SU35918A1 - Device for multiple reverse switching the circuit breaker - Google Patents

Description

For repeated re-activation of circuit breakers after they have opened a protected electrical circuit, such as an event of overload or an accident, devices with constant-time relays are usually used, which are used to drive a rotary switch with cam discs. The present invention relates to such a device and consists in its constructive implementation, which allows, using only a constant time delay relay, to carry out, at the reverse turn-on, a switch of time extracts increasing in arithmetic progression.

The drawing shows a diagram of a device for tripping a switch three times.

Pins 20 and 2 / are installed on the shaft of the circuit breaker to control the device, the first of which closes when the switch is turned on, and the second only when it is turned off.

By means of both these contacts, the time relay winding / 7, one end of which is permanently connected to the positive pole of the electric source (375)

can be connected to the negative pole and, thus, the relay 77 can be activated. The purpose of the controlled switching on and off of the relay. The sequence with contacts 20 vi 21 includes the contacts of the cam discs 5 and, accordingly, 4 mentioned in the beginning of the description of the comm switch 72. In addition to these discs, there are three more cam discs 1, 2, 5 on the rotary axis of the switch; the contacts of the first one are connected in series with the main contacts b of the time relay 77, which serve to close the circuit of the tripping coil of the circuit breaker, the contacts of the second are included in the circuit shunting the short coil of the relay 77 at. open the contacts of the disk 7 and finally the contacts of the disk 5 | are included in the circuit of the signal device actuated in the last position of the commutator; mouth 72. The switch 72 is rotated by means of the ratchet wheel and the pawl from the moving core of the relay 77.

The number of teeth of the ratchet wheel is selected depending on the required combination of shutter speeds; B0o6aj, e p, where m are the members of the required OTCH. For example, in this case

with a triple repeated. - the inclusion of time delay can be selected:

for the first turn-on -8 seconds, for the second -16, and for the third -24, which corresponds to a ratio of 1: 2: 3. Obviously, in the echo case, the number of teeth xpanoBHka rio in the above formula will be 8 and, therefore, with each retraction of the core of the relay, the pivot axis of the switch 12 will rotate iVs turn. It should be noted that the setting of the time delay of the first connection is made by moving in the vertical direction the main contacts b of the relay //, turned on, as already indicated; directly into the circuit of the switching coil of the automaton through the contact 9. The closure of the main contacts 6, as well as the contacts 7 and 8, the purpose of which will be described below, is produced by the relay core.//, for which the latter is provided with fingers made of insulating material. To regulate the speed of movement of the core, it is associated with a system of gear wheels fitted with a wind.

To reduce the strength of the current flowing through the relay coil // When it is excited, the resistance / J is connected between the contacts of the cam discs 2 1L 4.

When the circuit breaker is on, the switch J2 is in the zero position, the motor corresponds to the open state of the cam discs /, 5 and 5 and the closed state of the contacts of discs 2 and 4, Winding relay 11, due to the fact that the contacts of the disc 3 are open and disconnected from the contact 20 and therefore, the relay // does not work. When ejecting an automatic machine, the contact 21 sitting on its shaft will close the relay circuit through auxiliary contacts // and this is the last, several retraction of its own | Card, through the contacts 7 will turn on its winding in the circuit of the current source

consistently with. resistance 13. Auxiliary contacts (5 at the same time

will be open. Thus, the application in the device of the resistance 13 and the auxiliary contacts 7 and 8 of the sub; em to set the core in motion

with a current of greater strength, and in the upper position of the current, to pull a force much lesser.

When it moves, the relay core // will turn switch 12 to the next position (contacts dikoav f, 3 4 are closed, and the contactors of disks 2 and 5 are open) and after the first exposure time (8, seconds) closes the circuit of the switching-on automatic coil in the main contacts 6 a relay // connected in series with the cam disk contacts / currently closed .. At the same time as switching on the switch, next, immediately after closing the switching coil, contact 21 is opened in the relay circuit // and the core of the latter drops down and the contacts b and 7 ivnovzam (Yka contacts 8.

If after that the switch is turned off again, the relay // will be turned on again via contacts 27 to 8 into the current source circuit, its core will re-enter and turn the switch to the down position (contacts of the disks, / and 5 are open, and contacts of the disks 2, t closed). In this position, due to the fact that the contacts of the disk / open, the closure (after 8 seconds) of the main contacts 6 will no longer activate the switching coil, but will only cause a bypass of the relay winding // through the contacts of the cam disk 2. As a result The sensor will fall down again, close the contacts 8 and turn on the relay coil through the contacts of the disk 4 closed at this moment into the circuit of the current source. Then the core will re-enter, turn the switch / 2 to the third position, similar to the first one, and after 8 seconds, contacts 6 will close the circuit including the automaton coils. Thus, the second switch-on of the machine will be made only after 6 seconds. If, after the second switch-on, the switch is thrown, the device will automatically make the third switch-on after 24 seconds, i.e. in the sixth position of the switch 72, which is similar to the first position. When moving to the fourth position, and then to the fifth position (both of these positions are completely analogous to the second), the core will only

shunt the winding of the relay 7 /, not making a circuit, including the coil circuit.

After the third failed turn-on, the switch goes to the seventh-last position (the contacts of the disks / and 4 are open, 2, 3, 5 are closed). At the same time, the cam disk contacts - / disconnect the relay coil from pin 21, and the contacts of disk 5 close the alarm circuit 1b ...

To return the switch / 2 after the first successful switching on to the initial (zero) position, contact 20 also fastened on the shaft of the automaton and connected to the relay // winding through the contacts of the disk 3 serves. Contact 20 is not connected to the main contacts 6, resulting in a relay circuit 7 / it will open immediately after treading, the core vanishes, and thus bringing the switch to its original position (by passing through all the remaining positions), in case of successful switch-off, will occur without artificially created time delay and. In the rest position, the relay circuit / 7 is interrupted by the contacts of the disk 3.

The release of the switch after the elimination of the causes of its triple fall occurs with a conventional bell button, with the help of which the contact is connected to the negative pole of the current source; after 8 seconds the switch goes to zero and the normal shutdown mode is restored. For a long shutdown, the line protected by the circuit breaker is a double pole / 7 switch; the left position of this switch corresponds to automatic and right hand control. With manual control, on and off are performed using the / 4, 75 button.

The subject matter of the invention.

Claims (3)

1. A device for repeatedly re-activating the circuit breaker after the latter opens the protected electrical circuit caused by an overload or accident, in which the device uses a constant time relay and is driven by a ratchet gear, a switch with cam discs, characterized by that, in order to use only a constant time relays alone to obtain a series of time prolonged in arithmetic progression, the rotary axes of the switch 72 are placed four cam contact disks 7, 2, 3, 4 which serve to control: a disk with 7 contacts in the circuit including a coil of the mentioned circuit breaker, a disk with 2 contacts in the circuit shunting the winding of the relay 77 when the contact positions are open disk 7, for which purpose the cams of the latter are displaced relative to the cams of disk 2, the disk by J-contacts in the control circuit, closed by the circuit breaker when it is turned on, and the disc by 4-contacts in the control circuit, which is closed by the same off ents at the switched off his position. 2. In the device according to claim 1, apply the resistance J3 connected between the contacts of the disk 4 and the contacts of the disk 2 and serving to reduce the current flowing through the winding of the relay 7 when the latter is energized. 3.When the device according to claims 1 and 2, there is an additional cam disk 5 in switch 72 that serves to close the signal circuit at the last position of switch 72. % 9 fO g 1