CN203414565U - Monitoring device of shaft neck insulation state of main shaft of water wheel generator group - Google Patents
Monitoring device of shaft neck insulation state of main shaft of water wheel generator group Download PDFInfo
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- CN203414565U CN203414565U CN201320503489.5U CN201320503489U CN203414565U CN 203414565 U CN203414565 U CN 203414565U CN 201320503489 U CN201320503489 U CN 201320503489U CN 203414565 U CN203414565 U CN 203414565U
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Abstract
The utility model relates to a monitoring device of a shaft neck insulation state of a main shaft of a water wheel generator group. After oil film insulation inside a water wheel turbine bearing is damaged, a current loop is formed by shaft voltage via bearing supports on two ends of a motor due to a bearing seat of the other side of a rotor is connected with ground. When shaft voltage is applied to a bearing oil film, once the oil film is damaged, a heavy shaft current is generated so that the internal surface of a bearing is burned and small pits are formed, the bearing is damaged because of acceleration of mechanical wearing, and a bearing bushing is burned out when the situation is serious. Two insulating plates are installed between a rack and a guide bushing of the main shaft, and an electrode is led out of the two insulating plates. Resistor measuring circuits used for measuring a Rx1 and a Rx2 simultaneously are established on the two paths of the insulating plates so that insulating values of the Rx1 and the Rx2 are detected. An upstream side is maintained to be in great insulation state by the monitoring device, and a channel, which is used for generating shaft current, of shaft voltage can be cut off so that the shaft bushing can be prevented from being corroded, precise advance warning can be performed on the operation state of the generator group, and thus the monitoring device is high in forecast precision.
Description
Technical field
the utility model relates to the state monitoring apparatus in a kind of water wheels unit, is specifically related to the monitoring device of the large shaft neck state of insulation of a kind of hydrogenerator unit.
Background technology
The magnetoconductivity of the fan-shaped stamping that a cause stator core adopts, rotor eccentricity rate, fanning strip is all different, it is asymmetric that the generators such as axial channel cooling and clamping use are manufactured magnetic, motor is because of the non-uniform air-gap between stator and rotor, cause macro-axis center and magnetic field center not on same line, or large shaft portion is magnetized, thereby inevitably produced induced voltage.
After the insulation of oil film in hydrodynamic bearing is destroyed, bearing seat ground connection due to rotor opposite side, shaft voltage forms current return by motor bearings at both ends support, its discharge loop is: generator's motor shaft---axle journal---bearing shell---bearing---support---unit base.
Threaten maximum shaft current often to occur in axle journal, when shaft voltage is applied on bearing film, once oil film breakdown, will produce very large shaft current, to burn small rut at bearing inner surface, bearing can accelerate breakage because of mechanical wear, when serious, can burn out bearing shell, traditional bearing shell insulation mostly is monolithic insulcrete, and correctly line is measured the state of insulation of bearing shell.
Summary of the invention
The purpose of this utility model is to provide a kind of monitoring device that can accurately judge the large shaft neck state of insulation of hydrogenerator unit whether axle journal insulate.
The technical scheme that the utility model adopts is:
A monitoring device for the large shaft neck state of insulation of hydrogenerator unit, is characterized in that:
Between the frame of macro-axis and guide shoe, two insulcretes are installed, extraction electrode between two insulcretes;
The resistance of electrode pair macro-axis is Rx1, and the resistance of electrode pair frame is Rx2, builds and be useful on the resistance measuring circuit of simultaneously measuring Rx1 and Rx2 on two-way insulcrete.
In described resistance measuring circuit, resistance R x1 and Rx2 are connected to divider resistance R1 and R2 and current-limiting resistance RS simultaneously, and be connected to separately accurate sampling resistor network R31, R32, R33 and R34, electronic switch AQW214H is according to the control signal of single-chip microcomputer C8051F580, in accurate sampling resistor network, select in good time sampling resistor, sampled voltage is sent into analog to digital converter MAX197 by operational amplifier BB5873AM, sends into single-chip microcomputer C8051F580 after output;
The data of the reception of single-chip microcomputer C8051F580 as calculated, are sent into digital to analog converter DAC7513, and the magnitude of voltage of digital to analog converter DAC7513 output is sent into analog to digital converter AD694, and output is for characterizing the current value of insulation values.
On described single-chip microcomputer C8051F580, be connected to for the analog to digital converter MAX485 of communication is provided to host computer, and for single-chip microcomputer C8051F580 being carried out to the Darlington transistor ULN2003 of drive amplification, the output relay RELAY that Darlington transistor ULN2003 access is reported to the police for dry contact.
The utlity model has following advantage:
The device of a kind of on-line monitoring bearing shell insulation that the utility model provides; hydraulic generator unit upstream side (before rotor) bearing shell is done to insulation processing; grounding carbon brush is established in downstream; upstream side keeps good state of insulation; can cut off the passage of shaft voltage generation shaft current; thereby protection bearing shell is not etched, and the utility model can be made accurately early warning in advance to operating states of the units, and forecast accuracy is high.
Accompanying drawing explanation
Fig. 1 is the utility model structure composition diagram.
Fig. 2 is for measuring the ultimate principle figure of insulation resistance.
Fig. 3 is the circuit theory diagrams of realizing of measurement mechanism.
In figure, 1-macro-axis, 2-guide shoe, 3-the first insulcrete, 4-electrode, 5-the second insulcrete, 6-frame.
Embodiment
Below in conjunction with embodiment, the utility model is described in detail.
The monitoring device of the large shaft neck state of insulation of a kind of hydrogenerator unit that the utility model is related, on bearing shell, increase an insulating electrode that has both sides insulcrete to wrap up, adopt twin-channel metering system difference potential electrode to macro-axis and electrode, to arrive the insulation values of frame, when on bearing shell, insulation resistance changes, automatically select sampling resistor value, so that precision measurement, metering system is online measurement in real time.Concrete structure is, between the frame 6 of macro-axis 1 and guide shoe 2, two insulcretes is installed, and referring to Fig. 1, is respectively extraction electrode 4 between the first insulcrete 3 and 5, two insulcretes of the second insulcrete; The resistance of 4 pairs of macro-axis 1 of electrode is Rx1, and the resistance of 4 pairs of frames 6 of electrode is Rx2, builds and be useful on the resistance measuring circuit of simultaneously measuring Rx1 and Rx2 on two-way insulcrete.
Traditional bearing shell insulation mostly is monolithic insulcrete, correctly line is measured the state of insulation of bearing shell, the utility model feature is that the insulcrete of bearing shell is divided into two, centre accompanies insulating electrode and draws, measure respectively electrode pair macro-axis, the insulation values of electrode pair frame, thus judge whole state of insulation.Take Rx1 as example, build as the circuit model in Fig. 2, in Fig. 2, RS is current-limiting resistance, and R1, R2 are divider resistance, determines the magnitude of voltage of insulation resistance branch road, the equivalent resistance of Rx1Wei mono-road insulcrete by the voltage U r on measurement R2.R3 is the sampling resistor of insulation resistance branch road to be measured.According to following formula, can obtain the value of Rx1:
Ur*(R1+R2)/R2=Ui*(Rx1+R3)/R3?→?Rx1=UrR3*(R1+R2)/UiR2?-?R3
Ur and Ui adopt synchronized sampling, and measuring accuracy is high.Insulation resistance value measurement range is thought of as 10K Ω ~ 5M Ω.
Referring to Fig. 3, RS, R1 in figure, R2, Rx1, Rx2 are consistent with Fig. 2.R31, R32, R33, R34 are accurate sampling electric network, and AQW214H is electronic switch, and the control signal that it sends according to single-chip microprocessor MCU (the dragon C8051F580 of Xinhua) selects suitable resistance as in good time sampling resistor in precision resistance network.BB5873AM is operational amplifier, for transformed samples voltage, sends into MAX197, and MAX197 is the analog to digital converter of 8 passages, for the voltage of measuring basis voltage and two-way sampling resistor.MAX485 is for providing communication to host computer, and agreement adopts MODBUS RTU.ULN2003 be Darlington transistor for the drive amplification function of MCU, guarantee the action message of output relay RELAY, relay contact is reported to the police for dry contact.DAC7513 is a digital to analog converter, and digital quantity is converted to analog voltage, then transfers voltage to 4-20mA current value through AD694.This current value characterizes insulation values.
It is cited that content of the present utility model is not limited to embodiment, and the conversion of any equivalence that those of ordinary skills take technical solutions of the utility model by reading the utility model instructions, is claim of the present utility model and contains.
Claims (3)
1. a monitoring device for the large shaft neck state of insulation of hydrogenerator unit, is characterized in that:
Between the frame (6) of macro-axis (1) and guide shoe (2), two insulcretes are installed, extraction electrode (4) between two insulcretes;
Electrode (4) is Rx1 to the resistance of macro-axis (1), and electrode (4) is Rx2 to the resistance of frame (6), builds and be useful on the resistance measuring circuit of simultaneously measuring Rx1 and Rx2 on two-way insulcrete.
2. the monitoring device of the large shaft neck state of insulation of a kind of hydrogenerator unit according to claim 1, is characterized in that:
In described resistance measuring circuit, resistance R x1 and Rx2 are connected to divider resistance R1 and R2 and current-limiting resistance RS simultaneously, and be connected to separately accurate sampling resistor network R31, R32, R33 and R34, electronic switch AQW214H is according to the control signal of single-chip microcomputer C8051F580, in accurate sampling resistor network, select in good time sampling resistor, sampled voltage is sent into analog to digital converter MAX197 by operational amplifier BB5873AM, sends into single-chip microcomputer C8051F580 after output;
The data of the reception of single-chip microcomputer C8051F580 as calculated, are sent into digital to analog converter DAC7513, and the magnitude of voltage of digital to analog converter DAC7513 output is sent into analog to digital converter AD694, and output is for characterizing the current value of insulation values.
3. the monitoring device of the large shaft neck state of insulation of a kind of hydrogenerator unit according to claim 2, is characterized in that:
On described single-chip microcomputer C8051F580, be connected to for the analog to digital converter MAX485 of communication is provided to host computer, and for single-chip microcomputer C8051F580 being carried out to the Darlington transistor ULN2003 of drive amplification, the output relay RELAY that Darlington transistor ULN2003 access is reported to the police for dry contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320503489.5U CN203414565U (en) | 2013-08-19 | 2013-08-19 | Monitoring device of shaft neck insulation state of main shaft of water wheel generator group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320503489.5U CN203414565U (en) | 2013-08-19 | 2013-08-19 | Monitoring device of shaft neck insulation state of main shaft of water wheel generator group |
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| Publication Number | Publication Date |
|---|---|
| CN203414565U true CN203414565U (en) | 2014-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320503489.5U Expired - Lifetime CN203414565U (en) | 2013-08-19 | 2013-08-19 | Monitoring device of shaft neck insulation state of main shaft of water wheel generator group |
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| CN (1) | CN203414565U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548655A (en) * | 2015-12-07 | 2016-05-04 | 辽宁东科电力有限公司 | Device for monitoring and controlling shaft voltage and shaft current of turbo-generator online |
| CN106772049A (en) * | 2017-02-28 | 2017-05-31 | 中广核研究院有限公司 | Generator's motor shaft insulating monitoring and positioner and method |
| CN107528407A (en) * | 2016-06-20 | 2017-12-29 | 东方电气集团东方电机有限公司 | A kind of umbrella-type generator axle insulation system |
| CN110514902A (en) * | 2019-09-05 | 2019-11-29 | 中广核核电运营有限公司 | Generator excitation watt insulator resistor detecting device |
| CN110703090A (en) * | 2019-08-30 | 2020-01-17 | 江苏核电有限公司 | Generator shaft current detection device |
| CN111983325A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring resistance value of generator sealing tile by current time method |
| CN111983324A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring resistance value of generator sealing tile by equipotential method |
| CN111983323A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring resistance value of generator sealing tile by induction voltage method |
| CN113532776A (en) * | 2021-06-23 | 2021-10-22 | 杭州意能电力技术有限公司 | Generator shaft tile pillow insulating pad failure diagnosis method and system |
| CN114542357A (en) * | 2022-02-18 | 2022-05-27 | 中国长江电力股份有限公司 | Hydraulic generator set large shaft insulation monitoring protection logic optimization method |
-
2013
- 2013-08-19 CN CN201320503489.5U patent/CN203414565U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548655A (en) * | 2015-12-07 | 2016-05-04 | 辽宁东科电力有限公司 | Device for monitoring and controlling shaft voltage and shaft current of turbo-generator online |
| CN107528407A (en) * | 2016-06-20 | 2017-12-29 | 东方电气集团东方电机有限公司 | A kind of umbrella-type generator axle insulation system |
| CN106772049A (en) * | 2017-02-28 | 2017-05-31 | 中广核研究院有限公司 | Generator's motor shaft insulating monitoring and positioner and method |
| CN110703090B (en) * | 2019-08-30 | 2022-04-19 | 江苏核电有限公司 | Generator shaft current detection device |
| CN110703090A (en) * | 2019-08-30 | 2020-01-17 | 江苏核电有限公司 | Generator shaft current detection device |
| CN110514902B (en) * | 2019-09-05 | 2021-12-24 | 中广核核电运营有限公司 | Generator excitation shoe insulator resistance detection device |
| CN110514902A (en) * | 2019-09-05 | 2019-11-29 | 中广核核电运营有限公司 | Generator excitation watt insulator resistor detecting device |
| CN111983324A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring resistance value of generator sealing tile by equipotential method |
| CN111983323A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring resistance value of generator sealing tile by induction voltage method |
| CN111983325A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring resistance value of generator sealing tile by current time method |
| CN111983323B (en) * | 2020-07-03 | 2023-09-19 | 中广核核电运营有限公司 | Method and device for measuring resistance of generator sealing tile by induced voltage method |
| CN113532776A (en) * | 2021-06-23 | 2021-10-22 | 杭州意能电力技术有限公司 | Generator shaft tile pillow insulating pad failure diagnosis method and system |
| CN114542357A (en) * | 2022-02-18 | 2022-05-27 | 中国长江电力股份有限公司 | Hydraulic generator set large shaft insulation monitoring protection logic optimization method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140129 |