CN201298061Y - Alternating-current frequency conversion resonant vibration overpressure resistant device - Google Patents
Alternating-current frequency conversion resonant vibration overpressure resistant device Download PDFInfo
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- CN201298061Y CN201298061Y CNU2008202192222U CN200820219222U CN201298061Y CN 201298061 Y CN201298061 Y CN 201298061Y CN U2008202192222 U CNU2008202192222 U CN U2008202192222U CN 200820219222 U CN200820219222 U CN 200820219222U CN 201298061 Y CN201298061 Y CN 201298061Y
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- frequency conversion
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- resonance vibration
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Abstract
The utility model relates to an alternating-current frequency conversion resonant vibration overpressure resistant device applied to a stator winding of an ac electric motor, the alternating-current frequency conversion resonant vibration overpressure resistant device is composed of an alternating-current frequency conversion resonant vibration overpressure resistant test equipment and a crosslinking electrical cables, two cores of the crosslinking electrical cables are connected with the ground, another core is connected with the stator winding of the ac electric motor. The utility model has the advantages of simple and convenient operation, low cost, high work efficiency, and nearly non-damage to the subject to be tested.
Description
Technical field
The utility model relates to a kind of device that is applied to the AC frequency conversion resonance vibration pressure-proof of 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 (the generation LC resonance 45hz-65hz).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 utility model provide a kind of easy and simple to handle, cost is lower, high efficiency and to the undamaged substantially employing crosslinked cable of the tested thing AC frequency conversion resonance vibration pressure-proof device of electric capacity by way of compensation.
For achieving the above object, the utility model is achieved through the following technical solutions:
Adopt the crosslinked cable AC frequency conversion resonance vibration pressure-proof device of electric capacity by way of compensation, this device is made of AC frequency conversion resonance vibration pressure-proof testing equipment and crosslinked cable, and wherein two cores of crosslinked cable are connected with ground, and another core is connected with the AC motor stator winding.
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 beneficial effects of the utility model are:
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 this device.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further:
See Fig. 1, adopt the crosslinked cable AC frequency conversion resonance vibration pressure-proof device of electric capacity by way of compensation, this device is made of AC frequency conversion resonance vibration pressure-proof testing equipment and crosslinked cable, and wherein two cores of crosslinked cable are connected with ground, and another core is connected with the AC motor stator winding.
Adopt the method for the AC frequency conversion resonance vibration pressure-proof of this device to test AC motor to be:
With the crosslinked cable that connects tested AC motor electric capacity by way of compensation, measure cable earth 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.
The AC frequency conversion resonance vibration pressure-proof testing equipment is placed on by the tested AC motor earlier, the 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 cable, and the capacitive divider other end is connected to frequency conversion voltage adjusting power operation case and makes the voltage measurement feedback.Wherein two cores of crosslinked cable are connected with ground, and another core is connected with the AC motor stator winding.The other end of crosslinked 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.Finish for example.
Claims (2)
1, a kind of AC frequency conversion resonance vibration pressure-proof device that is applied to the AC motor stator winding, it is characterized in that, this device is made of AC frequency conversion resonance vibration pressure-proof testing equipment and crosslinked cable, and wherein two cores of crosslinked cable are connected with ground, and another core is connected with the AC motor stator winding.
2, a kind of AC frequency conversion resonance vibration pressure-proof device 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 |
|---|---|---|---|
| CNU2008202192222U CN201298061Y (en) | 2008-11-17 | 2008-11-17 | Alternating-current frequency conversion resonant vibration overpressure resistant device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202192222U CN201298061Y (en) | 2008-11-17 | 2008-11-17 | Alternating-current frequency conversion resonant vibration overpressure resistant device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201298061Y true CN201298061Y (en) | 2009-08-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202192222U Expired - Fee Related CN201298061Y (en) | 2008-11-17 | 2008-11-17 | Alternating-current frequency conversion resonant vibration overpressure resistant device |
Country Status (1)
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| CN (1) | CN201298061Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389442A (en) * | 2012-05-07 | 2013-11-13 | 四川聚友生态农业科技有限公司 | Transformer substation electrical device alternating current withstand voltage resonance testing device |
| CN104849638A (en) * | 2015-06-09 | 2015-08-19 | 国电大渡河检修安装有限公司 | Series-resonance withstand voltage testing device of frequency modulation and inductance adjustment type, and design method therefor |
| CN106597234A (en) * | 2016-12-09 | 2017-04-26 | 广西电友科技发展有限公司 | Parallel elementary-error compensation power-frequency voltage-withstand test method |
| CN106771911A (en) * | 2016-12-09 | 2017-05-31 | 广西电友科技发展有限公司 | A kind of elementary errors compensation industrial frequency withstand voltage experimental rig in parallel |
| CN111220886A (en) * | 2019-11-29 | 2020-06-02 | 山东送变电工程有限公司 | Novel assembled series resonance alternating current voltage withstand equipment |
| CN111596149A (en) * | 2020-04-23 | 2020-08-28 | 国网湖南省电力有限公司 | High-voltage test device for power transmission line and high-voltage shunt reactor and application method thereof |
| CN113447778A (en) * | 2021-06-29 | 2021-09-28 | 国网陕西省电力公司电力科学研究院 | Method for performing high-resistance induction withstand voltage and partial discharge test by using circuit |
-
2008
- 2008-11-17 CN CNU2008202192222U patent/CN201298061Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389442A (en) * | 2012-05-07 | 2013-11-13 | 四川聚友生态农业科技有限公司 | Transformer substation electrical device alternating current withstand voltage resonance testing device |
| CN104849638A (en) * | 2015-06-09 | 2015-08-19 | 国电大渡河检修安装有限公司 | Series-resonance withstand voltage testing device of frequency modulation and inductance adjustment type, and design method therefor |
| CN104849638B (en) * | 2015-06-09 | 2017-12-08 | 国电大渡河检修安装有限公司 | Frequency modulation induction-regulated series resonance pressure test apparatus and its design method |
| CN106597234A (en) * | 2016-12-09 | 2017-04-26 | 广西电友科技发展有限公司 | Parallel elementary-error compensation power-frequency voltage-withstand test method |
| CN106771911A (en) * | 2016-12-09 | 2017-05-31 | 广西电友科技发展有限公司 | A kind of elementary errors compensation industrial frequency withstand voltage experimental rig in parallel |
| CN111220886A (en) * | 2019-11-29 | 2020-06-02 | 山东送变电工程有限公司 | Novel assembled series resonance alternating current voltage withstand equipment |
| CN111596149A (en) * | 2020-04-23 | 2020-08-28 | 国网湖南省电力有限公司 | High-voltage test device for power transmission line and high-voltage shunt reactor and application method thereof |
| CN113447778A (en) * | 2021-06-29 | 2021-09-28 | 国网陕西省电力公司电力科学研究院 | Method for performing high-resistance induction withstand voltage and partial discharge test by using circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090826 Termination date: 20091217 |