SU82912A1 - Automatic switch for automatic substations of wire broadcasting radio centers - Google Patents

Description

The autorun unit kit (the UBA-1 unit at the central station and the UPBA1 unit of the VUO-500 equipment at the automatic substation of the wire broadcasting radio center) is designed to turn on and off the AC mains supplying the substation, as well as the audio frequency and monitor the operation of the automatic substation It turns off the equipment when there is no voltage in the AC network supplying the automatic substation, but it does not just allow the equipment to turn on when it appears in the AC network. To activate the substation equipment, it is necessary to start from the central station. And since the duty technician of the central station does not know when the alternating current supplying the substation is connected to the substation, he has to periodically turn on the substation. For this reason, the substation will always be switched on later after the appearance of the alternating current supply network in the substation supplying the substation. In addition, the equipment of the auto-start block does not allow the on-duty technician of the central station to determine for what reason the substation was shut down: due to the absence of voltage in the AC mains supplying the automatic substation, or due to an accident in the substation equipment. In the latter case, the M1 multiple powerings of the substation equipment from the central station will cause additional damage to the equipment.

In the described automatic switch for automatic substations of wire radio nodes, designed to work with the kit of the automatic start-up unit, these drawbacks are eliminated by the fact that, in order to receive the control voltage, a relay is turned on in the rectifier circuit of the automatic switch, which short-circuits a part of the resistance connected to switching on auto start blocks (UPBA-1 and UBA-1) by the central station.

No. 829-12. -2The drawing shows a schematic diagram of the auto-start blocks and UPBA-1 with an automatic switch connected to them:

The diagrams of the central station UBA-1 and the substation UPBA-1, VUO-500-A keep the digital designations accepted in the factory diagrams of this equipment. The automatic switch circuit contains the resistance of the output voltage divider /, predraggers 2, relay 3, the second resistance of the voltage divider 4, power transformer 5, lamp of the kenotron 6, shunt resistance 7, cuprox rectifier 8, series filter resistance 9, automatic switch 10 and capacitors 11 and 12.

The automatic switch is connected to the open circuit (at points a, b) of starting and shutting down the substation (medium circuit of the transition transformer of the communication line) in the UPBA-1 block.

When there is a voltage in the AC mains supplying the substation, then one resistance / is connected between the points a and b, which does not reflect on the normal operation of the circuit.

The automatic switch through fuses 2 is permanently connected to the AC mains supplying the substation. In the absence of voltage, in the AC mains supplying the substation, all circuits of the automatic switch will be de-energized. During this period, resistance 1 and resistance 4 are connected to points a-b. If at this time the duty technician of the central station turns on the auto-monitoring station, he will notice a decrease in the starting current compared to its total value. Having determined by the current magnitude that the automatic substation has switched on, he sets the switch 19 of the UBA-1 unit to the “work” position, i.e., grounded the midpoint circuit of the communication line, and connects the bell 62 with the switch 61 in parallel to the Lamp 16 “work.

With the occurrence of an alternating current supply voltage supplying the substation, and consequently, in the winding 1 of the transformer 5 of the automatic switch 1, the voltage from the filament of the /// transformer 5 is fed through the contacts of the relay 3 to the glow of the 6 kenotron rectifier lamp. After heating the cathodes of the lamp 6, a current appears in the circuit consisting of series-connected resistances Y and 4, winding / relay 3 with its shunting resistance 7, winding // of transformer 5.

The current rectified by the kenotron rectifier creates a voltage drop across the resistances of 1 w. 4 (i.e., at points a and b) triggers the relay 3. This relay, having triggered, closes the resistance 4, turns off the lamp of the lamp of the kenotron rectifier and turns on the chain of the cuprox rectifier 8, consisting of the cuprox column 9, winding / D relay 3 to part of the winding // transformer 5.

The direct current established in the cuprox rectifier circuit creates a current in the winding // relay 3 that coincides in direction with the current of the kenotron rectifier flowing through the winding / relay 3, as a result of which the attraction of the relay core increases. After switching off, the current in the cathode circuit of the lamp 6 ceases, but the measles of the relay 3 remains attracted due to the flow of the current of the cuprox rectifier in the winding // of this relay.

. Since the cathode of the lamp 6 does not cool immediately, a voltage drop is maintained on the resistance / for some time, which being connected to the external switching circuit of the UPSA-1 and UBA-1 blocks will cause the substation to turn on.

An external resistance circuit / passes from point a through the winding of the relay 39 (UPBA-G block), resistance 37 (block VUO-500-A), substation grounding device, grounding device of the UBA-1 central station, winding relay 15, switch contacts 19, resistance 13, ammeter 14, secondary winding of the transition transformer 17, resistance 21, wires of the communication line, primary winding of the transition transformer 20 (UPBA-1) to the resistance point b / on the circuit breaker.

Switching on the equipment of the substation with an automatic switch causes the ignition of the lamp 16 “operation using the relay 15 of the UBA-1 unit (installed at the central station) and activates bell 62. After receiving a signal about switching on the substation independently, the duty officer of the central control room makes a note in the log switching on the substation and the switch 61 connects the bell 62 in parallel to the lamia 18 "emergency.

Such automatic switching on of the station equipment will be carried out every time after switching off and then switching on the alternating current supplying the substation.

Automatic switch; may not turn on the auto-substation when the switch 19 of the UBA-1 unit is in the "off" position (the switch-on circuit in this case is broken), i.e., when the on-duty technician deliberately turns off the substation in case of a broken communication line or software The reason for the burn-out of the lamp 6 in the automatic switch.

Spontaneous switching on of a substation by an automatic switch is possible only if the duty technician forgot to put the switch 19 of the UBA-1 unit in the “off” position when grounding the line wires.

If an equipment crash occurred simultaneously with the switching off of the alternating current, the automatic switch can turn on the equipment for several seconds with the appearance of the supply current (after that the substation turns itself off) (due to the absence of reverse current from the VUO-500-A unit).

Switch 10 is required to turn off the automatic switch when it malfunctions, changing lamps or cleaning and adjusting the relay contacts.

Capacitor // and resistance 9 are the filter in the cuprox rectifier circuit. This filter serves to eliminate the vibration of the relay core under the influence of the variable component of the rectified current.

The capacitors 12 in the circuit of the kenotron rectifier together with the winding / relay 3 are the filter of the kenotron rectifier.

Resistance 7 shunts the winding / relay 3. By varying its value, the turn-on time of the automatic substation is regulated.

Subject invention

Automatic switch for auto stations of wire broadcasting radio centers, in which cuprox and kenotron rectifiers are used, powered by a transformer (alternating current feeding the substation, characterized in that, in order to obtain a control voltage, a relay is connected to the rectifier circuit which short-circuits a part of the resistance connected to the external switching circuit of the auto-start blocks {UPBA-1 and UBA-1) by the central station.

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