Energy-saving photovoltaic box substation

Abstract

The invention discloses an energy-saving photovoltaic box-type substation, the technical solution of which mainly comprises a box body, which comprises a high-voltage chamber, a transformer chamber and a low-voltage chamber, wherein the output line of the high-voltage chamber is connected with a high-voltage vacuum contactor for circuit breaking; the high-voltage vacuum contactor is connected with a longitude and latitude time controller for controlling the closing of the high-voltage vacuum contactor during sunshine period; the longitude and latitude time controller is connected with an automatic light-controlled switch for controlling the closing of the high-voltage vacuum contactor under a preset light intensity threshold, so that when power generation cannot be performed at night, the output line of the high-voltage chamber is automatically disconnected, the no-load loss of the transformer is reduced, and the energy-saving effect is achieved.

Description

Technical Field

[0001] The present invention relates to the field of substations, and more specifically, to an energy-saving photovoltaic box-type substation. Background Art

[0002] Photovoltaic power generation has been highly valued worldwide and has been widely used in a very short period of time due to its advantages of being pollution-free, not restricted by geographical location, not requiring fuel consumption, having no mechanical rotating parts, low failure rate, simple maintenance, and short station construction period. At present, photovoltaic power generation can be used as a supplement to conventional energy to meet the electricity needs of special application fields and remote areas without electricity; in the long run, photovoltaic power generation will eventually enter the electricity market as a distributed power source and partially replace conventional energy; it has great significance for environmental protection and energy strategy.

[0003] Distributed photovoltaic power stations are intermittent power sources. When the light intensity meets the minimum starting conditions of the power station, the power station enters the grid-connected power generation operation state; when the light intensity gradually decreases, the power station enters the standby operation state and no longer provides electricity to the grid. The power station changes from a power generation nature to a power load nature.

[0004] For example, photovoltaic panels cannot generate electricity at night or on rainy days, and the entire photovoltaic system is always in operation or standby mode. At this time, there is standby loss, especially the no-load loss of the transformer. Summary of the invention

[0005] The purpose of the present invention is to provide an energy-saving photovoltaic box-type substation, which can automatically disconnect the output line of the high-voltage chamber when it is unable to generate electricity at night, reduce the no-load loss of the transformer, and improve the energy-saving performance.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] An energy-saving photovoltaic box-type substation includes a box body, which includes a high-voltage chamber, a transformer chamber and a low-voltage chamber. The high-voltage output line of the high-voltage chamber is connected to a high-voltage vacuum contactor for controlling the on-off of the high-voltage output line; the high-voltage vacuum contactor is connected to a longitude and latitude time controller for controlling the closing of the high-voltage vacuum contactor during a preset sunshine period and controlling the disconnection of the high-voltage vacuum contactor during a preset night time period.

[0008] By adopting the above technical solution,

[0009] (1) This design uses a high-voltage vacuum contactor as the actuator for high-voltage chamber circuit breaker because:

[0010] High-voltage vacuum contactors use vacuum interrupter chambers to extinguish arcs, and are used to frequently connect and disconnect normal working currents. They are usually used for long-distance connection and disconnection. The operating mechanism of high-voltage vacuum contactors is composed of a holding coil with an iron core and an armature, and has two types: normally open and normally closed. In the normally open type, the coil is energized, attracting the armature and the contactor is closed; when the coil loses power, the contactor is disconnected.

[0011] The high voltage part of traditional photovoltaic power generation box-type substations all uses circuit breakers or load switch combination electrical appliances; this design uses high-voltage vacuum contactors instead of load switch combination electrical appliances because the main circuit switch circuit breaker has an operating life of less than 30,000 times, which is not enough; the operating life of load switch combination electrical appliances is less than 10,000 times, which is far from meeting the requirements of frequent operation. The high-voltage vacuum contactor can perform frequent operations as needed, and its life is up to 1 million times.

[0012] (2) The Jingwei time controller controls the opening and closing of the high-voltage vacuum contactor. When there is sunshine in the area where the substation is located, the Jingwei time controller controls the high-voltage vacuum contactor to close; when the substation is located at night and cannot work, the Jingwei time controller controls the high-voltage vacuum contactor to disconnect, thereby reducing the no-load loss of the transformer by disconnecting the substation.

[0013] The longitude and latitude time controller can provide the longitude and latitude information of the substation and automatically analyze the sunrise and sunset time of the day; by inputting the longitude and latitude information of the location, the longitude and latitude time controller determines the preset value of the sunshine time period and the preset value of the night time period according to the sunshine time period, and presets the opening and closing time of the high-voltage vacuum contactor.

[0014] Obviously, this design uses the Jingwei time controller and the high-voltage vacuum contactor to control the on-off circuit of the high-voltage chamber, which can realize the control of the substation not to generate electricity at night by automatically disconnecting the high-voltage vacuum contactor.

[0015] Preferably, the longitude and latitude time controller is connected to an automatic light-controlled switch for controlling the high-voltage vacuum contactor to close when the light intensity exceeds a preset light intensity threshold, and for controlling the high-voltage vacuum contactor to open when the light intensity is less than the preset light intensity threshold, and when either the longitude and latitude time controller or the automatic light-controlled switch reaches the high-voltage vacuum contactor opening condition, the high-voltage vacuum contactor is disconnected.

[0016] By adopting the above technical solution, the connection of the automatic light-controlled switch is mainly to make up for the fact that the longitude and latitude time controller cannot automatically disconnect the circuit on rainy days. The automatic light-controlled switch can determine whether to disconnect the high-voltage chamber according to the light intensity.

[0017] For example, in rainy weather during the day, photovoltaic power generation stops, and the automatic light-controlled switch can disconnect the high-voltage vacuum contactor.

[0018] The preset light intensity threshold refers to the light sensitivity set by the automatic light control switch. When the light intensity is greater than or equal to the preset light intensity threshold, the light is strong and the high-voltage chamber is open; when the light is less than the preset light intensity threshold, the light is weak and the high-voltage chamber is disconnected.

[0019] Preferably, the automatic light control switch is provided with a photometric adjustment knob for adjusting a preset light intensity threshold.

[0020] By adopting the above technical solution, the light metering adjustment knob can adjust the value of the preset light intensity threshold value to meet the needs of users in different installation occasions.

[0021] Preferably, the automatic light-operated switch is a light-operated delay switch that is activated after a delay of a unit time length.

[0022] By adopting the above technical solution, the light-controlled delay switch is set so that when the passage is illuminated by light, the passage can be executed after a unit time. This design is to avoid the occurrence of short-term sunshine on rainy days. For example, on long rainy days, dark clouds may be blown away by the wind and the sun may appear for several minutes, but after several minutes, it will still be rainy for a long time. By adopting delay control, it can be ensured that the switch is in the off state on rainy days and in environments with short-term light interference. This avoids the loss caused by frequent opening of the substation.

[0023] Preferably, the unit duration is 5 minutes, 10 minutes or 15 minutes.

[0024] By adopting the above technical solution, the unit duration can be set by oneself.

[0025] Preferably, the high-voltage output line of the high-voltage chamber is connected to a circuit breaker, a pull rope is connected to the lever of the circuit breaker, the pull rope sleeve is provided with a vertical straightening cylinder, a swing rod is installed on the upper end of the straightening cylinder and the swing rod is driven by the wind to drive the pull rope to pull down the lever, the lower end of the swing rod is connected to the pull rope, and a wind scoop is installed on the upper end of the swing rod; a damper is provided in the high-voltage chamber to constrain the pull rope from pulling the lever below the set wind speed.

[0026] By adopting the above technical solution, the design is to adapt to strong wind weather, which may cause the photovoltaic class to be damaged and fail to work, and can be disconnected in time to avoid no-load loss and play a role in circuit breaker protection.

[0027] The wind scoop of the swing arm is used to swing above the predetermined wind force, because when the wind force is small, the wind force cannot overcome the resistance of the damper; therefore, only when the external wind force reaches a strong wind level, such as a wind force of level 6 or above, can the wind scoop be blown to swing.

[0028] The purpose of the straightening cylinder is to ensure that the pull rope driven by the swing rod can move in the vertical direction so that the lever of the circuit breaker in the high-voltage room can be pulled.

[0029] The design is that when the wind is strong, the swing rod drives the pull rope to pull the circuit breaker to achieve circuit breaking in the high-voltage chamber.

[0030] The reason is that photovoltaic panels have a long service life, with a basic design life of more than 20 years. Long-term use can easily lead to serious aging of the photovoltaic panel brackets, and the photovoltaic panels are exposed to a large area of ​​wind. Therefore, photovoltaic panels that have been used for many years have the tendency to be damaged by strong winds. For example, Cangnan, Zhejiang, has strong typhoons every year. Another example is that the western region has strong sunlight, but due to the vast and open ground, strong winds often occur.

[0031] In order to prevent strong winds from causing physical damage to the photovoltaic panels and keep the substation in working condition, a wind-sensing circuit breaker mode is adopted. Another advantage of this design is that it adopts a purely mechanical structure, which has strong stability and a long service life.

[0032] Moreover, when the photovoltaic panels are damaged after a windstorm, they cannot generate electricity, and the light-controlled switch and the longitude and latitude time-controlled switch cannot sense it at this time, and no-load loss will still occur. The wind-sensing circuit-breaking method of this design can avoid no-load loss in this situation. In addition, windstorms can also cause physical damage to other electrical appliances. The circuit-breaking method can ensure circuit safety and reduce the occurrence of power accidents.

[0033] Preferably, a rotating ball is fixed to the swing rod, a ball ring is fixed to the housing of the high-pressure chamber, and the rotating ball ring is arranged on the ball ring to realize the rotation and swing of the swing rod.

[0034] By adopting the above technical solution, the cooperation between the ball ring sleeve and the rotating ball is similar to a fisheye joint in structure, and this design is to allow the swing to have a larger swing angle; secondly, the rotating ball can rotate in the ball ring sleeve, so that the swing rod can receive wind from all directions, accurately judge the wind conditions, and then accurately implement the circuit breaker operation.

[0035] Preferably, a reversing wheel is provided in the high-voltage chamber, and the pull rope is sleeved on the reversing wheel.

[0036] By adopting the above technical solution, the pull rope is pulled upward when driven by the swing rod, and the circuit requires that the circuit breaker's lever is pulled down to break the circuit. Therefore, the pull rope pulls the circuit breaker downward; the purpose of the reversing wheel is to adjust the pulling direction of the pull rope.

[0037] Preferably, the damper includes a spring sleeved on the pull rope and a pressure plate fixed on the pull rope, the lower end of the spring is fixed to the upper surface of the pressure plate, the upper end of the spring abuts against the bottom of the straightening cylinder, and the pressure plate is located below the straightening cylinder.

[0038] By adopting the above technical solution, the pull rope fixes the pressure plate, so when the pull rope is pulled up, the pressure plate also moves up, and the spring on the pressure plate will be squeezed at this time. When the wind force is difficult to overcome the elastic force of the spring, the pull rope will not be pulled;

[0039] When the wind force drives the spring to compress to a predetermined position, the wind force reaches a predetermined position of the circuit breaker.

[0040] The advantage of this design is that it utilizes the elastic force of the spring. When it is necessary to perform circuit breaking operations under different wind forces, it is only necessary to adjust the elastic coefficient of the spring.

[0041] Preferably, the swing angle range of the swing arm is 0-330 degrees.

[0042] By adopting the above technical solution, the design is to enable the swing rod to have a larger swing angle, so that the pull rope can be pulled farther to facilitate the circuit breaker to trip.

[0043] In summary, the present invention has the following beneficial effects:

[0044] The light control unit and the longitude and latitude time control unit are connected to exchange information. The light control unit and the longitude and latitude time control unit control the action of the high-voltage vacuum contactor, and finally achieve the purpose of controlling the circuit breaker in the high-voltage chamber. The longitude and latitude time control unit can provide the longitude and latitude information of the substation location, and automatically analyze the sunrise and sunset time of the day; the light control unit can control the action of the substation distribution equipment and is equipped with a photoresistor to detect the light intensity information of the substation; the light control unit uses the light intensity information detected by the photoresistor to determine whether the circuit breaker requirement is met. If it is met, the light is turned off, and if it is not met, the detection continues.

[0045] On the basis of the existing operation mode of photovoltaic power station, we break the tradition and actively innovate. The high-voltage end adopts vacuum contactor-combination electrical appliances, and the secondary circuit adopts Jingweidu time controller and automatic light-controlled switch control, which minimizes the standby loss of electrical appliances, especially the no-load loss of transformers, thereby greatly reducing the energy consumption during the operation of photovoltaic box-type substations.

[0046] Furthermore, photovoltaic panels are unable to absorb moonlight for energy conversion. On full moon days in western regions, the moonlight has a certain intensity. At this time, the photoresistor will misjudge the moonlight and give an output line path signal. This is a defect of using photoresistors alone to control the output line by light sensing. The synchronous control of the longitude and latitude time controller and the light-controlled switch of this design effectively avoids the defect of the above-mentioned single-degree light-controlled switch control; because the longitude and latitude time controller has a circuit-breaking signal during the night time period, the output line must be disconnected at night. Therefore, the synchronous control of the longitude and latitude time controller and the light-controlled switch can avoid the no-load loss in the strong light of the moonlit night. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic diagram of a photovoltaic power generation system in an embodiment;

[0048] Figure 21. is a control relationship diagram of the high-voltage vacuum contactor by the latitude and longitude time controller and the automatic light-controlled switch in the embodiment;

[0049] Figure 3 Schematic diagram of the principle of the automatic light-controlled switch in the embodiment;

[0050] Figure 4 Schematic diagram of the pull rope state when the circuit breaker is closed in the embodiment;

[0051] Figure 5 Schematic diagram of the pull rope state when the circuit breaker is disconnected in the embodiment.

[0052] In the figure:

[0053] 1. Box; 11. High-voltage room; 12. Transformer room; 13. Low-voltage room;

[0054] 2. High voltage vacuum contactor;

[0055] 3. Longitude and latitude time controller;

[0056] 4. Automatic light control switch; 41. Light metering adjustment knob;

[0057] 5. Circuit breaker; 51. Lever;

[0058] 61. Pull rope; 62. Straightening cylinder; 63. Reversing wheel;

[0059] 7. damper; 71. spring; 72. pressure plate;

[0060] 81. Swinging rod; 82. Wind scoop; 83. Rotating ball; 84. Ball ring. Implementation

[0061] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0062] Embodiment, an energy-saving photovoltaic box-type substation, such as Figure 1 As shown, photovoltaic panels receive sunlight, convert light energy into electrical energy, and then convert direct current into alternating current through an inverter, which is then connected to the grid after being stepped up through a substation.

[0063] The substation comprises a box body 1, which comprises a high-voltage chamber 11, a transformer chamber 12 and a low-voltage chamber 13. A control power supply is arranged in the high-voltage chamber 11.

[0064] The high-voltage output line of the high-voltage chamber 11 is connected to the circuit breaker 5 and the high-voltage vacuum contactor 2 ; both the circuit breaker 5 and the high-voltage vacuum contactor 2 can perform a circuit-breaking operation on the high-voltage chamber 11 .

[0065] In this embodiment, the high-voltage vacuum contactor 2 adopts a ZFCC5 type contactor-combination electrical appliance, which can meet various operations of the power grid under normal or accident conditions, including closing and breaking short-circuit currents, as well as frequent operations as needed, with a service life of 1 million times.

[0066] Reference Figure 2 and Figure 3 The high-voltage vacuum contactor 2 is connected to a longitude and latitude time controller 3 for controlling the closing of the high-voltage vacuum contactor 2 during the sunshine period. The longitude and latitude time controller 3 in this embodiment uses the CF-210 longitude and latitude time controller;

[0067] CF-210 Jingwei Time Controller is an intelligent time control device that can automatically change the time according to the local day and night length changes, developed based on the laws of the earth's rotation and revolution around the sun, combined with the sunrise and sunset time data from all over the country provided by the Nanjing National Purple Mountain Observatory. It is developed and produced using modern microcomputer software technology and imported high-quality components with high reliability, stable performance and reliable quality. It has strong lightning protection, surge resistance and anti-interference capabilities. It has a ten-year power-off memory function, precise control time, small size, easy installation and simple operation. The use of CF-210 Jingwei Time Controller can accurately ensure that the high-voltage vacuum contactor 2 is connected during the day and disconnected at night, or connected or disconnected within the set time period.

[0068] By inputting the latitude and longitude information of the location, the longitude and latitude time controller 3 can automatically analyze the sunrise and sunset time of the day according to the longitude and latitude information of the substation; the longitude and latitude time controller 3 controls the opening and closing time of the high-voltage vacuum contactor 2 according to the sunshine time point, and realizes the preset sunshine time period and the preset night time period. For example, the sunshine time is from 8 am to 5 pm. In the sunshine time period from 8 am to 5 pm, the longitude and latitude time controller 3 controls the high-voltage vacuum contactor 2 to send a closing signal; in the night time period from 5 pm to 8 am the next day, the longitude and latitude time controller 3 controls the high-voltage vacuum contactor 2 to send a disconnection signal.

[0069] Reference Figure 2 and Figure 3 ,

[0070] The longitude and latitude time controller 3 is connected to an automatic light-controlled switch 4 for controlling the high-voltage vacuum contactor 2 to close when the light intensity exceeds a preset light intensity threshold, and controlling the high-voltage vacuum contactor 2 to open when the light intensity is less than the preset light intensity threshold;

[0071] The automatic light control switch 4 can set a light intensity threshold, and the actual external light intensity is compared with the light intensity threshold;

[0072] When either the longitude and latitude time controller 3 or the automatic light-controlled switch 4 reaches the disconnection condition of the high-voltage vacuum contactor 2, the high-voltage vacuum contactor 2 is disconnected.

[0073] The automatic light-controlled switch 4 is a light-controlled delay switch that is activated by delaying a unit time length. In this embodiment, the unit time length is 10 minutes. The automatic light-controlled switch 4 includes a light-controlled unit and a delay unit.

[0074] When there is no light, the automatic light-controlled switch 4 sends a disconnect signal to the high-voltage vacuum contactor 2.

[0075] When illumination starts, the automatic light-controlled switch 4 sends a disconnection signal of 10 minutes to the high-voltage vacuum contactor 2;

[0076] If the illumination lasts for less than 10 minutes, the automatic light-operated switch 4 returns to the no-illumination disconnection state for the high-voltage vacuum contactor 2.

[0077] If the illumination lasts longer than 10 minutes, the automatic light-operated switch 4 sends a signal to close the circuit to the high-voltage vacuum contactor 2 after 10 minutes.

[0078] In this embodiment, the automatic light-controlled switch 4 adopts the CFGK-10 automatic light-controlled switch, which is a new type of automatic light control switch. The controller input terminal is connected to the control power supply. When the external light is dark to a certain degree, the output is in the off state. When the light is strong to a certain degree, the output is in the on state, and automatic control can be achieved. A delay circuit is provided inside the controller to ensure that it is in the off state on rainy days and in an environment with short-term light interference. A photometric adjustment knob 41 is provided on the controller panel to meet the needs of users in different installation occasions; the CFGK-10 automatic light-controlled switch is small in size, beautiful in appearance, reliable in operation, easy to install, low in power consumption, large in control power, and has a rainproof design. The use of the CFGK-10 automatic light-controlled switch can not only ensure that the ZF high-voltage vacuum contactor 2 is disconnected at night, but also ensure that it is disconnected in rainy weather during the day.

[0079] Reference Figure 3 The working principles of the light control unit and the delay unit in the automatic light control switch 4 are as follows.

[0080] (1.0) There is no light, the resistance of the photoresistor RG is large, the transistor 9013-1 is turned on, the capacitor C1 is charged, and the current is added to the base of the transistor 9013-2 through R1. At this time, the transistor 9013-2 is turned on, the relay K1 is energized and in the attracted state, the normally closed contact of the relay K1 is opened, the high-voltage vacuum contactor 2 is de-energized, and the high-voltage vacuum contactor 2 is normally open. Therefore, at this time, the high-voltage output line of the high-voltage chamber 11 is in an open circuit state.

[0081] (2.1) When the light starts to shine, the resistance of the photoresistor RG is small, and the transistor 9013-1 is cut off, but the charge stored in the capacitor C1 continues to be added to the base of the transistor 9013-2 through R1, and the relay K1 continues to be energized and in the energized state, the normally closed contact of the relay K1 opens, and the high-voltage vacuum contactor 2 continues to be de-energized;

[0082] This design achieves the purpose of delaying the continuous disconnection of the output of the high-voltage chamber 11 at the initial stage of illumination;

[0083] If there is no light during the unit time when the capacitor C1 releases the charge, the circuit returns to the no-light open circuit state (1.0) mentioned above.

[0084] (2.2) Continuous illumination until the charge stored in capacitor C1 is released in a unit time, that is, after 10 minutes, the resistance of photoresistor RG is small, transistor 9013-2 is turned off, relay K1 is powered off and in a separated state, the contact point of relay K1 is in a normally closed conducting state, and high-voltage vacuum contactor 2 is powered on; after power is turned on, the contact points of high-voltage vacuum contactor 2 are magnetically attracted and closed, thereby realizing the passage of the output line of high-voltage chamber 11;

[0085] The automatic light control switch 4 is provided with a photometric adjustment knob 41 for adjusting the light intensity threshold. The photometric adjustment knob 41 controls the resistance value of the sliding rheostat RP to adjust the light intensity threshold.

[0086] In this design, only when the automatic light-controlled switch 4 and the longitude and latitude time controller 3 meet the passage conditions at the same time, the contact points of the high-voltage vacuum contactor 2 are magnetically attracted to close, thereby realizing the passage of the output line of the high-voltage chamber 11; when any one of the sensing conditions of the automatic light-controlled switch 4 and the longitude and latitude time controller 3 requires the high-voltage chamber 11 to be disconnected, the high-voltage vacuum contactor 2 is disconnected due to lack of power.

[0087] Reference Figure 1 , the output line of the high voltage chamber 11 is connected to the circuit breaker 5, refer to Figure 4 A pull rope 61 is connected to the lever 51 of the circuit breaker 5 , and a ring is fixed to the pull rope 61 , and the ring is sleeved on the lever 51 .

[0088] A reversing wheel 63 is installed on the inner bottom of the high-pressure chamber 11 , and the pull rope 61 is sleeved on the reversing wheel 63 , so that both ends of the pull rope 61 are arranged vertically upward.

[0089] The pull rope 61 on the right side is sleeved with a vertical straightening tube 62, which is a plastic tube and can be fixed in the high-pressure chamber 11 by screws. Figure 4 The straightening tube 62 in the figure is in a longitudinal section view, and the pull rope 61 passes through the straightening tube 62 from bottom to top. The upper end of the straightening tube 62 is provided with a chamfer, which reduces the wear of the pull rope 61 when it is pulled along the upper end of the straightening tube 62, thereby extending the service life of the pull rope 61;

[0090] A swing rod 81 is fixed to the upper end of the right pull rope 61 , and the pull rope 61 is fixed to the lower end of the swing rod 81 .

[0091] A rotating ball 83 is fixed to the swing rod 81, and the swing rod 81 is arranged through the center of the rotating ball 83. A ball ring sleeve 84 is fixed to the shell of the high-pressure chamber 11. The inner surface of the ball ring sleeve 84 is a spherical surface. The upper and lower sleeve openings of the ball ring sleeve 84 are for the swing rod 81 to pass through. The sleeve opening diameters of the upper and lower sleeve openings of the ball ring sleeve 84 are both smaller than the diameter of the rotating ball 83.

[0092] Therefore, the rotating ball 83 and the ball ring sleeve 84 are clearance-matched, the rotating ball 83 can rotate in the ball ring sleeve 84, and the rotating ball 83 cannot be separated from the ball ring sleeve 84. The rotating ball 83 is sleeved in the ball ring sleeve 84 to realize the rotation and swing of the swing rod 81. When the wind blows to the swing rod 81 from multiple angles on the horizontal plane, the swing rod 81 can swing under the corresponding wind force. The swing rod 81 is located at the upper end of the straightening cylinder 62.

[0093] A wind scoop 82 is installed at the upper end of the swing rod 81 , and the wind scoop 82 is used to increase the wind receiving area of ​​the swing rod 81 .

[0094] A damper 7 is provided in the high-pressure chamber 11 to constrain the pull rope 61 from pulling the lever 51 below a set wind speed. The function of the damper 7 is to limit the wind force level at which the swing arm 81 swings. When the wind force blowing the swing arm 81 is sufficient to overcome the resistance of the damper 7, the swing arm 81 swings, and the swing arm 81 drives the pull rope 61 to be pulled obliquely upward.

[0095] The structure of the damper 7 includes a spring 71 sleeved on the pull rope 61 and a pressure plate 72 fixed on the pull rope 61, the pressure plate 72 is located below the straightening cylinder 62, the lower end of the spring 71 is fixed to the upper surface of the pressure plate 72, and the upper end of the spring 71 is in contact with the bottom of the straightening cylinder 62; in this embodiment, the swing angle range of the swing rod 81 is 300 degrees.

[0096] Reference Figure 5 The swing rod 81 pulls the pull rope 61 to disconnect the circuit breaker 5. The wind scoop 82 swings after being subjected to a wind force of a predetermined intensity. The lower end of the swing rod 81 rotates upward along the center of the rotating ball 83. At the same time, the pull rope 61 is pulled obliquely upward. After the reversing wheel 63 reverses the pull rope 61, the pull rope 61 on the left side pulls down the lever 51 of the circuit breaker 5 to disconnect the circuit, thereby achieving the purpose of disconnecting the high-voltage chamber 11.

[0097] When the photovoltaic panel is damaged, the photovoltaic panel cannot generate electricity, and the light-controlled switch and the longitude and latitude time-controlled switch cannot sense it at this time, and no-load loss will still occur. The wind-sensing circuit-breaking method of this design can avoid no-load loss in this situation. In this embodiment, the resistance generated by the spring 71 corresponds to a strong wind of level 7. In other embodiments, the resistance generated by the spring 71 corresponds to a strong wind of level 8, 9, 10, 11 or 12.

[0098] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An energy-saving photovoltaic box-type substation, comprising a box body (1), wherein the box body (1) comprises a high-voltage chamber (11), a transformer chamber (12) and a low-voltage chamber (13), Its characteristics are: The high-voltage output line of the high-voltage chamber (11) is connected to a high-voltage vacuum contactor (2) for controlling the on-off of the high-voltage output line; The high-voltage vacuum contactor (2) is connected to a longitude and latitude time controller (3) for controlling the high-voltage vacuum contactor (2) to close during a preset sunshine period and to open during a preset night time period; The high-voltage output line of the high-voltage chamber (11) is connected to a circuit breaker (5), a pull rope (61) is connected to a lever (51) of the circuit breaker (5), a vertical straightening cylinder (62) is sleeved on the pull rope (61), a swing rod (81) is installed at the upper end of the straightening cylinder (62) and is driven by wind to drive the pull rope (61) to pull the pull rod (51) downward, the lower end of the swing rod (81) is connected to the pull rope (61), and a wind scoop (82) is installed at the upper end of the swing rod (81); A damper (7) is provided in the high pressure chamber (11) for restraining the pull rope (61) from pulling the lever (51) when the wind speed is below a set value. The swing rod (81) is fixed with a rotating ball (83), the housing of the high pressure chamber (11) is fixed with a ball ring sleeve (84), and the rotating ball (83) is sleeved on the ball ring sleeve (84) to realize the rotation and swing of the swing rod (81); A reversing wheel (63) is provided in the high-pressure chamber (11), and the pull rope (61) is sleeved on the reversing wheel (63); The damper (7) comprises a spring (71) sleeved on the pull rope (61) and a pressure plate (72) fixed on the pull rope (61), the lower end of the spring (71) is fixed to the upper surface of the pressure plate (72), the upper end of the spring (71) abuts against the bottom of the straightening cylinder (62), and the pressure plate (72) is located below the straightening cylinder (62); The swing angle range of the swing rod (81) is 0-330 degrees.

2. The energy-saving photovoltaic box-type substation according to claim 1, Its characteristics are: The longitude and latitude time controller (3) is connected to an automatic light-controlled switch (4) for controlling the high-voltage vacuum contactor (2) to close when the light intensity exceeds a preset light intensity threshold, and controlling the high-voltage vacuum contactor (2) to open when the light intensity is less than the preset light intensity threshold, and when either the longitude and latitude time controller (3) or the automatic light-controlled switch (4) reaches a condition for opening the high-voltage vacuum contactor (2), the high-voltage vacuum contactor (2) is disconnected.

3. The energy-saving photovoltaic box-type substation according to claim 2, Its characteristics are: The automatic light control switch (4) is provided with a photometric adjustment knob (41) for adjusting a preset light intensity threshold.

4. The energy-saving photovoltaic box-type substation according to claim 3, Its characteristics are: The automatic light-operated switch (4) is a light-operated delay switch that is activated by delaying a unit time length.

5. The energy-saving photovoltaic box-type substation according to claim 4, Its characteristics are: The unit duration is 5 minutes, 10 minutes or 15 minutes.

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