SU1439698A1 - Device for shorting protection of three-phase shunting reactor - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to relay protection of substation elements, in particular, protection of a reactor. The purpose of the invention is higher speeds and sensitivities. For this purpose, a differential current protection relay of the compensation reactor is inserted into the device, connected via intermediate current transformers 5 fixation blocks, respectively, to the on position of the earthing switch and to the disconnecting position of the compensation reactor, the OR block, the inhibit unit, and the output unit. This device provides fast shutdown of ultrasound on the neutral terminals of the shunt reactor and its busbar when a cogeneration reactor is connected in a single-phase automatic re-connection cycle of the transmission line. 1 il.

Description

The invention relates to electrical engineering, and in particular to relay protection of substation elements.

The purpose of the invention is to increase the reliability of operation with the current speed increase and the sensitivity of the HOCTHi

The drawing shows the practical scheme of the device.

The device is designed to interlock the shunt reactor 1 connected to the power line of wiring switch 2. The device contains differential current device 3 connected to two groups of current transformers 4 and 5, which are integrated respectively into linear and neutral, terminals shunt reactor 1 "current protection unit 6 zero-phase ovative stem connected to the third group of current transformers 7, built into the shunt reactor bushes on the side of its neutral inlets, which through zasheg-shyucht the carrier 8 is connected to ground, two different daily transformers 9 and 10 of the current, a differential current protection relay 1 of the compensation re- ajcTopa 12, fixing blocks corresponding to the ECiir o on position 13 behind the ero disconnector 8 and the disconnected foot 14 of the disconnector 15 at a price -a sensational reactor 12, element Ш1И 16, block 17 of the prohibition and output block 8, the output of which is connected to the control circuit 1 9. The output pin 20, shunt the sequential circuit from the compensating ion reactor 1 2 and the resistor 21 "

The primary windings of intermediate current transformers 9 and 10 are connected respectively to the neutral wire of the third group of current transformers 7 of the shunt reactor 1 sequentially with its current unit 6 behind the zero sequence and to the fourth current transformer 22, which is connected to the circuit.

The device works as follows D

In the normal mode of operation, aasei-s-luschtp-i disconnector terminal 8 is disconnected;

barrel disconnector 15 in tssi

of a condensed reactor of 12 V-shochek, high Jpacher 20j ptuntirzyushdy compensation, w reactor n the resistor 21, is included, DIM erentsialny protection 1 i kompleks0

0

five

five ; ten

0

five

0

five

of the reactor 12 is not blocked, since there is no signal at the input of the bar 17, and it does not work unnecessarily with an external short circuit, since the current and the intermediate weir transformers 9 and 10 are the same in both transformers 7 and 22. the current, and therefore, in protection 11, there is only an unbalance current from which it is tuned.

In the case of short circuits at the neutral terminals of the 1st reactor or busbar when connecting the compensation reactor 12 in the CYSRSL single-phase automatic re-activation of LISP1 transmission, when the switch 20 is disconnected, the short-circuit current of the transformer 7 flows through the intermediate current transformer 9 current. The differential task 1 of the compaction reactor 125 operates which, through prohibition block 17, acts on output unit 18, which in turn, through control circuit 19, acts to turn on the chute 20, ensuring quick disconnection of the short-circuit, When the earthing switch 8 is turned on, For example, at the time of repair of the compensation reactor 12 and when the disconnector 15 is switched on or off in the chain of the compensation reactor 12, the differential protection 11 of the compensation reactor 12 is blocked, which in this mode can t work too At external faults. Jl / iH from the above specified blocking of differential protection is provided. The same is provided in the case of disconnecting the working disconnector 15 to the compensation reactor 12,

In this way, a high sensitivity of the protection and an instantaneous, without delay time, disconnection of the short circuit to the neutral leads of the shunt reactor and its busbar is achieved, as a result of which the goal is achieved.

Formula and 3 about b. rete n

A short-circuit protection device for a three-phase shunt reactor with line outputs and the first group of transs to tokp armators, phase to line terminals, with neutral inlets and second and third .rpynnat-ni tra;

current, built-in phase to neutral leads, connected to the power line with line leads, phase to phase through the first switch, and to the terminal, connected to the combined neutral leads and connected in series single-phase operating disconnector, compensating reactor, resistor and current transformer, which are bridged grounded a disconnecting switch, the compensating reactor {} and resistor being also compensated by a second switch, the neutral leads of the secondary windings of each transformer group, t combined with the first differential current relay, the fuzz and neutral inputs of which are intended to be connected to the corresponding secondary windings of the first and second current transformer groups, as well as light zero-sequence current protection, the first input of which

fixing the position of the working and grounding disconnectors, the control unit of the second switch J is the OR element, the prohibition unit and the output unit whose output is connected to the control unit 3 of the second switch, and the input to the output of the prohibition unit, the first input of which is connected to you the second differential current relay, and the second input - to the output of an IGSh element; the first to the second inputs of which are connected to the outputs, respectively, of the first and second blocks

15 fixing of the wedge respectively of the working and grounding disconnectors, the secondary windings of the first and left interconnecting current transformers are connected to each other and connected to the inputs of the second differential current relay5 the first input of the primary winding of the first intermediate current transformer is connected to the second input of the current protection unit 1 sequence and WTO

It is intended to be connected to the combined phase terminals of the secondary windings of the third group of current transformers, characterized in that, in order to increase the reliability of the function by restoring speed and sensitivity, the first and second intermediate transformers are additionally introduced

current, the second differential current - 35 windings of the mentioned fourth transvo relay 5 first and second blocks

The primary input of the first intermediate current transformer is designed to connect to the terminal. the fused combined neutral leads of the third secondary windings

groups of current transformers, the primary winding of the second intermediate current transformer is designed to be connected to the terminals of the secondary

current format

Claims (1)

Device for protecting the short circuit of a three-phase reactor with linear leads and a first group of current transformers integrated in phase to linear outputs, with neutral leads and second and third groups of current transformers integrated in phase to neutral leads connected to the power line by linear leads in phase through the first switch and to the ground - through connected, to the combined-neutral conclusions and ** connected in series single-phase working disconnector, compensating reactor, resistor and quarters a current transformer, which is shunted by a grounding disconnector, 'moreover, a compensating reactor and a resistor are also shunted by a second switch, the neutral terminals of the secondary windings of each group of the current transformer are combined, containing the first differential current relay, the phase and neutral terminals of which are designed to connect to the corresponding secondary windings of the first and the second group of the current transformer, as well as the zero-sequence current protection unit, the first input of which 25 is intended for I connect to the combined phase terminals of the secondary windings of the third group of current transformers, characterized in that, in order to increase the reliability of operation by increasing. speed and sensitivity, additionally introduced the first and second intermediate current transformers, the second differential current relay, the first and second fleas for fixing the position of the working and ground disconnectors, the control unit of the second switch, the θ element OR, the inhibit block and the output unit whose output is connected to the control unit the second switch, and the input to the output of the prohibition block, the first input of which is connected to the output of the second differential current relay, ε the second input to the output of the OR element, the first to the second the first inputs of which are connected to the outputs of the first and second blocks 15. respectively, fixing the position of the working and grounding disconnectors, the secondary windings of the first and second intermediate current transformers are connected to each other and connected to the inputs of the second differential current relay, the first input of the primary winding of the first an intermediate current transformer is connected to the second input of the zero-sequence current protection block, and the second input of the primary winding of the first intermediate transform ora current intended for connection to a neutral combined upo- minutes vy30 Waters third group of secondary windings of current transformers, the primary winding of the second intermediate current transformer intended for connection to the terminals of the secondary winding 25 of said fourth current transformer.