CN106842008B - Method for testing on-load switch of transformer - Google Patents
Method for testing on-load switch of transformer Download PDFInfo
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- CN106842008B CN106842008B CN201710004716.2A CN201710004716A CN106842008B CN 106842008 B CN106842008 B CN 106842008B CN 201710004716 A CN201710004716 A CN 201710004716A CN 106842008 B CN106842008 B CN 106842008B
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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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
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses a method for testing an on-load switch of a transformer, and relates to the technical field of power supply maintenance. The on-load switch tester and the on-load switch of the tested transformer are connected to form a test loop, the direct current resistance tester and the on-load switch tester are connected in parallel, and an external auxiliary direct current source is utilized to reduce errors caused by interference in the test process so as to improve the waveform acquisition precision. The method can ensure that the waveform acquisition effect is better and the test of the on-load switch is more accurate.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a method for testing an on-load switch of a transformer.
Background
The on-load tap changer is an important part of the transformer, and the on-load tap changer field test plays an important role in safe operation of the transformer. An alternating current on-load switch test is a necessary item in an electric power on-load high-voltage switch test, and the reliability of the alternating current on-load switch test directly determines whether a transformer can run reliably. Therefore, when the load switch is installed and overhauled, relevant experiments are carried out on the load switch, and the load switch can be ensured to run safely for a long time. The existing method for testing the on-load switch has poor stability, and the contact moment can generate interference during the switching action, thereby influencing the accuracy of the on-load switch transition waveform test.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for testing the on-load switch of the transformer aiming at the defects of the prior art, the method has high stability, the interference generated at the contact moment of the contact during the switching action is small, and the accuracy of the transient waveform test of the on-load switch can be effectively improved so as to ensure the safe operation of the on-load switch.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for testing a transformer on-load switch is characterized in that a test loop is formed by connecting an on-load switch tester and a tested transformer on-load switch to be tested, and the method comprises the following steps: the method comprises the following steps of connecting a direct current resistance tester and the on-load switch tester in parallel, reducing errors caused by interference in the testing process by utilizing an external auxiliary direct current source so as to improve the waveform acquisition precision, and specifically comprises the following steps:
1) checking the indexes of the oil sample, and entering the next step if the indexes are qualified;
2) detecting the direct current resistance of the on-load switch by using a direct current resistance tester or an on-load switch tester, and performing the next step if the direct current resistance of the on-load switch is detected to be qualified;
3) testing a transition waveform:
(1) starting a direct current resistance tester, applying an auxiliary direct current source to the tested phase of the transformer by the direct current resistance tester, and keeping the current constant;
(2) after the applied current is stable, starting the on-load switch tester, connecting an on-load switch test power supply in parallel in the loop, and keeping the current constant; the direction of current applied by the on-load switch tester is consistent with the direction of the direct current resistance tester;
(3) after the current is stable, the on-load switch is restarted or switched to shift, and the on-load switch tester acquires a corresponding transition waveform; the acquired waveform is the waveform required by the test result.
Preferably, the on-load switch tester can realize measurement of transition time, transition waveform, transition resistance and three-phase synchronization parameters of the on-load tap-changer; the DC resistance tester can measure the output current with adjustable gear, and the current at least comprises different measuring gears of 1A,3A,5A and 10A.
Preferably, the on-load switch in the step 2) performs a direct current resistance detection test, and a value between the arcing contact and the main contact needs to be measured, so that a circuitous loop is avoided between the arcing contact and the main contact.
Preferably, the magnitude of the current applied by the direct current resistance tester in the step (1) is 5A; and (3) the current applied by the load switch tester in the step (2) is 1A.
Preferably, before the step (1), the form of the transition waveform is estimated according to the type of the on-load switch and the switching time of the on-load switch; and (4) after the step (3), analyzing the condition of the load switch test according to comparison between the estimated transition waveform and the acquired transition waveform.
Preferably, the switching time of the on-load switch is determined according to different types, and specifically includes: the S type is 35-50 MS, the M type is 35-50 MS, and the V type is 45-65 MS.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the method has high stability, small interference generated at the contact moment of the contact during the switching action, and can effectively improve the accuracy of the on-load switch transition waveform test so as to ensure the safe operation of the on-load switch. The invention can effectively detect the precision of the device system before testing and reduce the possibility of error. The added auxiliary direct current source can avoid the phenomenon of burr caused in the waveform, and the waveform acquisition effect is improved.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention in connection therewith.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, for one embodiment of the present invention,
a method for testing a transformer on-load switch is characterized in that a test loop is formed by connecting an on-load switch tester and a tested transformer on-load switch to be tested, and the method comprises the following steps: the method comprises the following steps of connecting a direct current resistance tester and the on-load switch tester in parallel, reducing errors caused by interference in the testing process by utilizing an external auxiliary direct current source so as to improve the waveform acquisition precision, and specifically comprises the following steps:
1) checking the indexes of the oil sample, and entering the next step if the indexes are qualified;
2) detecting the direct current resistance of the on-load switch by using a direct current resistance tester or an on-load switch tester, and performing the next step if the direct current resistance of the on-load switch is detected to be qualified;
3) testing a transition waveform:
(1) starting a direct current resistance tester, applying an auxiliary direct current source to the tested phase of the transformer by the direct current resistance tester, and keeping the current constant;
(2) after the applied current is stable, starting the on-load switch tester, connecting an on-load switch test power supply in parallel in the loop, and keeping the current constant; the direction of current applied by the on-load switch tester is consistent with the direction of the direct current resistance tester;
(3) after the current is stable, the on-load switch is restarted or switched to shift, and the on-load switch tester acquires a corresponding transition waveform; the acquired waveform is the waveform required by the test result.
The on-load switch tester can realize the measurement of the transition time, the transition waveform, the transition resistance and the three-phase synchronization parameter of the on-load tap-changer; the DC resistance tester can measure the output current with adjustable gear, and the current at least comprises different measuring gears of 1A,3A,5A and 10A.
And (3) performing a direct current resistance detection test on the on-load switch in the step 2), wherein a value between the arc contact and the main contact needs to be measured, and a circuitous loop is avoided between the arc contact and the main contact.
The current applied by the direct current resistance tester in the step (1) is 5A; and (3) the current applied by the load switch tester in the step (2) is 1A.
Before the step (1), the form of a transition waveform is estimated according to the type of the on-load switch and the switching time of the on-load switch; and (4) after the step (3), analyzing the condition of the load switch test according to comparison between the estimated transition waveform and the acquired transition waveform.
The switching time of the on-load switch is determined according to different types, and specifically comprises the following steps: the S type is 35-50 MS, the M type is 35-50 MS, and the V type is 45-65 MS.
When measuring the transition resistance in the step 2), whether a circuitous loop exists between the arc contact and the main contact or not is avoided. For example, when the contacts of the M-type load switch are combined in the singular or the even number, a group of transition resistors on one side of the contact which is not at the combined position should be measured, so that the measurement error caused by a circuitous loop is avoided.
After the technical scheme is adopted, the equipment acquisition precision in the test process of the on-load switch of the transformer can be improved, the waveform acquisition effect is better, and the test of the on-load switch is more accurate.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A method for testing a transformer on-load switch is characterized in that a test loop is formed by connecting an on-load switch tester and a tested transformer on-load switch to be tested, and the method comprises the following steps: the method comprises the following steps of connecting a direct current resistance tester and the on-load switch tester in parallel, reducing errors caused by interference in the testing process by utilizing an external auxiliary direct current source so as to improve the waveform acquisition precision, and specifically comprises the following steps:
1) checking the indexes of the oil sample, and performing the next step if the indexes are qualified;
2) detecting the direct current resistance of the on-load switch by using a direct current resistance tester or an on-load switch tester, and performing the next step when the direct current resistance of the on-load switch is detected to be qualified;
3) testing a transition waveform:
(1) starting a direct current resistance tester, applying an auxiliary direct current source to the tested phase of the transformer by the direct current resistance tester, and keeping the current constant;
(2) after the applied current is stable, starting the on-load switch tester, connecting an on-load switch test power supply in parallel in the test loop by the on-load switch tester, and keeping the current constant; the current direction of an on-load switch testing power supply applied by the on-load switch tester is consistent with the current direction applied by the direct current resistance tester;
(3) after the current is stable, restarting or switching the gear of the on-load switch, and collecting a corresponding transition waveform by the on-load switch tester; the acquired waveform is the waveform required by the test result;
and 2) performing a direct current resistance detection test on the on-load switch in the step 2), wherein a value between the arc contact and the main contact needs to be measured, and a circuitous loop is prevented from being formed between the arc contact and the main contact.
2. The method of claim 1, wherein the on-load switch tester is capable of measuring transition time, transition waveform, transition resistance, and three-phase synchronization parameters of the on-load tap-changer; the DC resistance tester can measure the output current with adjustable gear, and the current at least comprises different measuring gears of 1A,3A,5A and 10A.
3. The method for testing the on-load switch of the transformer according to claim 1, wherein the magnitude of the current applied by the DC resistance tester in the step (1) is 5A; and (3) the current applied by the load switch tester in the step (2) is 1A.
4. The method for testing the on-load switch of the transformer according to claim 1, wherein before the step (1), the form of the transition waveform is estimated according to the type of the on-load switch and the switching time of the on-load switch; and (4) after the step (3), analyzing the condition of the load switch test according to comparison between the estimated transition waveform and the acquired transition waveform.
5. The method for testing the on-load switch of the transformer according to claim 4, wherein the switching time of the on-load switch is determined according to different types, and specifically comprises: the S type is 35-50 MS, the M type is 35-50 MS, and the V type is 45-65 MS.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710004716.2A CN106842008B (en) | 2017-01-04 | 2017-01-04 | Method for testing on-load switch of transformer |
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| CN201710004716.2A CN106842008B (en) | 2017-01-04 | 2017-01-04 | Method for testing on-load switch of transformer |
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| CN106842008B true CN106842008B (en) | 2020-07-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109061459A (en) * | 2018-08-30 | 2018-12-21 | 国网北京市电力公司 | The fault determination method and device of on-load voltage regulating switch, storage medium, processor |
| CN110763992A (en) * | 2019-11-28 | 2020-02-07 | 国网河北省电力有限公司电力科学研究院 | AC/DC comprehensive test method for on-load tap-changer of large transformer |
| CN113030790A (en) * | 2021-02-04 | 2021-06-25 | 华能（天津）煤气化发电有限公司 | Method for checking whether contact of tap changer of transformer is good or not |
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| CN102707181A (en) * | 2012-06-29 | 2012-10-03 | 广州供电局有限公司 | Multi-parameter electrical test control device of power transformer |
| CN103063924A (en) * | 2012-12-27 | 2013-04-24 | 江苏省电力公司电力科学研究院 | Vehicle-mounted integral three-phase direct-current resistance and transformation ratio and load comprehensive testing device and method |
| CN205594052U (en) * | 2016-05-10 | 2016-09-21 | 国网江苏省电力公司电力科学研究院 | Vehicular body jie decreases and direct current resistance transformation ratio has measurement of carrying an automatic switching device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201935973U (en) * | 2010-12-31 | 2011-08-17 | 上海市电力公司 | Integrative test device of electric test of transformer |
| DE102012103736A1 (en) * | 2012-04-27 | 2013-10-31 | Maschinenfabrik Reinhausen Gmbh | Method for monitoring the operation of a tap changer |
| CN103293413B (en) * | 2013-05-19 | 2016-07-06 | 国家电网公司 | A kind of transformer test high pressure special purpose device |
| CN103698621B (en) * | 2013-09-05 | 2016-08-17 | 国家电网公司 | A kind of transformer vehicular integrated test system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707181A (en) * | 2012-06-29 | 2012-10-03 | 广州供电局有限公司 | Multi-parameter electrical test control device of power transformer |
| CN103063924A (en) * | 2012-12-27 | 2013-04-24 | 江苏省电力公司电力科学研究院 | Vehicle-mounted integral three-phase direct-current resistance and transformation ratio and load comprehensive testing device and method |
| CN205594052U (en) * | 2016-05-10 | 2016-09-21 | 国网江苏省电力公司电力科学研究院 | Vehicular body jie decreases and direct current resistance transformation ratio has measurement of carrying an automatic switching device |
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