SU1206859A1 - A.c.switching device - Google Patents

Description

 one

And: • IG) retention is related to the threefolds of control, control, and control as a function of the load current and can be used in low-voltage electrical installations of alternating current,

The purpose of the invention is to increase the speed of the relay and to expand its operating possibilities.

FIG. I presents the circuit of the alternating current relay; FIG. 2 - time diagram of the relay.

The AC relay contains a reed switch 1, turned on at the input of the voltage driver 2, the output of which is connected to the integrating RC-link 3 connected to the input of the threshold element 4, the output of which is connected to the control relay 5. The contact group 6 of the control relay 5 is connected to the trigger trigger inputs 7, the one-shot 8 is connected to the voltage driver 2, and the turn-on trigger output 7 is connected to the response potentiometer 9 The release potentiometer IO is connected to a power source, the single-vibration output 8 and the movable potentiometer contacts 9 and 10 are connected to the anodes of the diodes 11-13, the cathodes of which are combined and connected to the control winding 14.

Relay AC operates as follows.

In the initial state of the relay (at maximum response sensitivity) the voltage on the control winding 14 is set at a higher level of release voltage of the reed switch 1. The installation is performed via diode 12 with the operation potentiometer 9, to which the voltage comes from the trigger output 7, now in a single state. Potentiometer 10 release, connected to the power source - after diode 13, the voltage is set at a level lower than the release voltage of the reed switch 1. Diode 12 is open, and diodes 11 and 13 are closed. The total magnetizing force of the reed switch 1 is formed by the interaction of the magnetizing force of the control winding 14 and magnetizing force through a controlled current wave. When the current in the controlled circuit is less than the relay operation current, the reed switch 1 is open.

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When the alternating current reaches the set value, it is triggered. Neither the reed switch 1 under the action of the total magnetizing force is closed along the first amplitude of the current.

The shaper 2, when the reed switch 1 is closed, causes a voltage front at the output, along which the one-shot 8 forms a pulse of a given duration, the greater the voltage of the reed switch 5. Diode II opens and diode 12 closes. The voltage pulse of the single-vibrator 8 is supplied through the diode L 1 to the control winding 4, which allows the closed state of the reed switch 1 to be maintained for a period of time less than an alternating current period and sufficient for a full charge of the integrating capacitor 3. when the output voltage of the integrating RC-3Berfa 3 reaches the switching-on voltage, the threshold element generates a matched voltage for the control relay 5. When the control relay 5 is turned on, its contact group 6 switches the switch-on trigger state 7 from one to zero. At the output of the trigger 7, the voltage changes to zero. Diodes 12 and 13 remain closed by the voltage on the cathode of diode 11. The voltage in the control winding 14 will only change after the end of the one-shot B pulse. In this case, the power supply voltage supplied from the release potentiometer 10 through the diode 13 is established in the control winding 14 which is less than the release voltage 1. Thus, the reed switch I under the action of the one-shot impulse 8 is in the on state not only at half- 4 (; the period of positive half-wave of alternating current, but also during the majority of the half-period of negative half-wave of current. Discharge of the integrating RC capacitor 3 when it is turned off reed switch 1- for a time that constitutes a smaller part of the half-cycle of alternating current, occurs to the level of a higher turn-off voltage of the threshold element 4. Therefore, the threshold element 4 retains its on state. Horn element 4 does not change and control relay 5

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stays on.

When the AC current decreases to the release value, the reed switch opens during the half period of the negative half-wave current. The AC relay is turned off when the capacitor of the integrating RC element is discharged to the off level of the threshold element 4. When the threshold element 4 is turned off, the control relay 5 is turned off.

The setting and regulation of the AC relay is made by potentiometers 9 and 10. To accurately set the relay at the lower limit of the response current, taking into account the sensitivity of the reed switches, the potentiometer 9 triggers the control winding 14 to a close, but greater release voltage of the reed switch 1, and the potentiometer 10, the release is set at a voltage close to, but less than, the release voltage of the reed switch 1.

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When adjusting the response current, the voltage at the sliding contacts of potentiometers 9 and 10 is reduced while maintaining the difference between them.

Since, within the control of the pickup, the voltage set by potentiometer 9 is always somewhat greater than the voltage set by potentiometer 10, the operation of the alternating current occurs on the approach to a predetermined value. This level of actual operation is close to the release level, which increases the return coefficient of the relay.

The maximum speed of the relay is ensured by tripping on the amplitude of the positive current half-wave at the tripping level.

The actuation current is controlled within a wide range, determined by the variation of the voltage across the 25 voltages in the control winding 14 from the release level of the reed switch 1 don.

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Claims (1)

AC switching device containing a magnetically controlled sealed contact, an MDS source in the form of a current-carrying bus, a voltage shaper, an integrating link including a capacitance and a resistor, a threshold element, a control relay and terminals for connecting a constant voltage source, and the voltage former input is connected to the terminals reed switch, and its output - to the input of the threshold element through an integrating chain, the control relay coil is connected to the output of the threshold element, characterized in that, in order to increase the speed of the relay and expand operational capabilities, a single-shot, a trigger, two potentiometers, three diodes and a magnetically controlled contact control winding are introduced into it, the cathodes of these three diodes are interconnected and connected to the magnetically controlled contact control winding, the anode of the first diode is connected with a movable contact of the first potentiometer, the terminals of which are connected to the terminals of a constant voltage source, the anode of the second diode is connected to <g is connected to the movable contact of another potential tra, one of the outputs of which is connected to the negative terminal of the DC voltage source, and the other terminal of the potentiometer is connected to the output of the trigger, the input of which is connected to the switching contact of the control relay, the anode of the third diode, connected to the output of the single-shot, the input of which is connected to the output of the voltage driver, ! 206859