SU743068A1

SU743068A1 - Protection electromagnetic relay

Info

Publication number: SU743068A1
Application number: SU782613294A
Authority: SU
Inventors: Владимир Филиппович Зинченко
Original assignee: За витель
Priority date: 1978-05-04
Filing date: 1978-05-04
Publication date: 1980-06-25

Description

Изобретение относится к электротехнике я может быть использовано в системах релейной зашиты, в частности для токовых отсечек мощных линий электропередач высокого напряжения.The invention relates to electrical engineering, I can be used in relay protection systems, in particular for current cutoffs of powerful high voltage power lines.

Известны электромагнитные реле защи- ⁵ты, у которых отсутствует отстройка от апериодических токов, а вибрация контактов устраняется за счет местного насыщения стали магнитопровода и использования инерционного устройства £1^. Однако указанное реле обладает низкой чувствительностью и малым быстродействием. ⁵ electromagnetic protection relays are known for which there is no detuning from aperiodic currents, and the contact vibration is eliminated due to local saturation of the magnetic circuit steel and the use of an inertial device £ 1 ^. However, this relay has a low sensitivity and low speed.

Прототипом предложенного устройства является электромагнитное реле защиты, _1$содержащее магнитопровод с размешенной на нем обмоткой возбуждения, якорь и короткозамкнутую обмотку [2].The prototype of the proposed device is an electromagnetic protection relay, _{$ 1} containing a magnetic circuit with an excitation winding placed on it, an armature and a short-circuited winding [2].

Недостатком устройства- является сложность конструкции и низкая надежность, _мтак как осуществлена только частичная отстойка реле от апериодического тока.Device- drawback is the complexity of construction and low reliability, because _m effected only partial otstoyka relay deadbeat current.

Пель изобретения - упрощение конструкции и повышение надежности.Pel invention - simplifying the design and improving reliability.

Для этого устройство снабжено ферромагнитным шунтом и резистором, ферромагнитный шунт расположен между полюсами магнитопровода и якорем с зазором по отношению к ним, короткозамкнутая . обмотка размешена на ферромагнитном шунте и замкнута «а резистор.For this, the device is equipped with a ferromagnetic shunt and a resistor, a ferromagnetic shunt is located between the poles of the magnetic circuit and the armature with a gap in relation to them, short-circuited. the winding is placed on a ferromagnetic shunt and is closed and the resistor.

Креме того, в указанном электромагнитном реле защиты резистор может быть выполнен из материала с малым температурным коэффициентом сопротивления.In addition, in the specified electromagnetic protection relay, the resistor can be made of a material with a low temperature coefficient of resistance.

На фиг. 1 изображено электромагнитное реле защиты: на фиг. 2 - осциллограмма, иллюстрирующая работу реле.In FIG. 1 shows an electromagnetic protection relay: in FIG. 2 is a waveform illustrating the operation of a relay.

Электромагнитное реле зашиты содержит магнитопровод 1, обмотку возбуждения 2, ферромагнитный шунт 3, размещенную на нем короткозамкнутую обмотку 4, которая замкнута на резистор 5 и якорь 6. Ферромагнитный шунт отделен от полюсов магнйтопровода и якоря немагнитными зазорами 7. При питании реле током Тр, содержащим апериодическую составляющую, соответствующий ему магнитный поток разветвляется. Апериодическая составляющая потока замыкается через ферромагнитный шунт 3, а переменная, вытесненная обмоткой 4, поступает в якорь 6, За счет немагнитного зазора 7 между полюсами магнитопровода 1 и ферромагнитным шунтом 3 насыщение магнитной системы устанавливается и постоянная составляющая в токе реле не оказывает влияния на ток срабатывания. Время срабатывания не увеличивается. При наличии зазора 7 уменьшается остаточная индукция и связанный с нею разброс тока срабатывания. Первая и третья гармоники потока вытесняются короткозамкнутой обмоткой 4 и измененными начальными фазами. Величина сопротивления согласующего резистора выбирается таким образом, чтобы обеспечивался сдвиг между первой и третьей гармониками потока якоря, достаточный для срыва вибрации контактов. Из осциллограммы тока реле Iр и потока якоря видно, что при характерной пикообразной форме тока, поток якоря приближается к прямоугольному, что обусловливает устранение вибрации якоря реле и надежное замыкание его контактов. В качестве материала резистора используется сплав с малым температурным коэффициентом сопротивления, причем, последнее дополнительно улучшает термостабильность репе.The electromagnetic relay of the protection contains a magnetic circuit 1, an excitation winding 2, a ferromagnetic shunt 3, a short-circuited winding 4 placed on it, which is shorted to a resistor 5 and an armature 6. The ferromagnetic shunt is separated from the poles of the magnetic circuit and the armature by non-magnetic gaps 7. When the relay is supplied with current Tr containing aperiodic component, the corresponding magnetic flux branches. The aperiodic component of the flow closes through the ferromagnetic shunt 3, and the variable displaced by the winding 4 enters the armature 6. Due to the non-magnetic gap 7 between the poles of the magnetic circuit 1 and the ferromagnetic shunt 3, the saturation of the magnetic system is established and the constant component in the relay current does not affect the response current . The response time does not increase. In the presence of a gap 7, the residual induction and the associated variation in the operating current are reduced. The first and third harmonics of the flow are displaced by the short-circuited winding 4 and the changed initial phases. The resistance value of the terminating resistor is selected in such a way as to ensure a shift between the first and third harmonics of the armature stream, sufficient to disrupt the vibration of the contacts. From the waveform of the relay current Ip and the armature flow, it can be seen that with a characteristic peak-like current shape, the armature flow approaches a rectangular one, which eliminates the vibration of the relay armature and reliable closure of its contacts. An alloy with a low temperature coefficient of resistance is used as the material of the resistor, and the latter additionally improves the thermal stability of the turnip.

Реле может быть выполнено на базе серийного РТ-40 с незначительными иэ- менениями.The relay can be made on the basis of the serial RT-40 with insignificant changes.

Claims

The invention relates to electrical engineering can be used in relay protection systems, in particular for cutting off high-power power lines of high voltage. Electromagnetic relays of protection are known, which have no detuning from aperiodic currents, and the vibration of contacts is eliminated due to local saturation and steel of the magnetic conductor and the use of the inoperative device l, Oanako indicated turnip has a low sense of strength with low speed. The prototype of the proposed device is an electromagnetic relay sewn together with a magnetic conductor with an excitation winding placed on it, a short-circuited measles winding 2. The device is not at rest because of the lack of reliability and reliability, since only partial aperture of the aperiodic current is implemented. The invention is a simplified design that improves reliability. For this, the device is equipped with a ferromagitic shunt and a resistor, the ferromagnetic is located between the poles of the magnetic circuit and the core with a gap in relation to them, the short-circuited winding is placed on the ferromagnetic shunt and the resistor is closed. In addition, in this electromagnetic protection relay, the resistor can be made of a material with a low temperature coefficient of resistance. FIG. 1 depicts an electrical protection relay: FIG. 2 - Osshtogram illustrating the work of a turnip. Electromagnetic protection relay contains magnetoprost 1, excitation winding 2, ferromagnetic shunt 3, placed on it short-circuited winding 4, which is closed to resistor 5 and measles 6. Ferromagnetic shunt is separated from the poles of the magnetic conductor and iucopa by non-tab gaps 7. When powered by the relay, 1p contains aperiodic component, the corresponding magnetic flux 374 is diluted. The aperiodic component of the flow closes through the ferromagnet shunt 3, and the overgrown, forced by the winding 4 enters the measles 6. It has an effect on current. The response time does not increase. With a gap of 7, the residual induction and the variation of the actuation current associated with it are reduced. The first and third harmonics of the flow are displaced with a short-circuited winding 4 and modified initial phases. The resistance value of the terminating resistor is chosen in such a way as to provide a shift between the first and third harmonics of the core flow, sufficient to disrupt the vibration of the contacts. From the oscillogram of the current of the relay Ip and the flow of shorsor fl, with the characteristic peak-shaped form of the current, the flow of the core approaches the rectangular one, which causes the elimination of the vibration of the relay's core and reliable closure of its contacts. As a material of the resistor, an alloy with a low temperature coefficient of resistance is used, the latter additionally improving the thermal stability of the relay. 4 / The relay may be implemented on the basis of serial RG-40 with minor changes. Claim 1. Electromagnetic protection relay containing a magnetic core with an excitation winding placed on it, anchor and a short-circuited winding, characterized in that, in order to increase reliability and simplify the design, the relay is provided with a ferromagnetic shunt and resistor, a ferromagnetic shunt is located between the poles of the magnetic core and with a gap in relation to them, the short-circuited winding is placed on a ferromagnetic shunt and is closed on a resistor .. 2. The protection relay according to claim 1, characterized in that the resistor is made of material with a low temperature coefficient of resistance. Sources of information taken into account in the examination 1. USSR author's certificate NO 210940, cl. H 01 H 50 / OO, 19bb.

2. USSR author's certificate number 222501, cl. H 01 H 5O / 46, 1966.

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