JPS6056372B2 - Inspection and monitoring device for relays - Google Patents

Description

[Detailed description of the invention] The present invention relates to a relay inspection and monitoring device.

As is well known, relays are widely used in control and various systems. In order to improve the performance and reliability of these controls and systems, it is necessary to improve the performance and reliability of these relays. In response to this demand, relays with inspection and testing functions added to stand-alone relays have been manufactured and used. These are used to perform inspections, tests, etc. by operating the inspection push button provided on the front of the relay body. In such a configuration, the control,
The above-described inspection operation is required for all relays used in the system, which is extremely troublesome. Or even if a relay malfunctions during control or system operation,
There is also the inconvenience that failure of the relay cannot be discovered unless the above-mentioned inspection operation is performed. The object of the present invention is to make it possible to centrally inspect a large number of relays, and also to monitor malfunctions of the relays during operation.

An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1a to 1n are relay devices to be inspected and monitored;
~2n is a memory circuit (for example, a flip-flop) that stores each monitoring output p when inspecting each relay device, and 3 is a sequence timer, which is preset from the 0 state to the 4th state, and when reset. When set in the 0 state, it automatically shifts from the 1 state to the 4 state as a predetermined time period elapses.

Signals a to e are output in each of states 0 to 4, respectively.

4a to 4n are indicator lights (e.g., light emitting diodes) that indicate an abnormality and are lit according to the set outputs of the memory circuits 2a to 2n.

same as below. ), 5 is a memory circuit that is set when any one of the relay devices is abnormal during inspection, and 6 is a monitoring timer that is set when any one of them becomes abnormal during operation of the relay device. Then, when the abnormal condition continues even after a predetermined time limit has elapsed, an output is output. The output of the OR circuit 7 is applied to the set input of each of the memory circuits 2a to 2n, and the output of the OR circuit 8 is applied to the reset input. One input of the OR circuit 7 receives the output of an AND circuit 9 which receives the monitoring output P of the corresponding relay device and the signal d of the sequence timer 3, and the other input receives the signal b. It is being One input of the OR circuit 8 is the output of the AND circuit 10 which receives the monitoring output P and the signal c, and the other input is the switch 1 for restoring the display of the indicator lights 4a to 4n.
The signal emitted by closing 1 is given. Fig. 2 shows an example of relay devices 1a to 1n.When an inspection command is given, if the relay device is normal, it outputs a monitoring output P and outputs it within a certain period of time (in the example shown in the figure). In this case, the sequence timer 3 is configured to finish within the time period in which the sequence timer 3 is in the 2 state. Therefore, if the relay device is abnormal, it will not output the monitoring output P, or even if it outputs it, it will only output it for a certain period of time. It is structured so that it does not end even after the period has passed. In the figure, X is a relay to be inspected and monitored, for example, in response to an overvoltage on a given system line, to trip a break in the line. Y is trip X
The logic circuit of the relay will be described later! This is a relay for duplication. The voltage on the system line is applied to a transformer TR, which is applied to a relay X via a rectifier circuit D, a smoothing circuit F, a level detection circuit LDl, and a time limit circuit TM.

The time limit circuit TM detects the level of the voltage on the system line and detects the level of the circuit LD.
It is provided so that it will not operate immediately when the voltage determined by l is exceeded. This time limit circuit is set within the above-mentioned fixed time. Relay Y is operated by the output of level detection circuit LD2, which is supplied with the same input as that supplied to level detection circuit LDl. In this configuration example, when the input voltage exceeds a certain level set in the level detection circuit LD1, and after a certain time set in the time limit circuit TM has elapsed, the relay (This is the same as the setting level of the circuit LDl), the relay Y operates. An auxiliary relay circuit SR is provided attached to relays X and Y. l Auxiliary relays SX, S are shown here.
Y and contacts SXl to SX3 of auxiliary relay SX, contacts Syl to Sy3 of auxiliary relay SY, and contact X1 of relay X
~X4, the contact of relay Y, and h~Y4 constitute a circuit. Note that a constant voltage circuit DV is connected between the DC power supply terminals, and the constant voltage from this is given as the operating voltage of the level detection circuits LDl, LD2 and the time limit circuit TM. In these configurations, it is now assumed that an inspection command π is given from the circuit shown in FIG. If you want to inspect the relay device alone, close the manual switch MS. This causes the auxiliary relay SX to operate, and when its contact SX1 is first turned on, it is self-held via the contact X1 (or y1). Further, when the contact SX2 is turned on, the auxiliary relay SY is operated. Here, both auxiliary relays SX, SY
As a result of the operation, both contacts SX3 and Sy2 are turned on, so that voltage is input from the constant voltage circuit DV to both level detection circuits LDl and LD2. Since this input voltage is set higher than the set level of both circuits LDl and LD2, this first operates relay Y and switches its contact Y3. Also, contact Y2 is turned on and auxiliary relay SY is self-held. Before this, by turning on the contact SX2, the monitoring output terminal VT is connected via the diode DD.
outputs a monitoring output P. When the contact Y3 is switched, the monitoring output P is also output from the circuit passing through the contacts X3 and y3. After relay Y operates, time limit circuit TM
When the predetermined time has elapsed, relay X operates and its contact X3 switches.

Also, since both relays X and Y are in the operating state, both contacts Xl and yl (both are normally closed contacts).
is turned off. At this time, since the inspection command TP is not given, the auxiliary relay SX is released from its self-holding state and returns to its original state. Due to this return, contact SX3 is turned off, so the input voltage to relays X and Y disappears, and both relays
will also return. Furthermore, when the contact SX2 is turned off, the monitoring output P that has continued to be output until then is terminated. When relays X and Y return, contacts X2 and y2 turn off, and auxiliary relay SY returns to normal. The above operation is performed when relays X, Y and the auxiliary relay are all healthy, and FIG. 3A shows this time chart. As can be understood from the above explanation and FIG. 3A, the monitoring output P is issued based on the inspection command ■ being given, but the monitoring output P is issued based on the return of the auxiliary relay SY.
will end. However, even if relay Y operates, it is assumed that relay X is malfunctioning and does not operate. In this case as well, auxiliary relays SX and SY operate, and monitoring output P is produced by the operation of auxiliary relay SX. However, since relay X is inoperative, auxiliary relay SX does not return, and since contact SX2 does not turn off accordingly, auxiliary relay SY also does not return. Therefore, the monitoring output P does not end even after the time limit of the time limit circuit TM has elapsed. In other words, when relay X is out of order,
This means that the monitoring output P is still being output even after a certain period of time has elapsed. FIG. 3B shows a time chart at this time. Note that even if relay Y does not operate and only relay become. Also, during inspection, even if both relays X and Y operate, if relay X has a reset failure, auxiliary relay SX will close contacts
However, the auxiliary relay SY is not in contact due to the failure of relay X to return. does not turn off and remains on forever. Therefore, auxiliary relay SY does not return,
Accordingly, the monitoring output P is not completed even after the time limit of the time limit circuit TM has elapsed through the contacts X2, Syl, and the diode DD. FIG. 3C shows a time chart at this time. The same applies when relay Y causes a return failure. Note that in the above configuration,
If the auxiliary relay SX fails and does not operate, the contact SX2 will not turn on, and therefore no monitoring output will be output from the beginning.

If auxiliary relay SY fails and does not operate, both relays X and Y do not operate, so the monitoring output P is not completed, as described above. TR is a trip circuit, and is composed of a series circuit of contacts Xl and y4 of relays X and Y, which are turned on when relays X and Y operate, and a contact Sy3 and a trip coil TW. When relays X and Y are in operation, when contacts X4 and y4 are both turned on, trip coil TW
operates, tripping the grid circuit breakers. At the same time, contact Tr is turned on, short-circuiting the series circuit of contacts X4, y4, and Sy3, and continuing the trip state. Note that during inspection, contact Sy3 is off, so it will not trip even if relays X and Y operate. That is, the trip circuit TR is thereby locked. Also, if relay X (or Y) operates even though there is no input during non-inspection, contact X3 (
or Y3) is switched, so the monitoring output P is output at this time. Returning now to FIG. 1, the sequence timer 3 is set when inspecting the relay device. This set is a start-up memory circuit 15 that is set by the output of an OR circuit 14 which receives a signal generated by turning on the manual inspection switch 12 or a signal generated from a timer 13 every two bridges. This is done by setting output. Note that before this activation, the sequence timer 3 is reset by a reset signal from the initial reset circuit 16, and is activated by the output of an OR circuit 17 which receives the reset signal and a signal generated when the sequence timer 3 times up. Memory circuit 15 is reset. When the startup memory circuit 15 is set as described above, the startup indicator light 18 lights up and the sequence timer 3
shifts from the previous 0 state to the 1 state. The duration of one state is set shorter than the duration of the monitoring output P output when the relay device is normal.

The inspection command circuit 19 is activated by the signal b generated by the shift to the 1 state, and the indicator light 2 displays this fact.
0 lights up, the relay 21 operates and its contact 22 turns on.

As a result, the inspection command (2) is given to all the relay devices 1a to 1b, and the inspection operation described with reference to FIG. 2 is started. At this time, the memory circuits 2a to 2n are set by the signal b through the OR circuit 7. This setting produces a set output (abnormality detection output), but at this time none of the indicator lights 4a to 4n are lit yet.
Sequence timer 3 then shifts from state 1 to state 2.

The duration of the two states is set to such an extent that the monitoring output P output when the relay device is in a normal state does not end during the two states.

As a specific example, the time limit time of the time limit circuit TM in FIG. 2 is 1.
If it is a scolding, it should be about 2D1+. For example, if the relay device 1a is normal, the future monitoring output P
is still output immediately after the sequence timer 3 shifts to the 2nd state. Therefore, an output is output from the AND circuit 10 which receives the monitoring output P and the signal C as input, and this output passes through the OR circuit 8 and becomes a reset input of the memory circuit 2a, thereby resetting it. As a result, the set output from the memory circuit 2a that was output due to the previous set is terminated. The monitoring output P ends during the period when the sequence timer 3 is in the 2 state. However, if relay device 1a
If the memory circuit 2a fails and does not operate, the memory circuit 2a is reset in the same way as described above immediately after shifting to the 2nd state, but it does not end even during the 2nd state, and the sequence timer 3 then resets. Immediately after shifting to the third state, an output is output from the AND circuit 9 which inputs the signal d and the monitoring output P, and this output passes through the OR circuit 7 to the memory circuit 2.
Set a again and output a set output (abnormality detection output).

The signal d passes through an OR circuit 25 and then passes through AND circuits 26a-2.
6n, the set output of the set memory circuit 2a causes the AND circuit 2
An output is output from 6a to light up the indicator light 4a which indicates an abnormality. The set outputs of the memory circuits 2a to 2n are O. A circuit 27
Since the output is one input of the AND circuit 28, an output is output from the AND circuit 28 in response to the signal d, and the memory circuit 5 is set. Due to this set output, the indicator light 29 lights up to indicate this, and the relay 30 also turns on. It operates to close its contact 31. This gives an alarm signal or the like. The memory circuit 5 is set if any one of the memory circuits 2a to 2n is set when the signal d is output. During inspection, for example, if the relay device 1a is unrecoverable or hot, the monitoring output P is output even when the sequence timer 3 shifts to the 3rd state, so the same operation as when the relay device 1a is inoperable as described above will occur. The memory circuits 2a, 5 perform this, and the indicator lights 4a,
29 lights up and the relay 30 operates.

Note that if the auxiliary relay SX of the relay device 1a is out of order and does not operate from the beginning, the monitoring output P will not be output from the beginning. At this time, after the memory circuit 2a is set when the sequence timer 3 shifts to the 1 state, the 2
Not reset even when shifted to state. That is, since the set output is continuously output from the memory circuit 2a, the indicator light 4a lights up in the three states, and the other parts perform exactly the same operation as when the relay device 1a is in failure. Although the above explanation was about the relay device 1a, the same applies to other relay devices.

When the sequence timer 3 subsequently shifts to the 4th state, the signal e passes through the OR circuit 25 and then goes through the AND circuits 26a to 26.
Since the signal is input to n, the indicator light that was lit earlier continues to be lit. Signal e is given as one input to AND circuit 33. All reset outputs of the memory circuits 2a to 2n are applied to other inputs of the AND circuit 33. Therefore, when all the relay devices 1a to 1n are normal, a reset output is output from the memory circuits 2a to 2n, an output is output from the AND circuit 33, and the inspection normal circuit 34 is activated, indicating that. The indicator light 35 is turned on, and the relay 36 is operated to turn on its contact 37 and reset the timer 13. When the sequence timer 3 completes the four states and times up, the signal from now on passes through the OR circuit 17 and resets the activation memory circuit 15.

Also, the sequence timer 3 returns to the initial O state. To restore the lit indicator lamps among the indicator lamps 4a to 4n, turn on the switch 11, and the signal generated thereby is input to the OR circuit 8, and the previously set memory circuit 2a ~Reset 2n. This causes the indicator light to return to normal. At the same time, the memory circuit 5 is also reset. Note that FIG. 4 shows time charts when the relay device 1a is normal, and FIG. 4B shows each time chart when it is inoperative. Next, constant monitoring will be explained.

For example, assume that relay X of relay device 1a fails and malfunctions even though the input voltage is zero. Then, the monitoring output P is generated by switching the contact X3, but at this time, the OR circuit 4 which inputs the monitoring outputs of all the relay devices 1a to 1n
An output is output from 0 and becomes one input of the AND circuit 41. The other one of the AND circuits 41 is the memory circuit 15
Since the reset output (which is output at times other than inspection) is provided, the AND circuit 41 outputs an output based on the output from the OR circuit 40. Since this output sets the memory circuit 6, the set output turns on the indicator light 42, operates the relay 43, closes its contact 44, and operates the alarm circuit and others. The above explanation is based on a case where relay X malfunctions, but even when relay Y malfunctions, monitoring output P is output by switching contact J3. Therefore, it operates in the same manner as described above, the indicator light 42 lights up, and the relay 43 operates. Note that when the relay X or Y malfunctions as described above, its contact \ or Y4 closes, but at this time the trip coil TW of the trip circuit TR is not energized at all. In other words, at this time, the breaker is not tripped at all. As detailed above, according to the present invention, it is possible to collectively inspect a large number of relay devices, and the operation is extremely simple as it is only necessary to give a signal for an inspection command to all relay devices. This also has the effect of being able to monitor malfunctions of each relay device during operation.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram of a relay device, FIGS. 3A to 3C are time charts for explaining the operation of FIG. 2, and FIGS. FIG. 4B is a time chart for explaining the operation of FIG. 1. 1a to 1n...Relay device, 2a to 2n...
...Memory circuit, 4a-4n...Indicator light, 6...
...Constant monitoring timer, 7, 8...OR circuit, 9,10...AND circuit, X, Y...
・Relay, SX, SY...Auxiliary relay.

Claims (1)

[Claims] 1. Outputs a monitoring output when an inspection command signal is given or in an abnormal state, and causes the monitoring output to end within a certain time period when the relay to be inspected and monitored during inspection is normal;
a plurality of relay devices that output the monitoring output even after the predetermined time period when the relay is abnormal; a memory circuit provided corresponding to each relay device; a sequence timer that outputs a signal; a circuit that sets the memory circuit by the signal in the first state of the sequence timer; and a circuit that sets the memory circuit by the signal in the second state and each monitoring output. a circuit for resetting, a circuit for setting a memory circuit by a monitoring output that was not completed during the second state due to an abnormality in the relay device, and a signal in the third state; and this set. A relay inspection system comprising: a device that notifies an abnormality in a relay device corresponding to a storage circuit by using an output from a storage circuit; and a device that outputs an output during non-inspection based on the monitoring output to notify an abnormality in the relay device. monitoring equipment.