SU1571723A2

SU1571723A2 - Electric three-phase circuit with zero phase

Info

Publication number: SU1571723A2
Application number: SU884458258A
Authority: SU
Inventors: Анатолий Корнеевич Шидловский; Александр Дмитриевич Музыченко; Алексей Петрович Трофименко; Валерий Вячеславович Лога; Владимир Владимирович Хоменко; Петр Никанорович Заика; Михаил Яковлевич Бочарников
Original assignee: Институт Электродинамики Ан Усср
Priority date: 1988-05-30
Filing date: 1988-05-30
Publication date: 1990-06-15

Abstract

Изобретение относитс к электротехнике, в частности к электрическим трехфазным сет м, питающим электроприемники, восприимчивые к нарушени м качества электроэнергии. Целью изобретени вл етс повышение качества электроэнергии у восприимчивых к нему электропотребителей путем обеспечени на них трехфазной симметричной системы напр жений при обрыве одной из фаз питающей сети. Электрическа трехфазна сеть состоит из трехфазной системы 1, к которой подключены электроприемники 12, 13, 14, нарушающие качество электроэнергии, и преобразователь 2 трехфазной системы напр жений без нулевого провода в трехфазную систему 3 с нулевым проводом, к которой подключены электроприемники 15, 16, 17, восприимчивые к нарушению качества напр жени . Ключ 11 позвол ет замыкать искусственный нулевой провод системы 3 и нулевой провод системы 1. Блок коммутации ключа 11 состоит из датчиков 5, 6, 7 тока, датчиков 8, 9, 10 напр жени и логической схемы 4, осуществл ющей включение ключа 11 при отсутствии тока и напр жени в одноименных фазах, т.е. при обрыве одной фазы, и отключение его при наличии токов и напр жений во всех фазах. 1 з.п. ф-лы, 3 ил.The invention relates to electrical engineering, in particular, to three-phase electric networks supplying power receivers susceptible to disturbances in power quality. The aim of the invention is to improve the quality of electric power in susceptible electric consumers by providing them with a three-phase symmetric voltage system when one of the phases of the supply network is broken. An electric three-phase network consists of a three-phase system 1, to which electrical receivers 12, 13, 14 are connected, which violate the quality of electric power, and a converter 2 of a three-phase voltage system without neutral wire to a three-phase system 3 with zero wire, to which electrical receivers 15, 16, 17 are connected. susceptible to disturbed voltage quality. The key 11 allows to close the artificial neutral wire of the system 3 and the neutral wire of the system 1. The switching unit of the key 11 consists of current sensors 5, 6, 7, voltage sensors 8, 9, 10 and logic circuit 4 that switches on the key 11 in the absence of current and voltage in the phases of the same name, i.e. at break of one phase, and its shutdown in the presence of currents and voltages in all phases. 1 hp f-ly, 3 ill.

Description

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Claims

Claim

1. Electric three-phase network with a zero phase auth.St. N2 1304124, characterized in that, in order to improve the quality of electric power in susceptible electric consumers by providing a three-phase symmetric system of voltages on them when one of the phases of the supply network is broken, it is equipped with a key, block 1571723

a com switch that closes the key when one of the phases breaks and opens it when the break is removed, the key is connected between the artificial zero phase and the zero phase of the network, and its control input is connected to the output of the key switching unit; A three-phase voltage system without a zero phase into a three-phase voltage system with an artificial zero phase is made with galvanically connected inputs and outputs.

2. The electrical network according to claim 1, 1, and 3, is that the key switching unit consists of three current sensors, three voltage sensors and a logic circuit whose output is the output of the key switching unit, with the inputs of the voltage sensors connected to phase voltage of a three-phase system with an artificial zero phase, and the inputs of current sensors are connected to the network phases between its input terminals and converter terminals directly before the last, the outputs of voltage sensors and currents are connected to the inputs of the logic circuit Turning on the key in the absence of current and voltage in the same phases and disconnecting it in the presence of both current and 15 voltages in all phases.

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