Novel structure of star-delta conversion double-voltage transformer
By adjusting the number of turns in the high-voltage coil and changing the tap, combined with optimization of the high-voltage leads, the problem of existing transformers requiring two voltage levels was solved, realizing dual-voltage conversion of a single transformer and reducing cost and complexity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-14
- Publication Date
- 2026-03-31
AI Technical Summary
Existing transformers require two voltage levels, leading to increased equipment investment and high operating costs. Furthermore, existing star-delta switching devices are complex in structure, expensive, and have large voltage ratio deviations.
By replacing the high-value star-delta changeover switch with a regular tap changer, and by adjusting the number of turns of the high-voltage coil and changing the tap, combined with the optimization of the high-voltage leads, the conversion between 10kV and 6kV voltage levels of a single transformer can be achieved.
It achieves high voltage ratio accuracy (deviation within 0.25%), reduces equipment costs, avoids the need to purchase multiple transformers, and is easy to operate.
Smart Images
Figure CN224067529U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electrical equipment technical field, concretely is a star angle conversion dual voltage transformer new structure. BACKGROUND
[0002] The power grid of most areas of town and country has adopted 10kV power grid voltage power supply, but some coal mines, petroleum chemical industry enterprises still retain 6kV power supply grid, which brings inconvenience to transformer use for construction enterprises, and the construction enterprises need to have two different voltage grade transformers, one is 6kV transformer, and the other is 10kV transformer, which inevitably causes one transformer to be used and the other to be idle, and adds one time transformer investment to the enterprise, and also increases installation, removal, reinstallation and other costs.
[0003] At present, the ordinary distribution transformer can only convert one grade voltage and current into another grade voltage and current of the same frequency, and the single connection group, or the high-priced star angle conversion switch can realize star angle conversion dual voltage ratio conversion and output, but the structure is complex, the conversion voltage ratio deviation is large (about 4% of the ratio deviation), and the cost is high, and the customer selection and technical consideration are not ideal.
[0004] Based on this, a star angle conversion dual voltage transformer new structure is provided, which can eliminate the disadvantages of the existing device. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a star angle conversion dual voltage transformer new structure to solve the problems in the background art.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:
[0007] A star angle conversion dual voltage transformer new structure, comprising a transformer body, a switching switch and a tap voltage regulating switch, the transformer body comprises a high voltage coil A, a high voltage coil B and a high voltage coil C, and the high voltage coil A, the high voltage coil B and the high voltage coil C have the same three-phase winding direction structure.
[0008] On the basis of the above technical scheme, the utility model also provides the following optional technical scheme:
[0009] In an alternative: the high-voltage coil A is provided with tap one X6, tap two X4, tap three X2, tap four X3, tap five X5, tap six X7, tap seven X9, the high-voltage coil B is provided with tap one Y6, tap two Y4, tap three Y2, tap four Y3, tap five Y5, tap six Y7, tap seven Y9, the high-voltage coil C is provided with tap one Z6, tap two Z4, tap three Z2, tap four Z3, tap five Z5, tap six Z7, tap seven Z9.
[0010] In an alternative: the switching switch is provided with tap one X2, tap two X3, tap three X4, tap four X5, tap five Y2, tap six Y3, tap seven Y4, tap eight Y5, tap nine Z2, tap ten Z3, tap eleven Z4, tap twelve Z5, the tap voltage regulating switch is provided with three taps one D2, three taps two D3, three taps three D4, three taps four D5, three taps five D6, three taps six D7.
[0011] In an alternative: the coil first tap of the high-voltage coil A is connected to tap twelve Z5 of the switching switch, the coil first tap of the high-voltage coil B is connected to tap four X5 of the switching switch, the coil first tap of the high-voltage coil C is connected to tap eight Y5 of the switching switch, the tap seven X9 of the high-voltage coil A is connected to tap three X4 of the switching switch, the tap seven Y9 of the high-voltage coil B is connected to tap seven Y4 of the switching switch, the tap seven Z9 of the high-voltage coil C is connected to tap eleven Z4 of the switching switch.
[0012] In an alternative: the tap six X7 of the high-voltage coil A is connected to tap one X2 of the switching switch, the tap six Y7 of the high-voltage coil B is connected to tap five Y2 of the switching switch, the tap six Z7 of the high-voltage coil C is connected to tap nine Z2 of the switching switch.
[0013] In an alternative: the tap six X7 of the high-voltage coil A, the tap six Y7 of the high-voltage coil B and the tap six Z7 of the high-voltage coil C are respectively connected to three taps six D7 in the tap voltage regulating switch.
[0014] In an alternative, the tap X6 of the high-voltage coil A, the tap Y6 of the high-voltage coil B and the tap Z6 of the high-voltage coil C are connected to the three terminals five D6 of the tap voltage regulating switch respectively, the tap X4 of the high-voltage coil A, the tap Y4 of the high-voltage coil B and the tap Z4 of the high-voltage coil C are connected to the three terminals three D4 of the tap voltage regulating switch respectively, the tap X2 of the high-voltage coil A, the tap Y2 of the high-voltage coil B and the tap Z2 of the high-voltage coil C are connected to the three terminals one D2 of the tap voltage regulating switch respectively, the tap X3 of the high-voltage coil A, the tap Y3 of the high-voltage coil B and the tap Z3 of the high-voltage coil C are connected to the three terminals two D3 of the tap voltage regulating switch respectively, and the tap X5 of the high-voltage coil A, the tap X5 of the high-voltage coil B and the tap X5 of the high-voltage coil C are connected to the three terminals four D5 of the tap voltage regulating switch respectively.
[0015] In an alternative, the terminal two X3, the terminal six Y3 and the terminal ten Z3 of the switch-over switch are short-circuited.
[0016] In an alternative, the switch-over switch is a common three-tap no-load switch.
[0017] Compared with the prior art, the utility model has the advantages of the following:
[0018] The utility model discloses a common tap switch is used to replace the high star-delta conversion switch, and the conversion of the 10kV (Y) and 6kV (D) voltage levels of the primary side of single transformer is realized only by the adjustment of the high-voltage coil turns, the change of the tap and the optimization of the high-voltage lead, and the voltage ratio is accurate, and the deviation is within 0.25%, so the new transformer needs not to be purchased due to the conversion of the voltage level. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is the structural schematic diagram of the utility model.
[0020] Figure 2 It is the high-voltage coil tap schematic diagram of the utility model.
[0021] Figure 3 It is the high-voltage lead wiring schematic diagram of the utility model.
[0022] Figure 4 It is the switch-over switch terminal schematic diagram of the utility model.
[0023] Figure 5 It is the tap voltage regulating switch terminal schematic diagram of the utility model.
[0024] Mark annotation: 100, transformer body, 101, switch-over switch, 102, tap voltage regulating switch. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will make further detailed description to the utility model combining with the drawings and examples.
[0026] As Figures 1-5The application discloses a novel structure of a star-angle conversion dual-voltage transformer, which comprises a transformer body 100, a switching switch 101 and a tap voltage regulating switch 102. The transformer body 100 comprises high-voltage coils A, B and C, the three-phase winding direction structures of the high-voltage coils A, B and C are completely same, the high-voltage coil A is provided with tap terminals one X6, two X4, three X2, four X3, five X5, six X7 and seven X9, the high-voltage coil B is provided with tap terminals one Y6, two Y4, three Y2, four Y3, five Y5, six Y7 and seven Y9, and the high-voltage coil C is provided with tap terminals one Z6, two Z4, three Z2, four Z3, five Z5, six Z7 and seven Z9. The switching switch 101 is provided with terminals two X3, six Y3 and ten Z3 which are short-circuited, the coil first terminal of the high-voltage coil A is connected with the terminal twelve Z5 of the switching switch 101, the coil first terminal of the high-voltage coil B is connected with the terminal four X5 of the switching switch 101, the coil first terminal of the high-voltage coil C is connected with the terminal eight Y5 of the switching switch 101, the tap terminal seven X9 of the high-voltage coil A is connected with the terminal three X4 of the switching switch 101, the tap terminal seven Y9 of the high-voltage coil B is connected with the terminal seven Y4 of the switching switch 101, the tap terminal seven Z9 of the high-voltage coil C is connected with the terminal eleven Z4 of the switching switch 101, the tap terminal six X7 of the high-voltage coil A is connected with the terminal one X2 of the switching switch 101, the tap terminal six Y7 of the high-voltage coil B is connected with the terminal five Y2 of the switching switch 101, the tap terminal six Z7 of the high-voltage coil C is connected with the terminal nine Z2 of the switching switch 101, the tap terminal six X7 of the high-voltage coil A, the tap terminal six Y7 of the high-voltage coil B and the tap terminal six Z7 of the high-voltage coil C are connected with the three terminals six D7 in the tap voltage regulating switch 102 respectively, the tap terminal one X6 of the high-voltage coil A, the tap terminal one Y6 of the high-voltage coil B and the tap terminal one Z6 of the high-voltage coil C are connected with the three terminals five D6 in the tap voltage regulating switch 102 respectively, the tap terminal two X4 of the high-voltage coil A, the tap terminal two Y4 of the high-voltage coil B and the tap terminal two Z4 of the high-voltage coil C are connected with the three terminals three D4 in the tap voltage regulating switch 102 respectively, and the tap terminal three X2 of the high-voltage coil A, the tap terminal three Y2 of the high-voltage coil B and the tap terminal three Z2 of the high-voltage coil C are connected with the three terminals one D2 in the tap voltage regulating switch 102 respectively.The tap four X3 of the high-voltage coil A, the tap four Y3 of the high-voltage coil B and the tap four Z3 of the high-voltage coil C are connected with three joints two D3 in the tap voltage regulating switch 102 respectively, and the tap five X5 of the high-voltage coil A, the tap five X5 of the high-voltage coil B and the tap five X5 of the high-voltage coil C are connected with three joints four D5 in the tap voltage regulating switch 102 respectively.
[0027] The voltage regulating principle of the utility model is: when the switch 101 is switched to 1, the switch connects the tap X2X3, Y2Y3, Z2Z3, and the 10 and 0.4 voltage ratio of the connection group Yyn0 can be realized; when the switch 101 is switched to 3, the switch connects the tap X2X7, Y2Y7, Z2Z7, and the 6 and 0.4 voltage ratio of the connection group Dyn11 can be realized; namely, the conversion of the 10kV (Y) and 6kV (D) voltage levels of the primary side of a single transformer can be realized, and the voltage ratio is accurate (deviation is within 0.25%), on the basis of the ordinary distribution transformer, only by increasing a no excitation tap switch and the adjustment of the high-voltage coil turns, the change of the tap, the optimization of the high-voltage lead, the conversion of the single double-voltage star angle is realized, the structure is simple, convenient operation, and the processing cost is low, and the new transformer does not need to be purchased due to the conversion of the voltage level.
[0028] The above is only the specific embodiment of the application, but the protection scope of the application is not limited to this, any skilled person in the art can easily think of the change or replacement within the technical range disclosed by the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.
Claims
1. A novel structure of star-delta conversion dual-voltage transformer, comprising a transformer body (100), a switching switch (101) and a tapping voltage regulating switch (102), characterized in that, The transformer body (100) comprises high-voltage coil A, high-voltage coil B and high-voltage coil C, and the three-phase winding structures of the high-voltage coil A, the high-voltage coil B and the high-voltage coil C are completely same.
2. A novel construction of star-delta conversion dual voltage transformer according to claim 1, characterized in that, The high-voltage coil A is provided with tap one X6, tap two X4, tap three X2, tap four X3, tap five X5, tap six X7 and tap seven X9; the high-voltage coil B is provided with tap one Y6, tap two Y4, tap three Y2, tap four Y3, tap five Y5, tap six Y7 and tap seven Y9; and the high-voltage coil C is provided with tap one Z6, tap two Z4, tap three Z2, tap four Z3, tap five Z5, tap six Z7 and tap seven Z9.
3. A novel structure of star-delta conversion dual voltage transformer according to claim 2, characterized in that, The switching switch (101) is provided with tap one X2, tap two X3, tap three X4, tap four X5, tap five Y2, tap six Y3, tap seven Y4, tap eight Y5, tap nine Z2, tap ten Z3, tap eleven Z4 and tap twelve Z5; and the tap voltage regulating switch (102) is provided with three tap one D2, three tap two D3, three tap three D4, three tap four D5, three tap five D6 and three tap six D7.
4. A novel construction of star-delta conversion dual voltage transformer according to claim 3, characterized in that, The coil first tap of the high-voltage coil A is connected with the tap twelve Z5 of the switching switch (101), the coil first tap of the high-voltage coil B is connected with the tap four X5 of the switching switch (101), the coil first tap of the high-voltage coil C is connected with the tap eight Y5 of the switching switch (101), the tap seven X9 of the high-voltage coil A is connected with the tap three X4 of the switching switch (101), the tap seven Y9 of the high-voltage coil B is connected with the tap seven Y4 of the switching switch (101), and the tap seven Z9 of the high-voltage coil C is connected with the tap eleven Z4 of the switching switch (101).
5. The novel structure of star-delta conversion dual voltage transformer according to claim 1, characterized in that, The tap six X7 of the high-voltage coil A is connected with the tap one X2 of the switching switch (101), the tap six Y7 of the high-voltage coil B is connected with the tap five Y2 of the switching switch (101), and the tap six Z7 of the high-voltage coil C is connected with the tap nine Z2 of the switching switch (101).
6. The novel structure of star-delta conversion dual voltage transformer according to claim 1, characterized in that, The tap six X7 of the high-voltage coil A, the tap six Y7 of the high-voltage coil B and the tap six Z7 of the high-voltage coil C are respectively connected with the three tap six D7 in the tap voltage regulating switch (102).
7. The novel structure of star-delta conversion dual voltage transformer according to claim 1, characterized in that, The tap one X6 of the high voltage coil A, the tap one Y6 of the high voltage coil B and the tap one Z6 of the high voltage coil C are connected with three terminals five D6 in the tap voltage regulating switch (102) respectively, the tap two X4 of the high voltage coil A, the tap two Y4 of the high voltage coil B and the tap two Z4 of the high voltage coil C are connected with three terminals three D4 in the tap voltage regulating switch (102) respectively, the tap three X2 of the high voltage coil A, the tap three Y2 of the high voltage coil B and the tap three Z2 of the high voltage coil C are connected with three terminals one D2 in the tap voltage regulating switch (102) respectively, the tap four X3 of the high voltage coil A, the tap four Y3 of the high voltage coil B and the tap four Z3 of the high voltage coil C are connected with three terminals two D3 in the tap voltage regulating switch (102) respectively, the tap five X5 of the high voltage coil A, the tap five X5 of the high voltage coil B and the tap five X5 of the high voltage coil C are connected with three terminals four D5 in the tap voltage regulating switch (102) respectively.
8. The novel structure of star-delta conversion dual voltage transformer according to claim 1, characterized in that, The terminal two X3, the terminal six Y3 and the terminal ten Z3 in the switch (101) are short-circuited.
9. The novel structure of star-delta conversion dual voltage transformer according to claim 1, characterized in that, The switch (101) is a common three-tap non-saturable switch.