DD144477A1 - CONTROL UNIT FOR MOTOR DRIVES - Google Patents

Abstract

The invention relates to the field of electrical engineering. The object and the object of providing a safe electrical control circuit for motor drives of e.g. Hochspannungsstrennern to create 'is achieved according to the invention by a specific circuit of components that are present anyway. In this case, a slow-switching contact is provided in series with a contactor contact of the respective switching device in the control current path of the switching device to be locked. In addition to each one of the two end contacts in the control circuit of the brake contactor is arranged. - Fig.1 (

Description

Berlin, May 29, 1979 So / Hr - TRO 4514

Inventor:

Woldmann, Gerd Dipl.-Ingo Boetzer, Günter

applicant:

VEB transformer factory: Karl Lijsbknecht

Patent department

116 Berlin-Oberschöneweide Wilhelminenhofstr. 83-85

21 37

Title of the invention:

Control circuit for motocrants

Field of application of the invention :

The invention can be applied in electrical engineering, in particular for the operation of disconnectors and earthing switches in substations.

-a - 213729

Characteristic of the known technical solutions:

The control circuits of electrical drives for earthing switch and disconnector must be designed so that a mutual lock, is possible. Only certain switch positions may be allowed. It is known to use snap-action switching mechanisms which are triggered when a device is actuated and already lock the coupled device via corresponding safety contacts shortly after the actuation of the drive. (Z ₆ B. DB-OS 2 4-39 837, DE-AS 1 515 563, Kl. "· H 01 H 3/30) c

According to the prior art, it is also known to arrange a Bndkontakt in the control circuit of the motor reversing contactors · A disadvantage of this arrangement is that in case of failure of this end contact no security for the shutdown of the drive nach.ausgeführter circuit is available ο

Object of the invention:

The object of the invention is to provide a control circuit for motor drives, which ensures a reliable locking and circuit for drives of ζ.B "earthing switch against disconnector" without the complex mechanics of a snap-action mechanism,

Explanation of the essence of the invention :

After the object of the invention is a. To design control circuit such that a reliable electrical actuation with existing components in the drive is sufficiently feasible and the lock already short

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1 3729

becomes effective after actuation of the drive.

According to the invention, this object is achieved in that for locking two control circuits against each other a slow-switching contact of the auxiliary switch in series with a contactor of the motor reversing contactor of the respective switching device in the control current path of the switching device to be sealed and that are arranged to increase the Funktionssicherhe it the device ever two end contacts , which are in series with one auxiliary contact each of the respective engine reversal protection. In this case, each one of the two end contacts is arranged with its auxiliary contact in the control circuit of the brake protection. The two end contacts are triggered shortly one after the other, the first opening end contact interrupts the control current path of the corresponding motor reversing contactor and the second end contact opens the control current path of the brake contactor ₀

The auxiliary contact and the contactor contact of a drive are each as breaker contacts in the control voltage supply to be locked second drive ο This series connection of the auxiliary contact and the contactor contact ensures that immediately after the electrical operation of a drive by opening the contactor no actuation of the locking second drive is more possible.

Execution Example1:

The invention will be explained in more detail below using an exemplary embodiment. In the associated

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Drawings show

Fig. 1 - the control circuit of a disconnector in the switching state "off", and

FIG. 2 shows the locking contacts in the driver drive, which lie z, B in the control voltage supply line of a grounding switch.

According to Figo 1, the disconnector is turned on by the operation of the button Gi- "on".

The motor reversing contactor Ai- ¹¹ receives a voltage and the contactor contacts ai (7 »8) / a ^ (5» 6) / ai (3 »4) / ai (10,9) / ai (2,1) / a / j (1 ^/ i, 12) and a / j _T (i4,13) tToer a * j (1 _t 2) receives the brake contactor Ao voltage «The motor M is switched to the mains and the motor brake via the contact ao (15,16) solved, at the same time the control circuit of the Srder by the opener a ^ fj (14-, 13) is interrupted »With the beginning of Trennerschaltvorganges close the end contacts E £ and E ^ and the switching of the with With the help of the auxiliary switch contact HI (i, 2), but also delayed with respect to a / | r [i ( ^/ l4-, 13), the control voltage line of the earth drive is again interrupted At the end of the shifting process the opening of the end contacts E ^ resp., E ^ is initiated, normally end contact Ej switches first, now the motor reversing contactor A ^ drops and the motor is released Mains disconnected By opening a ^ (1,2), the brake contactor A3 drops out, the motor circuit is interrupted again and at the same time a braking process is initiated. The contacts aij; (^ 3 »^^) and H ^ gO, 2) are relay contacts for the disconnector from the control circuit of the earthing switch s,...

Claims (1)

-β- 21 3729 invention claim Control circuit for motor drives with auxiliary switch, in particular for the operation of disconnectors or earthing switches, d ad urch characterized in that a slowly switching contact of the auxiliary switch in series with a contactor of the motor reversing protection of the respective switching device in the control current path of the switching device to be locked, and that arranged two end contacts are in series, each with an auxiliary contact of the respective motor reversing protection * Steuerschaltung .nach point 1, characterized in that one of the two end contacts is arranged with an auxiliary contact in the control circuit of the brake contactor " For this: 1 sheet of drawings η λ V L ι Λ Q / M ^ f-? \