SU1288780A1 - Current relay - Google Patents

Abstract

The invention relates to the field of low-voltage electrical apparatus, in particular, to a current switch on reed switches. The purpose of the invention is to (the dependence of the current setting on the rate of change of current. With increasing current in track bus 1, the magnetomotive force increases in the area where the reed switch (H) 2 is located, which causes the contact closure D 2. The setting of the relay is regulated changing the location of G 2 and depends on the design of the magnetic shunt 3. By varying the number of turns of the short-circuited winding 4, it is possible to achieve that the effect of the current rise rate for a given range of its change on the current setting value minimum. 1 ill. W I / S 00 bo | c %%%% j

Description

ten

11288780

This invention relates to electrical engineering, in particular, to current relays on reed switches.

The purpose of the invention is to reduce the dependence of the current setting on the rate of change of current.

The drawing shows one of the variants of the current relay.

The current relay contains an MDS source, made in the form of a current-carrying bus 1, a magnetic shunt 3 located in a magnetic field, a magnetic shunt 3, which is enclosed by a short-circuited winding 4, at least one turn, with a magnetic contact 2 located between busbar 1 and magnetic shunt 3.

Current relay operates as follows.

As the current in the busbar 1 increases, the MDS in the area where the magnetically controlled contact 2 is located increases, which causes the contact closure of the 25 contact parts of the magnetically controlled contact 2. The trigger setting of the relay is adjusted by changing the location of the magnetically controlled contact 2 and depends on magnetic shun designs. that 3

With a slowly rising current

 di tj .p, and the magnitude of the current at the instant of tripping is constant and equal to the static setpoint current.

When current is monitored increases

with greater speed t. that when

the absence of a short-circuited winding 4 causes an increase in the current setting. Due to the presence of a short-circuited winding 4, the magnitude of the magnetic resistance of the magnetic shunt 3 with uve-di

15: -: - increases, and the coefficient K decreases, which reduces the current setting. With this intense

the effect of -: - on the coefficient K for-dt

20

thirty

depends on the number of turns and the internal resistance of the short-circuited winding 4. By varying the specified parameters of the short-circuited winding 4, it is possible to achieve that the effect of the current rise rate for a given range of its change on the current setting value is minimal.

Claims (1)

Invention Formula Current relay containing a source of MDS, made in the form of a current-carrying bus, a magnetically controlled contact and. a magnetic shunt, characterized by 35 e so that, in order to reduce the dependence of the current setpoint on the rate of change of the current, it is provided with a short-circuited winding consisting of at least one turn and the location of the magnetic control located on the magnetic shunt, Led contact 2; magnetically controlled contact half way triggered magnetically between the busbar and the magnetically controlled contact 2. a shunt. l - chM where iW - ampere turns created by the current-carrying element; K - coefficient depending on the shape, location and resistance of the magnetic shunt, on the parameters -sr. Editor N.Rogulich Compiled by M. Trofimova Tehred L. Serdyukova Proofreader L. Patay Order 7816/52 Circulation 721. Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 . Production and printing company, Uzhgorod, st. Project, 4 With a slowly rising current  di tj .p, and the magnitude of the current at the instant of tripping is constant and equal to the static setpoint current. When current is monitored increases with greater speed t. that when the absence of a short-circuited winding 4 causes an increase in the current setting. Due to the presence of a short-circuited winding 4, the magnitude of the magnetic resistance of the magnetic shunt 3 with uve-di 5: -: - increases, and the coefficient K decreases, which reduces the current setting. With this intense the effect of -: - on the coefficient K for-dt depends on the number of turns and the internal resistance of the short-circuited winding 4. By varying the specified parameters of the short-circuited winding 4, it is possible to achieve that the effect of the current rise rate for a given range of its change on the current setting value is minimal. Invention Formula