Data collection device

Abstract

To provide a data collection device capable of recording a plurality of kinds of waveform data by one trigger.SOLUTION: The recording task 5 monitors the currents taken in from the channels CH1 to CH9 and records the current values in the memory 4 when the current values satisfy a predetermined trigger condition, and the recording task 5 includes a first recording element that records the current values by a predetermined number of times at equal intervals over a first recording time, and a second recording element that records the current values by a predetermined number of times at equal intervals over a second recording time different from the first recording time. Simultaneous recording is possible, and a first recording time and a second recording time can be set.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a data collection device that constantly collects data such as current values ​​and records the data when a trigger condition is met. [Background technology]

[0002] Conventionally, for example, to check the health of various devices in a substation, on-site inspections and patrols have been conducted, but because this requires a great deal of time and effort, data collection devices have been introduced that collect current and voltage values ​​from each device. These data collection devices record waveform data when waveform data such as current and voltage meets a predetermined trigger condition, and some are known to selectively record only waveform data within a specific range in order to improve the efficiency of data analysis (see, for example, Patent Document 1).

[0003] This device includes a waveform data recording unit that records waveform data, and a storage condition recording unit that pre-stores an initial value of a trigger condition for starting recording of waveform data, a recording end condition, and modification information for modifying the value of the trigger condition.The device starts and ends recording of waveform data in the waveform data recording unit by sequentially modifying the value of the trigger condition from its initial value based on the modification information in accordance with the trigger condition and end condition. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-251855 Summary of the Invention [Problem to be solved by the invention]

[0005] For example, when a device is started and waveform data satisfies a predetermined trigger condition, there are cases where it is desired to know detailed waveform data at the instant immediately after the start-up, as well as waveform data over a long period thereafter. However, the device described in Patent Document 1 can only record a series of waveform data of one type (with a uniform recording cycle and recording time) from when the trigger condition is satisfied until the termination condition is satisfied.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a data acquisition device that can record multiple types of waveform data with one trigger. [Means for solving the problem]

[0007] In order to solve the above problem, the invention of claim 1 is a data collection device comprising: a channel that takes in a recording object including a current from an external device; and a recording means that monitors the recording object taken in from the channel and records the value of the recording object in a data storage unit when the value of the recording object satisfies a predetermined trigger condition, wherein the recording means is capable of simultaneously recording with a first recording element that records a predetermined number of values ​​of the recording object at equal intervals over a first recording time, and a second recording element that records the predetermined number of values ​​of the recording object at equal intervals over a second recording time different from the first recording time, and wherein the first recording time and the second recording time are settable.

[0008] The invention of claim 2 is characterized in that, in the data collection device of claim 1, when the recording object is AC, the recording means is capable of recording the effective value of the recording object in the data holding unit, and is capable of selecting recording in two recording elements simultaneously from the first recording element, the second recording element, and a third recording element that records the effective value.

[0009] The invention of claim 3 is characterized in that, in the data collection device of claim 1 or 2, it has a plurality of the channels and is capable of setting channels that are linked to each other, and when a value to be recorded taken from one channel satisfies a predetermined trigger condition, the recording means records the value to be recorded in the data holding unit, and also records a value to be recorded taken from a channel that is linked to the channel in the data holding unit.

[0010] The invention of claim 4 is characterized in that, in the data collection device of claim 2, when a trigger request is input from outside, the recording means records the value to be recorded in the data holding unit using two recording elements selected from the first recording element, the second recording element, and the third recording element, regardless of whether the trigger condition is met.

[0011] The invention of claim 5 is characterized in that, in the data collection device described in claim 1, the case where the specified trigger condition is met is when the steady-state value of the recording object exceeds an increase threshold or when the steady-state value of the recording object falls below a decrease threshold, the steady-state value is an average value of the specified value of the recording object going back in time from the present, and the steady-state value is constantly calculated and updated. [Effects of the Invention]

[0012] According to the invention described in claim 1, with one trigger, the same recording target value is recorded a predetermined number of times at equal intervals over a first recording time, and also recorded the same predetermined number of times at equal intervals over a second recording time different from the first recording time. In other words, the same recording target value is recorded for the first recording time at the first recording period (= first recording time ÷ predetermined number) and simultaneously recorded for the second recording time at the second recording period (= second recording time ÷ predetermined number), making it possible to record multiple types of waveform data with a single trigger. This enables appropriate analysis and consideration. Moreover, because the first recording period and the second recording period (the first recording period and the second recording period) can be set, it is possible to record multiple waveform data with desired recording periods and recording times, enabling appropriate analysis and consideration.

[0013] According to the invention described in claim 2, when the recording target is AC, the effective value of the recording target can be recorded in addition to the waveform data described in claim 1, so it is possible to record a wider variety of waveform data, which makes it possible to perform appropriate analysis and consideration.

[0014] According to the invention described in claim 3, when a trigger is applied to a recording target of one channel, the value of this recording target is recorded, and the values ​​of the recording targets of channels linked to this channel are also recorded. In other words, when a trigger is applied to one recording target, the values ​​of other recording targets are also recorded, making it possible to perform appropriate analysis and consideration.

[0015] According to the invention described in claim 4, when a trigger request is input from the outside, recording as described in claim 2 is performed at that time (immediately), making it possible to record multiple types of waveform data at any time. As a result, it becomes possible to obtain waveform data during normal times when no trigger is activated and perform appropriate analysis and consideration.

[0016] According to the invention described in claim 5, the steady-state value to be recorded is constantly calculated and updated, and whether the value to be recorded satisfies a predetermined trigger condition is determined based on this steady-state value, so that it is always possible to make an appropriate determination based on the latest steady-state value. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a conceptual diagram showing an arrangement state of a data collection device according to an embodiment of the present invention; [Figure 2] 2A is a front view showing the main body of the data collection device of FIG. 1, FIG. 2B is a plan view showing the main body of the data collection device of FIG. 1, and FIG. 2C is a rear view showing the main body of the data collection device of FIG. [Figure 3] 2A shows a DC cable of the data collection device of FIG. 1, and FIG. 2B shows an AC cable. [Figure 4] 2A is an explanatory diagram of steady-state values ​​in the data collection device of FIG. 1, and FIG. 2B is an explanatory diagram of a recording period. [Figure 5] 1. FIG. 4 is an explanatory diagram showing the operation of the data collecting device of FIG. 1 when a trigger condition is satisfied. [Figure 6] 1. FIG. 4 is an explanatory diagram showing the operation when a trigger request is input in the data collecting device of FIG. [Figure 7] 1. FIG. 4 is an explanatory diagram showing the operation of the data collecting device of FIG. 1 when a stop request is input. [Figure 8] FIG. 2 is an explanatory diagram showing the operation of recording in conjunction with one another in the data collection device of FIG. 1; DETAILED DESCRIPTION OF THE INVENTION

[0018] The present invention will be described below based on the illustrated embodiments.

[0019] FIG. 1 is a conceptual diagram showing the installation state of a data collection device 1 according to an embodiment of the present invention, and FIG. 2 is a front view (a), a plan view (b), and a rear view (c) showing the main body 10 of this data collection device 1. This data collection device 1 is an operating characteristics measurement device that constantly collects data such as current values ​​and voltage values ​​and records the data when a trigger condition is met. In this embodiment, we will explain the case where the currents (to be recorded) of various devices in a substation are collected and recorded, but the present invention can also be applied to other facilities such as factories, and objects other than current may be collected and recorded.

[0020] Here, the data collection device 1 is communicably connected to a host device via a communication network, and the host device is further communicably connected to an analysis system of a power company via the communication network. This allows data collected and recorded by the data collection device 1 to be analyzed by the analysis system via the host device. In addition, a maintenance PC (personal computer) can be used to maintain the data collection device 1 and set trigger conditions, recording time, recording elements, linked channels, etc., which will be described later.

[0021] The front of the main body 10 of the data acquisition device 1 is provided with multiple channels CH1 to CH9 (nine in this embodiment) for importing recording data, including current, from external devices (such as DC power supplies and station panels). Specifically, DC current can be imported by attaching terminals 21 of a DC cable 2 to channels CH1 to CH9, as shown in FIG. 3(a), and clamping the cable of the external device with a clamp 22 of the DC cable 2. Similarly, AC current can be imported by attaching terminals 31 of an AC cable 3 to channels CH1 to CH9, as shown in FIG. 3(b), and clamping the cable of the external device with a clamp 32 of the AC cable 3. Here, setting pins for importing DC or AC current are provided on the cables 2 and 3, and a program for determining whether the current is DC or AC is provided in the main body 10. The DC cable 2 and AC cable 3 can be connected to any of channels CH1 to CH9.

[0022] Furthermore, on the front of the main body 10 are provided a power switch 11 for opening and closing the control power supply, a power supply fuse 12, a power supply connection terminal block 13 for inputting the control power supply, a DI / DO connector 14 for external input and external output, and a LAN connection connector 15 for communicating with a higher-level device. Also, on the back of the main body 10 are provided a LAN connection connector 16 for communicating with a maintenance PC, and LEDs (indicator lights) 17 for the internal power supply and channels CH1 to CH9.

[0023] The main body 10 of such a data collection device 1 is equipped with a memory (data storage unit) 4 that records and stores current values ​​(values ​​to be recorded), and a recording task (recording means) 5 that records (writes) the current values ​​in the memory 4.

[0024] Recording task 5 is a task program that monitors the current captured from each channel CH1 to CH9 and records the current value in memory 4 when the current value meets a predetermined trigger condition, and is capable of recording the current value in the following three recording elements (recording formats): First, it has a first recording element that records a predetermined number of current values ​​at equal intervals over a first recording time, and a second recording element that records the same predetermined number of current values ​​at equal intervals over a second recording time that is different from the first recording time.

[0025] In this embodiment, the predetermined number is 5000, and both the first and second recording elements record 5000 data and current values. The first and second recording times can be set to any time between 1 second and 70 minutes in 1-second increments. For example, as shown in FIG. 4B, if the first recording time is set to 1 second, the first recording period is 0.2 msec (= 1 sec ÷ 5000), and current values ​​are recorded at 0.2 msec intervals for 1 second after the trigger condition is met. Similarly, if the second recording time is set to 8 seconds, the second recording period is 1.6 msec (= 8 sec ÷ 5000), and current values ​​are recorded at 1.6 msec intervals for 8 seconds after the trigger condition is met.

[0026] Furthermore, when the current is AC, the device has a third recording element that records the effective value of the AC current. That is, when the current is AC, the effective value is constantly calculated and updated at 1.4 msec intervals, and after the trigger condition is met, a predetermined number of effective values ​​(5,000) are recorded.

[0027] It is possible to select recording using two of the first, second, and third recording elements simultaneously. For example, by selecting the first and second recording elements, it is possible to record current values ​​at 0.2 msec intervals for one second (recording instantaneous values) and current values ​​at 1.6 msec intervals for eight seconds. Similarly, it is possible to select the first and third recording elements, it is possible to record current values ​​at 0.2 msec intervals for one second and record the effective value of AC current.

[0028] In this embodiment, the current value immediately before the trigger condition is satisfied is recorded as pre-trigger data for a predetermined number of pre-trigger data points for both selected recording elements. That is, in this embodiment, 25 current values ​​are recorded going back to when the trigger condition was satisfied.

[0029] Here, the trigger condition is a condition for starting recording of a current value, and in this embodiment, the trigger condition is a threshold for the increase or decrease from a steady state value (normal value). That is, the trigger condition is met when the increase threshold from the steady state value is exceeded or when the decrease threshold from the steady state value is fallen below. For example, if the trigger condition (threshold for increase) is set to "+5A", the trigger condition is met when the current exceeds the steady state value by 5 A. Similarly, if the trigger condition (threshold for decrease) is set to "-5A", the trigger condition is met when the current falls below the steady state value by 5 A. Note that if the current is AC, the trigger condition is set using the effective value. Such trigger conditions are set for each of channels CH1 to CH9.

[0030] The steady-state value is calculated from the average value of a predetermined number of current values ​​going back in time. That is, in this embodiment, as shown in FIG. 4(a), the steady-state value is calculated by averaging 20 current values ​​going back from 25 to 44 times in the past, going back from the present. Therefore, for example, when recording for 1 second at 0.2 msec intervals (recording instantaneous values), the average value is obtained over 4 msec (= 0.2 msec x 20), and when recording the effective value of AC current, the average value is obtained over 28 msec (= 1.4 msec x 20). The steady-state value is constantly calculated and updated, and this constant value is used. The steady-state value is compared with the latest value to determine whether the trigger condition is met. When a trigger is activated, the steady-state value is calculated, including the current value at the time of the trigger.

[0031] Here, the memory 4 records and stores the recording date and time (trigger date and time) and the current values ​​by the two recording elements in association with each other for each of the channels CH1 to CH9. At this time, the data may be temporarily stored in a work area, and then recorded and stored in the memory 4 after the first recording time, the second recording time, etc. have elapsed.

[0032] Recording task 5 further has the following operations and functions:

[0033] As a first operation / function, if the trigger conditions as described above are met and even one of the two recording elements meets the trigger condition again during recording, this trigger (recording start) will not be accepted, as shown in Figure 5. In other words, recording will start only if the trigger condition is met when neither of the two recording elements is currently recording.

[0034] As a second operation / function, as shown in Fig. 6, when a trigger request is input from the outside, the current value is recorded in memory 4 using the two selected recording elements, regardless of whether the trigger condition is met. That is, when a trigger request is input specifying channels CH1 to CH9 from a maintenance PC or the like, the current value captured in those channels CH1 to CH9 is immediately recorded in memory 4 using the two recording elements selected for those channels CH1 to CH9. In this case, as with the first operation / function, recording starts only if a trigger request is input when neither of the two recording elements is currently recording.

[0035] As a third operation / function, as shown in Figure 7, when a stop request is input from the outside, recording of current values ​​is stopped. That is, when a stop request is input from a maintenance PC or the like specifying channels CH1 to CH9, if the current values ​​of those channels CH1 to CH9 are currently being recorded, recording of the current values ​​for those channels CH1 to CH9 is immediately stopped at that point. Therefore, the current values ​​up until the stop request is input are recorded in memory 4. This makes it possible to immediately record new current values ​​at the next trigger without waiting for the first or second recording time.

[0036] As a fourth operation / function, it is possible to set channels CH1 to CH9 to be linked with one another, and when a current value captured from any one of channels CH1 to CH9 satisfies a predetermined trigger condition, this current value is recorded in memory 4, and current values ​​captured from channels CH1 to CH9 linked to this channel CH1 to CH9 are also recorded in memory 4. That is, it is first possible to arbitrarily set which channels CH1 to CH9 are linked with which channels CH1 to CH9, and for example, as shown in Figure 8, it is possible to set channel CH5 and channel CH7 to be linked. Furthermore, it is possible to set any number of linked channels CH1 to CH9, not just two (one to one), and it is possible to set up to nine channels to be linked.

[0037] 8, for example, when a current value acquired from channel CH5 satisfies a predetermined trigger condition, this current value is recorded in memory 4, and at the same time, a current value acquired from channel CH7 linked to channel CH5 is also recorded in memory 4, regardless of whether the trigger condition of channel CH7 is satisfied. Similarly, when a current value from channel CH7 satisfies a predetermined trigger condition, the current values ​​from channels CH7 and CH5 are recorded in memory 4. Here, the current values ​​are recorded in memory 4 using two recording elements selected for each of channels CH5 and CH7. Furthermore, when channels CH5, CH7, and CH8 are set to be linked, the current value from channel CH8 is also recorded in memory 4.

[0038] With the data collection device 1 configured as described above, a single trigger causes the current from one of channels CH1 to CH9 to be recorded at equal intervals for a predetermined number of times over a first recording time, and also at equal intervals for the same predetermined number of times over a second recording time that is different from the first recording time. In other words, the same current value is recorded for the first recording time over a first recording period (= first recording time ÷ predetermined number) and simultaneously recorded for the second recording period (= second recording time ÷ predetermined number), making it possible to record multiple types of waveform data with a single trigger. This enables appropriate analysis and consideration in an analysis system, etc. Furthermore, because the first recording period and the second recording period (the first recording period and the second recording period) can be set, it is possible to record multiple waveform data with desired recording periods and recording times, enabling appropriate analysis and consideration.

[0039] For example, immediately after the device is started, detailed waveform data can be acquired and recorded by shortening the recording cycle, and thereafter waveform data can be acquired and recorded over a longer period by lengthening the recording cycle, thereby enabling proper analysis and consideration. Moreover, in this embodiment, the current value before the trigger condition is met is also recorded as pre-trigger data, so that more proper analysis and consideration can be made by comparing the data and current values ​​before and after the trigger, for example.

[0040] Furthermore, in addition to these two waveform data, when the recording target is AC, the effective value can also be recorded, making it possible to record a wider variety of waveform data, which in turn makes it possible to perform appropriate analysis and consideration in analysis systems, etc.

[0041] Furthermore, when a trigger is applied to the current of one of the channels CH1 to CH9, this current value is recorded, and the current values ​​of the channels CH1 to CH9 linked to this channel are also recorded. In other words, when a trigger is applied to one current, the other current values ​​are also recorded, making it possible to perform appropriate analysis and consideration in an analysis system, etc. For example, in the case of three-phase AC, by connecting channels CH1 to CH9 to each phase and linking them, when a trigger is applied to any one phase, the current values ​​of all three phases are recorded. This makes it possible to view the current values ​​of each of the three phases and perform appropriate analysis and consideration.

[0042] Furthermore, when an external trigger request is input, recording is performed (immediately) using two recording elements, making it possible to record multiple types of waveform data at any time. As a result, it is possible to acquire waveform data during normal times when no trigger is activated and perform appropriate analysis and consideration. In other words, it is possible to acquire and record the current value of any channel CH1 to CH9 at any time and perform the desired analysis and consideration.

[0043] On the other hand, the steady-state value of the current is constantly calculated and updated, and whether the current value satisfies the specified trigger condition is determined based on this steady-state value, so that it is always possible to make an appropriate determination based on the latest steady-state value.

[0044] Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and the present invention also includes design changes that do not deviate from the scope of the present invention. For example, in the above embodiment, the trigger conditions, two recording elements, and linked channels are set by the maintenance PC, but these may also be set by the data collection device 1 itself. [Explanation of symbols]

[0045] 1. Data collection equipment 10 Main Unit CH Channel 2 DC cable 3 AC cable 4 Memory (data storage unit) 5 Recording tasks (recording methods)

Claims

1. A channel for capturing recording targets including current from an external device; a recording means for monitoring the recording object captured from the channel, and for recording the value of the recording object in a data storage unit when the value of the recording object satisfies a predetermined trigger condition; the recording means is capable of simultaneously recording with a first recording element that records a predetermined number of values ​​to be recorded at equal intervals over a first recording time, and a second recording element that records the predetermined number of values ​​to be recorded at equal intervals over a second recording time different from the first recording time, The first recording time and the second recording time can be set. A data collection device characterized by:

2. When the object to be recorded is an AC current, the recording means can record an effective value of the object to be recorded in the data storage unit, recording by two recording elements simultaneously can be selected from the first recording element, the second recording element, and the third recording element for recording the effective value; 2. The data collection device according to claim 1.

3. It is possible to set multiple channels linked to each other, When a value to be recorded that is acquired from one channel satisfies a predetermined trigger condition, the recording means records the value to be recorded in the data storage unit, and also records values ​​to be recorded that are acquired from channels linked to the channel in the data storage unit.

3. The data collection device according to claim 1, wherein the data collection device is a data collection device for collecting data from a plurality of data sources.

4. when a trigger request is input from outside, the recording means records the value to be recorded in the data holding unit using two recording elements selected from the first recording element, the second recording element, and the third recording element, regardless of whether the trigger condition is satisfied.

3. The data collection device according to claim 2.

5. The case where the predetermined trigger condition is satisfied is when the value exceeds a threshold value for an increase in the steady value to be recorded, or when the value falls below a threshold value for a decrease in the steady value to be recorded, and the steady value is an average value of the predetermined values ​​to be recorded going back from the present to the past, and the steady value is constantly calculated and updated.

2. The data collection device according to claim 1.

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