JPS58131618A - Switch unit - 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 The present invention relates to a switch device for opening and closing an electric circuit. The contacts of an electronic switch acting as a switch and another electromagnetically controlled auxiliary switching (switch) are connected in series, and furthermore a central switch is connected to the electronic switch before each change state of the switching state of the electromagnetically controlled lid switchgear mentioned above. The present invention relates to a switching device which is provided with a control device, which subsequently switches the switchgear back into the terminal and closes the contacts of the auxiliary switch and the gear connected in series with the electronic switch.

Switching devices of this type are known and are shown, for example, in US Pat. No. 4,251,845 K11il.

This known switching device is selected via a series of auxiliary relays.

The switching order is predetermined by contacts inserted in the selection circuit. Here, this selection operation is also influenced by the auxiliary contact K of the electromagnetically controlled switchgear, which is provided in one power supply circuit separately from the switch-on or switch-off command. During the rainy period, K becomes more likely to encourage further progression of the switching order.

A disadvantage of this known switching device is that the electronic switch must have a relatively long switch-on time. The reason for this is that there is a permissible value for the release time of the auxiliary relay. As a result, this electronic switch has to absorb a corresponding amount of power loss and has to be typed accordingly. Furthermore, in known circuits of this type, when the power supply circuit is opened, the switching order depends on the release delay time caused by the capacitor connected in parallel with the coil of the auxiliary relay. Therefore, during operation, due to changes in the capacitance of these capacitors, a failure in the switching operation occurs, which has the drawback of particularly leading to destruction of the electronic circuit.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a switching device that can avoid erroneous selection operations of three switching elements.

This can be achieved according to the invention due to the following facts. That is, a central control unit is provided, independent selection circuits are provided for each of the Chinda elements in this unit, and test loops connected to the sensors are provided in these selection circuits. This can be realized by monitoring the switching states and/or selection operations of the switching elements and by linking these loops with each other according to instructions transmitted from a central control unit.

Therefore, as soon as the preceding rounding switching instruction occurs, the next switching order can be followed. However, this makes it possible to proceed with safety intervals between the individual switching steps, as required in known cases.

As a result, safety is increased and, furthermore, a reduction in the switch-on time of the electronic switch can be achieved.

Additionally, in order to monitor the position of the contacts of the electromagnetically controlled switchgear in the power supply circuit, auxiliary contacts are provided so that the switching sequence continues only when the contacts in the power supply circuit are actually closed. It is characterized by nine things.

Further according to the invention, the switching state of the electronic switch is monitored by a sensor operating in response to its control current, and the selection of the electronic circuit is linked by the selection of the auxiliary switchgear of the electromagnetic control lid:1. Furthermore, it is provided that a signal is triggered at the end of selection of the electronic switchgear and that this signal triggers a command for opening the contacts of the auxiliary switchgear via a delay element. Features.

For this reason, conventionally, for example, US Patent Specification No. 4,
Unlike the solution known in No. 251,845,
The electronic switch can be isolated from the power circuit at the power source. By this method, the electronic switch can be sufficiently protected against surges, short circuits, etc. on the load side.

As a result, the contacts can be kept open. The reason for this is due to the magnitude of the current in the short-circuit region of the current path created by the contacts and, under these circumstances, a high induced voltage is generated, along with extinguishing the formed arc.

The present invention will be described in detail below with reference to the drawings.

First of all, in FIG. 1, a magnetically, for example electromagnetically controlled, switchgear 1.1' has contacts 4 arranged in the power supply circuit, by means of which the power supply terminals L1. L2. Controls the connection from L3 to load 5. A series connection contact 6, 6' is connected in parallel with each of these contacts 4, 4', and these contacts 6, 6' act as an isolator. These contacts 6°6' belong to the auxiliary switchgear x, z'yc, with which the electronic switch S is connected in series.

According to FIGS. 2 and 3, switch ear 1 e x
-' is large for auxiliary switch gear 2.2'.

Ninth auxiliary contacts 2, 7' and 8 to monitor the function
．． 8/ are respectively provided and connect these contacts 7 + 7'rs, s' to the central control unit 9, as well as the switch ears 1.1', the auxiliary switchgear 2.2' and the electronic switch 3.

This central control unit 9 is connected from the power supply to the L1 phase and 2 phase.
- Wire KL and the conventional on/off switches 10, 10' and 11, respectively, for supplying power via the tral conductor. Similarly, the failure notification device 12 is connected to the central control device JjK.
Connecting.

According to the embodiment of FIG. 1, current transformers 13, 14 are provided by means of which the switching and switching functions of the switchgear 1 or auxiliary switchgear 2 and the electronic switch 3 are monitored. 9. A current transformer can be provided for each phase for more precise monitoring. In the switch devices shown in FIGS. 9, after passing the test loop,
The selection circuit for the auxiliary switchgear 2 is activated and its contacts close. When the return signal arrives via the closing of the contact 6 by means of the auxiliary contact 8, the selection circuit of the electronic switch 3 is actuated and this circuit is turned to be connected. By this method, the load 5 is connected to the power supply L1. L2゜Ljl' (K to be connected
Become. After this, the electromagnetically controlled selection circuit of the switch ear 1 is activated, so that its contacts 4 are closed.

After the return signal arrives at auxiliary contact 7 through the closed circuit of contact 4 of switch ear 1 by means of current transformer 13, electronic switch 3 is pulled and then auxiliary switchgear 2
The selection circuit is reset again and the contacts 6 of the auxiliary switchgear 2 are opened again. Of course, instead of monitoring only the - phase, all three phases could be monitored by transformer 74.

If ON is connected before tongue 10 and OFF presses tongue 11, OFF is triggered by pressing the tongue. Since the switching-off command has priority over the switching-on command, the selection of auxiliary switchgear 2 is performed. As the circuit operates, the contact σ closes.

After the return signal has been transmitted via the closing of the contact 6, but at the latest after a certain time has elapsed, the selection circuit of the electronic switch 3 is activated, so that this switch 3 becomes conductive.

As soon as a return signal corresponding to the built-through connection of the electronic switch 3 arrives, but at the latest after a certain time has elapsed, the selection circuit of one switch gear 1 is reset and the contact 4 is opened.

When this happens, the selection circuit of the electronic switch 3 is reset, and the selection circuit of the electronic switch 3 is reset at the latest after a certain period of time has elapsed.

After the selection circuit of this electronic switch 3 is completed,
The selection circuit of the auxiliary switch ear 2 is set so that its contacts 6 are opened and the switching off cycle is completed.

In the embodiment shown in FIG. 3, switching-on and switching-off cycles are performed in the same way. In this ζ,
Depending on whether the on button 1o or 10' is pressed, the auxiliary switchgear 2 or 2' is connected to contacts 6t or 6' and 4 as the next order of switchgear 1 or 1'.
K will close and select t or 4'.

h) and before the suitable selection of the auxiliary switchgears 2 and 2', a test is carried out in a test circuit, which ensures that the switchgear 1.1' and the auxiliary switchgear 2,2'
None of the coils of ' are energized and any of the contacts 4, 4' and 6.6' are closed and tested to see if they are 9.

Before switching, the selection circuits of the auxiliary switch gears 2, 2' and the switches 1, 1' are mutually communicated, so that when a switch-on signal arrives, for example, at the selection circuit of the auxiliary switch gear 2, the switch 4. A blocking signal is sent to the selection circuit of the auxiliary switchear 2' and the switchgear 1'.

These switchgears can therefore be activated after a switch-off command and a subsequent switch-on command, which is triggered by pressing the tongue 10.

If the electronic switch 3 is connected in parallel to the load side of the auxiliary switchgear 2, 2', a single electronic switch 3 can therefore be operated in both circuits in parallel with the contacts 4, 4' of the switchgear 111'.

A block diagram of a central control unit 9 for a switching device according to FIG. 1 or 2 is shown in FIG. 4, however:
Voltage supply is omitted.

Gettan on and off during central control unit 10.11
9 instructions are stored in memory 15. The output terminal of this memory 15 is selected by the circuit 1g, 11.111
and each of these selection circuits is assigned to one of the switching elements of the switch ear. In particular, the auxiliary switch ear 21 electronic switch 3 and switch gear IK are assigned. Furthermore, the output terminal of the memory 15 is also connected to the test circuit 19.

This test circuit 19 is connected to a sensor 20 which is responsive to the current flowing through the coil of the electromagnetically controlled switchgear 1. The sensor 20 also monitors the position of the contact 4 of the switchgear 1, for example, the position of the auxiliary contact 1.
or monitoring the switching state of the electronic switch 3 by sensors 7.13 and 21 connected to the current transformer 13 and, for example, the voltage supply to the ignition electrode of the electronic switch 30 and/or the current flowing through the parallel circuit. It is a response to This test circuit 19 also receives signals from a sensor 22 depending on the current passing through the coil of the auxiliary switchgear 2 and from a sensor 23 monitoring the switch state of one contact 6.

When a switch-on command arrives at the test circuit 19, the switch command is transmitted from this circuit 19 to the auxiliary switchgear 2.
is sent to the selection circuit 16 of. If the current flowing through the coil of the switch ear 1 or the auxiliary switch ear 2 is zero, these contacts 4t or 6 are in the open position and the electronic switch 3 is also in the blocking state.

When this is not the case, the switch-on command to the selection circuit 16 of the auxiliary switch ear 2 is interrupted, and a signal for the failure warning circuit 24 is transmitted.

This switch-on command to the selection circuit 16 is simultaneously sent to a resettable timing element 25, which
is connected to the reset input terminal of the selection circuit 16, and 1
．． As a result, after the end of the operating time, the selection circuit 16
A signal is sent to the reset input terminal of , which causes it to reset again. At the same time, this signal also activates a fault warning circuit 24, by means of which circuit 12, for example, is controlled.

However, the operation of the timing element 25 connected to the sensor 23 monitoring the contacts 6 of the auxiliary switchgear 2 is interrupted in the following cases: That is, this is a case where the closing of the contact point 6 is announced during the operation time of the tying bare hand 25.

As soon as the closing of the contact 6 of the auxiliary switchgear 2 is signaled to the selection circuit 16 connected to the sensor 23, this selection circuit sends a switch-on command to the selection circuit 11 controlling the electronic switch 3. This switch-off command can be delayed via the timing element 26 to prevent a through connection of the electronic switch 3 during burnout of the contacts 6.

When the switch-on command arrives from the selection circuit 16 to the nine selection circuit 17 connected to the sensors 7.13.21 and 23, it tests whether the contact 4 is still open, but whether the contact 6 is closed. . In such a case, the electronic switch 30 control electrode will receive a firing pulse or continuous signal, thus maintaining the through connection. If the above-mentioned conditions are not met, the control electrode of the electronic switch 3 will not receive anything and the fault warning circuit 24 will be activated. At the same time, a command is given to the selection circuit 16 of the auxiliary switchgear 2 to open the contact 6.

If a signal arrives at the control electrode of the electronic switch S within a specific time after the switch-on signal arrives in the selection circuit 11, or if no current flows in the parallel circuit, a failure warning is issued. When the circuit 24 is activated, the contact 6
A command for opening is transmitted to the selection circuit 16, and this state is monitored by the sensor 2 connected to the selection circuit 17. In this case, the selection circuit 17 is reset.

On the other hand, when a signal corresponding to an appropriate through connection of the electronic switch 3 arrives from the sensor 21 and is dead, a switching signal is sent from the selection circuit 11 to the selection circuit 18.
This circuit 18 is assigned to the switch fdf and IK, and this switch 1 acts to prompt the closing of the contact 4 as a result of the switch-on signal from the memory 15.

At the same time, this signal is connected to the resettable timing element tr
K arrives, and its output terminal is connected to the reset input terminal of the selection circuit 18 and also to the failure warning circuit 24.

If a signal corresponding to the closed contact 4 of the switch 1 arrives at the timing element 21 during its operating time, this element 21 is reset and no longer transmits the reset signal to the selection circuit 18, and the failure occurs. Warning circuit 2
The sending of the signal that activates 4 also stops.

In the opposite case, the selection circuit 18 is reset and the fault warning circuit 24 is activated, and the timing element connected to the output terminal of the timing element 22 and also connected to the reset input terminal of the selection circuit 11 takes place. 28, the selection circuit 11 is reset, and as a result,
The electronic switch 3 becomes blocked (blocked state).

However, if a signal corresponding to the closed contact 4 arrives at the timing element 27 and the selection circuit 18 within the set time, the selection circuit 18 issues a command to the selection circuit 11 to block the electronic circuit 3. will be sent.

As soon as the return signal from the sensor 21 reaches the control circuit 11 via the electronic switch blocking state, - from this circuit 1r to the selection circuit 16 via the timing element 26 a retraction signal which opens the grounding 6 of the auxiliary switchgear 2 is activated. A signal is sent.

If this type of return signal arrives within a specific time, the fault warning circuit 24 is activated and a signal is sent to the selection circuit 16 to open one contact 6.

This selection circuit 16 supplies a command to open the contact 6 to the auxiliary switchgear 2 and checks whether a signal corresponding to one opened contact 6 has arrived from the sensor 23 within a specific time. If this fails, the selection circuit 16 causes the fault warning circuit 24 to
A signal is sent to activate the contact 6, but the rounded command to open the contact 6 is retained, and this is not reset or toppled.

When a switch-off command arrives at the central control unit by pressing the on-butane 11, this command is stored in the memory 15.
This memory 15 connects the test circuit 19 and the selection circuit J 6 , J' from its output terminal.
7 and 18 for the signals arriving again.

This test circuit J9 closes the contact 4 of the switchgear 1 to check whether the electronic switch 3 is blocked (
check whether it has been blocked. If such a condition does not occur within a specified time, the fault warning circuit 24 will be activated. However, in both cases, the command to close the contact 6 of the auxiliary switchgear 2 is transmitted to the selection circuit 16 and the reset input terminal connected to the timing element 25 is transferred to the memory 15.
It is deactivated by a switch-off signal coming from.

Furthermore, if a switch-off signal from the memory 15 is present, the transmission of a switch-on command to the selection circuit 11 is started after a certain time. This starting operation is performed regardless of whether or not it is dangerous to supply a signal corresponding to the closed contact 6 from the sensor 23 within a predetermined time.

However, if this type of signal does not arrive, the fault warning circuit 24 is activated after the timing element activation time.

The switch-off signal coming from memory 15 ensures that: That is, even if the signal corresponding to the closed contact 6 is the selected circuit lI! 116 , the selection circuit J7 ensures that the electronic switch 3 is in the through-connection state and sends a switching signal to the selection circuit 18. This circuit 18 controls the switchgear 1,
Contact 4 is made to open as a result of a switch-off signal coming from the memory.

When the sensors 1 and 13 are opened and a signal corresponding to the nine contacts 4 is supplied, the selection circuit 18 selects the electronic switch 3.
A signal for blocking this switch 3 is sent to the selection circuit 17 of.

However, if this signal does not appear, the timing element 21 is activated and the fault warning circuit is activated.
A signal for blocking arrives at the selection circuit 17 after the activation time of the timing element 28 .

As a result, the electronic switch 3 is blocked and, after a signal corresponding to the appropriate blocking state of the electronic switch 3 has arrived from the sensor 21, contacts 6 of the auxiliary switchgear 2 are opened after a predetermined time has elapsed. Select signal to open circuit 1
7 to the selection circuit 16, and in this latter case the fault warning circuit 24 appears to be activated.

This selection circuit 16 controls the auxiliary switchgear 2 for opening the contact 6, and also checks whether a signal corresponding to when the contact 6 is open has arrived from the sensor 23 within a specific time. It's happening. If this is not the case, a fault warning circuit 24, which can be configured, for example, by O1'l''-) is activated, but the control of the auxiliary switchgear 2 for opening the contacts 6 is maintained.

This ensures that the switch-off command is executed in all cases, even if a fault occurs during a switching operation.

In the block diagram of FIG. 5, a memory 15 with two input terminals is provided, which is interlocked in connection with the switch-on command, and with two on-buttons 10, J.
O'. However, these switches are arranged so that they are in the same switch state when a switch-off command arrives. Therefore, only one of the two output terminals K of the memory 15 can transmit a switch-on signal, which signal can be transmitted to one or both of the switch-on switches 10, 1
Regardless of whether 0' is pressed or not, it is held until the off-button 11 is pressed.

This test circuit 19 monitors the switchgear 1' and the auxiliary switchgear 2' as well as the sensors 10, 1, 22 and 23 which monitor the switchgear 1 and the auxiliary switchgear 2t or their contacts 4 and C. sensor j
O'17'$22' and 23' are further connected to a sensor 21 which monitors the electronic switch 3. Furthermore, OR this test circuit? '-t! Two output terminals of the memory 15 are also connected through the terminal 10. Switch-on command is 0Rr-to3
0 to the test circuit 19, this circuit confirms that no current is flowing in any of the coils of the switchgear 1 and 1' and the auxiliary switchgear 2 and 2', and that no current is flowing in any of the contacts 4 or 4' and 6 or 6. ' is not closed and whether the electronic switch 3 is also in the locked state. If these conditions are met, a switching command is sent by this test circuit 19 and this command is passed to the two selection circuits 16, 16'.
to one of the memory 150 via one of the two AND r-) forming a link with one of the two output terminals, and these circuits 1g, x6' are connected to the auxiliary switchgear 2.
and 2' respectively.

At the same time, the two selection circuits are interfaces.

will be removed. The reason is AND? −) j 1 , j
Each of the output terminals of j is connected to one selection circuit 16゜16
' and connect it to the set input terminal of OR dart 33.
．． This is because it is also connected to the reset input terminal of the other selection circuit 16, 16' via 34. The two input terminals are connected to the output terminals of the timing element 25, which are connected to the sensor 1 and vllllc which monitor the position of the contacts 6.6' of the auxiliary switchgear 2. It can be reset by a signal from one of the sensors. This signal corresponds to the closed position of these contacts.

According to the embodiment shown in FIG. 5, the switch-on, switch-on, and switch-on operations are basically performed in exactly the same manner as those shown in FIG. 4, and the failure warning circuit 24 also operates under the same conditions.

Similar to the test circuit 19, the selection circuit 1 of the electronic switch 3
7 is connected to the two output terminals of the memory 15 via OR+"-) 30.
4' (sensors 23 and 23 connected to sensors 1 and 1' that monitor the D position and that monitors the contact 6°6')
′ is also connected. Switch-on command is timing element 2
Coming from the selection circuit J 6 , 16' via 6,
The selection circuit 11 checks whether the contacts 4, 4' are still open and whether the contacts 6t or 6' (but not both contact groups 6 and 6') are closed, and then the electronic Since the switch 230 selects only the control electrode, the electronic switch becomes a through connection.

When a signal representing this state of the electronic switch arrives from the sensor 21 to the selection circuit JFK, this circuit 17 sends a switching signal which is sent to the output terminal of the memory 15! ! AND? with a connected second input terminal? −)
Two selection circuits 18 via one of J 5 and J 6
．． 18'. These circuits are distributed to switch gears 1 and 1', respectively. At the same time, a timing element 27 is started which can be reset by a signal corresponding to the closed contact 4t or 4'.

The output terminals of the AND gates ss and set are connected to the selection circuit 18
．． 18' set input terminal as well as OR gate st
Also connect to t and sv. These 0Rr-to stt, sv
has its output terminal connected to the reset input terminal of the selection circuit 18.degree. 18', and its second input terminal connected to the output terminal of the timing element 27.

As a result, the interlocking of the selection circuits 18, 18' is performed again.

As soon as the signals corresponding to the closed contacts 4 and 4' arrive at each of the selection circuits 18, 18' from the corresponding sensors 1, 1', a rounding command is sent from these circuits to the selection circuit 17 to block the electronic switch 3. Given.

A signal causing contacts 6 and 6' to open is sent to selection circuit 16.
16', but a further course of the switch-on cycle takes place as in the embodiment of FIG.

The same signal is supplied from the two output terminals of the memory 150, which means the switch-on signal, and the test circuit 19 tests whether the switchgear contacts 4 and 4' are closed and the electronic switch is blocked. Check to see if it will be done. In either case, the switching command is sent from the test circuit 19 to the two ANDr gates 39.
．． 40 and has its input terminal connected to the output terminal of 0Rr-so, and thus connects this terminal only in case of a switching-off command. ,these? -) Connect the third input terminal of 551°40 to Senna"Is
- and 1', it is not possible to connect only the above-mentioned input terminals of these gates, which are connected to the sensor 7 or 1', which K thereby supplies a signal corresponding to the closed contact 4 or 4'. Do it like this.

Until the switching signal is transmitted from the selection circuit 11 to one of the selection circuits 1g and III', the next course of the switching off cycle is equivalent to the cycle described in FIG. 4.

When a switching off command appears at the two output terminals of the memory 150, the switching signal is sent through an ANDf- gate 41, the inverting input terminal of which is connected to the output terminal of the OR gate 3o, and this rounding Can only be connected in case of switching off command. Which AND
? -) 41 is connected to the set input terminal of the selection circuit via an anti-coupling element 42, 43 such as a diode, so that as a result, the contact 4°4'C4j4
The nine switch combinations 1' and 1' are controlled by the result of the present switching-off command.

The further steps of these switching-off cycles are the same as described in connection with Figure 4.

[Brief explanation of the drawing]

Figures 1 and 2 are block diagrams showing an embodiment of the switching device of the present invention, Figure 3 is a block diagram of the same switch device when it is connected to/released from a load, Figure 4 is Figure 1 or the block diagram of the central control unit in Figure 2,
FIG. 5 is a professional diagram of the central control unit of FIG. 3. 1.1'...Electromagnetic control type switch gear, 2.2'...
・Auxiliary switch gear, 3...Electronic switch, 4°4'
, g, g'...Contact, 5...Load, 9...Central control unit, 10.11...On, off is tan,
12... Failure warning circuit, 15... Memory, 16-1
8... Selection circuit, 25-27... Timing element,
20-23...Sensor. Applicant's Representative Patent Attorney Takehiko Suzue Patent Chief Kazuo Wakasugi 1. 1G table/I 1. Agent, 1. Date of death for Yuzuki: February 22, 158

Claims (1)

[Claims] 1. Provided in a power supply circuit to be switched,
An electronic switch that acts as an isolator and is connected in series with each contact of the first magnetically controlled switchgear and a second magnetically controlled auxiliary switchgear are connected in parallel to each contact of the first magnetically controlled switchgear, and the 2. Contacts of the auxiliary switchgear connected in series with the electronic switch are provided, the control being connected to the electronic switch and then blocking again before the switching state of the switchgear 1 changes; In the switching device which opens and closes the electric circuit by closing the switch, an individual selection circuit CI6.16', 11.18.18'' is provided for each of the switching elements (1+1'+J T ! ' + !).
), these selection circuits control the switching states of the switching elements (1*1'+2+3') and the test circuits connected to sensors that monitor these selections. A switching device characterized in that it has a loop and links these circuits together depending on nine commands sent from said central control unit (51). 2. A patent claim characterized in that an auxiliary contact (re y') for monitoring the position of the contact of the magnetically controlled switchgear (J, J') provided in the power supply circuit is provided. The switch device according to item 1. 3. Switch device according to claim 1 or 2, characterized in that the switching state of the electronic switch (3) is monitored by a sensor responsive to its control current. 4. The selection of the electronic switch (3) is linked to the selection of the magnetically controlled auxiliary switchgear C2l j'), and the trailing edge of the control current of the switchgear causes the auxiliary switchgear (C2l j') to The switch device according to any one of claims 1 to 3, characterized in that the switch device triggers a command for opening the contact of (2).