SU1339682A1 - A.c.hybrid apparatus - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to electrically commutative electrically.m. low voltage devices, which are intended for use in electric networks of alternating current. The purpose of the invention is to increase the speed by eliminating the capacitor recharge current. To do this, in a hybrid AC device containing an electrical) 1st contact (EC) 1 connected to a napa, i- the first pair of thyristors connected counter-parallel to it, also connected in parallel to an EC 1 serial circuit from the second pair of thyristors connected counter - parallel throttle and capacitor (K) 7, control unit thyristor (UT) 8 and drive winding (SP) 9. A series circuit consisting of UT 8 and OP 9 is connected in parallel to K 7, where the anode of the control thyristor is connected to the output K 7, having a positive predvari Yelnia charge. In this case, overcharge current is not pro.hodit K 7 T 1 through EC yl. 5S (L with so with Oi oo

Description

one

The invention relates to low voltage electrical switching devices and can be used as circuit breakers, as part of power switches, etc.

The purpose of the invention is to increase the speed of the hybrid AC apparatus by reducing the current switched by the contact to the magnitude of the load current by changing the recharge circuit of the precharged capacitor.

The drawing shows a functional diagram of the proposed hybrid apparatus of alternating current.

The hybrid apparatus contains a power electrical contact 1, a first pair of anti-thyristor OE 2 and 3 connected in parallel, connected in parallel with an electrical power contact 1, a second pair of thyristors 4 and 5 connected in parallel to each other, connected in series with the choke 6 and the precharged capacitor 7 indicated the serial circuit is also connected in parallel with the electric power contact 1, the serial circuit, consisting of the control thyristor 8 and the winding 9 of the contact disconnecting drive, connect It is connected parallel to the capacitor 7 so that the anode of the thyristor 8 is connected to the output of the capacitor 7, which has a positive pre-charge.

The hybrid AC apparatus operates as follows.

The disconnect signal is fed to the control and the thyristor electrodes 2, 3 and 8. In this case, the precharged capacitor 7 (the pre-charge voltage shown in the drawing without brackets) is recharged to the value of the positive zero of the capacitor 7 - thyristor 8 - winding 9, the disconnecting drive is the negative pole of the capacitor 7. The capacitor recharge current flows through the disconnecting coil winding 9 and the contacts open. In this case, the load current i flows from the circuit of contact 1 to the circuit with a thyristor 2 or 3, depending on the direction of the current i. After the end of the recharge of the capacitor 7, the thyristor 8 is turned off, the voltage on the capacitor 7 changes sign to the opposite (shown in brackets in the drawing). After restoring the electrical strength of the contact gap (the moment of restoring the electrical strength of the contact gap, for example, can be determined by counting the time interval from the beginning Composer G. Korsakov

Editor I. Nikolaichuk Tehred I. VeresKorrektor I. Erdeyi

Order 4233/45 Circulation 697 Subscription

VNIIPI USSR State Committee for Invention)) s and discoveries

113035. Moscow, Zh-35, Raushsk nab. 4/5 Production and Printing Enterprise, Uzhgorod,. Design. four

ten

339682

The current disconnects) turn on the thyristors 4 and 5 turn on signals and remove the control signals from the thyristors 2 and 3.

Two options are possible when forcibly disconnecting thyristors 2 and 3.

In the first embodiment, the load current i flows through the thyristor 2 (the direction of the current is indicated in the drawing by the arrow). The capacitor 7 is recharged across the circuit the positive pole of the capacitor 7 - choke 6 - thyristor 5 - thyristor 2 - negative pole of the capacitor 7, and the voltage on the capacitor changes sign to the opposite (indicated in the drawing

15 asterisk). Thereafter, the charging voltage of the capacitor 7 through the choke 6 and the thyristor 4 is applied in the locking direction to the thyristor 2.

In the second embodiment, the load current flows through the thyristor 3 (the direction of the current

20 opposite to the arrow indicated in the drawing). The capacitor charge voltage (the sign is shown in brackets in the drawing) is applied through the choke 6 and the thyristor 5 in the locking direction to the thyristor 3.

In the second variant, the switching time of the current for the duration of the recharge of the capacitor 7 through the choke b is shorter than in the first one.

thirty

Claims (1)

Invention Formula A hybrid AC device containing a power electrical contact, the first pair of thyristors connected in anti-parallel, the second pair of switched on anti-parallel thyristors, a capacitor, a choke, a control thyristor, a drive winding, with the first pair of thyristors connected in anti-parallel, connected in parallel to the power terminal, the second pair connected the thyristors are connected in parallel with the choke and the capacitor, and the series circuit is also connected in parallel with the electric power contact, the control thyristor is connected in series with the drive winding, characterized in that, in order to improve speed, the series circuit containing the thyristor and the drive winding, connected in parallel with the indicated capacitor, so that the anode This control thyristor is connected to a capacitor lead, which has a positive precharge.