JPH0126248B2 - - Google Patents

Description

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

Regarding this type of device, we are currently looking at a separate proposal for one that can centrally inspect multiple relays. The previously proposed configuration is such that an inspection command is given to the relay to be inspected at any time, and it is determined whether each relay is normal or abnormal (non-operating, unable to return, etc.). This is extremely advantageous in that inspection operations and judgments can be centralized compared to the case where each relay is inspected separately.

By the way, each relay to be inspected is, for example, a protective relay (for example, a voltage differential relay, an overcurrent relay, an undervoltage relay, etc.), and the system and electrical equipment to be protected by these relays (for example, phase adjustment equipment, etc.) are When the relays are not in use, there is no problem in inspecting each relay, but if the relays are put into use during inspection, the inspection results may be misjudged. However, no measures were taken in this regard in the previously proposed configurations.

This invention improves the previously proposed configuration, and
The purpose of this system is to avoid misjudgment of inspection results by stopping the inspection in progress when an external disconnector that puts electrical equipment, etc. into use or non-use status is turned on during an inspection. It is something.

Embodiments of the invention will be described below with reference to the drawings.
In FIG. 1, 1a to 1n are relay devices to be inspected (for example, static protection relays), 2a to 2
n is the operating signal VP when inspecting each relay device
A memory circuit (for example, a flip-flop) that stores 0 state, 3 is a sequence timer, and
The state is preset, and when it is reset, it is in the 0 state, but when it is set, it automatically shifts from the 1st state to the 4th state as a predetermined time period elapses. go. Signals a to e are output in each state. 4
Numerals a to 4n are indicator lights (e.g. light emitting diodes; the same applies hereinafter) that light up in response to the set outputs of the memory circuits 2a to 2n, and 5 is an indicator lamp that lights up when any one of the relay devices is abnormal during inspection. The memory circuit 6 that is set is a memory circuit for constant monitoring that is set when any one of the relay devices is in an abnormal state during non-inspection operation.

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 has an operating signal for the corresponding relay device.
The output of an AND circuit 9 which receives VP and the signal d of the sequence timer 3 as inputs is given, and the signal b is given to the other input. One input of the OR circuit 8 is the output of the AND circuit 10 which receives the operation signal VP and the signal C, and the other input is the output of the AND circuit 10 which receives the operation signal VP and the signal C. The signal emitted by the signal is given.

FIG. 2 shows an example of the relay devices 1a to 1n. When the inspection command TP is given, if the relay device is normal, it outputs the operation signal VP.
The configuration is such that this process is completed within a certain period of time (in the example shown, within the time period during which the sequence timer 3 is in the second state). Therefore, if the relay device is abnormal, the operation signal VP is not output, or even if it is output, it is not completed even after a certain period of time has elapsed. In the figure, X is a relay to be inspected, which is used to trip a circuit breaker in the system in response to an overvoltage in the system, 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 to be protected by the relay devices 1a to 1n is given to the transformer T, which is applied to the rectifier circuit D, the smoothing circuit F, the level detection circuit LD ₁ and the time limit circuit.
It is given to relay X via TM. Time limit circuit TM
is provided so that it will not operate immediately when the voltage on the system line exceeds the voltage determined by the level detection circuit _LD1 , and its time limit is set within the above-mentioned fixed time. Relay Y is operated by the output of level detection circuit LD ₂ to which the same input as that applied to level detection circuit LD ₁ is applied. In this example configuration, the input voltage is connected to the level detection circuit.
When set to LD ₁ and exceeds a certain level,
From then on, when a certain time set in the time limit circuit _TM has elapsed, the _relay Y works.

An auxiliary relay circuit SR is provided attached to relays X and Y. This is the auxiliary relay SX, SY,
Contacts sx ₁ to sx ₃ of SZ and auxiliary relay SX, contacts sy ₁ to _{sy 4} of auxiliary relay SY, contacts sz of auxiliary relay SZ and contacts x ₁ to x ₅ of relay X, contacts y ₁ to y of relay Y
The circuit is made up of y ₅ . auxiliary relay
SZ operates when an inspection permission signal AP, which will be described later, is given, and returns when this signal AP is finished when it becomes necessary to cancel inspection. Note that a constant voltage circuit DV is connected between the DC power supply terminals P and N, and the constant voltage from now on is connected to the level detection circuit LD ₁ ,
LD ₂ is given as the operating voltage of the time limit circuit TM and as the input voltage of the level detection circuits LD ₁ and LD ₂ during inspection.

In these configurations, it is now assumed that an inspection command is given from the circuit shown in FIG. Or suppose that the manual switch MS is closed in an attempt to inspect the relay device alone. This causes the auxiliary relay SX to operate, and its contact _sx1 is first turned on. If inspection permission signal AP is given at this time, auxiliary relay SZ is in operation, so its contact sz
and contact sx ₁ , auxiliary relay via contact x ₁ (or y ₁ )
SX is self-maintaining. Further, when the contact _sx2 is turned on, the auxiliary relay SY is operated. At this point, the auxiliary relays SX and SY operate, causing the contact to
Since both sx ₃ and sy ₂ are turned on, voltage is input from the constant voltage circuit DV to both level detection circuits LD ₁ and LD ₂ . Since this input voltage is set higher than the set level of both circuits LD ₁ and LD ₂ , this first operates relay Y and switches its contact y ₃ . In addition, contact _y2 is turned on and auxiliary relay SY is self-held. As a result, the check output VP was previously activated via the diode DD by turning on the contact _sx2 .
issue. When contact _y3 switches, contact
The operating signal VP is output from the circuit passing through x ₃ and y ₃ as well as when the contact sy ₄ is turned on.

When the time set in the time limit circuit TM elapses after relay Y operates, relay X operates and its contact _x3 switches. Also, since both relays X and Y are now in operation, both contacts x ₁ and y ₁
is turned off. At this time, since the inspection command TP is no longer given, the auxiliary relay SX releases its self-holding state and returns to normal. Due to this restoration, contact _sx3 is turned off, so that the input voltage to relays X and Y disappears, and both relays X and Y are also restored. Due to this return, contacts x ₂ and y ₂ are turned off, and auxiliary relay SY is also returned to normal. Due to these restorations, the operation signal VP that had been being outputted until then is terminated. The above operation is performed when relays X, Y and auxiliary relays SX, SY are all healthy, and FIG. 3A shows this time chart.

However, even if relay Y operates, relay
Suppose that it is broken and does not work. Even in this case, auxiliary relays SX and SY operate, and the operation signal VP is generated by the operation of auxiliary relay SX. However, since relay X is inoperative, auxiliary relay SX does not return, and as contact sx ₂ does not turn off, auxiliary relay SY also does not return.
Therefore, the operation signal VP does not terminate even after the time limit of the time limit circuit TM has elapsed. FIG. 3B shows a time chart at this time. Note that even if only relay X operates without relay Y, the auxiliary relays SX and SY operate but do not return, so the operation signal VP is not completed. In other words, the state is the same as when relay X is inoperative.

Also, during inspection, even if both relays X and Y operate, if relay X has a reset failure, auxiliary relay SX will reset by turning off contacts x ₁ and y ₁ , but auxiliary relay SY will not. , contact _x2 does not turn off due to failure of relay X to return and remains on forever, so it does not return. Therefore, there are ₂ contacts,
xy ₁ , the operation signal VP is not completed after passing through the diode DD. FIG. 3C shows a time chart at this time. The same applies when relay Y causes a return failure.

Note that if the auxiliary relay SX fails and does not operate, the contact sx ₂ will not turn on, so the inspection output VP will not be output from the beginning. If auxiliary relay SY fails and does not operate, both relays X and Y will not operate, so operate signal VP as described above.
I can't finish it. If the auxiliary relay SX does not return, the end point sx ₂ will not turn off, so the operation signal VP will not complete, and if the auxiliary relay SY does not return, the contact sy ₄ will not turn off, so the operation will not occur. Signal VP does not finish.

In Figure 2, TR is a trip circuit, AR is an alarm circuit, and when relays X and Y operate, the contact
When x ₄ and y ₄ are turned on, the trip circuit TR is completed and the disconnector is tripped, and when contacts x ₅ and y ₅ are turned on, the alarm circuit is completed and an alarm is issued. However, during inspection, contact sy ₃ is turned off, so relays
Even if Y operates, each circuit TR, AR is not completed.

During non-inspection, if one of relays
Since x ₃ or y ₃ is switched, at this time the operation signal VP
will be output.

Returning now to FIG. 1, the sequence timer 3 is set when inspecting the relay device. This setting is performed by the set output of the activation memory circuit 13, which is set by the output of the OR circuit 12. Note that, prior to this activation, the sequence timer 3 is reset by a reset signal from the initial reset circuit 14, and the activation memory circuit 13 is reset by the output of the OR circuit 15. When the startup memory circuit 13 is set as described above, the forced inspection circuit 16 is set by the set output.
operates to turn on the contact 16a and give an inspection permission signal AP to each relay device. When the circuit breaker is opened, a constant inspection permission signal AP is generated through contact 17 of the contacts 17 and 18, which are turned off when the circuit breaker is turned on and turned on when the circuit breaker is opened.
is given to each relay device. This is to allow inspection using the manual switch MS shown in FIG. 2, provided that the breaker is opened.

On the other hand, when the activation memory circuit 13 is set, the indicator light 19 lights up, and the sequence timer 3 shifts from the 0 state to the first state. The duration of the first state is set to be shorter than the duration of the operation signal VP output when the relay device is normal. The inspection command circuit 20 is activated by the signal b generated by the shift to the first state, and the indicator light 21 indicating this fact lights up, and the relay 22 is activated and its contact 22a is turned on. . As a result, the inspection command TP is given to the relay devices 1a to 1n at any time, and the inspection operation explained with reference to FIG. 2 is started. Also, the signal b at this time causes the memory circuit 2 to pass through the entire OR circuit 7.
a to 2n are set. This setting produces a set output (abnormality detection output). However, at this time, none of the indicator lights 4a to 4n are lit yet. Furthermore, the memory circuit 23 is set by the signal b.

Sequence timer 3 then shifts to the second state. The duration of the second state is set to such an extent that the operation signal VP output when the relay device is normal does not end during the second state. As a specific example, the time limit time of the time limit circuit TM in Fig. 2 is 6.
If it is seconds, then the duration of the first state is 0.2 seconds,
The duration of the second state may be 7.8 seconds. Assuming that the relay device 1a is normal, the future operation signal VP is still being output immediately after the sequence timer 3 shifts to the second state. Therefore, an output is output from the AND circuit 10 which receives the operation signal VP and the signal C as input, and this output passes through the OR circuit 8 and becomes the reset input of the memory circuit 2a.
Reset this. As a result, the output from the memory circuit 2a that had been output due to the previous setting is terminated. Other relay devices also exhibit the same operation if they are normal. Therefore, memory circuit 2
If the set outputs of a to 2n are used as determination signals, these determination signals will be issued only during the period when the sequence timer 3 is in the first state. The sequence timer 3 then shifts to the third and fourth states, and when the time is up, the signal from this time passes through the OR circuit 15 and resets the activation memory circuit 13. Also, the sequence timer 3 returns to its initial 0 state. With the above steps, the inspection operation is completed. FIG. 4A shows a time chart in this case.

However, suppose that one of the relay devices, for example, relay device 1n, is out of order and the operation signal VP is not output from the beginning. At this time, even if the sequence timer 3 is shifted to the second state, the memory circuit 2n is not reset.
Therefore, when shifted to the third state, the signal d
is one input of the AND circuit 24, so the set output from the memory circuit 2n passes through the OR circuit 25 and becomes another input of the AND circuit 24, so that the memory circuit 5 is set, and its output Relay 26 operates and its contact 26a is turned on. If any one of the relay devices is malfunctioning, the memory circuit 5 is set by the output of the OR circuit 25 and the relay 26 is operated, so that when the contact 26a is turned on, an inspection abnormality output of the relay device is generated. Can be done. FIG. 4B shows a time chart of the above operation. Note that the set output of the memory circuits 2a to 2n serves as one input of the AND circuits 27a to 27n.
The other input is provided from the OR circuit 28. Therefore, when the signals d and e are output, if any of the memory circuits 2a to 2n has not been reset, one of the indicator lights 4a to 4n lights up.
Therefore, from this, it is possible to know which relay device is abnormal.

For example, assume that the relay device 1n continues to operate even when the sequence timer 3 shifts from the second state to the third state. In this case, the memory circuit 2n is reset by the signal c from the AND circuit 10 in the second state, but the memory circuit 2n is reset by the signal c from the AND circuit 10;
In this state, an output is output from the AND circuit 9 in response to the signal d, and the memory circuit 2n is set again. Therefore, the relay 26 operates as in the case described above,
The indicator light 4n lights up. FIG. 4C shows a time chart of the above operation.

If the switch 11 is closed after confirming the abnormality, each of the memory circuits 2a to 2n, 5, 6, etc. will be reset, each indicator light will be turned off, and the inspection abnormality output will be terminated.

When the memory circuit 13 is in the non-inspection state, that is, the memory circuit 13 is in the reset state, when relays X and Y operate even though no input is applied, an operating signal VP is output from the corresponding relay device. This operation signal VP passes through an OR circuit 27 and becomes one input of an AND circuit 28. Since the reset output of the memory circuit 13 is given to the other input of the AND circuit 28, an output is output from the AND circuit 28 and the time limit circuit 29 is output.
given to. If the operating signal VP continues to be output even after the time limit set in the time limit circuit 29 has elapsed, the memory circuit 6 is set. This set output lights up the indicator lamp 30, and the relay 31 operates to close its contact 31a. This indicates an abnormality in the relay device and issues an alarm. Once the memory circuit 6 is set, the above-mentioned inspection of the relay device is automatically started.
This will be discussed later.

If automatic inspection is to be performed periodically, the automatic inspection switch 32 is closed. This causes the period check circuit 33 to operate and output a signal every time a set time (or number of days) elapses. This signal becomes one input of the AND circuit 34. The other input of the AND circuit 34 is applied via the contact 18. Therefore, if the disconnector is not in the closed state, an output is output from the AND circuit 34 and becomes an input to the OR circuit 12. The memory circuit 13 is set by the output from the OR circuit 12, and the above-mentioned inspection is started. However, if the disconnector is in the closed state, contact 1
8 is open, so no output is output from the AND circuit 34. That is, if the breaker is in the closed state, no inspection is performed even if a signal is output from the periodic inspection circuit 33.

The set output of the memory circuit 6 serves as one input of the AND circuit 35, and the other input is provided via the contact 18. Therefore, when the memory circuit 6 is set, if the shunter or disconnector is not in the closed state at that time, an output is output from the AND circuit 35, and the memory circuit 13 is similarly set and inspection is started. However, if the circuit breaker is in the closed state, the contact 18 is open and no output is output from the AND circuit 35. That is, if the breaker is in the closed state, no inspection is performed even if an abnormal condition occurs and the memory circuit 6 is set.

Once the memory circuit 13 has been set and inspection has started, if the breaker is turned on during the inspection, the contact 18 will be opened. Separately, a reset pulse generating circuit 36 is provided which receives the set output of the memory circuit 13 and a signal applied via the contact 18 as input. This is configured to provide a pulse when the signal applied via contact 18 is interrupted during the period in which the set output is applied. Therefore, if the contact 18 is opened during inspection, a pulse is output from the reset pulse generation circuit 36, which is sent to the memory circuit 1 via the OR circuit 15.
Reset 3. This causes the inspection in progress to be canceled.

Manual inspections can be performed regardless of the operation of the shears and disconnectors. That is, when the switch 37 for manual inspection is turned on, an input is given to the OR circuit 12 via this, the memory circuit 13 is set, and inspection is started. Note that even if the breaker is turned on during manual inspection, the reset pulse generation circuit 36 will not generate a pulse, so the memory circuit 13
is never reset. The inspection will therefore continue.

Inspection circuit shown in Figure 1, especially sequence timer 3
A memory circuit 23 is provided to detect when there is an abnormality. As described above, the memory circuit 23 is set when the sequence timer 3 is activated and shifted to the first state. Then, when it is shifted to the fourth state and the signal e is output, it is reset by this. If the sequence timer 3 were not shifted to the fourth state due to some failure, the memory circuit 23 would not be reset. Since this set output is given to the time limit circuit 38,
If the reset is not performed even after the set time limit has elapsed, an output is output from the time limit circuit 38 and the memory circuit 39 is set. This set output turns on the indicator light 40, operates the relay 41, and closes the contact 41a. This indicates an abnormality in the inspection circuit and issues an alarm.

As described in detail above, according to the present invention, when inspecting a plurality of relay devices, the disconnector inserted in the electrical equipment (including the system line) that the relay device is protecting is detected. Since the inspection is stopped when the relay device is turned on, the protection of the electrical equipment by each relay device is not affected in any way, and the effect is that there is no room for misjudgment in the inspection results. play.

[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. FIG. 4C is a time chart for explaining the operation of FIG. 1. 1a to 1n... Relay device, 2a to 2n... Memory circuit for operation determination, 13... Memory circuit for starting inspection, 17, 18... Contact that responds to opening/closing of external sheath, 20... Inspection A memory circuit that gives commands.

Claims (1)

[Claims] 1. A memory circuit that is set at the start of inspection of a plurality of relay devices, and a circuit that issues an inspection command to each of the relay devices based on the set output of the memory circuit.
A circuit that determines whether each relay device is normal or abnormal based on the operation signal from each relay device based on the inspection command, and a circuit that generates a pulse when an external sheath disconnection is applied during the inspection based on the inspection command. and a circuit for resetting the memory circuit so that the inspection in progress is stopped by a pre-pulse.