CN215342276U - High-capacity combined transformer - Google Patents
High-capacity combined transformer Download PDFInfo
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- CN215342276U CN215342276U CN202121395173.XU CN202121395173U CN215342276U CN 215342276 U CN215342276 U CN 215342276U CN 202121395173 U CN202121395173 U CN 202121395173U CN 215342276 U CN215342276 U CN 215342276U
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Abstract
The utility model discloses a high-capacity combined transformer, which belongs to the technical field of transformers and is characterized by comprising the following components in parts by weight: the high-voltage fusing protection module comprises two groups of full-range high-voltage fuses which are connected in parallel; the two full-range high-voltage fuses of each phase are divided into groups with equal internal resistance and matched in groups; the transformer comprises high-voltage chambers and low-voltage chambers which are distributed in a finished product shape, wherein full-range high-voltage fuses and high-voltage load switches are symmetrically arranged on the left side and the right side of the transformer, the full-range high-voltage fuses are independently placed in a full-range high-voltage fuse operating box, an off-circuit tap switch, a pressure release valve, an oil level gauge, a pressure gauge and the high-voltage load switches are placed in the high-voltage load switches and a protection component operating box, and a low-voltage frame circuit breaker is integrated in a low-voltage cabinet in the low-voltage chamber. This application is through high low voltage protection switch allies oneself with the jump scheme, realizes the chain function of five preventions of box-type substation, uses through the fuse is parallelly connected, has broken through the restriction of the maximum rated current of full range high voltage fuse.
Description
Technical Field
The utility model belongs to the technical field of transformers, and particularly relates to a high-capacity combined transformer.
Background
The combined transformer is commonly called as American box transformer, oil-immersed high-voltage load switches and protection switches such as full-range high-voltage fuses are installed in a box body of the transformer, the combined transformer has the advantages of compact structure, strong environmental applicability, convenience in installation, low investment and the like, and is an optimal solution for comprehensively considering the problems of Total Ownership Cost (TOC), space, safety and energy efficiency. The method is widely applied to the technical field of new energy.
The combined transformer has the advantage of incomparable Europe. The European transformer function type prefabricated substation occupies a large space, the foundation cost of the substation is high, and the cost of the prefabricated substation is higher than that of the American combined transformer. However, the combined transformer also has the following inherent defects:
one is as follows: the combined transformer high-low voltage protection switch does not have a combined tripping function and cannot realize an electrical five-prevention function.
The second step is as follows: at present, the full-range high-voltage fuse integrates overload protection and backup short-circuit protection in a fusion tube, realizes the functions of overload and short-circuit protection of a transformer, and is used as a high-voltage main protection component of a combined transformer. The maximum rated current specification of the current full-range high-voltage fuse is 100A. The protection requirements of the combined transformer with the capacity of 1250kVA or below in the 10kV grade and the combined transformer with the capacity of 3150kVA or below in the 35kV grade are only met. Due to the fact that the capacity of a fan and the capacity of a photovoltaic inverter are larger and larger in the existing new energy field, the combined transformer cannot meet the market demand.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a high-capacity combined transformer, which realizes a high-low voltage protection switch combined tripping scheme and a five-prevention interlocking function of a box-type substation, and breaks through the limitation of the maximum rated current of a full-range high-voltage fuse by using fuses in parallel.
In order to achieve the above object, an object of the present invention is to provide a high capacity combined transformer, at least comprising:
the high-voltage fusing protection module comprises two groups of full-range high-voltage fuses which are connected in parallel; 2 full-range high-voltage fuses in each phase are divided into groups with equal internal resistance and matched in groups;
the transformer comprises high-voltage chambers and low-voltage chambers which are distributed in a finished product shape, wherein the full-range high-voltage fuses and the high-voltage load switches are symmetrically arranged on the left side and the right side of the transformer, the full-range high-voltage fuses are independently placed in a high-voltage fuse operation box, and the non-excitation tap switch, the pressure release valve, the oil level gauge, the pressure gauge and the high-voltage load switches are placed in a high-voltage load switch and protection component operation box.
Preferably: the high-voltage fusing protection module adopts 6 full-range high-voltage fuses of 2 and A, B, C per phase, 3 are arranged above and 3 are arranged below, and the high-voltage fusing protection module is arranged on the upper part of the transformer body.
Preferably: when a short circuit or overload fault occurs inside the transformer, the high-voltage fuse in a certain phase full range is subjected to fusing protection, meanwhile, the high-voltage fuse in the full range sends a fusing signal to the low-voltage frame circuit breaker, the low-voltage frame circuit breaker receives the fusing signal of the high-voltage fuse in the full range, the low-voltage frame circuit breaker generates a tripping instruction, a load loop is disconnected, a tripping state signal is sent to the time relay, the time relay sends an instruction in a delayed mode, an electric operating mechanism of the high-voltage load switch is started, a high-voltage three-phase circuit of the combined transformer is cut off, and the transformer is completely separated from the system.
Compared with the prior art, the utility model has the beneficial effects that:
firstly, the method comprises the following steps: the method and the device eliminate the defect that the three phases of the high-voltage side main protection full-range high-voltage fuse of the combined transformer cannot be effectively separated from the power transmission line when not completely fused.
II, secondly: according to the scheme of the high-voltage fusing protection module with the parallel structure, the limitation of the maximum rated current of 100A of a full-range high-voltage fuse is broken through, and the maximum capacity of the combined transformer is expanded to 5500kVA or below.
Thirdly, the method comprises the following steps: through the structural layout, the life safety of field operators can be effectively protected.
Drawings
FIG. 1 is an electrical schematic of a preferred embodiment of the present invention;
FIG. 2 is a front view of the preferred embodiment of the present invention;
FIG. 3 is a top view of a preferred embodiment of the present invention;
FIG. 4 is a left side view of the preferred embodiment of the present invention;
FIG. 5 is a right side view of the preferred embodiment of the present invention;
in the figure: 1. a high voltage fuse operation box; 2. a full range high voltage fuse; 3. a transformer body; 4. a high-voltage load switch and protection component operation box; 5. a high voltage load switch; 6. a low voltage frame circuit breaker; 7. a transformer; 8. a high pressure chamber; 9. a low pressure chamber; 10. an off-circuit tap changer; 11. a pressure gauge; 12. a pressure relief valve; 13. an oil level gauge.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, the present invention provides a technical solution:
a high capacity modular transformer comprising:
a transformer body 3;
the high-voltage fusing protection module comprises two groups of full-range high-voltage fuses 2 which are connected in parallel; the internal resistances of two full-range high-voltage fuses of each phase are approximately equal and are matched in groups;
the high-voltage fuse protector comprises a high-voltage chamber 8 and a low-voltage chamber 9 which are arranged in a finished product shape, wherein the full-range high-voltage fuse protector and a high-voltage load switch 5 are symmetrically arranged on the left side and the right side of a transformer 7, the full-range high-voltage fuse protector is independently arranged in a high-voltage fuse protector operating box 1, and an off-circuit tap changer 10, a pressure release valve 12, an oil level indicator 13, a pressure gauge 11 and the high-voltage load switch are arranged in a high-voltage load switch and protection component operating box 4; wherein: when a short circuit or overload fault occurs inside the transformer, the high-voltage fuse in a certain phase full range is subjected to fusing protection, the high-voltage fuse in the full range sends a fusing signal to the low-voltage frame circuit breaker 6, the low-voltage frame circuit breaker receives the fusing signal of the high-voltage fuse in the full range, the low-voltage frame circuit breaker generates a tripping instruction, a load loop is disconnected, a tripping state signal is sent to the time relay, the time relay sends an instruction in a delayed mode, an electric operating mechanism of the high-voltage load switch is started, a high-voltage three-phase circuit of the combined transformer is cut off, and the transformer is completely separated from the system.
When a fault such as short circuit or overload occurs inside the transformer 7, a certain phase full-range high-voltage fuse (RD) is subjected to fusing protection, meanwhile, the full-range high-voltage fuse (RD) sends a fusing signal to a low-voltage frame Circuit Breaker (CB), the low-voltage frame Circuit Breaker (CB) receives the full-range high-voltage fuse (RD) fusing signal, the low-voltage frame Circuit Breaker (CB) generates a tripping command, a load loop is disconnected, a tripping state signal is sent to a time relay, the time relay sends a command in a delayed mode, an electric operating mechanism (M) of a high-voltage load switch (QL) is started, a high-voltage three-phase circuit of the combined transformer is cut off, the transformer is completely separated from a system, the fault is prevented from being enlarged, and the transformer can be protected from being damaged by external faults.
The utility model (utility model) is shown in figure 2,
one is as follows: the high-capacity combined transformer adopts a high-voltage fusing protection module with a structure that 2 groups of full-range high-voltage fuses (RD for short) are connected in parallel, 2 full-range high-voltage fuses of A, B, C are adopted in each phase, 3 high-voltage fusing protection modules are arranged under the upper part of the transformer body and form the high-voltage fusing protection module, the rated current of the full-range high-voltage fuses is doubled, the shared currents of the 2 full-range high-voltage fuses are approximately the same through approximately equal grouping and matching of the internal resistances of the 2 full-range high-voltage fuses in each phase, and product faults caused by current sharing errors are prevented. When any one of the full-range high-voltage fuses (RD for short) is subjected to fusing protection action, the electrical principle can be completed, the transformer is completely separated from the system, and the fault is prevented from being enlarged.
The second step is as follows: the high-capacity combined transformer, the high-voltage chamber and the low-voltage chamber are arranged in a finished product shape, a full-range high-voltage fuse (RD) and a high-voltage load switch (QL) are symmetrically arranged on the left side and the right side of the transformer, the full-range high-voltage fuse (RD) is independently arranged in an assembly box, and a protection assembly such as a non-excitation tap switch, a pressure release valve, an oil level gauge, a pressure gauge and the like and the high-voltage load switch (QL) are arranged in an assembly box on the opposite side. Through the structural layout, the phenomenon that operators are injured due to abnormal explosion and fusion faults of a full-range high-voltage fuse (RD for short) when the combined transformer is switched on and switched off can be effectively prevented, and the life safety of field operators is effectively protected.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A high capacity modular transformer, characterized by comprising at least:
the high-voltage fusing protection module comprises two groups of full-range high-voltage fuses which are connected in parallel; the two full-range high-voltage fuses of each phase are divided into groups with equal internal resistance and matched in groups;
the transformer comprises a high-voltage chamber and a low-voltage chamber which are distributed in a finished product shape, wherein the full-range high-voltage fuse and a high-voltage load switch are symmetrically arranged on the left side and the right side of the transformer, the full-range high-voltage fuse is independently placed in a full-range high-voltage fuse operation box, an off-circuit tap switch, a pressure release valve, an oil level gauge, a pressure gauge and the high-voltage load switch are placed in a high-voltage load switch and a protection component operation box, and a low-voltage frame circuit breaker is integrated in the low-voltage chamber and the low-voltage cabinet.
2. A high capacity combined transformer as claimed in claim 1, wherein: the high-voltage fusing protection module adopts 6 full-range high-voltage fuses of 2 and A, B, C per phase, 3 are arranged above and 3 are arranged below, and the high-voltage fusing protection module is arranged on the upper part of the transformer body.
3. A high capacity combined transformer as claimed in claim 1, wherein: when a short circuit or overload fault occurs inside the transformer, the high-voltage fuse in a certain phase full range is subjected to fusing protection, meanwhile, the high-voltage fuse in the full range sends a fusing signal to the low-voltage frame circuit breaker, the low-voltage frame circuit breaker receives the fusing signal of the high-voltage fuse in the full range, the low-voltage frame circuit breaker generates a tripping instruction, a load loop is disconnected, a tripping state signal is sent to the time relay, the time relay sends an instruction in a delayed mode, an electric operating mechanism of the high-voltage load switch is started, a high-voltage three-phase circuit of the combined transformer is cut off, and the transformer is completely separated from the system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121395173.XU CN215342276U (en) | 2021-06-22 | 2021-06-22 | High-capacity combined transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121395173.XU CN215342276U (en) | 2021-06-22 | 2021-06-22 | High-capacity combined transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215342276U true CN215342276U (en) | 2021-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121395173.XU Active CN215342276U (en) | 2021-06-22 | 2021-06-22 | High-capacity combined transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215342276U (en) |
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2021
- 2021-06-22 CN CN202121395173.XU patent/CN215342276U/en active Active
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