SU868926A1 - Device for automatic switching-over users from one dc supply channel to another - Google Patents

Description

(54) AUTOMATIC SWITCHING FOR CONSUMERS FROM ONE DIRECT CURRENT POWER SUPPLY CHANNEL

I

The invention relates to electrical engineering and is intended to provide power supply to the responsible aircraft consumers from separate power channels with the possibility of automatically switching consumers from one power channel to another.

Devices with autonomous power supply channels are known, each of which has its own consumer, containing a power switching element installed between the consumers of the channels and intended to unite the consumers and power them from one channel when they exit from the next one. These devices are related to DC and AC power supply systems and also contain sensors for switching power supplies to the network, power supply control units, control units for switching elements, and have a similar structure in both power actuators and information elements {1.

Closest to the one proposed is a device for automatically switching to OTHER

The shsh consumers from one feed channel of the current to the other, containing voltage sensors and generators with the element and short circuit sensors, the outputs of which are connected to the control unit of the switching element 2.

The disadvantages of the known devices, which include, in addition to the sensors listed above, also current sensors of batteries with time delay for determining the integral discharge of the batteries, include low accuracy and speed in detecting this abnormal mode and ensuring that consumers are switched to another pigment channel.

15

The purpose of the invention is to increase speed, expanding the field of application of the device (regardless of the type of generators and switches used to connect the generators to the network) and increase reliability.

20

This goal is achieved by the fact that a device for automatically switching consumers from one DC power supply channel to another, containing voltage sensors and generators, i | 1 whose inputs are connected to the unit, switches the generator rotational speed, the OR element two elements AND and a time delay block, 1) with one input of the first element AND connected with a sensor, another input from the frequency of the generator, and one through the element OR with the generator voltage and short closures, The output of the first element AND is connected to one output of the second element AND, the other BXI of which is NOT connected to the current of the gett through the element through the generator unit, the output of the second time delay element, as well as the sensor elements of the element And the short circuits of the first and the same manage the switching element. The drawing shows the block. Of the proposed device. Each power channel consists of a generator 1, a contactor 2 and a battery; I have 4, each connected to the switching commutator from the power supply channels connected to one another with a block cell 5, the output of which is the control element 6 of the switching unit of the unit 6 connected to identical control units 7 work kau dogo from the feed channel. Each of the control units consists of a sensor, a sensor 9, a short circuit 8 through 1 terminal. generator voltages, which are And 11. OR 10 are connected to the first voltage. Another input of the element 11 is connected to the sensor. The output of the element 12 is the rotational frequency of the generator that 11 is connected to the first input of the second element And 13, the second input of which is connected to the sensor 15. Element NOT 14 from output 13 via an electric generator. The output of the element ment 16 of the time delay coi zen with the input of the sensor 8 of the element OR 17 of the block 6. You are NOT the .18 block also connected to the element 6, and the output of the element 11 is connected with it, and the input of the electronic work of the AND 19 block 6. When the generator is 1, the pi of both power channels each melts its consumer 4. 15 is the output of the sensors 9, 12; element 1.1 chie signals, so the output signal also exists. So, there is no signal at the output of element 14, then it is missing 16. Thus, at the output of the signal element both in the presence of input channels to element 19 and the absence of signals of elements 18 from the outputs of sensors 8 on the switch, 17 signals are absent and 5 is disabled. PitapA channels with one and one malfunction and the NIN disappears the output signal; ASH pulsations of sensors 9. and 15 (output signal 9 disappears when the datF1 voltage is high, and if the feeder breaks from 1 to 2, the output signal of sensor 15 disappears), or the output signals of both sensors 9 and 15 disappear when the protection 1 is activated and the generator 1 is excited. In such cases, either the output signals of elements 1 and 19 disappear, which leads to the appearance of a signal at the output of element 18 and the inclusion of element 5, or if there is an output signal from sensor 9 and no output signal from sensor 15, the output signal of element 14 appears, leads to the output signals on elements 13, 16 and 17, which also causes switching on element 5. When the generator rotates below a predetermined threshold level, when the generator is able to reliably power the consumer, the output signal of sensor 12 disappears, which leads to loss of output signals from elements 11 and 19, the appearance of the output signals of the cells 18 and 17 and the fast switching on of the cell 5, which reliably prevents the discharge of the battery 3. This happens even if the output signal i of the sensor 9 is present, if the contactor 2 does not open. At the outputs of the elements 13 and 16, the signals are missing. With a deep decrease in the rotational speed, the output signal of the sensor 15 is also absent. When the rotation frequency increases, the output signals of elements 11 and 19 appear, which leads to the disconnection of element 5. If koetktor 2 was open by this time, then there are two inputs of element 13 (signals and output signal of element 13 goes to element 16, however at the input of element 17 and, accordingly, to re-enable element 5, the command will not pass until it has completed the time delay of element 16, the duration of which is longer than the signal passing time from the moment the output signal of element 12 reaches the disconnecting element 5. So In this way, the generator is reliably switched on to the network of the generator 1 through & out of the shutter mode, even if its operating voltage is 1 level of the flpjrroro channel operating voltage. In the P {w short circuit network, sensor 8 gives a signal not only to the input of element 18 to prevent Another channel of power supply through the element 5 on the existing short circuit, but also to the input of element 10, since the output signal of dagpos 9 disappears when the short circuit occurs. In the short circuit, the signals from the sensor 8 in the element 19 will receive signals from the sensor 8 in element 19, that provides a reliable bot devices in transition.

Thus, the proposed device is characterized by switching speed at lowering the frequency of rotation of the generator of one of the channels, which prevents the battery from discharging 1x batteries; reliable switching on the generator to the network regardless of the level of its operating voltage) w after the generator drive leaves the autorotation mode, which makes it possible to use the device with any types of DC generators and their switches, i.e. expands the field of use of the device; reliably blocking the switching of the ampoules & 1s in the transient mode in case of a short circuit of the network of one of the power supplies.

Claims (2)

Invention Formula A device for automatically switching consumers from one DC power supply channel to another, comprising voltage and current sensors of generators with NO element and sensors, short-circuit, the outputs of which are connected to the control unit of the switching element, characterized in that, in order to increase beating, expanding the area of use, vanity and increasing reliability; a generator rotational speed sensor, an OR element, two elements And, and a time delay block, and voltage sensors for short locks kany coupled through an OR gate. with one input of the first element And, (with a fugue, the input of this element is connected to the sensor chao Goths of rotation of the generator, the output of the first element I is connected to one output of the second element I, the other input of which is NOT connected to the sensor t via the element (generator, the output of the second element I through the time delay block, and the outputs of the short circuit sensor and the first element I connected with inputs of the control unit of the switching element. Source information accepted during the examination 1. GV Vlasov. Design of aircraft power supply systems. Engineering, 1967, p. 303 and 298. 2. USSR author's certificate N 603054, cl. And 02 J 9/06, 1978.