JPS60151720A - Plant data recorder - Google Patents

Abstract

PURPOSE:To analyze in detail the changing state of the plant state quantity by accelerating the reading or outputting cycle in case the changing range of the plant state quantity is large. CONSTITUTION:A state quantity scan means 1 of a plant data recorder scans the plant state quantity P in the cycle of a delay timer 2 and holds it at a state quantity memory part 3. While the means 1 scans and holds the state quantity for a fixed period of time in case a plant fault signal is delivered and then delivers it to a recorder via an output processing means 4 with tabulation. In this case, a changing factor arithmetic means 6 extracts both the scan value of this time and that of the preceding time and calculates the changing factor of each state quantity in the scan cycle given from the timer 2. This changing factor is compared 7 with a standard changing factor 8 to decide the maximum excess factor. Then the optimum cycle is decided by an optimum cycle deciding means 9. Thus the quantity P is collected in the optimum cycle according to the plant state of that time point.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a plant data recording device suitable for storing transient phenomena of major state variables in one power generation plant.

[Technical t- of the invention! i' Site and its problems] In general, in power plants, etc., the occurrence of unexpected situations such as natural phenomena such as lightning strikes or malfunctioning of equipment within the plant may cause the entire plant to malfunction due to the operation of the safety circuit, leading to an accidental shutdown. .

In such cases, in order to analyze the changes in the state quantities leading up to the accident and the stable state after the accident, the main state quantities in the plant are constantly read and saved at regular intervals, and when an abnormality occurs, the preceding and following Plants are often equipped with a plant data recording device that can tabulate and output data. However, in conventional systems, there are almost no cases in which all these functions are realized as a unique system, and in most cases, they are implemented as part of a plant monitoring system (realized as a high-performance one) inside the divider that monitors the plant in general. The majority of cases are 7 cases.Therefore, a total of 19
Due to constraints such as load conditions on the machine, data is read and saved at certain regular cycles, the output is also saved, and the data is simply output in one series. 1s,
Even when there are large fluctuations in state quantities before and after a plant abnormality occurs,
Data is output at the same cycle even when there are few fluctuations during plant steady state.

However, from the viewpoint of data analysis, when the state quantity fluctuates greatly, data with a finer period is necessary, and conversely, when the fluctuation is small, there is no problem even with a slightly longer period. . In conventional systems, the first period is not variable in response to changes in the state quantity, which may cause inconvenience during analysis.

[Purpose of the invention]

The purpose of Kinei BA is to provide a plant data recording device that can speed up the reading cycle or output cycle when the range of change in the plant state quantity is large, and enables detailed analysis of the effects of changes in the state quantity. do.

[(1) Requirement of the Invention] For this reason, Kinori] uses a change rate calculation means for calculating the change rate of the ground state quantity, a comparison wave n means for comparing the calculated change rate with a reference, and a calculation result. The system is equipped with an optimal cycle determining means that determines the optimal scanning cycle (or output cycle) that matches the current rate of change, and reads ( -straddle output)
It is characterized by being able to perform analysis efficiently with minimal data output.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a plant data recording device according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes state quantity scanning means, which scans the ground state quantity P inputted from the outside at the period of the delay timer 2 and stores it in the state quantity storage section 3. Further, when a grant abnormality signal is detected, the state quantity is scanned for a certain period of time, and after being stored, the output processing means 4 is activated. The output processing means 4 is
The state quantity storage unit 3 sequentially takes out the data, tabulates it, and outputs it to the recording device 5.

In the figure, the dashed-dotted line portion is a feature of this embodiment, and is 6
is a change rate calculation means, which is activated by the state quantity scanning means 1 and retrieves the current scan value and previous scan value of each state quantity from the state quantity storage section 3.

Further, the delay timer 2 reads out the current scanning period, and calculates the rate of change of each state quantity using the following equation (1).

The rate of change calculation means 6 activates the comparison calculation means 7 after the processing is completed. The comparison calculation means 7 is similar to the rate of change calculation means 6 (1) above.
After receiving the result calculated using the formula, the reference change rate data for scanning period change determination is retrieved from the reference change rate storage section 8, and the two are compared for each state quantity. As a result of the comparison, if there is a rate of change that exceeds the standard rate of change, calculate the rate of change from the standard rate of change using formula (2) below, and determine the maximum value. The optimum cycle determining means 9 is activated.

However, n: natural number (indicating the total number of state quantities collected by this device).The optimal cycle determining means 9, which indicates 1 shift, determines the optimal cycle based on the maximum excess rate received from the comparison calculation means 7.

FIG. 2 shows an example of the optimum cycle determining means 9. The maximum excess rate a determined by the comparison calculation means 7 is input to the function generation means 91. FIG. 3 shows an example of functions inside the function generating means 91. The function generating means 91 determines the scanning period using the function shown in FIG. 3, for example. The determined scanning period is notified to the scanning period determining means 92.

The scanning period determining means 92 compares the scanning period notified by the function generating means 91 with the current scanning period C stored in the scanning period storage section 93.

If the former track is shorter, select the signal track and proceed to No. 18C.
If it is longer, the value obtained by adding a certain value (for example, 1 second) to the signal C is set as the scanning period d. This is to make the cycle change as smooth as possible. The scanning period determining means 92 stores the decided scanning period d in the scanning period storage section 93 and further sets it in the delay timer 2.

As a result, the ground state quantity P can be collected at the time f
- It is carried out at an optimum period according to the plant state, and the optimum data for plant analysis can be obtained.

FIG. 4 shows another embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same or corresponding parts. In this figure, the input of the song tjJi is performed at a fixed period set in the delay timer 2.

Similarly to FIG. 1, when the state quantity scanning means 1 captures a plant abnormality signal, it then scans the state scene at high speed for a certain period of time, stores it in the state quantity storage section 3, and then activates the output processing means 4. The output processing means 4 has a shape of πF+4. Memory? 51S
The output data is taken out from 3, and the change rate information is notified to the means 6. After that, the optimum cycle is determined in the same manner as described above. The optimal cycle determining means 9 notifies the output processing means 4 of the determined optimal cycle. In the output section "11 stage 4, according to the notified optimal cycle jυj, the state j′ flood note 1
．． The data is taken out from the unit 3 and outputted to the storage device 5.

In this way, the human-powered plant state quantities P can be read sequentially and escaped.
1. However, while the process of storing data in the state storage unit 3 is performed at the shortest cycle, the output cycle of outputting to the recording device 5 may be determined according to the rate of change of the current plant state quantity. Similar effects can be obtained.

Above, an embodiment in which the present invention is applied to the state quantity scanning means 1 and an embodiment in which the present invention is applied to the output processing means 4 have been described. (for example, when the functions of the present invention are incorporated into a computer system manufactured for the purpose of ), and each case can be applied depending on the characteristics of the device λ. In other words, in the case of a dedicated device, the state quantity is scanned at a high speed and at a constant cycle as explained in FIG. 4, and the contents of the present invention can be applied at the time of output. It is also used in conjunction with other functions, and if high-speed scanning is not possible due to the capabilities of the processing device, the cycle of the state quantity scanning means 1 can be adjusted as explained in FIG. It is possible to reduce the load,
Wear.

In the above description, the present invention has been explained in two cases: one applied to the state quantity scanning means, and the other applied to the output processing means, but it is also possible to apply both together.

It's a book! If you also want to use a method that does not apply 61ㅅJ, it is also possible to install a TI change switch in Ili D of the optimum cycle determining means 9 and operate it depending on whether it is applied or not. .

In the 11th example, the calculation method in the rate of change calculation means is to calculate the absolute value of the difference between the previous and current scan values by scanning fl ``10,000 l''; As explained in the form, in the case of the state l″ljl,i,′+i, where the fluctuation is large,
In cases where it is not desirable to calculate using this method, the rate of change may be calculated using the least squares method using several past calculations.

[Original January, Kashi 11. 〕 According to the invention, reliable plant data can be obtained at intervals according to the blunt condition at that time, and the analysis of data waste becomes effective. .

[Brief explanation of drawings]

FIG. 1 is a diagram of a block 47 of a plant data recording device according to an embodiment of the present invention, and FIG. 2 is a detailed diagram of the optimal cycle determining means in FIG. 1.
FIG. 2 is an explanatory diagram of functions used in the function generating means, and FIG. 4 is a block diagram of a plant data recording device according to another embodiment of the present invention. 1... State quantity scanning means, 2... Delay timer, 3...
- State amount storage unit, 4... Output processing means, 5... Recordability j? i1.6... Change rate calculating means, 7... Ratio axis calculating means, 8... Reference rate of change storage section, 9... Optimum cycle determining means, 91... Function generating means, 92... Scanning Period determining means, 93...Scanning period storage section. (7317) Agent Ben), IP specialist Nori Chika, ・Ei
Yu (1 other person)

Claims (1)

[Claims] The state quantities of each part of the plant are read periodically to determine the state h4.
In a plant data recording device that stores the stored state quantities in a storage unit and outputs the stored state quantities in time series as necessary, a rate-of-change calculation means for calculating the rate of change of the state quantities; What is claimed is: 1. A plant data recording device, comprising: optimum cycle determining means for determining an optimum cycle based on a rate of change; and outputting necessary plant data at the optimum cycle.