A wind-driven generator box transformer automatic closing and starting system

Abstract

The utility model provides a kind of wind-driven generator box transformer automatic closing starting system, including the box transformer being arranged on 35kV collection line, and its high voltage side and low voltage side are electrically connected high voltage side circuit breaker and low voltage side circuit breaker respectively;Box transformer self-use transformer, its input end is connected to low voltage side circuit breaker upper mouth;And control loop being arranged in the output end of box transformer self-use transformer, for controlling its output end closure.Control loop is equipped with air switch, manual closing switch, low voltage side switch closing coil, delay closing switch is connected in parallel with manual closing switch, and it can be electromagnetic or electronic time relay, and its closing signal is connected in parallel with low voltage side switch manual closing switch.The utility model solves the many drawbacks of traditional manual closing operation, can realize automatic closing starting, improve closing accuracy, timeliness and system stability, meet the needs of automation management, have manual backup function, improve wind power generation system operating efficiency.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and more specifically, to an automatic closing and starting system for a wind turbine generator box transformer. Background Technology

[0002] In the field of wind power generation, the prefabricated substation, as a key device connecting wind turbine generators to the power grid, plays a crucial role in the stable operation of the entire wind power generation system through its closing and starting process. Traditional wind turbine prefabricated substation closing and starting methods have some shortcomings, posing challenges to the efficient and stable operation of wind power generation.

[0003] After the 35kV collection line loses power, the low-voltage side of the transformer substation and the wind turbine lose power supply, the control system and communication system lose power, and the remote operation and monitoring capabilities are lost.

[0004] In some conventional wind power systems, the closing operation of transformer substations often relies on manual operation. This method is not only labor-intensive, but also difficult to respond quickly to emergencies or when dealing with numerous transformer substations in a large-scale wind farm, easily leading to prolonged power outages and reduced power generation efficiency. For example, when power is restored after a brief grid failure, operators need to close each transformer substation individually, which results in a significant time delay and prevents timely restoration of power generation. Utility Model Content

[0005] This utility model aims to provide an automatic closing and starting system for wind turbine generator box-type transformers to solve the above-mentioned technical problems, including:

[0006] An automatic closing and starting system for a wind turbine generator box-type transformer includes:

[0007] The box-type transformer is installed on a 35kV busbar. The high-voltage side and the low-voltage side of the box-type transformer are electrically connected to a high-voltage side circuit breaker and a low-voltage side circuit breaker, respectively.

[0008] The input terminal of the transformer for the self-use of the substation is connected to the upper port of the low-voltage side circuit breaker.

[0009] The control circuit is set at the output terminal of the transformer for the substation's own use, and is used to control the closing of the output terminal of the transformer for the substation's own use.

[0010] Preferably, the control circuit includes an air switch, a manual closing switch, and a low-voltage side switch closing coil. The air switch is located between the low-voltage side switch and the low-voltage side closing button. The manual closing switch is located between the air switch and the low-voltage side switch closing coil. The time-delay closing switch is connected in parallel with the manual closing switch.

[0011] Preferably, the time-delay closing switch is an electromagnetic time relay or an electronic time relay.

[0012] Preferably, the closing signal of the delayed closing switch is connected in parallel with the manual closing switch of the low-voltage side switch.

[0013] Beneficial effects:

[0014] 1. Improved automation: Through the coordinated work of the voltage detection module and the control module, the transformer substation can be automatically switched on and started when the grid voltage is restored, which greatly reduces manual intervention, improves the automation level of the wind power generation system, and reduces labor costs;

[0015] 2. Ensure equipment safety: The delayed closing switch setting allows the transformer to close the circuit breaker only after the grid voltage has stabilized, effectively avoiding the impact on the transformer and related equipment caused by unstable voltage closing, extending the service life of the equipment, and reducing equipment maintenance costs and failure risks.

[0016] 3. Precise control of closing time: The delay time of the delayed closing switch can be set within a reasonable range of 5-8 seconds, which can ensure that the power generation is restored at the appropriate time and avoid problems caused by closing too early or too late, thereby improving power generation efficiency and system stability.

[0017] 4. Enhanced system reliability and flexibility: The reasonable setting of various switches in the control circuit, as well as the parallel connection of the delayed closing switch and the manual closing switch, enables the system to have both automatic closing function and retain the redundancy of manual operation. This ensures that the transformer substation can be successfully closed and started under different conditions, thereby improving the system's reliability and operational flexibility. Attached Figure Description

[0018] Figure 1 An electrical system diagram of this utility model is shown;

[0019] In the attached diagram, 1 is a box-type transformer, 2 is a box-type transformer for the transformer's own use, 3 is a high-voltage side circuit breaker, 4 is a low-voltage side circuit breaker, 5 is an air switch, 6 is a manual closing switch, 7 is a low-voltage side switch closing coil, and 8 is a time-delay closing switch. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] like Figure 1 The system shown is an automatic closing and starting system for a wind turbine generator box-type transformer. The system mainly consists of three parts: a box-type transformer 1 and a control circuit.

[0022] Box-type transformer 1: Box-type transformer 1 is installed on a 35kV busbar. Its high-voltage side and low-voltage side are electrically connected to a high-voltage side circuit breaker 3 and a low-voltage side circuit breaker 4, respectively. The high-voltage side circuit breaker 3 is used to control the connection and disconnection between the high-voltage side of box-type transformer 1 and the 35kV busbar. When the power grid fails or needs maintenance, it can quickly disconnect the high-voltage circuit to protect box-type transformer 1 and other equipment from high-voltage impact. The low-voltage side circuit breaker 4 is responsible for controlling the connection between the low-voltage side of box-type transformer 1 and subsequent electrical equipment. When the low-voltage circuit experiences overload, short circuit or other abnormal conditions, it can promptly disconnect the circuit to ensure the safety of electrical equipment.

[0023] As the core component of the entire system, the box-type transformer 1 plays a crucial role in voltage transformation and power distribution, converting 35kV high-voltage electricity into low-voltage electricity suitable for wind turbines and other equipment, ensuring stable power transmission and effective utilization.

[0024] Transformer 2 for self-use in the transformer substation: The input terminal of transformer 2 for self-use in the transformer substation is connected to the upper port of the low-voltage side circuit breaker 4. Its main function is to provide a stable power supply for the control circuit and some auxiliary equipment of the transformer substation 1 itself. Transformer 2 for self-use in the transformer substation obtains electrical energy from the upper port of the low-voltage side circuit breaker 4. After transformation, it outputs a voltage level that meets the working requirements of the control circuit and auxiliary equipment, ensuring that these devices can operate normally and providing necessary power support for the stable operation of the entire automatic closing and starting system.

[0025] Control Circuit: The control circuit is located at the output terminal of the transformer 2 (self-use transformer 2) and is used to control the closing of the output terminal of the transformer 2, thereby realizing the automatic closing and starting control of the transformer 1. The control circuit includes an air switch 5, a manual closing switch 6, and a low-voltage side switch closing coil 7. Air switch 5 is located between the low-voltage side switch and the low-voltage side closing button, providing short-circuit and overload protection. When an abnormal increase in current occurs in the control circuit, air switch 5 will automatically trip, cutting off the circuit and preventing damage to other electrical components due to short circuits or overloads, ensuring the safe operation of the control circuit. The manual closing switch 6 is located between air switch 5 and the low-voltage side switch closing coil 7, allowing the operator to... The switch is operated manually to control the closing and starting of the box-type transformer 1 when needed, providing a backup manual control method for the system to deal with special situations such as failure of automatic control. The time-delay closing switch 8 is connected in parallel with the manual closing switch 6. The time-delay closing switch 8 is an electromagnetic time relay or an electronic time relay. Its closing signal is connected in parallel with the manual closing switch 6 of the low-voltage side switch. The function of the time-delay closing switch 8 is to automatically delay the closing signal for a period of time when certain conditions are met, so as to realize the automatic closing and starting of the box-type transformer 1. By setting an appropriate delay time, surge fluctuations can be avoided when the high-voltage side of the box-type transformer is energized, preventing the low-voltage side switch closing coil 7 from being burned out.

[0026] After the 35kV collection line is restored to power, that is, after the voltage on the high-voltage side of the transformer substation is restored, the transformer substation's self-use dry-type transformer will work normally, the transformer substation's self-use AC220V system will work normally, the power supply conditions for the low-voltage side switch closing operation of the transformer substation will be met, there is no need to manually trigger the low-voltage side closing button, the automatic low-voltage side delayed closing switch 8 will automatically close after a 5-second delay, the low-voltage side switch closing coil 7 will be energized, and the automatic closing of the low-voltage side switch will be successfully started.

[0027] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An automatic closing and starting system for a wind turbine generator box-type transformer, characterized in that, include: The box-type transformer (1) is installed on the 35kV collection line. The high-voltage side and the low-voltage side of the box-type transformer (1) are electrically connected to the high-voltage side circuit breaker (3) and the low-voltage side circuit breaker (4), respectively. The input terminal of the transformer for the substation is connected to the upper port of the low-voltage side circuit breaker (4); The control circuit is set at the output terminal of the self-use transformer (2) of the transformer substation, and is used to control the closing of the output terminal of the self-use transformer (2) of the transformer substation.

2. The automatic closing and starting system for wind turbine generator box-type transformers according to claim 1, characterized in that, The control circuit includes an air switch (5), a manual closing switch (6), and a low-voltage side switch closing coil (7). The air switch (5) is located between the low-voltage side switch and the low-voltage side closing button. The manual closing switch (6) is located between the air switch (5) and the low-voltage side switch closing coil (7). The time-delay closing switch (8) is connected in parallel with the manual closing switch (6).

3. The automatic closing and starting system for wind turbine generator box-type transformers according to claim 2, characterized in that, The time-delay closing switch (8) is an electromagnetic time relay or an electronic time relay.

4. The automatic closing and starting system for wind turbine generator box-type transformers according to claim 2, characterized in that, The closing signal of the delayed closing switch (8) is connected in parallel with the manual closing switch (6) of the low-voltage side switch.

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