CN201298441Y - Voltage stabilizing transformer - Google Patents
Voltage stabilizing transformer Download PDFInfo
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- CN201298441Y CN201298441Y CNU2008201734483U CN200820173448U CN201298441Y CN 201298441 Y CN201298441 Y CN 201298441Y CN U2008201734483 U CNU2008201734483 U CN U2008201734483U CN 200820173448 U CN200820173448 U CN 200820173448U CN 201298441 Y CN201298441 Y CN 201298441Y
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Abstract
The utility model relates to a voltage stabilizing transformer with a structure that a plurality of primary windings or secondary windings are arranged on the same one-phase iron core magnetic column. One group of same ends of all the windings on the one-phase iron core magnetic column are connected together and led out by leads, the other ends of all the windings are respectively connected with one end of one normally-opened or normally-closed contact of a switching element, and the other ends of the normally-opened or normally-closed contacts of the switching element are connected together and led out by leads; the leads leading out of the ends of the primary windings are connected with a power supply, and the leads leading out of the ends of the secondary windings are connected with a load; the load is connected in parallel with the primary windings; the secondary windings are connected with a voltage detecting circuit; and the voltage detecting circuit automatically switches all the contacts to change the parallel connection relation of primary windings or secondary windings according to the measured voltage and the set value.
Description
Affiliated technical field
The utility model relates to a kind of transformer that can stablize the secondary winding output voltage, especially with a plurality of windings on the magnetic post same mutually unshakable in one's determination or the secondary winding transformer of stablizing the secondary winding output voltage of using independent or in parallel.
Background technology
At present, known transformer is by iron core, once form with secondary winding, once or secondary winding can form by a plurality of windings in series, available voltage regulator switching branch joint changes the secondary winding output voltage, this voltage regulating mode voltage regulator price is higher, pressure regulation speed is slower; China's 02135780.3 patent of invention proposes a kind of by the transformer of realizing voltage stabilizing in parallel of two secondary winding on the main magnetic post of same iron core, but it is better that the output voltage that this transformer causes load variations changes voltage regulation result, and mains voltage variations is not had voltage regulation result.
Summary of the invention
Existing mains voltage variations is not had the deficiency of voltage regulation result in order to overcome by two secondary winding parallel connections on the described same core limb of slower, Chinese 02135780.3 patent of transformer pressure regulation speed of voltage regulator changing-over series connection winding tap, the utility model proposes a kind of on same core limb, be equipped with once a plurality of or secondary winding, each once or secondary winding can by switch element often opening or normally-closed contact switches that relation in parallel changes and the transformer of stable secondary winding output voltage.
The technical scheme that its technical problem that solves the utility model adopts
Once several or secondary winding is installed on the same iron core column of transformer, on the same iron core column each once or one group of end of the same name of secondary winding all link together and draw with a lead, on the same iron core column each once or the other end of secondary winding connect often opening or normally-closed contact of a switch element separately respectively, each is often opened or the other end of normally-closed contact all links together and draws with another root lead; The shunt voltage instrument transformer winding on load or power supply, the secondary winding of voltage transformer inserts voltage detecting circuit, voltage detecting circuit according to measured voltage swing switching different once or secondary winding connect often opens or normally-closed contact changes described winding relation in parallel, stablize the secondary winding output voltage.
If 2 windings and 2 secondary winding have been installed on the same iron core column of transformer, 2 independent outputs of secondary winding can obtain 2 kinds of different output voltages, 2 secondary winding outputs in parallel can obtain a kind of output voltage, can obtain 3 kinds of different output voltages altogether so when a winding is constant, change secondary winding relation in parallel, identical reason changes winding relation in parallel when the transformer secondary winding is constant can obtain 3 kinds of different output voltage ratios altogether, and the parallel connection that changes winding and secondary winding concerns can obtain 9 kinds of different output voltages at most.
When once a plurality of or secondary winding parallel connection, because of once a plurality of or secondary winding are relations in parallel, drop into excision once or secondary winding neither can make the interruption that powers to the load, also can not cause once or secondary winding each other or short circuit own, so directly switching is once or secondary winding.When a high-voltage secondary winding on the same core limb is in parallel with a low pressure secondary winding, there is an electric current to flow into the low pressure secondary winding from the high-voltage secondary winding, because of the number of turn of high-voltage secondary winding the number of turn more than the low pressure secondary winding, the magnetic flux direction that the electric current of high and low pressure secondary winding internal flow produces in the transformer magnetic post of place is opposite with main magnetic flux direction in the described magnetic post, main magnetic flux descends in the described magnetic post unshakable in one's determination, and the high-voltage secondary winding voltage descends; When high and low pressure secondary winding terminal voltage in parallel balance, low pressure secondary winding internal emf direction flows into low pressure secondary winding current opposite in direction, low pressure secondary winding both end voltage is fallen on internal emf and internal driving, when high and low pressure secondary winding floating voltage differs when not being very big, high and low pressure secondary winding internal flow electric current can be very not big, and it is less to survey this electric current.
When the winding of a multiturn on the same core limb is in parallel with a few winding of circle, because of multiturn is a supply voltage with few winding shunt voltage of circle, there is not electric current between multiturn and few winding of circle, when multiturn and few winding of circle when mutually identical, it is identical with the direction that few circle once winding current produces magnetic flux to flow into multiturn, secondary winding voltage is the highest when multiturn is in parallel with few winding of circle, secondary winding voltage is inferior high when winding of a winding disconnection multiturn of circle is lacked in access, and secondary winding voltage is minimum when winding of circle is lacked in a winding disconnection of access multiturn.
Because of when a plurality of secondary winding are in parallel, each secondary winding in parallel is the no-output electric current all, and the electric current that power supply flows into a winding only is used for a winding excitation and compensates iron loss and the copper loss that each secondary winding internal flow electric current in parallel causes.
Secondary winding in parallel has voltage regulation result to the load voltage variation that load variations causes when a plurality of secondary winding are in parallel, principle of stabilized voltage is: the magnetic flux that 1. flows into the generation of low pressure secondary winding electric current is identical with the direction of main magnetic flux in the same magnetic post unshakable in one's determination, as long as high and low pressure secondary winding shunt voltage is higher than low pressure secondary winding internal emf, flow into the magnetic flux that low pressure secondary winding electric current produces and just main flux in the same magnetic post unshakable in one's determination is measured booster action, main magnetic flux just is higher than in the magnetic post unshakable in one's determination only secondary main magnetic flux in the iron core magnetic post when the ancestral; 2. work as high and low pressure secondary winding shunt voltage and be higher than low pressure secondary winding internal emf, when main magnetic flux descends in load increase, the magnetic post unshakable in one's determination, induced electromotive force in the low pressure secondary winding descends, big when the current ratio low pressure secondary winding internal induction electromotive force that flows into the low pressure secondary winding is not descended, the low pressure secondary winding is big when the booster action of main magnetic flux in the magnetic post unshakable in one's determination is not descended than low pressure secondary winding internal induction electromotive force; 3. when high and low pressure secondary winding shunt voltage is lower than low pressure secondary winding internal emf, load increase, the electric current of offered load is provided jointly by the high and low pressure secondary winding, and the slippage of voltage was lacked when high and low pressure secondary winding shunt voltage slippage was than secondary winding only when load variations was identical.
When switching once with the switch element normally opened contact or secondary winding when in parallel,, can interrupt powering to load if the control circuit fault causes the normally adhesive of switch element normally opened contact; Do not interrupt when guaranteeing the control circuit fault to the load power supply, the normally closed main contacts of available switch element switches once or the parallel connection of secondary winding.
The beneficial effects of the utility model
Can adjust automatically because of the secondary winding output voltage of loading or power source change causes changes, pressure regulation speed is fast, and the load voltage variation that when a plurality of secondary winding are in parallel load variations is caused has the automatic voltage regulation effect; When normally closed main contacts switches once or secondary winding can keep when in parallel powering to load under the control circuit fault and do not interrupt with switch element.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is have two secondary winding single-phase transformer circuit and a magnetic circuit schematic diagram of the present utility model;
Fig. 2 is first embodiment schematic diagram with two secondary winding single-phase transformers of the present utility model;
Fig. 3 is the load variations automatic voltage regulation feedback procedure figure with two secondary winding single-phase transformers of the present utility model;
Fig. 4 is the load variations automatic voltage regulation empirical curve with two secondary winding single-phase transformers of the present utility model;
Fig. 5 is second embodiment schematic diagram with three secondary winding single-phase transformers of the present utility model;
Fig. 6 is the 3rd an embodiment schematic diagram with two secondary winding three-phase transformers of the present utility model;
Fig. 7 is the 4th an embodiment schematic diagram with three secondary winding three-phase transformers of the present utility model;
Fig. 8 is the 5th an embodiment schematic diagram with three-phase transformer of two windings and two secondary winding of the present utility model.
In Fig. 1,2,1. primary power source voltage, 2. a winding, 3. iron core main magnetic circuit, 4. main flux in the iron core, 5. secondary winding 1,6. load, 7. secondary winding 2,8. voltage transformer, 9. voltage detecting circuit, 10. switch element is often opened or the normally-closed contact control circuit, 11. secondary winding 1 is often opened or normally-closed contact, 12. secondary winding 2 are often opened or normally-closed contact.
In Fig. 5,1 ~ 12 with Fig. 1 in identical .13. secondary winding 3,14. secondary winding 3 often open or normally-closed contact.
In Fig. 6,1. three phase mains primary voltage, 2. winding of three-phase transformer, 3. three-phase transformer iron core main magnetic circuit, 4. main flux in the three-phase transformer iron core, 5. the three-phase transformer secondary winding 1,6. threephase load, 7. the three-phase transformer secondary winding 2,8. voltage transformer, 9. voltage detecting circuit, 10. switch element is often opened or the normally-closed contact control circuit, 11. three-phase transformer secondary winding 1 is often left or normally-closed contact, 12. three-phase transformer secondary winding 2 are often opened or normally-closed contact.
In Fig. 7,1 ~ 12 with Fig. 6 in identical .13. three-phase transformer secondary winding 3,14. three-phase transformer secondary winding 3 often open or normally-closed contact.
In Fig. 8,1. three phase mains primary voltage, 2. winding 1 of three-phase transformer, 3. three-phase transformer iron core main magnetic circuit, 4. main flux in the three-phase transformer iron core, 5. winding 2 of three-phase transformer, 6. threephase load, 7. the three-phase transformer secondary winding 1,8. voltage transformer, 9. voltage detecting circuit, 10. switch element is often opened or the normally-closed contact control circuit, and winding 2 of 11. three-phase transformers is often opened or normally-closed contact, 12. three-phase transformer secondary winding 1 is often left or normally closed main contacts, 13. three-phase transformer secondary winding 2,14. three-phase transformer secondary winding 2 are often left or normally-closed contact, winding 1 of 15. three-phase transformers is often opened or normally-closed contact.
Embodiment
In Fig. 1, single-phase transformer secondary winding 2 (7) is drawn with one group of end leads for connecting of the same name of secondary winding 1 (5), the other end of secondary winding 2 (7) is connected with Chang Kai or normally-closed contact (11), the other end of secondary winding 1 (5) is connected with Chang Kai or normally-closed contact (12), often open or the other end of normally-closed contact (11) and (12) is drawn with lead, draw for two to be output voltage v between the lead
2A winding of voltage transformer (8) is connected on two and draws between the lead, the secondary winding of voltage transformer (8) inserts voltage detecting circuit (9), the output of voltage detecting circuit (9) inserts switch element and often opens or normally-closed contact control circuit (10), switch element is often opened or main contacts (11) is often opened in normally-closed contact control circuit (10) control and (12) open and close, often open or normally-closed contact (11), (12) can be respectively with a single-phase contactor, relay, the inverse parallel of bidirectional thyristor or two unidirectional thyristors, Chang Kai or normally-closed contact (11) and (12) all are in off-state.
In Fig. 2 embodiment, to draw for two and insert load (6) Z between the lead, Chang Kai or normally-closed contact (11) and (12) all are in closure state.
Fig. 3 is the feedback regulation process of Fig. 2 embodiment when high and low pressure winding shunt voltage is higher than low pressure winding internal emf, wherein φ
1Be N
1Magnetic flux, φ
2Be N
2Magnetic flux, φ
3Be N
3Magnetic flux, φ be unshakable in one's determination in main magnetic flux.
The curve of Fig. 4 (1), (2), (3) represent respectively the experiment obtain only by high pressure winding N
2Output, high pressure winding N
2With low pressure winding N
3Parallel connection is exported and N
3Adopt thin wire, the N of high impedance
3When adopting low-impedance heavy gauge wire, the corresponding relation that output voltage changes with load impedance, V
20Be high pressure winding N
2Floating voltage, V
30Be low pressure winding N
3Floating voltage, V
2Be high and low pressure winding N
2, N
3Back in parallel floating voltage.
In Fig. 5 embodiment, single-phase transformer secondary winding 2 (7), secondary winding 1 (5) are connected with one group of end of the same name of secondary winding 3 (13) and draw with lead; The other end of secondary winding 2 (7) is connected with Chang Kai or normally-closed contact (11), the other end of secondary winding 1 (5) is connected with Chang Kai or normally-closed contact (12), the other end of secondary winding 3 (13) is connected with Chang Kai or normally-closed contact (14), often open or normally-closed contact (11), (12) are drawn with lead with the other end of (14), draw for two to be output voltage v between the lead
2A winding of voltage transformer (8) is connected on two and draws between the lead, the secondary winding of voltage transformer (8) inserts voltage detecting circuit (9), the output of voltage detecting circuit (9) inserts switch element and often opens or normally-closed contact control circuit (10), switch element is often opened or normally-closed contact control circuit (10) control is often opened or normally-closed contact (11), (12) and (14) open and close, often open or normally-closed contact (11), (12) and (14) can each with a single-phase contactor, relay, the inverse parallel of bidirectional thyristor or two unidirectional thyristors, Chang Kai or normally-closed contact (11) and (12) all are in off-state.
In Fig. 6 embodiment, the Y-connection of three-phase transformer secondary winding, secondary winding 2 (7) on each magnetic post of three-phase transformer is drawn with one group of end leads for connecting of the same name of secondary winding 1 (5), the other end of secondary winding 2 (7) is connected with Chang Kai or normally-closed contact (11), the other end of secondary winding 1 (5) is connected with Chang Kai or normally-closed contact (12), often open or the other end of normally-closed contact (11) and (12) is drawn with lead, it is a phase output voltage v that on the same magnetic post two draw between the lead
2A winding of voltage transformer (8) be connected on one mutually last two draw between the lead, the secondary winding of voltage transformer (8) inserts voltage detecting circuit (9), the output of voltage detecting circuit (9) inserts switch element and often opens or normally-closed contact control circuit (10), and switch element is often opened or normally-closed contact control circuit (10) control is respectively often opened mutually or normally-closed contact (11) and (12) switching; Often open or normally-closed contact (11) opens and closes simultaneously for three, often open or normally-closed contact (12) opens and closes simultaneously for three, three often open main contacts (11) and three often open main contacts (12) can each inverse parallel with a three-phase contactor, three phase relaies, three-phase bidirectional thyristor or three groups of two unidirectional thyristors, Chang Kai or normally-closed contact (11) and (12) all are in off-state.
In Fig. 7 embodiment, the Y-connection of three-phase transformer secondary winding, the secondary winding 2 (7) on the three-phase transformer one phase magnetic post, secondary winding 1 (5) are connected with one group of end of the same name of secondary winding 3 (13) and draw with lead; The other end of secondary winding 2 (7) is connected with Chang Kai or normally-closed contact (11) on the one phase magnetic post, the other end of secondary winding 1 (5) is connected with Chang Kai or normally-closed contact (12), the other end of secondary winding 3 (13) is connected with Chang Kai or normally-closed contact (14), often open or normally-closed contact (11), (12) are drawn with lead with the other end of (14), two secondary winding are drawn and are this phase output voltage v between the lead on the phase magnetic post
2A winding of voltage transformer (8) is connected on two of phase secondary winding and draws between the lead, the secondary winding of voltage transformer (8) inserts voltage detecting circuit (9), the output of voltage detecting circuit (9) inserts switch element and often opens or normally-closed contact control circuit (10), switch element often open or normally-closed contact control circuit (10) control each often open mutually or normally-closed contact (11), (12) and (14) switching; Often open or normally-closed contact (11), three are often opened or normally-closed contact (12) and three often open or normally-closed contact (14) opens and closes respectively simultaneously for three, often open or normally-closed contact (11), three are often opened or normally-closed contact (12) and three often open or normally-closed contact (14) can each inverse parallel with a three-phase contactor, three phase relaies, three-phase bidirectional thyristor or three groups of two unidirectional thyristors for three, often open or normally-closed contact (11), (12) and (14) all are in off-state for three.
In Fig. 8 embodiment, three-phase transformer all is Y-connection with secondary winding once, and the winding 1 (2) on the three-phase transformer one phase magnetic post is connected with one group of end of the same name of a winding 2 (5) and draws with lead; The last winding 1 (2) of one phase magnetic post is connected with Chang Kai or normally-closed contact (15), the other end of a winding 2 (5) is connected with Chang Kai or normally-closed contact (11), the other end of a winding 1 (2) is connected with Chang Kai or normally-closed contact (15), often open or the other end of normally-closed contact (11), (15) is drawn with lead, two windings are drawn and are this phase input voltage v between the lead on the phase magnetic post
1Secondary winding 1 (7) on the three-phase transformer one phase magnetic post, be connected with one group of end of the same name of secondary winding 2 (13) and draw with lead; Secondary winding 1 (7) is connected with Chang Kai or normally-closed contact (12) on the one phase magnetic post, the other end of secondary winding 2 (13) is connected with Chang Kai or normally-closed contact (14), the other end of secondary winding 1 (5) is connected with Chang Kai or normally-closed contact (12), often open or the other end of normally-closed contact (12), (14) is drawn with lead, two secondary winding are drawn and are this phase output voltage v between the lead on the phase magnetic post
2A winding of voltage transformer (8) is connected on two of phase secondary winding and draws between the lead, the secondary winding of voltage transformer (8) inserts voltage detecting circuit (9), the output of voltage detecting circuit (9) inserts switch element and often opens or normally-closed contact control circuit (10), switch element often open or normally-closed contact control circuit (10) control each often open mutually or normally-closed contact (11), (12), (14) and (15) switching; Often open or normally-closed contact (11), three are often opened or normally-closed contact (12), three are often opened or normally-closed contact (14) and three often open or normally-closed contact (15) opens and closes respectively simultaneously for three, often open or normally-closed contact (11), three are often opened or normally-closed contact (12), three are often opened or normally-closed contact (14) and three often open or normally-closed contact (15) can each inverse parallel with a three-phase contactor, three phase relaies, three-phase bidirectional thyristor or three groups of two unidirectional thyristors for three, often open or normally-closed contact (11), (12), (14) and (15) all are in off-state for four.
Claims (3)
1. voltage stabilizing transformer that once a plurality of or secondary winding are housed on magnetic post same mutually unshakable in one's determination, it is characterized in that: the quantity of a winding of installing on each iron core column is identical, and the umber of turn in same position place is identical on each iron core column; The quantity of the secondary winding of installing on each iron core column is identical, and the same position place secondary winding number of turn is identical on each iron core column; One group of end of the same name of each winding all links together and draws with lead on the magnetic post same mutually unshakable in one's determination, the other end of each winding connects often opening or normally-closed contact of a switch element separately respectively on the described same magnetic post mutually unshakable in one's determination, on the described same magnetic post mutually unshakable in one's determination each winding often open or the other end of normally-closed contact all links together and draws with lead in addition, connect power supply between the different lead-out wires of the last winding of a magnetic post mutually unshakable in one's determination; The lead-out wire of the last winding of three-phase transformer three-phase magnetic post unshakable in one's determination can be connected into star, also can be connected into triangle, and described star or leg-of-mutton three-phase are drawn and connect three phase mains; One group of end of the same name of each secondary winding all links together and draws with lead on the magnetic post same mutually unshakable in one's determination, the other end of each secondary winding connects often opening or normally-closed contact of a switch element separately respectively on the described same magnetic post mutually unshakable in one's determination, on the described same magnetic post mutually unshakable in one's determination each secondary winding often open or the other end of normally-closed contact all links together and draws with lead in addition, connect load between the different lead-out wires of secondary winding on the magnetic post mutually unshakable in one's determination; The lead-out wire of secondary winding can be connected into star on the three-phase transformer three-phase magnetic post unshakable in one's determination, also can be connected into triangle, and star or leg-of-mutton three-phase lead-out wire connect threephase load; Winding of shunt voltage instrument transformer on transformer load, described voltage transformer secondary winding inserts voltage detecting circuit, relatively the described transformer of back automatic switching is once or often the opening or normally-closed contact of secondary winding according to measured magnitude of voltage and set point for described voltage detecting circuit, change described transformer once or the secondary winding parallel way, stablize the secondary winding output voltage.
2. a kind of voltage stabilizing transformer that once a plurality of or secondary winding are housed on magnetic post same mutually unshakable in one's determination according to claim 1, it is characterized in that: a plurality of windings that are equipped with on the described same magnetic post mutually unshakable in one's determination can be separately, two parallel connections or a plurality of parallel connection are connected with power supply, and a plurality of secondary winding can be separately, two parallel connections or a plurality of parallel connection be to the load power supply.
3. a kind of voltage stabilizing transformer that once a plurality of or secondary winding are housed on magnetic post same mutually unshakable in one's determination according to claim 1 is characterized in that: described switch element is single-phase or the inverse parallel of three-phase contactor, single-phase or three phase relaies, single-phase or three-phase bidirectional thyristor, single-phase or two unidirectional thyristors of three-phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201734483U CN201298441Y (en) | 2008-10-27 | 2008-10-27 | Voltage stabilizing transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201734483U CN201298441Y (en) | 2008-10-27 | 2008-10-27 | Voltage stabilizing transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201298441Y true CN201298441Y (en) | 2009-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201734483U Expired - Fee Related CN201298441Y (en) | 2008-10-27 | 2008-10-27 | Voltage stabilizing transformer |
Country Status (1)
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| CN (1) | CN201298441Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700473A (en) * | 2013-12-12 | 2014-04-02 | 华为技术有限公司 | Coupling inductor and power converter |
| US9601262B2 (en) | 2013-12-12 | 2017-03-21 | Huawei Technologies Co., Ltd. | Coupled inductor and power converter |
| CN107785873A (en) * | 2017-12-06 | 2018-03-09 | 珠海格力电器股份有限公司 | Voltage protection circuit, method and the Switching Power Supply of Switching Power Supply |
| CN108777220A (en) * | 2018-05-28 | 2018-11-09 | 台达电子工业股份有限公司 | Magnetic element and switching power unit |
| CN117038261A (en) * | 2023-08-21 | 2023-11-10 | 广东四会互感器厂有限公司 | Voltage transformer for gas-insulated high-voltage station and manufacturing process thereof |
-
2008
- 2008-10-27 CN CNU2008201734483U patent/CN201298441Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700473A (en) * | 2013-12-12 | 2014-04-02 | 华为技术有限公司 | Coupling inductor and power converter |
| US9601262B2 (en) | 2013-12-12 | 2017-03-21 | Huawei Technologies Co., Ltd. | Coupled inductor and power converter |
| CN103700473B (en) * | 2013-12-12 | 2017-11-28 | 华为技术有限公司 | Coupling inductance and power inverter |
| CN107785873A (en) * | 2017-12-06 | 2018-03-09 | 珠海格力电器股份有限公司 | Voltage protection circuit, method and the Switching Power Supply of Switching Power Supply |
| CN107785873B (en) * | 2017-12-06 | 2023-07-04 | 珠海格力电器股份有限公司 | Voltage protection circuit and method of switching power supply and switching power supply |
| CN108777220A (en) * | 2018-05-28 | 2018-11-09 | 台达电子工业股份有限公司 | Magnetic element and switching power unit |
| CN117038261A (en) * | 2023-08-21 | 2023-11-10 | 广东四会互感器厂有限公司 | Voltage transformer for gas-insulated high-voltage station and manufacturing process thereof |
| CN117038261B (en) * | 2023-08-21 | 2024-02-02 | 广东四会互感器厂有限公司 | Voltage transformer for gas-insulated high-voltage station and manufacturing process thereof |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090826 Termination date: 20091127 |