CN205669496U - The test device of high-power electric pump group - Google Patents
The test device of high-power electric pump group Download PDFInfo
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- CN205669496U CN205669496U CN201620610741.6U CN201620610741U CN205669496U CN 205669496 U CN205669496 U CN 205669496U CN 201620610741 U CN201620610741 U CN 201620610741U CN 205669496 U CN205669496 U CN 205669496U
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Abstract
The utility model relates to electric water pump technical field of measurement and test, discloses the test device of a kind of high-power electric pump group.For coordinating the operation characteristic of motor and water pump, the output voltage of design generator is 50% increase by 3 ~ 5% compensation of motor rated supply voltage.Supply unit both can apply the low-pressure electric pump group of 380V it can also be used to detect the high-pressure electric pump group of 6kV or 10kV rank.During for reducing motor start-up, it is impacted by electric current, implements secondary frequency reducing/step-down soft starting mode to motor.The power output of test device of the present utility model is only required to be the 12.5% of detected electrodynamic pump group rated shaft power.To build capacity less due to required, and investment cost can be made significantly to drop to the degree that all pump factories can bear.This test device can meet the demand that water pump industry is tested about hydraulic performance test specification by existing country completely.
Description
Technical field
The utility model relates to electric water pump technical field of measurement and test.
Background technology
The testboard bay construction of high-power electric pump group is huge due to capital fund, particularly high-voltage fence inadequate resource
Local (more than the motor of 200kW, be mostly the power supply of 6kV/10kV), the distribution of 1 conventional～2MVA of pump factory to be obtained is
Extremely difficult thing.This annoyings the manufacturing enterprise of China's middle-size and small-size electrodynamic pump group always, so most enterprise just selects
Do not test after motor is complete with pump head assembling and directly dispatch from the factory.This cannot ensure the quality of product at all, particularly has strict
The fire-fighting pump-feeding group of quality requirement more cannot get ensureing.The problem that this reality exists not only endangers public security but also largely effect on
The development of industry.
International standard: ISO 9906 and national standard: GB/T 3216 " rotary motive power pump hydraulic performance acceptance test 1 grade and
2 grades " regulation: " flow, lift and input work can be carried out under the test speed in the range of the 50%～120% of regulation rotating speed
Rate determines test ".
Current most water pump factory tests except new product form to be done, and is substantially employing 4 pole motors and drives
Move the water pump of 2900 turns, use 8 pole motors to drive 1450 turns of water pumps.Drive with the motor of small-power multi-pole and relatively lack number of poles
The method of relatively high power water pump test and (can also be configured powerful variable-frequency motor, by frequency reducing/bigger work(of reduction of speed test
The water pump of rate).Although but this method solves the problem of power capacity, but single Water pump head can only be gone out
Factory tests, and can not test the electrodynamic pump unit after complete, particularly can not be to the big work(being configured with high-tension motor
Rate pump group carries out functional check.Certainly there is the enterprise of Relative resource, not only can build special high voltage power distribution room, can also join
Set high voltage variable-frequency power supply.It but its construction cost is huge, is that the manufacturing enterprise of middle-size and small-size electrodynamic pump group is difficult to bear.
Utility model content
The practical problem that the utility model exists for above-mentioned water pump industry, for the electric water pump group after complete, especially
It is configured with the high-power electric pump group of high-tension motor, the solution of complete set is provided for its exfactory inspection, provide one
Plant the test device of high-power electric pump group.The utility model is the solution of a kind of high performance-price ratio: design one is civil power
The electricity generation system of rated frequency 50% is as the test power supply of water pump, and the power output of test power supply is detected electrodynamic pump group
12.5%.Owing to required power output is less, its investment cost is greatly reduced, and can meet the need of water pump industry completely
Ask.
The technical solution of the utility model is as follows:
The test device of high-power electric pump group, including engine, reduction box, Hooks coupling universal coupling, synchronous generator and
Intelligent controller.Engine passes through reduction box and Hooks coupling universal coupling and drives synchronous generator, engine by intelligent controller control,
Synchronous generator includes exciter control system, it is characterised in that also include the output breaker containing relay protection, step-up transformer,
Electrical connection distribution system, synchronous generator output is connected with step-up transformer by exporting breaker, is electrically connected distribution
System includes that the low tension parameter metrology device being arranged at the output of output breaker is defeated with the boosting being arranged at step-up transformer
Going out the high-tension electricity parameter metrology device in loop, output breaker also is used for realizing tested high-power electric pump by intelligent controller control
The soft start of group closes a floodgate.Enter testing process when, the real-time rotating speed of high-power electric pump group be its rated speed 50%～
60%.High-power electric pump group typically refers to the electrodynamic pump group not less than 200kW for the power.
Further, in order to meet the multipurpose of this test device, high-pressure electric pump group can be tested, also can be right
Low-pressure electric pump group is tested, and electrical connection distribution system also includes double loop switching switch, and output breaker is through double loop
Switching switch is optional to be connected with step-up transformer, or another output selecting double loop to switch switch directly exports low tension
Source.
Further, reduction box is the reduction box of 2:1.
Further, engine is Diesel engine, and rated speed is 1500～1800rpm.
Further, synchronous generator is 4 pole brushless generators, and output frequency is 25～30Hz, and output line voltage is can
Adjust 110～240V.
The method of testing of the test device of high-power electric pump group, uses test device as above, synchronous generator
Output frequency during constant speed is the 50～60% of the rated frequency of tested high-power electric pump group, uses secondary frequency reducing/step-down side
Formula start high-power electric pump group: synchronous generator in tested high-power electric pump group start-up course slow raising speed and synchronize liter
Pressure, then synchronous generator constant speed, constant voltage continuous service；During startup, when the output frequency of synchronous generator is not up to the first frequency
During rate threshold value, intelligent controller makes output breaker be in off state, when the output frequency of synchronous generator reaches the first frequency
During rate threshold value, output breaker closing to being test for high-power electric pump group power transmission, defeated when first frequency threshold value is constant speed
Going out the 66～67% of frequency, after output power transmission band carries, the slow raising speed of synchronous generator simultaneously synchronizes a liter high voltage, until it reaches specified
Frequency, then constant speed, constant voltage continuous service, the magnitude of voltage of constant voltage is the rated frequency/voltage ratio of high-power electric pump group
Increasing 3～5% after conversion, tested high-power electric pump group formally enters test.
Theoretical foundation of the present utility model is as follows:
Same blade pump characteristics, the proportionate relationship between its flow, lift, power and rotating speed:
(flow of water pump is changing into direct ratio with pump rotary speed)
(water pump lift and pump rotary speed change square be directly proportional)
(shaft power of water pump and pump rotary speed change cube be directly proportional)
Q, H, N represent pump capacity, lift, power respectively；N represents the rotating speed of water pump.
Subscript 1 relative to the physical quantity of rotating speed 1, subscript 2 relative to the physical quantity of rotating speed 2.
According to above-mentioned formula, the running speed of water pump reduces by 50%, and its shaft power is full speedI.e.
12.5%.Calculate by this, a water pump needing input power to be 1000kW (1MW), in the case that its structure is constant, reduce by 50%
Rotating speed run, the power >=125kW needed for its water pump can meet product export test needs.
Reducing the rotating speed of motor, the most simple and effective way is just to provide low-frequency power supply, reduction of speed 50%, it is simply that will
Primary standard motor designs be the supply frequency frequency reducing of 50Hz be 25Hz.
The frequency of power-supply system it is determined that, the determination method of the output voltage of power-supply system is given below.
Stator voltage according to motor: U=E+I*R (I be electric current, R be stator inductance and the composite impedance of D.C. resistance, E
For induced potential)；
And: E=k*f*X (k: constant, f: frequency, X: magnetic flux)；
For asynchronous machine: T=k*I*X (k: constant, I: electric current, X: magnetic flux, T: torque)
Induced potential E is as frequency f and changes, then the voltage of stator should also be change, is namely added in stator
The voltage at two ends also should be the change that is directly proportional therewith.
The power calculation of motor:
A, threephase motor the computing formula of input power as follows:
P in formula1x: frequency is fxWhen motor input power, kW；
U1x: frequency is fxWhen motor input line voltage, V；
I1: the electric current of the every phase of motor, A；
The power factor of motor stator side.
B, the power output of motor: motor output is mechanical output, and computing formula is as follows:
P in formulaMX: frequency is fXWhen motor reel on power output, kW；
TM: the torque (balancing each other with load torque) of motor, N m；
nMX: frequency is fXWhen rotating speed, r/min.
C, electromagnetic power: the magnet power of transmission and transformation between electrical power and mechanical output, use PMRepresent.
Its size reflects the size of magnetic flux in motor magnetic circuit.
The change of each several part power when frequency declines: assume frequency f of supply voltageXReduce, at this moment, turning of motor
Speed must decline:
F in formulaX: the operating frequency of motor, Hz；
nMX: frequency is fXWhen rotating speed, r/min；
P: be motor number of pole-pairs, the p=2 of such as quadrupole motor；
S: slip of induction motor.
For vane pump, in the case of passing in and out bore and impeller diameter is constant, the lower general who has surrendered of motor speed causes defeated
Go out power significantly to decline；But, input power P1 of motorXShow, there is no between the input power of motor and frequency
Direct relation, that is, when frequency decline supply voltage is constant, the input power of motor does not decline therewith.
So, when merely frequency being declined, will appear from input power P1XWith power output PMXBetween serious unbalance,
Making the electromagnetic power of transmission energy and magnetic flux be significantly increased, the magnetic circuit of motor will be seriously saturated, cause exciting current increase sharply and
Waveform generation Severe distortion.
If so reducing the frequency of power supply, in order to maintain the balance between input power and power output, declining in frequency
While, it is necessary to must synchronize to reduce the voltage of power supply.
But, if completely proportionally reduce voltage when frequency declines, then make motor owing to frequency declines
AC impedance diminishes, and the D.C. resistance of motor remains unchanged.This will result in torque after reduction of speed for the motor relative
Reduce, thus cause the slip of asynchronous motor to increase (the actual rotating speed not reaching former motor half).Finally affect water pump
Lift, flow, the measurement data of power.Therefore, when motor frequency reducing ratio are depressured and use, the electricity of input motor to be made
Pressure is corresponding to be improved, and just can maintain the ratio that the intrinsic torque of motor reduces.
China is by the reference voltage of the asynchronous machine of standard production: low voltage motor be 380V, high-voltage motor be 6kV or
10kV, reference frequency is 50Hz.By the test power-supply system of low-tension motor design, if frequency reduces by 50% to 25Hz, then electricity
The supply voltage of motivation then should be 380V*0.5=190V, is verified by stand, and supply voltage raises 3～5% (different numbers of poles
Motor slightly difference, but all in allowed band), such as 190V*1.05 ≈ 200V, can compensated motor lead because of frequency reducing
The D.C. resistance loss causing.In like manner: the input of 6kV design of electrical motor power supply for the input of 3.15kV, 10kV design of electrical motor power supply is
5.25kV.Both met the required precision of test, the phenomenon that motor supercurrent runs will not occur again.
The synchronous generator rated output voltage of power distribution equipment determines, but how the operation characteristic of generator designs ability
The starting current of adaptation asynchronous motor, this is still that a problem that must solve.It is known that: common motor start-up
Process still needs to the starting current of relatively big (several times), and diesel generating set overload capacity is very limited, and (internal combustion engine surpasses moment of torsion, has
May suddenly shut down at short notice).The standard design of diesel generating set, just only increases the appearance of generating set routinely
Amount！The utility model uses secondary for the adaptive power preferably mating electric motor starting characteristic and reduce generating set, innovation
Frequency reducing/step-down mode starts electric pump group: the generating set of design realizes slow raising speed in starting process of motor and synchronizes to rise
Pressure, last diesel generating set constant speed, constant voltage continuous service.Due to vane pump when the slow-speed of revolution torque relative drop, so only
Select to allow band to carry at diesel engine, and its output moment of torsion meets the rotation speed requirements of water pump operation, it is possible at lower rotating speed
(output voltage of synchronization reduction engine) drags detected water pump group soft start.In fact, the bavin of rated speed 1500rpm
Oil machine, the rotating speed point at 1000rpm all allows the lighter load running of band.The utility model design is after diesel engine starting success
Rotating speed reaches 1000rpm, and (generator driving through 2:1 decelerator is that 500rpm runs, alternator output frequency ≈ 16.7Hz
(the A point of Fig. 3), rotating speed 500rpm:750rpm ≈ 0.67, then the output voltage of generator also synchronous adjustment is 200*0.67=
134V), breaker closing is now exported to being test for motor power transmission.Now by said frequencies, voltage, the calculating public affairs of power
Formula calculates, the load power being test for water pump group is about (0.67) when 25Hz runs3≈ 30% (greatly reduces startup electricity
Stream is to sending out/the impact of power distribution equipment).After output power transmission band carries, generator set slow raising speed simultaneously synchronizes a liter high voltage (Fig. 3 curve
A～B slope section), until it reaches after specified frequency 25Hz/200V (Fig. 3 B point) output, constant speed, constant voltage continuous service, quilt
The water pump group surveyed can formally enter test program.
Compared with prior art, the utility model combines diesel engine speed regulation control, generator excitation control, is just press-fitted
The technology such as electricity, use the 25Hz low frequency synchronisation generating set of less generated output directly to drive the electrodynamic pump group of relatively high power, so
Complete the test of the key property to high-power electric water pump group by closing the conversion of symbol specification afterwards.The utility model also uses soft opening
Dynamic mode, thus when solving motor start-up, cause engine to surpass the problem that moment of torsion is shut down, it is high-power electric pump group
Test provides a kind of practicable solution.
Brief description
Fig. 1 is the schematic diagram of the utility model measurement apparatus；
Fig. 2 is the construction profile figure of the utility model measurement apparatus；
Fig. 3 is the performance diagram with voltage for the alternator output frequency of embodiment.
Detailed description of the invention
Below in conjunction with embodiment, the utility model is described further.
Embodiment
1st, synchronous generator 4 uses the 4 pole synchronous generators of output 25Hz, and its synchronous rotational speed is 750rpm.
2nd, synchronous generator 4 drags after using Diesel engine 1 speed change indirectly, and the rated speed of Diesel engine 1 is
1500rpm (may be alternatively provided as 1800rpm to run), and Diesel engine 1 connects Hooks coupling universal coupling 3 to together by the reduction box 2 of 2:1
Step generator 4 exports driving of 750rpm (synchronous generator rotating speed being 900rpm when rotary speed of diesel engine is set to 1800rpm)
Dynamic torque.
3rd, synchronous generator 4 output frequency is that (when Diesel engine 1 is set to 1800rpm, generation frequency is 25Hz
30Hz), output line voltage is that low pressure 200V (may be designed as 110～240V adjustable, meets the motor of multiple different electric pressure
Test).
4th, the output voltage regulation of synchronous generator 4 is controlled by exciter control system 41, when synchronous generator 4 was starting
Output frequency≤the 16.7Hz (0～A point of Fig. 3) of journey, the exciting current output of exciter control system 41 is turned off (avoids generating
Machine low speed is crossed and is encouraged), synchronous generator 4 is by the remanent magnetism generating of rotor.Rotating speed after unit starting continues to raise, and works as synchronous generator
Output frequency >=the 16.7Hz of 4, exciter control system 41 controls synchronous generator 4 and exports 134V, meanwhile, synchronous generator
4 output breakers 5 below close a floodgate, and to being test for pump motor power transmission, are test for water pump under the low frequency of 16.7Hz
Soft start.Output breaker 5 closes a floodgate after power transmission, and exciter control system 41 raises Synchronization Control with the rotating speed of synchronous generator 4
Increasing the exciting current of synchronous generator 4, the output voltage making synchronous generator 4 is identical with the slope of raising speed (raising frequency).Finally
Under low-down starting current " impacts ", power distribution equipment smoothly completes the soft start of high-power electric pump group.
5th, the 200V line voltage of synchronous generator 4 output is by output breaker 5, the double back of electrical connection distribution system 7
Road switches switch 72, and double loop switching switch 72 may select low pressure output 10, and (output drives 380V low-tension motor water pump group
Power supply), or (output drives the high pressure of 10kV high-tension motor water pump group to select to be upgraded to output after high pressure 9 by step-up transformer 6
Power supply).
6th, step-up transformer 6 operating frequency is 25Hz (allowing+20%, can increase the test to 60Hz motor), primary
Voltage is 200V (allowing+20%, can be adapted to the test to 60Hz motor), and secondary voltage is that (permission+20%, can for 5.25kV
The high-tension motor to 60Hz for the adaptation is tested), capacity is that 320kVA (is the electric water pump of 2MW to the maximum based on design detection
Group, can be according to the size of actual testing load, by the adaptation capacity of above-mentioned computing formula re-optimization unit).
7th, it is electrically connected distribution system 7 and comprise low-pressure gage measuring device the 71st, high-pressure gauge measuring device 73 and double loop switching switch 72.
8th, the output breaker 5 of synchronous generator 4 power transmission comprises the combined power protection of a whole set of electricity generation system.
9th, Diesel engine 1 is completed startup, raising speed, constant speed, loading, unloading, reduction of speed and cooling shutdown by intelligent controller 8
Deng process control, operational monitoring and fault alarm and protection.
10th, the result of test after reduction of speed 50%, by constant for flow * the 2nd, lift * the 4th, power * the 8th, the power factor (PF) now recording,
The operational factor of tested electrodynamic pump group can be extrapolated.
11st, in order to adapt to the test to 60Hz electric water pump group, the Diesel engine 1 of test device is selected can 1500rpm
Type with two kinds of rotating speed switchover operations of 1800rpm.Synchronous generator 4 designs and corresponding is output as two kinds of frequencies of 25Hz or 30Hz
Rate.Meanwhile, the output voltage of synchronous generator 4 can be carried out according to different electric pressures by above-mentioned computational methods completely
Design.
Claims (5)
1. the test device of high-power electric pump group, including engine (1), reduction box (2), Hooks coupling universal coupling (3), synchronous generator
Machine (4) and intelligent controller (8), engine (1) passes through reduction box (2) and Hooks coupling universal coupling (3) drives synchronous generator
(4), engine (1) is controlled by intelligent controller (8), and synchronous generator (4) includes exciter control system (41), it is characterised in that also
Including output breaker (5) containing relay protection, step-up transformer (6) and electrical connection distribution system (7), synchronous generator
(4) output is connected with step-up transformer (6) by output breaker (5), is electrically connected distribution system (7) and includes being arranged at defeated
Go out low tension parameter metrology device (71) of the output of breaker (5) and the boosting output loop being arranged at step-up transformer (6)
High-tension electricity parameter metrology device (73), output breaker (5) also by intelligent controller (8) control be used for realizing tested large power, electrically
The soft start of dynamic pump group closes a floodgate, when entering testing process, the real-time rotating speed of high-power electric pump group be its rated speed 50% ~
60%。
2. the test device of high-power electric pump group according to claim 1, it is characterised in that electrical connection distribution system
(7) also including double loop switching switch (72), output breaker (5) is through double loop switching switch (72) and step-up transformer (6)
Being connected, another output of double loop switching switch (72) directly exports low-tension supply.
3. the test device of high-power electric pump group according to claim 1, it is characterised in that reduction box (2) is 2:1's
Reduction box.
4. the test device of high-power electric pump group according to claim 1, it is characterised in that engine (1) is that diesel oil is sent out
Motivation, rated speed is 1500 ~ 1800 rpm.
5. the test device of high-power electric pump group according to claim 1, it is characterised in that synchronous generator (4) is 4
Pole brushless generator, output frequency is 25 ~ 30 Hz, and output line voltage is 110 ~ 240V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620610741.6U CN205669496U (en) | 2016-06-17 | 2016-06-17 | The test device of high-power electric pump group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620610741.6U CN205669496U (en) | 2016-06-17 | 2016-06-17 | The test device of high-power electric pump group |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205669496U true CN205669496U (en) | 2016-11-02 |
Family
ID=57192528
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620610741.6U Withdrawn - After Issue CN205669496U (en) | 2016-06-17 | 2016-06-17 | The test device of high-power electric pump group |
Country Status (1)
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| CN (1) | CN205669496U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952662A (en) * | 2016-06-17 | 2016-09-21 | 广州三业科技有限公司 | Testing device and method for high-power electric pump set |
-
2016
- 2016-06-17 CN CN201620610741.6U patent/CN205669496U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952662A (en) * | 2016-06-17 | 2016-09-21 | 广州三业科技有限公司 | Testing device and method for high-power electric pump set |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161102 Effective date of abandoning: 20171020 |