CN204244087U - A kind of motor test electric supply installation with transformer and filter - Google Patents

A kind of motor test electric supply installation with transformer and filter Download PDF

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Publication number
CN204244087U
CN204244087U CN201420783585.4U CN201420783585U CN204244087U CN 204244087 U CN204244087 U CN 204244087U CN 201420783585 U CN201420783585 U CN 201420783585U CN 204244087 U CN204244087 U CN 204244087U
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China
Prior art keywords
test
frequency
filter
transformer
motor
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CN201420783585.4U
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Chinese (zh)
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党浩
殷强
张乐
巩怀勇
李小满
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CSR Zhuzhou Electric Co Ltd
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CSR Zhuzhou Electric Co Ltd
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Abstract

A kind of motor test electric supply installation with transformer and filter, circuit is provided with electrical network access switch, frequency conversion main path switch, frequency conversion branch switch, power frequency branch switch, separating or the required circuit element of closure state access test by control switch, between frequency converter and motor, be connected with filter and transformer.The utility model can reduce power supply capacity, thus reduces the requirement of test to equipment, reduces expense, avoids the big current that produces during electric motor starting and vibrations and the infringement to equipment, the useful life of extension device.

Description

A kind of motor test electric supply installation with transformer and filter
Technical field
The utility model relates to the electric supply installation carrying out motor test, is specifically related to the traction electric machine test electric supply installation being with transformer and filter.
Background technology
When traction electric machine carries out checking experiment, need to carry out locked rotor test, no-load test, vibration test, noise test, the test of speed probe output waveform and the project such as coil heats, bearing temperature rise test.Traditional testing equipment many employings test unit, this kind equipment can realize output voltage and frequency-adjustable, although the test demand of traction electric machine can be met, but because the unit of indoor location is generally generated electricity by motor run generator operation, limit by motor starting characteristic, the power supply capacity that this kind of testing equipment needs electrical network to provide very large at start-up period, only after spending this one-phase, power load just can drop to the normal level of tested traction electric machine test demand.Meanwhile, this kind of equipment build is huge, expensive, complex structure, and efficiency is lower, the time-consuming effort of working service.Such as: certain traction electric machine Maintenance Bases limits by site condition, and power supply capacity is only 400kVA.If service test unit is tested the carrying out of traction electric machine, the minimal power capacity required for start-up period also wants 700kVA, and the short-time overload of degree like this obviously cannot accept, so use the scheme that power supply capacity is 400kVA test unit to realize.
If adopt frequency converter be power supply directly to feeding electric motors, and by the supply power mode that electric current, voltage and frequency increase gradually from 0, although can significantly to reduce the requirement of power supply capacity.But when carrying out locked rotor test, due to locked rotor test it is desirable that low-voltage and big current, directly frequency converter being connected with motor, usually can having a strong impact on the result of the test excessive damage motor that even causes that the motor feels hot because Harmonic Current Distortion is excessive.And time row no-load test time, due to no-load test it is desirable that high voltage and small area analysis, directly frequency converter is connected with motor, the high voltage needed when being difficult to reach no-load test, if now only add a transformer in frequency converter and motor, then easily produce more Harmonic Current Distortion again.
For solving the problem, the utility model discloses and a kind ofly using low voltage frequency converter to be power supply, selecting the different branch of collocation sinusoidal current wave filter and transformer to carry out a kind of device of powering for traction electric machine test by arranging switch.Adopt this device to carry out traction electric machine test, power supply capacity requirement is only to 1/7 of traditional experiment unit mode, this apparatus structure is comparatively simple, and operation and maintenance is very convenient.
Find that following patent and the utility model have similarity by domestic retrieval:
Application number is 200880119691.X, the patent of invention that name is called " device for testing transformers ", and this disclosure of the invention one has the equipment for testing transformer of static frequency converter (2).Static frequency converter (2) has multiple output (21,22,23) being connected to filter (6).Filter (6) also has multiple output (31,32,33) being connected to matching transformer (8), and matching transformer (8) is connected with the transformer (15) for testing.Filter (6) is filter transformer B (11).
The utility model and application number are that the main difference of the patent of invention of 200880119691.X is: the current filter be made up of inductance that the utility model adopts, its topmost effect is elimination Harmonic Current Distortion, prevents from occurring a large amount of Harmonic Current Distortion in locked rotor test process and has a strong impact on the result of the test excessive damage motor that even causes that the motor feels hot.And the patent of invention that application number is 200880119691.X adopts connects into by electric capacity (C1, C2, C3) the voltage wave filter that star form, its Main Function is the transformer (15) preventing asymmetric interference arrival tested person.
Another similar patent is: application number is 201110421282.9, the patent of invention that name is called " a kind of high-voltage motor testing method of supplying power to and device ".This disclosure of the invention a kind of high-voltage motor testing method of supplying power to and device, each circuit element branch road arranges switch, and by controlling the state of each switch, on mains supply line, optionally required circuit element is tested in access, form the required enough supply lines of test, motor test is powered.This invention can need adjustment supply line and electric pressure flexibly according to test, meets different test demands.
Application number be 201110421282.9 patent of invention mainly switch is set on each circuit element branch road, by controlling the state of each switch, on mains supply line, optionally required circuit element is tested in access, forms the required enough supply lines of test, powers to motor test.Make adjust supply line and electric pressure flexibly, meet different test demands.And the utility model is mainly by connecting current filter and transformer at inverter output terminal, both played while significantly reducing power supply capacity and also can high voltage be provided for test and a large amount of Harmonic Current Distortion can be filtered out.
Utility model content
The technical problems to be solved in the utility model is:
1. how to reduce power supply capacity, thus reduce the requirement of test to equipment, reduce expense;
2. the infringement that the big current produced when how to reduce electric motor starting and vibrations cause circuit element;
3. how to make frequency converter output voltage significantly to raise, meet no-load test needs;
4. how to reduce a large amount of Harmonic Current Distortion that the direct connection transformer of inverter output terminal produces;
5. how to realize needing to select supply line flexibly according to test, meet the test needs of traction electric machine disparity items.
Pin is with the problems referred to above, the technical scheme that the utility model proposes is: a kind of motor test electric supply installation with transformer and filter, circuit is provided with electrical network access switch, frequency conversion main path switch, frequency conversion branch switch, power frequency branch switch, separating or the required circuit element of closure state access test by control switch, between frequency converter and motor, be connected with filter and transformer.
Further, closed electrical network access switch, frequency conversion main path switch, power frequency branch switch, separately frequency conversion branch switch, makes frequency converter, filter, transformer be connected successively with motor, forms industrial frequency experiment supply line.
Further, described industrial frequency experiment supply line is powered to the locked rotor test of motor and no-load test by filter and transformer for frequency converter.
Further, filter is current filter, and filter carries out filtering to the output current of frequency converter; Make when the frequency of frequency converter is 50Hz, its total Harmonic Current Distortion rate THDi≤3%; When the frequency of frequency converter is more than or equal to 40Hz and is less than or equal to 60Hz, its total Harmonic Current Distortion rate THDi≤10%.
Further, transformer can switch at 200V shelves, 1500V shelves and 3000V shelves, and power-frequency voltage is increased to the voltage request that 1500V shelves or 3000V shelves meet no-load test by transformer; Power-frequency voltage is reduced to voltage request when 200V shelves meet locked rotor test.
Further, closed electrical network access switch, frequency conversion main path switch, frequency conversion branch switch, separately power frequency branch switch, makes frequency converter and motor straight connect in succession, forms frequency conversion test supply line.
Further, described frequency conversion test supply line is used for frequency converter and powers to the vibration test of motor, noise test, overspeed test, the test of speed probe output waveform and coil heats and bearing temperature rise test.
Further, when frequency converter is to the vibration test of motor, noise test, overspeed test, the test of speed probe output waveform and coil heats and bearing temperature rise test, the voltage of employing is 380V.
Further, the supply power mode of frequency converter to motor is mode electric current, voltage and frequency increased gradually from 0, and the voltage of frequency converter and frequency can independently adjust.
The utility model has the advantages that:
1. significantly reduce power supply capacity, power supply capacity demand is only 1/7 of unit, thus reduces the requirement of test to equipment, the expense produced when significantly reducing equipment cost and test;
2. make frequency converter output voltage significantly to raise, no-load test needs can be met;
3. can reduce a large amount of Harmonic Current Distortion that the direct connection transformer of inverter output terminal produces;
4. can realize needing to select supply line flexibly according to test, meet the test needs of traction electric machine disparity items;
5. whole device is compared with unit, and volume significantly reduces and without spin and moving component, occupied ground is little;
6. structure is simple, and operation and maintenance is very convenient, noise-less pollution and dust emission;
7. can avoid the big current that produces during electric motor starting and vibrations and the infringement to equipment, the useful life of extension device.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model;
Fig. 2 is circuit theory schematic diagram of the present utility model;
In figure: 1 electrical network access switch, 11 fast acting fuses, 12 smoothing reactors, 2 frequency converters, 3 frequency conversion main path switches, 4 filters, 5 frequency conversion branch switchs, 6 transformers, 7 power frequency branch switchs, 8 traction electric machines.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the description of one step is done to the utility model:
Embodiment one
As shown in Figure 1, between electrical network access switch and frequency converter, be connected with fast acting fuse and smoothing reactor in turn, fast acting fuse can play the effect of protection frequency converter by open circuit immediately when the electric current of circuit is excessive.Because the voltage of the power supply accessed from electrical network is always ripply, in connection, smoothing reactor is exactly to allow from the power supply of electrical network access closer to ideal source, reducing the harmful effect that produces various motor test of power supply.
As depicted in figs. 1 and 2, when carrying out locked rotor test and no-load test to motor, closed electrical network access switch, frequency conversion main path switch, power frequency branch switch, separately frequency conversion branch switch, frequency converter, filter, transformer are connected successively with traction electric machine, form industrial frequency experiment supply line.Soft start function due to frequency converter can make starting current, voltage and frequency all start from scratch, therefore alleviate the impact of electrical network and the requirement to power supply capacity, adopt this device to carry out traction electric machine test, power supply capacity requirement is only to 1/7 of traditional experiment unit mode.
When carrying out locked rotor test to motor, due to locked rotor test it is desirable that low-voltage and big current, but the voltage of electrical network is 380V, is directly used in locked rotor test effect undesirable, in order to obtain larger test current, need output voltage to reduce when power supply capacity is certain.What the present embodiment adopted is connection transformer and traction electric machine successively after frequency converter and filter, and described transformer can switch at 200V shelves, 1500V shelves and 3000V shelves.When carrying out locked rotor test, transformer is adjusted to 200V shelves, larger test current can be obtained.In order to avoid, Harmonic Current Distortion is excessive has a strong impact on the result of the test excessive damage motor that even causes that the motor feels hot, what the present embodiment adopted is the current filter be made up of inductance be connected between frequency converter with traction electric machine as shown in Figure 1, suppresses Harmonic Current Distortion.
When carrying out no-load test to motor, the connection of circuit be identical when carrying out locked rotor test.Due to no-load test it is desirable that high voltage and small area analysis, but the voltage of electrical network is 380V, is not suitable for being directly used in no-load test.Therefore according to the traction electric machine of different model, transformer is adjusted to 1500V shelves or 3000V shelves, now transformer raising voltage effect, filter plays a part to prevent Harmonic Current Distortion, and frequency converter is still and adopts soft starting mode to reduce requirement to power supply capacity.
Because filter has at certain Frequency point filter effect best, all the other Frequency point filter effects can differ from a little features.The filter adopted in the present embodiment is that effect is best when the frequency of frequency converter is 50Hz, its total Harmonic Current Distortion rate THDi≤3%.And when the frequency of frequency converter is more than or equal to 40Hz and is less than or equal to 60Hz, its total Harmonic Current Distortion rate THDi≤10%.Therefore, the locked rotor test of the traction electric machine in the present embodiment and no-load test are mainly carried out under the frequency of 50Hz.
As depicted in figs. 1 and 2, when vibration test, noise test, overspeed test, the test of speed probe output waveform and coil heats and bearing temperature rise test are carried out to traction electric machine, closed electrical network access switch, frequency conversion main path switch, frequency conversion branch switch, separately power frequency branch switch, frequency converter and motor straight are connect in succession, forms frequency conversion test supply line.
Because the vibration test of traction electric machine, noise test, overspeed test, the test of speed probe output waveform and coil heats and bearing temperature rise test are to the special requirement of voltage and current, so the 380V voltage on electrical network directly can be adopted when carrying out this series of experiments, therefore transformer and filter can not be connect.But the capacity requirement of hard reboot to electrical network due to motor is too high and can cause serious impact to electrical network, the big current produced during startup and vibrations can cause damage to circuit element, totally unfavorable to the useful life of equipment, so still need to adopt frequency converter to be started by all zero-based to electric current, voltage and frequency soft starting mode.
Frequency converter is provided with FREQUENCY CONTROL, vector control, V/F and controls three kinds of modes respectively, and when using V/F to control respectively, output voltage and frequency can independently regulate separately, to meet the different pilot project demand of traction electric machine.
Obviously, under the prerequisite not departing from principle described in the utility model, the some improvement made or modification all should be considered as protection range of the present utility model.

Claims (9)

1. the motor test electric supply installation with transformer and filter, circuit is provided with electrical network access switch, frequency conversion main path switch, frequency conversion branch switch, power frequency branch switch, separating or the required circuit element of closure state access test by control switch, it is characterized in that, between frequency converter and motor, be connected with filter and transformer.
2. a kind of motor test electric supply installation with transformer and filter according to claim 1, it is characterized in that, closed electrical network access switch, frequency conversion main path switch, power frequency branch switch, separately frequency conversion branch switch, frequency converter, filter, transformer are connected successively with motor, form industrial frequency experiment supply line.
3. a kind of motor test electric supply installation with transformer and filter according to claim 2, is characterized in that, described industrial frequency experiment supply line is used for frequency converter and is powered to the locked rotor test of motor and no-load test by filter and transformer.
4. a kind of motor test electric supply installation with transformer and filter according to claim 3, it is characterized in that, filter is current filter, and filter carries out filtering to the output current of frequency converter; Make when the frequency of frequency converter is 50Hz, its total Harmonic Current Distortion rate THDi≤3%; When the frequency of frequency converter is more than or equal to 40Hz and is less than or equal to 60Hz, its total Harmonic Current Distortion rate THDi≤10%.
5. a kind of motor test electric supply installation with transformer and filter according to claim 3, it is characterized in that, transformer can switch at 200V shelves, 1500V shelves and 3000V shelves, and power-frequency voltage is increased to the voltage request that 1500V shelves or 3000V shelves meet no-load test by transformer; Power-frequency voltage is reduced to voltage request when 200V shelves meet locked rotor test.
6. a kind of motor test electric supply installation with transformer and filter according to claim 1, it is characterized in that, closed electrical network access switch, frequency conversion main path switch, frequency conversion branch switch, separately power frequency branch switch, frequency converter and motor straight are connect in succession, forms frequency conversion test supply line.
7. a kind of motor test electric supply installation with transformer and filter according to claim 6, it is characterized in that, described frequency conversion test supply line is used for frequency converter and powers to the vibration test of motor, noise test, overspeed test, the test of speed probe output waveform and coil heats and bearing temperature rise test.
8. a kind of motor test electric supply installation with transformer and filter according to claim 7, it is characterized in that, when frequency converter is to the vibration test of motor, noise test, overspeed test, the test of speed probe output waveform and coil heats and bearing temperature rise test, the voltage of employing is 380V.
9. a kind of motor test electric supply installation with transformer and filter according to claim 1, it is characterized in that, the supply power mode of frequency converter to motor is mode electric current, voltage and frequency increased gradually from 0, and the voltage of frequency converter and frequency can independently adjust.
CN201420783585.4U 2014-12-12 2014-12-12 A kind of motor test electric supply installation with transformer and filter Active CN204244087U (en)

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Application Number Priority Date Filing Date Title
CN201420783585.4U CN204244087U (en) 2014-12-12 2014-12-12 A kind of motor test electric supply installation with transformer and filter

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104377967A (en) * 2014-12-12 2015-02-25 南车株洲电机有限公司 Motor testing power supply method and device employing transformer and filter
CN106124987A (en) * 2016-06-22 2016-11-16 福建惠丰电机有限公司 A kind of alternating current generator locked rotor test power supply expansion method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104377967A (en) * 2014-12-12 2015-02-25 南车株洲电机有限公司 Motor testing power supply method and device employing transformer and filter
CN106124987A (en) * 2016-06-22 2016-11-16 福建惠丰电机有限公司 A kind of alternating current generator locked rotor test power supply expansion method

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