SU1665423A1 - Synchronized reed relay - Google Patents

Abstract

The invention relates to electrical engineering, specifically to electrical relays on magnetically controlled contacts. The purpose of the invention is to increase the reliability of the relay. When the contact 13 is jammed, the electromagnet 14 and the permanent magnet 7 provide for the inclusion of the reed switches 3 and 4 in the current-free pauses. For example, when the polarity is positive, the reed switch 3 is first engaged. In this case, diode 1 prevents current from flowing in the reed switch 3. Next, when the polarity is changed, the reed switch 4 is engaged and the current flows through the reed switch 3. When the relay is turned off, the contacts of the reed switches 3 and 4 open in dead time, i.e. when the current is positive, first the contact of the reed switch 3 opens, in the circuit of which only the reverse current of diode 1 flows, then when the current polarity changes - the contacts of the reed switch 4. Synchronized current shutdown is provided only at a fixed angle between the current and the load voltage. 1 il.

Description

one

(21) 4641550/07

(22) 01/25/89

(46) 07.23.91. Bul №27

(75) V.V.Krivtsov and V.I.Gurevich

(53) 621.318.862-5 (088.8)

(56) USSR Author's Certificate No. 319005, cl. H 01 H 9/30, 1970.

USSR Author's Certificate Ns 1138849, cl. H 01 H 33/66, 1983. (54) SYNCHRONIZED WALL-MOUNTED RELAY

(57) The invention relates to electrical engineering, specifically to electrical relays on magnetically controlled contacts. The purpose of the invention is to increase the reliability of the relay. When the contact 13 is jammed, the electromagnet 14 and the permanent magnet 7 provide

the inclusion of reed switches 3 and 4 in the dead time. For example, when the polarity is positive, the reed switch 3 is first jammed. In this case, diode 1 prevents current from flowing in the reed switch circuit 3. Then, when the voltage is changed, the reed switch 4 is pressed and the current flows through the reed switch 3. When the relay is turned off, the reed switch contacts 3 and 4 open in currentless pauses, i.e. when the current is positive, first the contact of the reed switch 3 opens, in the circuit of which only the reverse current of diode 1 flows, then when the current polarity changes - the contacts of the reed switch 4. Synchronized current shutdown is provided only at a fixed angle between the current and the load voltage. 1 il.

The invention relates to electrical engineering, specifically to electric relays on magnetically controlled contacts, and can be used in control systems of high-voltage AC installations.

The aim of the invention is to increase the reliability of the relay.

The drawing shows a schematic diagram of the relay. h

The synchronized reed switch contains two high-voltage diodes 1.2, in series with each of which high-voltage reed switches 3.4 are connected, which are parallel to each other and have field windings 5.6. whose length does not exceed half the length of the reed switch balloon. The excitation windings 5.6 are placed on reed switches 3.4 so that they cover one of the pairs of parallel located contact details, and when receiving power each of the windings 5.6 magnetizes the contact detail covered by it with a pole opposite to the pole of another contact detail of the same a reed switch magnetized by a permanent magnet 7 facing the other pair of parallel-arranged contact parts by one of its poles. The excitation windings 5,6 are interconnected according to and in parallel, with one pair of their conclusions being connected to a common point directly, and the other through oppositely connected diodes 8.9 and connected to the resistor 10 of the voltage divider 11, which through the gerkotron {high-voltage reed switch) 12 is connected to the terminals of a high voltage AC power source. Excitation winding gerkotron 12 through button 13 (On) below

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connected to a low voltage DC power source. The core of the electromagnet 14 faces the protruding parts of the contact parts 3.4 of the opposite poles, and the winding of this electromagnet is connected to the resistor 15 of the voltage divider 16, which is connected via parallel connection to the high voltage AC power source through the gerkotron 17. The excitation winding of the gerkotron 17 through the button 18 is connected to a low-voltage source of direct current power.

The device works as follows. At short-term (but not less than 20 ms) pressing the button 13 (NCL), the excitation winding of the herkotron 12 is energized, as a result of which the latter closes its high-voltage contact, thereby connecting the voltage divider 11 to the high-voltage power source (at the same time 11 a current of 2 mA flows). A signal (voltage about 300 V), taken from resistor 10, at a positive voltage at the terminals of a high-voltage source, is fed to the excitation winding of the reed switch connected to the diode to which the reverse voltage is currently applied (the diode connected to the excitation winding will work in this direction). Thus, this reed switch closes without arcing, switching the reverse current of the diode. Similarly, when the voltage is changed at the terminals of the high-voltage source, another reed switch is triggered (the half-wave of the load current passes through the already closed contact parts and the first reed switch). When releasing the button 13, the voltage is removed from the windings 5.6, however, both reed switches remain closed due to the permanent magnet 7, and the magnetizing force created by them can only keep the reed switches 3.4 in the closed state (but not close them).

When the button 18 (Off) is briefly pressed, the divider 16 is connected through a reed switch 17 to a high-voltage power source. The signal removed from the resistor 15 is fed to the coil of the electromagnet 14, the latter being wound so that the pole of its core facing the contact details of the reed switch which currently conducts a reverse current of a diode connected in series with it, magnetizes it with a pole, the same contact with the pole of another contact-part of the same reed switch, which is acted upon by a permanent magnet. Similarly magnetized contact parts in the overlap zone open, At the next half-wave of the supply voltage, the contact details of another reed switch open. It should be noted that the magnetizing force created by the electromagnet can only open the contact details of these reed switches. Thus, the opening of the contacts of reed switches 3,4, as well as their closure, occurs synchronously in dead-time pauses.

0 Synchronized disconnection of the circuit is provided only at a constant angle between the current and the voltage on the load.

Improving the reliability of the device is achieved by eliminating the formation of

5 arc when closing contacts.

Claims (1)

Claims of the invention: A synchronized reed switch containing terminals for connecting the main and auxiliary power sources and terminals for connecting the load, four reed switches with coils, four diodes, four resistors and two control buttons, characterized in that a permanent magnet and an electromagnet with a core and a coil are inserted, with the cylinders of the first and second reed switches arranged parallel to each other, each coil of the first reed switch and coil of the second reed switch 0 made in the form of cylinders, the length of each of which does not exceed half the length of the cylinder of the corresponding reed switch, the cylinders of the first and second reed switches are installed inside the corresponding coils 5 so that said coils of the first and second reed switches cover the first contact details of the corresponding reed switches, the core of said electromagnet is located between the first contact details of the first and 0 of the second reed switch so that the axis of the core of the electromagnet is perpendicular to the axis of said reed switches, a permanent magnet is installed between the second contact details of the first and second reed switches so that one of Its 5 poles are located between the second contact-parts of the indicated reed switches, the first contact-parts of the first and second reed switches are connected to a common point, the second contact-detail of the first reed switch is connected 0 with the cathode of the first diode, and the second contact part of the second reed switch is connected to the anode of the second diode, the cathode of which is connected to the anode of the first diode, leads for connecting the main power source, leads for connecting the load, common connection point for the first contact parts of the first and second reed switches and common point of connection of the first and second diodes form a series circuit, the first output for connecting the main power source through the first resistor connected in series, the second resistor and the third reed switch connected to the second output for connecting the main power source, the first output of the main power supply through the serially connected third resistor, the fourth resistor and the fourth reed switch connected to the second output of the main power supply the first reed switch is connected to the cathode of the third diode, the anode of which is connected to the first output for connecting the main power source; the first output of the coil of the second reed switch connected to 0 the anode of the fourth diode, the cathode of which is connected to the first output for connecting the main power source, the second terminals of the first and second reed switches are connected to the connection point of the first and second resistors, the electromagnet coil is connected in parallel to the third resistor, the third reed switch coil is connected to the terminals for connecting the auxiliary power source, and the fourth reed switch coil through the second control button is connected to the terminals for connecting the auxiliary source Chnik nutrition.