SU1348936A1 - Indicator of asymmetry of power supply of three-phase users in agriculture - Google Patents

Abstract

The invention relates to electrical engineering and is intended for use in power supply systems of agricultural objects. The purpose of the invention is to increase the service life and simplify the localization of a faulty monitored network. In the case of full-phase power supply, the voltage at the output of the rectifier 4 is no more than 5% of the phase voltage of the network, and the sound alarm unit 2 and relay 7 do not operate. In the event of a network phase failure when the motor load is connected, the voltage at the output of the rectifier 4 is about 12% of the phase voltage, which leads to the operation of the sound alarm unit 2, while the relay 7 does not work. In the event of a phase failure when a resistive load is connected, the voltage at the output of rectifier 4 is about 50% of the phase, which triggers the operation of block 2 and relay 7, while the contact of relay 7 opens and a resistor 6 is introduced into the control input circuit of block 2. After receiving the signal for incomplete phase mode, by pressing switch 5 and monitoring the luminescence .1amp 12, a faulty mains phase is detected. 1 il. (L from 00 y from O5

Description

The invention relates to electrical engineering and is intended for use in power supply systems of agricultural objects.

The purpose of the invention is to increase the service life and simplify the localization of the faulty phase of the monitored network.

The drawing shows a schematic diagram of a public signaling device.

The power asymmetry detector of three-phase consumers in agricultural objects contains a capacitive asymmetry consisting of three capacitors 1, connected by a star, connected to the phases of the monitored network, an audible signaling unit 2, a light-signaling unit 3, a rectifier 4 and a three-phase switch. 5 switch The sound alarm unit 2 receives a signal from the bridge rectifier 4, the voltage from the output of which is fed to a jurv chain consisting of the control input of the fuse connected in series (for 2 sound signals of the first resistor 6, shunted by opening the contact of relay voltage 7 that controls the input connected to the output of connector 4, zero current (), and the palispia unit 3, consisting of three chains, is connected to the cohort -eleven. each of which contains an incandescent bulb 12 and a damping resistor 13 connected in series. Chains 9-11 11 (1dk, 1k) are given by the first terminals to the ny, left conductor 8, and watts (.) Are snooped through the switch 5 to

corresponding phases of the monitored network.

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At 11 () LPG) phase supply mode, the voltage at the output of rectifier 4 has a small amount, which is determined by the norm by its supply network symmetry and is not more than 5% of the phase voltage. Under such a voltage, block 2 of the audio system | -on; 1ization and relay 7 does not work.

In the event of a network phase failure when a motor load is connected, the voltage at the output of rectifier 4 is about 12% of the phase voltage of the network, which causes the unit 2 to beep, beep, while relay 7 does not work and the relay is shunted by contact 7

In the event of a network phase failure with an active load connected (electric lighting and heating devices), the voltage at the output of the sensor 4 is about 50% of ({different network voltage, which leads to the operation of unit 2

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an audible alarm and a voltage relay 7, whereby the contact of the relay 7 is opened and a resistor b is introduced into the control input circuit of the unit 2.

After receiving a sound signal about the non-polyphysic power supply mode, the duty personnel of the facility by pressing the switch 5 and controlling the luminescence of the lamps 12 determine the faulty phase of the network.

The operation of the detector when the break of two phases of the network is carried out similarly.

The positive effect of the invention is to increase the service life of the device, which is provided by inserting a resistor into the control input circuit of the audible alarm unit at the maximum voltage at the output of the rectifier and in simplifying the localization of the faulty phase of the monitored network after receiving a sound signal about the presence of a fault.

Claims (1)

Invention Formula Three-phase power asymmetry indicator in agricultural facilities, containing three capacitors connected in a star, connected to the phases of a controlled network, sound and light signaling units, a rectifier, the first input connected to the star neutral point, a switch, the first resistor and a relay eg the first terminal of the control input connected to the positive output of the rectifier, characterized in that, in order to increase the service life and simplify the localization of the faulty phase, the controller network, the rectifier is made full-wave and the second input is connected to the zero conductor of the controlled network, the second output of the control input of the voltage relay is connected to the negative terminal of the rectifier, between the positive and negative outputs of which is connected the first chain consisting of serially connected anvara of the sound alarm unit and the first resistor, shunted by the disconnecting contact of the voltage relay, the light signaling unit being made on the second, third and even back chains, each of which includes a series-connected incandescent lamp and a damping resistor, the first terminals of these chains are connected to the neutral conductor of the monitored network, and the switch is made pushing, and the second output of each chain of the light signaling unit is connected to the corresponding phase of the monitored network separate make contact of this switch.