CN113218298B - Eccentric phase angle measuring device based on distributed control system and measuring method thereof - Google Patents
Eccentric phase angle measuring device based on distributed control system and measuring method thereof Download PDFInfo
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Abstract
The invention discloses an eccentric phase angle measuring device and method based on a distributed control system. The eccentric phase angle measuring method comprises the following steps: when the steam turbine rotating shaft rotates, monitoring a key phase current signal and an eccentric current signal in real time, and measuring the rotation period of the steam turbine rotating shaft and the eccentric time of the steam turbine rotating shaft from the same timing starting point, wherein the eccentric time is the accumulated time from the timing starting point to the time when the maximum eccentric signal is detected; calculating to obtain an eccentric angle of the steam turbine rotating shaft according to the eccentric time and the rotation period of the steam turbine rotating shaft, wherein the eccentric angle is a rotation angle of a maximum eccentric point of the steam turbine rotating shaft in the eccentric time along the rotation direction; and calculating a second included angle of the maximum eccentric point and the mark point in the rotation direction according to the eccentric angle and the acquired first included angle to serve as an eccentric phase angle, so that the eccentric state of the rotating shaft of the steam turbine is monitored online in real time, and the detection cost is reduced.
Description
Technical Field
The invention belongs to the technical field of online monitoring of a steam turbine, and particularly relates to an eccentric phase angle measuring device based on a distributed control system, a measuring method thereof, a computer readable storage medium and computer equipment.
Background
The TSI system (Turbine monitoring system, turbine Supervisory Instruments, TSI for short) of the thermal power plant at the present stage monitors, alarms and trips various protections of the Turbine through various probes on site, wherein an eccentric signal provided by the TSI system is only an absolute monitoring signal, and an eccentric relative phase angle required to be acquired is analyzed and monitored by a TDM vibration analysis system (turbo vibration monitoring MANAGEMENT, TDM for short), belongs to temporary monitoring, and is not convenient for real-time online monitoring of a phase angle. If a DCS system provides a real-time monitoring signal of the relative phase angle of eccentricity and vibration, great help can be provided for dynamic balance analysis, fault analysis and diagnosis of a turbine shaft.
Disclosure of Invention
(I) technical problems to be solved by the invention
The technical problem solved by the invention is as follows: how to realize the real-time online measurement of the eccentric phase angle of the rotating shaft of the steam turbine.
(II) the technical scheme adopted by the invention
An eccentric phase angle measurement method based on a distributed control system, which is used for measuring an eccentric phase angle of a steam turbine rotating shaft, wherein the steam turbine rotating shaft is provided with mark points, and the eccentric phase angle measurement method comprises the following steps:
when a steam turbine rotating shaft rotates, monitoring a key phase current signal and an eccentric current signal in real time, and measuring the rotation period of the steam turbine rotating shaft and the eccentric time of the steam turbine rotating shaft from the same timing starting point, wherein the eccentric time is the accumulated time from the timing starting point to the time when the maximum eccentric signal is detected;
calculating to obtain an eccentric angle of the steam turbine rotating shaft according to the eccentric time and the rotation period of the steam turbine rotating shaft, wherein the eccentric angle is a rotation angle of a maximum eccentric point of the steam turbine rotating shaft in the eccentric time along the rotation direction;
and calculating a second included angle between the maximum eccentric point and the mark point in the rotation direction according to the eccentric angle and the acquired first included angle, wherein the second included angle is used as an eccentric phase angle, and the first included angle is an included angle between a projection point of the eccentric signal probe on the steam turbine rotating shaft and the mark point in the rotation direction at the starting point of timing.
Preferably, the mark point is a key phase groove formed on the steam turbine rotating shaft, and the method for measuring the rotation period of the steam turbine rotating shaft comprises the following steps:
when the rotating shaft of the steam turbine rotates, the alignment moment of the key phase slot and the key phase signal probe is used as a timing starting point, the key phase signal accumulation time is counted until the key phase slot and the key phase signal probe are aligned again, and the counted key phase signal accumulation time is used as the rotating period of one circle of rotation of the rotating shaft of the steam turbine.
Preferably, in step S10, the calculation formula of the eccentric angle is:
wherein alpha is an eccentric angle, T is a rotation period, and T is an eccentric time.
Preferably, the rotation direction is clockwise, and when the eccentric angle is smaller than or equal to the first included angle, the calculation formula of the second included angle is as follows:
θ 2 ＝θ 1 -α，
wherein, theta 2 Is a second angle theta 1 Is a first included angle.
Preferably, when the eccentric angle is larger than the first included angle, the calculation formula of the second included angle is as follows:
θ 2 ＝360°-α+θ 1 。
the application also discloses eccentric phase angle measuring device based on distributed control system for measure the eccentric phase angle of steam turbine pivot, the steam turbine pivot has the mark point, and eccentric phase angle measuring device includes:
the key phase signal detection module is used for detecting a key phase current signal when the rotating shaft of the steam turbine rotates;
the eccentric signal detection module is used for detecting an eccentric current signal when the rotating shaft of the steam turbine rotates;
the signal processing module based on distributed control system includes:
the counting unit is used for receiving the key phase current signal and the eccentric current signal, counting the rotation period of the steam turbine rotating shaft according to the key phase current signal from the same timing starting point, and counting the eccentric time of the steam turbine rotating shaft according to the eccentric current signal;
a calculating unit, configured to calculate an eccentric angle of the steam turbine rotating shaft according to the eccentric time and the rotation period, where the eccentric angle is a rotation angle of a maximum eccentric point of the steam turbine rotating shaft in an eccentric time along a rotation direction, and
and calculating a second included angle between the maximum eccentric point and the mark point in the rotation direction according to the eccentric angle and the acquired first included angle, and taking the second included angle as an eccentric phase angle, wherein the first included angle is an included angle between the projection point of the eccentric signal probe on the steam turbine rotating shaft and the mark point in the rotation direction at the starting point of timing.
Preferably, the mark point is a key phase groove formed in the steam turbine rotating shaft, the key phase signal detection module includes a key phase signal probe, a first pre-processor and a first converter, which are connected in sequence, the key phase signal probe is used for detecting a key phase voltage signal when the steam turbine rotating shaft rotates, the first pre-processor is used for transmitting the key phase voltage signal to the first converter, and the key phase voltage signal is converted into a key phase current signal by the first converter.
Preferably, the eccentric signal detection module comprises an eccentric signal probe, a second prepositive device and a second converter which are connected in sequence, wherein the eccentric signal probe is used for detecting an eccentric voltage signal when the rotating shaft of the steam turbine rotates, the second prepositive device is used for transmitting the eccentric voltage signal to the second converter, and the second converter is used for converting the eccentric voltage signal into an eccentric current signal.
The application also discloses a computer readable storage medium, which stores the eccentric phase angle measurement program based on the distributed control system, and the eccentric phase angle measurement program based on the distributed control system is executed by a processor to realize the eccentric phase angle measurement method based on the distributed control system.
The present application also discloses a computer device comprising a computer readable storage medium, a processor and a distributed control system based eccentric phase angle measurement program stored in the computer readable storage medium, wherein the distributed control system based eccentric phase angle measurement program when executed by the processor implements the distributed control system based eccentric phase angle measurement method described above.
(III) advantageous effects
The invention discloses an eccentric phase angle measuring method based on a distributed control system, which has the following technical effects compared with the traditional measuring method:
based on the distributed control system, the key phase current signal and the eccentric current signal of the steam turbine rotating shaft during rotation are monitored and monitored in real time, the rotation period of the steam turbine rotating shaft and the eccentric time of the steam turbine rotating shaft are detected according to the key phase current signal and the eccentric current signal respectively, so that the eccentric phase angle of the maximum eccentric point and the mark point in the rotation direction is further calculated, the position of the maximum eccentric point can be determined, the eccentric state of the steam turbine rotating shaft is monitored in real time on line, and meanwhile, the detection cost is reduced.
Drawings
FIG. 1 is a flow chart of an eccentric phase angle measurement method based on a distributed control system according to an embodiment of the present invention;
FIG. 2 is an overall architecture diagram of an eccentric phase angle measuring device based on a distributed control system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the distribution of the maximum eccentricity points of an embodiment of the present invention;
FIG. 4 is another schematic diagram of the distribution of points of maximum eccentricity for an embodiment of the present invention;
FIG. 5 is a schematic diagram of a computer apparatus according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Before describing in detail the various embodiments of the present application, the inventive concepts of the present application are first briefly described: in the existing eccentric phase angle measuring scheme, an external device TDM system is generally utilized for temporary measurement, extra equipment needs to be purchased, the cost is high, the measurement is usually carried out when a fault occurs, and the real-time performance is poor. This application is based on distributed control system, key phase current signal and eccentric current signal when real-time supervision steam turbine pivot rotates, and the eccentric time of the rotation cycle of starting to measure steam turbine pivot and steam turbine pivot from same timing starting point, according to steam turbine pivot eccentric time with the rotation cycle calculation obtains the eccentric angle of steam turbine pivot to and further according to eccentric angle and the first contained angle calculation that acquires maximum eccentric point with mark point second contained angle on the direction of rotation is as eccentric phase angle, like this according to the position of mark point alright confirm maximum eccentric point place position to carry out the dynamic balance adjustment of steam turbine shaft, can monitor eccentric phase angle on line in real time like this, do benefit to and carry out failure analysis.
As shown in fig. 1 and fig. 2, the method for measuring an eccentric phase angle based on a distributed control system of the first embodiment includes the following steps:
step S10: when a steam turbine rotating shaft rotates, monitoring a key phase current signal and an eccentric current signal in real time, and measuring the rotation period of the steam turbine rotating shaft and the eccentric time of the steam turbine rotating shaft from the same timing starting point, wherein the eccentric time is the accumulated time from the timing starting point to the time when the maximum eccentric signal is detected;
step S20: calculating to obtain an eccentric angle of the steam turbine rotating shaft according to the eccentric time and the rotation period of the steam turbine rotating shaft, wherein the eccentric angle is a rotation angle of a maximum eccentric point of the steam turbine rotating shaft in the eccentric time along the rotation direction;
step S30: and calculating a second included angle between the maximum eccentric point and the mark point in the rotation direction according to the eccentric angle and the acquired first included angle, wherein the second included angle is used as an eccentric phase angle, and the first included angle is an included angle between a projection point of the eccentric signal probe on the steam turbine rotating shaft and the mark point in the rotation direction at the starting point of timing.
In a preferred embodiment, the marked point is a key phase slot formed on the steam turbine rotating shaft 10, a key phase signal probe 101 is installed at a position opposite to the key phase slot, and the method for measuring the rotation period of the steam turbine rotating shaft comprises the following steps: when the steam turbine rotating shaft 10 rotates, the alignment time of the key phase slot and the key phase signal probe 101 is used as a timing starting point, namely, the detected key phase pulse signal is used as the timing starting point, the key phase signal accumulation time is counted until the key phase slot and the key phase signal probe 101 are aligned again, and the counted key phase signal accumulation time is used as a rotating period of one rotation of the steam turbine rotating shaft 10.
Further, while determining the timing start point, the statistical counting of the cumulative time from the timing start point to the time when the maximum eccentricity signal is detected by the eccentricity signal probe 201 is started as the eccentricity time. It should be noted that when the maximum eccentric point passes through the eccentric signal probe 201, the eccentric signal probe 201 detects the maximum eccentric signal, and the maximum eccentric point is aligned with the eccentric signal probe 201.
Specifically, the statistical method of the rotation period and the eccentricity time is as follows: the scanning period of the distributed control system is used as a time unit, the number of the scanning periods is counted in the period of aligning the key phase slot and the key phase signal probe 101 for two times, and the number of the scanning periods is multiplied by the scanning period, so that the rotation period is obtained. Similarly, the number of scanning cycles from the beginning of timing to the detection of the maximum eccentricity signal by the eccentricity signal probe 201 is counted, and the eccentricity time is obtained by multiplying the number of scanning cycles by the scanning cycle. Compared with the traditional timing module in the distributed control system, the scanning period of the distributed control system is taken as the time unit, the scanning period is 0.02 second, the time precision of the traditional timing module is 1 second, and the embodiment can realize higher-precision time statistics, especially for a rotating shaft with high rotating speed, so that the position of the maximum eccentric point can be determined more accurately.
Further, in step S20, the calculation formula of the eccentric angle is:
wherein alpha is an eccentric angle, T is a rotation period, and T is an eccentric time.
In step S30, the rotation direction is a clockwise direction, the first included angle is an included angle between a radius of the mark point and a radius of a projection point of the eccentric signal probe on the steam turbine rotating shaft along the rotation direction when the timing start point is reached, and when the eccentric angle is smaller than or equal to the first included angle, the calculation formula of the second included angle is as follows:
θ 2 ＝θ 1 -α，
wherein, theta 2 Is a second angle theta 1 Is a first included angle.
When the eccentric angle is larger than the first included angle, the calculation formula of the second included angle is as follows:
θ 2 ＝360°-α+θ 1 。
illustratively, as shown in FIG. 3, assume θ 1 =270 °, α =180 °, in which case θ is known 2 ＝θ 1 -α＝270°-180°＝90°。θ 1 =270 ° represents an angle between the key phase signal probe 101 and the eccentric signal probe 201, α =180 ° represents an angle between the maximum eccentric point and the projected point of the eccentric signal probe 201 at the start of timing, and θ 2 The angle of the maximum eccentricity point with respect to the key phase signal probe 101 is =90 °, that is, at the start of timing, the angle between the maximum eccentricity point and the key phase slot is 90 °, and since the position of the key phase slot is determined, the position of the maximum eccentricity point can be further determined.
Illustratively, as shown in FIG. 4, assume θ 1 =270 °, α =300 °, in which case θ is known 2 ＝360°-α+θ 1 =360 ° -300 ° +270 ° =330 °, α =300 ° denotes the angle between the maximum eccentricity point and the projection point of the eccentric signal probe 201 at the start of the timing, θ 2 =330 ° represents the angle between the maximum eccentric point and the key phase signal probe 101, that is, at the start of timing, the angle between the maximum eccentric point and the key phase slot is 330 °, and since the position of the key phase slot is determined, the position of the maximum eccentric point can be further determined.
The method for measuring the eccentric phase angle based on the distributed control system according to the embodiment is based on the distributed control system, and monitors the key phase current signal and the eccentric current signal of the steam turbine rotating shaft in real time when the steam turbine rotating shaft rotates, and detects the rotation period of the steam turbine rotating shaft and the eccentric time of the steam turbine rotating shaft according to the key phase current signal and the eccentric current signal respectively, so that the eccentric phase angle of the maximum eccentric point and the mark point in the rotation direction is further calculated, the position of the maximum eccentric point can be determined, the eccentric state of the steam turbine rotating shaft is monitored in real time on line, and meanwhile, the detection cost is reduced.
Further, as shown in fig. 2, the second embodiment provides an eccentric phase angle measuring device based on a distributed control system, the eccentric phase angle measuring device includes a key phase signal detecting module, an eccentric signal detecting module and a signal processing module based on the distributed control system, and the signal processing module based on the distributed control system includes a statistical unit 301 and a calculating unit 302. The key phase signal detection module is used for detecting a key phase current signal when the rotating shaft of the steam turbine rotates; the eccentric signal detection module is used for detecting an eccentric current signal when the rotating shaft of the steam turbine rotates; the statistical unit 301 is configured to receive the key phase current signal and the eccentric current signal, and count a rotation period of the steam turbine rotating shaft according to the key phase current signal and count an eccentric time of the steam turbine rotating shaft according to the eccentric current signal from the same timing starting point. The calculating unit 302 is configured to calculate an eccentric angle of the steam turbine rotating shaft according to the eccentric time and the rotation period, where the eccentric angle is a rotation angle of a maximum eccentric point of the steam turbine rotating shaft in the eccentric time along the rotation direction, and calculate a second included angle between the maximum eccentric point and the mark point in the rotation direction as an eccentric phase angle according to the eccentric angle and an obtained first included angle, where the first included angle is an included angle between a projection point of the eccentric signal probe on the steam turbine rotating shaft and the mark point in the rotation direction at a timing starting point.
Specifically, the marked point is a key phase slot formed in the steam turbine rotating shaft, the key phase signal detection module comprises a key phase signal probe 101, a first pre-processor 102 and a first converter 103 which are connected in sequence, the key phase signal probe 101 is used for detecting a key phase voltage signal when the steam turbine rotating shaft rotates, the first pre-processor 102 is used for transmitting the key phase voltage signal to the first converter 103, and the key phase voltage signal is converted into a key phase current signal through the first converter 103.
Further, the eccentric signal detection module comprises an eccentric signal probe 201, a second pre-positioning device 202 and a second converter 203 which are connected in sequence, the eccentric signal probe is used for detecting an eccentric voltage signal when the rotating shaft of the steam turbine rotates, and the second pre-positioning device 202 is used for transmitting the eccentric voltage signal to the second converter 203 and converting the eccentric voltage signal into an eccentric current signal through the second converter 202.
In the signal processing module based on the distributed control system, the statistical unit 301 includes a determiner, an accumulation timer and a large value scanner, for example, when the determiner detects that the value of the key phase current signal is greater than 70, the determiner triggers the accumulation timer and the large value scanner to operate simultaneously when the determiner starts timing, the large value scanner performs accumulation timing with a scanning period of 50ms, and the time when the large value scanner accumulates to the maximum eccentricity signal is the eccentricity time. When the accumulated timer is accumulated to the next key phase signal trigger, the rotation period of one circle of rotation of the rotor is calculated. Further, referring to the method of the first embodiment, the eccentric angle is calculated according to the eccentric time and the rotation period, and the eccentric phase angle is further calculated.
In the actual measurement process, 2 DC24V current-voltage conversion modules are prepared and installed in a TSI cabinet on a production site, 24vdc power supplies are respectively provided for the conversion modules by utilizing the 24vdc power supplies in a TSI system, eccentric voltage signals and key phase voltage signals which are sent into the TSI system on the site are respectively transmitted into the 24vdc current-voltage conversion modules and are converted into 4-20mA current signals which are sent into an AI card of the DCS system for signal acquisition. And manually turning, observing the current value when the key phase signal probe detects the key phase slot, performing logic configuration on a DCS (distributed control system), and setting the current threshold as a judging and timing condition of the key phase detection signal. Firstly, the judgment logic of the key phase signal is configured by the key phase signal current threshold value, the time period logic of one circle of the rotor is calculated by starting the key phase signal, then the judgment logic of the maximum eccentric current value is calculated by the eccentric signal configuration, and then the eccentric phase angle is calculated by integrating the logic configurations.
The third embodiment of the present application further discloses a computer-readable storage medium, in which the distributed control system based eccentric phase angle measurement program is stored, and when executed by a processor, the distributed control system based eccentric phase angle measurement program implements the distributed control system based eccentric phase angle measurement method.
Another embodiment of the present application also discloses a computer device, and on a hardware level, as shown in fig. 5, the terminal includes a processor 12, an internal bus 13, a network interface 14, and a computer-readable storage medium 11. The processor 12 reads a corresponding computer program from the computer-readable storage medium and then runs, forming a request processing apparatus on a logical level. Of course, besides software implementation, the one or more embodiments in this specification do not exclude other implementations, such as logic devices or combinations of software and hardware, and so on, that is, the execution subject of the following processing flow is not limited to each logic unit, and may also be hardware or logic devices. The computer-readable storage medium 11 has stored thereon a distributed control system-based eccentricity phase angle measurement program that, when executed by a processor, implements the distributed control system-based eccentricity phase angle measurement method described above.
Computer-readable storage media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer-readable storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic disk storage, quantum memory, graphene-based storage media or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.
Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (9)
1. An eccentric phase angle measurement method based on a distributed control system, which is used for measuring an eccentric phase angle of a steam turbine rotating shaft, wherein the steam turbine rotating shaft is provided with mark points, and the eccentric phase angle measurement method comprises the following steps:
when a steam turbine rotating shaft rotates, monitoring a key phase current signal and an eccentric current signal in real time, and measuring the rotation period of the steam turbine rotating shaft and the eccentric time of the steam turbine rotating shaft from the same timing starting point, wherein the eccentric time is the accumulated time from the timing starting point to the time when the maximum eccentric signal is detected; the mark point is a key phase groove formed in the steam turbine rotating shaft, and the method for measuring the rotation period of the steam turbine rotating shaft comprises the following steps: when the rotating shaft of the steam turbine rotates, taking the alignment moment of the key phase slot and the key phase signal probe as a timing starting point, starting to count the key phase signal accumulation time until the key phase slot and the key phase signal probe are aligned again, and taking the counted key phase signal accumulation time as the rotation period of one circle of rotation of the rotating shaft of the steam turbine; the statistical method of the rotation period comprises the following steps: the method comprises the steps that the scanning period of a distributed control system is used as a time unit, the number of the scanning periods is counted in the period of aligning a key phase groove and a key phase signal probe for two times, and the number of the scanning periods is multiplied by the scanning period to obtain a rotation period; the statistical method of the eccentricity time comprises the following steps: counting the number of scanning periods of the eccentricity signal probe in the period from the starting point of timing to the maximum eccentricity signal detection, and multiplying the number of the scanning periods by the scanning period to obtain eccentricity time;
calculating to obtain an eccentric angle of the steam turbine rotating shaft according to the eccentric time and the rotation period of the steam turbine rotating shaft, wherein the eccentric angle is a rotation angle of a maximum eccentric point of the steam turbine rotating shaft in the eccentric time along the rotation direction;
and calculating a second included angle between the maximum eccentric point and the mark point in the rotation direction according to the eccentric angle and the acquired first included angle, wherein the second included angle is used as an eccentric phase angle, and the first included angle is an included angle between a projection point of the eccentric signal probe on the steam turbine rotating shaft and the mark point in the rotation direction at the starting point of timing.
2. The method for measuring an eccentric phase angle based on a distributed control system according to claim 1, wherein in step S10, the calculation formula of the eccentric angle is:
wherein alpha is an eccentric angle, T is a rotation period, and T is an eccentric time.
3. The method of claim 2, wherein the rotation direction is clockwise, and when the eccentric angle is less than or equal to the first angle, the second angle is calculated by the following formula:
θ 2 ＝θ 1 -α，
wherein, theta 2 Is a second angle theta 1 Is a first included angle.
4. The method of claim 3, wherein when the eccentric angle is larger than the first angle, the second angle is calculated by the following formula:
θ 2 ＝360°-α+θ 1 。
5. an eccentric phase angle measuring device based on a distributed control system, which is used for measuring the eccentric phase angle of a steam turbine rotating shaft, wherein the steam turbine rotating shaft is provided with a mark point, and the eccentric phase angle measuring device comprises:
the key phase signal detection module is used for detecting a key phase current signal when the rotating shaft of the steam turbine rotates;
the eccentric signal detection module is used for detecting an eccentric current signal when the rotating shaft of the steam turbine rotates;
the signal processing module based on distributed control system includes:
the counting unit is used for receiving the key phase current signal and the eccentric current signal, counting the rotation period of the steam turbine rotating shaft according to the key phase current signal from the same timing starting point, and counting the eccentric time of the steam turbine rotating shaft according to the eccentric current signal; the mark point is a key phase groove formed in the steam turbine rotating shaft, and the method for measuring the rotation period of the steam turbine rotating shaft comprises the following steps: when the rotating shaft of the steam turbine rotates, taking the alignment moment of the key phase slot and the key phase signal probe as a timing starting point, starting to count the key phase signal accumulation time until the key phase slot and the key phase signal probe are aligned again, and taking the counted key phase signal accumulation time as the rotation period of one circle of rotation of the rotating shaft of the steam turbine; the statistical method of the rotation period comprises the following steps: the method comprises the steps that the scanning period of a distributed control system is used as a time unit, the number of the scanning periods is counted in the period of aligning a key phase groove and a key phase signal probe for two times, and the number of the scanning periods is multiplied by the scanning period to obtain a rotation period; the statistical method of the eccentricity time comprises the following steps: counting the number of scanning periods of the eccentricity signal probe in the period from the starting point of timing to the maximum eccentricity signal detection, and multiplying the number of the scanning periods by the scanning period to obtain eccentricity time;
a calculating unit, configured to calculate an eccentric angle of the steam turbine rotating shaft according to the eccentric time and the rotation period, where the eccentric angle is a rotation angle of a maximum eccentric point of the steam turbine rotating shaft in an eccentric time along a rotation direction, and
and calculating a second included angle between the maximum eccentric point and the mark point in the rotation direction according to the eccentric angle and the acquired first included angle, and taking the second included angle as an eccentric phase angle, wherein the first included angle is an included angle between the projection point of the eccentric signal probe on the steam turbine rotating shaft and the mark point in the rotation direction at the starting point of timing.
6. The distributed control system based eccentric phase angle measuring device according to claim 5, wherein the key phase signal detecting module comprises a key phase signal probe, a first pre-positioning device and a first converter which are connected in sequence, the key phase signal probe is used for detecting a key phase voltage signal when a rotating shaft of the steam turbine rotates, and the first pre-positioning device is used for transmitting the key phase voltage signal to the first converter and converting the key phase voltage signal into a key phase current signal through the first converter.
7. The distributed control system based eccentric phase angle measuring device according to claim 5, wherein the eccentric signal detecting module comprises an eccentric signal probe, a second pre-positioning device and a second converter, which are connected in sequence, the eccentric signal probe is used for detecting an eccentric voltage signal when a rotating shaft of the steam turbine rotates, and the second pre-positioning device is used for transmitting the eccentric voltage signal to the second converter and converting the eccentric voltage signal into an eccentric current signal through the second converter.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a distributed control system-based eccentricity phase angle measurement program that, when executed by a processor, implements the distributed control system-based eccentricity phase angle measurement method according to any one of claims 1 to 4.
9. A computer device comprising a computer readable storage medium, a processor, and a distributed control system based eccentric phase angle measurement program stored in the computer readable storage medium, wherein the distributed control system based eccentric phase angle measurement program when executed by the processor implements the distributed control system based eccentric phase angle measurement method of any one of claims 1 to 4.
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| CZ2011588A3 (en) * | 2011-09-21 | 2013-06-12 | Doosan Skoda Power S.R.O. | Method of determining actual eccentricity of a rotating rotor and rotating rotor eccentricity diagnostics |
| CN102645270A (en) * | 2012-05-04 | 2012-08-22 | 北京化工大学 | Intelligent dual-mode vibration sensor for rotary machinery |
| CN106017903B (en) * | 2016-07-14 | 2018-09-07 | 贵州电网有限责任公司电力科学研究院 | A kind of steam-electric generating set shafting is eccentric and its phase measurement device and method |
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