CN201910992U - Rectifying cabinet air channel of excitation system of pumped storage unit - Google Patents

Abstract

The air duct of the pumped storage unit excitation system rectifier cabinet, including the louver air inlet located at the lower front and rear doors of the cabinet, the confluence box, the front panel, the rear panel, the left and right sides of the rectifier cabinet and the air outlet on the top of the cabinet, the overall vertical state, and Including vertically installed cooling fins, cold air is blown to the air duct along the air inlet through the air inlet, and air flow is formed in the air duct to take away the heat from the surface of the radiator, and the hot air is discharged from the air outlet. The utility model has the beneficial effects of being insulated from the internal rectifying circuit, transparent and weather-resistant, reliable in installation, elegant in appearance, and convenient for observation and maintenance.

Description

Pumped storage unit excitation system rectifier cabinet air duct

technical field

The utility model relates to an air duct suitable for a rectifier cabinet of an excitation system of a pumped energy storage unit, which can provide a good heat dissipation environment for a rectifier in the rectifier cabinet, and belongs to the technical field of structural design of electric cabinets.

Background technique

The pumped storage unit can not only be used as a generator to generate electricity during the peak load, but also can be used as a motor to pump water storage during the low load. It has the characteristics of sensitive response and rapid load tracking. Compared with conventional power sources, pumped storage power plants can adapt to rapid changes in load, and play an important role in improving the safe and stable operation of the power system, the quality and reliability of power grid power supply, and at the same time can optimize the power structure, realize green environmental protection, and achieve power The overall energy saving and consumption reduction of the system improves the overall economic benefits. With the large-scale construction of clean energy such as nuclear power, wind power and photovoltaics, it has become an industry consensus that a certain proportion of peak-shaving power sources must be built, and pumped storage power generation is one of the best choices.

The pumped storage unit needs to be equipped with an excitation system, which converts the three-phase alternating current into direct current through the rectifier device to provide the excitation current for the generator rotor, forms a rotating magnetic field when the rotor rotates, and controls the excitation current through the excitation regulator to control the operation of the generator in different states. The rectifier device is generally composed of thyristor devices, heat sinks, and resistance-capacitance absorption. Usually, forced air cooling is used to dissipate heat for the rectifier device. Generally, the rectifier is installed in a closed air duct in the rectifier cabinet, and a cooling fan is used to blow or draw air to form a high-speed airflow in the air duct to discharge heat from the heat sink, the absorbing power station and the surface of the capacitor, so as to avoid overheating and damage to the rectifier.

The pumped storage unit needs to switch frequently between power generation and water pumping and other working conditions, start and stop frequently, and its excitation system rectifier cabinet should also be frequently switched on and off. The operation and stop of the cooling fan are much more frequent than conventional hydroelectric units. The air duct will be deformed frequently due to the change of the internal pressure of the air duct caused by the start and stop of the cooling fan, so higher requirements are put forward for the design of the air duct.

Contents of the invention

The purpose of the utility model is to propose a new rectifier air duct which can meet the requirement of frequent start and stop of the rectifier cabinet of the excitation system of the pumped storage unit.

In order to achieve the above-mentioned purpose of the invention, the utility model adopts the following technical solutions:

The air duct of the pumped storage unit excitation system rectifier cabinet, including the shutter air inlet located at the lower front and rear doors of the cabinet, the wind box, the front panel, the rear panel, the left and right sides of the rectifier cabinet and the air outlet on the top of the cabinet, the overall vertical state, and Including the vertically installed cooling fins, the cold air is blown to the air duct along the air inlet through the air inlet, and the air flow is formed in the air duct to take away the heat from the surface of the radiator, and the hot air is discharged from the air outlet.

The utility model has the beneficial effects of being insulated from the internal rectifying circuit, transparent and weather-resistant, securely installed, elegant in appearance, and convenient for observation and maintenance. In addition, in order to prevent the panel from being damaged due to frequent deformation, a square iron frame is fixed on the panel. The rear panel is made of epoxy board. The epoxy board has stable insulation performance, high mechanical strength, good processing performance, and is convenient for slotting and installing copper bars. The design of the entire air duct is smooth, easy to install and maintain, and the cooling effect is good, which meets the requirements of on-site operation.

Description of drawings

Figure 1 is a structural diagram of the rectifier cabinet air duct of the excitation system of the pumped storage unit.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

The structural diagram of the utility model is shown in Figure 1, the cabinet in the figure is the rectifier cabinet of the excitation system of the pumped storage unit, the turbine cooling fans M1 and M2 (6 in the figure) are located at the lower part of the cabinet, and the thyristor assembly composed of thyristor devices and heat sinks The resistance-capacity absorption device (1 in the figure) composed of SCR1-SCR6 (4 in the figure), resistors (R1-R12 in the figure) and capacitors (C1-C6 in the figure) is fixed inside the air duct in the middle of the cabinet. The air duct consists of the louver air inlet (7 in the figure), the confluence box (5 in the figure), the front panel (the installation area is shown as 3 in the figure), the rear panel (opposite to 3 in the figure), the left and right sides of the rectifier cabinet and the The air outlet (0 in the figure) is formed in a vertical state, so the heat sink is also installed vertically, and the resistance-capacity absorption device is located above the thyristor assembly. Both the heat sink and the resistance-capacity absorption device are supported by the rear panel. Three-phase AC input and DC The output is led out by the copper bar through the rear panel of the air duct. There are louver air inlets on the front and rear doors of the lower part of the cabinet, and air outlets on the top. When the fan rotates, cold air blows through the air inlets along the confluence box to the air duct. Air flow is formed in the air duct to take away the heat from the surface of the radiator, and the hot air is discharged from the air outlet. In order to prevent dust or sundries from entering the air duct, the louvers are lined with filter nets, and a reverse windshield is installed in the air outlet, and the windshield closes the air outlet when the wind stops.

The rectifier cabinet adopts a steel frame, and the left and right sides are closed by three upper, middle and lower iron plates. The side panels in the thyristor area are lined with plastic sheets to prevent short circuits between the iron plates and the thyristor components. Combination air box is composed of front and rear iron plates and left and right sides of rectifier cabinet. It gathers the wind from two fans together and increases the insulation distance between the fan and thyristor components. If only one fan is working, the combined air box can make the air duct inside The wind speed at each point is more uniform. The material of the front panel of the air duct is acrylic board, which has high light transmittance, excellent machining performance, good weather resistance, good electrical insulation, strong impact resistance, chemical corrosion resistance, high hardness, light weight and long life , Low cost, the inside of the air duct can be seen through the panel, fixed with screws (2 in the picture), easy to disassemble, and convenient for users to observe and maintain the rectifying device inside the air duct. Due to the frequent start and stop of the rectifier cabinet of the excitation system of the pumped storage unit, the panel will be deformed frequently due to the pressure change inside the air duct. In order to prevent the fixed point from being broken due to frequent movements, a square iron plate frame is installed on the fixed point of the panel to fix it. . The rear panel of the air duct is made of epoxy board. The epoxy board has stable insulation performance, high mechanical strength, good processing performance, and is convenient for slotting and installing copper bars. The distance between the front and rear panels and the left and right side iron plates and the thyristor components should be as small as possible to improve the ventilation and heat dissipation effect. For this reason, a plastic sheet should be lined between the left and right side iron plates and the thyristor components to prevent short circuit.

Claims (6)

1. The air duct of the rectifier cabinet of the excitation system of the pumped storage unit is characterized in that it includes the louver air inlet located at the front and rear doors of the lower part of the cabinet, the confluence box, the front panel, the rear panel, the left and right sides of the rectifier cabinet and the air outlet on the top of the cabinet. The vertical state also includes the vertically installed cooling fins. The cold air is blown to the air duct along the air inlet through the air inlet, and the air flow is formed in the air duct to take away the heat from the surface of the radiator, and the hot air is discharged from the air outlet. 2. The air duct of the rectifier cabinet of the excitation system of the pumped storage unit according to claim 1, wherein the louver is lined with a filter net. 3. The air duct of the rectifier cabinet of the excitation system of the pumped storage unit according to claim 1, wherein a reverse windshield is installed in the air outlet, and the windshield closes the air outlet when the wind stops. 4. The air duct of the rectifier cabinet of the excitation system of the pumped storage unit according to claim 1, characterized in that the left and right sides of the rectifier cabinet are respectively closed by three upper, middle and lower iron plates, and the side panels in the thyristor area are lined with plastic sheets to The anti-iron plate is short-circuited with the thyristor assembly. 5. The air duct of the rectifier cabinet of the excitation system of the pumped storage unit according to claim 1, characterized in that the wind concentrator is composed of front and rear iron plates and the left and right sides of the rectifier cabinet, and gathers the wind of the two fans together to increase The insulation distance between the fan and the thyristor assembly is ensured. 6. The air duct of the rectifier cabinet of the excitation system of the pumped storage unit according to claim 1, wherein the front panel is fixed with screws.