JP2004257955A - Remote status monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a remote status monitoring system that can surely perform remote monitoring by surely obtaining data at a minimum cost in DSS operation. <P>SOLUTION: The remote status monitoring system comprises a monitor signal detecting sensor 3 detecting the monitor signal of a rotary machine 2, a filed monitoring device 5 measuring the monitor signal from the detecting sensor 3 to monitor the operation state of the rotary machine 2 based on this measured monitor signal and a decision value, and a monitoring server 7 receiving the monitor signal measured from the filed monitoring device 5 via a public line 6. The filed monitoring device 5 has a CPU 51 and a plurality of decision values classified corresponding to the degrees of abnormalities; transmits emergency alarms to the monitoring server 7 when it compares the measured monitor signals with a plurality of decision values by the CPU 51 and the measured monitor signals exceed a maximum value of a plurality of decision values; controls the transmitting interval of the measured monitor signals to the monitoring server 7 based on the compared results by a plurality of decision values. Consequently, the weak point is resolved, which is caused from the lack of a quality appearance as a clock dial due to the unsharpened top ends on the recess of the clock dial when producing the clock dial with a surface having formed uneven shaped patterns by injection molding. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a remote status monitoring system in which a site monitoring device provided in a rotating machine and a monitoring server at a remote location are connected via a public line. A CPU is provided in the on-site monitoring device, the measured partial discharge data of the rotating machine is compared with the determination value, and based on the result, an alarm is issued by an abnormality determination, and the partial discharge measurement time is determined according to the insulation deterioration state. The present invention relates to a remote state monitoring system having a function of performing determination and execution.
[0002]
[Prior art]
The conventional system includes a detector 50 in which sensors for obtaining various types of information are arranged, an on-site panel 1000 that processes these detection amounts, determines an abnormal value, performs a partial diagnosis, and transmits the result to a higher-level diagnostic device. A transmission unit 2000 for transmitting a signal from the remote site to a remote place, and a main building panel 3000 for processing the transmitted signal and performing comprehensive diagnosis (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent No. 2751834 (pages 3-4, FIG. 1)
[0004]
[Problems to be solved by the invention]
Since the conventional system as described above is large-scale and expensive, there is a problem in that it is expensive to install and monitor on a large number of electric motors located far from each other.
[0005]
In addition, since data is transmitted by cable, there is a problem that it is difficult to remotely monitor a device at a place tens to hundreds of kilometers away from the head office.
[0006]
Further, there is a problem that it is difficult to efficiently monitor the state of the rotating machine that repeatedly starts and stops.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a remote monitoring system capable of reliably obtaining data at a minimum cost and performing remote monitoring reliably in DSS operation. A condition monitoring system is obtained.
[0008]
[Means for Solving the Problems]
A remote state monitoring system according to the present invention is installed on a rotating machine, and detects a monitoring sensor for detecting a monitoring signal of the rotating machine, and measures a monitoring signal from the detection sensor, and based on the measured monitoring signal and a determination value. And a monitoring server that receives the measured monitoring signal from the site monitoring device via a public line. The on-site monitoring device has a control unit and a plurality of pre-registered judgment values that are classified according to the degree of abnormality, and the control unit compares the measured monitoring signal with the plurality of judgment values. When the measured monitoring signal exceeds the maximum value among the plurality of determination values, an abnormal alarm is transmitted to the monitoring server, and the monitoring server sends the abnormality signal to the monitoring server based on a comparison result based on the plurality of determination values. It controls the transmission interval of the measured monitoring signal.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
A remote status monitoring system according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a remote status monitoring system according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing a configuration of a site monitoring device of the remote status monitoring system according to the first embodiment of the present invention. In the drawings, the same reference numerals indicate the same or corresponding parts.
[0010]
In FIG. 1, a remote state monitoring system 1 according to the first embodiment includes a monitoring signal detection sensor 3 installed on a rotating machine 2, a CT power supply 4 installed on a driving bus of the rotating machine 2, and a site monitoring device 5. And a monitoring server 7 connected to the site monitoring device 5 through a public line 6. The CT power supply 4 obtains electric power by a current transformer (CT) provided on a driving bus of the rotating machine 2, rectifies the electric power, and supplies the electric power to the on-site monitoring device 5.
[0011]
Also, in the figure, the monitoring server 7 includes a communication module 71 and a notebook computer 72.
[0012]
2, the site monitoring device 5 includes a CPU (control means) 51, a detection circuit 52, an A / D conversion circuit 53, a memory 54, and a communication module 55.
[0013]
Next, the operation of the remote status monitoring system according to the first embodiment will be described with reference to the drawings.
[0014]
FIG. 3 is a flowchart showing the operation of the remote status monitoring system according to Embodiment 1 of the present invention.
[0015]
The remote state monitoring system 1 monitors an operation state of the rotating machine 2. The site monitoring device 5 uses a detection circuit 52 to measure a monitoring signal obtained by a monitoring signal detection sensor 3 provided in the rotating machine 2. This monitoring signal is a partial discharge (PD). The measured monitoring signal is converted into a digital signal by the A / D conversion circuit 53 and stored in the memory 54. The detection circuit 52, the A / D conversion circuit 53, and the memory 54 are controlled by the CPU 51.
[0016]
The specific operation will be described with reference to the flowchart shown in FIG. The rotating machine 2 is a high-voltage motor here. When the high-voltage motor 2 is started (step 101), the CT power supply 4 provided on the drive bus is driven, and power is supplied to the site monitoring device 5 (step 102). As a result, the CPU 51 of the site monitoring device 5 is driven (step 103), and a PD detection start command is issued from the CPU 51 to the detection circuit 52 to measure the PD (step 104).
[0017]
Next, the measured PD is A / D converted by the A / D conversion circuit 53 and stored in the memory 54 (step 105). Thereafter, under the control of the CPU 51, the measured value is compared with a pre-registered judgment value (steps 106 to 107). If the measured value exceeds the judgment value, the communication module 55 is used to rotate the monitoring server 7. An alarm indicating that the monitoring information (measured value) of the device 2 exceeds the determination level (determined value) is transmitted (step 108).
[0018]
Thereafter, the measured value is transmitted to the monitoring server 7 (Step 109). Here, the registered determination value is a PD intensity of 250 mV. In the first embodiment, the PD detection band has a center frequency of 10 MHz and a bandwidth of 3 MHz in order to improve the S / N ratio.
[0019]
On the other hand, since the monitoring server 7 is in the PHS standby state in the activated state (step 121), when the warning is received (step 122), the warning is transmitted to the administrator of the rotating machine 2 (step 123). Thereafter, the data is received (step 124) and stored in the database (step 125).
[0020]
The site monitoring device 5 repeats the PD measurement at a set predetermined time interval (step 110). If the measured value exceeds the determination value, an alarm is issued and the data is transmitted. If the measured value does not exceed the judgment value, only the data (measured value) is transmitted. In the case of the rotating machine 2, since the time from the measurement of the abnormality sign to the accident is long, the monitoring effect is sufficient even if the measurement is not performed at all times but is performed at regular time intervals.
[0021]
Also, for example, it is needless to say that the measurement can be performed at intervals of 5 minutes, the measured value> the determination value can be compared, and the control can be performed such that the data transmission is performed every hour if the measured value is not exceeded.
[0022]
By performing such control, in the case of DSS operation (an operation method in which starting and stopping are repeated every day because operation is performed only when power is required at a power plant or the like), data can be reliably obtained at a minimum cost and remote control can be performed. Monitoring can be performed reliably.
[0023]
Even if the monitoring server 7 specifies a time and issues a measurement command to the site monitoring device 5, an effective measurement result cannot be obtained if the rotating machine 2 has stopped operating. It is also possible to first program the monitoring server software so as to grasp the operating state of each rotating machine 2 and measure it while the rotating machine 2 is running. If it gets messy.
[0024]
Furthermore, when the rotating machine 2 is started, the starting current often flows several times to several tens times as compared with the steady state, so that the electromagnetic vibration increases. Therefore, automatically measuring the PD at the time of startup is very effective for state monitoring. This is made possible by providing the site monitoring device 5 with the CPU 51.
[0025]
Embodiment 2 FIG.
Embodiment 2 A remote state monitoring system according to Embodiment 2 of the present invention will be described with reference to the drawings. The configuration of the remote status monitoring system according to the second embodiment of the present invention is the same as that of the first embodiment.
[0026]
FIG. 4 is a flowchart showing the operation of the site monitoring device of the remote status monitoring system according to Embodiment 2 of the present invention. FIG. 5 is a diagram showing a determination level of the site monitoring device of the remote status monitoring system according to Embodiment 2 of the present invention.
[0027]
The operations up to the point where the high-voltage motor 2 is driven and the site monitoring device 5 measures the PD and stores the data (steps 201 to 205) are the same as those in the first embodiment.
[0028]
After storing the PD data, the CPU 51 of the site monitoring device 5 determines the level of the PD. This PD level determination is performed based on three reference determination levels (determination values 1 to 3). The determination level according to the second embodiment is as shown in FIG. 5, and is determined based on the measurement results of about 150 actual devices accumulated up to now.
[0029]
The degree of insulation deterioration is grasped based on the PD level corresponding to the determination level, the partial discharge (PD) is measured according to the degree of insulation deterioration, and the signal transmission interval to the monitoring server 7 is controlled. The monitoring server 7 remotely monitors many motors 2 based on the data transmitted from the site monitoring device 5.
[0030]
That is, in steps 206 to 207 and 213, the site monitoring device 5 determines whether the measured value is larger than the determination value 1 (500 mV). Is transmitted, and then the data (measured value) is transmitted. On the other hand, if it is not large, the process proceeds to the next step 208.
[0031]
Next, in steps 208 to 209 and 213, it is determined whether or not the measured value is larger than the determination value 2 (250 mV). At interval 1, data (measured values) are transmitted. On the other hand, if it is not large, the process proceeds to the next step 210.
[0032]
Next, in Steps 210 to 213, it is determined whether or not the measured value is larger than the determination value 3 (100 mV). If the measured value is larger than the signal transmission time, the data is transmitted to the monitoring server 7 at the transmission interval 2 of one week. (Measured value). On the other hand, when the signal transmission time is not large (100 mV or less) and the signal transmission time is reached, data (measurement value) is transmitted at a transmission interval of one month.
[0033]
When one monitoring server 7 monitors the status of hundreds to thousands of rotating machines 2, the monitoring frequency of the rotating machines 2 whose insulation has deteriorated is increased, and the monitoring of the rotating machines 2 whose deterioration has not progressed is increased. By reducing the frequency, it is possible to perform cost-effective monitoring.
[0034]
Embodiment 3 FIG.
Embodiment 3 A remote state monitoring system according to Embodiment 3 of the present invention will be described with reference to the drawings. The configuration of the remote status monitoring system according to Embodiment 3 of the present invention is the same as that of Embodiment 1 except for the following.
[0035]
FIG. 6 is a flowchart showing the operation of the remote status monitoring system according to Embodiment 3 of the present invention. FIG. 7 is a diagram showing a measurement interval determination value of the site monitoring device of the remote status monitoring system according to Embodiment 3 of the present invention.
[0036]
A large-capacity memory is used as the memory 54 of the site monitoring device 5. In the third embodiment, the measurement resolution is 250 μs, and the maximum value of the pulse generated within this time and the time are stored in the memory 54. The pulse maximum value is A / D converted at a 12-bit resolution. To measure this for one minute, a memory 54 for storing a maximum of 480,000 data is provided. The memory capacity is related to the number of data of the monitoring signal. In the case of a PD having a large number of data, it is related to the measurement resolution of the site monitoring device 5. In the third embodiment, the measurement is performed for one minute. However, the measurement time is determined by the time for grasping the abnormal degradation precursor phenomenon described later, and when the measurement time is increased, the memory capacity increases. When the measurement resolution is smaller than 250 μs, the memory capacity needs to be large even if the measurement time is shorter than 1 minute.
[0037]
The third embodiment is an apparatus capable of detecting an abnormality in the rotating machine 2 when the abnormality occurs, issuing a device operation stop command, and grasping a precursory phenomenon of the abnormality.
[0038]
The operations from the start of the motor 2 to the measurement of the PD and the storage of the data (steps 301 to 305) are the same as those in the first embodiment.
[0039]
In the third embodiment, since the PD measurement time is one minute, it is longer than in the first embodiment. Therefore, data storage takes time. Data _is stored is divided into n (a natural number) to T 1 through T _n. This n is measured seconds for convenience. Therefore, in the third embodiment, to measure up data _T 1 _{through T 60.}
[0040]
Next, the site monitoring apparatus 5, to compare the one second of data T _n and abnormality determination value (step 306), if it exceeds the abnormality determination value, the rotating machine operation stop command and abnormality to monitoring server 7 An alarm is issued (steps 307 to 308). This abnormality determination value is PD intensity 250 mV, as in the first embodiment. The monitoring server 7 transmits an operation stop command and an abnormality alarm to the administrator of the target rotating machine (steps 321 to 322, steps 323 to 324). Then, the data T _{1 to} T _n are transmitted to the monitoring server 7 (Step 309).
[0041]
The measurement interval determination value data T _n illustrated in FIG. Measurement interval determination value data T _n is obtained by determining based on about 150 units actual measurement result of accumulated to date.
[0042]
In monitoring server 7, after receiving the data stored (step 325 to 326), it reads data _T 1 through T _n (step 327), analyzes the data _{T n} previous data _{T 1 ~T n-1} ( Step 328), grasp the precursory phenomenon of the occurrence of the abnormality, and use it for the data for specifying the content of the abnormality and the location of the abnormality. The content of the abnormality and the location of the abnormality occurrence are specified using a database based on past accumulated data.
[0043]
On the other hand, it compares the data _{T n} and abnormality determination value (step 306), the following cases abnormality determination value, and transmits the data _{T n} to the monitoring server 7 (step 310). In monitoring server 7, and stores the received data _{T n} (step 329-330).
[0044]
Next, it is determined whether the data _{T n} is in the extent of the PD level for abnormality determination value, in accordance with the PD level determines the PD level measurement interval _{T n} (step 311), the data _{T n} The measurement interval is recorded according to the PD level (step 312).
[0045]
That is, the spacing frequency of PD measurement, abnormal transmits data if abnormal determination is finished stage of T _n values end is first measured. If there is no abnormality moves to the next measurement the measurement data is overwritten on the previous data T ₁ through T _n. If the error T is _equal to or less than the abnormality determination value and is close to the abnormality determination value, the data Tn is transmitted, for example, once every 60 minutes. The transmission interval is increased within a range of once every seven days.
[0046]
As described above, in the third embodiment, the long memory 54 is used to repeat the measurement → data storage → judgment → measurement → data overwrite storage → judgment → measurement, and a ring memory for constantly overwriting the latest data in the memory 54. It has a function as.
[0047]
In the third embodiment, the measurement time is set to 60 seconds. However, by increasing the memory capacity and lengthening the measurement time in response to the insulation deterioration event to be determined, it is possible to grasp abnormal precursory phenomena of various deterioration events. I can do it.
[0048]
Normal measurement values are data at the time of measurement, and data before the measurement value in time cannot be known. In the third embodiment, data before the measured value to be managed can be grasped.
[0049]
Further, when an abnormality occurs or when the occurrence of an abnormality is approaching, a precursory phenomenon of abnormal deterioration can be known. As a result, the content of the abnormality and the location of the abnormality can be specified, and high-precision diagnosis can be performed. The ability to perform high-precision diagnosis makes it possible to predict the repair content before disassembly, thereby reducing maintenance costs.
[0050]
【The invention's effect】
As described above, the remote state monitoring system according to the present invention can monitor the deteriorated rotating machine at a high frequency, so that the reliability of the rotating machine can be ensured. In addition, storing the monitoring signal in the ring memory enables the data immediately before the occurrence of the abnormality to be collected, thereby improving the accuracy of the deterioration diagnosis and easily identifying the cause of the deterioration.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a remote status monitoring system according to Embodiment 1 of the present invention.
FIG. 2 is a diagram showing a configuration of a site monitoring device of the remote status monitoring system according to the first embodiment of the present invention.
FIG. 3 is a flowchart showing an operation of the remote status monitoring system according to the first embodiment of the present invention.
FIG. 4 is a flowchart showing an operation of a site monitoring device of the remote status monitoring system according to the second embodiment of the present invention.
FIG. 5 is a diagram showing a determination level of a site monitoring device of a remote status monitoring system according to Embodiment 2 of the present invention.
FIG. 6 is a flowchart showing an operation of the remote status monitoring system according to Embodiment 3 of the present invention.
FIG. 7 is a diagram showing measurement interval determination values of a site monitoring device of a remote status monitoring system according to Embodiment 3 of the present invention.
[Explanation of symbols]
Reference Signs List 1 remote condition monitoring system, 2 rotating machine, 3 monitoring signal detection sensor, 4 CT power supply, 5 site monitoring device, 6 public line, 7 monitoring server, 51 CPU, 52 detection circuit, 53 A / D conversion circuit, 54 memory, 55 communication modules, 71 communication modules, 72 notebook computers.

Claims (2)

A detection sensor that is installed on the rotating machine and detects a monitoring signal of the rotating machine;
A site monitoring device that measures a monitoring signal from the detection sensor, and monitors an operation state of the rotating machine based on the measured monitoring signal and a determination value.
A monitoring server that receives the measured monitoring signal from the site monitoring device through a public line,
The site monitoring device has a plurality of pre-registered determination values that are classified according to control means and the degree of abnormality, and the control means compares the measured monitoring signal with the plurality of determination values, When the measured monitoring signal exceeds the maximum value among the plurality of determination values, an abnormal alarm is transmitted to the monitoring server, and the measured value to the monitoring server is measured based on a comparison result based on the plurality of determination values. A remote state monitoring system for controlling a transmission interval of a monitored signal. A detection sensor that is installed on the rotating machine and detects a monitoring signal of the rotating machine;
A site monitoring device that measures a monitoring signal from the detection sensor for a predetermined time, and monitors an operation state of the rotating machine based on a plurality of monitoring signals and a determination value in a time series of the measured predetermined time,
A monitoring server that receives a plurality of time-series monitoring signals of the measured predetermined time from the site monitoring device through a public line,
The on-site monitoring device includes a control unit and a memory. The control unit stores a plurality of time-series monitoring signals measured for the predetermined time in the memory, and stores one of the plurality of measured monitoring signals. And comparing the determination values with each other, and when one of the measured plurality of monitoring signals exceeds the determination value, transmits an abnormality alarm to the monitoring server and stores the monitoring signal before abnormality occurrence stored in the memory. To the monitoring server,
The remote status monitoring system, wherein the monitoring server analyzes a precursory phenomenon of the occurrence of the abnormality based on the monitoring signal before the occurrence of the abnormality.

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