SU1367089A1 - Device for remote protection of autotransformer of a.c. traction network - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase the selectivity of protection. The device contains current and voltage sensors connected to the traction network at the location of the autotransformer, AND, OR logic elements, null indicators. In the event of a short circuit, due to the implementation of a predetermined logic, selective disconnection of the damaged section of the contact (wire) cable of the traction network is provided. 2 Il.

Description

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The invention relates to the relay of the second input of the first logical protection — a tram network of the rail element OR 9 — and to the input of an inverter, a vehicle, namely to the protection of the first. The output of the second logical element network of the alternating current from the auto- OR 19 through the transformer control unit 20 (system 2 25 kV) is connected to the controllable key by a key and can be used for protection21. The output of the controlled switch 21 of the AC power grid is connected in parallel to the resistor 22, including the sectioning and the points sequentially in the parallel connection circuit without an autotransistor Q 23, the time of the formatting relay of formators (25 kV system ) .4 time.

The purpose of the invention is to increase the severity. In FIG. 2, the following philosophies are accepted, these are the operations of the values: the first 24 and the second 25 seconds. 1 shows the structuring of the traction network; pin and pitasheme of the proposed device, on the wires 26 and 27 tons of a govaya network,

FIG. 2 - variants of the short-circuit point 28-32 possible short sweeps of the protected network, -cans in the protected network; autotransformer Device for remote protection 33, connected to the contact

You are the autotransformer of the power supply network and the midpoint

AC contains the first 20-connected to the rail 34. Chik 1 current and voltage sensor 2, In the event of a short circuit on the first

connected to the protected line, soy section 24 t of the govt network, close to the site

with the corresponding inputs of the protection installation, at point 28 of the directional relay 3 of resistance, the directional relay 3 of which resistance is connected to the input of the relay is 25, the first zero indicator 16, the rest 4 times with the master RC time is not working NII second

I drink, the time relay output 4 is connected to the sny-indicator 17 and is triggered by the four inputs of the first 5 and second zero indicators 18. From the output of the logic elements I, the outputs of the co-converter 10 are low potential signals that are connected to the inputs of the corresponding inputs the second is the first 7 and the second 8 is the executable element 6 and blocks

body elements. To the second entry of his. From the output of the second logical

the first 5 and second 6 logic elements OR 19 high level signals are connected to the outputs, respectively, to the input of the control unit 20 of the first logic element as the key, which closes the control 9 and the inverter 10. The outputs of the second key 21 and thereby shunts

11 and third 12 current sensors off-resistor 22 in the capacitor circuit 23

sections of the traction network of connection-time of the timing circuit of the relay 4. AT

to the inputs of the first 13, second 14 and as a result, the capacitor 23 is charged

third 15 adders. Moreover, the output 40 is of another constant time, when the second current sensor 11 is connected, the clamping of the relay 4 setpoint is connected to the inputs of the first 13 and the third is done with the minimum time. Signal

 15 breeders and to the second input of the high-high level from the output of the relay 4 of the temporary adder 14, the output of the third domain goes to the first inputs of the current transponder 12 connected to the first 5 and second 6 logic elements of the second adder 14 and to the second. the second input of the first inputs of the first 13 and third 15 sum of the logical element And 5 comes

tori. The outputs of the first 13, second 14-signal high level from the output of the third third 15 adders connected to the logical element OR 9, B

to the inputs, respectively, of the first 16, gQ, the result is a high level signal with

second 17 and third 18 zero-ind-output of the first logic element

katorov. And 5 is fed to the input of the first use of the output of the first zero-indicator of 16 element of element 7 and causes it

connected to the first inputs of the first 9 operation.

and the second 19 logical elements OR, gg The second logical element And 6 is not

The output of the second zero-indicator 17 podra-sabat, as on its second

It is connected to the second input of the second log-input from the output of the null indicator 18 of the cell OR 19. The output of the inverter 10 is a signal of the lower zero indicator 18 which is connected to which level, respectively, the second element 8 does not work.

In the event of a short circuit on the first section of the 24th go network, away from the installation site of the protection, at point 29, the directional relay 3 of the resistance is triggered, the first 13 and the second 14 null indicators do not operate. The third zero-indicator 18 is triggered, and the high level signal is fed to the input of the inverter 10 and the second, the input of the first logic element OR 9. The low level signal from the output of the inverter 10 is fed to the second input of the second logic element AND 6 and blocks it. In connection with the absence at the output of the second logic element OR 19 of a high level signal, block 20

shunt the resistor 22 in the capacitor circuit 23 to the time of the timing circuit of the relay 4 time. The capacitor 23 of the time of the master circuit is charged with a small time constant, and the time relay operates with a minimum time. Due to the lack of high-level signals at the inputs of the first logic element OR 9, the low-level signal is fed to the second input of the first logic element AND 5 and blocks it, as a result it does not work and, accordingly, is not activated 15

The first actuating element 7, After the relay 4 times triggered, the high level signal arrives at the first input of the second logic element 6, which triggers and does not trigger with the key, and the second executable key 21 is triggered to open. - body element 8.

shunt the resistor 22 in the capacitor circuit 23 to the time of the timing circuit of the relay 4 time. The capacitor 23 of the time of the master circuit is charged with a small time constant, and the time relay operates with a minimum time. In connection with the absence of high level signals at the inputs of the first logical element OR 9, the low level signal arrives at the second input of the first logic element AND 5 and blocks it, as a result it does not work and, accordingly, is not activated.

volume status. As a result, the capacitor 23, the time of the master circuit is charged with a longer time constant and, when the setpoint of the relay reaches 4 times, triggers with the maximum time. In this case, the response time of the relay 4 is longer than its response time when a short circuit is near due to a slower charging of the capacitor 23 due to the presence of a resistor 22 in the charging circuit. The high level signal from the output of the first logic element OR 9 goes to the second the input of the first logical element AND 5, which triggers after the high level signal from the relay 4 arrives at its first input, and accordingly the first actuating element 7 triggers. The second logical element AND 6 does not operate It is, respectively is not activated the second actuating member 8.

In case of a short circuit on the second section 25 of the traction network, near the installation site of protection, at point 30, the directional resistance relay 3 triggers, the first zero indicator 16 does not work, the second zero indicator 17 triggers, and the third zero indicator 18 does not work. the output of the inverter 10, the high level signal is fed to the second input of the second logic element AND 6. From the output of the second logic element OR 19, the high level signal is fed to the input of the key control unit 20, which closes the control key 21 and the

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In the second section of the 25th go network, away from the protection installation site, at the point 31 only the directional resistance relay triggers, the first 16, the second 17 and the third 18 null indicators do not work. The high level signal from the output of the inverter 10 is fed to the second input of the second logic element AND 6. In connection with the absence of the high level signal at the output of the second logic element 1SH 19, the key control unit 20 does not operate and the control key 21 remains in the open state.

The capacitor 23 of the time of the master circuit is charged with a longer time constant, and when the setpoint of the relay is reached, the 4 times triggers with the maximum time. From the output of the first logic element OR 9, the low level signal arrives at the second input of the first logic element AND 5 and blocks it, as a result of which it does not work and, accordingly, does not trigger the first execution element 7. After the time relay 4 triggers, the high level signal arrives The first input of the second logic element AND 6, which is triggered and triggered by the second control element 8.

Thus, selective disconnection of the damaged section of the traction network with autotransformers is carried out.

5 .1367089

rmula of invention

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A device for remote protection of the autotransformer of the AC mains, containing the first current sensor and the voltage sensor connected to the protected line, connected to the corresponding inputs of the directional resistance relay, the output of which is connected to the input of the time relay with the driving circuit and Complete element, characterized in that, in order to increase the selectivity of the protection operation, the second and third current sensors connected to the protected line, the first, second and third sum are additionally introduced into the device A, the first, second and third null indicators, the first and second logic elements AND, the first and second logic elements OR the inverter, the key control unit and the control key, and the output of the time relay is connected to the first inputs of the first and second logic elements AND, outputs which are connected to the inputs of the first and second actuators, respectively, to the second inputs of the first and second logic elements and the outputs of the first OR logical element and the inverter, respectively, of the second and third current sensor via It is connected to the first inputs of the first and third adders and to the second input of the second adder, the output of the third current sensor is connected to the second input of the first and third adders and to the first input of the second adder, and the outputs of the first, second and third adders are connected to the inputs of the first and third adders. ditch, the output of the first null-indicator is connected to the first inputs of the first and second logical elements OR, the output of the second zero-indicator is connected to the second input of the second logical element OR, the output of which is connected through a block key management with a control key, the output of the control key is connected to the time of the master circuit of a time relay, the output of the third null indicator is connected to the inverter and to the second input of the first OR gate.

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Claims (1)

Claim A device for distance protection autotransformer AC traction, comprising a first current sensor and voltage sensor connected to the protected line connected to the respective inputs of directional resistance relay, you are a course ₁₀ of which is connected to the input of a time switch of timing chain i.ispolnitelny element characterized in that, in order to increase the selectivity of the protection, the jg device additionally introduced a second and third current sensors connected to the protected line, the first, second and third sum Odds, the first, second and third zero indicators, the first ₂₀ and the second logical elements AND, the first and second logical elements OR, the inverter, the key control unit and the controlled key, and the output of the time relay is connected to the first inputs 25 of the first and second logical elements AND the outputs of which are connected to the inputs of the first and second actuators, respectively, to the second inputs of the first and second logic gates AND the outputs of the first logical OR or inverter, respectively, are connected, the output of the second and second current sensors is connected is connected to the first inputs of the first and third adders and to the second input of the second adder, the output of the third current sensor is connected to the second input of the first and third adders and to the first input of the second adder, and the outputs of the first, second and third adders are connected to the inputs of the corresponding zero-indicators, the output of the first null indicator is connected to the first inputs of the first and second logical elements OR, the output of the second null indicator is connected to the second input of the second logical element OR, the output of which is connected through the control unit a key with a controlled key, the output of a controlled key is connected to a timing circuit of a time relay, the output of the third null indicator is connected to the inverter and to the second input of the first logical OR element. Figure 1 Cpua.z