CN102654564A - Three-parameter monitor of motor bars - Google Patents
Three-parameter monitor of motor bars Download PDFInfo
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- CN102654564A CN102654564A CN2011103617283A CN201110361728A CN102654564A CN 102654564 A CN102654564 A CN 102654564A CN 2011103617283 A CN2011103617283 A CN 2011103617283A CN 201110361728 A CN201110361728 A CN 201110361728A CN 102654564 A CN102654564 A CN 102654564A
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Abstract
The invention discloses a three-parameter monitor of motor bars, which belongs to monitoring instruments and is used for one-line monitor of winding or iron core temperature, vibration and partial discharge. The monitor can overcome the shortcomings of sensing lag of temperature rise, no vibration monitor and difficulty in identifying interference of partial discharge signals of the existing monitoring devices. The monitor comprises a temperature, vibration and partial discharge three-parameter sensor and a preposed signal amplifier, wherein, the three-parameter sensor comprises a temperature sensing element, a vibration sensing element and a sheet-shaped sensing element insulated carrier. The preposed signal amplifier comprises a vibration sensing signal monitoring unit and a temperature sensing signal and discharging radio-frequency signal monitoring unit. The positive effects of the monitor are as follows: the sensing elements are integrated in an insulated sheet-type structure, so that the monitor is convenient for being installed in a motor; the sensing elements are combined with the corresponding signal monitoring units, so that accurate comprehensive monitoring information and reliable technical parameter basis are provided for judging the aging trend of windings and ensuring safety in operation of the motor.
Description
Technical field
The present invention relates to the motor on-line monitoring, be particularly suitable for the on-line monitoring of electric machine iron core, winding temperature, vibration and shelf depreciation.
Background technology
The temperature monitoring of motor windings is the important means that guarantees the normal operation of unit.Normally turning to the sheet type sensor with platinum filament forever packs in the motor windings.The cooling failure of motor windings, insulation breakdown, vibration are excessive etc., and problem all will cause Electrimotor ' too high.But the rising of temperature has tangible hysteresis quality, and it is too high to monitor temperature, and often the motor accident takes place, and causes serious economic loss.Because motor internal narrow space and strong-electromagnetic field environment in the motor fabrication phase, are only imbedded the temperature sensor of sufficient amount, not pre-buried vibration transducer and local discharge sensor usually in iron core and winding.Generally speaking, partial discharge monitoring is to adopt condenser type office to put coupling mechanism, is installed on the gap bridge bus or motor outlet bus of motor internal.Owing to receive the restriction of coupling mechanism size; The point position that quantity and monitoring are installed is very limited; It is far away that the winding local discharge signal is transferred to the path of monitoring point, and identification is disturbed with real local discharge signal and had certain degree of difficulty, and its validity always can not be satisfactory.
Summary of the invention
Target of the present invention provides a kind of motor lines rod three parameter monitoring devices, is used for winding or iron core temperature, vibration and shelf depreciation are carried out on-line monitoring.The temperature rising sensing that overcomes existing monitoring device existence lags behind, the friction monitoring, and local discharge signal is transferred to the deficiencies such as path difficulty identification far away interference of monitoring point.
Monitor of the present invention is by temperature, vibration, shelf depreciation three parameter sensors, and signal preamplifier connects the sensor vibrating sensing signal output lead and temperature sensor signal output lead composition of signal preamplifier; Three parameter sensors wherein comprise temperature-sensing element, vibrating sensing element, laminar sensing element insulating carrier; Contain the vibration sensor signal monitoring means in the signal preamplifier, transducing signal input interface and the output signal transmission interface that is connected the distal displayed instrument are arranged on the signal preamplifier.
The present invention selects for use by charge amplifier, the low-pass filter and the Hi-pass filter that connect charge amplifier, the cable that is connected wave filter and teletransmission interface and forms the vibration sensor signal monitoring means.
Be the sheet of adaptation sensor carrier and higher monitoring accuracy, TEMP original paper of the present invention is that the Pt1000 film platinum resistor constitutes parallel network, and the configuration compensating lead wire, transmits with the three-wire system mode, and output signal and standard high precision PT100 are compatible.The vibrating sensing element uses piezoelectric membrane, and it is shaped as a long n shape.
For making sensor be tending towards the rational deployment of thin typeization and sensing element; Sensing element insulating carrier of the present invention is one the three range upon range of dielectric sheet material that adds bonded structure; Describe by the horizontal positioned shaping; Lower floor is the transducer arrangements layer, and the middle level is the spacing resistance to compression truss of sensor, and the upper strata is an insulation cover plate.
For the radiofrequency signal of utilizing the shelf depreciation process to produce shelf depreciation is monitored, the temperature sensor signal outgoing cable adopts unscreened cable, as shelf depreciation radio frequency receiving antenna; The temperature sensor signal and discharge RF signal monitoring unit be made up of Passive LC high pass, low pass, RC high-cut filter, buffer amplifier are set in signal preamplifier; Three inductors of lc circuit are connected on respectively between the temperature sensor signal input interface and temperature signal teletransmission interface of signal preamplifier in temperature sensor signal and the discharge RF signal monitoring unit; Three capacitors connect the transducing signal input end; Capacitance-resistance type Hi-pass filter connects lc circuit; The output of RC high-cut filter connects buffer amplifier, stube cable line between buffer amplifier output terminal and teletransmission interface.
Good effect of the present invention is: the required sensor of motor windings or iron core temperature, vibration and shelf depreciation is integrated in an insulating thin formula structure monitoring; Eliminated the technology barrier that sensor is installed in motor; Realize multiparameter high precision monitor with two kinds of sensing elements of high sensitivity simultaneously to temperature, vibration, shelf depreciation; Realize approaching continuous monitoring through RTD parallel network and heat-conducting glue, overcome the deficiency of single RTD point measurement.Given sensor and relevant detection unit combination are for passing judgment on the winding aging tendency, guaranteeing the motor safety operation, for preventive maintenance provides comprehensive monitoring information and reliable technique parameter foundation accurately.
Description of drawings
Fig. 1 is the present invention's three parameter sensors outside drawings.
Fig. 2 is a signal preamplifier outside drawing of the present invention.
Fig. 3 motor windings three parameter sensors upper surface figure of the present invention.
Fig. 4 is the inner sensing element arrangenent diagram of the present invention's three parameter sensors.
Fig. 5 is the truss layer structural drawing in the present invention's three parameter sensors sensing element insulating carriers.
Fig. 6 is vibrating sensing element signal monitoring means schematic diagram in the signal preamplifier of the present invention.
Fig. 7 is the temperature sensor signal and the discharge RF signal monitoring unit schematic diagram of signal preamplifier of the present invention
Concrete embodiment:
Consult Fig. 1, Fig. 2; Motor lines rod three parameter monitoring devices of the present invention comprise: by being included in the temperature-sensing element in the leaf insulator carrier, temperature, vibration, the shelf depreciation three parameter sensors A that the vibrating sensing element is formed; Signal preamplifier B, sensor vibrating sensing signal output lead L1 and three temperature sensor signal output lead L2.
Three parameter sensors wherein are installed in motor windings surface or the core lamination stack.Signal preamplifier wherein comprises temperature sensor signal and discharge RF signal monitoring unit and piezoelectric sensor signal monitoring unit.Three interfaces 19 of temperature sensor signal input, vibrating sensing signal input interface 13, three interfaces 20 of temperature signal output teletransmission, vibration output signal output teletransmission interface 17, shelf depreciation vibration signal output teletransmission interface 18, shelf depreciation radiofrequency signal output teletransmission interface 24 are arranged on the prime amplifier housing.
Temperature sensor signal output lead L2 connects signal preamplifier input interface 19.Temperature sensor signal and discharge RF signal monitoring unit are arranged between interface 19 and temperature signal output interface 20 and the shelf depreciation radiofrequency signal output interface 24.Vibrating sensing signal output lead L1 connects signal preamplifier input interface 13.Between interface 13 and vibration output signal output interface 17 and the interface 18 the vibration sensor signal monitoring means is set.Interface 17, interface 18, interface 20, interface 24 connect link to each other with display device such as far-end instrument the remote transfer signal line.
Consult Fig. 3, Fig. 4, the sensor insulating carrier divide to go up (a), in (b), (c) three layers down, adopt that high-temperature insulation gluingly connects, closed assembly forms.Constitute the high precision PT100 surface temperature sensing element 3 of a standard in 10 Pt1000 film platinum resistor parallel connections of lower floor (c) lateral arrangement; Owing to element is longer, there are cumulative errors in the connection resistances between the temperature and resistance of parallel connection, calculates through theoretical, with the P.e.c. 2 and the 5 formation three-wire system signal transmission of respective widths, realizes the fine compensation of lead-in wire error.Temperature sensor signal output lead L2 is high temperature resistant unscreened cable.At temperature-sensing element peripheral disposition n shape cable formula piezoelectric membrane 1, piezoelectric membrane 1 is fixing through several capture pad 4.The signal output cable of cable formula piezoelectric membrane 1 is 50 Europe coaxial shielding cables, and temperature sensor signal is drawn the employing unshielded cable, draws through pad group 6 and 7.
Consult Fig. 3, Fig. 5, the middle level of sensing element insulating carrier (c) is the sensing element truss, comprises liner plate 10, n type groove 8, rectangular channel 9, wire bonds groove 11,12.N type groove 8 is used for positioning and voltage film 1, and rectangular channel 9 is as the resistance to compression groove of temperature-sensing element 3.The height of truss is slightly less than the piezoelectric membrane diameter, and width is slightly larger than the piezoelectric membrane diameter, guarantees that pressure can pass through cover plate and glue-line transmission.Truss is provided with sensor lead welding groove 11,12, and the setting of welding groove has taken into full account transmission cable soldering reliability and pull resistance.Sensor lead is connected to fore-lying device and realizes multiparameter teletransmission along separate routes.
Consult Fig. 6; Piezoelectric sensor signal monitoring unit comprises the one-level charge amplifier 14 that is connected with interface 13 in the signal preamplifier; The road low-pass filter 15 that connects charge amplifier is with No. one BPF. 16, be connected two 50 ohm coaxial cable of wave filter 15,16 respectively, and cable output end connects vibration signal teletransmission interface 17,18.
Consult Fig. 7, temperature sensor signal and discharge RF signal monitoring unit comprise three shunt capacitance C and three the shunt inductance L parameter matching circuit 21 that connect temperature sensor signal input interface 19, capacitance-resistance type Hi-pass filter 22, buffer amplifier 23.Inductance L output terminal jointing temp signal output interface 20, buffer amplifier 23 outputs connect local discharge signal teletransmission interface 24.
The course of work of present embodiment:
Mechanical factor low-frequency vibration monitoring
Consult Fig. 1, Fig. 2, Fig. 4, Fig. 5; Based on the linear deformation of the piezoelectric membrane 1 among the three parameter sensors A to responsive than the low-frequency vibration acceleration signal; The electric signal of piezoelectric membrane extensional vibration output after 14 amplifications of first order charge amplifier, is supervised out low frequency acceleration signal (1HZ-1KHZ) through low-pass filter 15 and is transported to signal preamplifier signal transmission interface 17 through 50 ohm coaxial cable in lead-in wire L1 access piezoelectric sensor signal monitoring unit.
Temperature monitoring
Consult Fig. 1, Fig. 2, Fig. 4, Fig. 6; Pt1000 film platinum resistor among the three parameter sensors A constitutes the temperature signal of parallel network output through the temperature sensor signal monitoring means that lead-in wire L2 inserts signal preamplifier, transports to signal preamplifier temperature signal teletransmission interface 20 through three inductor L respectively.
Measurement of partial discharge:
1, consults Fig. 4, Fig. 6; Transversely deforming based on the piezoelectric membrane 1 among the three parameter sensors A is responsive to the high frequency machinery acoustic emission signal of local discharge generation; In the time of the output vibration acceleration signal, in the transducing signal bandwidth, the mechanic sound that also comprises shelf depreciation transmits.The high and low frequency signal of piezoelectric membrane output is supervised out the high frequency acoustic emission signal (100KHZ-1MHZ) of local discharge generation again through BPF. 16 after first order charge amplifier 14 amplifies, transport to interface 18 through 50 ohm coaxial cable.
2, consult Fig. 1, Fig. 4, Fig. 7; The shelf depreciation radiofrequency signal of temperature-sensing element 3 and the unshielded lead-in wire reception of sensor temperature signal; Behind the cut-in temperature sensor signal monitoring means; Inductance L has wherein been blocked high-frequency signal; Only form path to measuring the low frequency signal that temperature uses, isolated radiofrequency signal through the back one-level capacitance-resistance type Hi-pass filter 22 transport to teletransmission coaxial cable interface 24 with buffering amplifier 23, show additional as shelf depreciation mechanic sound launch monitor with final signal.
Claims (5)
1. motor lines rod three parameter monitoring devices is characterized in that: by temperature, vibration, shelf depreciation three parameter sensors, signal preamplifier connects the sensor vibrating sensing signal output lead and temperature sensor signal output lead composition of signal preamplifier; Three parameter sensors wherein comprise temperature-sensing element, vibrating sensing element, laminar sensing element insulating carrier; Contain the vibration sensor signal monitoring means in the signal preamplifier, transducing signal input interface and the output signal transmission interface that is connected the distal displayed instrument are arranged on the signal preamplifier.
2. according to the motor lines of claim 1 rod three parameter monitoring devices, it is characterized in that: form the vibration sensor signal monitoring means by charge amplifier, the low-pass filter and the Hi-pass filter that connect charge amplifier, the cable that is connected wave filter and teletransmission interface.
3. according to the motor lines rod three parameter monitoring devices of claim 1, it is characterized in that: the TEMP original paper constitutes parallel network for the Pt1000 film platinum resistor, and the configuration compensating lead wire, transmits with the three-wire system mode, and output signal and standard high precision PT100 are compatible; The vibrating sensing element uses piezoelectric membrane, and it is shaped as a long n shape.
4. according to the motor lines of claim 1 rod three parameter monitoring devices; It is characterized in that: the sensing element insulating carrier is one the three range upon range of dielectric sheet material that adds bonded structure; Describe by the horizontal positioned shaping; Lower floor is the transducer arrangements layer, and the middle level is the spacing resistance to compression truss of sensor, and the upper strata is an insulation cover plate.
5. according to the motor lines rod three parameter monitoring devices of claim 1, it is characterized in that: the temperature sensor signal outgoing cable adopts unscreened cable, as shelf depreciation radio frequency receiving antenna; The temperature sensor signal and discharge RF signal monitoring unit be made up of Passive LC high pass, low pass, RC high-cut filter, buffer amplifier are set in signal preamplifier; Three inductors of lc circuit are connected on respectively between the temperature sensor signal input interface and temperature signal teletransmission interface of signal preamplifier in temperature sensor signal and the discharge RF signal monitoring unit; Three capacitors connect the transducing signal input; RC type Hi-pass filter meets LC; RC output connects buffer amplifier, stube cable line between buffer amplifier output terminal and teletransmission interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103617283A CN102654564A (en) | 2011-11-16 | 2011-11-16 | Three-parameter monitor of motor bars |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103617283A CN102654564A (en) | 2011-11-16 | 2011-11-16 | Three-parameter monitor of motor bars |
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| CN102654564A true CN102654564A (en) | 2012-09-05 |
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| CN2011103617283A Pending CN102654564A (en) | 2011-11-16 | 2011-11-16 | Three-parameter monitor of motor bars |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107024654A (en) * | 2015-12-15 | 2017-08-08 | 通用电气公司 | Monitoring system and method for motor |
| CN112067059A (en) * | 2020-11-13 | 2020-12-11 | 宁波中车时代传感技术有限公司 | Temperature vibration composite sensor and manufacturing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06258379A (en) * | 1993-03-10 | 1994-09-16 | Hitachi Cable Ltd | Partial discharge detecting method |
| CN201600439U (en) * | 2009-11-18 | 2010-10-06 | 重庆大学 | Generator state monitoring system based on virtual instrument and wireless sensor network |
| CN201843730U (en) * | 2010-09-25 | 2011-05-25 | 上海宝钢工业检测公司 | State on-line monitoring device of wind generating set |
| CN202421456U (en) * | 2011-11-16 | 2012-09-05 | 哈尔滨瑞格大电机技术有限公司 | Three-parameter monitor for motor wire rod |
-
2011
- 2011-11-16 CN CN2011103617283A patent/CN102654564A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06258379A (en) * | 1993-03-10 | 1994-09-16 | Hitachi Cable Ltd | Partial discharge detecting method |
| CN201600439U (en) * | 2009-11-18 | 2010-10-06 | 重庆大学 | Generator state monitoring system based on virtual instrument and wireless sensor network |
| CN201843730U (en) * | 2010-09-25 | 2011-05-25 | 上海宝钢工业检测公司 | State on-line monitoring device of wind generating set |
| CN202421456U (en) * | 2011-11-16 | 2012-09-05 | 哈尔滨瑞格大电机技术有限公司 | Three-parameter monitor for motor wire rod |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107024654A (en) * | 2015-12-15 | 2017-08-08 | 通用电气公司 | Monitoring system and method for motor |
| CN112067059A (en) * | 2020-11-13 | 2020-12-11 | 宁波中车时代传感技术有限公司 | Temperature vibration composite sensor and manufacturing method thereof |
| CN112067059B (en) * | 2020-11-13 | 2021-04-20 | 宁波中车时代传感技术有限公司 | Temperature vibration composite sensor and manufacturing method thereof |
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Application publication date: 20120905 |