SU1304119A1 - Device for protecting longitudinal capacitive compensation installation - Google Patents

Abstract

Msobstvo-; ie refers to the electric power deflector, in particular, to the high-speed CPU. powerful capacitor batteries working in common networks. as well as in the beef set x e, one of the infected iron. The purpose of the invention. - | it- with increased reliability and cross. 1 lectures work. The goal is to introduce an M into the device of the second resistor 5. When the capacitors of one unit 1 are damaged, the pulse transformers 1 and 9 and 10 will work, unlike the prototype, from the supply of the capacitors of the other 6; ioi; a. 1 1 | single condensate generation; di blocks 1 allow, exclude 1 and hcmekg1 - the operation of the relay -1 neblaapspoG: -ia- shields. 1 il. and

Description

The invention relates to electric power industry, in particular, to ultrafast protection of high-power capacitor batteries operating in general-purpose networks, as well as in traction networks of electrified railways.

The purpose of the invention is to increase reliability and selectivity.

The drawing shows a diagram of the proposed device.

The installation of longitudinal capacitive compensation (CPC) consists of two blocks 1 with series of capacitors connected in series, the midpoints 2 of which are connected to the primary winding of the transformer 3 to which the unbalanced protection relay 4 is connected.

To the extreme ranks of the capacitors of the two blocks 1, across the resistors 5 are connected in series thyristor switches 6 and 7. The thyristor switch 6 is connected to transformer 8. Pulse transformers 9 and 10 with low voltage 11 and high voltage 12 windings are connected to two main 13 and 14 and pilot 15 electrodes trigatron 16, which bypasses the CPC through the restrictive reactor 17.

The security device operates as follows.

With a short circuit in the network, the CPC capacitors and the current transformer 8 flow through the short circuit current, as a result, the thyristor switches open and the outermost rows of capacitors through the resistors 5 are simultaneously discharged to the pulse transformers 9 and 10. The same currents and unbalanced protection flow through the blocks with relay 4 and current transformer 8 does not work. After the igniter trigatron 16 by means of the ignition electrode 15 is bypass. If during the passage of large short-circuit currents damage the capacitor in one row and short-circuit it, the thyristor switches will be supplied with voltage from the other row through a resistor 5. But since in this case both resistors 5 work as a voltage divider, the protection setting overvoltages are doubled. However, the coincidence of short-circuit with damage to the capacitor in the extreme range and its shorting is rare. In addition, capacitors allow a voltage boost of up to 4.2 times the nominal value (Un) twice a year. Thus, in the event of damage to one extreme row, the protection remains operable.

Compiled by K. Shi.tan

Editor L. Vselovska Tehred I. Vereye Corrector A. Zimokoyov

Order 1320/54 Circulation 619 Sub-foam

VI of the State Committee for Inventions of Discoveries

1,13035, Moscow, J.--35. Raushsk nab., 4) 5 Production and printing company, Uzhgorod, ul. Design. four

The application of the proposed device allows increasing the reliability of capacitors by increasing the reliability of the overvoltage protection and the selectivity of the unbalanced protection, since at the same time bypassing the outermost rows of capacitors of both units by pulse transformers.

Claims (1)

Invention Formula A device for protection of a longitudinal capacitive compensation unit consisting of two parallel-connected blocks, each of which has several rows of series-connected capacitors, containing an unbalanced load relay connected to the secondary winding of a current transformer, the nervous winding of which is connected To the midpoints of parallel-connected units, two pulse transformers, a trigatron, the first main electrode of which is connected to the beginning of the high-voltage winding of the first pulsed transf through the limiting reactor is connected to the first output of the protected installation, the second main electrode of the trigatron is connected to the beginning of the high voltage winding of the second pulse transformer, to the end of the low voltage winding of the same transformer and node to the second output of the protected installation, the point of connection of the ends of the high voltage windings of the first and the second pulse transformer is connected to the ignition electrode of a tri1 atron, the beginning of the low-voltage winding of the second pulse transformer is connected With the end of the low-voltage winding of the first imp, the first transformer, the beginning of which through the thyristor key and the first limiting resistor is connected to the midpoint of the extreme row of one of the blocks, the second current transformer, the primary winding of which is included in one of the terminals of the protected installation, the secondary winding is connected To the control inputs of the thyristor switch, characterized in that, in order to increase reliability and selectivity, a second limiting resistor is additionally introduced into it, the first terminal connected minutes to the junction of the first limiting resistor and thyristor switch, a second terminal connected to the midpoint of the extreme number of another block, the value of the resistances of the first and second limiting resistors is selected equal.