CN113190978B - Motor type selection method and system in drainage pump station - Google Patents
Motor type selection method and system in drainage pump station Download PDFInfo
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Abstract
The invention discloses a motor type selection method and a motor type selection system in a drainage pump station, wherein the motor type selection system comprises a shaft power calculation module, a rated power selection module, a rated voltage selection module and a starting mode selection module, wherein the shaft power calculation module is connected with the rated power selection module, and the rated power selection module is respectively connected with the rated voltage selection module and the starting mode selection module; the shaft power calculation module is used for calculating and obtaining the maximum shaft power of the water pump operation in the drainage pump station; the rated power selecting module is used for selecting rated power of the motor according to the maximum shaft power; the rated voltage selecting module is used for selecting the rated voltage of the motor according to the rated power of the motor; and the starting mode selection module is used for selecting a starting mode of the motor according to the rated power of the motor. The invention provides a motor type selection scheme with relatively good operation reliability, technical performance and economy of the waterlogging drainage pump station, so that the combination of a motor and the waterlogging drainage pump station is more accurate, and the operation of the waterlogging drainage pump station is more efficient.
Description
Technical Field
The invention belongs to the technical field of hydraulic engineering, and particularly relates to a motor type selection method and system in a drainage pump station.
Background
The problem of the type selection of electromechanical equipment is one of the key contents of the design of a water logging pump station, and has direct influence on the capacity of the pump station for coping with floods, waterlogging and drought. For some pump stations which are built earlier in China, due to the limitation of technical conditions at the time, the design and the selection of part of main water pumps and main motors are unreasonable, and the pump stations work in an inefficiency area for a long time. The depreciation period of large-scale electric power irrigation and drainage equipment is generally 25 years, the depreciation period of medium-scale and small-scale electric power irrigation and drainage equipment is generally 20 years, and the insulation performance and the operation efficiency of the large-scale electric power irrigation and drainage equipment are reduced due to the fact that the large-scale electric power irrigation and drainage equipment is out of service for an excessive period. In order to ensure normal operation of the whole pump station unit and improve engineering benefits, and ensure sustainable development of urban society and economy in China, redesigning and selecting types of electromechanical equipment such as motors in the pump station has become an important task at present.
Although students at home and abroad do more researches on problems such as pump station updating, because indexes of a pump station system are numerous, researches on motor problems in the process of pump station updating and reconstruction are relatively few, so that how to better select a type of a generator used in a pump station is a technical problem which needs to be solved urgently.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a motor type selection method and a motor type selection system in a drainage pump station, which can ensure the efficient operation of the pump station.
A motor type selection method in a drainage pump station comprises the following steps:
s1, obtaining the maximum shaft power of the water pump in the drainage pump station;
s2, selecting rated power of the motor according to the maximum shaft power;
and S3, selecting a motor rated voltage and a motor starting mode according to the motor rated power.
In the step S1, as an optimal scheme, a calculation formula of the maximum shaft power of the water pump in the drainage pump station is as follows:
wherein Q represents the water pump flow, H represents the design lift of the water pump, gamma represents the weight of water, eta' represents the water pump efficiency, and N represents the maximum shaft power of the water pump.
Preferably, the step S2 specifically includes the following steps:
s2.1, calculating the calculated power of the motor according to the maximum shaft power of the water pump;
s2.2, selecting rated power of the motor according to the calculated power.
Preferably, the calculation formula of the calculation power of the motor in step S2.1 is:
P N ＝KN，
wherein P is N Represents the calculated power of the motor, and K represents the safety factor.
In a preferred embodiment, in step S2.1, k=1.1 to 1.2 when N is less than 55kW, and k=1.05 to 1.1 when N is greater than or equal to 55 kW.
Preferably, in step S2.2, the motor rated power P e The conditions are satisfied: p (P) e ＞P N 。
Preferably, in step S3, the motor rated voltage is selected according to the motor rated power, specifically:
when the motor is rated at power P e 6kV is adopted for rated voltage of the motor when the rated voltage is less than 200 kW;
when the motor is rated at power P e At > 315kW, the motor voltage rating was 10kV.
Preferably, in step S3, the motor starting mode is selected according to the rated power of the motor, specifically:
when the motor is rated at power P e Less than 55kW, adopting a full-voltage direct starting mode when the rated power of the motor is smaller than the preset power, and when the rated power P of the motor is smaller than the preset power e The rated power of the motor is less than 55kw, and a step-down starting mode is adopted when the rated power of the motor is greater than a preset power, wherein the preset power is 20% -30% of the capacity of the transformer;
when the rated power of the motor meets 55kW less than or equal to P e Step-down starting mode is adopted when the power is less than 315 kW;
when the rated power of the motor meets 315kW less than or equal to P e And when the voltage is less than or equal to 1500kW, judging whether the starting current of the motor, the running current of the motor and the bus voltage drop of the pump station meet preset conditions or not when the full-voltage direct starting mode is adopted, if so, adopting the full-voltage direct starting mode, and if not, adopting the voltage drop starting mode.
Preferably, the preset conditions include:
the starting current of the motor is 5-7 times of the rated current of the motor;
the running current of the motor is 80% -90% of the rated current of the motor;
the bus voltage drop of the pump station is less than 15% of the rated voltage of the bus of the pump station;
the calculation formula of the rated current of the motor is as follows:
wherein I is e Indicating rated current of motor, P e Indicating rated power of motor, U e Representing the rated voltage of the motor, cos phi represents the power factor, and eta represents the efficiency;
the calculation formula of the bus pressure drop of the pump station is as follows:
wherein Deltaμ% represents the busbar pressure drop of the pump station, U 1 Representing the voltage of the head end of a bus of a pump station, U 2 Representing the terminal voltage of a bus of a pump station, U N And the rated voltage of the bus of the pump station is indicated.
Correspondingly, the motor type selection system in the drainage pump station further comprises a shaft power calculation module, a rated power selection module, a rated voltage selection module and a starting mode selection module, wherein the shaft power calculation module is connected with the rated power selection module, and the rated power selection module is respectively connected with the rated voltage selection module and the starting mode selection module;
the shaft power calculation module is used for calculating and obtaining the maximum shaft power of the water pump operation in the drainage pump station;
the rated power selecting module is used for selecting rated power of the motor according to the maximum shaft power;
the rated voltage selecting module is used for selecting the rated voltage of the motor according to the rated power of the motor;
and the starting mode selection module is used for selecting a starting mode of the motor according to the rated power of the motor.
The beneficial effects of the invention are as follows: the motor type selection scheme with relatively good operation reliability, technical performance and economy of the water drainage pump station is provided, the motor and the water drainage pump station can be combined more accurately, the normal water level operation working point of the water pump is located in a high-efficiency area for a long time, and the operation efficiency of the motor is also higher. Laying a foundation for efficient and long-term operation of the pump station.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for selecting motor types in a drainage pump station according to the invention;
FIG. 2 is a schematic diagram of a motor-type selection system in a drainage pump station according to the present invention;
FIG. 3 is a statistical diagram of rated power of a single motor of a pump station;
fig. 4 is a schematic diagram of a main wiring structure of a pump station electric bus station.
Detailed Description
The following specific examples are presented to illustrate the present invention, and those skilled in the art will readily appreciate the additional advantages and capabilities of the present invention as disclosed herein. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
Embodiment one:
water conservancy is an important basic industry of national economy in Zhejiang province, and drainage pump station engineering is an important component of water conservancy engineering, and the electromechanical drainage and irrigation engineering in Zhejiang province bears 41% of farmland irrigation and 70% of farmland drainage tasks, plays an extremely important role in water regulation, urban water supply and drainage, urban flood control and drainage, water environment improvement and the like, and plays a great role in Zhejiang province agricultural production and national economic development. The invention researches the update and transformation of the pump station engineering, namely, under the condition of comprehensively knowing the aging and the risk of the pump station in Zhejiang province, the invention performs experimental study on the type selection problem of the electromechanical equipment in the pump station, in particular to the type selection and allocation scheme of the motor, thereby laying a foundation for the sustainable development of the pump station engineering in Zhejiang province in the future. At present, an alternating current asynchronous motor is mainly arranged in a middle-sized pump station in Zhejiang province, and an alternating current synchronous motor is applied to a large-sized pump station. As shown in fig. 3, the ac asynchronous motor used in the medium-sized pump station is mainly 55kW, 80kW, 130kW, 155kW, and the ac synchronous motor used in the large-sized pump station is mainly 380kW, 630 kW.
The number of motors matched with 500, 700 and 900 axial flow pumps commonly used in pump stations in Zhejiang province is shown in table 1. The 500 axial flow pump mainly adopts 55kW motor work; the 700 axial flow pump mainly adopts an 80kW motor; the 900 axial flow pump mainly adopts 130kW and 155kW motors.
Table 1 statistics of matched motors of different axial flow pumps of Zhejiang province pump station
However, based on the current situation of selecting the type of the electromechanical equipment in the pump station, the comprehensive operation efficiency of the drainage pump station is not high, so referring to fig. 1, the embodiment provides a motor type selecting method in the drainage pump station aiming at the environment of the drainage pump station in Zhejiang province, comprising the following steps:
s1, obtaining the maximum shaft power of the water pump in the drainage pump station;
s2, selecting rated power of the motor according to the maximum shaft power;
and S3, selecting a motor rated voltage and a motor starting mode according to the motor rated power.
Specifically:
in step S1, the calculation formula of the maximum shaft power of the water pump in the drainage pump station is as follows:
wherein Q represents the water pump flow, H represents the design lift of the water pump, gamma represents the weight of water, eta' represents the water pump efficiency, and N represents the maximum shaft power of the water pump.
The step S2 specifically comprises the following steps:
s2.1, calculating the calculated power of the motor according to the maximum shaft power of the water pump;
s2.2, selecting rated power of the motor according to the calculated power.
The calculation formula of the calculation power of the motor in step S2.1 is:
P N ＝KN，
wherein P is N Represents the calculated power of the motor, and K represents the safety factor.
In step S2.1, k=1.1 to 1.2 when N <55kW, and k=1.05 to 1.1 when N >55 kW.
In step S2.2, the motor rated power P e The conditions are satisfied: p (P) e ＞P N 。
In step S3, the motor rated voltage is selected according to the motor rated power, specifically:
when the motor is rated at power P e Motor rated voltage of 6kV (low-voltage motor) is adopted when the voltage is less than 200 kW;
when the motor is rated at power P e Motor rated voltage of 10kV (high-voltage motor) is adopted at the time of more than 315 kW;
when the rated power of the motor meets 200-P e If the voltage is less than or equal to 315kw, the low voltage or the high voltage motor is selected and determined after technical and economic comparison.
The same motor has larger difference in manufacturing cost due to different rated voltages and power factors, and the manufacturing cost of the motor is in direct proportion to the rated voltage of the motor; for asynchronous motors, it is economical to use a lower rated voltage when the single power is less than 200kW, and when the single power is greater than 315kW, the rated voltage of the motor and the motor is preferably 10kV when the technical and economic conditions are similar.
The production technology of the high-voltage motor is mature, and the production cost of the 6kV and 10kV alternating current asynchronous motors is almost equal, so that the market price is not greatly different. If the voltage is selected between 6kV and 10kV, the research recommends to select 10kV. Since 6kV electrical equipment manufacturers are few, later maintenance is difficult. In addition, the rural power supply network mainly takes 10kV and 35kV voltage levels, and if a 10kV alternating current asynchronous motor is selected, a main transformer is omitted in a wiring scheme of a power supply system, so that investment is saved, and a power supply link is simplified. If the power grid is directly supplied to the power supply of the electric equipment in the mountain lake pump station in Taizhou of Zhejiang province, the advantages of infinite power supply can be realized, the circuit is simplified, the switches are reduced, the land is saved, and the investment is saved. As shown in fig. 4, the main wiring of the pump station can be known from the main wiring of the electric system, and the 7 high-voltage motors are powered by the high-voltage power distribution cabinet and the high-voltage control cabinet, so that the circuit is clear, simple and practical, the control links are few, and the maintenance amount is also small.
In step S3, the motor starting mode is selected according to the rated power of the motor, specifically:
when the motor is rated at power P e Less than 55kW, adopting a full-voltage direct starting mode when the rated power of the motor is smaller than the preset power, and when the rated power P of the motor is smaller than the preset power e The rated power of the motor is less than 55kw, and a step-down starting mode is adopted when the rated power of the motor is greater than a preset power, wherein the preset power is 20% -30% of the capacity of the transformer;
when the rated power of the motor meets 55kW less than or equal to P e When the power is less than 315kW, a step-down starting mode is adopted, and a soft starting mode is adopted specifically;
when the rated power of the motor meets 315kW less than or equal to P e And when the voltage is less than or equal to 1500kW, judging whether the starting current of the motor, the running current of the motor and the bus voltage drop of the pump station meet preset conditions or not when the full-voltage direct starting mode is adopted, if so, adopting the full-voltage direct starting mode, and if not, adopting the voltage drop starting mode.
The preset conditions include:
the starting current of the motor is 5-7 times of the rated current of the motor;
the running current of the motor is 80% -90% of the rated current of the motor;
the bus voltage drop of the pump station is less than 15% of the rated voltage of the bus of the pump station;
the calculation formula of the rated current of the motor is as follows:
wherein I is e Indicating rated current of motor, P e Indicating rated power of motor, U e Representing the rated voltage of the motor, cos phi represents the power factor, and eta represents the efficiency;
the calculation formula of the bus pressure drop of the pump station is as follows:
wherein Deltaμ% represents the busbar pressure drop of the pump station, U 1 Representing the voltage of the head end of a bus of a pump station, U 2 Representing the terminal voltage of a bus of a pump station, U N Indicating rated voltage of bus of pump station, U N Typically 380V.
In general, the starting modes of the motor can be classified into the starting modes of the motor according to the parameters of the power grid and the conditions of the geographical and economic environment of the area: direct start, star delta step-down start, one-time series resistor start, autotransformer step-down start, magnetic control step-down start and variable frequency speed regulation start methods.
Full pressure direct start. The current required by the motor during starting is 4-8 times of the nominal current, and the starting torque is 0.5-1.5 times of the nominal torque, but because the starting current is high, a high torque peak value can appear, and large impact can be generated on the water pump, the starting mode is only suitable for starting the motor with smaller power.
Star delta step down start. The starting current is 1.8-2.6 times of the nominal current. Although the current can be greatly reduced during the star-delta voltage reduction starting, the motor is also provided with a plurality of leading-out ports, and the star-delta can be finally switched after the current contactor is disconnected for shunting. The contact of the contactor is deposited with carbon after multiple starting, so that operators need to know the electrical knowledge, clean and maintain the contactor to ensure the normal operation of the contactor, and the method is generally only suitable for no-load starting of the motor or the use of low-resistance torque.
The series resistor is started once. The series resistor is started once, namely a variable resistor under the condition of stator side series, and is generally started by adopting a thermal resistor or a liquid resistor. This start-up mode is an energy-consuming reduced-pressure start-up mode, because it consumes a large amount of electrical energy when starting up. Unlike star delta step-down start, the frequency of one series resistor start is less, but the control capability is weakened because of larger influence of external environment, and meanwhile, the starting current is larger, so that the load is often influenced more, the volume and the weight of the unit are larger, and once maintenance is needed, the workload is larger. Its advantages are simple technology, low cost and no harmonic wave.
The auto-coupling step-down starts. The self-coupling step-down starting mode mainly comprises the steps of connecting a self-coupling transformer to a stator winding of a motor in series, thus, the starting voltage is reduced, and the cut-off is performed after the starting is completed. The self-coupling voltage-reducing starting mode is characterized by smaller starting current, so that the self-coupling voltage-reducing starting mode is suitable for a state with larger resistance moment, but has the defects that the moment becomes larger suddenly in the starting process, the occurrence will occur, and the weight of the whole unit is larger.
Magnetic control type voltage reducing starting. The magnetically controlled step-down starting is to string a saturation reactor on the stator side, and to control the saturation degree of the iron core by changing the DC exciting current, so as to change the AC reactance value. The alternating current reactance is very small when the iron core is saturated, so that the voltage obtained by the motor is high; the iron core is unsaturated, the alternating current reactance is large, so that the stator voltage is reduced, and the step-down starting is realized. The magnetic control type step-down starting has better controllability and better constant current performance, but the voltage regulating range is smaller, so that larger torque abrupt change still exists in the starting process, the starting current is larger, and in addition, the equipment is large and heavy.
Intelligent soft start. The soft start mode is to use three-phase positive and negative parallel thyristors as voltage regulator to connect the voltage regulator between the power supply and the motor stator. By adjusting the trigger pulse trigger angle on the thyristor, the voltage of the motor is increased steadily and orderly, and finally, the motor starts to accelerate and start normally. At the moment, the motor can realize smooth starting on the mechanical property of rated voltage, thereby reducing starting current and avoiding tripping phenomenon caused by over-speed starting. When the motor can reach a certain rotating speed, the soft starter automatically replaces the thyristor which has completed the task by using the bypass contactor, and rated voltage is provided for normal operation of the motor, so that the heat loss of the thyristor is reduced, the service life of the soft starter is prolonged, the working efficiency of the soft starter is improved, and meanwhile, the power grid is prevented from harmonic pollution. Along with the development of economy, the intelligent soft start can also be automatically adjusted according to the current and voltage, so that the labor cost is effectively reduced, and if the soft stop function is to reverse the soft stop and soft start process, the original starting voltage can be slowly lowered, and the revolution is gradually lowered to zero, thereby effectively avoiding torque impact caused by free stop and reducing impact of water hammer on a water pump.
According to pump station design specification, the unit should preferably adopt a full-voltage direct starting mode, but the voltage drop of the bus is not more than 15% of rated voltage. In general, a pump station motor with the rated power of less than 55kW is recommended to adopt a full-voltage direct starting mode under the allowable condition of the power capacity, and the capacity of the motor is less than 20% -30% of the capacity of a transformer; the pump station with rated power of more than 55kW is recommended to use a step-down starting mode (because the cost of the existing soft starter is greatly reduced, a motor requiring step-down starting is recommended to use a soft starting mode); the pump station high-voltage motor with the rated power of 315 kW-1500 kW of the single machine recommends to adopt a full-voltage direct starting mode (but the calculation of starting current and voltage loss is required, if the pump station design specification is met, the full-voltage direct starting can be adopted, and if the pump station design specification is not met, the step-down starting is required).
As shown in fig. 4, the electric bus station main wiring of the mountain lake pump station adopts a direct power supply full-voltage starting mode, and has the advantages that: firstly, the motor is not limited by a transformer, and because the motor is directly connected with a power grid, the power grid can be regarded as infinite capacity (according to experience, the maximum power of the squirrel-cage asynchronous motor which is allowed to be directly started is not more than 20-30% of the capacity of a power transformer); secondly, the rated current of the high-voltage motor is small, the motor cannot be overheated, and the generated electric power is insufficient to deform the winding end part; thirdly, direct starting is carried out without intermediate links; fourth, the power supply voltage can be directly started (the starting torque and the maximum torque are proportional to the square of the voltage) when the power supply voltage is within the range of plus or minus 5 percent.
In order to ensure reliable starting, the pump station combines the characteristics of various starting modes, and three starting control modes, namely automatic, electric and manual, are suggested to be adopted for the pump station; the third manual mode is to start the motor in a short circuit mode (a contactor and a decompression starter can be used and cannot be used, so long as the breaker can bear the faults, the reliability of the pump station can be greatly improved by adopting the setting of the three starting modes.
The common protection grades of the motor are IP23, IP44, IP54, IP55, IP56 and IP65. According to the environment of the drainage pump station in Zhejiang province, the motor with the protection level of over IP23 can meet the requirements.
The beneficial effects of this embodiment are:
the motor selection for the update and transformation of the pump station can be divided into synchronous motors, asynchronous motors and mixed loading of the synchronous motors and the asynchronous motors. The medium and small-sized water logging pump station usually adopts an asynchronous motor, and the general selection basis is as follows: (1) the working performance of the motor needs to meet the working requirement of a pump; (2) the motor operation efficiency is high; (3) The influence on the power grid is small when the motor is started and normally operates; (4) The secondary wiring of motor control, measurement, protection signals and the like is as simple and reliable as possible, and the maintenance is convenient; (5) the investment cost of the whole system station engineering is low, etc. However, as the water pump in the drainage and waterlogging pump station of Zhejiang is mainly an axial-flow pump, although a small and medium-sized asynchronous motor is also adopted, the device has the characteristics of large number, multiple types, no excitation system, simple structure, small operation and maintenance quantity and the like, and the reactive compensation device is required to be arranged due to low efficiency and power factor and relatively low stability and anti-interference capability. If the power factor is compensated from 0.85 to 0.95, the compensation rate is 25%; if the compensation is 0.92, the compensation rate also needs to reach 15 percent. The compensation mode adopts static capacitor compensation and camera adjustment compensation, and the compensation effect can be increased by matching with the corresponding number of units. The motor and the water pump are reasonably matched and selected, and the operating working conditions of the pump and the motor can be kept in a high-efficiency area, so that energy sources are saved; if the selection is improper, the allowance is not available, the process requirement cannot be met, the allowance is too large, the operation efficiency is low, and the energy is wasted. Therefore, in the technical scheme of the embodiment, firstly, the maximum shaft power calculation is needed for selecting the motor in the pump station transformation, secondly, the rated power of the motor is selected according to the calculated power of the motor, the motor can be ensured to run continuously under the power, and finally, the rated voltage of the motor is selected according to the rated power of the motor so as to determine the starting mode of the motor. Through the technical scheme, the motor and the drainage pump station can be combined more accurately, so that the normal water level operation working point of the water pump is located in a high-efficiency area for a long time, and the operation efficiency of the motor is higher.
Embodiment two:
referring to fig. 2, the embodiment provides a motor type selection system in a drainage pump station, which comprises a shaft power calculation module, a rated power selection module, a rated voltage selection module and a starting mode selection module, wherein the shaft power calculation module is connected with the rated power selection module, and the rated power selection module is respectively connected with the rated voltage selection module and the starting mode selection module;
the shaft power calculation module is used for calculating and obtaining the maximum shaft power of the water pump operation in the drainage pump station;
the rated power selecting module is used for selecting rated power of the motor according to the maximum shaft power;
the rated voltage selecting module is used for selecting the rated voltage of the motor according to the rated power of the motor;
and the starting mode selection module is used for selecting a starting mode of the motor according to the rated power of the motor.
The above examples are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the protection scope of the present invention without departing from the design spirit of the present invention.
Claims (8)
1. A motor type selection method in a drainage pump station is characterized by comprising the following steps:
s1, obtaining the maximum shaft power of the water pump in the drainage pump station;
s2, selecting rated power of the motor according to the maximum shaft power;
s3, selecting a motor rated voltage and a motor starting mode according to the motor rated power;
in step S3, the motor rated voltage is selected according to the motor rated power, specifically:
when the motor is rated at power P e 6kV is adopted for rated voltage of the motor when the rated voltage is less than 200 kW;
when the motor is rated at power P e The rated voltage of the motor is 10kV when the rated voltage is more than 315 kW;
the motor starting mode is specifically selected according to the rated power of the motor:
when the motor is rated at power P e Less than 55kW, adopting a full-voltage direct starting mode when the rated power of the motor is smaller than the preset power, and when the rated power P of the motor is smaller than the preset power e The rated power of the motor is less than 55kw, and a step-down starting mode is adopted when the rated power of the motor is greater than a preset power, wherein the preset power is 20% -30% of the capacity of the transformer;
when the rated power of the motor meets 55kW less than or equal to P e Step-down starting mode is adopted when the power is less than 315 kW;
when the rated power of the motor meets 315kW less than or equal to P e And when the voltage is less than or equal to 1500kW, judging whether the starting current of the motor, the running current of the motor and the bus voltage drop of the pump station meet preset conditions or not when the full-voltage direct starting mode is adopted, if so, adopting the full-voltage direct starting mode, and if not, adopting the voltage drop starting mode.
2. The method for selecting the type of the motor in the drainage pump station according to claim 1, wherein in the step S1, a calculation formula of the maximum shaft power of the operation of the water pump in the drainage pump station is as follows:
wherein Q represents the water pump flow, H represents the design lift of the water pump, gamma represents the weight of water, eta' represents the water pump efficiency, and N represents the maximum shaft power of the water pump.
3. The method for selecting the type of the motor in the drainage pump station according to claim 2, wherein the step S2 specifically comprises the following steps:
s2.1, calculating the calculated power of the motor according to the maximum shaft power of the water pump;
s2.2, selecting rated power of the motor according to the calculated power.
4. A method for selecting a motor in a drainage pump station according to claim 3, wherein the calculation formula of the calculation power of the motor in step S2.1 is:
P N ＝KN
wherein P is N Represents the calculated power of the motor, and K represents the safety factor.
5. The method of claim 4, wherein in step S2.1, k=1.1 to 1.2 when N is less than 55kW, and k=1.05 to 1.1 when N is greater than or equal to 55 kW.
6. The method of selecting a motor for a pump station for water logging as claimed in claim 4, wherein in step S2.2, the rated power P of the motor is set e The conditions are satisfied: p (P) e ＞P N 。
7. The method for selecting the type of the motor in the drainage pump station according to claim 1, wherein the preset conditions comprise:
the starting current of the motor is 5-7 times of the rated current of the motor;
the running current of the motor is 80% -90% of the rated current of the motor;
the bus voltage drop of the pump station is less than 15% of the rated voltage of the bus of the pump station;
the calculation formula of the rated current of the motor is as follows:
wherein I is e Indicating rated current of motor, P e Indicating rated power of motor, U e Representing the rated voltage of the motor, cos phi represents the power factor, and eta represents the efficiency;
the calculation formula of the bus pressure drop of the pump station is as follows:
wherein Deltaμ% represents the busbar pressure drop of the pump station, U 1 Representing the voltage of the head end of a bus of a pump station, U 2 Representing the terminal voltage of a bus of a pump station, U N And the rated voltage of the bus of the pump station is indicated.
8. The motor type selection system in the drainage pump station is characterized by comprising a shaft power calculation module, a rated power selection module, a rated voltage selection module and a starting mode selection module, wherein the shaft power calculation module is connected with the rated power selection module, and the rated power selection module is respectively connected with the rated voltage selection module and the starting mode selection module;
the shaft power calculation module is used for calculating and obtaining the maximum shaft power of the water pump operation in the drainage pump station;
the rated power selecting module is used for selecting rated power of the motor according to the maximum shaft power;
the rated voltage selecting module is used for selecting the rated voltage of the motor according to the rated power of the motor;
the starting mode selection module is used for selecting a motor starting mode according to the rated power of the motor;
the motor rated voltage is specifically selected according to the motor rated power:
when the motor is rated at power P e 6kV is adopted for rated voltage of the motor when the rated voltage is less than 200 kW;
when the motor is rated at power P e The rated voltage of the motor is 10kV when the rated voltage is more than 315 kW;
the motor starting mode is specifically selected according to the rated power of the motor:
when the motor is rated at power P e Less than 55kW, adopting a full-voltage direct starting mode when the rated power of the motor is smaller than the preset power, and when the rated power P of the motor is smaller than the preset power e The rated power of the motor is less than 55kw, and a step-down starting mode is adopted when the rated power of the motor is greater than a preset power, wherein the preset power is 20% -30% of the capacity of the transformer;
when the rated power of the motor meets 55kW less than or equal to P e Step-down starting mode is adopted when the power is less than 315 kW;
when the rated power of the motor meets 315kW less than or equal to P e And when the voltage is less than or equal to 1500kW, judging whether the starting current of the motor, the running current of the motor and the bus voltage drop of the pump station meet preset conditions or not when the full-voltage direct starting mode is adopted, if so, adopting the full-voltage direct starting mode, and if not, adopting the voltage drop starting mode.
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