SU1339737A1 - Apparatus for protection of three-phase electric installation from phase breakage - Google Patents

Abstract

This invention relates to electrical engineering, in particular, to relay protection. The purpose of the invention is to increase the reliability of work and ensure manufacturability. This is achieved by the fact that when an emergency condition occurs, the output of the rectifiers 5 and the corresponding stabilizers reduces the voltage. This signal enters the optocoupler 12 and through the element OR 16 acts on the executive body 17. 1 Il. pi / p (L s 00 00 with OO vl

Description

one

The invention relates to a relay technology in electrical installations and is intended to protect three-phase electrical installations from the interruption of one or two lines, as well as one or two phases and. can be used in sources of secondary power supply (iVAP).

The purpose of the invention is to improve reliability, manufacturability, and reduce weight and size.

The drawing shows a block diagram of the device.

The device contains a control unit 1, consisting of three blocks 2-4, each of which includes a rectifier 5, made according to the Hertz scheme with a capacitive filter with a parametric voltage regulator, made on the resistor 6 and on the stabilizer 7 and 8,

The rectifier inputs through dividing capacitors 9-11 are connected to two lines of monitored voltage, and the outputs of the stabilizers through matching elements are connected to the inputs of optocouplers 12-14 of the threshold node 15, the output of each of the optocouplers 12-14 is connected via the OR 16 element actuator 17, made in the form of a transistor or thyristor switch, the collector or anode circuit of which is connected to, the winding of the executive relay or the automatic switch off coil,

The device works as follows.

In normal operation, the supply voltage 3-50 Hz, 380 V is fed to the inputs of capacitors 9-11. From the output, the voltage goes to the inputs of voltage regulators and then to the corresponding inputs of the threshold node 15 and through matching elements to the inputs of optocouplers 12-14. From the outputs of the optocouplers, the signal goes to the inputs of the OR 16 element and from its output to the executive body 17, which provides the connection of the three-phase installation to the network 3-50 Hz, 380 V.

In the event of an emergency mode - gg input terminal: second capacitor

ma (break of one or two phases) on the course of the rectifiers connected to them and the corresponding stabilizers, there is a sharp decrease in the output

it is intended to be connected to the second phase wire of the network, its output - to the first input of the second meter and the second input of the first

3397372

tension In the event of a single phase break, the voltage does not drop to zero. Matching elements are used to compensate for this residual voltage. From the output of the matching device, the signal enters the optocoupler and through the element OR 16 acts on the input of the executive body 17

10 in a way that provides

Three-phase electrical installation disconnected from the network 3-50 Hz, 380 V with the help of - contacts of the executive relay or automatic three-pole switch.

The use of rectifier units and parametric stabilizers 2–4 and an optocoupler threshold node in the electrical circuit of the device makes it possible to simplify the design of the device by eliminating two voltage transformers; - to increase the manufacturability of the device, in order to protect the three-phase installation against breakage

25 phases due to the exclusion from the design of coiled goods; reduce the weight and size of the device; to simplify the adjustment of the device sharpening during operation.

Claims (1)

Invention Formula A device for protection of a three-phase electrical installation from a phase failure, containing a voltage monitoring unit with two rectifiers, the input terminals of the monitoring unit are intended to be connected to the phase conductors of the network, its outputs are connected to the threshold arcane, and the actuator differs in what; in order to increase the reliability of work and ensure manufacturability, it is additionally equipped with three capacitors and a three-input element OR, kng. The control unit is equipped with a third rectifier, while the output of each microphone is connected to a parametric voltage stabilizer, the input capacitor of the perz capacitor is designed for switching; the output to the first phase drive, and its output terminal to the first input of the first top Mitia and the second entrance of the third rectifier. it is intended to be connected to the second phase wire of the network, its output - to the first input of the second gate of the metel and the second input of the first 31339737 the rectifier, the input terminal of the third input of the second rectifier, the threshold capacitor is designed for the subassembly in each phase to be connected to the third phase conductor at the output, & output through the three networks, and the output terminal to the first input the OR element is connected to the input of the third rectifier and the second executive. to the body.