CN103398794A - On-line monitoring system for end parameters of large power generating equipment - Google Patents
On-line monitoring system for end parameters of large power generating equipment Download PDFInfo
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- CN103398794A CN103398794A CN2013103207767A CN201310320776A CN103398794A CN 103398794 A CN103398794 A CN 103398794A CN 2013103207767 A CN2013103207767 A CN 2013103207767A CN 201310320776 A CN201310320776 A CN 201310320776A CN 103398794 A CN103398794 A CN 103398794A
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Abstract
The invention discloses an on-line monitoring system for end parameters of large power generating equipment. A series of Pt100 temperature sensors and magnetic test coils are installed at the end part of a motor to measure the temperature and the magnetic induction intensity of an end iron core of the motor, an edge segment iron core and the key position of a pressing structure. Measuring signals are subjected to signal conditioning and collecting through a front signal conditioning and collecting instrument to be converted into digital signals, the digital signals are transmitted to an upper monitoring computer through an RS-485 industrial field bus, and the upper monitoring computer utilizes monitoring software to process measuring data. The measuring data is computed and analyzed through expert system software and is compared with a set value in the expert system software, and then various prompts of normal working, early warning and danger are given to ensure the safe running of a generator unit.
Description
Technical field
The present invention relates to the on-line monitoring system of a kind of large power generating equipment end parameter.
Background technology
Along with the continuous increase of high-rating generator place capacity, make the end magnetic field of huge generator distribute rationally, reduce the wastage and raise the efficiency, prevent that local overheating from becoming focal issue at present.The research that the high-rating generator end magnetic field distributes receives the concern of industry always and this is carried out to research widely.The method that people adopt theory to calculate is usually analyzed and is studied the end electromagnetic field of turbodynamo, sometimes also with the method for test, measures the parameter of large power generating equipment end, with the result of this proof theory calculating.
Usually the large-sized turbine generator stator core end is by end construction spare, iron core to be fixed and to compress, prevent motor from operational process, iron core looseness occurring and cause the overheated and excessive potential safety hazard that causes to motor of vibration unshakable in one's determination, in addition, Stator End Winding magnetic field also can be in end construction spare inductive loop and cause heating.Therefore whether temperature, the magnetic induction density parameter of on-line monitoring high-rating generator end key position be normal, is an effective means that guarantees unit safety operation.
Summary of the invention
Fundamental purpose of the present invention is to disclose a kind of large power generating equipment end parameter online system, related technology is mainly the turbo-generator end parameter online, by the application of large power generating equipment end parameter online system, reach the purpose that on-line monitoring End of Turbogenerator parameter guarantees unit safety operation.the present invention is achieved through the following technical solutions: a kind of large power generating equipment end parameter online system, this system is arranged on the motor end core by several, the limit iron leg heart and compressing structure spare surface need the Pt100 temperature sensor P1 at monitoring position, P2, Pm is arranged on the magentic test coil C1 of motor end same area, C2, Cm, terminal board on motor stator base (1), the preposition conditioning sampling instrument of signal (2), host computer (3) forms, the preposition conditioning Acquisition Instrument of signal (2) is the major part of on-line monitoring system, its CPU (central processing unit) adopts the C8051F020 single-chip microcomputer of Cygnal company, its signal conditioning circuit amplifies conditioning to the output signal of magentic test coil and Pt100 and becomes the standard sample voltage signal that can be changed by the A/D circuit, the multicircuit switch circuit that consists of the MAX333 chip is switched to respectively a road output channel to the multichannel input signal, by the A/D change-over circuit that 24 high-precision A/D conversion chip AD7711A forms of U.S. ANALOG DEVICE company, realize the high precision conversion of simulating signal to digital signal, the temperature signal and the magnetic induction density signal that under central processing unit controls, are converted to digital quantity are sent to upper monitoring computer (3) by the RS-485 industrial field bus, host computer (3) utilizes monitoring of software to process measurement data, the preposition conditioning sampling instrument of described signal (2), wherein: U11, U12 ..., U1m is the magentic test coil signal conditioning circuit, the output weak signal of magentic test coil is carried out to strict linearity and amplify, make it become the standard AC sampling voltage signal that can be changed by the A/D circuit, U21, U22 ..., U2m is Pt100 temperature sensor signal modulate circuit, it is processed the output resistance of Pt100 to become the standard direct current sampled voltage signal that can be changed by the A/D circuit through full-bridge circuit, the multicircuit switch circuit of U3 for consisting of the MAX333 chip, can be switched to respectively a road output channel to the multichannel input signal, U4 is the A/D change-over circuit that consists of 24 high-precision A of U.S. ANALOG DEVICE company/D conversion chip AD7711A, realizes the high precision conversion of simulating signal to digital signal, U5 is central processing unit CPU, is the control core of the preposition conditioning Acquisition Instrument of signal, U6 is the RS-485 bus module of communication signal level conversion, the output signal access magentic test coil signal conditioning circuit U12 of output signal access magentic test coil signal conditioning circuit U11, the magentic test coil C2 of magentic test coil C1 ..., magnetic coil Cm output signal access magentic test coil signal conditioning circuit U1m, after signal condition, become-5V is to the standard AC sampling voltage signal between+5V, temperature sensor P1 receive temperature sensor signal modulate circuit U21, temperature sensor P2 receive temperature sensor signal modulate circuit U22 ..., temperature sensor Pm receives temperature sensor signal modulate circuit U2m, the resistance signal of temperature sensor becomes the standard direct current sampled voltage signal between 0 to+5V after signal condition, multichannel standard analog signal after these conditionings is transferred to accurate A/D change-over circuit U4 by multicircuit switch U3 and is transformed to digital signal under CPU (central processing unit) U5 controls, then by the RS-485 industrial field bus, is sent to upper monitoring computer by CPU (central processing unit) U5.
Host computer utilizes monitoring of software to process measurement data, by expert system software, carries out computational analysis, and compares with the setting value in expert system, makes the various promptings such as machine operation is normal, early warning, danger.
Because the preposition conditioning Acquisition Instrument of the key instrument signal of on-line monitoring system adopts 24 high-precision A of high-precision signal modulate circuit and U.S. ANALOG DEVICE company/D conversion chip AD7711A, so it is large to have the measurement range of temperature and magnetic induction density, precision is high, the fast characteristics of sample rate.Temperature measurement range is 0 ℃-400 ℃, error is not more than ± and 1 ℃; The magnetic flux density measurement scope is tesla of 0.01 tesla-2.5, and relative error is not more than 0.5%; Sample rate can be up to 1000 sampled points of per second, and this makes this system can be for the on-line monitoring of generator end temperature and the magnetic induction density parameter of various capacity.
The accompanying drawing explanation
Fig. 1 is that the system applies of invention connects block diagram
Fig. 2 is that sensor is at motor end circumferencial direction mounting arrangements schematic diagram
Fig. 3 be sensor in the motor end 0 ° of direction installation site arrangenent diagram
Fig. 4 be sensor in the motor end 90 ° of direction installation site arrangenent diagrams
Fig. 5 is the preposition conditioning Acquisition Instrument of signal theory diagram
Embodiment
Large power generating equipment end parameter online system applies connects block diagram as shown in Figure 1, comprising: be arranged on the positions such as iron core, the limit iron leg heart and compressing structure spare surface that need to monitor the motor end Pt100 temperature sensor P1, P2 ..., Pm; Be arranged on motor end same area magentic test coil C1, C2 ..., Cm; Terminal board 1 on motor stator base; The preposition conditioning sampling instrument 2 of signal; Host computer 3.Pt100 temperature sensor in on-line monitoring system and magentic test coil need to be monitored installation site figure as shown in Figure 2 at motor end circumferencial direction, wherein 0 ° of direction need to be monitored installation site figure as shown in Figure 3 in the motor end, 90 ° of directions need to be monitored installation site figure as shown in Figure 4 in the motor end, in figure: P1-P10 represents to be arranged on Pt100 temperature sensor herein, C1-C10 represents to be arranged on magentic test coil herein, 6 expressions need the generator core center of monitoring, 7 expressions need the limit iron leg heart of monitoring, 8 expression generator unit stator air channels, 9 expressions need the generator unit stator end finger of monitoring, 10 expressions need the pressing ring of stator of power generator of monitoring, 11 expression generator unit stator magnetic shieldings.Be arranged on the temperature sensor P1-P10 of motor stator inner end and the signal cable of magentic test coil C1-C10 and by the terminal board 1 that is arranged on motor stator base, guide to outside motor respectively, be connected to the connection terminal of the preposition conditioning Acquisition Instrument 2 of signal.The major part that the preposition conditioning Acquisition Instrument 2 of signal is on-line monitoring systems, its CPU (central processing unit) adopts the C8051F020 single-chip microcomputer of Cygnal company, preposition conditioning Acquisition Instrument 2 theory diagrams of signal as shown in Figure 5, wherein: U11, U12 ..., U1m is the magentic test coil signal conditioning circuit, the output weak signal of magentic test coil is carried out to strict linearity and amplify, make it become the standard AC sampling voltage signal that can be changed by the A/D circuit; U21, U22 ..., U2m is Pt100 temperature sensor signal modulate circuit, it is processed the output resistance of Pt100 to become the standard direct current sampled voltage signal that can be changed by the A/D circuit through full-bridge circuit; The multicircuit switch circuit of U3 for consisting of the MAX333 chip, can be switched to respectively a road output channel to the multichannel input signal; U4 is the A/D change-over circuit that consists of 24 high-precision A of U.S. ANALOG DEVICE company/D conversion chip AD7711A, realizes the high precision conversion of simulating signal to digital signal; U5 is central processing unit CPU, is the control core of the preposition conditioning Acquisition Instrument of signal; U6 is the RS-485 bus module of communication signal level conversion.The output signal access magentic test coil signal conditioning circuit U12 of output signal access magentic test coil signal conditioning circuit U11, the magentic test coil C2 of magentic test coil C1 ..., magnetic coil Cm output signal access magentic test coil signal conditioning circuit U1m, after signal condition, become-5V is to the standard AC sampling voltage signal between+5V; Temperature sensor P1 receive temperature sensor signal modulate circuit U21, temperature sensor P2 receive temperature sensor signal modulate circuit U22 ..., temperature sensor Pm receives temperature sensor signal modulate circuit U2m, the resistance signal of temperature sensor becomes the standard direct current sampled voltage signal between 0 to+5V after signal condition; Multichannel standard analog signal after these conditionings is transferred to accurate A/D change-over circuit U4 by multicircuit switch U3 and is transformed to digital signal under CPU (central processing unit) U5 controls, then by the RS-485 industrial field bus, is sent to upper monitoring computer 3 by CPU (central processing unit) U5.Host computer 3 utilizes monitoring of software to process measurement data, by expert system software, carry out computational analysis, and compare with the setting value in expert system, make that machine operation is normal, early warning, dangerous various promptings, guarantee the safe operation of genset.
Claims (1)
1. large power generating equipment end parameter online system, it is characterized in that: this system is arranged on the motor end core by several, the limit iron leg heart and compressing structure spare surface need the Pt100 temperature sensor P1 at monitoring position, P2, Pm is arranged on the magentic test coil C1 of motor end same area, C2, Cm, terminal board on motor stator base (1), the preposition conditioning sampling instrument of signal (2), host computer (3) forms, the preposition conditioning Acquisition Instrument of signal (2) is the major part of on-line monitoring system, its CPU (central processing unit) adopts the C8051F020 single-chip microcomputer of Cygnal company, its signal conditioning circuit amplifies conditioning to the output signal of magentic test coil and Pt100 and becomes the standard sample voltage signal that can be changed by the A/D circuit, the multicircuit switch circuit that consists of the MAX333 chip is switched to respectively a road output channel to the multichannel input signal, by the A/D change-over circuit that 24 high-precision A/D conversion chip AD7711A forms of U.S. ANALOG DEVICE company, realize the high precision conversion of simulating signal to digital signal, the temperature signal and the magnetic induction density signal that under central processing unit controls, are converted to digital quantity are sent to upper monitoring computer (3) by the RS-485 industrial field bus, host computer (3) utilizes monitoring of software to process measurement data, the preposition conditioning sampling instrument of described signal (2), wherein: U11, U12 ..., U1m is the magentic test coil signal conditioning circuit, the output weak signal of magentic test coil is carried out to strict linearity and amplify, make it become the standard AC sampling voltage signal that can be changed by the A/D circuit, U21, U22 ..., U2m is Pt100 temperature sensor signal modulate circuit, it is processed the output resistance of Pt100 to become the standard direct current sampled voltage signal that can be changed by the A/D circuit through full-bridge circuit, the multicircuit switch circuit of U3 for consisting of the MAX333 chip, can be switched to respectively a road output channel to the multichannel input signal, U4 is the A/D change-over circuit that consists of 24 high-precision A of U.S. ANALOG DEVICE company/D conversion chip AD7711A, realizes the high precision conversion of simulating signal to digital signal, U5 is central processing unit CPU, is the control core of the preposition conditioning Acquisition Instrument of signal, U6 is the RS-485 bus module of communication signal level conversion, the output signal access magentic test coil signal conditioning circuit U12 of output signal access magentic test coil signal conditioning circuit U11, the magentic test coil C2 of magentic test coil C1 ..., magnetic coil Cm output signal access magentic test coil signal conditioning circuit U1m, after signal condition, become-5V is to the standard AC sampling voltage signal between+5V, temperature sensor P1 receive temperature sensor signal modulate circuit U21, temperature sensor P2 receive temperature sensor signal modulate circuit U22 ..., temperature sensor Pm receives temperature sensor signal modulate circuit U2m, the resistance signal of temperature sensor becomes the standard direct current sampled voltage signal between 0 to+5V after signal condition, multichannel standard analog signal after these conditionings is transferred to accurate A/D change-over circuit U4 by multicircuit switch U3 and is transformed to digital signal under CPU (central processing unit) U5 controls, then by the RS-485 industrial field bus, is sent to upper monitoring computer by CPU (central processing unit) U5.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110530546A (en) * | 2019-08-16 | 2019-12-03 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of temperature sampling circuit |
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| CN101813756A (en) * | 2010-04-23 | 2010-08-25 | 华北电力大学 | Method for manufacturing transient high-frequency magnetic field of power system |
| US20110273121A1 (en) * | 2010-05-04 | 2011-11-10 | Remy Technologies, Llc | Electric Machine Component Temperature Monitoring |
| CN202305048U (en) * | 2011-10-31 | 2012-07-04 | 莱芜科泰电力科技有限公司 | On-line monitoring device for high voltage cable |
| CN202734974U (en) * | 2012-06-20 | 2013-02-13 | 江苏常牵庞巴迪牵引系统有限公司 | Temperature on-line monitoring device for motor rotor |
| CN202956217U (en) * | 2012-12-06 | 2013-05-29 | 西安工程大学 | Primary equipment temperature on-line monitoring system for concentrative intelligent substation |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813756A (en) * | 2010-04-23 | 2010-08-25 | 华北电力大学 | Method for manufacturing transient high-frequency magnetic field of power system |
| US20110273121A1 (en) * | 2010-05-04 | 2011-11-10 | Remy Technologies, Llc | Electric Machine Component Temperature Monitoring |
| CN202305048U (en) * | 2011-10-31 | 2012-07-04 | 莱芜科泰电力科技有限公司 | On-line monitoring device for high voltage cable |
| CN202734974U (en) * | 2012-06-20 | 2013-02-13 | 江苏常牵庞巴迪牵引系统有限公司 | Temperature on-line monitoring device for motor rotor |
| CN202956217U (en) * | 2012-12-06 | 2013-05-29 | 西安工程大学 | Primary equipment temperature on-line monitoring system for concentrative intelligent substation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110530546A (en) * | 2019-08-16 | 2019-12-03 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of temperature sampling circuit |
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