CN104849608B - The ungrounded end of rotor axis of electric whether there is the detection method of earth fault - Google Patents
The ungrounded end of rotor axis of electric whether there is the detection method of earth fault Download PDFInfo
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- CN104849608B CN104849608B CN201510262346.3A CN201510262346A CN104849608B CN 104849608 B CN104849608 B CN 104849608B CN 201510262346 A CN201510262346 A CN 201510262346A CN 104849608 B CN104849608 B CN 104849608B
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Abstract
The present invention tests the problem of can not reacting actual conditions completely there is provided a kind of detection method to solve the ungrounded termination earth fault of existing rotor axis of electric, comprises the following steps：Magnet exciting coil is set in motor stator and rotor airgap, and the two ends of magnet exciting coil are connected on the adjustable ac power supply apparatus of voltage, the number of turn of magnet exciting coil is n；In the first voltage table of magnet exciting coil two ends connecting detection magnet exciting coil both end voltage, the magnitude of voltage that first voltage table is detected is U1；Second voltage table is connected between the ungrounded end of rotor axis of electric and ground, the magnitude of voltage that second voltage table is detected is U2；The output voltage of ac power supply apparatus is adjusted, if U1/n is consistently equal to U2, the ungrounded end of rotor axis of electric is not present earth fault, otherwise there is earth fault.The present invention can simply, accurately detect the ungrounded termination earth fault of rotor axis of electric, and suitable for all types of motors, greatly promote the scope of application of detection method.
Description
Technical field
The invention belongs to electric equipment test detection correlative technology field, specifically, it is related to a kind of rotor axis of electric non-
Earth terminal whether there is the detection method of earth fault.
Background technology
The armature spindle of the motor device of rotation can produce certain shaft voltage in normal operation at a high speed, if shaft voltage
Suppress and safeguard procedures are not proper, once forming loop, shaft current will be produced.Stronger shaft current can produce electric arc, make profit
Sliding rapid degradation, and cause the galvano-cautery of axle journal and bearing alloy, failure is caused, while stronger shaft current can also be brought seriously
Equipment magnetization, cause vibration etc. failure, cause stopping accident.
What prevention shaft voltage endangered focuses on preventing shaft current formation path, is blocked as long as effective loop can be formed,
The generation of the problem can be prevented.Therefore motor and generator, which are encouraged, must use exhausted between end bearing and bottom plate, bearing and oil pipe
Edge blocks path, due to the usual very little of shaft voltage（Not higher than 10V）, it is only necessary to very low insulation conditions can prevent electricity
Stream.In practical application, because the other end of armature spindle is ground state, therefore in earth-free one end generally using double-deck exhausted
Edge, i.e. bearing insulation be divided into above and below two layers, centre folder layer of metal plate is drawn a wire above metallic plate and is connected to outside machine,
It is easy to test insulaion resistance.
, can only indirect reaction turn by such a method surveys the insulaion resistance that insulaion resistance is actually bearing intermetallic metal
The insulation status of sub- axle, but be due to that armature spindle end structure is complicated, the part for generally also having other to be contacted with big axle, such as
Sealing bearing bush, sensor etc., this method can not react actual conditions completely, at present also not as a kind of indirect measurement method
There is judgement to encourage the direct measuring method whether end is grounded.
The content of the invention
The present invention in order to the bearing insulation at the ungrounded end for solving existing rotor axis of electric generally fall into above and below two layers, it is middle
Press from both sides layer of metal plate, a wire drawn above metallic plate and is connected to outside machine, with test present in insulaion resistance can not be complete
There is provided the detection method that a kind of ungrounded end of rotor axis of electric whether there is earth fault for the problem of reacting actual conditions.
The technical problem solved required for of the invention, can be achieved through the following technical solutions：
A kind of ungrounded end of rotor axis of electric whether there is the detection method of earth fault, and the rotor axis of electric is ungrounded
It is provided between the bearing and base at end between dielectric layers, the dielectric layers and is provided with layer of metal plate, its feature exists
In comprising the following steps：
The 1st, magnet exciting coil is set in motor stator and rotor airgap, and it is adjustable that the two ends of magnet exciting coil are connected into voltage
Ac power supply apparatus on, the number of turn of the magnet exciting coil is n；
2nd, in the first voltage table of magnet exciting coil two ends connecting detection magnet exciting coil both end voltage, the first voltage table inspection
The magnitude of voltage measured is U1；
3rd, second voltage table, the voltage that second voltage table is detected are connected between the ungrounded end of rotor axis of electric and ground
It is worth for U2；
4th, the output voltage of ac power supply apparatus is adjusted, if U1/n is consistently equal to U2, the ungrounded end of rotor axis of electric
In the absence of earth fault, otherwise, there is earth fault in the ungrounded end of rotor axis of electric.
In the present invention, the number of turn of the magnet exciting coil is 3 to 8 circles, and magnet exciting coil is arranged in series.
In the present invention, the output voltage range of the ac power supply apparatus is 30V to 80V.
The ac power supply apparatus includes, 220V mains supplies and the pressure regulator being connected with 220V mains supplies, the tune
Depressor is connected to the two ends of magnet exciting coil.
In the present invention, the magnet exciting coil uses single multicore cable, and every cored wire of the cable is a circle coil, institute
State each cored wire and be independently accessed ac power supply apparatus.
The color of the every cored wire is different, in order to carry out wiring.
The ungrounded end of rotor axis of electric of the present invention whether there is the detection method of earth fault, by detecting motor stator
With the voltage at magnet exciting coil two ends in rotor airgap, and the voltage of the ungrounded end of rotor axis of electric over the ground, based on therebetween
The corresponding relation of voltage, you can simply, the ungrounded end of detection rotor axis of electric whether there is earth fault exactly, and be applicable
In all types of motors, the scope of application of detection method is greatly promoted.
Brief description of the drawings
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the insulation system schematic diagram at the ungrounded end of rotor axis of electric of the present invention.
Fig. 2 is the wiring diagram of detection means of the present invention.
Fig. 3 is the circuit theory diagrams of detection means of the present invention.
Embodiment
In order that technological means, creation characteristic, reached purpose and effect of the present invention are easy to understand, with reference to tool
Body is illustrated, and the present invention is expanded on further.
Idea of the invention is that, by the analysis to the ungrounded end insulation system of existing rotor axis of electric, find existing
The bearing insulation at the ungrounded end of rotor axis of electric generally fall into above and below two layers, centre folder layer of metal plate draws above metallic plate
Go out a wire to be connected to outside machine, with test present in insulaion resistance the problem of can not reacting actual conditions completely, pass through this
Invention provides a kind of ungrounded end of rotor axis of electric with the presence or absence of the detection method of earth fault to solve the above problems.
Referring to Fig. 1, the targeted motor of the present invention is at the ungrounded end of its armature spindle（Insulating end）The insulation system used
It is identical with existing conventional structure, dielectric layers, this reality are set between the bearing and base at the ungrounded end of rotor axis of electric
Apply in example, then dielectric layers set layer of metal plate using two layers of pad of becoming attached between two layers of insulation spacer（Iron plate）,
In the prior art, it is that an extraction piece wire in face is connected to outside machine on a metal plate, carries out megger test, aforesaid way is present
The problem of, herein with regard to no longer carrying out tired state.
With reference to Fig. 1, referring to Fig. 2 and Fig. 3, the ungrounded end of rotor axis of electric of the present invention whether there is the detection side of earth fault
Method, sets magnet exciting coil in motor stator and rotor airgap first, and magnet exciting coil is configured using multiturn, according to electric machinery
The difference of type, the number of turn n of magnet exciting coil is set to 3 to 8 circles, and magnet exciting coil is arranged in series, the two ends connection voltage of magnet exciting coil
In adjustable ac power supply apparatus, the present embodiment, ac power supply apparatus includes 220V mains supplies and connected with 220V mains supplies
The pressure regulator connect, pressure regulator is connected to the two ends of magnet exciting coil, by connecting first voltage table U1 at the two ends of magnet exciting coil, enters
The voltage at row detection magnet exciting coil two ends, meanwhile, by connecting second voltage between the ungrounded end of rotor axis of electric and ground
Table U2, carries out the voltage between the ungrounded end and ground of detection rotor axis of electric.
Detection means of the present invention to the ungrounded end of rotor with the presence or absence of earth fault when detecting, first, leads to
Cross the output alternating current of ac power supply apparatus, and the output voltage range of ac power supply apparatus be arranged on 30V between 80V,
If adjusting the output voltage of ac power supply apparatus anyway, first voltage table U1 magnitude of voltage U1/n is consistently equal to the second electricity
The magnitude of voltage U2 of table is pressed, then illustrates that earth fault is not present in the ungrounded end of the rotor axis of electric, otherwise, rotor axis of electric is ungrounded
There is earth fault in end.
In the present invention, magnet exciting coil forms a device for being similar to transformer with rotor axis of electric, and magnet exciting coil can
Regard the primary side of transformer as, the earth terminal of armature spindle and armature spindle can regard transformer secondary as, and secondary is at second voltage table U2
For Light Condition, if there is no otherwise ground connection in armature spindle（Insulation is good）, then U2=U1/n, if earth fault, shows
Right U2 voltage can reduce.
In the present invention, for the ease of realizing the wiring of magnet exciting coil, magnet exciting coil can use single multicore cable, cable
Every cored wire be a circle coil, each cored wire is independently accessed ac power supply apparatus, and specifically in operation, one can be set again
Panel, sets the binding post of multiple color on panel, and every cored wire of multicore cable uses different colors, cored wire color
Carried out with the color of the binding post of panel to cored wire access power supply can be achieved with access.
Only preferred embodiments of the present invention are described above, but are not to be construed as limiting the scope of the invention.This
Invention is not only limited to above example, and its concrete structure allows to change.In a word, all guarantors in independent claims of the present invention
The various change made in the range of shield is within the scope of the present invention.
Claims (6)
1. the ungrounded end of rotor axis of electric whether there is the detection method of earth fault, the axle at the ungrounded end of rotor axis of electric
Hold and dielectric layers are provided between base, layer of metal plate is provided between the dielectric layers, it is characterised in that including
Following steps：
1）Magnet exciting coil is set in motor stator and rotor airgap, and the two ends of magnet exciting coil are connected to the adjustable friendship of voltage
Flow on supply unit, the number of turn of the magnet exciting coil is n；
2）In the first voltage table of magnet exciting coil two ends connecting detection magnet exciting coil both end voltage, the first voltage table is detected
Magnitude of voltage be U1；
3）Second voltage table is connected between the ungrounded end of rotor axis of electric and ground, the magnitude of voltage that second voltage table is detected is
U2；
4）The output voltage of ac power supply apparatus is adjusted, if U1/n is consistently equal to U2, the ungrounded end of rotor axis of electric is not deposited
In earth fault, otherwise, there is earth fault in the ungrounded end of rotor axis of electric.
2. the ungrounded end of rotor axis of electric according to claim 1 whether there is the detection method of earth fault, its feature
It is：The number of turn of the magnet exciting coil is 3 to 8 circles, and magnet exciting coil is arranged in series.
3. the ungrounded end of rotor axis of electric according to claim 1 whether there is the detection method of earth fault, its feature
It is：The output voltage range of the ac power supply apparatus is 30V to 80V.
4. the ungrounded end of rotor axis of electric according to claim 3 whether there is the detection method of earth fault, its feature
It is：The ac power supply apparatus includes, 220V mains supplies and the pressure regulator being connected with 220V mains supplies, the pressure regulator
It is connected to the two ends of magnet exciting coil.
5. the ungrounded end of rotor axis of electric according to claim 1 whether there is the detection method of earth fault, its feature
It is：The magnet exciting coil uses single multicore cable, and every cored wire of the cable is a circle coil, the cable it is each
Cored wire is independently accessed ac power supply apparatus.
6. the ungrounded end of rotor axis of electric according to claim 5 whether there is the detection method of earth fault, its feature
It is：The color of the every cored wire is different.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510262346.3A CN104849608B (en) | 2015-05-21 | 2015-05-21 | The ungrounded end of rotor axis of electric whether there is the detection method of earth fault |
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| CN201510262346.3A CN104849608B (en) | 2015-05-21 | 2015-05-21 | The ungrounded end of rotor axis of electric whether there is the detection method of earth fault |
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| CN104849608B true CN104849608B (en) | 2017-08-29 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105277861A (en) * | 2015-11-19 | 2016-01-27 | 南车株洲电机有限公司 | Method for testing motor bearing dielectric strength |
| CN106707119A (en) * | 2016-12-23 | 2017-05-24 | 中国二冶集团有限公司 | Insulation detection method for large- scale motor bearing |
| CN111983324B (en) * | 2020-07-03 | 2023-06-16 | 中广核核电运营有限公司 | Method and device for measuring resistance of sealing tile of generator by equipotential method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202309387U (en) * | 2011-09-26 | 2012-07-04 | 孙平飞 | Permanent magnet motor provided with high harmonic elimination mechanism |
| CN102721903A (en) * | 2012-05-08 | 2012-10-10 | 河北省电力研究院 | Device and method for detecting turn-to-turn insulation failure of rotor winding of generator |
| CN103018567A (en) * | 2012-11-30 | 2013-04-03 | 上海电气电站设备有限公司 | Rotor grounding detection device |
| CN103543371A (en) * | 2012-07-09 | 2014-01-29 | 本田技研工业株式会社 | Ground fault detecting device for an ungrounded circuit |
| CN103558496A (en) * | 2013-11-14 | 2014-02-05 | 阳光电源股份有限公司 | Single pole grounding system and fault detection device and method thereof |
| CN103630837A (en) * | 2013-12-07 | 2014-03-12 | 大唐鸡西第二热电有限公司 | Generator rotor grounding detection circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008043103A1 (en) * | 2008-10-22 | 2010-04-29 | Alstrom Technology Ltd. | Apparatus and method for monitoring and / or analyzing rotors of electric machines in operation |
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- 2015-05-21 CN CN201510262346.3A patent/CN104849608B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202309387U (en) * | 2011-09-26 | 2012-07-04 | 孙平飞 | Permanent magnet motor provided with high harmonic elimination mechanism |
| CN102721903A (en) * | 2012-05-08 | 2012-10-10 | 河北省电力研究院 | Device and method for detecting turn-to-turn insulation failure of rotor winding of generator |
| CN103543371A (en) * | 2012-07-09 | 2014-01-29 | 本田技研工业株式会社 | Ground fault detecting device for an ungrounded circuit |
| CN103018567A (en) * | 2012-11-30 | 2013-04-03 | 上海电气电站设备有限公司 | Rotor grounding detection device |
| CN103558496A (en) * | 2013-11-14 | 2014-02-05 | 阳光电源股份有限公司 | Single pole grounding system and fault detection device and method thereof |
| CN103630837A (en) * | 2013-12-07 | 2014-03-12 | 大唐鸡西第二热电有限公司 | Generator rotor grounding detection circuit |
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| CN104849608A (en) | 2015-08-19 |
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