CN203850094U - Main transformer oil flow guide micro circulation device with photovoltaic frequency conversion function - Google Patents

Abstract

The utility model relates to a main transformer oil flow guiding microcirculation device with photovoltaic frequency conversion function, which comprises a main transformer body and radiators arranged on both sides of the main transformer body. The flow is directed to the spray pipe. There are oil outlet valves on both sides of the upper part of the main transformer body. The oil outlet valves are respectively connected to the inlets of the radiators on both sides through the pipeline. The microcirculation pump drives the oil circuit circulation, and the oil flow guide nozzle is evenly provided with oil outlet holes on the side facing the winding and the iron core. The frequency conversion microcirculation pump is electrically connected to the power controller, and the power controller is connected to the energy storage device. The energy storage is connected with the solar receiver through the photoelectric converter. The utility model overcomes the shortcomings of the existing main transformer oil flow circulation mode. The photoelectric conversion system receives solar energy, and performs photovoltaic conversion and power control to provide sufficient and qualified electric energy to supply the oil flow to guide the microcirculation system to work, and is controlled by the frequency conversion oil pump. The small holes are sprayed out slowly to centrally cool the main transformer winding and iron core to enhance the cooling effect and effectively improve the cooling efficiency and safety performance.

Description

Main transformer oil flow guide microcirculation device with photovoltaic frequency conversion function

technical field

The utility model relates to a main transformer oil flow guiding microcirculation device with photovoltaic frequency conversion function.

Background technique

During the operation of the main transformer, due to the action of electricity and magnetism, its winding and iron core will generate heat. If the heat cannot be taken away in time, it will cause serious accidents such as burning or even explosion of the main transformer. The transformer oil circulates to cool the winding and iron core, and the heat taken away by the transformer oil is exchanged through the cooling device, and the cooled cold oil flows into the main transformer body for cooling. The traditional main transformer oil flow circulation method is divided into two types: the cold and hot natural convection method relying on the oil flow temperature difference and the forced oil circulation method of the submersible oil pump. The cold and hot natural convection method of oil flow temperature difference has poor effect, so that under the same conditions, the main transformer has many disadvantages such as high copper and iron losses, poor operating conditions, large equipment manufacturing volume, and large oil consumption. Although the strong oil circulation method of the submersible pump of the main transformer makes the cooling effect of the oil circulation flow good, but because of its high speed and non-adjustability, the oil flow pressure is high, the flow velocity and the flow rate are large, and the oil flow circulation is prone to turbulence and air bubbles. The high voltage and high magnetic field environment in the main transformer will lead to bubble bridging discharge failure, or even serious accidents such as burning the main transformer, and turbulent flow will also have adverse effects on the inside of the main transformer, for example, turbulent flow will roll up small impurities at the bottom of the main transformer, The turbulence will impact the windings and the main transformer internal lead connectors, etc., which may cause failures or even serious accidents. Moreover, since the speed of the main transformer submersible pump is not adjustable, it can only be controlled by emergency stop and emergency start of several groups of submersible pumps. To deal with the oil circulation cooling requirements of different loads and oil temperature sections of the main transformer, resulting in many defects such as easy wear, high energy consumption, high noise, heavy equipment maintenance workload, and short service life of the submersible pump. In the actual operation of the main transformer, except for the short-term heavy load and high oil temperature state, most of the operation period does not require high-speed and large-flow oil flow, and only the slow flow of oil flow can satisfy the main transformer winding. Iron core circulation cooling needs, in addition, the existing cooling device of the main transformer consumes a lot of power, and the energy waste is serious.

Contents of the invention

In order to overcome the high speed and non-adjustable high speed and non-adjustable oil circulation mode of the existing main transformer oil pump, resulting in high oil flow pressure, large flow rate, and large flow rate, oil flow circulation is prone to turbulence and air bubbles, resulting in bubble bridging discharge failures in high magnetic field environments. Even the defects of serious accidents that burn down the main transformer, the first specific embodiment of the utility model is: a main transformer oil flow guiding microcirculation device with photovoltaic frequency conversion function, including a main transformer body and two sides of the main transformer body Radiator, the main transformer body is provided with windings and iron cores, oil flow guiding nozzles are provided under the windings and iron cores in the main transformer body, and oil outlet valves are provided on both side walls of the upper part of the main transformer body , the oil outlet valve is respectively connected with the inlets of the radiators on both sides through the pipeline, the outlet of the radiator is connected with the oil flow guide nozzle through the oil return pipeline, and the oil return pipeline is provided with an oil inlet valve and a frequency conversion Micro-circulation pump, the variable-frequency micro-circulation pump drives oil circuit circulation, the oil flow guide nozzle is evenly provided with oil outlet holes on the side facing the winding and the iron core, the end of the oil flow guide nozzle is closed, and the frequency conversion micro-circulation pump The circulating pump is electrically connected with the power controller, and the power controller is connected with the energy storage, and the energy storage is connected with the solar receiver through the photoelectric converter.

Further, the solar receiver includes a plurality of reversible solar panels, the lower end of each solar panel is sleeved on the rotating shaft and connected to an energy storage, and a comparator is provided in the energy storage. The comparator controls the rotation of the rotating shaft according to the amount of energy collected by each solar panel to achieve the maximum energy collection of each solar panel. The photoelectric conversion system receives solar energy and performs photovoltaic conversion and power control to provide sufficient and qualified electrical energy for oil supply. road cycle work.

Further, the oil flow guide nozzle is U-shaped or ring-shaped and arranged around the winding and the iron core.

Further, the main transformer body is provided with an online oil temperature detector, and a control box is provided beside the main transformer body, and a control module is provided in the control box, and the online oil temperature detector and the control module are electrically connected. sexual connection.

Further, the control module is electrically connected with the variable frequency microcirculation pump.

Compared with the prior art, the utility model has the following beneficial effects: the patented technology overcomes the shortcomings of the existing main transformer oil flow circulation mode, controls the small hole to spray out slowly through the frequency conversion oil pump, and conducts the main transformer winding and iron core Concentrated cooling to enhance the cooling effect, while avoiding the generation of turbulence and air bubbles, effectively improving the cooling efficiency and safety performance, it is a revolutionary innovation in the main transformer oil flow circulation method. At the same time, the utility model adopts the photoelectric conversion system to receive solar energy, and performs photovoltaic conversion and power control to provide sufficient and qualified electric energy to supply the oil flow to guide the microcirculation system to work. The external backup power supply is automatically switched when there is insufficient light at night and in long-term rainy days It greatly saves the energy consumption of the cooling work of the main transformer.

Description of drawings

Fig. 1 is a schematic diagram of the principle of the photovoltaic conversion system of the embodiment of the present invention (the power switch of K1 is in the normally open state, the power switch of K2 is in the normally closed state, and K1 and K2 are mutually locked).

Fig. 2 is a schematic diagram of the main transformer winding and iron core immersed in transformer oil for cooling according to the embodiment of the utility model.

Fig. 3 is a schematic diagram of the utility model embodiment installed in the winding of the main transformer, the oil flow guide nozzle at the bottom of the iron core for soothing oil injection and centralized cooling, and the microcirculation flow of the oil flow in the main transformer.

Fig. 4 is a cross-sectional plan view of the embodiment of the utility model installed on the main transformer winding and the oil flow guiding nozzles on both sides of the bottom of the iron core.

Fig. 5 is a schematic diagram of the working principle of the oil flow guiding microcirculation of the main transformer according to the embodiment of the utility model.

Fig. 6 is a schematic block diagram of the working principle of the control module of the embodiment of the present invention.

Fig. 7 is a schematic diagram of the working structure of the solar receiver according to the embodiment of the utility model.

In the figure: 1-oil outlet valve; 2-radiator inlet; 3-radiator; 4-radiator outlet; 5-inlet valve of frequency conversion microcirculation pump; 6-frequency conversion microcirculation pump; 7-oil inlet valve; 8- Online oil temperature detector; 9-oil flow guide nozzle, 10-main transformer body, 11-solar panel, 12-motor, 13-energy storage.

Detailed ways

The utility model is described in further detail below.

As shown in Figures 1 to 5, a main transformer oil flow guide microcirculation device with photovoltaic frequency conversion function includes a frequency conversion microcirculation pump 6, a winding installed in the main transformer body 10, and oil flow guides on both sides of the bottom of the iron core. Nozzle 9, oil outlet valve 1 on the upper part of the main transformer body, oil inlet valve 7 on the lower part of the main transformer body, transformer oil, oil flow connecting pipe outside the main transformer body, radiator 3, and online oil temperature detector 8 and control modules and photoelectric conversion systems.

The electric energy required for the work of the oil-flow-guiding microcirculation system is provided by the photoelectric conversion system, and the control module automatically controls the oil-flow-guiding microcirculation system according to the pre-designed and programmed program. The photoelectric conversion system includes a solar receiver, a photoelectric converter, an energy storage device, a power supply controller, and an external backup power supply, etc. The power supply controller in the photoelectric conversion system is connected to the energy storage device, and the energy storage device It is connected with the solar receiver through the photoelectric converter, and the solar receiver includes a plurality of reversible solar panels 11, and the lower end of each solar panel 11 is sleeved on the rotating shaft and connected with the energy storage 13, and the rotating shaft Driven by the motor 12, the energy storage 13 is provided with a comparator, and the comparator controls the rotation of the shaft according to the amount of energy collected by each solar panel to achieve the maximum amount of energy collected by each solar panel. The power controller and The energy storage, the oil flow-guiding microcirculation system and the external backup power supply are connected. The photoelectric conversion system receives solar energy and performs photovoltaic conversion and power control to provide sufficient and qualified electric energy for the oil flow-guiding microcirculation system to work. At night or in long-term rainy days, when the photovoltaic conversion energy is insufficient and the oil temperature of the main transformer is very high, the external backup power supply is automatically turned on. Due to rainy days and nights, the ambient temperature around the main transformer is lowered, which can effectively cool the main transformer, so the possibility of using an external backup power supply is rare. The photoelectric conversion system is electrically connected to the oil flow guiding microcirculation system.

The oil flow guiding microcirculation device of the main transformer includes a variable frequency microcirculation pump 6, which pumps the cold oil flow into the main transformer body. The oil outlet valve 1 on the upper part of the main transformer flows into the radiator 3. After the oil flow is cooled in the radiator 3, it is pumped into the main transformer by the frequency conversion microcirculation pump 6 for cooling, and the cycle is repeated. The variable frequency microcirculation pump 6 is electrically connected to the control module.

The oil flow guide microcirculation device of the main transformer mainly includes the oil flow guide nozzle 9 arranged in the main transformer body. One end of the flow guide nozzle 9 is closed, and the other end is connected to the main transformer oil inlet valve 7 through an insulating connecting pipe. Some small oil outlet holes are evenly drilled on the side of the oil flow guide nozzle 9 close to the main transformer winding and iron core to cool the oil. The oil flow is slowly sprayed out through these small holes, and the winding and iron core of the main transformer are guided and concentrated for cooling to enhance the cooling effect. The oil flow heated by the winding and iron core rises and spreads, and passes through the oil outlet valve 1 on the upper part of the main transformer. Flow out to the radiator 3 outside the main transformer body to be cooled, and the cooled oil flow enters the oil flow guide nozzle 9 in the main transformer through the frequency conversion microcirculation pump 6 to cool the winding and iron core, and the entire oil flow The system forms an oil flow guiding microcirculation.

The control module includes an online oil temperature detector 8 installed on the upper part of the main transformer body 10, which can detect the oil temperature in the main transformer in real time and transmit the online oil temperature data to the control module. The online oil temperature detector 8 is electrically connected to the control module.

The control module can automatically control the output of the variable frequency microcirculation pump 6 according to the oil temperature value transmitted by the oil temperature online thermometer in real time according to the previously designed and programmed program. When the oil temperature rises, the control module controls the output of the variable frequency microcirculation pump 6 The output increases the oil flow rate and circulation, and vice versa. Due to the high electric field environment inside the main transformer, too fast oil flow will generate turbulent flow and air bubbles in the main transformer, which may lead to faults of air bubble bridging discharge, or even serious accidents such as burning the main transformer. There is a limit on the highest oil flow velocity value to ensure that the oil flow always operates in a gentle and low-speed microcirculation mode. The control module is electrically connected to the frequency conversion microcirculation pump 6 and the oil temperature online temperature detector 8. The control module can be PLC, or other microprocessors.

The above method of using the main transformer oil flow guiding microcirculation device mainly uses the variable frequency microcirculation pump 6 and the oil flow guiding nozzle 9 to guide the cold transformer oil in a soothing manner to concentrate and guide the oil injection to cool the main transformer winding and iron core due to the electric and The heat generated by the magnetic action, the heated oil flow rises and diffuses in the main transformer, flows out of the main transformer to the radiator 3 installed outside the main transformer body for cooling, and the cooled oil flow passes through the frequency conversion microcirculation pump 6 And the oil flow guide nozzle 9 returns to the main transformer to cool the winding and iron core, so that the cycle is repeated continuously. The specific usage steps are as follows: 1) Turn on the solar receiver and open the upper oil outlet valve 1 of the main transformer and the oil inlet at the lower part Valve 7; 2) Open the inlet valve of the variable frequency microcirculation pump 6; 3) Turn on the variable frequency microcirculation pump 6, at this time the oil flow begins to circulate, and the oil flow guide nozzle 9 installed in the main transformer begins to slowly flow to the main transformer winding 4) Open the control module, the control module can automatically control the output of the variable frequency microcirculation pump 6 according to the oil temperature value transmitted by the oil temperature online temperature detector 8 in real time, when the oil temperature rises At this time, the control module controls the frequency conversion micro-circulation pump 6 to increase the oil flow rate and circulation volume, and vice versa. Since the control module also sets a maximum oil flow rate value for the frequency conversion micro-circulation pump 6, it is guaranteed that the oil flow is always guided at a gentle and low speed. 5) The oil flow guiding nozzle 9 installed on both sides of the main transformer winding and the bottom of the iron core will continuously and slowly spray the cold oil flow to the main transformer winding and iron core, ensuring that the main transformer winding And the cooling effect of the iron core, because the control module automatically controls the frequency conversion microcirculation pump 6 to always operate in a moderate and low-speed microcirculation mode, which will not cause turbulence and air bubbles, which effectively guarantees the safe operation of the main transformer.

The above descriptions are only preferred embodiments of the present utility model, and all equivalent changes and modifications made according to the patent scope of the present utility model shall fall within the scope of the present utility model.

Claims (5)

1. A main transformer oil flow guiding microcirculation device with photovoltaic frequency conversion function, characterized in that: it includes a main transformer body and radiators arranged on both sides of the main transformer body, and windings and iron coils are arranged in the main transformer body. Core, the inner winding of the main transformer body and the lower part of the iron core are provided with oil flow guide nozzles, and the upper side walls of the main transformer body are provided with oil outlet valves, and the oil outlet valves are respectively connected to the heat sinks on both sides through the pipeline. The inlet of the radiator is connected, the outlet of the radiator is connected with the oil flow guide nozzle through the oil return pipeline, the oil inlet valve and the frequency conversion microcirculation pump are arranged on the oil return pipeline, and the frequency conversion microcirculation pump drives the oil circuit to circulate , the side of the oil flow guide nozzle facing the winding and the iron core is evenly provided with oil outlet holes, the end of the oil flow guide nozzle is closed, the frequency conversion microcirculation pump is electrically connected to the power controller, and the power control The energy storage device is connected with the energy storage device, and the energy storage device is connected with the solar receiver through the photoelectric converter. 2. A main variable oil flow guiding microcirculation device with photovoltaic frequency conversion function according to claim 1, said solar receiver includes a plurality of reversible solar panels, and the lower end of each solar panel is sleeved on The rotating shaft is connected with the energy storage device, and a comparator is arranged in the energy storage device, and the comparator controls the rotation of the rotating shaft according to the amount of energy collected by each solar cell panel to achieve the maximum energy collection of each solar cell panel. The photoelectric conversion system receives solar energy and performs photovoltaic conversion and power control to provide sufficient and qualified electric energy for the oil circuit to circulate. 3. A main transformer oil flow guide microcirculation device with photovoltaic frequency conversion function according to claim 1, the oil flow guide nozzle is U-shaped or ring-shaped and arranged around the winding and the iron core. 4. A main transformer oil flow guiding microcirculation device with photovoltaic frequency conversion function according to claim 1, the main transformer body is provided with an oil temperature online temperature detector, and a control box is provided next to the main transformer body, A control module is arranged in the control box, and the online oil temperature detector is electrically connected with the control module. 5 . The main inverter oil flow guide microcirculation device with photovoltaic frequency conversion function according to claim 3 , the control module is electrically connected with the frequency conversion microcirculation pump.