CN111175577B - Method for detecting single-phase direct current resistance of in-phase and anti-parallel winding on secondary side of rectifier transformer - Google Patents
Method for detecting single-phase direct current resistance of in-phase and anti-parallel winding on secondary side of rectifier transformer Download PDFInfo
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- CN111175577B CN111175577B CN202010015145.4A CN202010015145A CN111175577B CN 111175577 B CN111175577 B CN 111175577B CN 202010015145 A CN202010015145 A CN 202010015145A CN 111175577 B CN111175577 B CN 111175577B
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Abstract
The invention discloses a method for detecting the single-phase direct-current resistance of an in-phase and anti-parallel winding on the secondary side of a rectifier transformer, and aims to provide a method for detecting the single-phase direct-current resistance of the in-phase and anti-parallel winding on the secondary side of the rectifier transformer. It is carried out by adopting a single-phase direct current resistance tester; the method adopts a short-circuit wire to short-circuit two windings to be tested on the secondary side of the rectifier transformer, so that the two windings of the direct current resistance to be measured on the secondary side of the rectifier transformer are connected in series, and the direct current resistance of the two groups of windings is respectively measured by switching two control switches without stopping a direct current resistance tester during measurement. The invention is suitable for the method for testing the direct current resistance of the windings of the rectifier transformer secondary sides with various capacities in the same phase and inverse parallel connection, and has strong popularization and practicability.
Description
Technical Field
The invention relates to the technical field of rectifier transformers, in particular to a method for detecting a single-phase direct-current resistance of a secondary side in-phase inverse parallel winding of a rectifier transformer.
Background
When the rectifier transformer works normally, the operating current of the secondary side in-phase inverse parallel connection of the plurality of windings reaches thousands of amperes, if the connection point is unreliable, the direct current resistance value of the windings exceeds 2 percent of the normal value, the heat productivity is increased greatly, and serious faults that the transformer windings are burnt out can be enlarged. In order to ensure the integrity and reliability of the rectifier transformer, the dc resistance of the rectifier transformer must be measured periodically according to electrical testing procedures. The purpose of measurement is as follows: the method can check whether the direct current resistance value of each winding on the secondary side of the rectifier transformer is in a qualified range and is compared with the previous measured value and the factory value to check whether the direct current resistance value is abnormal or not, and can also check whether the welding quality of each winding joint, the winding have turn-to-turn short circuit or not, whether the connection is stable and reliable or not, whether the outgoing line has fracture or not, looseness or not and whether the winding of a multi-strand wire has strand fracture or not. It is important that the dc resistance of the 12 windings on the secondary side be measured accurately and quickly.
The principle of the secondary side winding direct current resistance measurement is that a direct current power supply for special direct current resistance test is conducted in the winding, voltage drop is generated on the resistance of the winding, the current passing through the winding and the voltage drop on the winding are measured, and the direct current resistance of the winding can be calculated according to ohm's law.
According to the conventional method, a single-phase direct current resistance tester is used for measurement, taking a 220kV rectifier transformer as an example, a secondary side winding schematic diagram (shown in a figure 1) is converted into a secondary side triangular winding (shown in a figure 2) of the rectifier transformer, and a secondary side winding 1 is measured: a11/a41- - -b31/b51, a12/a42- - -b32/b52, b31/b51- - -c51/c21, b32/b52- - -c22/c52, a11/a41- - -c21/c51, and a12/a42- - -c22/c 52. And measuring the secondary side winding 2: the direct current resistance of 12 groups of windings of a11/a41- - -b31/b51, a12/a42- - -b32/b52, b31/b51- - -c51/c21, b32/b52- - -c22/c52, a11/a41- - -c21/c51, a12/a42- - -c22/c52 is conventionally: the test clamp of the single-phase direct-current resistance tester is respectively clamped at the tap ends of the a11/a 41-b 31/b51 windings (the instrument end is a V + I + V-I-direct-current output, the clamp end V + I + is combined into an anode red clamp, and the V-I-is combined into a cathode black clamp). The triangle structure of the secondary side winding of the rectifier transformer is converted into a graph (as shown in figure 2), so that the charging measurement is carried out by using a triangle structure three-phase winding, because the iron core is slowly saturated due to the effects of the inductance and the resistance of the winding, the charging time is too long, and the measured value is drifted and unstable. In the test process, 30 minutes are needed for measuring one winding, 6 to 8 hours are needed for measuring the direct current resistance of 12 windings on the secondary side of the rectifier transformer, and the efficiency is too low.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for detecting the single-phase direct current resistance of the in-phase anti-parallel winding on the secondary side of the rectifier transformer, which has high measurement efficiency.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the method for detecting the single-phase direct current resistance of the in-phase and anti-parallel winding on the secondary side of the rectifier transformer is carried out by adopting a single-phase direct current resistance tester; the method adopts a short-circuit wire to short-circuit two windings to be tested on the secondary side of the rectifier transformer, so that two windings of direct current resistance to be measured on the secondary side of the rectifier transformer are connected in series, the direct current resistance tester is not stopped during measurement, and the direct current resistance of the two groups of windings is respectively measured through the switching of two control switches.
The method specifically measures as follows:
(1) manufacturing an insulated soft copper wire, pressing copper wire noses at two ends of the insulated soft copper wire, and firmly welding the copper wire noses to be used as a short-circuit wire of current;
(2) two 220V direct current control switches are used for respectively connecting positive and negative voltage wires of a single-phase direct current resistance tester to two ends of a tap of a winding to be tested;
(3) the measurement is performed by switching the control switch.
Preferably, the insulated soft copper wire is a 35-square wire with the length of 8 meters.
Preferably, the copper wire nose adopts a 100A copper wire nose.
Compared with the prior art, the invention has the following advantages:
the method can accurately and quickly measure the direct current resistance of the secondary side of the rectifier transformer, greatly saves the detection time, and improves the detection efficiency and the measurement accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a prior art method for measuring the dc resistance of the secondary winding of a 220kV rectifier transformer by using a single-phase dc resistance tester.
Fig. 2 is a triangular structure diagram of fig. 1 converted to measure the dc resistance of the secondary winding of the rectifier transformer.
Fig. 3-5 are triangular structural diagrams of the invention for measuring the direct current resistance of the secondary winding of the rectifier transformer.
In the figure: the device comprises a transformer secondary winding 1, a single-phase direct-current resistance tester 2, a short wire 3 and control switches QF1 and QF 2.
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 obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The method for detecting the single-phase direct current resistance of the in-phase anti-parallel winding on the secondary side of the rectifier transformer is carried out by adopting a single-phase direct current resistance tester; the method adopts a short-circuit wire to short-circuit two windings to be tested on the secondary side of the rectifier transformer, so that two windings of direct current resistance to be measured on the secondary side of the rectifier transformer are connected in series, the direct current resistance tester is not stopped during measurement, and the direct current resistance of the two groups of windings is respectively measured through the switching of two control switches.
The method specifically measures as follows:
(1) an insulated soft copper wire with the length of 8 meters and the length of 35 square millimeters is manufactured, a copper wire nose of 100A is pressed at two ends of the insulated soft copper wire, and the insulated soft copper wire is firmly welded and used as a short current connection wire. (see, FIG. 3, FIG. 4, FIG. 5)
2. Two 220V direct current control switches QF1 and QF2 are used for respectively connecting positive and negative voltage wires of the single-phase direct current resistance tester to two ends of a tap of a winding to be tested. (see fig. 3, 4, 5);
(3) the measurement is carried out through the respective switch-on and switch-off control switches QF1 and QF2, and the specific measurement is as follows:
(a) measuring direct-current resistance of a11/a 41-b 31/b51, a12/a 42-b 32/b 52:
as shown in fig. 3: a test current clamp anode of the direct current resistance tester clamps a secondary a11/a41 winding tap end of a rectifier transformer, and a test current cathode clamp b32/b52 winding tap end. The tap end of the a12/a42 winding and the tap end of the b31/b51 winding are shorted by an insulated soft copper wire. The positive electrode test voltage is connected to the a11/a41 winding tap end through the positive electrode of a control switch QF1, the positive electrode of the QF2 is connected to the a12/a42 winding tap end, the negative electrode test voltage is connected to the b31/b51 winding tap end through the negative electrode of a control switch QF1, and the negative electrode of the QF2 is connected to the b32/b52 winding tap end.
The method comprises the steps of measuring direct-current resistances of windings a11/a 41-b 31/b51, switching on a QF1 switch, measuring direct-current resistances of windings a11/a 41-b 31/b31, and switching off the QF1 switch after measurement.
Measuring direct-current resistance of windings from a12/a42 to b32/b52, switching on the QF2 switch, measuring direct-current resistance of windings from a12/a42 to b32/b52, and switching off the QF2 switch after measurement.
(b) Measuring the direct current resistance of b31/b51- - -c51/c21, b32/b52- - -c22/c 52:
as shown in fig. 4: a test current clamp anode of a direct current resistance tester clamps a secondary c21/c51 winding tap end of a rectifier transformer, and a test current cathode clamp c22/c52 winding tap end. The tap end of the b32/b52 winding and the tap end of the b31/b51 winding are shorted by an insulated soft copper wire. The positive electrode test voltage is connected to the c21/c51 winding tap end through the positive electrode of a control switch QF1, the positive electrode of the QF2 is connected to the b31/b51 winding tap end, the negative electrode test voltage is connected to the b31/b51 winding tap end through the negative electrode of a control switch QF1, and the negative electrode of the QF2 is connected to the c22/c52 winding tap end.
The method comprises the steps of measuring the direct-current resistance of windings b31/b 51-c 51/c21, switching on a QF1 switch, measuring the direct-current resistance of the windings b31/b 51-c 51/c21, and switching off the QF1 switch after measurement.
Measuring the direct current resistance of the windings b32/b 52-c 22/c52, switching on the QF2 switch, measuring the direct current resistance of the windings b32/b 52-c 22/c52, and switching off the QF2 switch after the measurement is finished.
(c) Measuring direct-current resistance of a11/a 41-c 21/c51, a12/a 42-c 22/c 52:
as shown in fig. 5: a current clamp anode of a direct current resistance tester clamps a winding tap end of a secondary a11/a41 winding of a rectifier transformer, and a test current cathode clamp c22/c52 winding tap end. The tap end of the c21/c51 winding and the tap end of the a12/a42 winding are shorted by an insulated soft copper wire. The positive test voltage is connected to the a11/a41 winding tap end through the positive electrode of a control switch QF1, and the positive electrode of QF2 is connected to the a12/a42 winding tap end. The negative test voltage is connected to the tap end of the c21/c51 winding through the negative terminal of the control switch QF1, and the negative terminal of QF2 is connected to the tap end of the c22/c52 winding.
The method comprises the steps of measuring direct-current resistances of a11/a 41-c 21/c51 windings, switching on a QF1 switch, measuring direct-current resistances of a11/a 41-c 21/c51 windings, and switching off the QF1 switch after measurement.
Measuring direct-current resistance of windings a12/a 42-c 22/c52, switching on the QF2 switch, measuring direct-current resistance of windings a12/a 42-c 22/c52, and switching off the QF2 switch after measurement.
After short circuit, the direct current clamp actually charges the two triangular windings on the secondary side of the rectifier transformer by direct current at the same time, and direct current voltage is applied to two ends of one test winding, so that the charging transition process of an inductor in a circuit is weakened to a great extent, the iron core is saturated quickly, the time for the corresponding winding circuit to achieve stable charging is greatly shortened, the practice proves that the time for measuring the direct current resistance of one winding is shortened to about 2 minutes to complete the test, the data is stable, and the test efficiency and the reliability of the measurement result are greatly improved.
The method of the invention is adopted to carry out specific tests, the direct current resistance test methods of 12 groups of windings in parallel connection in the same phase on the secondary side of the rectifier transformer are compared, and after the comparison of the measurement time, the test time adopting the method of the invention is obviously shortened as shown in the following table:
the rapid detection method for the DC resistance of the in-phase anti-parallel winding on the secondary side of the rectifier transformer is suitable for testing the DC resistance of the in-phase anti-parallel winding on the secondary side of the rectifier transformer with various capacities, and has strong popularization and practicability.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. It will be understood by those skilled in the art that any modification, equivalent replacement, or improvement made on the technical solutions or parts of the technical features described in the above embodiments can be included in the scope of protection of the present invention within the spirit and principle of the present invention.
Claims (4)
1. The method for detecting the single-phase direct current resistance of the in-phase and anti-parallel winding on the secondary side of the rectifier transformer is carried out by adopting a single-phase direct current resistance tester; the method is characterized in that: the method adopts a short-circuit wire to short-circuit two windings to be tested on the secondary side of the rectifier transformer, the short-circuit wire is connected with one phase of one parallel winding in the same-phase inverse parallel winding and the other phase of the parallel winding, so that the two windings of the direct current resistance to be measured on the secondary side of the rectifier transformer are connected in series, and the direct current resistance of the two groups of windings is respectively measured by switching two control switches without stopping a direct current resistance tester during measurement.
2. The method for detecting the single-phase direct current resistance of the in-phase and anti-parallel winding on the secondary side of the rectifier transformer according to claim 1, characterized in that: the method specifically measures as follows:
(1) manufacturing an insulated soft copper wire, pressing copper wire noses at two ends of the insulated soft copper wire, and firmly welding the copper wire noses to be used as a short-circuit wire of current;
(2) two 220V direct current control switches are used for respectively connecting positive and negative voltage wires of a single-phase direct current resistance tester to two ends of a tap of a winding to be tested;
(3) the measurement is performed by switching the control switch.
3. The method for detecting the single-phase direct current resistance of the secondary side in-phase anti-parallel winding of the rectifier transformer as claimed in claim 2, characterized in that: the insulated soft copper wire is a 35-square wire with the length of 8 meters.
4. The method for detecting the single-phase direct current resistance of the secondary side in-phase anti-parallel winding of the rectifier transformer as claimed in claim 2, characterized in that: the copper wire nose adopts a 100A copper wire nose.
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| CN202010015145.4A CN111175577B (en) | 2020-01-07 | 2020-01-07 | Method for detecting single-phase direct current resistance of in-phase and anti-parallel winding on secondary side of rectifier transformer |
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| CN111175577B true CN111175577B (en) | 2022-09-06 |
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| CN2199540Y (en) * | 1994-07-25 | 1995-05-31 | 宋伟新 | Fast measuring bridge for DC resistance of power transformer |
| CN100344042C (en) * | 2004-11-25 | 2007-10-17 | 郑州大学 | Method for realizing driving and power generation by using harmonic wave and apparatus using same method |
| EP2511998B1 (en) * | 2011-04-13 | 2015-08-26 | AEG Power Solutions GmbH | Assembly for earth connection surveillance in an alternating current circuit and power supply assembly with such an earth connection surveillance |
| CN102866299B (en) * | 2011-07-08 | 2017-03-15 | 保定市金源科技有限公司 | A kind of DCR of Transformer method of testing |
| CN202886475U (en) * | 2012-11-21 | 2013-04-17 | 保定金迪科学仪器有限公司 | Direct current resistance measuring meter of three-phase inductive coil |
| CN104749440B (en) * | 2015-04-03 | 2017-08-04 | 国家电网公司 | A kind of large-scale power transformer D.C. resistance method for rapidly testing |
| CN105866475A (en) * | 2016-03-25 | 2016-08-17 | 国网天津市电力公司 | Auxiliary wiring apparatus for testing direct current resistor in transformer and testing method |
| CN105785095A (en) * | 2016-04-21 | 2016-07-20 | 中车青岛四方机车车辆股份有限公司 | Constant-amplitude DC pulse signal measurement circuit and degaussing method thereof |
| KR101672030B1 (en) * | 2016-04-29 | 2016-11-02 | 편도균 | Apparatus for informing electric transformer short and incline of utility pole |
| CN206223870U (en) * | 2016-12-01 | 2017-06-06 | 保定天威保变电气股份有限公司 | One kind is applied to YNd11 large-scale power transformer low resistance measurement apparatus |
| CN107367637A (en) * | 2017-07-14 | 2017-11-21 | 国网福建省电力有限公司 | The automatic testing method of Transformer Winding insulaion resistance and dielectric loss detecting instrument |
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