JPS6056371B2 - 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. Inspection and testing of these relays are performed by operating the inspection pushbutton 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, monitor malfunctions of the relays during operation, and notify which relay is malfunctioning.

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 each relay device is inspected, and 3 is a sequence timer, which is preset from 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 period of time passes.

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 is 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. ing. 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 11 for restoring the display of the indicator lights 4a to 4n.
The signal emitted by closing the is given. FIG. 2 shows an example of relay devices 1a to 1n.
This is a configuration that outputs a monitoring output P if the relay device is normal when an inspection command is given, and completes this within a certain period of time (in the example shown in the figure, within the time period during which sequence timer 3 is in state 2). It is said that There is. Therefore, if the relay device is abnormal, the monitoring output P is not outputted, or even if it is outputted, it is not completed even after a certain period of time has elapsed. In the same figure, X is a relay to be inspected and monitored, and is for tripping a line breaker in response to an overvoltage on a given system line, for example. Y is a relay for duplicating the logic circuit of the relay, which will be described later, together with relay X. The voltage of the system line is given to the transformer TR, which is connected to the rectifier circuit D1, the smoothing circuit F1, the level detection circuit L
Dl is applied to relay X via time limit circuit TM.

The time limit circuit TM detects the voltage of the system line by the level detection circuit LDl.
It is designed so that it will not operate immediately when the voltage exceeds the voltage determined by . This time limit 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 LDl, from that point on, the time limit circuit T
Relay X operates when a certain time set by M has elapsed, and relay Y operates when the level exceeds the set level of level detection circuit LD2 (which is the same as the set level of circuit LDl). An auxiliary relay circuit SR is provided attached to relays X and Y. Auxiliary relays SX and SY are shown here.
and contacts SXl to SX3 of auxiliary relay SX, contacts Syl to Sy3 of auxiliary relay SY, and contacts X1 to SX of relay X.
A circuit is constituted by X4, the contact of relay Y, and points h to Y4. Note that a constant voltage circuit D■ 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, assume that an inspection command ■ is given from the circuit shown in Fig. 1. If you want to inspect the relay device alone, close the manual switch MS. This activates the auxiliary relay SX, First, the contact SXl
When turned on, it is self-held via contact X1 (or y1). Further, when the contact SX2 is turned on, the auxiliary relay SY is operated. Here, both auxiliary relays SX, S
Since the contacts SX3 and Sy2 are both turned on due to the operation of Y, voltage is inputted 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 LD1 and LD2, this first operates relay Y and switches its connection to h. Also, contact Y2 is turned on and auxiliary relay SY is self-held. Before this, contact SX
2, a monitoring output P is output to the monitoring output terminal VT via the diode DD. When the contact Y3 is switched, the monitoring output P is also output from the circuit passing through the contacts X3 and y3. When the time set in the time limit circuit TM has elapsed after the relay Y is activated, the relay X is activated and its contact X3 is switched.

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
Y will also return. Furthermore, when the contact SX2 is turned off, the monitoring output P that has been continuing to be output 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 TP being given, but the monitoring output P is not terminated based on the return of the auxiliary relay SY. I will do it. 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 as contact SX2 does not turn off, 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. That is, when the relay X is out of order, the monitoring output P will still be output even after a certain period of time has elapsed. The time chart at this time is shown in the third
This is diagram B. 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
It returns when yl is turned off, but auxiliary relay SY contacts due to failure of relay X to return! does not turn off and remains on forever. Therefore, the auxiliary relay SY does not return, and accordingly, contacts X2, Syl, and diode DD
As a result, the monitoring output P is not completed even after the time limit of the time limit circuit TM has elapsed. FIG. 3C shows a time chart at this time. The same applies when relay Y causes a return failure. In the above configuration, if the auxiliary relay SX fails and does not operate,
Contact SX2 is not turned on, so no monitoring output is produced 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 X4 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. Furthermore, if the relay X (or Y) operates even though there is no input during non-inspection, the contact X3 (or Y3) will switch, so the monitoring output P will be output at this time. Returning now to FIG. 1, the sequence timer 3 is set when inspecting the relay device. This set includes a signal issued by turning on the manual inspection switch 12 or a timer 1 every 2@ intervals.
This is performed by the set output of the start-up memory circuit 15, which is set by the output of the OR circuit 14 which receives the signal from 3 as input. Note that before this activation, the sequence timer 3 is reset by a reset signal from the initial set circuit 16, and is activated by the output of an OR circuit 17 which receives the reset signal and the signal output when the sequence timer 3 times up. Memory circuit 15 is reset. When the activation memory circuit 15 is set as described above, the activation indicator light 18 lights up and the sequence timer 3 shifts from the O 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 TP is given to all the relay devices 1a to 1n at the same time, and the inspection operation explained 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 normal 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 2, then it should be approximately 2. 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 receives the signal d and the monitoring output P, which passes through the OR circuit 7 and sets the memory circuit 2a again, resulting in a set output (abnormality detection output). issue.

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 input to the OR circuit 27, and the output thereof is one input of the AND circuit 28, so that an output is output from the AND circuit 28 in response to the signal d and the memory circuit 5 is input! set. Due to this set output, the indicator light 29 lights up to indicate this, and the relay 30 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. For example, if the relay device 1a is unable to recover during inspection, the monitoring output P is still output even when the sequence timer 3 shifts to the 3rd state, so the relay device 1a performs the same operation as when it is inoperative as described above. The memory circuits 2a, 5 perform the display 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 sequence timer 3 subsequently shifts to state 4, signal e is output to the OR circuit. ．． AND circuit 26a after passing through 2'5
~26n, the indicator light that was lit earlier continues to be lit.The signal e is input to the AND circuit 3.
It is given as one input of 3. 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. Indicator light 35 that displays
lights up, and the relay 36 operates, turning on the contact 37 and resetting 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 set. Furthermore, the fourth
Figure A shows the time charts when the relay device 1a is normal, and Figure 4B shows the time charts when it is inoperative. Next, constant monitoring will be explained.

For example, assume that relay X of relay device 1a malfunctions due to a failure and 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 the case where relay
comes out. Therefore, the indicator light 4 operates in the same manner as described above.
2 lights up and the relay 43 operates. Note that when the relay X or Y malfunctions as described above, its contact N1 or y1 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. When the relay 43 operates, its contact 45 also closes,
At this time, the activation memory circuit 15 is set via the OR circuit 12.

Therefore, as described above, an inspection command is given to each relay device, one of the memory circuits 2a to 2n corresponding to the abnormal relay device is set, and one of the indicator lights 4a to 4n lights up. This lighting makes it possible to determine which relay device is abnormal.
Furthermore, in the case of an abnormal relay device, the auxiliary relay SY does not recover as described above, so it is possible to prevent the abnormal relay device from outputting a trip output. As detailed above, according to the present invention, it is possible to centrally 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. Furthermore, it is possible to monitor malfunctions of each relay device during operation, and it is also possible to automatically detect which relay device has malfunctioned, and to lock its trip circuit.

[Brief explanation of the drawing]

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 FIG. 4A. 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...
...Continuous monitoring timer, 7, 8...OR circuit, 9,10...AND circuit, 43...Relay, 45...Contact, X , Y...Relay, S
X, 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 device for notifying an abnormality in a relay device corresponding to a storage circuit by output of a storage circuit according to the invention, a detection device for outputting an output during non-inspection based on the monitoring output to detect an abnormality in the relay device, and this detection device and a device that generates the inspection command based on the output of the relay inspection monitoring device.