tail end of the second coil winding; the second calibration tapping node is any one second tapping node of the second coil winding; the number of turns of the coil corresponding to the second calibration tapping node is the same as that of the coil corresponding to the first calibration tapping node;
the second voltage measuring device is arranged between the head end of the second coil winding and the second calibration tapping node;
the resistance testing device further comprises a first line switcher and a second line switcher;
the first line switcher is arranged on the first coil winding and used for selecting the first calibration tapping node;
the second line switch is disposed on the second coil winding, the second line switch for selecting the second nominal tap node.
4. Dry-type transformer tap winding resistance test device according to claim 3, characterized in that the number of the first tap nodes is the same as the number of the second tap nodes.
5. The resistance testing device of the dry type transformer tap winding according to claim 3, wherein the number of the first tap nodes is 3; the number of the second tapping nodes is 3.
6. A resistance testing method applied to a resistance testing device of a dry-type transformer tap winding according to claim 1, wherein the resistance testing method comprises the following steps:
determining a first calibration tapping node and a second detection tapping node;
one end of a direct current source is connected with the head end of the first coil winding, a first calibration tapping node of the first coil winding is connected with the head end of the second coil winding, a second detection tapping node of the second coil winding is connected with the other end of the direct current source, and a first voltage measuring device is arranged between the head end of the first coil winding and the first calibration tapping node;
obtaining a first current through the direct current source;
measuring a first voltage corresponding to the first calibration tapping node according to the first voltage measuring device;
and calculating a first resistance of a first coil winding corresponding to the first calibration tapping node according to the first current and the first voltage.
7. A resistance testing method applied to the resistance testing device of the dry-type transformer tapping winding of claim 2, characterized in that the resistance testing method comprises the following steps:
determining a second calibration tapping node and a first detection tapping node;
one end of the direct current source is connected with a second calibration tapping node of the second coil winding, the head end of the second coil winding is connected with a first detection tapping node of the first coil winding, the head end of the first coil winding is connected with the other end of the direct current source, and the first voltage measuring device is arranged between the head end of the second coil winding and the second calibration tapping node;
acquiring a second current through the direct current source;
measuring a second voltage corresponding to the second calibration tapping node according to the first voltage measuring device;
and calculating a second resistance of the second coil corresponding to the second calibration tapping node according to the second current and the second voltage.
8. A resistance testing method applied to the resistance testing device of the dry-type transformer tapping winding of claim 3, characterized in that the resistance testing method comprises the following steps:
determining a first calibration tapping node and a second calibration tapping node;
one end of the direct current source is connected with the head end of the first coil winding, a first calibration tapping node of the first coil winding is connected with the head end of the second coil winding, a second calibration tapping node of the second coil winding is connected with the other end of the direct current source, a first voltage measuring device is arranged between the head end of the first coil winding and the first calibration tapping node, and a second voltage measuring device is arranged between the head end of the second coil winding and the second calibration tapping node;
obtaining a third current through the direct current source;
measuring a third voltage corresponding to the first calibration tapping node according to the first voltage measuring device, and measuring a fourth voltage corresponding to the second calibration tapping node according to the second voltage measuring device;
and calculating a third resistance of the first coil winding corresponding to the first calibration tapping node according to the third current and the third voltage, and calculating a fourth resistance of the second coil winding corresponding to the second calibration tapping node according to the third current and the fourth voltage.
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| CN202110888758.3A CN113391131B (en) | 2021-08-03 | 2021-08-03 | Resistance testing device and method for dry-type transformer tapping winding |
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| CN202110888758.3A CN113391131B (en) | 2021-08-03 | 2021-08-03 | Resistance testing device and method for dry-type transformer tapping winding |
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Citations (14)
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