US-12619622-B2 - Data collection device, plant monitoring system and data collection method

US12619622B2US 12619622 B2US12619622 B2US 12619622B2US-12619622-B2

Abstract

A plant monitoring system comprises: a data collection device configured to collect multiple measured values measured during a plant equipment inspection; and a trend graph display part configured to generate a trend graph based on the multiple measured values. The data collection device comprises: a measured value collection part configured to collect multiple measured values; an event number assignment part configured to assign a same event number or a different event number to the multiple measured values based on a time difference between times at which the multiple measured values were acquired; and a measured value storage part configured to store the multiple measured values. The trend graph display part is configured to render the multiple measured values stored in the measured value storage part in a graph having measured value as a first axis and event number as a second axis.

Inventors

Ryo Shimizu
Naotake MIYASAKA
Takato SONODA

Assignees

TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION

Dates

Publication Date: 20260505
Application Date: 20190625

Claims (14)

1 . A plant monitoring method comprising: collecting multiple measured values using a resistance tester with respect to an inspection item of a plant equipment as an inspection target installed in a plant during a plant equipment inspection performed during each of a plurality of shutdown periods of the plant, the plant equipment including an electric motor, and the multiple measured values including electrical property values directly measured using the resistance tester in an insulating degradation check of a motor winding included in the electric motor; comparing and judging a time difference indicating a difference between two measurement times of two consecutive measured values included in the multiple measured values with a predetermined specified time difference, wherein the predetermined specified time difference is variably set for each of a plurality of shutdown periods based on the plurality of shutdown periods, respectively; assigning an event number to the multiple measured values collected during each of the plurality of shutdown periods of the plant, wherein a same event number is assigned to the two consecutive measured values if the time difference is smaller than the predetermined specified time difference, whereas a different event number is assigned to the two consecutive measured values if the time difference is greater or equal than the specified time difference; storing the multiple measured values in a state associated with the assigned event number and the multiple measured values collected during each of the plurality of plant shutdown periods; generating a trend graph based on the stored multiple measured values, the trend graph having measured value as a first axis and event number as a second axis, the multiple measured values having same event number being displayed as a group in association with visible information of temperature dependence of the motor winding; and displaying the trend graph on a graphical user interface operated by a user to predict failure of the plant equipment, in response to a request from the user through the graphical user interface, by drawing a bar graph corresponding an in-event measured value range for each group of the multiple measured values having same event number, respectively.
2 . A non-transitory computer-readable storage medium including computer executable instructions, wherein the instructions, when executed by a plant monitoring system, cause the plant monitoring system to perform a method, the method comprising: collecting multiple measured values using a resistance tester with respect to an inspection item of a plant equipment as an inspection target installed in a plant during a plant equipment inspection performed during each of a plurality of shutdown periods of the plant, the plant equipment including an electric motor, and the multiple measured values including electrical property values directly measured using the resistance tester in an insulating degradation check of a motor winding included in the electric motor; comparing and judging a time difference indicating a difference between two measurement times of two consecutive measured values included in the multiple measured values with a predetermined specified time difference, wherein the predetermined specified time difference is variably set for each of a plurality of shutdown periods based on the plurality of shutdown periods, respectively; assigning an event number to the multiple measured values collected during each of the plurality of shutdown periods of the plant, wherein a same event number is assigned to the two consecutive measured values if the time difference is smaller than the predetermined specified time difference, whereas a different event number is assigned to the two consecutive measured values if the time difference is greater or equal than the specified time difference; storing the multiple measured values in a state associated with the assigned event number and the multiple measured values collected during each of the plurality of plant shutdown periods; and generating a trend graph based on the stored multiple measured values, the trend graph having measured value as a first axis and event number as a second axis, the multiple measured values having same event number being displayed as a group in association with visible information of temperature dependence of the motor winding, and displaying the trend graph on a graphical user interface operated by a user to predict failure of the plant equipment, in response to a request from the user through the graphical user interface, by drawing a bar graph corresponding an in-event measured value range for each group of the multiple measured values having same event number, respectively.
3 . The non-transitory computer-readable storage medium according to claim 2 , wherein the method further comprising: drawing the bar graph including a maximum value and a minimum value in the in-event measured value range for the multiple measured values to which the same event number has been assigned.
4 . The non-transitory computer-readable storage medium according to claim 3 , wherein the maximum value in the multiple measured values is a high temperature measured value in a state where a motor winding temperature of the motor winding is high immediately after the plant shutdown, wherein the minimum value in the multiple measured values is a low temperature measured value in a state where a motor winding temperature of the motor winding is almost air temperature after a predetermined time from the plant shutdown, and wherein the bar graph connecting the maximum value and the minimum value in the multiple measured values to which the same event number has been assigned is drawn to provide the visible information of temperature dependence of the motor winding.
5 . The non-transitory computer-readable storage medium according to claim 2 , wherein: the predetermined specified time difference is variably set based on a duration of each of the plurality of shutdown periods; and the bar graph corresponds to an in-event measured value range for each group of the multiple measured values having the same event number, respectively, the bar graph connecting a maximum value and a minimum value in the in-event measured value range, the method further comprising: drawing a measured maximum value trend graph connecting the maximum value in each group to the maximum value in a subsequent group and a measured minimum value trend graph connecting the minimum value in each group to the minimum value in a subsequent group.
6 . The non-transitory computer-readable storage medium according to claim 2 , wherein the second axis includes consecutive integers corresponding to the assigned event numbers, thereby collapsing time between the plurality of shutdown periods on the trend graph.
7 . The plant monitoring method according to claim 1 , wherein the electrical property values are current values measured by an insulation resistance tester.
8 . The plant monitoring method according to claim 1 , further comprising drawing a measured maximum value trend graph by connecting a maximum value in each group of the multiple measured values having the same event number to a maximum value in a subsequent group.
9 . The plant monitoring method according to claim 1 , further comprising switching a unit of the second axis of the trend graph between the event number and time responsive to an input of a switching instruction via the graphical user interface.
10 . The plant monitoring method according to claim 1 , wherein assigning the event number comprises: generating an event number setting flag based on the comparison of the time difference with the predetermined specified time difference; and updating the event number for a subsequent measured value based on the event number setting flag.
11 . The plant monitoring method according to claim 1 , wherein assigning a different event number comprises incrementing a previous event number by adding one to generate a new event number.
12 . The plant monitoring method according to claim 1 , comprising: drawing the bar graph including a maximum value and a minimum value in the in-event measured value range for the multiple measured values to which the same event number has been assigned.
13 . The plant monitoring method according to claim 12 , wherein the maximum value in the multiple measured values is a high temperature measured value in a state where a motor winding temperature of the motor winding is high immediately after the plant shutdown, wherein the minimum value in the multiple measured values is a low temperature measured value in a state where a motor winding temperature of the motor winding is almost air temperature after a predetermined time from the plant shutdown, and wherein the bar graph connecting the maximum value and the minimum value in the multiple measured values to which the same event number has been assigned is drawn to provide the visible information of temperature dependence of the motor winding.
14 . The plant monitoring method according to claim 12 , wherein the second axis includes consecutive integers corresponding to the assigned event numbers, thereby collapsing time between the plurality of shutdown periods on the trend graph.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present application is based on PCT filing PCT/JP2019/025163, filed Jun. 25, 2019, the entire contents of which are incorporated herein by reference. FIELD The present application relates to a data collection device, a plant monitoring system and a data collection method. BACKGROUND Conventionally, for example, JP2019-8435A proposes a method for displaying both alarm information and a trend graph of a device, which had been displayed separately, on a display screen of a trend graph. In this publication, measured values are displayed with the trend graph in a manner in which measurement time is represented in a horizontal axis. This publication also proposes a method for changing a display format of the trend graph during a period in which a failure occurs in the device and an alarm occurs. CITATION LIST Patent Literature [PTL 1] JP2019-8435A SUMMARY Technical Problem In the trend graph where the horizontal axis is set to the measurement time as in the conventional art, visibility may be lowered. An example case where the visibility is lowered includes a case to make the trend graph of a result of an inspection work that can be performed only at a plant shutdown. An example of the inspection work that can be performed only at the plant shutdown includes a motor winding insulation deterioration inspection that is performed in a steel plant or the like. The motor winding insulation deterioration inspection can only be carried out at the plant shutdown, and the plant shutdown is planned at a frequency of, for example, once a month based on a production plan of the plant. When measured values of such the motor winding insulation deterioration test are displayed in the trend graph where the horizontal axis is set to the measurement time, the visibility is lowered. This is because when the horizontal axis is set to the measurement time, a large amount of measured values is drawn during the plant shutdown period, whereas no measured value related to the plant operation is drawn. Therefore, the large amount of measured values is drawn in a specific time range, whereas measurement data is blank for a long period during the plant operation. As a result, the visibility of the trend graph is lowered. It is an object of the present application to provide a data collection device, a plant monitoring system and a data collection method for improving the visibility in which the measurement data is graphed. Solution to Problem A data collection device according to the present application comprises: a measured value collection part that is configured to collect multiple measured values;an event number assignment part that is configured to assign a same event number to the multiple measured values if a time difference between times at which the multiple measured values were acquired is smaller than a predetermined specified time difference, and is configured to assign a different event number to the multiple measured values if the time difference is greater or equal than the specified time difference; anda measured value storage part that is configured to store the multiple measured values in a state associated with the assigned event number and the multiple measured values. A plant monitoring system according to the present application comprises: a data collection device that is configured to collect multiple measured values measured during a plant equipment inspection; anda trend graph display part that is configured to generate a trend graph based on the multiple measured values collected by the data collection device,wherein the data collection device comprises:a measured value collection part that is configured to collect multiple measured values;an event number assignment part that is configured to assign a same event number to the multiple measured values if a time difference between times at which the multiple measured values were acquired is smaller than a predetermined specified time difference, and is configured to assign a different event number to the multiple measured values if the time difference is greater or equal than the specified time difference; anda measured value storage part that is configured to store the multiple measured values in a state associated with the assigned event number and the multiple measured values,wherein the trend graph display part is configured to render the multiple measured values stored in the measured value storage part in a graph having measured value as a first axis and event number as a second axis. A data collection method according to the present application comprises: a measurement collection step to collect multiple measured values;a comparison and judgment step to compare a time difference between times at which the multiple measured values were acquired with a predetermined specified time difference;an event number assignment step to assign a same event number to the multiple measured values if the time difference between times