CN101403784A - AC frequency conversion resonance vibration pressure-proof novel method for AC motor stator winding - Google Patents
AC frequency conversion resonance vibration pressure-proof novel method for AC motor stator winding Download PDFInfo
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- CN101403784A CN101403784A CNA2008102288304A CN200810228830A CN101403784A CN 101403784 A CN101403784 A CN 101403784A CN A2008102288304 A CNA2008102288304 A CN A2008102288304A CN 200810228830 A CN200810228830 A CN 200810228830A CN 101403784 A CN101403784 A CN 101403784A
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- frequency conversion
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Abstract
The invention relates to a new AC frequency-conversion resonance pressure-proof method which is applied to an AC motor stator winding. The method comprises the following steps: a crosslinked cable which is connected with an AC motor to be tested is taken as a compensation capacitor; the direct earth capacitance of the crosslinked cable is measured; the required inductance value during the power frequency resonance is calculated; the inductance of an AC frequency-conversion resonance pressure-proof testing device is selected; and then an unearthed core wire in a cable and a winding to the tested of the AC motor are connected together. The invention has the advantages of simple and convenient operation, lower cost, high working efficiency and basically no damage to an object to be tested.
Description
Technical field
The present invention relates to a kind of AC frequency conversion resonance vibration pressure-proof novel method that is applied to the AC motor stator winding.
Background technology
AC frequency conversion resonance vibration pressure-proof is a new technology that is applied in recent years in the crosslinked cable test, replacing direct current sews withstand voltage the time, also be applied to gradually and test the field widely, in the handing-over withstand voltage test as perceptual tested things (ground capacitance is very little) such as motor, transformers.But when being applied to above tested thing, as motor, during transformer etc. because its electric capacity is very little, can not or be not enough to test unit in reactor near power frequency (45hz-65hz), produce LC resonance.So need building-out capacitor, and the size of building-out capacitor changes along with the difference of the electric capacity of tested thing, building-out capacitor is excessive can to increase cost again.
Summary of the invention
The purpose of this invention is to provide a kind of easy and simple to handle, cost is lower, high efficiency and to the undamaged substantially AC frequency conversion resonance vibration pressure-proof novel method that is applied to AC motor of tested thing.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of AC frequency conversion resonance vibration pressure-proof novel method that is applied to AC motor, this method is with the crosslinked cable that connects tested AC motor electric capacity by way of compensation, measure the crosslinked cable ground capacitance, calculating required inductance value when industrial frequency resonance, choose the inductance of AC frequency conversion resonance vibration pressure-proof test unit, the tested winding with unearthed heart yearn and AC motor in the cable links together then.
Described AC frequency conversion resonance vibration pressure-proof testing equipment is made up of frequency conversion voltage adjusting power supply, driver transformer, combination type reactor, capacitive divider, the frequency conversion voltage adjusting power supply connects driver transformer, the driver transformer other end connects reactor, the reactor output terminal connects unearthed heart yearn in capacitive divider and motor stator winding and the crosslinked cable, and the capacitive divider other end is connected to frequency conversion voltage adjusting power operation case and makes the voltage measurement feedback.
Compared with prior art, the invention has the beneficial effects as follows:
Simple in structure, cost is low, high efficiency.According to test specification, 10kv crosslinked cable withstand voltage is 2 times of specified phase voltages, is generally 17.4kv five minutes, and the withstand voltage standard of 10kv asynchronous machine stator winding commonly used is 16kv one minute, so can not cause damage to cable.And tested thing is in process of the test as when the insulation breakdown phenomenon takes place, and condition of resonance destroys and lowers trial voltage fast, thereby avoids tested thing is caused damage.
Description of drawings
Fig. 1 is the field wiring synoptic diagram of the inventive method.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment:
See Fig. 1, earlier the AC frequency conversion resonance vibration pressure-proof testing equipment be placed on by the tested AC motor that the AC frequency conversion resonance vibration pressure-proof testing equipment is made up of frequency conversion voltage adjusting power supply, driver transformer, reactor, capacitive divider.Wherein two cores of cable are connected with ground, and another core is connected with the AC motor stator winding.The other end of cable (electric substation's one end) need someone be held and keep, and unsettled and three-phase separately with the heart yearn of cable.AC electrical machine stator ground capacitance and cable earth capacitance parallel connection, the value of shunt capacitance over the ground of measurement cable and motor stator is according to formula
Calculating required inductance value when industrial frequency resonance is chosen the reactor of AC frequency conversion resonance vibration pressure-proof test unit then, and the series and parallel by reactor connects and reaches required inductance value.Receive on the motor stator winding, as shown in Figure 1 after reactor connect dividing potential drop electric capacity.Operation resonance pressure-resistant test unit finds resonant frequency point, and 16KV, one minute are pressed in the additional examination electrical verification.
Example: at certain coking engineering projects scene, be equipped with coal workshop section, have several comminutor motors to install, electric pressure is 10KV, and motor cable has been laid and put in place, is twisted polyethylene cable, and cable end is finished, waits for and does commissioning test.
With reference to top embodiment, at first, measure motor stator winding (three-phase) ground capacitance with capacitance meter 200PF shelves, its capacitance is 16PF, measures the electric cable capacitance value again, is 0.09 μ F, motor electric capacity and electric cable capacitance parallel connection, then total capacitance is 16PF+0.09 μ F.What testing equipment adopted is that Changchun light reaches the CGS variable-frequency series-resonance test unit that instrument and meter company limited produces, and has 5 joint reactors, and single-unit reactor inductance amount is 95H.The hypothesis resonance frequency is 45HZ earlier, calculates required inductance, according to formula
Get L=136H; Suppose that resonance frequency is 65HZ, calculate required inductance, get L=66H;
Calculate as can be known by this, can realize resonance by the connection in series-parallel reactor near power frequency, because of single-unit reactor inductance amount is 95H, then straightforward procedure is for using the single-unit reactor, and then calculating resonance frequency is 54HZ.With reference to reference to top embodiment, can finish this test.
Claims (2)
1, a kind of AC frequency conversion resonance vibration pressure-proof novel method that is applied to AC motor, it is characterized in that, this method is with the crosslinked cable that connects tested AC motor electric capacity by way of compensation, measure the crosslinked cable ground capacitance, calculating required inductance value when industrial frequency resonance, choose the inductance of AC frequency conversion resonance vibration pressure-proof test unit, the tested winding with unearthed heart yearn and AC motor in the cable links together then.
2, a kind of AC frequency conversion resonance vibration pressure-proof novel method that is applied to the AC motor stator winding according to claim 1, it is characterized in that, described AC frequency conversion resonance vibration pressure-proof testing equipment is by the frequency conversion voltage adjusting power supply, driver transformer, combination type reactor, capacitive divider is formed, the frequency conversion voltage adjusting power supply connects driver transformer, the driver transformer other end connects reactor, the reactor output terminal connects unearthed heart yearn in capacitive divider and motor stator winding and the crosslinked cable, and the capacitive divider other end is connected to frequency conversion voltage adjusting power operation case and makes the voltage measurement feedback.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102288304A CN101403784B (en) | 2008-11-17 | 2008-11-17 | AC frequency conversion resonance vibration pressure-proof device for AC motor stator winding, and method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102288304A CN101403784B (en) | 2008-11-17 | 2008-11-17 | AC frequency conversion resonance vibration pressure-proof device for AC motor stator winding, and method therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101403784A true CN101403784A (en) | 2009-04-08 |
| CN101403784B CN101403784B (en) | 2011-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008102288304A Active CN101403784B (en) | 2008-11-17 | 2008-11-17 | AC frequency conversion resonance vibration pressure-proof device for AC motor stator winding, and method therefor |
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| CN (1) | CN101403784B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818977A (en) * | 2012-08-24 | 2012-12-12 | 南京思能电气有限公司 | Industrial frequency resonance voltage resistance test container system for electric power equipment |
| CN104422857A (en) * | 2013-08-27 | 2015-03-18 | 青岛菲特电器科技有限公司 | 110 KV vehicle-mounted magnetic power frequency resonance test transformer and working method thereof |
| CN104459501A (en) * | 2014-12-25 | 2015-03-25 | 中国西电电气股份有限公司 | Lightning arrester power frequency testing device and method |
| CN107783016A (en) * | 2017-10-02 | 2018-03-09 | 国网山西省电力公司电力科学研究院 | Multiphase Parallel completes the measuring method of GIS pressure tests before transformer station puts into operation |
| CN108508338A (en) * | 2018-03-01 | 2018-09-07 | 武汉拓普联合电力设备有限公司 | Frequency conversion resonance experiment device |
| CN111751679A (en) * | 2020-06-09 | 2020-10-09 | 中国长江电力股份有限公司 | Alternating current voltage withstand test device and method for upper-layer wire rods of stator of hydraulic generator |
-
2008
- 2008-11-17 CN CN2008102288304A patent/CN101403784B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818977A (en) * | 2012-08-24 | 2012-12-12 | 南京思能电气有限公司 | Industrial frequency resonance voltage resistance test container system for electric power equipment |
| CN104422857A (en) * | 2013-08-27 | 2015-03-18 | 青岛菲特电器科技有限公司 | 110 KV vehicle-mounted magnetic power frequency resonance test transformer and working method thereof |
| CN104459501A (en) * | 2014-12-25 | 2015-03-25 | 中国西电电气股份有限公司 | Lightning arrester power frequency testing device and method |
| CN107783016A (en) * | 2017-10-02 | 2018-03-09 | 国网山西省电力公司电力科学研究院 | Multiphase Parallel completes the measuring method of GIS pressure tests before transformer station puts into operation |
| CN107783016B (en) * | 2017-10-02 | 2019-11-05 | 国网山西省电力公司电力科学研究院 | Multiphase Parallel completes the measuring method of GIS pressure test before substation puts into operation |
| CN108508338A (en) * | 2018-03-01 | 2018-09-07 | 武汉拓普联合电力设备有限公司 | Frequency conversion resonance experiment device |
| CN111751679A (en) * | 2020-06-09 | 2020-10-09 | 中国长江电力股份有限公司 | Alternating current voltage withstand test device and method for upper-layer wire rods of stator of hydraulic generator |
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| CN101403784B (en) | 2011-03-23 |
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Owner name: CHINA THIRD METALLURGICAL GROUP CO., LTD. Free format text: FORMER OWNER: ELECTRICAL INSTALLATION ENGINEERING COMPANY, MCC NORTHEAST CONSTRUCTION CO., LTD. Effective date: 20140710 |
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Free format text: CORRECT: ADDRESS; FROM: 114001 ANSHAN, LIAONING PROVINCE TO: 114039 ANSHAN, LIAONING PROVINCE |
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Effective date of registration: 20140710 Address after: 114039 Anshan province Liaoning City Mountain Road No. 105 building materials Patentee after: CHINA THREE METALLURGICAL GROUP CO., LTD. Address before: 114001, Iron East Street, Anshan, Liaoning Province, No. 8, furnace Street Patentee before: Electrical Installation Engineering Co. of MCC Northeast Construction Co., Ltd. |