JPS6271409A - Malfunction display unit for generator plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an abnormality display device for a power generation plant, and in particular, it groups a large number of abnormality detection contacts arranged in a power generation plant, and collectively identifies abnormalities in one power plant in each group. The present invention relates to an abnormality display device for a power generation plant suitable for displaying an abnormality in a power generation plant.

[Technical Background of the Invention] In power generation plants such as thermal power plants and solar power plants, when an abnormal situation such as an accident occurs, it is necessary to quickly and accurately identify the location of the abnormality. Abnormality indicators are installed corresponding to abnormality detection contacts placed in each part of the power plant for monitoring. However, since a large number of abnormality detection contacts are arranged over a wide area in one power generation plant, if abnormality indicators were provided in one-to-one correspondence to the abnormality detection contacts, the number of one indicator would be enormous, and the installation space would be required. ,
It becomes impractical in terms of monitoring work. For this reason, an abnormality indicator is provided for each important item, but for abnormality detection contacts of relatively low importance, for example, each field equipment system is grouped together and displayed all at once on a single display. ing.

Part 5 @ shows a conventional example of such an abnormality display device, where la, lb, ... are grouped abnormality detection contacts, and 2a, 2b, ... are individual abnormalities. Detection contacts, 3a, 3b, ... are re-failure detectors, 4 is a collective display type failure display device, 5a, 5b are failure display circuits with re-failure indication, 6 is an individual type failure display device, 7a
, 7b, ... is an abnormality display circuit, 8a,
8b,..., 9a, 9b,... are lamp indicators, 10 is an alarm, 11 is a confirmation button, 12 is a reset button, 13 is a blinking signal circuit, P is a signal DC power supply be.

In the above configuration, in the case of individual display, for example, when the abnormality detection contact 2a is closed, the abnormality display circuit 7a is activated, and the lamp indicator 9a flashes with its display output. At the same time, the alarm 10 sounds with the alarm output from the abnormality display circuit 7a. When the operator confirms this and presses the confirmation button 11, the lamp display 9a becomes a continuous lighting display and the alarm stops. When the abnormality returns to normal, the abnormality detection contact 28 is opened and the lamp indicator 9a is turned off by pressing the reset button 12. At this time, if the abnormality continues,
Even if the reset button 12 is pressed, the lamp indicator 9a remains lit continuously (this operation is called a manual return type).

Next, in the case of batch display 1, for example, if even one of the abnormality detection contact group 1a is closed, the re-abnormality detector 3a generates an output, and the abnormality display circuit 5a with re-abnormality display is activated, as described above. In exactly the same manner as above, the lamp indicator 8a and the alarm 1
An alarm display operation based on 0 is performed. While this lamp indicator 8a is continuously displaying, if another contact in the abnormality detection contact group 1a closes.

The re-abnormality detector 3a outputs the re-occurrence of the abnormality using another signal line, restarts the abnormality display circuit 5a with a re-abnormality display, and changes the lamp indicator 8a from a continuous display to a blinking display again. At the same time, the alarm 10 is made to sound again. This allows the operator to know from the single lamp indicator 8a that another abnormality has occurred in the equipment system.

[Problems with Background Art] However, in the conventional configuration as described above, in order to collectively display abnormalities, for example, two signal lines are provided between the re-abnormality detector 3a and the abnormality display circuit 58 with re-abnormality display. Is required. That is, one is a signal line 1 for transmitting that one or more contacts in the abnormality detection contact group la are closed.
4a, and the other one is a signal line 15a that transmits a signal that is generated for a short time each time an individual contact in the abnormality detection contact group 1a closes.

In this case, the abnormality detection contact group 1a, lb, . . . and the re-abnormality detectors 3a, 3b, . is set up. In addition, lamp indicators Qa, 8b, ..., 9a arranged on the central control panel
, 9b, . . . have more than 100 points. Among them, - lamp indicators 8a, 8b, .
... is about 10%, and is likely to increase in the future as the plant scale increases.

Therefore, according to the conventional configuration described above, each lamp indicator 8a
, 8b, ..., two signal lines are required for each of Since the circuits are different, two types are required, and when changing the one-display method because they are not compatible.

There were problems such as complicated work.

[Object of the Invention] The present invention has the following advantages:
The number of input signal lines for each line has been reduced to one input signal line for each line, and the input wiring with the individual display has been unified, and the error display circuit for the 1 individual type and the batch display type is a general-purpose error display circuit (annunciator). It is an object of the present invention to provide an economical and rational abnormality display device for a power generation plant, which is compatible with the present invention and can flexibly deal with changes, expansions, etc. of the one-indicator type.

[Summary of the Invention] In order to achieve this object, the present invention provides a system for temporarily suspending the abnormality detection signal when a new abnormality occurs while the abnormality detection signal is being sent from the re-failure indicator installed on the field side. By doing so, the occurrence of an abnormality and the occurrence of another abnormality are transmitted to the central control panel using a single signal line, while the abnormality display device installed in the central control panel is used.

The present invention is characterized in that the abnormality display operation is repeated from the beginning every time the abnormality detection signal sent is momentarily interrupted.

[Embodiments of the invention] The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows a block diagram of an abnormality display device for a power plant according to an embodiment of the present invention.

In the figure, the same symbols as in FIG. 5 indicate the same or corresponding parts,
The difference from FIG. 5 is that the abnormality display circuit 5a with re-abnormality display;
5b," (hereinafter simply referred to as ANN circuits 5a and 5b).

) is an automatic reset function, and this general-purpose ANN circuit and abnormality display circuit 7a, 7
b.

...(Hereafter, simply ANN circuits 7a, 7b,
...) are made compatible by using modules with the same structure, and are housed collectively in the same case 16 of the central control panel, and each abnormality detector 3a r placed on the site side. 3b r... Each ANN circuit 5a is arranged in the central control panel at a considerable distance,
5b, one signal line each between 17a and 17b
, . . . and the reset signal r is connected to the re-abnormality detectors 3a, 3b, .

FIG. 2 shows each re-abnormality detector 3a and 3b in FIG.
.

-..., ANN circuits 5a, 5h,...
In order to explain the internal configuration of the ANN circuits 7a and 7, the re-abnormality detector 3a and the ANN circuits 5a and A will be used as representatives of each.
This shows the NN circuit 7a.

Reference numeral 18 in the re-abnormality detector 3a is a detection circuit for collective signals, which has an OR function to always output if one or more inputs in the contact group 1a are closed.

Reference numeral 19 denotes a detection circuit for individual generation, which outputs an instantaneous (approximately 0.5 second) output every time one of the contacts 1a closes.

22 operates upon receiving the output of the detection circuit 18, and the detection circuit 1
This is a holding circuit that holds the output until the reset signal r generated by pressing the reset button 12 in FIG. 1 while the output of the circuit 8 is cut off is input.

20 is a gate circuit that opens and closes the output of the holding circuit 22, and is a circuit that outputs an abnormality detection signal i that is instantaneously cut off every time the detection circuit 19 outputs.

On the other hand, the ANN circuit 5a has an automatic recovery function and operates as follows.

When the detection signal i is input, the ANN circuit 5a operates, and the lamp display 8a blinks with its display output.

At the same time, the alarm lO sounds with the alarm output of the ANN circuit 5a. The operator confirms this and presses confirmation button 11.

The lamp indicator 8a becomes a continuous display and the alarm stops.

Thereafter, when the detection signal i returns, the lamp indicator 8a goes out. The ANN circuit 7a has a manual return type function and operates in the same manner as explained in FIG.

Reference numeral 21 in the ANN circuits 5a and 7a is a holding circuit that stores the occurrence of an abnormality and operates upon input of the abnormality detection signal i.

There are two ways to recover by switching the switch 25.・If you are using the batch type to display an error again, connect the switch 25 to the (a) side and use it as the automatic reset type operation described above; if you are using the individual type to display an error, connect the switch 25 to the (b) side. Connect it and use it as the manual return type operation described above. The return condition is that when the switch 25 is on the (a) side, the holding circuit 23 sends a confirmation signal k.
If the detection signal i is already disconnected when the switch 25 is activated, or if the detection signal i is disconnected after that, the reset signal r is reset. It returns when it enters. In this way, the circuit holds the output until the above return condition is met.

23 is a holding circuit for continuously displaying the lamp, and when there is an output from the holding circuit 21, an output is generated by inputting the confirmation signal generated by pressing the confirmation button 11 in Fig. 1; This circuit holds the output of the holding circuit 21 until the output is cut off.

24 is an output circuit which receives the blinking signal f generated from the blinking signal circuit 13 in FIG. 1 and the output from the holding circuit 21.23, and outputs a lamp display signal a and an alarm signal S.

When the holding circuit 21 outputs and the holding circuit 23 stops outputting,
This circuit outputs a blinking signal f to blink the lamp and sound a buzzer, and when both the holding circuits 21 and 23 output, it stops the alarm signal and makes the lamp display signal Q a continuous signal.

The ANN circuits 5a and 7a both include R, F, L, and B at terminals I for inputting and outputting r, f, Q, and b to each of the above-mentioned circuits and each of the above-mentioned signals i, respectively. It is configured using the same module. However, in the case of the ANN circuit 5a, the switch 25 of the module is connected in advance to the (A) side as shown in the figure. In addition,
The operation of the ANN circuit 5a is generally called an automatic return system, which is a widely used function.
The present invention is not limited to the circuit shown in circuit 5a, and can be applied to both relay circuits and semiconductor circuits as long as the functions are the same.

Next, the operation of the abnormality display device of this embodiment configured as one or more will be explained with reference to the time chart shown in FIG.

Among the abnormality detection contact group 1a, the contact that closes first is Nα.
When one person applies the input, the detection circuit 18 generates an output, and the detection circuit 19 generates an instantaneous output for one hour. The holding circuit 22 receives the output of the detection circuit 18, holds it by itself, outputs it to the gate circuit 20, and holds the output until the reset signal r is input. The gate circuit 20 generates the abnormality detection signal i with a delay of L1 time from one hand power. The signal j enters the ANN circuit 5a, and the holding circuit 21 outputs and holds the output. In response to this, the output circuit 24 issues a lamp blinking output and an alarm output.The relationship between zero and more is as shown in the time chart of FIG.

After confirming these displays and the occurrence of one alarm, the operator presses confirmation button 11.
When is pressed, the signal k is input, and the holding circuit 23 operates because there is an output from the holding circuit 21, and holds the output.

Upon receiving the output, the output circuit 24 makes the lamp display signal α a continuous display signal and stops the alarm signal.

In this state, if N111 manual power continues, the output of the re-abnormality detector 3a will continue, and by pressing the reset button 12, even if the reset signal r is input, the holding circuits 21 and 23 will keep the output as it is. The lamp display signal Q and alarm signal S do not change.

In this state, when another contact Nα2 in the contact group 1a closes, the re-abnormality detector 3a receives it, and the detection circuit 19 instantaneously (for one hour) outputs to operate the gate circuit 20. The circuit output is cut off for 11.1 hours. After the lapse of 1+ hours, the gate circuit 20 outputs the output again, so the abnormality detection signal i becomes a signal whose output is momentarily interrupted for 1 hour due to Nα2 manual power.

The ANN circuit 5a operates as follows based on this signal.

That is, when the signal i is turned off, it is in a continuous lighting state after the confirmation operation, the output of the holding circuit 21 is also turned off, and the holding circuit 23 is also turned off. Therefore, since the output circuit 24 also stops, the lamp display signal Q changes to stop (light out) and the ANN circuit 5a
returns to the initial standby state. Next, after 11 hours, when the signal i is input again, the holding circuit 21 of the ANN circuit 5a operates, but the holding circuit 23 remains inactive, and the input state of the output circuit 24 becomes the same input condition as the failure occurrence. , the lamp display signal becomes a flashing signal and an alarm signal is also generated.

By this operation, the operator can confirm that an abnormality has occurred again within the group by monitoring the lamp indicator 8a as a - pattern display. Therefore, when the confirmation signal k is input by pressing the confirmation button 11, the holding circuit 23 is activated, the output circuit 24 makes the lamp display signal Q a continuous signal, and the alarm No. 48 is stopped.

When the abnormality is recovered and the contacts of Nα1 and Nα2 are opened, the lamp display 8a will remain displayed continuously unless the reset button 12 is pressed, but if the reset button 12 is pressed and the reset signal r is input, the abnormality will occur again. Holding circuit 2 in detector 3a
2 is released from holding and the output is cut off.

Therefore, the output of the gate circuit 20 is also cut off. In response to this, the ANN circuit 5a cuts off the lamp display signal.

Turn off the lamp indicator 8a. This brings us to the state before the 1-element abnormality occurred.

In this way, according to this embodiment, the abnormal state on the field side and the newly occurring re-abnormality can be detected from the re-abnormality detector 3a to the AN.
It can be transmitted to the N circuit 5a through one signal line 17a. Moreover, on the central control panel side, economical effects can be obtained, such as the ability to configure the ANN circuits 5a and 7a using modules of the same structure, and a general-purpose, inexpensive ANN circuit system. Furthermore, addition or change of abnormality detection contacts or A
Failures in the NN circuit can be easily dealt with by, for example, converting the modules in the case from individual display to batch display, or using spare modules.

FIG. 4 shows another embodiment of the re-abnormality detector 3a, in which the gate circuit 20 and holding circuit 22 inside the re-abnormality detector 3a in FIG. 2 are constructed with auxiliary relays. The detection function is the same.

In the configuration shown in FIG. 4, the - pattern signal detection circuit 18 is constituted by a diode OR circuit, and its function is the same as that in FIG.

D is a diode, 12 is an interlocking reset button, 12a is its a contact, and 12b is its b contact. 26°27 is the auxiliary relay, 27a I, 27a 2 is the auxiliary relay 27
The a contact point 26b is the b contact point of the auxiliary relay 26. D
s is a diode for preventing wraparound, other symbols are secondary
Since it is the same as the re-abnormality detector shown in the figure, the explanation will be omitted. In this case, the signal i is taken out from the same DC power supply P as the abnormality detection contact. To describe the operation of the auxiliary relay, the detection circuit 18
When there is no output, the auxiliary relays 27 and 26 are inactive and the signal i is cut off. When there is an output from the detection circuit 18, the auxiliary relay 27 operates, and the auxiliary relay 27 self-holds through the reset button 12b. Every time the detection circuit 19 operates, the auxiliary relay 26 instantaneously operates to cut off the signal i. If all the abnormality detection contacts have returned, the auxiliary relay 27 is returned to its original state by opening the circuit by operating the reset button 12, and enters the standby state. In this way, even if part of the re-abnormality detector 3a is configured with a relay circuit, the same function can be obtained.

In addition, in the above embodiments, the lamp indicator is made to blink every time an abnormality occurs in the power generation plant, and then it is turned on continuously by pressing the confirmation button, and then turned off by operating the reset button after the lamp returns to normal. As explained above, the display format can be changed as desired, such as red for alarm, yellow for confirmation, and green for normal status.

C Effects of the Invention] As described above, according to the present invention, since the re-abnormality detector has a holding function, the ANN circuit on the central control room side does not require a special ANN circuit of the re-abnormality detector.

In addition to being able to use a general-purpose ANN circuit as is, modules with the same circuit and structure can be used for the fault display circuits for collective display and individual display within the fault display device, reducing manufacturing costs. This also provides compatibility. Therefore, it is possible to flexibly deal with changes in display contents, additions, circuit failures, etc. after the abnormality display device is in operation, and an economically reasonable abnormality display device for a power generation plant can be obtained.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an abnormality display device according to an embodiment of the present invention, Fig. 2 is a detailed circuit configuration diagram of its main parts, Fig. 3 is a time chart for explaining its operation, and Fig. 4 is a main part of the present invention. A detailed circuit configuration diagram of a re-abnormality detector according to another embodiment of the invention, and FIG. 5 is a block diagram of a conventional abnormality display device. la, lb...abnormality detection contact group, 2a, 2b...
・Abnormality detection contacts, 3a, 3b... Re-abnormality detector, 4
...-Pattern display type abnormality display device, 5a, 5b... Abnormality display circuit with re-abnormality display, 8a, 8b, 9a
, 9b... Lamp indicator, 10... Alarm, 1
1... Confirmation button, 12... Reset button, 13...
Flashing signal circuit, 14a, 1.4b, 15a, 15b,
17a, 17b - Signal line, 16... Case, 18... - Pattern signal detection circuit, 19... Individual generation detection circuit, 20... Gate circuit, 21.22.23
...Holding circuit, 24...Output circuit, 25...Selector switch, 26.27...Auxiliary relay. ＼−１〆′ On the cloth obi〃 b Figure 3 Figure 4

Claims (2)

[Claims] (1) The operating status of the numerous abnormality detection contacts placed on the site side of the power generation plant is displayed on each display placed in the central control room for each abnormality detection contact individually and for each abnormality detection contact group. In an abnormality display device for a power generation plant that performs collective display, if even one abnormality detection contact is operating in a group of abnormality detection contacts, an output is output on the field side, but a new abnormality detection contact is activated. A re-abnormality detector is installed that momentarily shuts off the output every time a fault occurs, and maintains the output until an output reset signal is received from the main control room side even after all detection contacts have returned to operation. , an abnormality display circuit is provided which changes the display to a first display state every time the output is momentarily cut off upon receiving the output from the re-fault detector, and changes the display to a second display state when a confirmation button is pressed. An abnormality display device for a power generation plant, characterized by: (2) In claim 1, the abnormality display circuit is configured to have an individual type and a collective type using the same module, so that it can be adapted to the individual type or the collective type by switching operation of a changeover switch. An abnormality display device for a power generation plant characterized by: