CN113484797A - Short-circuit bearing capacity test method for single-phase three-winding traction transformer for AT power supply - Google Patents
Short-circuit bearing capacity test method for single-phase three-winding traction transformer for AT power supply Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention discloses a method for testing short circuit bearing capacity of a single-phase three-winding traction transformer for AT power supply, which comprises the following steps: (1) the T terminal of the traction winding 2 and the F terminal of the feed winding 3 are in short circuit and are grounded, current is applied to the A terminal and the X terminal of the high-voltage winding 1, and the current is respectively carried out at the maximum tapping position, the rated tapping position and the minimum tapping position of the high-voltage winding; (2) the T terminal and the N terminal of the traction winding 2 are in short circuit and grounded, current is applied to the A terminal and the X terminal of the high-voltage winding 1, and the current is respectively carried out at the maximum tapping position, the rated tapping position and the minimum tapping position of the high-voltage winding; (3) the F terminal and the N terminal of the feed winding 2 are in short circuit and grounded, current is applied to the A terminal and the X terminal of the high-voltage winding 1, and the current is respectively carried out at the maximum tapping position, the rated tapping position and the minimum tapping position of the high-voltage winding; (4) and comparing the phase reactance values before and after the test is finished, and comparing the relative position change of each part of the transformer body before and after the test, thereby judging whether the transformer passes the short circuit bearing capacity test.
Description
Technical Field
The invention relates to a method for testing short-circuit bearing capacity of a single-phase three-winding traction transformer for AT power supply.
Background
The transformer short-circuit bearing capacity test is a tolerance test of the transformer under the action of short-circuit current, and is an examination on the technical capacity and the process level of the transformer. The traction transformer is used as an important device in power supply of an electrified railway, the transformer is required to bear 100 times of short circuit at a low-voltage side every year, wherein the short circuit at the near end accounts for about 50%, and therefore the requirement on short circuit resistance of the traction transformer is higher.
The single-phase three-winding traction transformer for AT power supply is composed of a high-voltage winding 1, a low-voltage traction winding 2 and a low-voltage feed winding 3, wherein two terminals A and X are led out from the high-voltage winding 1, two terminals T and N are led out from the traction winding 2, two terminals F and N are led out from the feed winding 3, and the terminal N of the traction winding 2 and the terminal N of the feed winding 3 are the same terminal. S1 is the rated capacity of the high-voltage winding 1, S2 is the rated capacity of the traction winding 2, and S3 is the rated capacity of the feed winding 3. U1 is the rated input voltage of the high voltage winding 1, U2 is the rated output voltage of the traction winding 2, and U3 is the rated output voltage of the feed winding 3. According to the AT power supply requirement, the rated capacity S2 of the traction winding 2 and the rated capacity S3 of the feed winding 3 are both 62.5% of the rated capacity S1 of the high-voltage winding, or the rated capacity S2 of the traction winding 2 is 80% of the rated capacity S1 of the high-voltage winding, and the rated capacity S3 of the feed winding 3 is 50% of the rated capacity S1 of the high-voltage winding. The rated input voltage U1 of the high voltage winding 1 depends on the grid system voltage, and the output voltage U2 of the traction winding 2 and the output voltage U3 of the feed winding are both 27.5 kV.
The existing short circuit endurance test method is to short-circuit and ground a T terminal of a low-voltage traction winding 2 and an F terminal of a low-voltage feed winding 3, as shown in fig. 2, at this time, a low-voltage side is that the traction winding 2 and the feed winding 3 are connected in series to form a winding. In the test, a current was applied to the terminals a and X of the high-voltage winding 1, and the applied current was equal to the peak value of the short-circuit current, and was generally K times the rated current. And comparing the phase reactance values before and after the test, and comparing the relative position change of each part of the transformer body before and after the test, thereby judging whether the transformer passes the short circuit bearing capacity test. The tests are respectively carried out at the maximum tapping position, the rated tapping position and the minimum tapping position of the high-voltage winding, and 3 short-circuit tests are counted.
In the existing short circuit bearing capacity test, the T end of the low-voltage traction winding 2The sub-terminal and the F terminal of the low-voltage feed winding 3 are in short circuit and are grounded, and the A and X terminals of the high-voltage winding 1 apply short-circuit current, wherein the applied current is the peak value of the short-circuit current and is usually K times of rated current. Because the low-voltage side traction winding 2 and the feed winding 3 are connected in series to form a winding, the voltage between the T terminal and the F terminal is U2+ U3-55 kV, and the rated current is
In fact, when the rated capacity S2 of the traction winding 2 and the rated capacity S3 of the feed winding 3 are both 62.5% of the rated capacity S1 of the high-voltage winding 1, the rated current of the traction winding 2 and the feed winding 3 is
Or when the rated capacity S2 of the traction winding 2 is 80% of the rated capacity S1 of the high-voltage winding 1 and the rated capacity S3 of the feed winding 3 is 50% of the rated capacity S1 of the high-voltage winding 1, the rated current of the traction winding 2 is
Rated current of the feed winding 3 is
It can be seen that if the traction winding 2 or the feed winding 3 respectively generates an abrupt short circuit, the short circuit current is greater than or equal to the short circuit current when the traction winding 2 and the feed winding 3 are connected in series, so that the short circuit resistance of the transformer in the actual operation process cannot be really examined by the conventional short circuit bearing capacity test.
The invention aims to provide a method for testing the short-circuit bearing capacity of a single-phase three-winding traction transformer for AT power supply, and complete examination of the short-circuit resistance of the transformer is realized.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a method for testing the short-circuit bearing capacity of a single-phase three-winding traction transformer for AT power supply.
The method for testing the short-circuit bearing capacity of the single-phase three-winding traction transformer for AT power supply comprises the following steps:
(1) the T terminal of the traction winding 2 and the F terminal of the feed winding 3 are in short circuit and are grounded, current is applied to the A terminal and the X terminal of the high-voltage winding 1, the current is respectively carried out at the maximum tapping position, the rated tapping position and the minimum tapping position of the high-voltage winding, and 3 times of short circuit tests are counted;
(2) the T terminal and the N terminal of the traction winding 2 are in short circuit and are grounded, current is applied to the A terminal and the X terminal of the high-voltage winding 1, and the current is respectively carried out at the maximum tapping position, the rated tapping position and the minimum tapping position of the high-voltage winding, and 3 short circuit tests are counted;
(3) the method comprises the following steps of (1) short-circuiting and grounding an F terminal and an N terminal of a feed winding 2, applying current to an A terminal and an X terminal of a high-voltage winding 1, and respectively carrying out maximum tapping, rated tapping and minimum tapping positions of the high-voltage winding for 3 times of short-circuit tests;
(4) and comparing the phase reactance values before and after the test, and comparing the relative position change of each part of the transformer body before and after the test, thereby judging whether the transformer passes the short circuit bearing capacity test.
As a further improvement, in step (1), the currents applied to the terminals a and X of the high-voltage winding 1 are at the peak of the short-circuit current, which is usually K times the rated current, and the rated current capacity reference is the rated capacity S1 of the high-voltage winding 1.
As a further improvement, in step (2), the currents applied to the terminals a and X of the high-voltage winding 1 are at the peak of the short-circuit current, which is usually K times the rated current, and the rated current capacity reference is the rated capacity S2 of the traction winding 2.
As a further improvement, in step (3), the currents applied to the terminals a and X of the high-voltage winding 1 are at the peak of the short-circuit current, which is usually K times the rated current, and the rated current capacity is referenced to the rated capacity S3 of the feed winding 3.
Has the advantages that:
the method for testing the short-circuit bearing capacity of the single-phase three-winding traction transformer for AT power supply respectively performs 9 times of short-circuit bearing capacity tests on the high-voltage winding, the traction winding and the feed winding under respective rated capacity, maximum tapping, rated tapping and minimum tapping, ensures the short-circuit resistance of the transformer in various states, and ensures the safe and reliable operation of the transformer of the AT power supply system.
Drawings
FIG. 1 is a schematic diagram of a winding of a single-phase three-winding traction transformer;
FIG. 2 is a wiring diagram of a T-F terminal in a short-circuit endurance test of a conventional single-phase three-winding traction transformer;
FIG. 3 is a wiring diagram of a T-N terminal of a short circuit bearing capacity test of a single-phase three-winding traction transformer of the invention;
FIG. 4 is a wiring diagram of the F-N terminal of the single-phase three-winding traction transformer short circuit bearing capacity test of the invention; 1. high-voltage winding 2, low-voltage traction winding 3 and low-voltage feed winding.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
The method for testing the short-circuit bearing capacity of the single-phase three-winding traction transformer for AT power supply comprises the following steps:
(1) the T terminal of the traction winding 2 and the F terminal of the feed winding 3 are in short circuit and are grounded, current is applied to the A terminal and the X terminal of the high-voltage winding 1, the current is respectively carried out at the maximum tapping position, the rated tapping position and the minimum tapping position of the high-voltage winding, and 3 times of short circuit tests are counted;
(2) and (3) short-circuiting and grounding the T terminal and the N terminal of the traction winding 2, applying current to the A terminal and the X terminal of the high-voltage winding 1, and respectively carrying out the short-circuit tests at the maximum tapping position, the rated tapping position and the minimum tapping position of the high-voltage winding for 3 times.
(3) And (3) short-circuiting and grounding the terminal F and the terminal N of the feed winding 2, applying current to the terminal A and the terminal X of the high-voltage winding 1, and respectively carrying out the short-circuit tests at the maximum tapping position, the rated tapping position and the minimum tapping position of the high-voltage winding for 3 times.
(4) And comparing the phase reactance values before and after the test, and comparing the relative position change of each part of the transformer body before and after the test, thereby judging whether the transformer passes the short circuit bearing capacity test.
In step (1), the currents applied to the terminals a and X of the high-voltage winding 1 are short-circuit current peaks, and are usually K times the rated current, and the rated current capacity reference is the rated capacity S1 of the high-voltage winding 1.
In step (2), the current applied to the terminals a and X of the high-voltage winding 1 is a short-circuit current peak value, and is usually K times the rated current, and the rated current capacity reference is the rated capacity S2 of the traction winding 2.
In step (3), the currents applied to the terminals a and X of the high-voltage winding 1 are short-circuit current peaks, and are usually K times the rated current, and the rated current capacity reference is the rated capacity S3 of the feed winding 3.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
- The method for testing the short-circuit bearing capacity of the single-phase three-winding traction transformer for AT power supply is characterized by comprising the following steps of:(1) the T terminal of the traction winding 2 and the F terminal of the feed winding 3 are in short circuit and are grounded, current is applied to the A terminal and the X terminal of the high-voltage winding 1, the current is respectively carried out at the maximum tapping position, the rated tapping position and the minimum tapping position of the high-voltage winding, and 3 times of short circuit tests are counted;(2) the T terminal and the N terminal of the traction winding 2 are in short circuit and are grounded, current is applied to the A terminal and the X terminal of the high-voltage winding 1, and the current is respectively carried out at the maximum tapping position, the rated tapping position and the minimum tapping position of the high-voltage winding, and 3 short circuit tests are counted;(3) the method comprises the following steps of (1) short-circuiting and grounding an F terminal and an N terminal of a feed winding 2, applying current to an A terminal and an X terminal of a high-voltage winding 1, and respectively carrying out maximum tapping, rated tapping and minimum tapping positions of the high-voltage winding for 3 times of short-circuit tests;(4) and comparing the phase reactance values before and after the test, and comparing the relative position change of each part of the transformer body before and after the test, thereby judging whether the transformer passes the short circuit bearing capacity test.
- 2. The method for testing short-circuit tolerance of a single-phase three-winding traction transformer for AT power supply according to claim 1, wherein the current applied to the A and X terminals of the high-voltage winding 1 in the step (1) is the peak value of the short-circuit current, which is usually K times of the rated current, and the capacity reference of the rated current is the rated capacity S1 of the high-voltage winding 1.
- 3. The method for testing short-circuit tolerance of a single-phase three-winding traction transformer for AT power supply according to claim 1, wherein the current applied to the A and X terminals of the high-voltage winding 1 in the step (2) is the peak value of the short-circuit current, which is usually K times of the rated current, and the capacity reference of the rated current is the rated capacity S2 of the traction winding 2.
- 4. The method for testing short-circuit tolerance of a single-phase three-winding traction transformer for AT power supply according to claim 1, wherein the current applied to the A and X terminals of the high-voltage winding 1 in the step (3) is the peak value of the short-circuit current, which is usually K times of the rated current, and the capacity reference of the rated current is the rated capacity S3 of the feed winding 3.
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| CN202110660143.5A CN113484797A (en) | 2021-06-15 | 2021-06-15 | Short-circuit bearing capacity test method for single-phase three-winding traction transformer for AT power supply |
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| CN202110660143.5A CN113484797A (en) | 2021-06-15 | 2021-06-15 | Short-circuit bearing capacity test method for single-phase three-winding traction transformer for AT power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116165468A (en) * | 2023-02-22 | 2023-05-26 | 正泰电气股份有限公司 | Method and device for testing stable winding of transformer and electronic equipment |
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2021
- 2021-06-15 CN CN202110660143.5A patent/CN113484797A/en active Pending
Patent Citations (7)
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| CN101871960A (en) * | 2009-04-23 | 2010-10-27 | 特变电工股份有限公司 | Test method of transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116165468A (en) * | 2023-02-22 | 2023-05-26 | 正泰电气股份有限公司 | Method and device for testing stable winding of transformer and electronic equipment |
| CN116165468B (en) * | 2023-02-22 | 2023-12-01 | 正泰电气股份有限公司 | Method and device for testing stable winding of transformer and electronic equipment |
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