SU1317557A1 - Device for blocking the reclosing for supplying power to faulted electrical installation - Google Patents

Abstract

The invention relates to the field of electrical engineering and is intended to protect service personnel from electric shock during asymmetric ground faults. The aim of the invention is to increase the reliability of blocking when working with a protection unit, the output of which is normally under voltage. When a ground fault occurs in the current transformer of the zero sequence, the current opens the transistor 3. The node consisting of transistors 4 and 5 forms a circuit in which the relay modes of saturation of transistor 4 and cut-offs of transistor 5 develop. Output unit 6 de-energizes and opens its contacts 20 and 21, the switching device II disconnects the power receiver from the mains. In this case, the device is turned on again by the button 23. The start-up becomes impossible, since the blocking relay 16 remains under voltage and its contact 17 breaks the power supply circuit of the switching device 11. In this case, the voltage supply to the receiver can be lost after the device returns to its initial position by pressing the button 22 “Stop. 1 il. (With the word oo ate

Description

The invention relates to electrical engineering and relates to devices for blocking the re-activation of power to a damaged electrical installation.

The purpose of the invention is to increase the reliability of blocking when working with a block, the output of which is normally under voltage.

The drawing shows a circuit diagram illustrating the operation of the device with an electric shock protection unit with three-phase asymmetrical, two-phase and single-phase ground connections, including single-phase contact of current-carrying parts.

The protection block contains a zero-sequence current transformer 1, which is equipped with a current sensor — an input signal sensor. three-stage amplifier 2 transistors 3-5, the output body 6 of the protection unit, shunted by a protective diode 7; The power supply unit of amplifier 2 includes a voltage transformer 8, a rectifying bridge 9 and a smoothing filter 10; switching ainiapaT 11 with power contacts 12, as well as closing 13, 14 and disconnecting 15 control contacts; a blocking relay 16 with a breaker 17 and the normally closing 18 contacts in the power supply circuit of the relay 16, parallel to contact 18 is connected the first closing contact 14 of the switching device 11, to the power supply circuit of which the breaking contact 17 is connected in parallel with the second closing contact 13 of the switching device 11. The lamp 19, receiving power through the opening of the contact 15, lights up and signals a malfunction. The output body 6 has closing contacts 20 and 21, one of which (contact 21) is connected to the power supply circuit of the switching device 11. Through the button 22 "Stop to the power supply, parallel connected windings of the blocking relay 16 and the switching power supply unit 11 are connected The start button 23 is connected in series with the break contact 17 of the latching relay 16. The stop 22 and start 23 buttons 22 control the switching off and on of the protection unit.

The device works as follows, it follows. When the supply voltage is applied to the amplifier 2 by pressing the button 23 "The start transistor 5 is in the open state, the transistor 4 is closed, the transistor 3 is in the amplifying mode, operating current flows through the winding of the output unit 6, and its contacts 20 and 21 are closed. The switching device 11 is turned on via the disconnecting contact 17 of the blocking relay 16 and then is powered through its own closing contact 13. Through the power contacts 12, the voltage is applied

on electrical installation. The blocking relay 16 is turned on via the closing contact 14 of the switching device 11 and becomes self-powered via its own closing contact 18. The opening contact 17 of the blocking relay 16 breaks the power supply circuit of the switching device 11 through the button 23 "Start. Contact 15 of the switching device 11 opens the PIT, PIA signaling lamp 19 circuit.

In the normal mode, when the unit is turned off by acting on the button 22 "Stop, the power of the amplifier 2 stops, the input element 6 de-energizes 6, 5 the power supply circuit of the switching device 11 and the blocking relay 16 is interrupted. The circuit returns to its original state.

When opened to earth in an electrical receiver, a sinusoidal signal is extracted in the secondary winding of transformer0.

torus I, negative half-wave opens

transistor 3. In the collector circuit of this transistor 3, an amplified signal is extracted, which is fed to the base of transistor 4. A node consisting of transistors 4 and 5,

5 forms a circuit in which the relay modes of filling transistor 4 and cutoffs of transistor 5 develop. Output body 6 de-energizes and opens its contacts 20 and 21 in the power supply circuit of amplifier 2 and switching device 11, which depletes the electrical receiver from the mains, and its disconnecting contact 15 supplies power to the fault signal lamp 19. In this case, the device is turned on again by the button 23 "Start and". The ringing mode of operation becomes impossible, since the blocking relay 16 remains under voltage and its disconnecting contact 17 breaks the power supply circuit of the switching device 11. In this case, the supply of voltage to the electrical receiver is possible only after release

 device button 22 "Stop.

Claims (1)

Invention Formula A device for blocking the re-activation of 5 power supplies to a damaged electrical installation, containing the closing contact of the output body of the protection unit, as well as connected to the power source through the Stop button connected in parallel by the winding of the blocking relay and the winding of the switching device, while own closing contacts, and in the power supply circuit of the switching apparatus - the start and opening contacts of the blocking relay - in series, 5 that, in order to increase the reliability of blocking when working with a protection unit, the output body of which is normally under the example of .j13175574 is connected, parallel to the closing contact-kirovochny relay connected second again the interlocking relay is connected to the first-entered closing contact of the newly added closing contact of the switching device, to the power circuit of which the mutating apparatus, and parallel to the push-button is the mentioned closing contact ke “Start and disconnecting contact of the output block of the protection unit.