JPS61246624A - Event analysis recorder - Google Patents

Abstract

PURPOSE:To restart an oscillograph by another start condition even when a start condition for the oscillograph continues to be established, by providing an automatic reset circuit which resets the start condition determined by an input signal, as well as an external start condition, when every condition signals is received. CONSTITUTION:An input signal A1 is converted into a bit signal A2 by an input converter 1 and stored in an analog memory 2 for a prescribed time, and then it is outputted as an analog signal A3 to an oscillograph 3. Meanwhile, the signal A1 is determined as to the presence of abnormality by an abnormality determination circuit 4, and when it has any abnormality, an abnormality determination signal D1 is outputted. When either of the signal D1 or an external start condition E1 is established, it is outputted to an OR circuit 6 through an automatic reset circuit 56, and a start signal S1 is outputted to the oscillograph OS3, so as for it to operate for a prescribed time. An output D3 of the circuit 5 disappears after a prescribed time even when either of the signal D1 or the condition E1 continues to be established. In the case when any abnormality occurs in another input signal thereafter, the signal S1 is given again to OS3 through the circuit 5 and 6, and thereby OS3 operates again for a prescribed time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an event analysis recorder for analyzing the causes of failures of electrical accidents, mainly in power plants and the like.

[Conventional technology]

FIG. 3 is a block diagram showing a conventional event analysis recorder. 3 is an oscillograph that memorizes A2 for a certain period of time and then outputs it as an analog signal A3. 3 is an oscillograph that writes the analog signal A3 on a recording paper. This oscillograph 3 only outputs the analog signal A3 for a certain period of time when the activation signal S1 is given. to start. 4#'i An abnormality determination circuit that analyzes the input signal A1 and detects the occurrence of an abnormality; 6 is a start signal S1 that generates the OR condition of the output D1 of the abnormality determination circuit 4 and the external start condition E1;
This is an OR circuit that outputs

In addition, in FIG. 3, input signal AI is used for simplicity.

Input signal A2. Although the case where the analog signal A3 and the abnormality determination output D1 are respectively 3 manual inputs or 3 outputs is shown, in reality, 8 to 16 inputs or outputs are commonly used #i.

Next, the operation will be explained. The input signal A1 is converted into a bit-formatted input signal A2 by the input converter 1, and is stored in the analog memory 2 for a certain period of time.

It is output to the oscilloscope 3 as an analog signal A3. On the other hand, the input signal A1 is judged by the abnormality determination circuit 4 as to whether or not there is an abnormality, and if there is an abnormality, an abnormality determination output D1 is output. If either the abnormality determination output D1 or the external activation condition E1 is satisfied, the OR circuit 6 outputs the activation signal S1 as a result of the OR operation, the activation condition for the oscillograph 3 is satisfied, and the oscillograph 3 is then activated for a predetermined period of time. only operates and outputs records before and after the error occurs. Here, multiple input signals A1 are input and $P9. We will analyze their mutual influence, but even if an abnormality occurs in one, it is quite possible that the other will remain in a healthy state.

[Problems that are raised but sought to be solved]

Since the conventional starting device is configured as described above, once the abnormal condition is established, the starting condition continues to be satisfied unless the cause of the accident is removed.

There was a problem in that the oscilloscope would not start even if an abnormality occurred in another input signal.

This invention was made to solve the above-mentioned problems. On the other hand, even if the abnormal condition continues to be established, the oscilloscope can be restarted by another input signal or other external start condition. The purpose is to obtain an event analysis recorder.

[Means for solving problems]

The event analysis recorder according to the present invention is a recorder that retroactively records past data for a certain period of time when an event such as an accident occurs. It is equipped with an automatic reset circuit that automatically resets the starting conditions for each condition signal, so that the oscilloscope can be restarted in response to a newly occurring abnormality.

[Effect]

The event analysis recorder according to the present invention has an automatic reset circuit.1 When each starting condition is satisfied, a starting command is issued to the oscilloscope once, and the first starting condition continues to be satisfied, but other starting conditions are When it is established, it has been reset and it is possible to issue a start command to the oscilloscope again.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, sl is an input converter that converts analog signal A1 to bit signal A2, 2#i is an analog memory that stores bit signal A2 for a certain period of time and then outputs it as analog signal A3, and 3 is analog signal M3 that is stored on storage paper. The oscilloscope to be written out, 4 is an abnormality determination circuit that analyzes the input signal A1 and detects the occurrence of an abnormality, 5 is an automatic reset circuit that automatically resets the abnormality determination output D1 of the abnormality determination circuit 4 and the external starting condition E1 individually, 6 is an This is an OR circuit that creates an OR condition for the output D3 of the automatic reset circuit 5 and outputs a start signal S1 as a start command to the oscilloscope 3.

Next, the operation will be explained. Input signal Alt! The signal is converted into a bit signal A2 by the input converter 1, stored in the analog memory 2 for a certain period of time, and then outputted to the oscilloscope 3 as an analog signal A3. On the other hand, the input signal A1 is judged by the abnormality determination circuit 4 as to whether or not there is an abnormality, and if there is an abnormality, an abnormality determination output D1 is output. If either the abnormality determination output D1 or the external starting condition E1 is satisfied, it is output to the OR circuit 6 via the automatic reset circuit 5, and a starting signal S1 is output to the oscilloscope 3 as a starting command. This oscilloscope 3 operates for a certain period of time. Here, the automatic reset circuit 5 is constituted by, for example, a circuit that pulses a signal. In this case, the output D3 of the automatic reset circuit 5 is the abnormality determination output D11 of the input startup condition! Take external start condition E1
Even if either of these continues to hold true, it will disappear after a certain period of time.

after that.

If an abnormality occurs in another input signal, it is output to the OR circuit 6 via the automatic reset circuit 5 in the same way as before, and a start command is given to the oscillograph 3 again to cause the oscillograph 73 to operate again for a certain period of time.

In the above embodiment, a circuit that pulses the signal is shown as the automatic reset circuit 5, but the automatic reset circuit 5 keeps the output ON when one condition is satisfied, and outputs only for a certain period of time when the other condition is satisfied. It is also possible to use a circuit that turns OFF. Also.

In the above embodiment, the explanation will be made assuming that there is one oscillograph operated by the activation signal S1, but the same effect can be obtained even if there are a plurality of oscillographs.

Further, in the above embodiment, the input conditions of the automatic reset circuit 50 are set at the same level as the activation condition, but this activation condition is divided into groups by the group discrimination circuit 7 as shown in FIG. 2, and the KOR condition is set for each group. may also be input to the automatic reset circuit 5, and the same effect as in the above embodiment can be obtained for each group, and in this case, the effect that the automatic reset circuit 5 can be particularly simplified is obtained.

〔Effect of the invention〕

As described above, 1.According to the present invention, since an automatic reset circuit is provided as a condition circuit for starting the oscillograph, even if the oscillograph once started continues to be satisfied, it can be restarted when another starting condition is satisfied. It has the effect of being able to be activated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an event analysis recorder according to one embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the invention, and FIG. 3 is a block diagram showing a conventional event analysis recorder. It is. Figure Ks? 1 is the input converter, 2 is the analog input converter,
3 is an oscilloscope, 4 is an abnormality determination circuit, 5 is an automatic reset circuit, 6 is an OR circuit, and 7 is a group discrimination circuit. In addition, in the drawings, the same reference numerals indicate the same or similar parts. Patent applicant: Mitsubishi Electric Corporation I−−□−” Agent: Patent attorney 1) Hiroshi Sawa Akiji
(2 other people) 1

Claims (2)

[Claims] (1) In an event analysis recorder that inputs an input signal and an external start condition and records data for a certain period of time going back to the past when an event such as an accident occurs, the start condition determined from the input signal and the external start condition An event analysis recorder characterized in that it is equipped with an automatic reset circuit that automatically resets each condition signal. (2) The above-mentioned automatic reset circuit is characterized in that it is equipped with a group discrimination circuit that groups a plurality of signals such as input signals and external starting conditions into groups, and automatically resets the starting conditions for each group. An event analysis recorder according to claim 1.