SU1159077A1 - Arcless commutation device - Google Patents

Abstract

1. A DEVICE FOR A CIRCULAR CIRCULATION, containing an electromagnetic relay with a memory and a controlled semiconductor key connected in parallel with the contacts of the electromagnetic relay with a memory that is visible. In order to simplify and increase reliability, a two-relay relay is used as an electromagnetic magnetic memory relay, with the control input of a two-stable relay connected to the control input of a controlled semiconductor switch. 2. The device according to clause I., of which is that a two-stable relay with two control inputs is used as the electromagnetic relay with memory, and an OR element is introduced, and the inputs of the two-stable relay are connected to the inputs of the element (LI OR The output of which is connected to the control input of the controlled semiconductor key.

Description

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FIG. 1 The invention relates to the field of electrical engineering, in particular to the switching of an electric circuit of both a constant and an alternating current. The purpose of the invention is to simplify and increase reliability. In Fig. 2, block diagrams of device variants for arc-free, 1F1utations containing two-sided relays, respectively, with one and two control inputs are shown; in fig. 3 is a circuit diagram of a device for arc-free switching of an electric circuit of direct current with two inputs. The device for arc-free commutation contains an electromagnetic two stable relay 1, contacts 2, controlled by a double phased relay 1, an emulator semiconductor switch 3, which, when removed from the control input of the control command, assumes a disabled state, an OR device for arc-free switching (FIG. .1) works as follows. Suppose that in the initial state the contacts 2 of the electromagnetic two-stable relay 1 are in the open state, i.e. Switched electrical circuit is open. When the control command of the device for arcless switching of the control command is turned on, the control command Lenin is simultaneously supplied to the control input of the two-stable relay 1 and the control input of the controlled semiconductor switch 3. Since the speed of the control semiconductor switch 3 is significantly higher than the speed of an electromagnetic two-relay relay 1, the controlled semiconductor switch 3 is turned on before the contacts 2 are closed, the cai4iM locks the electric circuit and simultaneously shunts Ontacts 2, which ensures the arcless closure of the contacts 2 and, consequently, the electrical circuit. After the contacts 2 are closed, the control command of the device is removed from the device input, while the controlled semiconductor switch 3, for which when switching the DC circuit, a transistor can be used, and when switching the AC circuit, the maximizer turns off, and the contacts 2 remain closed and hence the electrical circuit remains closed. To open the electrical circuit, a shutdown control command is given to the control input of the device, which, depending on the two-stable relay and controllable semiconductor key used, may be of the same polarity as the polarity of the control command to be turned on, or opposite. When this occurs, a control command is simultaneously sent to the control input of the two-stable relay 1 and the control input of the controlled semiconductor key 3. Since the speed of the controlled semiconductor key 3 is much higher than the speed of the electromagnetic two-stable relay 1, the controlled semiconductor key 3 is activated before the contacts start. 2, thereby shunting contacts 2 and providing arc-free opening of contacts 2. After opening the contacts 2, the control command from the device input is removed In this case, the controlled semiconductor switch 3 is switched off and the electric circuit is opened. Thus, the device for arc-less switching performs arc-free switching on and off of the electric circuit. The operation of devices for arc-free switching (Fig. 2, 3), each containing two control inputs for switching on and off, when giving control commands to the corresponding control inputs is similar to the operation of a device for arc-free switching.

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Claims (2)

1. DEVICE FOR ARC-FREE COMMUTATION, containing an electromagnetic relay with memory and a controlled semiconductor switch connected in parallel with the contacts of the electromagnetic relay with memory, characterized in that, in order to simplify and improve reliability, a bi-stable relay is used as an electromagnetic relay with memory, the input being control bi-stable relay is connected to the control input of a controlled semiconductor switch. 2. The device according to claim 1, wherein the electromagnetic relay with memory uses a bistable relay with two control inputs and an OR element is introduced, and the inputs of the bistable 5 relay are connected to the inputs of the OR element, the output of which is connected to the control input of a controlled semiconductor key. 8U <„> 1159077