High-voltage grid-connected transformer for power generation

Abstract

The utility model belongs to the technical field of transformers, and particularly relates to a high-voltage grid-connected transformer for power generation, which comprises a GIS (gas insulated switchgear), a box transformer step-up transformer and a low-voltage chamber, the GIS is arranged on one side of the box transformer step-up transformer, and the low-voltage chamber is arranged at the bottom of the box transformer step-up transformer. The low-voltage chamber comprises a low-voltage wire inlet cabinet, a low-voltage auxiliary cabinet and a high-voltage control cabinet, the low-voltage wire inlet cabinet, the low-voltage auxiliary cabinet and the high-voltage control cabinet are sequentially arranged and connected, and the primary side voltage grade is improved, the sectional area of a transmission cable is reduced, line loss and voltage drop are reduced, the line construction cost is reduced, and the transmission radius of electric energy is increased; the system effectively enlarges the coverage range of a photovoltaic and wind power electric field, improves the electric energy absorption capability, effectively enlarges the photovoltaic and wind power transmission distance, and solves the problems of low primary side voltage, short network transmission distance, small coverage range and limited absorption capability of a transformer substation in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field, concretely is a kind of high voltage grid-connected transformer for power generation. BACKGROUND

[0002] At present, high voltage grid-connected transformer for power generation is a kind of key equipment specially used for the connection of power station and power grid, which can effectively convert the high voltage electric energy generated by power station into voltage level suitable for power grid transmission, so as to realize the stable and efficient grid transmission of electric energy. This kind of transformer not only has the characteristics of high voltage and large capacity, but also has excellent electrical performance and insulation performance to ensure the safe and stable operation of power grid.

[0003] Solar distributed photovoltaic power generation and wind power generation are two kinds of new power generation systems. Both of these two kinds of power generation systems use renewable energy as the main energy source, directly convert light energy or wind energy into electric energy for transmission. Combined with huashi box-type substation, these power generation processes will not produce any harmful gas and will not emit any pollution, have the advantages of sustainable supply, cleanliness, safety and no noise, and have great significance in terms of protecting the earth's environment and solving the crisis of one-time resource shortage. At present, the annual increase in installed capacity of photovoltaic power generation and wind power generation in our country accounts for about half of the global total, and by the end of 2021, renewable energy power generation installed capacity in China accounts for 1 / 3 of the global total, and photovoltaic installed capacity accounts for 36% of the global total. Therefore, it is urgent to increase the demand for photovoltaic and wind power installed capacity combined with huashi box-type substation.

[0004] Huashi box-type substation receives electric energy from photovoltaic and wind power systems and boosts it to 35kV voltage level, which is transmitted to the main transformer low voltage side of the electric field through the power collection line. The main transformer further boosts the voltage level to 66kV (110kV) or 220kV voltage level and sends it into the power grid. However, the high voltage 35kV voltage level of huashi box-type substation cannot be transmitted over long distances, which leads to small coverage of photovoltaic and wind power field, thereby limiting the installed capacity and installed capacity of the field; At the same time, it also limits the sending distance of distributed photovoltaic power generation and wind power generation, which cannot meet the policy requirements of on-site installation, scattered access and on-site consumption of the current actively advocated distributed photovoltaic power generation and wind power generation industry, and restricts the development of China's photovoltaic power generation and wind power generation industry. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of high voltage grid-connected transformer for power generation, solve the problem of substation primary side voltage, network transmission distance is short, coverage is small, and the problem of limited consumption capacity.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-voltage grid-connected transformer for power generation, comprising a GIS combined electrical appliance, a transformer substation step-up transformer, and a low-voltage compartment, wherein the GIS combined electrical appliance is disposed on one side of the transformer substation step-up transformer, and the low-voltage compartment is disposed at the bottom of the transformer substation step-up transformer.

[0007] Preferably, the low-voltage room includes a low-voltage incoming cabinet, a low-voltage auxiliary cabinet, and a high-voltage control cabinet, which are arranged and connected in sequence.

[0008] Preferably, the low-voltage incoming cabinet and the low-voltage auxiliary cabinet include an intelligent frame circuit breaker, a low-voltage current transformer, a surge protector, a microprocessor-based monitoring and control protection device, an uninterruptible power supply system, a molded case circuit breaker, an environmental intelligent manager, a transformer low-voltage bushing, and an SG11 type auxiliary dry-type transformer. The uninterruptible power supply system is installed on one side of the low-voltage incoming cabinet, the intelligent frame circuit breaker, the surge protector, and the transformer low-voltage bushing are installed on the low-voltage incoming cabinet, and the microprocessor-based monitoring and control protection device, the environmental intelligent manager, the molded case circuit breaker, and the SG11 type auxiliary dry-type transformer are installed on the low-voltage auxiliary cabinet.

[0009] Preferably, the GIS combined electrical appliance is modularly combined into a whole, consisting of a high-voltage circuit breaker, a current transformer, a high-voltage disconnector, a high-voltage voltage transformer, and a phase collector, and is installed at the front end of the transformer of the substation. The transformer of the substation and the transformer of the GIS combined electrical appliance are connected by a high-voltage side oil-gas bushing.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] 1. This invention improves the coverage of photovoltaic and wind farms by increasing the primary voltage level, reducing the cross-sectional area of ​​transmission cables, reducing line loss and voltage drop, reducing line construction costs, increasing the power transmission radius, improving the power absorption capacity, and effectively increasing the transmission distance of photovoltaic and wind power.

[0012] 2. The voltage level meets the requirements for direct grid connection. After passing through the primary side protection and control system, it can be directly transmitted to the power grid, saving the cost of building a step-up substation.

[0013] 3. Reducing one intermediate substation step improves the efficiency of the power transmission system and enhances the economic benefits of the power grid. Attached Figure Description

[0014] Fig. 1 This is a top view of the overall structure of this utility model;

[0015] Fig. 2 This is a schematic diagram of the internal structure of the low-pressure chamber of this utility model.

[0016] In the diagram: 1. GIS switchgear; 2. High-voltage circuit breaker; 3. Current transformer; 4. High-voltage disconnector; 5. High-voltage voltage transformer; 6. Phase collector; 7. Substation step-up transformer; 8. High-voltage side oil and gas bushing.

[0017] 9. Low-voltage incoming line cabinet; 10. Low-voltage auxiliary cabinet; 11. High-voltage control cabinet; 12. Intelligent frame circuit breaker; 13. Low-voltage current transformer; 14. Surge protector; 15. Microcomputer measurement and control protection device;

[0018] 16. Uninterruptible power supply system; 17. Molded case circuit breaker; 18. Environmental intelligent manager; 19. SG11 type auxiliary dry-type transformer; 20. Transformer low-voltage bushing; 21. Low-voltage compartment. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figs. 1-2 A high-voltage grid-connected transformer for power generation includes a GIS combined electrical unit 1, a transformer substation step-up transformer 7, and a low-voltage compartment 21. The GIS combined electrical unit 1 is located on one side of the transformer substation step-up transformer 7, and the low-voltage compartment 21 is located at the bottom of the transformer substation step-up transformer 7. The low-voltage compartment 21 includes a low-voltage incoming cabinet 9, a low-voltage auxiliary cabinet 10, and a high-voltage control cabinet 11, which are arranged and connected in sequence. The low-voltage incoming cabinet 9 and the low-voltage auxiliary cabinet 10 include an intelligent frame circuit breaker, a low-voltage current transformer 13, a surge protector 14, a microcomputer-based monitoring and protection device 15, an uninterruptible power supply system 16, a molded case circuit breaker 17, an environmental intelligent manager 18, and a transformer low-voltage bushing 20. The SG11 type auxiliary dry-type transformer 19 and the uninterruptible power supply system 16 are installed on one side of the low-voltage incoming cabinet 9. The intelligent frame circuit breaker 12, surge protector 14 and transformer low-voltage bushing 20 are installed on the low-voltage incoming cabinet 9. The microcomputer measurement and control protection device 15, environmental intelligent manager 18, molded case circuit breaker 17 and SG11 type auxiliary dry-type transformer 19 are installed on the low-voltage auxiliary cabinet 10. The GIS combined electrical appliance 1 is modularly combined into a whole by the high-voltage circuit breaker 2, current transformer 3, high-voltage disconnect switch 4, high-voltage voltage transformer 5 and phase collector 6. It is installed at the front end of the transformer substation step-up transformer 7. The transformer substation step-up transformer 7 and the GIS combined electrical appliance 1 transformer are connected by the high-voltage side oil and gas bushing 8.

[0021] The specific implementation process of this utility model is as follows: In substations, GIS combined electrical appliances can promptly detect and handle equipment faults, reduce safety accidents caused by improper on-site operation, improve space utilization and installation and maintenance efficiency through a compact structural design, and enhance operational reliability by having all live parts enclosed in a metal casing with strong anti-interference capabilities.

[0022] The low-voltage compartment includes the low-voltage incoming switchgear and the low-voltage auxiliary switchgear:

[0023] 1. Main equipment of low-voltage incoming switchgear:

[0024] Low-voltage circuit breakers: When a circuit experiences a short circuit, severe overload, or loss of voltage, they can automatically disconnect the faulty circuit, effectively protecting the electrical equipment connected in series with them.

[0025] Current transformer: Converts high current into low current to facilitate measurement and protect low-voltage circuits.

[0026] Surge protectors: These devices direct surge voltages or currents in a power system to ground, thereby preventing these overvoltages or currents from passing through the protected electrical equipment and effectively protecting the equipment from damage.

[0027] Knife fuse switch: can effectively switch on and off load current and provide short circuit protection.

[0028] Voltage transformers: enable the metering of electricity, compressing the high-voltage power grid into the voltage range that the low-voltage incoming cabinet can withstand, thus enabling electricity metering and management.

[0029] Multifunctional meter: Provides comprehensive monitoring, diagnosis, and power management for system power quality. It features full power measurement, power statistics, power quality analysis, and network communication capabilities.

[0030] 2. Main equipment of low-voltage auxiliary cabinet:

[0031] Intelligent monitoring device: Real-time online monitoring of the operating status of the box-type transformer; timely detection and alarm of equipment faults through data analysis; recording and analyzing equipment operating data to provide data support for subsequent maintenance and management. It also features remote control functionality, allowing for remote operation of the equipment and improving operational efficiency.

[0032] Isolation transformer: Provides protection and control power for the entire transformer substation system, ensuring the normal operation of the equipment inside the substation.

[0033] Uninterruptible power supply (UPS): Provides protection and control power for major equipment, ensuring uninterrupted power supply and providing power guarantee for the equipment.

[0034] Power environment controller: Based on the current temperature and humidity, it promptly activates dehumidification and heating equipment to prevent condensation formation and protect high-voltage or low-voltage switchgear from the effects of temperature and humidity changes. When the transformer has been running for too long and the temperature has risen, the power environment controller can activate the exhaust system for heat dissipation, ensuring that the transformer operates at a suitable temperature. By monitoring and controlling environmental conditions, the power environment controller can also provide a certain degree of safety protection, such as preventing fires caused by equipment overheating. By increasing the primary voltage level, reducing the cross-sectional area of ​​transmission cables, reducing line losses and voltage drops, reducing line construction costs, increasing the power transmission radius, effectively expanding the coverage of photovoltaic and wind farms, improving power absorption capacity, and effectively increasing the transmission distance of photovoltaic and wind power.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage grid-connected transformer for power generation, comprising a GIS switchgear (1), a transformer substation step-up transformer (7), and a low-voltage compartment (21), characterized in that: The GIS combined electrical appliance (1) is installed on one side of the transformer substation step-up transformer (7), and the low-voltage chamber (21) is installed at the bottom of the transformer substation step-up transformer (7).

2. The high-voltage grid-connected transformer for power generation according to claim 1, characterized in that: The low-voltage room (21) includes a low-voltage incoming cabinet (9), a low-voltage auxiliary cabinet (10), and a high-voltage control cabinet (11), which are arranged and connected in sequence.

3. A high-voltage grid-connected transformer for power generation according to claim 2, characterized in that: The low-voltage incoming cabinet (9) and the low-voltage auxiliary cabinet (10) include an intelligent frame circuit breaker (12), a low-voltage current transformer (13), a surge protector (14), a microcomputer-controlled monitoring and protection device (15), an uninterruptible power supply system (16), a molded case circuit breaker (17), an environmental intelligent manager (18), a transformer low-voltage bushing (20), and an SG11 type auxiliary dry-type transformer (19). The uninterruptible power supply system (16) is installed on one side of the low-voltage incoming cabinet (9). The intelligent frame circuit breaker (12), the surge protector (14), and the transformer low-voltage bushing (20) are installed on the low-voltage incoming cabinet (9). The microcomputer-controlled monitoring and protection device (15), the environmental intelligent manager (18), the molded case circuit breaker (17), and the SG11 type auxiliary dry-type transformer (19) are installed on the low-voltage auxiliary cabinet (10).

4. A high-voltage grid-connected transformer for power generation according to claim 1, characterized in that: The GIS combined electrical appliance (1) is modularly combined into a whole by a high-voltage circuit breaker (2), a current transformer (3), a high-voltage disconnect switch (4), a high-voltage voltage transformer (5), and a phase collector (6). It is installed at the front end of the transformer substation step-up transformer (7). The transformer substation step-up transformer (7) and the GIS combined electrical appliance (1) transformer are connected by a high-voltage side oil and gas bushing (8).

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