CN117117794A - Transformer pre-magnetizing circuit and control method thereof - Google Patents
Transformer pre-magnetizing circuit and control method thereof Download PDFInfo
- Publication number
- CN117117794A CN117117794A CN202311319969.0A CN202311319969A CN117117794A CN 117117794 A CN117117794 A CN 117117794A CN 202311319969 A CN202311319969 A CN 202311319969A CN 117117794 A CN117117794 A CN 117117794A
- Authority
- CN
- China
- Prior art keywords
- transformer
- contactor
- controller
- module
- alternating current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 238000001914 filtration Methods 0.000 claims abstract description 25
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 claims description 24
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
Abstract
The invention discloses a transformer pre-magnetizing circuit and a control method thereof, wherein a controller, a first contactor, a second contactor, a conversion module, a filtering module, an alternating current breaker and a transformer are arranged in the circuit, the controller receives closing instructions of the first contactor and the second contactor and sends a starting command to the conversion module, the starting command is processed by the filtering module to supply power to the transformer, when the controller detects that voltage phases at two ends of the alternating current breaker are the same, the controller sends a closing signal to the alternating current breaker when judging that the amplitude difference corresponding to the voltage phases is smaller than a preset voltage, when the controller receives a feedback signal of the alternating current breaker and changes from 0 to 1, the controller stops sending a driving signal to an IGBT module, and the controller controls the first contactor and the second contactor to be disconnected to finish pre-magnetizing of the transformer, so that current impact caused by the transformer when the alternating current breaker is closed is reduced, the service life of the alternating current breaker is prolonged, and the working stability of the transformer pre-magnetizing circuit is improved.
Description
Technical Field
The invention belongs to the technical field of transformers, and particularly relates to a transformer pre-magnetizing circuit and a control method thereof.
Background
When the voltage on the alternating current side of the transformer is closed, a current surge is generated, and the current surge can influence the easy tripping of the alternating current end breaker and can influence the service life of the alternating current end breaker. In general, the transformer is pre-magnetized, an RL series circuit is formed by a resistor and a winding inductance of the transformer, the resistor and the inductance are divided, and the resistor is used for current limiting, so that current impact is reduced. However, the resistor is designed according to the winding inductance of the transformer, and if the winding inductance of the transformer is large, the current impact during power-on is small, so that a pre-magnetizing circuit is not required to be added; if the winding inductance of the transformer is smaller, the selected resistance value is smaller, so that the voltage obtained by dividing the transformer is higher, the impulse current of switching on the alternating current side breaker is smaller, but the power requirement of the resistor is larger, and the resistor is unfavorable for the resistor type selection. Accordingly, it is desirable to provide a device that reduces current surge on a transformer when an ac circuit breaker is closed.
Disclosure of Invention
In view of the above, the present invention provides a transformer pre-magnetizing circuit and a control method thereof, which reduce current impact caused by a transformer when an ac breaker is closed by controlling working states of a first contactor, a second contactor, the ac breaker and an ACAC module at an ac side, and is implemented by adopting the following technical scheme.
In a first aspect, the invention provides a transformer pre-magnetizing circuit, which comprises a controller, a first contactor, a second contactor, a conversion module, a filtering module, an alternating current breaker and a transformer, wherein the first contactor and the alternating current breaker are connected with the controller, the first contactor is connected with the conversion module, the conversion module is connected with the filtering module, the filtering module is connected with the second contactor, one end of the transformer is connected with the alternating current breaker and the controller, the other end of the transformer is connected with the second contactor, and the controller receives a starting command from the first contactor and the second contactor and sends the starting command to the conversion module to supply power to the transformer through the processing of the filtering module;
when the controller detects that the voltage phases at two ends of the alternating current circuit breaker are the same and judges that the amplitude difference corresponding to the voltage phases is smaller than a preset voltage, the controller sends a closing signal to the alternating current circuit breaker;
when the controller receives that the feedback signal of the alternating current breaker is changed from 0 to 1, the controller stops sending a driving signal to an IGBT module connected with the transformer pre-magnetizing circuit, and the controller controls the first contactor and the second contactor to be disconnected so as to finish the transformer pre-magnetizing.
As a further improvement of the technical scheme, the filtering module comprises an inductance group and a capacitance group, wherein the inductance group is three inductances which are connected in parallel with the conversion module, or the inductance group is three single-phase inductances, the capacitance group comprises three capacitances which are connected in parallel, and the connection mode of the capacitance group is star-shaped or triangular.
As a further improvement of the above technical solution, each of the capacitors is connected in parallel between every two of the inductors.
As a further improvement of the technical scheme, the sine wave filter is formed by the inductance group and the capacitance group to obtain sine wave inductance to supply power to the transformer.
As a further improvement of the above technical solution, the conversion module is an ACAC module, and the output voltage of the ACAC module increases with the start time.
As a further improvement of the technical scheme, the ACAC module is a converter with adjustable phase and amplitude.
As a further improvement of the above technical solution, the controller is provided with a first switch, a second switch and a third switch corresponding to the first contactor, the ac breaker and the second contactor, respectively.
In a second aspect, the present invention further provides a control method for a transformer pre-magnetizing circuit, which is applied to the transformer pre-magnetizing circuit, and includes the following steps:
acquiring closing instructions of the first contactor and the second contactor, sending a starting command to a conversion module by a controller, and processing the starting command into sine wave voltage by a filtering module to supply power to a transformer, wherein the conversion module is an ACAC module;
when the controller detects that the voltage phases at two ends of the alternating current circuit breaker are the same and judges that the amplitude difference corresponding to the voltage phases is smaller than a preset voltage, the controller sends a closing signal to the alternating current circuit breaker, wherein the preset voltage is 20V;
when the controller receives that the feedback signal of the alternating current breaker is changed from 0 to 1, the controller stops sending a driving signal to an IGBT module connected with the transformer pre-magnetizing circuit, and the controller controls the first contactor and the second contactor to be disconnected so as to finish the transformer pre-magnetizing.
The invention provides a transformer pre-magnetizing circuit and a control method thereof, wherein a controller, a first contactor, a second contactor, a conversion module, a filtering module, an alternating current breaker and a transformer are arranged in the circuit, the controller receives a starting command sent by the first contactor and the second contactor to the conversion module and is processed by the filtering module to supply power to the transformer, when the controller detects that the voltage phases at two ends of the alternating current breaker are the same, the controller sends a closing signal to the alternating current breaker when judging that the amplitude difference corresponding to the voltage phases is smaller than a preset voltage, when the controller receives a feedback signal of the alternating current breaker and changes from 0 to 1, the controller stops sending a driving signal to an IGBT module, the controller controls the first contactor and the second contactor to be opened to finish the transformer pre-magnetizing, and the working states of the first contactor, the second contactor, the alternating current breaker and the ACAC module at the alternating current side are controlled to reduce current impact brought by the transformer when the alternating current breaker is closed, the service life of the alternating current breaker is prolonged, and the working stability of the transformer pre-magnetizing circuit is also improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a transformer pre-magnetizing circuit of the present invention;
FIG. 2 is a schematic diagram of a transformer pre-magnetizing circuit of the present invention;
fig. 3 is a flowchart of a control method of the transformer pre-magnetizing circuit of the present invention.
The main reference numerals are as follows:
100-a controller; 110-a first contactor; 120-a second contactor; 130-a conversion module; 140-a filtering module; 150-an alternating current breaker; 160-a transformer; 170-inductance group; 180-capacitor bank; 190-a first switch; 200-a second switch; 210-third switch.
Description of the embodiments
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
Referring to fig. 1 and 2, the present invention provides a transformer pre-magnetizing circuit, which includes a controller 100, a first contactor 110, a second contactor 120, a conversion module 130, a filtering module 140, an ac breaker 150, and a transformer, wherein the first contactor 110, the ac breaker 150 are connected to the controller 100, the first contactor 110 is connected to the conversion module 130, the conversion module 130 is connected to the filtering module 140, the filtering module 140 is connected to the second contactor 120, one end of the transformer 160 is connected to the ac breaker 150 and the controller 100, the other end of the transformer 160 is connected to the second contactor 120, wherein the controller 100 receives the closing command of the first contactor 110 and the second contactor 120, sends a start command to the conversion module 130, and processes the start command to supply power to the transformer 160 through the filtering module 140;
when the controller 100 detects that the voltage phases at two ends of the ac circuit breaker 150 are the same, and determines that the amplitude difference corresponding to the voltage phases is smaller than a preset voltage, the controller 100 sends a closing signal to the ac circuit breaker 150;
when the controller 100 receives the feedback signal of the ac breaker 150 from 0 to 1, the controller 100 stops transmitting a driving signal to the IGBT module connected to the transformer pre-magnetizing circuit, and the controller 100 controls the first contactor 110 and the second contactor 120 to be opened to complete the transformer 160 pre-magnetizing.
In this embodiment, the filtering module 140 includes an inductance group 170 denoted as L1 and a capacitance group 180 denoted as C1, where the inductance group 170 is three inductances connected in parallel to the conversion module 130, or the inductance group 170 is three single-phase inductances, the capacitance group 180 includes three capacitances connected in parallel, and the connection mode of the capacitance group 180 is star or triangle, and each capacitance is connected in parallel between every two inductances. The inductance group 170 and the capacitance group 180 form a sine wave filter to obtain a sine wave inductance to supply power to the transformer 160 denoted as T1, the conversion module 130 is an ACAC module, and the output voltage of the ACAC module increases with the starting time. The ACAC module is a phase and amplitude adjustable inverter, and the controller 100 is provided with a first switch 190, a second switch 200 and a third switch 210 corresponding to the first contactor 110 denoted KM1, the ac breaker 150 denoted QF1 and the second contactor 120 denoted KM2, respectively.
It should be noted that, the contactor cuts off the power supply of the ac or dc main circuit in the circuit rapidly to realize the start or stop of the operation of the device. The contactor can not only switch on and off the circuit, but also has the function of low-voltage release protection, can remotely operate and control electrical equipment, and can remotely display the working state. An ac circuit breaker is a switching device capable of closing, carrying and breaking a current under normal circuit conditions and closing, carrying and breaking a current under abnormal circuit conditions within a prescribed time. The main function of the alternating current circuit breaker is to control, i.e. to throw in or cut off part of the power equipment or lines and to protect according to the operation requirement. The types, parameters and the like of the first contactor 110 and the second contactor 120 are the same, the ACAC module is a three-phase ac-ac module, the transformer 160 is a device for changing ac voltage by using electromagnetic induction, the filtering module 140 is a sine filter formed by recording the inductance group 170 as L1 and the capacitance group 180 as C1, the sine filter changes the output voltage of the ACAC module into sine wave voltage to supply power to the transformer 160, and the ACAC module can set the starting time, i.e. the output voltage of the ACAC module can rise with a certain slope. The IGBT module is an insulated gate bipolar transistor, has the characteristics of simple conduction of a driving circuit, low resistance, high switching speed, easiness in driving and the like, and can be used for driving inductive loads such as coil windings, electromagnets and the like.
It should be understood that when the controller 100 detects that the voltage phases of the front and rear ends of the ac breaker 150 marked as QF1 are the same, and the amplitude difference is smaller than 20V, the controller 100 gives the ac breaker 150 a QF1 closing signal, when the controller 100 receives a feedback signal of the ac breaker 150 marked as QF1 changed from 0 to 1, the controller 100 stops sending the driving signal to the IGBTs VT1-VT3, simultaneously opens the contactors KM1, KM2, and completes the pre-magnetizing of the transformer. A pre-magnetizing transformer is a type of power transformer that is often used in power systems to provide a pre-magnetizing current to power equipment, the pre-magnetizing being the instant of energization, the need to instantaneously provide a magnetic field that updates saturation to form the instantaneous current required for a stable operating state in order to protect the transformer and power equipment. The principle of the pre-magnetizing transformer is that a high-impedance circuit is used as a magnetic field pre-charger of the transformer, the high-impedance circuit can be started to generate a magnetic field at first at the moment of power-on, pre-magnetizing current is provided for the transformer, and when the pre-magnetizing current reaches a required value, the pre-magnetizing circuit can be automatically cut off, so that the transformer enters a normal working state. By controlling the working states of the first contactor 110, the second contactor 120, the alternating current breaker 150 and the ACAC module at the alternating current side, current impact caused by the transformer 160 when the alternating current breaker 150 is switched on is reduced, the transformer pre-magnetizing circuit is simple in structure, the service life of the alternating current breaker 150 is prolonged, and the working stability of the transformer pre-magnetizing circuit is also improved.
Referring to fig. 3, the invention also provides a control method of the transformer pre-magnetizing circuit, which is applied to the transformer pre-magnetizing circuit and comprises the following steps:
s1: acquiring closing instructions of the first contactor and the second contactor, sending a starting command to a conversion module by a controller, and processing the starting command into sine wave voltage by a filtering module to supply power to a transformer, wherein the conversion module is an ACAC module;
s2: when the controller detects that the voltage phases at two ends of the alternating current circuit breaker are the same and judges that the amplitude difference corresponding to the voltage phases is smaller than a preset voltage, the controller sends a closing signal to the alternating current circuit breaker, wherein the preset voltage is 20V;
s3: when the controller receives that the feedback signal of the alternating current breaker is changed from 0 to 1, the controller stops sending a driving signal to an IGBT module connected with the transformer pre-magnetizing circuit, and the controller controls the first contactor and the second contactor to be disconnected so as to finish the transformer pre-magnetizing.
In this embodiment, the IGBT module is connected to the transformer pre-magnetizing circuit as a load, and the change of the feedback signal of the ac breaker from 0 to 1 indicates that the working state of the ac breaker is changed from open to closed, i.e. after the contacts of the ac breaker are closed. An ac circuit breaker is a circuit that turns on and off a line, and performs line protection including line overload protection, line short-circuit protection, and the like. The controller is used for controlling the starting and the cutting-off of the pre-magnetizing circuit, the pre-magnetizing circuit is in a cut-off state in a normal working state of the transformer, and the working state of the transformer is powered by a main power supply. When the transformer needs to be restarted, the controller can start the pre-magnetizing circuit to provide pre-magnetizing current for the transformer through the first contactor, the ACAC touch, the second contactor and the filtering module as a high-impedance circuit, the pre-magnetizing starting time is smaller than that of the transformer, otherwise, when the transformer is started, a magnetic field in a transformer of the transformer is lost in stability, large ripple current appears, and stable operation of the transformer is affected. The ACAC module can set the starting time, namely the output voltage can rise with a certain slope, so that the working stability of the transformer pre-magnetizing circuit is ensured.
The alternating-current side voltage firstly closes the contactors KM1 and KM2, and the controller starts a command for the ACAC module, and the command is changed into sine wave voltage to supply power for the transformer after passing through a sine wave filter consisting of L1 and C1. The ACAC module may set the start-up time, i.e. the output voltage may rise with a certain slope. When the controller detects that the voltage phases of the front end and the rear end of the alternating current breaker marked as QF1 are the same and the amplitude difference is smaller than 20V, the controller gives the alternating current breaker marked as QF1 closing signals, when the controller receives that the feedback signal of the alternating current breaker marked as QF1 is changed from 0 to 1, the controller stops sending driving signals to IGBTs VT1-VT3, meanwhile, the contactors KM1 and KM2 are disconnected, and the pre-magnetizing of the transformer is completed. The working states of the first contactor, the second contactor, the alternating current breaker and the ACAC module at the alternating current side are controlled to reduce current impact caused by the transformer when the alternating current breaker is switched on, the service life of the alternating current breaker is prolonged, the circuit structure is simple, and the working stability of the transformer pre-magnetizing circuit is also improved.
Any particular values in all examples shown and described herein are to be construed as merely illustrative and not a limitation, and thus other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (8)
1. The transformer pre-magnetizing circuit is characterized by comprising a controller, a first contactor, a second contactor, a conversion module, a filtering module, an alternating current breaker and a transformer, wherein the first contactor and the alternating current breaker are connected with the controller, the first contactor is connected with the conversion module, the conversion module is connected with the filtering module, the filtering module is connected with the second contactor, one end of the transformer is connected with the alternating current breaker and the controller, the other end of the transformer is connected with the second contactor, and the controller receives a starting command from the first contactor and the second contactor and processes the starting command to the conversion module through the filtering module to supply power to the transformer;
when the controller detects that the voltage phases at two ends of the alternating current circuit breaker are the same and judges that the amplitude difference corresponding to the voltage phases is smaller than a preset voltage, the controller sends a closing signal to the alternating current circuit breaker;
when the controller receives that the feedback signal of the alternating current breaker is changed from 0 to 1, the controller stops sending a driving signal to an IGBT module connected with the transformer pre-magnetizing circuit, and the controller controls the first contactor and the second contactor to be disconnected so as to finish the transformer pre-magnetizing.
2. The transformer pre-magnetizing circuit of claim 1, wherein the filtering module comprises an inductance group and a capacitance group, the inductance group is three inductances connected in parallel to the converting module, or the inductance group is three single-phase inductances, the capacitance group comprises three capacitances connected in parallel, and the connection mode of the capacitance group is star-shaped or triangular.
3. The transformer pre-magnetizing circuit of claim 2, wherein each of the capacitors is connected in parallel between each two of the inductors.
4. The transformer pre-magnetizing circuit of claim 2, wherein the inductor bank and the capacitor bank form a sine wave filter to obtain a sine wave inductance to power the transformer.
5. The transformer pre-magnetizing circuit of claim 1, wherein the conversion module is an ACAC module, and the ACAC module output voltage increases with start-up time.
6. A transformer pre-magnetizing circuit according to claim 3, characterized in that the ACAC module is a transformer with adjustable phase and amplitude.
7. The transformer pre-magnetizing circuit of claim 1, wherein the controller is provided with a first switch, a second switch and a third switch corresponding to the first contactor, the ac breaker and the second contactor, respectively.
8. The control method of the transformer pre-magnetizing circuit is applied to the transformer pre-magnetizing circuit and is characterized by comprising the following steps of:
acquiring closing instructions of the first contactor and the second contactor, sending a starting command to a conversion module by a controller, and processing the starting command into sine wave voltage by a filtering module to supply power to a transformer, wherein the conversion module is an ACAC module;
when the controller detects that the voltage phases at two ends of the alternating current circuit breaker are the same and judges that the amplitude difference corresponding to the voltage phases is smaller than a preset voltage, the controller sends a closing signal to the alternating current circuit breaker, wherein the preset voltage is 20V;
when the controller receives that the feedback signal of the alternating current breaker is changed from 0 to 1, the controller stops sending a driving signal to the IGBT module, and the controller controls the first contactor and the second contactor to be disconnected so as to complete pre-magnetizing of the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311319969.0A CN117117794B (en) | 2023-10-12 | 2023-10-12 | Transformer pre-magnetizing circuit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311319969.0A CN117117794B (en) | 2023-10-12 | 2023-10-12 | Transformer pre-magnetizing circuit and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117117794A true CN117117794A (en) | 2023-11-24 |
| CN117117794B CN117117794B (en) | 2024-02-27 |
Family
ID=88800346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311319969.0A Active CN117117794B (en) | 2023-10-12 | 2023-10-12 | Transformer pre-magnetizing circuit and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117117794B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4112286A (en) * | 1976-06-28 | 1978-09-05 | Firing Circuits, Inc. | Power circuit for induction heating |
| CN101075498A (en) * | 2007-04-13 | 2007-11-21 | 中国南车集团株洲电力机车研究所 | Method and device for inhibiting transformer no-load switchon surge |
| CN101702360A (en) * | 2009-11-10 | 2010-05-05 | 中国船舶重工集团公司第七一二研究所 | Pre-magnetizing device of power supply transformer and pre-magnetizing method thereof |
| CN102779612A (en) * | 2012-08-07 | 2012-11-14 | 泰州海田电气制造有限公司 | Pre-magnetizing device for main power supply transformer of electric power circuit |
| CN203278635U (en) * | 2013-05-14 | 2013-11-06 | 中国船舶重工集团公司第七一二研究所 | Precharging device having pre-magnetizing function |
| US20140035530A1 (en) * | 2011-04-18 | 2014-02-06 | Zehua Shao | Electric automobile pwm rectification and converting voltage/current pulse charging system |
| CN104034982A (en) * | 2014-06-19 | 2014-09-10 | 国家电网公司 | Electric energy quality harmonic disturbance source platform |
| CN106058939A (en) * | 2016-08-05 | 2016-10-26 | 北京千驷驭电气有限公司 | Closing control system and inrush current free control method of transformer |
| CN205900232U (en) * | 2016-08-09 | 2017-01-18 | 上海振华重工(集团)股份有限公司 | Bank bridge main transformer's magnetization device in advance |
| CN109448952A (en) * | 2018-12-19 | 2019-03-08 | 卧龙电气南阳防爆集团股份有限公司 | A kind of low pressure pre-magnetizing system and method for high-power fairing |
| CN115224665A (en) * | 2022-07-20 | 2022-10-21 | 安徽合凯电气科技股份有限公司 | Pre-charging magnetic type transformer inrush current suppression device |
| CN115719941A (en) * | 2022-12-02 | 2023-02-28 | 湖北亿纬动力有限公司 | Excitation inrush current suppression device and method and ship energy storage system |
-
2023
- 2023-10-12 CN CN202311319969.0A patent/CN117117794B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4112286A (en) * | 1976-06-28 | 1978-09-05 | Firing Circuits, Inc. | Power circuit for induction heating |
| CN101075498A (en) * | 2007-04-13 | 2007-11-21 | 中国南车集团株洲电力机车研究所 | Method and device for inhibiting transformer no-load switchon surge |
| CN101702360A (en) * | 2009-11-10 | 2010-05-05 | 中国船舶重工集团公司第七一二研究所 | Pre-magnetizing device of power supply transformer and pre-magnetizing method thereof |
| US20140035530A1 (en) * | 2011-04-18 | 2014-02-06 | Zehua Shao | Electric automobile pwm rectification and converting voltage/current pulse charging system |
| CN102779612A (en) * | 2012-08-07 | 2012-11-14 | 泰州海田电气制造有限公司 | Pre-magnetizing device for main power supply transformer of electric power circuit |
| CN203278635U (en) * | 2013-05-14 | 2013-11-06 | 中国船舶重工集团公司第七一二研究所 | Precharging device having pre-magnetizing function |
| CN104034982A (en) * | 2014-06-19 | 2014-09-10 | 国家电网公司 | Electric energy quality harmonic disturbance source platform |
| CN106058939A (en) * | 2016-08-05 | 2016-10-26 | 北京千驷驭电气有限公司 | Closing control system and inrush current free control method of transformer |
| CN205900232U (en) * | 2016-08-09 | 2017-01-18 | 上海振华重工(集团)股份有限公司 | Bank bridge main transformer's magnetization device in advance |
| CN109448952A (en) * | 2018-12-19 | 2019-03-08 | 卧龙电气南阳防爆集团股份有限公司 | A kind of low pressure pre-magnetizing system and method for high-power fairing |
| CN115224665A (en) * | 2022-07-20 | 2022-10-21 | 安徽合凯电气科技股份有限公司 | Pre-charging magnetic type transformer inrush current suppression device |
| CN115719941A (en) * | 2022-12-02 | 2023-02-28 | 湖北亿纬动力有限公司 | Excitation inrush current suppression device and method and ship energy storage system |
Non-Patent Citations (1)
| Title |
|---|
| 王义凯等: "串接小容量变压器预充磁技术参数设计", 《电力自动化设备》, vol. 42, no. 9, 30 September 2022 (2022-09-30), pages 197 - 202 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117117794B (en) | 2024-02-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9947496B2 (en) | Circuit breaker with hybrid switch | |
| EP2858195B1 (en) | Converter circuit | |
| US20020070821A1 (en) | RFI filter for a frequency converter | |
| WO2010055568A1 (en) | Magnetic energy regeneration switch provided with protection circuit | |
| EP3016124A1 (en) | Control circuit of diode contact protection combination switch and relay control method | |
| CN103703663A (en) | A resonant-mode power supply with a multi-winding inductor | |
| WO2014038008A1 (en) | Dc breaker | |
| EP3878070B1 (en) | Ac/dc converter arrangement | |
| GB2520529A (en) | Circuit breaker with hybrid switch | |
| CN117117794B (en) | Transformer pre-magnetizing circuit and control method thereof | |
| CN106451500B (en) | Interphase load transfer terminal device based on transient waveform fitting | |
| CN100362720C (en) | Active superconducting direct current limiter | |
| CN208299708U (en) | Threephase asynchronous machine starting device | |
| CN101610063A (en) | A kind of high voltage converter and control method thereof of utilizing inverter carrying out soft excitation | |
| KR20180099431A (en) | Double quench current limiting device for direct current and alternating current | |
| CN211628989U (en) | High-power intermediate relay of AC/DC load | |
| CN108111028A (en) | A kind of converter plant of electric railway ground flexible auto-passing neutral section system | |
| WO2020004578A1 (en) | Railway car drive system and railway car drive method | |
| CN102881517A (en) | Auxiliary contact device with two-station protection | |
| Ruszczyk et al. | Solid-state switch for capacitors bank used in reactive power compensation | |
| RU124070U1 (en) | DEVICE FOR LONGITUDINAL CAPACITY COMPENSATION OF AC TRACING SUBSTATION | |
| CN110912083A (en) | Direct current source based on magnetic coupling enhancement characteristic current limiter and control method thereof | |
| CN204794015U (en) | Electric leakage circuit breaker | |
| CN111092435A (en) | Adjustable intelligent capacitor | |
| CN212086078U (en) | Intelligent power circuit and power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |