CN1314197C - Increasable capacity integrated installation of high-low voltage variable frequency speed control - Google Patents
Increasable capacity integrated installation of high-low voltage variable frequency speed control Download PDFInfo
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Abstract
The present invention relates to a capacitance-extending type high-low voltage frequency-conversion speed-regulating integrated device which is characterized in that the output terminal of a high-voltage switch cabinet Cm is connected with the high-voltage input terminal of a transformer T; the low-voltage output terminal of the transformer T is connected with the wire inlet terminal of an input-side switch Ct of the frequency converter in a power-frequency /frequency-conversion switching device; the wire outlet terminal of the switch Ct is connected with the input terminal of a low-voltage frequency converter LF of which the output terminal is connected with the wire inlet terminal of the output-side switch Cf of the frequency converter LF; the wire outlet of the switch Cf is connected with a capacitance-extending low-voltage frequency-conversion speed-regulating motor HM`; a bypass switch Cw in the power-frequency /frequency-conversion switching device is connected with the low-voltage output terminal of the transformer T and the motor HM` in parallel. The present invention is widely suitable for the improvement on the capacitance-extending, frequency-conversion, speed-regulating and energy-saving technology of a high-voltage motor, reaches the economic purposes of high power, high efficiency, high power factor, high reliability, low harmonic, low temperature rise, energy saving and material saving, etc., by little investment and short construction period.
Description
Technical field
The present invention relates to high-tension motor, especially a kind of high-tension motor increasing volume type height-low-voltage variable frequency speed governing integrating device.
Background technology
As everyone knows, the total power consumption of the various motor of China accounts for more than 60% of national overall consumption electric weight, wherein, 10kV and above high pressure, the middle voltage electromotor of 3～6kV, people are referred to as high-tension motor habitually, comparing with low-tension motor, though be about 20%: 80% on the ratio of quantity (platform number), is 60%: 40% on capacity (kW) ratio.In recent years, China's overall consumption electric weight is up to more than 12,000 hundred million kWh, as the power consumption by motor account for national overall consumption electric weight 60%, the power consumption of high-tension motor account for motor power consumption 60%, can the transformation rate temporarily by 30%, microcosmic (separate unit) power saving rate is only by 30% prediction, whole nation macroscopic view Spring Festival holidays electric energy Li Keda:
12000 * 60% * 60% * 30% * 30%=388.8, hundred million kWh
Be equivalent to 10 in newly-built 800,000 kW, year 5000 hours power plant of operation!
Total rate of electricity is as if calculate China's Macroscopic Spring Festival holidays electricity worth up to by 0.5 yuan/kWh:
0.5 hundred million yuan of unit/kWh * 388.8 hundred million kWh/a=194.4
For this reason, regulation in " Energy Conservation Law of the People's Republic of China " of promulgation in 1997: " development adjustable speed motor drives for energy conservation and electric-electronic power saving technology ".Wherein, the core technology of power electronics is exactly a converter technique, and variable-frequency control technique then is that the technology of electric machine speed regulation and power electronics is integrated.Particularly the high-tension motor variable-frequency control technique becomes " most important thing " in China's energy-saving technological measure in the nature of things.
At present knownly mainly contain at the variable-frequency control technique scheme that high-tension motor adopted:
Height-low-high-pressure type.It becomes the low pressure power frequency supply with the high pressure power frequency supply earlier by a step-down transformer provides low voltage frequency converter, and the low-voltage variable frequency power supply with frequency converter output becomes the high-pressure frequency-conversion power supply by a step-up transformer again, and the high-tension motor frequency control is provided.Its shortcoming is step-up transformer or adopts ordinary silicon steel disc magnetic material, or adopts amorphous magnetic material.Latter's cost height; Though the former transformer body cost is low, it is higher to install the output filter cost additional; Both efficient under the low frequency operating mode are low, power factor is also low, and floor space is all big.
Height-medium-pressure type.It is by single high-pressure frequency-conversion device, and the realization high voltage frequency is directly changed.Its shortcoming is that single high-pressure frequency-conversion device cost is very high, and limit by withstand voltage condition, and its rated operational voltage is in the majority with 3-4.16kV.
Height-high-pressure type.It is by many high-pressure frequency-conversion device series systems, and the realization high voltage frequency is directly changed.Its shortcoming is that the converter plant reliability of many high tension apparatus series connection is very poor, and cost is very high.
Multipleization type.It reduces to the low pressure power frequency supply of different electrical degrees by a kind of special transformer with the high pressure power frequency supply, is superimposed as multiple-pulse high-pressure frequency-conversion power supply through a plurality of low voltage frequency converter modules.Its advantage is that output waveform more approaches sine, and high order harmonic component is lower; Shortcoming is the transformer device structure complexity, disposes 15,10kV device at least as the 6kV device and disposes 24 low voltage frequency converter modules at least, thereby cause the probability of malfunction height, and system effectiveness is low, the installation cost height.
Internal feedback type.It is a kind of modified form of traditional tandem control type.No matter internal feedback, or external feedback all are based on the thyristor frequency conversion mode of speed regulation of winding-type motor.Its shortcoming: the one, wound rotor is because of its slip ring and brush troublesome maintenance, and fault is many; The 2nd, frequency converter main device thyristor carrier frequency is low, and high order harmonic component is big, has often surpassed national standard limit value 4%, and power factor is low, and speed adjustable range is narrow.Moreover the inner feedback speed-regulating definite purpose motor is bigger than the common cage electromotor volume of equal capacity, equal electric pressure, and efficient is low, the cost height.
Conventional height-low-pressure type.Adopt the transformer step-down, use common low-tension motor instead and replace the speed governing of high-tension motor enforcement low-voltage variable frequency.Because of limit by process conditions, the normal capacity of low-tension motor generally is no more than 500kW.The big capacity low pressure motor manufacturing cycle reaches more than half a year at present; Stator winding moves under pulse frequency and high order harmonic component for a long time and will speed up ageing of insulation, and even burnout failure takes place to puncture.Moreover the high-tension motor of same capability is also different with the base size of low-tension motor, must beat again the basis, and must change wheel.If change low-voltage variable frequency speed governing definite purpose motor into, not only cost is too high, and the support of the low-voltage variable frequency speed governing definite purpose motor of equal capacity is also bigger than the support of high-tension motor, certainly will also must beat again basis and replacing to wheel, makes troubles for on-the-spot the transformation!
China Patent No. 02274200.X " towards the height-low-voltage variable frequency speed governing integrating device of high-tension motor ", by at least one side winding be the extend-triangle syndeton step-down transformer T, low voltage frequency converter LF, the special voltage frequency-conversion and speed-regulation motor HM ' that utilizes common high-tension motor HM to form by the winding coupling structural change transformation of the way, and frequency conversion/power frequency diverter switch Ct, Cf, Cw institute are integrated.Its advantage is, and is simple in structure, efficient height, power factor height, reliability height, and harmonic wave is low, cost is low, the process-cycle is short.But only change pressure by the reconfiguration line, often stator winding is under-voltage and do not reach the rated power of motor.
Though more than different at the variable-frequency control technique scheme of high-tension motor, a common drawback is but arranged, be that motor is subjected to the high order harmonic component that the variable frequency power supply internal resistance is big, produce, and voltage degradation factor affecting, when the frequency conversion frequency reaches power frequency, electrical motors is less than rated power, and Here it is " motor change into exert oneself after the frequency control low ", in addition " not as fluid-flywheel clutch energetically " cause.
For example, in implementing 02274200.X patented technology process, to JS1512-8 type 6kV, a 630kW, 8 pole motors, stator winding by 1 road Y connect change 8 road Y into and connect after, rated voltage becomes 6kV ÷ 8 tunnel parallel connections=750V, adopt the under-voltage operation of the universal frequency converter of 690V, the rated power of motor drops to 630kW * 690/750=580kW, is equivalent to standard series 570kW.Can normal converting operation during underloading, but excessive current flow in motor takes place during heavy duty, promptly surpass rated current 74A * 8 tunnel parallel connections=592A.
Summary of the invention
The present invention is directed to the drawback of prior art, a kind of increasing volume type height-low-voltage variable frequency speed governing integrating device is provided, be intended to: 1. solve present high-tension motor and implement underpower operation problem in the variable-frequency control technique scheme; 2. the motor increase-volume helps improving production capacity; 3. further improve motor efficiency; 4. increment of load does not then reduce motor operation temperature rise.
Increasing volume type height-low-voltage variable frequency speed governing integrating device, by the transformer T that provides frequency converter rationally to boost increase-volume, allow the low pressure large-capacity transducer LF of overvoltage 10%～15% operation, the increasing volume type low-voltage variable frequency adjustable-speed motor HM ' that utilizes common high-tension motor to form by its stator winding wiring construction of conversion and the transformation of the way of coil insulation structure, and low-voltage variable frequency/power frequency diverter switch Ct, Cf, Cw institute is integrated, the output that it is characterized in that high-tension switch cabinet Cm is connected with the high voltage input terminal of transformer T, the end of incoming cables of frequency converter input side switch Ct in the low-voltage output of transformer T and the power frequency/frequency conversion switching device shifter is connected, the leading-out terminal of switch Ct is connected with the input of low voltage frequency converter LF, the output of frequency converter LF is connected with the end of incoming cables of the outlet side switch Cf of frequency converter LF, the leading-out terminal of switch Cf is connected with increasing volume type low-voltage variable frequency adjustable-speed motor HM ', and by-pass switch Cw in power frequency/frequency conversion switching device shifter and the low-voltage output of transformer T and motor HM ' are connected in parallel.
Increasing volume type height-low-voltage variable frequency speed governing integrating device is the modified model of the height-low-voltage variable frequency speed governing integrating device towards high-tension motor, mainly shows:
Increasing volume type low-voltage variable frequency adjustable-speed motor HM ', type groove structure adopt is opened in stator core, stator coil adopts class F insulations such as high pressure, every groove lead total sectional area/groove window area be duty ratio greater than 1/3 until 1/2.Keeping to improve 1～3 standard series power grade of former motor rated power under former high-tension motor magnetic flux density and the constant prerequisite of current density.For winding motors, by adding sectional area Sr ' of weldering at wound rotor lead-out wire root for drawing cross-sectional area copper short-circuited conducting sleeve doubly, thereby change system into cage rotor, slip ring and brush and lead-out wire thereof have not only been eradicated, and save its resistance power consumption, and change a social system the common rated power that increases motor that is complementary with stator winding.In the metastable occasion of line voltage, utilize universal low voltage frequency converter to allow the electrical network input voltage to be higher than the technical stipulation of rated voltage 10% or 15%, rationally promote the specified input voltage 5%～10% of frequency converter by transformer, and the weak magnetic dot voltage ratio parameter to 105% of frequency converter～110% is set, thereby under the constant prerequisite of frequency converter rated current, can improve its rated output capacity 5%～10%.
Below in conjunction with the drawings and specific embodiments the technical program is described in further detail.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is common Stator of HV Electromotor coil section figure.
Fig. 3 is the stator winding coil section figure after the transformation of the way of the technical program high-tension motor.
Fig. 4 is common high-tension winding type motor rotor winding lead-out wire texture edge figure.
Fig. 5 is that the technical program changes high-tension winding type motor rotor winding into mouse-cage type structure short-circuited conducting sleeve welding side view.
Fig. 6 is common power transformer winding Y connection figure.
Fig. 7 is the extend-triangle winding diagram of the technical program transformer high-voltage side or low-pressure side winding band step-up coil.
Embodiment
Fig. 1, the technical program is by can be for universal low voltage frequency converter rationally boost transformer T, the universal low pressure large-capacity transducer LF of increase-volume, the increasing volume type 380V～1140V low-voltage variable frequency adjustable-speed motor HM ' that utilizes the common high-tension motor of 3kV～10kV to form by the transformation of the way of conversion stator winding wiring construction and coil insulation structure, and low-voltage variable frequency/power frequency diverter switch Ct, Cf, Cw institute are integrated.The output of its high-tension switch cabinet Cm is connected with the high pressure winding input of transformer T, the end of incoming cables of switch Ct in the low pressure winding output of T and the power frequency/frequency conversion switching device shifter is connected, the leading-out terminal of Ct is connected with the power frequency input of frequency converter LF, the end of incoming cables of switch Cf in the frequency conversion output of LF and the power frequency/frequency conversion switching device shifter is connected, the leading-out terminal of Cf is connected with increasing volume type low-voltage variable frequency adjustable-speed motor HM ', and the input of the by-pass switch Cw in power frequency/frequency conversion switching device shifter is connected with the low-voltage output of transformer T and the input of motor HM ' respectively with output.In case internal fault takes place frequency converter LF, cuts out frequency converter by switch Ct and Cf, with the low-voltage output of transformer T and the input direct connection of motor HM ', can implement power frequency and start and power frequency operation by by-pass switch Cw.Concrete method for remanufacturing is as follows:
(1) determines height-low voltage voltage grade
The high pressure input voltage of this increasing volume type height-low-voltage variable frequency speed governing integrating device is known, i.e. user's line voltage; Low pressure then is preferred.Preferred principle is, in view of at present commercially available universal low pressure large-capacity transducer in the majority with 400V～440V and 690V, and technology maturation, reliable, function is more complete, and price is lower, for 500kW and following high-tension motor, select 400V～440V large-capacity transducer more economical; For 630kW and above high-tension motor,, should select the 690V large-capacity transducer in order to reduce low-voltage cable pressure drop and line loss.
(2) calculate this stator coil number of turn
Keeping under the constant prerequisite of former high-tension motor (air gap, stator teeth and yoke portion) magnetic flux density, this stator coil number of turn W ' is determined by following formula:
W '=WUn '/UnKw '/Kw (formula 1)
In the formula:
W---the former stator coils for high voltage motor number of turn (circle);
Un '---this increasing volume type frequency-conversion and speed-regulation motor rated voltage (V);
Un---former high-tension motor rated voltage (V);
Kw '---this motor stator winding connection constant, Y are 1 * parallel branch number, and Δ is * parallel branch number;
Kw---it is 1 that former Stator of HV Electromotor wiring constant, most 1 road Y connect, and it is that 2,1 road Δ Jie is that minority 2 road Y connect.
Appropriateness improves magnetic flux density, but new stator coil number of turn W ' inverse ratio minimizing helps further increasing motor capacity.
(3) determine the insulating material of this stator coil and lead
The insulating barrier of this stator coils of motor lead can be selected the insulation of one deck glass fiber bag.And the stator coil lead of conventional rated voltage 6kV motor adopts the insulation of layer glass silk bag, the stator coil lead of conventional rated voltage 10kV motor to adopt the insulation of triplex glass silk bag more more, so but attenuate glass fiber bag insulation thickness.
Utilize the high-grade insulation of former stator coils for high voltage motor to wrap up outward, the insulation thickness δ i ' of this stator coils of motor is determined by following formula:
δ i '=Ku (2Un+1000)/Un ' i (δ formula 2)
In the formula:
Ku---the withstand voltage coefficient of this motor stator winding, sign adapts to the ability of the crest voltage of variable-frequency pulse operating mode and high order harmonic component generation, desirable 6～10 times, for 3 mutually the frequency converter of 6 pulse output waveforms get high multiple, for be added with output filter or＞3 mutually the frequency converter of 6 pulse output waveforms get low multiple;
The withstand voltage index (V) of 2Un+1000---former Stator of HV Electromotor;
The insulation thickness of δ i---former stator coils for high voltage motor.
Adopt withstand voltage and the higher insulating material of thermal endurance class, the insulating material duty cycle, delta of this stator coil ' can and then reduce, the winding wire sectional area can and then strengthen, and helps the further increase-volume of motor.
(4) calculate this stator coil sectional area of wire
Keeping under the constant prerequisite of former stator coils for high voltage motor current in wire density, this stator coils of motor sectional area of wire Se ' is determined by following formula:
In the formula:
Kf '---this stator coils of motor activity coefficient, desirable 0.85～0.9, for single cord sectional area the greater, consider the mechanical strength of the kelvin effect of conductor current and insulating material and get low value that vice versa;
---the square root of this motor and the insulation thickness ratio of former stator coils for high voltage motor.
The duty cycle, delta cu of former high-tension motor stator slot lead total sectional area calculates:
δ cu=Scu/Sfe (formula 4)
In the formula:
Scu---former high-tension motor stator slot lead total sectional area.
Sfe---former high-tension motor stator coring groove window area.
The duty cycle, delta cu ' of this increasing volume type low-voltage variable frequency adjustable-speed motor stator slot lead total sectional area calculates:
δ cu '=Scu '/Sfe ' (formula 5)
In the formula:
Scu '---this motor stator pilot trench lead total sectional area.
Sfe '---this motor stator-core groove window area.
(5) calculate the rated current of this motor
Keeping under the constant prerequisite of former stator coils for high voltage motor current in wire density, the rated current In ' of this motor is determined by following formula:
In '=InKw '/KwSe '/Se (formula 6)
In the formula:
The rated current of In---former high-tension motor (A).
(6) calculate the rated power of this motor
The rated power Pn ' of this motor is determined by following formula:
Pn '=PnUn '/UnIn '/In (formula 7)
In the formula:
The rated power of Pn---former high-tension motor (kW).
An if motor increase-volume and increment of load not is equivalent to reduce the current density operation and can reduces motor temperature.
Present embodiment still transform example as with JS series 6kV, 630kW, 8 pole motor variable-frequency control techniques, and this motor stator winding is that 1 road Y connects, and winding wire is two gangs of 2.1 * 4.1mm
2Double glazing silk bag electromagnetic wire and around, coil is wrapped up 8 stratus master tapes outward, two coils of every groove, groove window area are wide by 15 * high 70mm, the F class F insulation.
The technical program high pressure input 6000V, low pressure is selected the 690V standard for use, and stator winding adopts 4 road Δs to connect, and calculation of parameter is as follows:
Calculate this stator coil number of turn W ' according to (formula 1):
W '=10 circles * 690V/6000V × * 4/1=8 circle
According to (formula 2), the withstand voltage COEFFICIENT K u of this stator winding gets 10 times, and the insulation thickness of calculating this stator coil is than δ i ':
δi′＝10×(2×6000V+1000V)/10×690V×δi＝0.53δi
Adopt the fixed subcoil insulating material of 3kV motor to get final product.
According to (formula 3), this stator coil activity coefficient Kf gets 0.85, calculates this stator coil sectional area of wire Se ':
Select two gangs of 2.63 * 4.7mm for use
2Single-glass silk bag electromagnetic wire and around.
According to (formula 4) and (formula 5), check the duty cycle, delta cu and the δ cu ' of former high-tension motor and this motor stator pilot trench lead total sectional area respectively again:
δ cu=(2.1 * 4.1 * 2 strands and around * every coil 10 circles * every groove 2 coils)/(15 * 70)=0.328 is promptly less than 1/3;
δ cu '=(2.63 * 4.7 * 2 strands and around * every coil 8 circles * every groove 2 coils)/(15 * 70)=0.377 are promptly greater than 1/3.Be that this motor has improved 14.94% than former high-tension motor slot space utilance.The outer wrapping of coil 6 stratus master tapes still adopt the F class F insulation.
Calculate this rated current In ' according to (formula 6):
In′＝74A××4/1×(2.63×4.7×2)/(2.1×4.1×2)mm
2＝736A
Calculate new rated power Pn ' according to (formula 7):
Pn′＝630kW×690V/6000V×736A/74A＝720kW
The rated power of present embodiment motor contrasts the rated power 630kW of former high-tension motor, improves a power grade (surpassing JS standard series 700kW) at least.
Another modification scheme is, little in view of this stator coil sectional area of wire, space factor of winding Ks is also desirable 0.9, selects bifilar 3.05 * 5.1mm for use according to (formula 3)
2Single-glass silk bag electromagnetic wire and around, coil is wrapped up 4 stratus master tapes outward, still adopts the F class F insulation; Duty cycle, delta cu according to (formula 4) known former high-tension motor stator line of rabbet joint lead total sectional area is 0.328, the duty cycle, delta cu ' that calculates this motor stator line of rabbet joint lead total sectional area according to (formula 5) is 0.474 again, and back one scheme slot space utilance has improved 44.53% than former high-tension motor; Also improved 25.73% current density than last scheme and reduced to 90%, then the rated current In ' of this motor can increase to 736A * (3.05 * 5.1mm
2/ 2.63 * 4.7mm
2) * 0.9%=833A, this rated power Pn ' can reach 720kW * 833A/736A=815kW (surpass JS standard series 780kW), and then power grade of increase-volume at least again.
Fig. 2, the sectional view of conventional Stator of HV Electromotor single coil.
Fig. 3, the sectional view of the technical program stator winding single coil.Obviously, the latter has obviously reduced than the former insulating material duty ratio, and lead total sectional area duty ratio has then enlarged markedly.Duty ratio≤1/3 of known high-tension motor stator slot lead total sectional area, and this motor stator pilot trench lead total sectional area duty ratio＞1/3, the former can increase 10%～50% than the latter, has promptly increased 14.94%～44.53% as present embodiment.Keeping to improve 1～3 standard series power grade of its rated power under former high-tension motor magnetic flux density and the constant prerequisite of current density.Simultaneously, also can improve the ventilation condition in the machine behind the insulating material of the stator winding coil appropriateness attenuate, make cooling air volume (m in the machine
3/ s) increased about 20%, thus the operation temperature rise of motor reduced effectively.
Fig. 4, conventional high-tension winding type motor rotor winding connection structure figure.Its lead-out wire, slip ring and brush produce the pressure drop loss.
Fig. 5, the technical program changes high-tension winding type motor rotor winding into cagelike structure figure.Eradicated lead-out wire, slip ring and brush, and to install a sectional area additional at the root of internal rotor lead-out wire be to draw cross-sectional area copper short-circuited conducting sleeve doubly to weld, thereby change system into cage rotor.With its stator winding coil transformation common power of electric motor grade that improves that is complementary.
Fig. 6, Transformer Winding Y connection figure powered by conventional energy.
Fig. 7, the extend-triangle winding diagram that any side winding of the technical program isolating transformer T high-pressure side/low-pressure side can appropriate boost.Be used to allow the low pressure large-capacity transducer of voltage ripple of power network+10%, the step-up ratio of its step-up coil is preferably 5% of on-the-spot virtual voltage, has still reserved 5% line voltage upper limit undulating value; For the low pressure large-capacity transducer of allowing voltage ripple of power network+15%, the step-up ratio of its step-up coil is preferably 10% of on-the-spot virtual voltage, still reserves 5% line voltage upper limit undulating value.
The economic traits of the technical program
Contrast with present domestic and international high-tension motor frequency control product and technology thereof, have high power, high efficiency, High Power Factor, high reliability, low harmonic wave, low cost, low temperature rise, characteristics such as province's energy, province's raw material, morning taking effect, early recoup the investment.
(1) high power.Keep the high-tension motor magnetic flux density and current density is constant and the mechanical property admissible condition under, can improve 1～3 power grade of rated power.
(2) high efficiency.System effectiveness is greater than 96%.Wherein frequency converter efficient is 98%, and transformer efficiency is 98.8%, and the motor rated efficiency can improve 0.5～2 percentage point.
(3) High Power Factor.The system power factor can reach more than 0.95.
(4) high reliability.The one, adopting no conservator full-sealed transformer or dry-type transformer all is non-maintaining type; The 2nd, the low pressure large-capacity transducer of selected technology maturation is safe and reliable, is useful life 70000 hours; The 3rd, high-grade isolative motor is operated under the low-voltage variable frequency operating mode insulation life endless; The 4th, provide frequency conversion/power frequency diverter switch for oneself, breaking down in order to frequency converter switches to former power frequency pattern, and this switching device shifter neither increases cost, does not also increase floor space, no matter is converting operation or power frequency operation, and the rated power of motor all improves.
(5) low harmonic wave.The total harmonic wave of voltage can be lower than below 1.6%.Because the high/low pressure of this Transformer Winding both sides winding is taked discrete insulation isolation structure, high-pressure side or low-pressure side adopt the extend-triangle syndeton that has step-up coil, can isolate and absorb the high order harmonic component that produces in the conversion process effectively, add the absorption of the multichannel closed-loop path of motor, can significantly reduce the higher harmonic components of grid side, far below national standard limit value 4%.
(6) low cost.Used hermetically sealed no conservator transformer, universal low pressure large-capacity transducer and frequency conversion/power frequency low pressure diverter switch price are all lower, the transformation of the way expense of high-tension motor only original cost 40%, add and improved power grade, make every kW price be lower than 1000 yuan; And at present both at home and abroad high voltage frequency converter adds up-conversion/power frequency and switches high-tension switch cabinet, every kW price still up to 1200 yuan～more than 2000 yuan.
(7) low temperature rise.Usually during the high-tension motor power frequency operation, line voltage is often higher, causes the motor stator overexcitation and generates heat; Perhaps on the low side because of line voltage, cause the motor rotor slippage excessive and generate heat.The technical program one is to have realized the optimum Match of the voltage form of transformer, frequency converter and motor; The 2nd, with the reasonable attenuate of motor insulating material, make cooling air volume (m in the machine
3/ s) increase about 20%, thus motor operation temperature rise reduced effectively; The 3rd, increase-volume and not during increment of load, promptly be equivalent to reduce the current density operation will further prolong the useful life of motor.
(8) early take effect.As long as the transformer manufacturing is 15～20 days; Frequency converter is ordered goods only needs about 1 month; The motor transformation of the way is no more than 1 month; Control cubicle processing was no more than for 1 week; (comprise and lay low-voltage-powered cable and control shielded type cable, and need not beat again ground and change wheel) is installed about about 1 week, debugged and put into operation the same day same day.Total construction period (promptly taking effect the phase) only is about 1～February.
(9) early recoup the investment.Not only on-the-spot to transform (motor changes around stator winding) cost low, and grassroot project (motor adopts the new data coiling, can save restructuring cost and time) cost is lower, i.e. reduced investment, and instant effect, the investment payback time was about about 1～2 year.
(10) economize the energy.Microcosmic (separate unit) power saving rate of implementing the technical program is 30%～50%, nearly 40,000,000,000 kWh of macroscopic view (whole nation) Spring Festival holidays electric energy power.
(11) economize raw material.Adopt the technical program, can increase the rated capacity of frequency converter and motor on the one hand, also can save the steel of making high-tension motor, silicon steel sheet, insulating material etc. on the other hand.
This device technique specification:
Input voltage: 3 phase 3～10kV ± 5%;
Power output: 200～2000kW;
Increase-volume grade: 1～3 grade;
Output frequency: 0～55Hz;
Efficient: 〉=96%;
Power factor: 〉=0.95;
The total harmonic wave of voltage: less than 2% (standard GB/T14549-93 " quality of power supply utility network harmonic wave " limit value is 4%);
Start-up mode: frequency conversion soft start/power frequency decompression starting, the variable frequency starting electric current is lower than the motor rated current;
The converting operation pattern: frequency conversion/power frequency is switched, and manual control/automatic control is switched, and the multichannel frequency conversion is switched;
Control interface: be that PLC, IPC, DCS or the control of FCS system reserves analog and digital interface: 0 (4)～20mA, 0 (1)～5,0～10V; Digital control interface: RS485 communication interface and RS232 computer interface.
This device application
(1) air blast of power plant and cogeneration power plant (being forced draft fan), induced draft fan (being induced-draught fan), mill exhauster, water supply pump, circulating water pump, condensate pump, ash pump etc.
(2) the water-supply plant supply-water pump of metallurgy industry, tailings pump, converter and deduster induced draft fan, medium-and-large-sized oil transfer pump, medium-and-large-sized compressor etc.
(3) oil transfer pump of oil, chemical industry, water injection pump, supply-water pump, force (forcing) pump etc.
(4) the medium-and-large-sized supply-water pump of water supply industry.
(5) (suction) blower fan is drawn in the medium-and-large-sized cement plant of building material industry, large-scale stove draws (suction) blower fan etc.
(6) power-driven vessel of transportation industry and locomotive converter technique are transformed.
The technical scheme contrast sees Table 1-7:
Table 1. increasing volume type height-low-voltage variable frequency speed governing Integrated Solution and conventional height-low-high pressure scheme contrast
| Scheme | Motor rated power | Step-down transformer | The input reactance device | Step-up transformer | Output filter | System effectiveness (%) | System power factor (cos ) | The total harmonic wave of voltage (%) | Cost | Take effect the phase (moon) | Investment payback time (year) | Floor space | Fail safe |
| This height-low-pressure type | Can increase-volume 1-3 level | Rationally boost | All can have or not | Do not have | Need not | ≥95 | ≥0.94 | 0.6～1.6 | Very low | 1～2 | 1～2 | Less | Low-voltage safety |
| Domestic height-low-high-pressure type | Lower slightly | Step-down | Necessary | Common transformer | Necessary | Reduce with frequency | Reduce with frequency | Output≤5 | Higher | Longer | Longer | Very big | Keep Clear-High Voltage |
| External height-low-high-pressure type | Lower slightly | Step-down | Necessary | Amorphous transformer | Necessary | Reduce with frequency | Reduce with frequency | Output≤5 | Very high | Very long | Very long | Very big | Keep Clear-High Voltage |
Table 2. increasing volume type height-low-voltage variable frequency speed governing Integrated Solution and external height-middle pressure single tube scheme contrast
| Scheme | Motor rated power | Step-down transformer | The input reactance device | Output filter | Be suitable for line voltage (kV) | The total harmonic wave of voltage (%) | Cost | Take effect the phase (moon) | Investment is with the receipts phase (year) | Floor space | Fail safe |
| This height-low-pressure type | Can increase-volume 1-3 level | Rationally boost | Need not | Need not | 3～10 is any | 0.6～1.6 | Very low | 1～2 | 1～2 | Less | Low-voltage safety |
| External height-middle pressure single tube type | Lower slightly | Step-down | Necessary | Necessary | ≤4.16 | Higher | Very high | Very long | Very long | Very big | Middle pressure is dangerous |
Table 3. increasing volume type height-low-voltage variable frequency speed governing Integrated Solution and height-high-pressure multi-tube tandem plan contrast
| Scheme | Motor rated power | Transformer | The input reactance device | Output filter | Be suitable for line voltage (kV) | The total harmonic wave of voltage (%) | Cost | Take effect the phase (moon) | Investment payback time (year) | Floor space | Reliability | Fail safe |
| This height-low-pressure type | Can increase-volume 1-3 level | The electrical network isolation is rationally boosted | Need not | Need not | 3～10 is any | 0.6～1.6 | Very low | 1～2 | 1～2 | Less | Very high | Low-voltage safety |
| Domestic height-high-pressure series type | Lower slightly | The electrical network isolation voltage is constant | Necessary | Ignore | ≤6 | Higher | Higher | Longer | Longer | Bigger | Very poor | Keep Clear-High Voltage |
| External height-high-pressure series type | Lower slightly | The electrical network isolation voltage is constant | Necessary | Necessary | ≤6 | High slightly | Very high | Very long | Very long | Very big | Very poor | Keep Clear-High Voltage |
Table 4. increasing volume type height-low-voltage variable frequency speed governing Integrated Solution and the contrast of domestic and international multipleization scheme
| Scheme | Motor rated power | Step-down transformer | Low voltage frequency converter (platform) | System effectiveness (%) | The total harmonic wave of voltage (%) | Output frequency (Hz) | Cost | Take effect the phase (moon) | Investment payback time (year) | The maintenance amount | Probability of malfunction | Fail safe |
| This height-low-pressure type | Can increase-volume 1-3 level | But boosting efficiency height | 1～3 | ≥0.96 | 0.6～1.6 | ≥50 | Very low | 1～2 | 1～2 | Very little | Very little | Low-voltage safety |
| Domestic multipleization type | Lower slightly | Multipleization efficient is low | 15～30 | ≤0.94 | 1.1～1.4 | ≤50 | Higher | Longer | Longer | Very big | Very big | Keep Clear-High Voltage |
| External multipleization type | Lower slightly | Multipleization efficient is low | 15～30 | ≤0.94 | 1.1～1.3 | ≤50 | Very high | Very long | Very long | Very big | Very big | Keep Clear-High Voltage |
Table 5. increasing volume type height-low-voltage variable frequency speed governing Integrated Solution and the contrast of internal feedback scheme
| Scheme | Frequency converter | Starting mode | High-tension motor | Reactor | Efficient (%) | System power factor (cos ) | The total harmonic wave of voltage (%) | Speed adjustable range (%) | The inverter reliability | Cost | Ground | Take effect the phase (moon) | Safeguard | Environmental pollution |
| This height-low-pressure type | The third generation (IGBT) | Soft start | Transformation of the way increase-volume 1-3 level | Not essential | ≥0.96 | ≥0.94 | 1.1～1.6 | 0～150 | Very stable | Very low | Constant | 1～2 | Simply | Do not have |
| Internal feedback type | The first generation (SCR) | Frequently quick formula electric current is big | Change the not increase-volume of special coiling electric motor into | Necessary | ～0.9 | Generally≤0.6 copped wave≤0.85 adds electric capacity≤0.9 | ≥5 | 50～100 | Easily overturn | Quite | Beat again | ≥6 | The electric brush slip ring trouble | The brush dust noise |
Table 6. increasing volume type height-low-voltage variable frequency speed governing Integrated Solution and domestic and international conventional height-low pressure scheme contrast
| Scheme | Step-down transformer | Low-voltage cabinet | The input reactance device | Output filter | The total harmonic wave of voltage (%) | High-tension motor | Power of motor (kW) | Voltage matches | The electrical machine insulation grade | Cost | Take effect the phase (moon) | Investment payback time (year) | Ground | To wheel |
| This height-low-pressure type | Rationally boost | Need not | Need not | Need not | Input 0.6～1.6 | Transformation of the way increase-volume | 200～2000 increase-volume 1-3 levels | Optimum Match | Very high | Very low | 1～2 | 1～2 | Constant | Constant |
| Domestic height die mould | Reduce to standard low pressure | Necessary | Necessary | Ignore | Input～5 | Common low voltage motor | 200～500 rated power | Do not match | Very low | Lower | Long slightly | ≥4 | Beat again | Remake |
| External height die mould | Reduce to standard low pressure | Necessary | Necessary | Necessary | Output≤5 | The frequency conversion low voltage motor | 200～1500 rated power | Mate not good | Higher | Very high | Very long | ≥6 | Beat again | Remake |
Table 7. increasing volume type height-low-voltage variable frequency speed governing Integrated Solution with towards the height of high-tension motor-low-voltage variable frequency speed governing Integrated Solution contrast
| Scheme | Step-down transformer | The frequency converter rated capacity | High-tension motor rated power | Voltage matches | The electrical machine insulation grade | Cooling air volume (m 3/s) | Motor efficiency (%) |
| This height-low-pressure type | Improve nominal low-voltage 5%～10% | Can increase 5%～10% | Can increase 1～3 standard class | Optimum Match | Rationally high-grade | Improve about 20% | Improve 0.5～2 |
| Height-low-pressure type towards high-tension motor | ≤ nominal low-voltage | Do not increase | The under-voltage appearance that subtracts | Mate reluctantly | Cross high-grade | Constant | Constant |
Claims (4)
1, increasing volume type height-low-voltage variable frequency speed governing integrating device, by the transformer T that provides low pressure large-capacity transducer LF rationally to boost increase-volume, allow the low pressure large-capacity transducer LF of overvoltage 10%～15% operation, the increasing volume type low-voltage variable frequency adjustable-speed motor HM ' that utilizes common high-tension motor to form by its stator winding wiring construction of conversion and the transformation of the way of coil insulation structure, and low-voltage variable frequency/power frequency diverter switch Ct, Cf, Cw institute is integrated, it is characterized in that increasing volume type low-voltage variable frequency adjustable-speed motor HM ' employing high-tension motor core construction; Stator winding is pressed insulation system in adopting; Stator winding adopts the low pressure wiring construction; Low pressure large-capacity transducer LF adopts the input voltage compensation device.
2, increasing volume type height according to claim 1-low-voltage variable frequency speed governing integrating device, it is characterized in that increasing volume type low-voltage variable frequency adjustable-speed motor HM ', type groove structure adopt is opened in stator core, every groove lead total sectional area/groove window area be duty ratio greater than 1/3 until 1/2.
3, increasing volume type height according to claim 1-low-voltage variable frequency speed governing integrating device, the winding-type motor that it is characterized in that increasing volume type low-voltage variable frequency adjustable-speed motor HM ', remove slip ring and brush on the wound rotor, adding sectional area of weldering in its lead-out wire inside is to draw cross-sectional area copper short-circuited conducting sleeve doubly, change system into cage rotor, being complementary with the transformation of the way of stator winding coil increases the rated power of increasing volume type low-voltage variable frequency adjustable-speed motor HM ' jointly.
4, increasing volume type height according to claim 1-low-voltage variable frequency speed governing integrating device, it is characterized in that providing low pressure large-capacity transducer LF the transformer T of increase-volume that rationally boosts, adopt the extend-triangle winding that has step-up coil by transformer T high-pressure side or low-pressure side, rationally promote the specified input voltage 5%～10% of low pressure large-capacity transducer LF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100212529A CN1314197C (en) | 2004-04-09 | 2004-04-09 | Increasable capacity integrated installation of high-low voltage variable frequency speed control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100212529A CN1314197C (en) | 2004-04-09 | 2004-04-09 | Increasable capacity integrated installation of high-low voltage variable frequency speed control |
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| Publication Number | Publication Date |
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| CN1671036A CN1671036A (en) | 2005-09-21 |
| CN1314197C true CN1314197C (en) | 2007-05-02 |
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| CN103731085B (en) * | 2014-01-22 | 2016-11-23 | 鞍山市权晟电子电力有限公司 | Single-stage increasing volume type high pressure variable frequency speed regulating integrated device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044742A (en) * | 1989-01-31 | 1990-08-15 | 周元华 | Permanent-magnet capacity-boosting electric motor |
| CN2062918U (en) * | 1989-09-25 | 1990-09-26 | 刘铁军 | Capacity extender for ac ups |
| US6570361B1 (en) * | 1999-02-22 | 2003-05-27 | Borealis Technical Limited | Rotating induction apparatus |
| CN2579078Y (en) * | 2002-07-16 | 2003-10-08 | 吕志斗 | High-low voltage frequency conversion speed adjustable integrated device for high-voltage motor |
-
2004
- 2004-04-09 CN CNB2004100212529A patent/CN1314197C/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044742A (en) * | 1989-01-31 | 1990-08-15 | 周元华 | Permanent-magnet capacity-boosting electric motor |
| CN2062918U (en) * | 1989-09-25 | 1990-09-26 | 刘铁军 | Capacity extender for ac ups |
| US6570361B1 (en) * | 1999-02-22 | 2003-05-27 | Borealis Technical Limited | Rotating induction apparatus |
| CN2579078Y (en) * | 2002-07-16 | 2003-10-08 | 吕志斗 | High-low voltage frequency conversion speed adjustable integrated device for high-voltage motor |
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| CN1671036A (en) | 2005-09-21 |
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