SU928455A1

SU928455A1 - Electromagnetic relay with braking

Info

Publication number: SU928455A1
Application number: SU802912133A
Authority: SU
Inventors: Владимир Филиппович Зинченко; Валерий Павлович Будовский
Original assignee: Ставропольский политехнический институт
Priority date: 1980-04-17
Filing date: 1980-04-17
Publication date: 1982-05-15

Description

Изобретение относится к электротехнике и может быть использовано в дифференциальных токовых защитах при больших токах небаланса.The invention relates to electrical engineering and can be used in differential current protection at high unbalance currents.

Известно реле с магнитным торможе нием,содержащее насыщающийся трансформатор, первичные обмотки (рабочие и уравнительные), вторичную обмотку, состоящую из двух секций, реле тока, подключенное к части витков вторичной ' обмотки, и резистор для плавной подрегулировки тока срабатывания, подключенный к полному числу витков этой обмотки, а также тормозную обмотку [1).A relay with magnetic braking is known, containing a saturable transformer, primary windings (working and equalizing), a secondary winding consisting of two sections, a current relay connected to a part of the turns of the secondary 'winding, and a resistor for smoothly adjusting the operating current connected to a full number turns of this winding, as well as the brake winding [1).

Реле имеет низкий коэффициент торможения, тормозная характеристика зависит от углов между тормозным и рабочим токами, имеет большую потребляемую мощность и сложную конструкцию.The relay has a low braking coefficient, the braking characteristic depends on the angles between the braking and operating currents, has a large power consumption and a complex structure.

Известно также электромагнитное _мтоковое реле, содержащее якорь, выполненный в виде качающегося лепестка, магнитопровод с рабочей обмоткой и шунт из ферромагнитного материала с обмоткой, замкнутой на ключевой эле-, мент, размещенный с зазором относитель но полюсов магнитопровода и параллельно якорю И.It is also known _m the electromagnetic current relay, comprising an anchor configured as a rocker lobe, a magnetic shunt and the run winding of a ferromagnetic material and a coil closed to the key element, cop disposed with a gap with respect to the magnetic poles of the armature and in parallel I.

Реле обладает широкими функциональными возможностями и позволяет производить дистанционное измерение установки, ноне позволяет осуществлять автоматическое заглубление дифференци* альных защит при внешних токах КЗ.The relay has wide functional capabilities and allows remote measurement of the installation, but it does not allow automatic deepening of differential * protection at external short-circuit currents.

Цель изобретения - упрощение реле и уменьшение потребляемой мощности путем автоматического заглубления с высоким коэффициентом торможения, обеспечение тормозной характеристики, не зависящей от углов между тормозным и рабочими токами.The purpose of the invention is to simplify the relay and reduce power consumption by automatically deepening with a high braking coefficient, providing braking characteristics that are independent of the angles between the braking and operating currents.

Поставленная цель достигается тем, что в электромагнитное реле с торможением, содержащее якорь, выполненный в виде качающегося лепестка, магнитопровод с рабочей обмоткой и шунт из ферромагнитного материала с обмоткой, функционально связанной с коммутационThis goal is achieved by the fact that in an electromagnetic relay with braking, containing an armature made in the form of a swinging petal, a magnetic circuit with a working winding and a shunt of ferromagnetic material with a winding functionally connected to the switching

928455 4 ным элементом и размещенной с зазором относительно полюсов магнитопровода и параллельно якорю, дополнительно введен промежуточный трансформатор тока, а коммутационный элемент выполнен уп- 5 . равняемым, при этом вход управляемого коммутационного элемента присоединен к обмотке ферромагнитного шунта, выход - к вторичной обмотке промежуточного трансформатора тока, средняя ю точка первичной обмотки которого присоединена к одному из выходов рабочей рбмотки реле»928455 with a fourth element and placed with a gap relative to the poles of the magnetic circuit and parallel to the armature, an intermediate current transformer is additionally introduced, and the switching element is made up-5. equal, while the input of the controlled switching element is connected to the winding of the ferromagnetic shunt, the output to the secondary winding of the intermediate current transformer, the middle point of the primary winding of which is connected to one of the outputs of the working relay winding "

На фиг. 1 показана принципиальная схема реле; на фиг. 2 - возможный 15 вариант конкретного выполнения; на фиг. 3 “ экспериментально снятая тор·* мозная Характеристика реле.In FIG. 1 shows a circuit diagram of a relay; in FIG. 2 - a possible 15 embodiment; in FIG. 3 “experimentally shot torus * * brain Relay characteristic.

Реле содержит магнитопровод 1,рабочую обмотку 2, ферромагнитный jo шунт 3, якорь 4, обмотку 5, управляемый коммутационный элемент и промежуточный трансформатор тока 6, выпрямительный мост 7, конденсатор 8, резистор 9» выпрямительный мост 10, 25 диод 11.The relay contains a magnetic circuit 1, a working winding 2, a ferromagnetic shunt 3, an armature 4, a winding 5, a controlled switching element and an intermediate current transformer 6, a rectifier bridge 7, a capacitor 8, a resistor 9, a rectifier bridge 10, 25 diode 11.

С увеличением активного сопротивления в цепи обмотки ферромагнитного шунта ток срабатывания реле увеличивается. С увеличением тормозного то- зо ка увеличивается напряжение, что приводит к увеличению сопротивления управляемого коммутационного элемента й соответственно тока срабатывания реле (фиг. 1). ₃$With an increase in the active resistance in the winding circuit of the ferromagnetic shunt, the relay operating current increases. With an increase in the braking current, the voltage increases, which leads to an increase in the resistance of the controlled switching element d, respectively, of the relay actuation current (Fig. 1). ₃ $

Электромагнитное реле (фиг. 2/ работает следующим образом.An electromagnetic relay (Fig. 2 / works as follows.

Напряжение с обмотки.шунта выпрямляется диодным мостиком 10 и замыкается через диод 11 и резистор 9. При отсутствии тормозного тока напряжение на вторичной обмотке трансформатора равно нулюи ток срабатывания рет ле определяется только величиной сопротивления резистора 9. При наличии тормозного тока появляется напряжение, выпрямляется диодным мостиком 7 и сглаживается конденсатором 8, запирая диод ;11, таким образом, ток в обмотке шунта не будет протекать, пока напряжение моста 10 не превысит входного напряжения моста 7, откуда с увеличением тормозного тока увеличивается ток срабатывания реле.The voltage from the winding of the shunt is rectified by the diode bridge 10 and closed through the diode 11 and resistor 9. In the absence of a braking current, the voltage on the secondary winding of the transformer is equal to zero and the response current of the relay is determined only by the resistance value of the resistor 9. In the presence of braking current, a voltage appears, rectified by the diode bridge 7 and is smoothed by the capacitor 8, locking the diode; 11, thus, the current in the shunt winding will not flow until the voltage of the bridge 10 exceeds the input voltage of the bridge 7, whence with an increase With current, the response current of the relay increases.

Применение предложенного изобретения позволит существенно упростить конструкцию реле, уменьшить габариты и потребляемую мощность, повысить надежность работы защиты за счет увеличения коэффициента торможения и независимости тормозной характеристики от углов между тормозным и рабочим токами.The application of the proposed invention will significantly simplify the design of the relay, reduce the size and power consumption, increase the reliability of the protection by increasing the braking coefficient and the independence of the braking characteristic from the angles between the braking and operating currents.

Claims

The invention relates to electrical engineering and can be used in current differential protection at high unbalance currents. A relay with magnetic braking is known, containing a saturable transformer, primary windings (operating and equalizing), a secondary winding consisting of two sections, a current relay connected to a part of the turns of the secondary winding, and a resistor for smoothly adjusting the actuation current connected to the total number of turns This winding, as well as the brake winding 1} The relay has a low braking coefficient, the braking characteristic depends on the angles between the braking and operating currents, has a high power consumption and a complex structure. It is also known an electromagnetic current relay containing measles, made in the form of a swinging petal, a magnetic circuit with a working winding and a shunt made of ferromagnetic material With a winding closed at a key element, placed with a gap relative to the poles of the magnetic flux and parley zj. The relay has a wide functionality and allows for remote measurement of the installation, but does not allow for the automatic deepening of differential protection at external short circuit currents. The purpose of the invention is to simplify the relay and reduce power consumption by automatically deepening with a high braking rate, providing a braking performance that does not depend on the angle between the bargaining and the operating currents. The goal is achieved by the fact that the electromagnetic relay with braking, containing measles, made in the form of a swinging petal, a magnetic circuit with a working winding and a shunt of ferromagnetic material with a winding, functionally connected to the switching element and placed with a gap relative to the magnetic poles and parallel to the measles , an intermediate current transformer is additionally introduced, and the switching element is controlled, with the input of the controlled switching element connected to the winding fer omagnitnogo shunt output - to an intermediate transformer secondary winding current, the midpoint of the primary winding of which is connected to one of the working rbmotki relay outputs Fig. 1 is a circuit diagram of a relay; in fig. 2 - a possible variant of a specific implementation; in fig. 3 - experimentally decelerated relay characteristic. The relay contains magnetic core 1, working winding 2, ferromagnetic shunt 3, measles, winding 5, controlled switching element and intermediate current transformer 6, rectifying bridge 7, capacitor 8, resistor 9 rectifying bridge 10, diode It. As the active resistance in the winding circuit of a ferromagnetic shunt increases, the current of the relay will increase. As the braking current increases, the voltage increases, which leads to an increase in the resistance of the controlled switching element and, accordingly, in the relay operation current (Fig. 1). The electromagnetic relay- (Fig. 2 / operates as follows. The voltage from the shunt winding is rectified by a diode bridge 10 and closed through diode 11 and a resistor 9. In the absence of a braking current, the voltage on the secondary winding of the transformer is equal to the actuation current of the switch is determined only by the resistance value of the resistor 9. When there is a braking current, a voltage appears, it is rectified by a diode bridge 7 and smoothed by a capacitor 8, blocking the diode; 11, thus, the current in the shunt winding will not leak, due to the bridge voltage 10 does not exceed t input voltage of bridge 7, from which, with an increase in the braking current, the relay actuation current increases.Application of the proposed invention will significantly simplify the relay design, reduce overall dimensions and power consumption, increase the reliability of the protection by increasing the braking coefficient and independence of the braking characteristic from the angles between braking and operating currents. Formula of the invention Electromagnetic relay with braking, containing measles, made in the form of a swinging petal, magnetic circuit with s coil and a shunt of a ferromagnetic material and a coil operatively associated with ko11mutatsionnym member and disposed with a gap with respect to the magnetic poles and parallel to the armature, characterized in that in order to exercise "Exalt relay and reducing power consumption by automatically desensitization relay with high | o effeciveness of braking, providing independent braking characteristics of the angles between braking and operating current, an intermediate current transformer is additionally introduced into rtero, and the switching element is controlled, while the input of the controlled switching element is connected to the winding of the ferromagnetic shunt, the output to the secondary winding of the intermediate current transformer, the middle point of the primary winding of which is connected to one of the conclusions of the working winding of the relay. Sources of information taken into account in the examination 1.Alekseyev B.C. and others. Relay protection. M., Energia 1976, DZT series relay.

2. USSR author's certificate according to W 2709557, cl. And 01 H 51/30., 1979.

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