CN111863404A - Design method of special multi-voltage combined transformer - Google Patents
Design method of special multi-voltage combined transformer Download PDFInfo
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- CN111863404A CN111863404A CN202010907847.3A CN202010907847A CN111863404A CN 111863404 A CN111863404 A CN 111863404A CN 202010907847 A CN202010907847 A CN 202010907847A CN 111863404 A CN111863404 A CN 111863404A
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- combination
- load loss
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
The invention relates to an improvement of a power transformer technology, in particular to a special multi-voltage combined transformer design method, which comprises the following steps: step one, selecting main technical indexes of a user aiming at a multi-voltage combined transformer; the method specifically comprises the following steps: 1. a rated capacity; 2. combining three voltages; 3. each combined capacity; 4. each combination connection group; 5. an impedance voltage; 6. load loss of each voltage combination; 7. no-load loss; determining the combination type, each combination connection method and each combination capacity of the multi-voltage combined transformer; step three, determining the load loss and no-load loss of each combination; according to the relevant working principle, structure and process characteristics of the transformer, technical indexes such as impedance voltage, load loss, no-load loss and the like of the special multi-voltage combined transformer can be analyzed and calculated in detail through example research.
Description
Technical Field
The invention relates to an improvement of a power transformer technology, in particular to a special multi-voltage combined transformer design method.
Background
Generally, a power transformer only has one voltage combination, for example, 6kV is reduced to 0.4kV, or 10kV is reduced to 0.4kV, each phase winding of the single-voltage combined transformer has only two coils, one high voltage and one low voltage, and for the conventional single-voltage combined transformer, both a theoretical system, a structure and a process are relatively mature, a uniform design principle can be followed, and more materials can be used for reference; for the design of a multi-voltage combined transformer, due to the particularity and the irregularity of the requirements, the current special transformer has no national standard and no unified design principle, the number of voltage combinations and the index requirements of all parameters are determined by users according to the actual use conditions of the users, in terms of design, due to the lack of the design principle, the reference is provided rarely, the design relates to a large number of aspects, on one hand, the design difficulty is increased, and on the other hand, the product possibly designed by carelessness does not meet the index requirements.
In the design process, because the number of voltage combinations is large, the number of coils of each phase winding is large, and a series of problems such as series connection and parallel connection among the coils, connection groups among different phases and the like are involved among the same phases, the design difficulty is increased, and the structure and the manufacturing process are complex.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the existing defects and provide a special design method of a multi-voltage combined transformer.
In order to solve the technical problems, the invention provides the following technical scheme: a design method of a special multi-voltage combined transformer comprises the following steps:
step one, selecting main technical indexes of a user aiming at a multi-voltage combined transformer; the method specifically comprises the following steps: 1. a rated capacity; 2. combining three voltages; 3. each combined capacity; 4. each combination connection group; 5. an impedance voltage; 6. load loss of each voltage combination; 7. no-load loss;
determining the combination type, each combination connection method and each combination capacity of the multi-voltage combined transformer;
and step three, determining the load loss and the no-load loss of each combination.
Preferably, the method further comprises the following step four: it is determined whether the three high voltage coils on each phase winding of the multi-voltage combination transformer need to be completely independent or separated from each other or several coils need to be connected through a series-parallel changeover switch.
Preferably, the impedance voltage error in the first step is evaluated as ± 10%.
Preferably, the load loss of each voltage combination in the first step is evaluated according to +/-10%.
Preferably, the idle losses in the first step are evaluated as ± 10%.
The invention has the beneficial effects that: according to the special multi-voltage combined transformer design method, the technical indexes such as impedance voltage, load loss, no-load loss and the like of the special multi-voltage combined transformer can be analyzed and calculated in detail through example research according to the relevant working principle, structure and process characteristics of the transformer; the method can be used for designing the multi-voltage combined transformer of the same type or similar types for scientific and technical personnel, has reference value, can provide design experience and technical guarantee for the designer to design the multi-voltage combined transformer, and can create good economic and social benefits for related transformer production enterprises.
Drawings
Fig. 1 is a schematic diagram of the arrangement position and size of coils of each voltage class according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
A design method of a special multi-voltage combined transformer comprises the following steps:
step one, selecting main technical indexes of a user aiming at a multi-voltage combined transformer; the method specifically comprises the following steps: 1. a rated capacity; 2. combining three voltages; 3. each combined capacity; 4. each combination connection group; 5. an impedance voltage; 6. load loss of each voltage combination; 7. no-load loss;
determining the combination type, each combination connection method and each combination capacity of the multi-voltage combined transformer;
and step three, determining the load loss and the no-load loss of each combination.
The method also comprises the following four steps: it is determined whether the three high voltage coils on each phase winding of the multi-voltage combination transformer need to be completely independent or separated from each other or several coils need to be connected through a series-parallel changeover switch.
And in the first step, the impedance voltage error is checked according to +/-10%.
And evaluating the load loss of each voltage combination in the first step according to +/-10%.
And (3) checking the no-load losses in the step one according to +/-10%.
In specific implementation, taking a certain multi-voltage combined transformer SSY-1000/10-3 as an example, the main technical indexes of a user are as follows:
rated capacity: 1000 (kVA);
three voltages are combined: 10-6-3/0.4 (kV);
each combined capacity: 1000 (kVA);
each combination and connection group is as follows: yy 0;
impedance voltage: 1) 3/0.4(kV) for voltage combinations; UK ═ 4.5%.
2) 6/0.4(kV) for the voltage combination; UK ═ 4.5%.
3) 10/0.4(kV) for the voltage combination; UK ═ 6%.
(requirement impedance error is evaluated as. + -. 10%)
(6) The combined load loss of each voltage is: 11600 (W); (requirement load error assessment of. + -. 10%)
(7) No-load loss: 2000 (W); (requirement no-load error assessment of + -10%)
From the above main technical indexes, the transformer has three voltage combinations, namely 3kV voltage reduction of 0.4kV, 6kV voltage reduction of 0.4kV and 10kV voltage reduction of 0.4kV, the connection method of each combination is the same and is Yy0 connection, and the capacity of each combination is also the same and is 1000 kVA; the load and no-load losses of each combination are also the same, except that the impedance of the combination (6%) is higher for a 10kV step down to 0.4kV than for the other two combinations (6%).
In the case of the present embodiment, since the three high voltage voltages have a certain correlation in value, the three high voltage coils on each phase of winding are not completely independent and separated from each other, but several coils can be connected by series-parallel switches to generate different high voltage, so that one coil can be used in different high voltage by series-parallel connection, thereby saving material and reducing space.
Since the high-voltage coils are not completely independent and are separated from each other, the method brings about how to connect the coils serving as the high-voltage coils in series and in parallel, and in addition, how to arrange the coils, all of which directly influence the calculation of the impedance voltage, the load loss and the no-load loss of the combination of the three voltages.
In the example, each phase of winding has four coils, one 0.4kV low-voltage coil is arranged at the innermost layer, two 3kV coils are arranged up and down and arranged at the middle layer, one 4kV coil is arranged at the outermost layer, and the specific arrangement position and size are shown in figure 1.
By string-associative switches, the following three voltage combinations can be generated. (1) Connecting two 3kV coils in parallel, and combining the two coils with a 0.4kV low-voltage coil to form a 3/0.4kV voltage combination; (2) connecting two 3kV coils in series, and then combining the two coils with a 0.4kV low-voltage coil to form a 6/0.4kV voltage combination; (3) two 3kV coils and one 4kV coil are connected in series and then combined with a 0.4kV low-voltage coil to form a 10/0.4kV voltage combination.
The above embodiments are preferred embodiments of the present invention, and those skilled in the art can make variations and modifications to the above embodiments, therefore, the present invention is not limited to the above embodiments, and any obvious improvements, substitutions or modifications made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (5)
1. A special multi-voltage combined transformer design method is characterized in that: the method comprises the following steps:
step one, selecting main technical indexes of a user aiming at a multi-voltage combined transformer; the method specifically comprises the following steps: 1. a rated capacity; 2. combining three voltages; 3. each combined capacity; 4. each combination connection group; 5. an impedance voltage; 6. load loss of each voltage combination; 7. no-load loss;
determining the combination type, each combination connection method and each combination capacity of the multi-voltage combined transformer;
and step three, determining the load loss and the no-load loss of each combination.
2. The special multi-voltage combination transformer design method of claim 1, characterized in that: the method also comprises the following four steps: it is determined whether the three high voltage coils on each phase winding of the multi-voltage combination transformer need to be completely independent or separated from each other or several coils need to be connected through a series-parallel changeover switch.
3. The special multi-voltage combination transformer design method of claim 1, characterized in that: and in the first step, the impedance voltage error is checked according to +/-10%.
4. The special multi-voltage combination transformer design method of claim 1, characterized in that: and evaluating the load loss of each voltage combination in the first step according to +/-10%.
5. The special multi-voltage combination transformer design method of claim 1, characterized in that: and (3) checking the no-load losses in the step one according to +/-10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010907847.3A CN111863404A (en) | 2020-09-02 | 2020-09-02 | Design method of special multi-voltage combined transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010907847.3A CN111863404A (en) | 2020-09-02 | 2020-09-02 | Design method of special multi-voltage combined transformer |
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| Publication Number | Publication Date |
|---|---|
| CN111863404A true CN111863404A (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010907847.3A Withdrawn CN111863404A (en) | 2020-09-02 | 2020-09-02 | Design method of special multi-voltage combined transformer |
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|---|---|
| CN (1) | CN111863404A (en) |
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2020
- 2020-09-02 CN CN202010907847.3A patent/CN111863404A/en not_active Withdrawn
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Application publication date: 20201030 |