SU1686575A1 - Device for protective switching-off of a c network in case of current leak to ground - Google Patents

Device for protective switching-off of a c network in case of current leak to ground Download PDF

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Publication number
SU1686575A1
SU1686575A1 SU894718511A SU4718511A SU1686575A1 SU 1686575 A1 SU1686575 A1 SU 1686575A1 SU 894718511 A SU894718511 A SU 894718511A SU 4718511 A SU4718511 A SU 4718511A SU 1686575 A1 SU1686575 A1 SU 1686575A1
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SU
USSR - Soviet Union
Prior art keywords
output
input
threshold element
circuit
leakage current
Prior art date
Application number
SU894718511A
Other languages
Russian (ru)
Inventor
Анатолий Иванович Федоров
Виталий Иванович Шуцкий
Виктор Яковлевич Рекутин
Original Assignee
Душанбинское Проектно-Конструкторское Технологическое Бюро "Системавтоматика"
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Priority to SU894718511A priority Critical patent/SU1686575A1/en
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Publication of SU1686575A1 publication Critical patent/SU1686575A1/en

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Abstract

Изобретение относитс  к электротехнике и предназначено дл  защиты при повреждени х в электрических сет х переменного Слои неди тока. Цель изобретени  - исключение ложных срабатываний путем обеспечени  возможности адаптации к линейному . повышению токов утечки через изол цию сети. При линейном повышении тока утечки отключени  линии по цепи блока 9 дифференцировани  не происходит, поскольку втора  производна  напр жени , пропорционального току утечки, будет равна нулю. При скачкообразном увеличении тока утечки срабатывает первый пороговый элемент 11 и через схему ИЛИ 12 воздействует на цепь отключени  выключател  2. Если же уровень напр жени  превышает значение уставки, формируемое от эталонного источника , на выходе второго порогового органа 10 по вл етс  сигнал, воздействующий через схему ИЛИ 12 на исполнительный орган 13. 5 ил.The invention relates to electrical engineering and is intended to protect against damage in the electrical networks of alternating current layers. The purpose of the invention is to eliminate false positives by providing the ability to adapt to linear. increase leakage currents through network isolation. When the leakage current rises linearly, the disconnection of the line along the circuit of the block 9 does not occur, since the second derivative of the voltage proportional to the leakage current will be zero. With an abrupt increase in the leakage current, the first threshold element 11 is triggered and through the circuit OR 12 acts on the tripping circuit of the switch 2. If the voltage level exceeds the setpoint value generated from the reference source, a signal acting through the circuit appears at the output of the second threshold element 10 OR 12 to the executive body 13. 5 Il.

Description

Фие.5FI.5

Claims (1)

Формула изобретенияClaim Устройство для защитного отключения сети переменного тока при утечке тока на землю, содержащее трансформатор тока нулевой последовательности, вторичная обмотка которого подключена своими выводами к входу преобразователя ток напряжение, фильтр низкой частоты, соединенный своим выходом с входом первой дифференцирующей цепочки, функционально связанной через первый пороговый элемент с одним из входов элемента ИЛИ, а также второй пороговый элемент, соединенный своим выходом с другим входом элемента ИЛИ, подключенного своим выходом к исполнительному органу, отличающееся тем. что, с целью исключения ложных срабатываний путем обеспечения возможности адаптации к линейному повышению токов утечки через изоляцию сети, в него дополнительно введена вторая дифференцирующая цепочка, подключенная своим входом к выходу первой дифференцирующей цепочки, а выходом - к входу первого порогового элемента, при этом вход фильтра низкой частоты подключен к выходу преобразователя ток - напряжение. а выход фильтра дополнительно подключен к входу второго порогового элемента.A device for protective shutdown of the AC mains during current leakage to earth, containing a zero-sequence current transformer, the secondary winding of which is connected by its terminals to the input of the current-voltage converter, a low-pass filter connected by its output to the input of the first differentiating circuit functionally connected through the first threshold element with one of the inputs of the OR element, as well as the second threshold element connected by its output to another input of the OR element connected by its output to organ, characterized in that. that, in order to eliminate false alarms by providing the possibility of adapting to a linear increase in leakage currents through the insulation of the network, a second differentiating circuit is added to it, connected by its input to the output of the first differentiating circuit, and by the output to the input of the first threshold element, while the filter input low frequency is connected to the output of the current-voltage converter. and the filter output is additionally connected to the input of the second threshold element. Фиг. 5FIG. 5
SU894718511A 1989-07-14 1989-07-14 Device for protective switching-off of a c network in case of current leak to ground SU1686575A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU894718511A SU1686575A1 (en) 1989-07-14 1989-07-14 Device for protective switching-off of a c network in case of current leak to ground

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU894718511A SU1686575A1 (en) 1989-07-14 1989-07-14 Device for protective switching-off of a c network in case of current leak to ground

Publications (1)

Publication Number Publication Date
SU1686575A1 true SU1686575A1 (en) 1991-10-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
SU894718511A SU1686575A1 (en) 1989-07-14 1989-07-14 Device for protective switching-off of a c network in case of current leak to ground

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4142969A1 (en) * 1991-12-24 1993-07-01 Abb Patent Gmbh Fault current protection switch

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Авторское свидетельство СССР N 668036. кл. Н 02 Н 3/16. 1977. Авторское свидетельство СССР № . кл. Н 02 Н 3/16, 1979. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4142969A1 (en) * 1991-12-24 1993-07-01 Abb Patent Gmbh Fault current protection switch

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