CN114113737A - 150kV zero-flux direct current transformer - Google Patents
150kV zero-flux direct current transformer Download PDFInfo
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- CN114113737A CN114113737A CN202111441968.4A CN202111441968A CN114113737A CN 114113737 A CN114113737 A CN 114113737A CN 202111441968 A CN202111441968 A CN 202111441968A CN 114113737 A CN114113737 A CN 114113737A
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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
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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Abstract
The invention relates to the field of transformers, and provides a 150kV zero-flux direct current transformer. A ground potential shielding cylinder is arranged in the high-voltage shell, three groups of independent iron core coils are arranged in the ground potential shielding cylinder, each iron core coil comprises a pair of coaxial identical iron cores, and coils are uniformly wound on the iron cores; the base is provided with circuit modules correspondingly connected with the three groups of independent iron core coils, the iron core coils are connected with the corresponding circuit modules through cables, a lead pipe is arranged in the insulating sleeve, one end of the lead pipe is connected with the ground potential shielding cylinder, the other end of the lead pipe extends into the base, and the cables penetrate through the lead pipe; the high-voltage shell is connected with a horizontal conducting rod in a penetrating mode, and the conducting rod penetrates through the ground potential shielding cylinder and six coaxial iron cores of the three groups of iron core coils. The technical scheme has good whole-process linearity, high precision, stability and reliability.
Description
Technical Field
The invention relates to the field of transformers, in particular to a 150kV zero-flux direct current transformer.
Background
With the rapid development of high-voltage direct-current transmission in China, more and more direct-current projects are available. At present, all zero-flux direct current transformers adopted in domestic direct current engineering are imported from foreign countries, are expensive, are difficult to service after sale, and cannot be guaranteed. The precision of the existing electronic transformer is low, and the electronic transformer is easy to break down when running at low temperature, and can not replace a zero-flux direct current transformer. Although the domestic zero-flux direct current transformer has a breakthrough, the stability of the transformer is still not capable of comprehensively replacing imported products due to the limitation of the manufacturing level of the process. Each group of coils of the traditional zero-flux direct current transformer comprises three iron cores, an electronic module comprises elements such as a power amplifier and an oscillator, the structure is relatively complex, and the process manufacturing difficulty is high.
Disclosure of Invention
In order to overcome the defects of complex circuit structure, insufficient measurement precision and the like of the direct current transformer in the prior art, the invention aims to provide the 150kV zero-flux direct current transformer which is good in whole-process linearity, high in precision and high in stability when the direct current is measured.
The technical scheme adopted by the invention is as follows:
a150 kV zero-flux direct-current transformer comprises a high-voltage shell, an insulating sleeve and a base, wherein the insulating sleeve is connected between the high-voltage shell and the base, a ground potential shielding cylinder is arranged in the high-voltage shell, three groups of independent iron core coils are arranged in the ground potential shielding cylinder, each iron core coil comprises a pair of coaxial same iron cores, and each iron core is uniformly wound with a coil; the base is provided with circuit modules correspondingly connected with the three groups of independent iron core coils, the iron core coils are connected with the corresponding circuit modules through cables, a lead pipe is arranged in the insulating sleeve, one end of the lead pipe is connected with the ground potential shielding cylinder, the other end of the lead pipe extends into the base, and the cables penetrate through the lead pipe; the high-voltage shell is connected with a horizontal conducting rod in a penetrating mode, and the conducting rod penetrates through the ground potential shielding cylinder and six coaxial iron cores of the three groups of iron core coils.
Furthermore, the circuit module comprises an auxiliary alternating current power supply, a plurality of rectifier diodes, a demagnetization resistor and a load resistor, wherein the coils of two iron cores of the iron core coils are connected in parallel to the auxiliary alternating current power supply through the rectifier diodes and form a loop with the load resistor in one period of the auxiliary alternating current power supply respectively.
Further, a rectifier diode D1, a rectifier diode D2, a rectifier diode D3 and a rectifier diode D4 are included, the rectifier diode D1 and the rectifier diode D2 are connected in series between two corresponding terminals of the coils of the two iron cores in the same direction, the rectifier diode D3 and the rectifier diode D4 are connected in series between the other two corresponding terminals of the coils of the two iron cores in the same direction, and the load resistor is connected with the rectifier diodes D3 and D4 in parallel; two ends of the auxiliary alternating current power supply are respectively connected with the junction points of a rectifier diode D1, a rectifier diode D2, a rectifier diode D3 and a diode D4, and the demagnetization resistor is connected with the rectifier diodes D1 and D2 in parallel.
Furthermore, the ground potential shielding cylinder is connected with the high-voltage shell through an epoxy insulating cylinder, two ends of the epoxy insulating cylinder are respectively sleeved with a shielding cover, one end of the shielding cover, far away from the connection end face of the epoxy insulating cylinder, is outwards turned in an arc shape, and a gap is reserved between the inner wall of the shielding cover and the outer wall of the epoxy insulating cylinder.
Further, a guide sleeve is installed at the bottom of the ground potential shielding cylinder and inserted into the lead pipe.
Furthermore, a high-voltage shielding cover is installed in the insulating sleeve, and the high-voltage shielding cover is sleeved on the outer side of the lead tube.
Furthermore, a groove is formed in the inner bottom surface of the high-pressure shell.
Further, a terminal protection box is installed on the base, the cable penetrates through the lead tube to be connected with the terminal protection box, and the terminal protection box is connected with the circuit module.
Still further, the iron core T is made by winding a thin strip of permalloy.
After the technical scheme is adopted, the invention has the beneficial effects that:
1. the secondary windings are connected to the electronic module in parallel, and each group of windings only needs two iron core coils, so that the structure is simple.
2. Three groups of independent secondary windings are arranged in each transformer, and one measuring signal and two protection signals can be output simultaneously.
3. The circuit module adopts the principle of novel parallel connection wires, does not need elements such as a power amplifier, an oscillator and the like, and has stable output signals, high measurement precision, simplicity and reliability.
The technical scheme ensures good whole-process linearity, high precision, stability and reliability through the above mode.
Drawings
FIG. 1 is a schematic diagram of the mechanism of the present invention;
FIG. 2 is a schematic structural diagram of the present iron core coil;
fig. 3 is a schematic diagram of a circuit module.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the accompanying drawings:
as shown in fig. 1, the novel zero-flux direct current transformer of the present invention includes a high voltage housing 1, a ground potential shielding cylinder 2 is installed in the high voltage housing 1, three groups of independent iron core coils 3 are installed in the ground potential shielding cylinder 2, the first group of iron core coils is used for measuring direct current, the second group of iron core coils is used for monitoring ripple waves, that is, the fluctuation condition of the measured direct current, the third group of iron core coils is used for circuit protection, and when the point current value exceeds the current bearing range, the power failure can be realized by outputting or connecting a relay through a corresponding circuit module. Each set of core coils 3 has an independent electronic module 13; the ground potential shielding cylinder 2 is connected with the high-voltage shell 1 through the epoxy insulating cylinder 4, the upper end and the lower end of the epoxy insulating cylinder 4 are respectively provided with the shielding cover 5, and the two ends of the shielding cover 5 are arc-shaped, so that the electric field distribution can be improved, and the electric field is more uniform. Leave the clearance between shield cover 5 and the epoxy section of thick bamboo 4, form the low field intensity region in this clearance, the metal piece in the main part can beat under the strong electric field during transformer operation, and this clearance can collect metal piece, and the low field intensity region who forms can prevent that the piece from beating. The high-voltage shell 1 and the ground potential shielding cylinder 2 penetrate through a horizontal primary conducting rod 6, and the primary conducting rod 6 penetrates through the geometric centers of the three groups of iron core coils. The primary conductive rods 6 form magnetic fluxes in the three sets of core coils 3.
The design of the inside lower surface in 1 am of high-voltage housing has the recess, and these recesses can adjust electric field distribution and form the low field intensity region in the recess, and the metal piece in the mutual-inductor during operation main part can beat under the strong electric field, and the metal piece can be collected to this recess, and the low field intensity region of formation can prevent that the piece from beating. The lower part of the high-voltage shell 1 is connected with a silicon rubber composite insulating sleeve 7, a lead pipe 8 is arranged in the silicon rubber insulating sleeve 7, a guide sleeve 9 is arranged below the ground potential shielding cylinder 2 and inserted into the lead pipe 8, and leads of the three groups of iron core coils 3 penetrate through the lead pipe to be connected with corresponding circuit modules 13. A high-voltage shielding cover 10 is arranged outside the guide sleeve 9; the feed-through tube 8 is able to shield the electromagnetic field of the conductor inside the tube. The guide sleeve 9 is inserted above the lead pipe 8, and the size error of the transformer in the design and installation process can be counteracted through the plug-in structure. A base 11 is arranged below the silicon rubber composite insulating sleeve 7, the base 11 is connected with a terminal protection box 12, and an electronic module 13 correspondingly connected with the iron core coil 3 is arranged in the terminal protection box 12.
As shown in fig. 2, each group of iron core coils 3 includes an annular iron core 31 and an annular iron core 32 which are coaxially arranged, the iron core 31 and the annular iron core 32 have the same geometric dimensions, materials and magnetic properties, the outer diameter is 305mm, the inner diameter is 245mm, and the height is 28 mm; the annular core 31 and the annular core 32 are each made by winding a thin strip of permalloy of 0.16mm thickness. The annular iron core 31 and the annular iron core 32 are uniformly wound with coils, the coils are formed by winding enameled wires with the diameter of 0.83mm, and the number of turns of the enameled wires is 10000.
As shown in fig. 3, the circuit module includes an auxiliary ac power supply 14, a rectifier diode D1, a rectifier diode D2, a rectifier diode D3, a rectifier diode D4, a demagnetization resistor 15, and a load resistor 16, wherein the rectifier diode D1 and the rectifier diode D2 are connected in series in the same direction between two corresponding terminals of the coils of the two cores 31,32, the rectifier diode D3 and the rectifier diode D4 are connected in series in the same direction between the other two corresponding terminals of the coils of the two cores 31,32, and the load resistor 16 is connected in parallel with the rectifier diodes D3, D4; two ends of the auxiliary alternating current power supply 14 are respectively connected with the junction points of the rectifier diode D1, the rectifier diode D2, the rectifier diode D3 and the diode D4, and the demagnetization resistor 15 is connected with the rectifier diode D1 and the rectifier diode D2 in parallel.
Since direct current is supplied to the primary conductive rod 6, the magnetic fluxes in the iron core 31 and the iron core 32 of the iron core coil 3 do not change, and therefore, no current is generated in the secondary winding, and the current value of the primary winding cannot be measured by the secondary winding. Therefore, the auxiliary ac power supply 14 is used to form two parallel secondary coil circuits by using the rectifier diode. During each half cycle of the auxiliary ac power supply 14, the core in one of the secondary windings is excited in the reverse direction so that the magnetic flux in the core is zero and reaches a zero flux state, while the other secondary winding excites the core in the winding in the forward direction so that the magnetic flux in the core is greater. In a sine period of the auxiliary alternating current power supply 14, due to the action of the rectifier diodes, the coils on the two iron cores 31 and 32 respectively generate current alternately and form a loop with the load resistor 16, and the current test of the primary coil is realized through the test of the current or the voltage of the load resistor 16.
Claims (9)
1. A150 kV zero-flux direct-current transformer comprises a high-voltage shell, an insulating sleeve and a base, wherein the insulating sleeve is connected between the high-voltage shell and the base; the base is provided with circuit modules correspondingly connected with the three groups of independent iron core coils, the iron core coils are connected with the corresponding circuit modules through cables, a lead pipe is arranged in the insulating sleeve, one end of the lead pipe is connected with the ground potential shielding cylinder, the other end of the lead pipe extends into the base, and the cables penetrate through the lead pipe; the high-voltage shell is connected with a horizontal conducting rod in a penetrating mode, and the conducting rod penetrates through the ground potential shielding cylinder and six coaxial iron cores of the three groups of iron core coils.
2. The 150kV zero-flux direct-current transformer according to claim 1, wherein the circuit module comprises an auxiliary alternating-current power supply, a plurality of rectifier diodes, a demagnetization resistor and a load resistor, and the two iron core coils of the iron core coils are connected in parallel to the auxiliary alternating-current power supply through the rectifier diodes and respectively form a loop with the load resistor in one period of the auxiliary alternating-current power supply.
3. The 150kV zero-flux direct-current transformer of claim 2, which comprises a rectifier diode D1, a rectifier diode D2, a rectifier diode D3 and a rectifier diode D4, wherein the rectifier diode D1 and the rectifier diode D2 are connected in series between two corresponding terminals of the coils of the two iron cores in the same direction, the rectifier diode D3 and the rectifier diode D4 are connected in series between the other two corresponding terminals of the coils of the two iron cores in the same direction, and the load resistor is connected in parallel with the rectifier diodes D3 and D4; two ends of the auxiliary alternating current power supply are respectively connected with the junction points of a rectifier diode D1, a rectifier diode D2, a rectifier diode D3 and a diode D4, and the demagnetization resistor is connected with the rectifier diodes D1 and D2 in parallel.
4. The 150kV zero-flux direct-current transformer according to claim 1, wherein the ground potential shielding cylinder is connected with the high-voltage shell through an epoxy insulating cylinder, shielding covers are respectively sleeved at two ends of the epoxy insulating cylinder, one end of each shielding cover, far away from the connection end face of the epoxy insulating cylinder, is outwards turned in an arc shape, and a gap is reserved between the inner wall of each shielding cover and the outer wall of the epoxy insulating cylinder.
5. A 150kV zero-flux direct current transformer according to claim 1, wherein a guide sleeve is installed at the bottom of the ground potential shielding cylinder, and the guide sleeve is inserted into the lead pipe.
6. The 150kV zero-flux direct-current transformer according to claim 1, wherein a high-voltage shielding cover is installed in the insulating sleeve, and the high-voltage shielding cover is sleeved outside the lead tube.
7. The 150kV zero-flux direct-current transformer according to claim 1, wherein a groove is formed on the inner bottom surface of the high-voltage shell.
8. A 150kV zero-flux dc current transformer according to claim 1, wherein a terminal protection box is mounted on the base, the cable is connected to the terminal protection box through a lead tube, and the terminal protection box is connected to a circuit module.
9. A 150kV zero-flux dc current transformer according to claim 1, wherein the iron core T is made by winding permalloy thin strips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111441968.4A CN114113737B (en) | 2021-11-30 | 2021-11-30 | 150kV zero-flux direct current transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111441968.4A CN114113737B (en) | 2021-11-30 | 2021-11-30 | 150kV zero-flux direct current transformer |
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| Publication Number | Publication Date |
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| CN114113737A true CN114113737A (en) | 2022-03-01 |
| CN114113737B CN114113737B (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256894A (en) * | 2007-12-29 | 2008-09-03 | 武汉格蓝若光电互感器有限公司 | Novel high voltage independent electronic type current mutual inductor |
| CN102496446A (en) * | 2011-11-29 | 2012-06-13 | 中国西电电气股份有限公司 | Zero magnetic flux direct-current current transformer |
| CN203366985U (en) * | 2013-07-18 | 2013-12-25 | 衡阳一互电气有限公司 | Novel electronic combined transformer |
| CN106771533A (en) * | 2017-03-15 | 2017-05-31 | 南京航空航天大学 | A kind of alternating current current detection circuit that can reflect direct current biasing state based on Magnetic isolation |
| CN107850626A (en) * | 2015-07-24 | 2018-03-27 | 西门子公司 | Zero-flux current transformer |
| CN212209198U (en) * | 2020-04-03 | 2020-12-22 | 浙江天际互感器有限公司 | Passive zero-flux wide-range current transformer for metering |
-
2021
- 2021-11-30 CN CN202111441968.4A patent/CN114113737B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256894A (en) * | 2007-12-29 | 2008-09-03 | 武汉格蓝若光电互感器有限公司 | Novel high voltage independent electronic type current mutual inductor |
| CN102496446A (en) * | 2011-11-29 | 2012-06-13 | 中国西电电气股份有限公司 | Zero magnetic flux direct-current current transformer |
| CN203366985U (en) * | 2013-07-18 | 2013-12-25 | 衡阳一互电气有限公司 | Novel electronic combined transformer |
| CN107850626A (en) * | 2015-07-24 | 2018-03-27 | 西门子公司 | Zero-flux current transformer |
| CN106771533A (en) * | 2017-03-15 | 2017-05-31 | 南京航空航天大学 | A kind of alternating current current detection circuit that can reflect direct current biasing state based on Magnetic isolation |
| CN212209198U (en) * | 2020-04-03 | 2020-12-22 | 浙江天际互感器有限公司 | Passive zero-flux wide-range current transformer for metering |
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| CN114113737B (en) | 2023-05-23 |
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