DE2012780A1 - Control device for disconnectors - Google Patents

Description

Control device for disconnectors When controlling disconnectors In contrast to switch disconnectors or circuit breakers, the Speed of switch actuation. There are therefore disconnector drives in Applications in which it takes a relatively long time to switch the disconnector (e.g. 10 sec.) Is required.

In these cases you want to avoid the command to switch of the circuit breaker must be given until the circuit breaker has its other End position reached.

This problem can be solved in a simple way by using the Disconnect switch drive can be switched on by a relay contact and for this relay provides a self-holding circuit that is closed until the other Switch position of the disconnector is reached. Such an arrangement would have the disadvantage that if the circuit breaker malfunctions, the control command is practical would be waiting for an unspecified amount of time.

One way of eliminating this disadvantage is to that a timer is provided that opens the self-holding circuit of the control relay, as soon as a time has elapsed, in which the isolating switch is normally its other Should have reached the end position. For disconnectors that are used before the end of a switching operation are reversible, a time would have to be selected for such a time element sufficient to be able to switch the disconnector twice with certainty. During these times, however, it is not possible to operate other switches, see above that after an attempted activation of the disconnector within a switchgear, which, for example, do not result in an actuation because the interlocking conditions are not fulfilled of the isolating switch is not possible, immediately afterwards the unlocking function carry out the necessary switching operations of the disconnector concerned.

In the case of a control device for disconnectors according to the preamble of claim 1 is now by applying v) r1 facilities according to the identifier one or more of the claims solved the problem of controlling a Disconnector on the one hand with a very short command pulse and on the other hand the stored command in the event of a switching operation not being carried out in an opposite the switch time to clear the disconnector for a very short time.

An exemplary embodiment is shown in FIG. 1 and a further exemplary embodiment is shown in Figs. Fig. 2 shows an example of the control the disconnector drive.

In the embodiment of FIG. 1 are used as a memory for control two control relays R and 4 are provided for the disconnector drive. That serves Control relay RE for switching on and the control relay RA for switching off one In Fig. 2 with armature ″ r and field F shown drive motor, which is not shown in Way operated the circuit breaker. Between the positive potential P and the negative The armature M and the field F of the drive motor are potential N of an auxiliary voltage source in series with three contacts rel, re2, re3 or ral1 ra? and ra3. at the beginning Contacts marked with the letters re belong to the control relay RE for the Din circuit and the contacts labeled ra to the control relay 2A for switching off the disconnector, not shown. From Fig. 2 that the armature M of the drive motor for the disconnector changes its direction of rotation, 3e according to whether the mlt re marked contacts or those marked ra are switched on are.

In Fig. 1, the control relay RE for switching on is in series to two contacts rel and re2 of a power button and in series to a signal contact MKA, which has a twisted contact piece, so that it is both in the off position as well as in each intermediate position of the isolating switch is closed.

This MKA signaling contact is mechanically connected to the isolating switch. In a corresponding way, the control relay 9A for the disconnection is in series to two contacts TA1 and TA2 of an off button and in series to a delde contact MKE, the also provided with an extended contact piece is so that it is closed in any position of the circuit breaker in the off position is. A contact re5 of the control relay is located parallel to the contact TE1 of the switch-on button RE in series with a contact el of a timing relay Z, which becomes a signaling contact MKS is connected in parallel. The MKS signaling contact is in every intermediate position of the disconnector closed except in the on position and in the off position. For example, can such a signaling switch contact for displaying the fault position through the series connection one only in the on position and one only open in the off position will be realized. To complete the self-holding circuit for the control relay RE, a contact re6 of the control relay is connected in parallel to contact TE2. In In the same way, the control relay RA is used for opening in series with contacts ra5 and ra6 of the same relay and to the specified parallel connection from the Contact zl and the signaling contact MKS switched.

The timing relay Z is between positive potential P and negative Potential N switched so that when one of the control relays RE or RA responds and remains addressed for the set time. To that end is a winding of the timing relay Z connected in series to the parallel circuit two contacts re4 and ra4 of the control relays RE and RA, while the second winding of the timing relay Z constantly between positive potential P and negative potential N lies. The timing relay Z can also be omitted if on a special one short activation of the on or off button is not important.

The disconnector is in the position of the signaling contacts shown switched off because the signal contact MKAY closed and the signal contact XREV open is. If the isolating switch is now to be closed, the contacts are first TE1 and TE2 of the switch-on button pressed. As a result, the control relay RE picks up and closes its contacts rel, re2 and re3 in Fig. 2. The drive motor becomes the isolating switch move towards the hold position. In practice, in the circuits Locking contacts for switches to be on. this is not shown here for the sake of simplicity; they prevent tarnishing of the drive motor if the locking conditions are not met. Simultaneously when the ON button is pressed and the control relay RE responds, it closes also the contact re4, so that the timing relay Z responds and its contact z1 closes. Aleo is created immediately after pressing the on button Self-holding circuit between positive potential P, contact z1 and the contacts re5 and re6. The time of the timing relay Z is now set so that when fulfilled Interlocking conditions of the relevant isolating switch to be operated by the drive motor can leave its off position. Only then does contact z1 open. In the case of missing Time relay Z, the switch-on button must remain pressed until this point in time. the The required actuation time for the power button is then still far below the switching time of the disconnector.

So if for any reason - e.g. because of certain interlocking conditions are not fulfilled or because the contacts of the disconnector are stuck - the disconnector his off switching position does not leave, so the self-holding circuit of the Control relay RE interrupted current flowing again and the control relay RE is fall off. During this time, however, the disconnector has already been in its switch-off position left, eo the MKS signaling contact is closed and the self-holding circuits eo remains in effect for a long time via contacts re5 and re6 until the disconnector is closed Has reached the switch-on position.

At this moment the signal contact MKA and the control relay open RE falls off. The mode of action when the switch-off button is pressed with the contacts TA 1 and TA 2 correspond to those when switching on.

If you do not use a control relay with a self-holding trela as a control store, but an electronic memory, so would have to be used instead of the self-holding circuit a signal can be applied to a blocking input of the memory used, the prevents the memory from being erased. When using a tax rate with two stable positions a signaling contact would be provided in the reset circuit of the relay, which prevents resetting as long as the disconnector is in an intermediate position is located.

For disconnector control devices that also have memory, relays or have transistors for position reporting, there is one for locking tasks more advantageous mode of operation of the new control device if corresponding to the exemplary embodiment in Figs. 3 and 4 is proceeded. In Fig. 4, like items correspond to the same Reference numerals as in Fig. 1. The circuit is essentially the same constructed and differs from that of Fig. 1 only in that instead of the parallel connection of the contact z1 with the signaling contact MKS the series connection of two contacts sel and sal lies. These contacts belong to position signaling relays SE and SA shown in FIG. They are in series with signaling contacts MKA1 and MKj1 of the isolating switch, which in turn, in contrast to the signaling contacts MKA and MKE in Figs. 1 and 4 do not have any elongated contact pieces and so are open in the intermediate position of the disconnector. That in a known way connected mechanical position indicator SM shows when the signaling contacts are open Mi1 and MKA1 the fault position of the disconnector. The position indicator relay SA for the off position of the isolating switch is in series with the signaling contact MKA1 and the position signaling relay SE for the on position of the disconnector is in series with the signaling contact MKE1 switched. In series with both relays there is a contact z2 of the timing relay Z. Zur Power supply, the potentials P and N are available again.

The mode of operation when the disconnector is actuated for the on or off Switching off corresponds to the mode of operation of the circuit according to FIG. 1. In the difference for this purpose, however, a self-holding circuit only comes into being when both position signaling relays SE and SA have dropped out, so that the associated contacts sel and se2 the self-holding circuit via which clock re3 or contact ra3 can close.

An Ode-r link if there is a timing relay Z in the self-holding circuit is laid here in the circuit of the position signaling relay. It is realized through the series connection of the contact z2 of the timing relay Z with the position indicator relay SE and SA. This contact z2 of the timing relay Z is always open when the timing relay Z has responded and its set time has not yet expired. Through this the position indicator relays SE and SA are always de-energized when either the Corresponding signaling switch contact MKE1 or MKA1 open or the one in series with them Relay switched contact z2 of the timing relay Z is open. One also takes here again that the circuit breaker is in the off position and switched on is to be activated, the switch-on button is activated after the contacts TE1 and TE2 have been actuated pull in the control relay RE, close its contact re4 and lift the timing relay Z open contact z2. This causes both SE and SA position signaling relays to drop out and close the self-holding circuit for the time set in the timing relay Z. After this time, the timing relay Z returns to its original position and closes his contact z2. The time is again measured so that the circuit breaker at normal switching sequence should have reached its fault position. In this case are Both signaling switch contacts MKE 1 and MKA1 open and the self-holding circuit 4 remains when the contact z2 closes. However, as a result of any Cause the disconnector has not yet left its previously assumed end position, one of the signaling switch contacts MKE1 or MKA1 will still be closed Corresponding position signaling relay SE ederSA back to the contact person and so on interrupt the self-holding circuit silver the contact sel or sal again.

The mode of operation is therefore the same as in the exemplary embodiment according to Fig. 1, by shifting the OR link in the circuit of the position signaling relay if a time relay is used, the position signaling relay is already adopt the switch position corresponding to the fault position of the disconnector, eo-soon an operation is initiated.

Since the contacts of these position signaling relays SE and SA are in the locking current circuits other circuit breakers are included, an interlock will be provided for those other circuit breakers already effected when actuation is attempted. You get an increase like that the security against misalignments that are otherwise almost simultaneous due to simultaneous gels Betcatigung two mutually ver @@@ valid disconnectors could occur One special circuit to prevent multiple switches from being operated twice thus superfluous. The remaining contacts of the relays for controlling the disconnector drive in the circuit of Fig. 4 can be connected in the same way as this is shown in FIG.

A circuit comparable to FIG. 4 in terms of its operation would be given when only the contact between the contact re5 and positive potential P. sel and between the contact ra5 and the positive potential P, the contact sa1 is switched on were. In this case the contact se1 would do together with the control relay in series RE switched signaling contact MKA also form a circuit that is only in the Fault position of the disconnector or when contact z2 of the timing relay Z is open closed is.

Claims (3)

Patent claims: 1.) Control device for a circuit breaker with a drive device, which is dependent on memories that can be set by supply pulses, characterized in that that in the 'ückstell- or self-holding circuit of the control of a circuit breaker causing memory (control relay lil, RA) on when the fault position of the Disconnector effective element (signaling contact MKS) is switched on, which is the reset prevented as long as the disconnector is in an intermediate position (fault position) is located. 2.) Control device according to claim 1, characterized in that into the self-holding circuit that controls a circuit breaker Memory (control relay RE,) with OR link a timer (contact z1) and the element effective when the fault position is reached (MKS signaling contact) is switched on and that the timer (Z) is set to a time which is at least as great is like the time it takes for the disconnector to leave the end position. 3.) Control unit according to claim 2 with position signaling relay that are in control of the switch position of the disconnector, thereby characterized that the position signaling relay (SE, SA) with OR link both are dependent on the position of the disconnector and on a command given excited timing element (timing relay Z) that controls the position signaling relay until its timeout into the switch position corresponding to the fault position of the disconnector (closing of contact z2), and that in the reset or self-holding circuits the <eichler (control relay RE, RA) for controlling the disconnector drive contacts of the position signaling relay are turned on so that the reset or latching circuit of the memory to control the disconnector drive (armature, eld P) then in the sense of a reset is ineffective if the position indicator relay is in the fault position of the disconnector corresponding switch position FtPhen.