CN117423529B - Autotransformer with step-down starting function - Google Patents
Autotransformer with step-down starting function Download PDFInfo
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- CN117423529B CN117423529B CN202311750704.6A CN202311750704A CN117423529B CN 117423529 B CN117423529 B CN 117423529B CN 202311750704 A CN202311750704 A CN 202311750704A CN 117423529 B CN117423529 B CN 117423529B
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- 238000012360 testing method Methods 0.000 claims abstract description 20
- 230000001681 protective effect Effects 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 23
- 230000009466 transformation Effects 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000009863 impact test Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000010998 test method Methods 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/266—Fastening or mounting the core on casing or support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention discloses an autotransformer with a step-down starting function, which relates to the related fields of transformers and testing devices, and comprises an autotransformer; the autotransformer is fixedly arranged at the inner bottom of the protective cabinet body through bolts; the top bus of the autotransformer is connected with the switch assembly in a line, the load test is carried out on the autotransformer device, the flow is simple, the measurement wiring is simple, the test method has the characteristics of high efficiency and accuracy, the related data such as voltage, current and angle can be accurately calculated, and the judgment is realized in a wiring mode; the testing method can display and analyze data, improve the on-load testing efficiency, reduce intermediate links, timely arrange data and generate an electronic version report.
Description
Technical Field
The invention relates to the related fields of transformers and testing devices, in particular to an autotransformer with a step-down starting function.
Background
The autotransformer is a transformer with primary and secondary windings on the same winding, the primary and secondary windings are directly connected in series and self-coupled; the structure can be divided into adjustable pressure type and fixed type; the self-coupling is electromagnetic coupling, the common transformer transmits energy through the electromagnetic coupling of the primary side coil and the secondary side coil, the primary side coil and the secondary side coil of the self-coupling transformer have no direct electrical connection, and the primary side coil and the secondary side coil of the self-coupling transformer have direct electrical connection, and the low-voltage coil is a part of the high-voltage coil.
The load detection method in the prior art is mostly complicated in flow, the wiring of the measuring piece is complex, related personnel are required to have higher theoretical basis and professional skill level, talent cost is high, related data are difficult to detect rapidly, and subsequent data analysis procedures are difficult to develop.
Disclosure of Invention
Therefore, in order to solve the above-mentioned shortcomings, the present invention provides an autotransformer with a step-down starting function.
The invention is realized by constructing an autotransformer with a step-down starting function, the device comprising the autotransformer; the autotransformer is fixedly arranged at the inner bottom of the protective cabinet body through bolts; the self-coupling transformer top bus is connected with the switch assembly line; the autotransformer is connected with the power transformer in series and parallel in a mixed mode through a cable; a measuring assembly for measuring the autotransformer circuit is arranged in the protective cabinet body; the autotransformer bus is connected with an output contact arranged on the front side of the protective cabinet body through a cable, and the output contact is connected with an external motor unit cable; the rear side of the measuring assembly is connected with an external control terminal through an external connection cable;
the autotransformer comprises an insulating pad foot fixedly arranged at the inner bottom of the protective cabinet body; the top of the insulating pad foot is provided with a clamping frame for supporting through a bolt; an insulating cushion block is fixedly arranged at the top of the clamping frame; the insulating cushion block is fixedly provided with a thin inclined cushion block for supporting; the thin inclined cushion block is fixedly arranged at the through groove of the insulating cushion; an iron core is fixedly arranged at the top of the insulating cushion block; the three groups of vertical rods on the middle side of the iron core are wound with low-voltage coils; and a high-voltage coil is arranged outside the low-voltage coil.
Preferably, the autotransformer, the switching assembly, the power transformer, the measurement assembly, and the output contact are wired and form a starting loop W.
Preferably, the measuring assembly is specifically composed of instrument instruments which are arranged on the starting loop W in series and parallel and are used for detecting factors of the autotransformer and the power transformer.
A testing method of an autotransformer with a step-down starting function is characterized by comprising the following steps of: the method comprises the following steps:
s1, firstly, setting rated capacity according to power transformer equipmentRated voltage value V1, rated minimum short-circuit capacity of high-voltage side of power transformer +.>And rated voltage value on the low-voltage side +.>AutotransformerRated voltage +.>The overall input capacity of the starting loop W>The related numerical value is preset and input to an external control terminal connected with an external cable;
s2, connecting the cable between the output contact and an external unit, and performing a short circuit impact test;
s2.1, detecting the working voltage value V2 of the power transformer at the moment, and obtaining the transformation ratio value of the power transformer by a V2/V1 formula；
S2.2, detecting the short circuit of the secondary side of the power transformer through a detection part in a short circuit test, and applying voltage to the primary side until the voltage V4 when the rated current flows in the coil, thereby obtaining the short circuit voltage percentage of the power transformer through V4/V1；
S2.3, the same applies, auto-transformer transformation ratio valueThe voltage of one short circuit side of the autotransformer is calculated by V6/V7, wherein V6 is the voltage of one short circuit side of the autotransformer when the rated current is connected in the working process, and V7 is the rated voltage of the autotransformer;
s3, controlling the normally open contact III to be opened, and enabling the normally open contact I and the normally open contact II to be closed, wherein the autotransformer realizes voltage reduction and starts an external motor;
s4, calculating the voltage reduction starting values of the autotransformer;
s4.1, minimum three-phase short-circuit capacity of low-voltage end of power transformer；
；
Wherein the rated capacity of the power transformer deviceThe method comprises the steps of carrying out a first treatment on the surface of the Rated minimum short-circuit capacity of high-voltage side of power transformer>The method comprises the steps of carrying out a first treatment on the surface of the Short-circuit voltage percentage of power transformer>The method comprises the steps of carrying out a first treatment on the surface of the Transformation ratio of power transformer->；
S4.2, voltage relative value;
s4.2.1 relative value of bus voltage of autotransformer；
；
Wherein, the whole input capacity of the starting loop WThe method comprises the steps of carrying out a first treatment on the surface of the Bus pre-connected reactive load->；
S4.2.2 and output contact terminal voltage relative value；
；
Wherein,is an autotransformerA transformation ratio value; />The rated voltage value is the rated voltage value of the low-voltage side of the power transformer; z is the rated voltage of the external motor group connected in series with the output contact; c is the rated starting capacity of the external motor group connected in series with the output contact;
s5, generating a step-down start test numerical report.
The invention has the following advantages: the invention provides an autotransformer with a step-down starting function through improvement, and compared with the same type of equipment, the autotransformer with the step-down starting function has the following improvement:
the autotransformer with the step-down starting function has the characteristics of high efficiency and accuracy, can accurately calculate relevant data such as voltage, current, angle and the like, and can judge a line connection mode, and the load test is carried out on the autotransformer device; the testing method can display and analyze data, improve the on-load testing efficiency, reduce intermediate links, timely arrange data and generate an electronic version report.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the axial side structure of the autotransformer and the protective cabinet of the present invention;
FIG. 3 is a schematic diagram of an exploded construction of the autotransformer of the present invention;
FIG. 4 is a partial wiring diagram of the startup loop W of the present invention;
fig. 5 is a flow chart of the present invention.
Wherein: the transformer comprises an autotransformer-1, a protective cabinet body-2, a switch assembly-3, a power transformer-4, a measuring assembly-5, an output contact-6, an external cable-7, an insulating pad foot-11, a clamping frame-12, an insulating pad block-13, a thin inclined pad block-14, an insulating pad-15, an iron core-16, a low-voltage coil-17 and a high-voltage coil-18.
Detailed Description
The principles and features of the present invention are described below with reference to fig. 1-5, the examples being provided for illustration only and not for limitation of the scope of the invention. The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "configured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Hereinafter, an embodiment of the present invention will be described in accordance with its entire structure.
Referring to fig. 1 to 5, an autotransformer with a step-down start function of the present invention includes an autotransformer 1; the autotransformer 1 is fixedly arranged at the inner bottom of the protective cabinet body 2 through bolts; the bus on the top side of the autotransformer 1 is connected with a switch assembly 3 in a line manner; the autotransformer 1 is connected with the power transformer 4 in series and parallel in a mixed mode through a cable; a measuring component 5 for measuring the circuit of the autotransformer 1 is arranged in the protective cabinet body 2; the bus of the autotransformer 1 is connected with an output contact 6 arranged on the front side of the protective cabinet body 2 through a cable, and the output contact 6 is connected with an external motor group cable; the rear side of the measuring assembly 5 is connected to an external control terminal by means of an external connection cable 7.
The autotransformer 1 comprises an insulating pad 11 fixedly arranged at the inner bottom of the protective cabinet body 2; the top of the insulating pad leg 11 is provided with a clamping frame 12 for supporting through bolts; an insulating cushion block 13 is fixedly arranged at the top of the clamping frame 12; the insulating cushion block 13 is fixedly provided with a thin inclined cushion block 14 for supporting; the thin inclined cushion block 14 is fixedly arranged at the through groove of the insulating pad 15; an iron core 16 is fixedly arranged at the top of the insulating cushion block 13; the three groups of vertical rods on the middle side of the iron core 16 are wound with low-voltage coils 17; the low-voltage coil 17 is provided with a high-voltage coil 18 on the outside.
The autotransformer 1, the switching assembly 3, the power transformer 4, and the measurement assembly 5, and the output contacts 6 are wired and form a starting loop W.
The measuring assembly 5 is specifically composed of instrument instruments which are arranged in series and parallel on the starting loop W and are used for detecting each factor of the autotransformer 1 and the power transformer 4.
The working principle of the autotransformer with the step-down starting function is as follows:
step one, presetting a numerical value; first according to rated capacity set by power transformer 4 equipmentRated voltage value V1, rated minimum short-circuit capacity of high-voltage side of power transformer 4 +.>And rated voltage value on the low-voltage side +.>Rated voltage +.>The overall input capacity of the starting loop W>The relevant numerical value is preset and input to an external control terminal connected with the external cable 7;
step (a)2. Short circuit impact test; firstly, connecting a cable between an output contact 6 and an external unit, and performing a short-circuit impact test; at this time, the working voltage value V2 of the power transformer 4 is detected, and the variable value of the power transformer 4 is obtained by the formula V2/V1The method comprises the steps of carrying out a first treatment on the surface of the In the short circuit test, the detection part detects the short circuit of the secondary side of the power transformer 4, the primary side is applied with voltage until the voltage V4 when the rated current flows in the coil, and the short circuit voltage percentage of the power transformer 4 is obtained by V4/V1>The method comprises the steps of carrying out a first treatment on the surface of the Similarly, the autotransformer 1 becomes a ratio value +.>The voltage of the short circuit side of the autotransformer 1 is calculated by V6/V7, wherein V6 is the voltage of the short circuit side of the autotransformer 1 when the rated current is connected in the working process, and V7 is the rated voltage of the autotransformer 1;
step three, reducing the pressure and starting the test; when the normally open contact III is controlled to be opened and the normally open contact I and the normally open contact II are closed, the autotransformer 1 realizes voltage reduction to start an external motor;
step four, calculating the value of each load started by the step down of the autotransformer 1; firstly, calculating the minimum three-phase short-circuit capacity of the low-voltage end of the power transformer 4The method is characterized by comprising the following steps:
；
wherein the rated capacity of the power transformer deviceThe method comprises the steps of carrying out a first treatment on the surface of the Rated minimum short-circuit capacity of high-voltage side of power transformer>The method comprises the steps of carrying out a first treatment on the surface of the Short-circuit voltage of power transformerPercentage%>The method comprises the steps of carrying out a first treatment on the surface of the Transformation ratio of power transformer->；
The relative values of the terminal voltages of the autotransformer 1 and the output contact 6 are then calculated as follows: bus voltage relative value of autotransformer 1：
；
Wherein, the whole input capacity of the starting loop WThe method comprises the steps of carrying out a first treatment on the surface of the Bus pre-connected reactive load->；
Re-calculating the relative value of the terminal voltage of the output contact 6The method is characterized by comprising the following steps:
；
wherein,is the value of the transformation ratio of the autotransformer; />The rated voltage value is the rated voltage value of the low-voltage side of the power transformer; z is the rated voltage of the external motor group connected in series with the output contact; c is the rated starting capacity of the external motor group connected in series with the output contact;
and step five, generating a step-down start test numerical report.
The invention provides the autotransformer with the step-down starting function through improvement, the load test is carried out on the autotransformer 1 device, the flow is simple, the measurement wiring is simple, the test method has the characteristics of high efficiency and accuracy, the related data such as voltage, current, angle and the like can be accurately calculated, and the judgment is realized on the wiring mode; the testing method can display and analyze data, improve the on-load testing efficiency, reduce intermediate links, timely arrange data and generate an electronic version report.
The basic principle and main characteristics of the invention and the advantages of the invention are shown and described above, standard parts used by the invention can be purchased from market, special-shaped parts can be customized according to the description of the specification and the drawings, the specific connection modes of the parts adopt conventional means such as mature bolt rivets and welding in the prior art, the machinery, the parts and the equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection modes in the prior art, so that the description is omitted.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. An autotransformer with a step-down starting function comprises an autotransformer (1); the autotransformer (1) is fixedly arranged at the inner bottom of the protective cabinet body (2) through bolts; the top bus of the autotransformer (1) is connected with the switch assembly (3) in a line way; the autotransformer (1) is connected with the power transformer (4) in series and parallel in a mixed mode through a cable; a measuring assembly (5) for measuring the circuit of the autotransformer (1) is arranged in the protective cabinet body (2); the bus of the autotransformer (1) is connected with an output contact (6) arranged on the front side of the protective cabinet body (2) through a cable, and the output contact (6) is connected with an external motor unit cable; the rear side of the measuring assembly (5) is connected with an external control terminal through an external connection cable (7);
the method is characterized in that: the autotransformer (1) comprises an insulating pad foot (11) fixedly arranged at the inner bottom of the protective cabinet body (2); a clamping frame (12) for supporting is arranged at the top of the insulating pad foot (11) through a bolt; an insulating cushion block (13) is fixedly arranged at the top of the clamping frame (12); the insulating cushion block (13) is fixedly provided with a thin inclined cushion block (14) for supporting; the thin inclined cushion block (14) is fixedly arranged at the through groove of the insulating pad (15); an iron core (16) is fixedly arranged at the top of the insulating cushion block (13); the three groups of vertical rods on the middle side of the iron core (16) are wound with low-voltage coils (17); a high-voltage coil (18) is arranged outside the low-voltage coil (17);
the measuring assembly (5) is specifically composed of instrument instruments which are arranged on the starting loop W in series and parallel and are used for detecting factors of the autotransformer (1) and the power transformer (4);
in the above-mentioned autotransformer with step-down starting function, the method for testing the autotransformer with step-down starting function further comprises the following steps:
s1, firstly, setting rated capacity according to equipment of a power transformer (4)Rated voltage value V1, rated minimum short-circuit capacity of high-voltage side of power transformer (4)>And rated voltage value on the low-voltage side +.>Rated voltage +.>The overall input capacity of the starting loop W>The related numerical value is preset and input to an external control terminal connected with an external cable (7);
s2, connecting a cable between the output contact (6) and an external unit, and performing a short circuit impact test;
s2.1, detecting the working voltage value V2 of the power transformer (4) at the moment, and obtaining the transformation ratio value of the power transformer (4) by a V2/V1 formula；
S2.2, detecting the short circuit of the secondary side of the power transformer (4) through a detection part in a short circuit test, and applying voltage to the primary side until the voltage V4 when the rated current flows in the coil, thereby obtaining the short circuit voltage percentage of the power transformer (4) through V4/V1；
S2.3, the same applies, auto-transformer (1) becomes the ratio valueV6/V7 is calculated, wherein V6 is the voltage of one short circuit side of the autotransformer (1) when the rated current is connected in the working process, and V7 is the rated voltage of the autotransformer (1);
s3, controlling the normally open contact III to be opened, and enabling the normally open contact I and the normally open contact II to be closed, wherein the autotransformer (1) realizes voltage reduction and starts an external motor;
s4, calculating the voltage reduction starting of the autotransformer (1) to start each load value;
s4.1, minimum three-phase short-circuit capacity of low-voltage end of power transformer (4)；
；
Wherein the rated capacity of the power transformer (4) deviceThe method comprises the steps of carrying out a first treatment on the surface of the Rated minimum short-circuit capacity of high-voltage side of power transformer (4)The method comprises the steps of carrying out a first treatment on the surface of the Short-circuit voltage percentage of power transformer (4)>The method comprises the steps of carrying out a first treatment on the surface of the The transformation ratio of the power transformer (4)>；
S4.2, voltage relative value;
s4.2.1 relative values of bus voltage of autotransformer (1)；
；
Wherein, the whole input capacity of the starting loop WThe method comprises the steps of carrying out a first treatment on the surface of the Bus pre-connected reactive load->；
S4.2.2 relative value of terminal voltage of output contact (6)；
；
Wherein,is a transformation ratio value of the autotransformer (1); />Is the rated voltage value of the low-voltage side of the power transformer (4); z is the rated voltage of the external motor group connected in series with the output contact (6); c is the rated starting capacity of the external motor group connected in series with the output contact (6);
s5, generating a step-down start test numerical report.
2. An autotransformer with a step-down start function as claimed in claim 1, wherein: the autotransformer (1), the switch assembly (3), the power transformer (4), the measuring assembly (5) and the output contact (6) are connected in a line and form a starting loop W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311750704.6A CN117423529B (en) | 2023-12-19 | 2023-12-19 | Autotransformer with step-down starting function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311750704.6A CN117423529B (en) | 2023-12-19 | 2023-12-19 | Autotransformer with step-down starting function |
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| CN117423529A CN117423529A (en) | 2024-01-19 |
| CN117423529B true CN117423529B (en) | 2024-03-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312235A (en) * | 2013-06-08 | 2013-09-18 | 田安振 | Composite self-coupling buck energy-saving soft starter |
| CN203232791U (en) * | 2013-05-03 | 2013-10-09 | 陕西磐隆电器工业设备集团有限公司 | Autotransformer for reduced-voltage starting |
| CN204242795U (en) * | 2014-11-24 | 2015-04-01 | 杭州钱江电气集团股份有限公司 | The neutral point measurement mechanism of autotransformer |
| CN205725531U (en) * | 2016-05-05 | 2016-11-23 | 南安市品龙新材料科技有限公司 | A kind of auto-coupling voltage-reduction starting switch board |
| CN113253155A (en) * | 2020-12-31 | 2021-08-13 | 国网河南省电力公司检修公司 | Load testing device and method for autotransformer |
| CN215682146U (en) * | 2021-08-30 | 2022-01-28 | 盐城联旺机械有限公司 | Three-dimensional step-down multi-pulse auto-transformer rectification |
-
2023
- 2023-12-19 CN CN202311750704.6A patent/CN117423529B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203232791U (en) * | 2013-05-03 | 2013-10-09 | 陕西磐隆电器工业设备集团有限公司 | Autotransformer for reduced-voltage starting |
| CN103312235A (en) * | 2013-06-08 | 2013-09-18 | 田安振 | Composite self-coupling buck energy-saving soft starter |
| CN204242795U (en) * | 2014-11-24 | 2015-04-01 | 杭州钱江电气集团股份有限公司 | The neutral point measurement mechanism of autotransformer |
| CN205725531U (en) * | 2016-05-05 | 2016-11-23 | 南安市品龙新材料科技有限公司 | A kind of auto-coupling voltage-reduction starting switch board |
| CN113253155A (en) * | 2020-12-31 | 2021-08-13 | 国网河南省电力公司检修公司 | Load testing device and method for autotransformer |
| CN215682146U (en) * | 2021-08-30 | 2022-01-28 | 盐城联旺机械有限公司 | Three-dimensional step-down multi-pulse auto-transformer rectification |
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| CN117423529A (en) | 2024-01-19 |
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