SU94466A1 - Device for protecting contact apparatus of mechanical rectifier - Google Patents

Description

1 is an object | I is a ycipoiiCTBO for protection of 1 tactic; oio of a machine of a rectifying rectifier by means of a short-circuit breaker short-circuiting the three-phase power line.

A distinctive feature of the device lies in the short-circuit breaking switching disconnectors. To contact bridges through two-half-double-phase single-phase three-phase B1) 11pl lttels. The like switching on of the tripping short-circuit is ensured by the short-circuit of the short-circuit to any sign of the difference of non-potentials between (by contact And bridges of different phases.

FIG. 1 shows an iri.cipital scheme of a device with a single-phase rectifier; in fig. 2 is a schematic diagram of a device with a tpeh (1) azn impedance; in fig. 3-diagram of the device using an intermediate transformer; in fig. 4-with the use of a piratron relay.

The known devices for the protection of the contact apparatus of mechanical rectifiers with double current rupture are based on the principle that when an arc arises at the contacts of the rectifier, there is a difference in 71Hs between the contact bridge and the nii-iHoii correspondingly (times. This potential difference causes current to flow Cheoez disconnecting coil korotkozamyka.te.t.

However, these devices require one or three tripping coils with separate magnetic league circuits. Moreover, they are more responsive to a certain direction. The arc current is not known, since the known designs of these devices are based on iriding a polarized magnetic circuit.

In the proposed device between the contact bridges 1, which are alternately closing the contacts 2 of a mechanical power supply connected to a three-phase network A, B, C. solid 1M-1P} m1P-eJs o 94466 are included

whether 3, collected by a single-phase full-wave bridge circuit. In the rectified current circuit of solid rectifiers there are two sections that disconnect the coils 4, which can be located on the same magnetic core.

The modification of the device of FIG. 2 provides for the use of three-phase rectifiers instead of suprameters according to the adnof aznon bridge circuit.

In this case, there are two three-phase rectifiers 3 between the contact bridges / vk.1yucheny, in the circuit, the rectified current of which also includes two sections of the tripping coil 4, located on the same magnetic core. This gives you a chance. Change gives you a chance; implement ycTpo-iiCTBO with a smaller number of rectifying washers in the middle; knowledge with a device like the one in FIG. one.

In: 1do; 1zmennisnis device but the diagram shown in the fng. 3, makes it possible to work with one disconnecting coil by switching between contact bridges / transverse windings of a transient transformer 5. The secondary winding of the transformer is connected via a single-phase washing circuit through the disconnecting coil 4.

Modifying the device but FIG. 4 from,: 1 the use of a thyratron relay is performed. In this variant, the primary windings of the intermediate transformer, the secondary winding of which is connected to the input of the solid rectifier 5, are connected between the cortex contact bridges. The external voltage is fed to the grid circuit of the thyratron 6. At a certain value of the rectifying direct voltage, the ignition turns off 6, in the anode circuit of which the disconnection coil 4 is switched on. Thus, the triggering of the hardcore switch is at the origin of the thyratron. The last version of the device makes it possible to connect to the first luster a small-sized intermediate transformer, the input winding of which has high resistance.

11 p ell: e t and l about b ete n i

Claims (4)

1. The 1D.1 device is a pin of a contact device of a mechanical rectifier made with a double break of current using a short-circuit, acting on the potential difference between the contact bridges of different phases of the contact device arising during the formation of an arc, at the contacts different from that, that , in order to ensure the operation of the short-circuit with any sign of the indicated potential difference, each of the two sections of the breaking winding of the short-circuit is connected to / two two-half-period: H, single-phase rectifiers, connected between contact bridges of different phases. 2. A modified device according to claim 1, characterized in that each of the two sections of the disconnecting winding short circuit is connected to a three-phase rectifier connected to contact bridges of different phases. 3.B | identi fi cation of the device according to clause I. characterized in that the disconnecting winding of the short circuit is connected to one two-phase single-phase rectifier, which is threaded from an intermediate transformer having two primary, the ends and the common point are electrically connected to contact bridges. 4. In the device in PP. 1-3, the application of a thyratron relay connected between the rectifiers and the tripping winding is short-circuited. I- I s -Ih i h ii te: -h  h./1 iijg I