CN114113737B - 150kV zero-flux direct current transformer - Google Patents
150kV zero-flux direct current transformer Download PDFInfo
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- CN114113737B CN114113737B CN202111441968.4A CN202111441968A CN114113737B CN 114113737 B CN114113737 B CN 114113737B CN 202111441968 A CN202111441968 A CN 202111441968A CN 114113737 B CN114113737 B CN 114113737B
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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. The high-voltage shell is internally provided with a ground potential shielding cylinder, three 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 each iron core; the base is provided with circuit modules correspondingly connected with three groups of independent iron core coils, the iron core coils are connected with the corresponding circuit modules through cables, the insulating sleeve is internally provided with a lead tube, one end of the lead tube is connected with the ground potential shielding cylinder, the other end of the lead tube stretches into the base, and the cables penetrate through the lead tube; 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 the advantages of good whole-course 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
Along with the rapid development of high-voltage direct-current transmission in China, direct-current engineering is more and more. All zero-flux direct current transformers adopted in the current domestic direct current engineering are imported from abroad, are high in price and difficult in after-sale service, and cannot be guaranteed. The existing electronic transformer has lower precision, is easy to fail during low-temperature operation, and cannot replace a zero-flux direct current transformer. Although breakthrough is made on the domestic zero-flux direct current transformer, the domestic zero-flux direct current transformer is limited by the process manufacturing level, and the stability of the domestic zero-flux direct current transformer still cannot fully replace imported products. Each group of coils of the traditional zero-flux direct current transformer comprises three iron cores, a circuit 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
The invention aims to solve the defects of complex circuit structure, insufficient measurement precision and the like of a direct current transformer in the prior art, and provides a 150kV zero-flux direct current transformer with good whole-course linearity, high precision and high stability in direct current measurement.
The technical scheme adopted by the invention is as follows:
the 150kV 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 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 each iron core; the base is provided with circuit modules correspondingly connected with three groups of independent iron core coils, the iron core coils are connected with the corresponding circuit modules through cables, the insulating sleeve is internally provided with a lead tube, one end of the lead tube is connected with the ground potential shielding cylinder, the other end of the lead tube stretches into the base, and the cables penetrate through the lead tube; 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.
Further, 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 the two iron cores of the iron core coil are connected to the auxiliary alternating current power supply in parallel through the rectifier diodes, and form loops with the load resistor respectively in one period of the auxiliary alternating current power supply.
Further, the transformer 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 coils of 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 coils of two iron cores in the same direction, and the load resistor is connected with the rectifier diodes D3 and D4 in parallel; the two ends of the auxiliary alternating current power supply are respectively connected with the junction points of the rectifying diode D1 and the rectifying diode D2 and the junction points of the rectifying diode D3 and the diode D4, and the demagnetization resistor is connected with the rectifying diodes D1 and D2 in parallel.
Further, the ground potential shielding cylinder is connected with the high-voltage shell through the epoxy insulating cylinder, shielding covers are sleeved at two ends of the epoxy insulating cylinder respectively, one end, far away from the connecting end face of the epoxy insulating cylinder, of the shielding cover is turned outwards 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 the guide sleeve is inserted into the guide tube.
Further, a high-voltage shielding cover is arranged in the insulating sleeve, and the high-voltage shielding cover is sleeved on the outer side of the lead tube.
Further, the inner bottom surface of the high-pressure shell is provided with a groove.
Further, a terminal protection box is installed on the base, the cable passes through the lead tube and is 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 of a permalloy thin strip coil.
After the technical scheme is adopted, the beneficial effects of the invention are as follows:
1. the secondary windings are connected to the circuit module in parallel, and each group of windings only needs two iron core coils, so that the structure is simple.
2. Three independent secondary windings are arranged in each transformer, and a measuring signal and two protection signals can be simultaneously output.
3. The circuit module adopts the novel parallel connection principle, 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-course 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 view of the present iron core coil;
fig. 3 is a schematic diagram of a circuit module.
Description of the embodiments
The following detailed description of the invention refers to the accompanying drawings, which illustrate specific embodiments of the invention:
as shown in fig. 1, the novel zero-flux direct current transformer comprises a high-voltage shell 1, wherein a ground potential shielding cylinder 2 is arranged in the high-voltage shell 1, three independent iron core coils 3 are arranged in the ground potential shielding cylinder 2, the first iron core coil is used for measuring direct current, the second iron core coil is used for monitoring ripple, namely the fluctuation condition of the measured direct current, the third iron core coil is used for playing a circuit protection role, and when a point current value exceeds a current bearing range, power failure can be realized through the output of a corresponding circuit module or the connection of a relay and the like. Each group of core coils 3 has an independent circuit module 13; the ground potential shielding cylinder 2 is connected with the high-voltage shell 1 through the epoxy insulating cylinder 4, the shielding cover 5 is respectively arranged at the upper end and the lower end of the epoxy insulating cylinder 4, and the two ends of the shielding cover 5 are arc-shaped, so that electric field distribution can be improved, and an electric field is more uniform. A gap is reserved between the shielding cover 5 and the epoxy insulating cylinder 4, a low field intensity region is formed in the gap, metal scraps in the main body can jump under a strong electric field when the transformer works, the gap can collect the metal scraps, and the formed low field intensity region can prevent scraps from jumping. 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 rod 6 forms magnetic fluxes in the three groups of core coils 3.
The inside lower surface design in high-pressure housing 1 morning has the recess, and these recesses can adjust electric field distribution and form low field strength region in the recess, and the metal chip in the transformer during operation main part can beat under strong electric field, and this recess can collect metal chip, and the low field strength 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 tube 8 is arranged in the silicon rubber insulating sleeve 7, a guide sleeve 9 is arranged below the ground potential shielding cylinder 2 and is inserted into the lead tube 8, and the leads of the three groups of iron core coils 3 penetrate through the lead tube and are connected with corresponding circuit modules 13. The outer side of the guide sleeve 9 is provided with a high-voltage shielding cover 10; the lead-in tube 8 is capable of shielding the electromagnetic field of the wire inside the tube. The guide sleeve 9 is inserted above the guide tube 8, and the inserted structure can offset the dimensional errors of the transformer in the design and installation process. 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 a circuit 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 comprises an annular iron core 31 and an annular iron core 32 which are coaxially arranged, wherein the geometric dimensions, materials and magnetic properties of the iron core 31 and the annular iron core 32 are the same, the outer diameter is 305mm, the inner diameter is 245mm, and the height is 28mm; the toroidal core 31 and the toroidal core 32 are each made of a coil of permalloy thin film 0.16mm thick. The toroidal core 31 and the toroidal core 32 are uniformly wound with coils formed by winding enameled wires having a diameter of 0.83mm, and the number of turns of the coils is 10000.
As shown in fig. 3, the circuit module includes an auxiliary ac power source 14, a rectifying diode D1, a rectifying diode D2, a rectifying diode D3, a rectifying diode D4, a demagnetization resistor 15, and a load resistor 16, where the rectifying diode D1 and the rectifying diode D2 are connected in parallel between two corresponding terminals of the coils of the two cores 31,32, the rectifying diode D3 and the rectifying diode D4 are connected in parallel 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 rectifying diodes D3, D4; the two ends of the auxiliary alternating current power supply 14 are respectively connected with the junction points of the rectifying diode D1, the rectifying diode D2, the rectifying diode D3 and the diode D4, and the demagnetization resistor 15 is connected with the rectifying diode D1 and the rectifying diode D2 in parallel.
Since the direct current is applied to the primary conductive rod 6, the magnetic fluxes in the core 31 and the core 32 of the core coil 3 are not changed, and thus the secondary winding does not generate a current, and the current value of the primary winding cannot be measured by the secondary winding. Two secondary coil circuits are formed in parallel using the auxiliary ac power supply 14, using rectifier diodes. During each half cycle of auxiliary ac power supply 14, the core in one of the secondary windings is back-excited so that the magnetic flux in the core is zero, reaching a zero flux state, while the other secondary winding positively excites the core in the winding so that the magnetic flux in the core is greater. In one sinusoidal period of the auxiliary ac power supply 14, the coils on the two cores 31,32 alternately generate current and form a loop with the load resistor 16 due to the action of the rectifier diode, 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 (7)
1. The 150kV 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, and is characterized in that a ground potential shielding cylinder is arranged in the high-voltage shell, three 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 each iron core; the base is provided with circuit modules correspondingly connected with three groups of independent iron core coils, the iron core coils are connected with the corresponding circuit modules through cables, the insulating sleeve is internally provided with a lead tube, one end of the lead tube is connected with the ground potential shielding cylinder, the other end of the lead tube stretches into the base, and the cables penetrate through the lead tube; the high-voltage shell is connected with a horizontal conducting rod in a penetrating way, 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 circuit module comprises an auxiliary alternating current power supply, a rectifying diode D1, a rectifying diode D2, a rectifying diode D3, a rectifying diode D4, a demagnetization resistor and a load resistor, wherein the rectifying diode D1 and the rectifying diode D2 are connected in parallel between two corresponding terminals of coils of two iron cores, the rectifying diode D3 and the rectifying diode D4 are connected in parallel between the other two corresponding terminals of the coils of the two iron cores in a same direction, and the load resistor is connected in parallel with the rectifying diodes D3 and D4; the two ends of the auxiliary alternating current power supply are respectively connected with the junction points of the rectifying diode D1 and the rectifying diode D2 and the junction points of the rectifying diode D3 and the rectifying diode D4, loops are respectively formed with the load resistors in one period of the auxiliary alternating current power supply, and the demagnetizing resistors are connected with the rectifying diodes D1 and D2 in parallel.
2. 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 the shielding cover, which is far away from the connecting 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.
3. The 150kV zero-flux direct current transformer of 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 guide tube.
4. The 150kV zero-flux direct current transformer according to claim 1, wherein a high-voltage shielding cover is arranged in the insulating sleeve, and the high-voltage shielding cover is sleeved outside the lead tube.
5. The 150kV zero-flux direct current transformer of claim 1, wherein the high voltage housing has a recess machined in an inner bottom surface.
6. The 150kV zero-flux direct current transformer according to claim 1, wherein the base is provided with a terminal protection box, the cable is connected to the terminal protection box through a lead tube, and the terminal protection box is connected to a circuit module.
7. A 150kV zero-flux dc current transformer according to claim 1, wherein the core is made of permalloy thin strip coil.
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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111441968.4A CN114113737B (en) | 2021-11-30 | 2021-11-30 | 150kV zero-flux direct current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114113737A CN114113737A (en) | 2022-03-01 |
| CN114113737B true CN114113737B (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111441968.4A Active CN114113737B (en) | 2021-11-30 | 2021-11-30 | 150kV zero-flux direct current transformer |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256894B (en) * | 2007-12-29 | 2011-10-26 | 武汉格蓝若光电互感器有限公司 | Novel high voltage independent electronic type current mutual inductor |
| CN102496446B (en) * | 2011-11-29 | 2014-04-16 | 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 |
| DE102015214043A1 (en) * | 2015-07-24 | 2016-06-02 | Siemens Aktiengesellschaft | Zero flux current transformer |
| CN106771533B (en) * | 2017-03-15 | 2019-05-10 | 南京航空航天大学 | A kind of alternating 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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2021
- 2021-11-30 CN CN202111441968.4A patent/CN114113737B/en active Active
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| CN114113737A (en) | 2022-03-01 |
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