SU1453507A1 - Arrangement for high-frequency protection of power transmission line - Google Patents

Abstract

The invention relates to an electrician, in particular to relay protection of power lines, and can be used to protect high-voltage power lines. The purpose of the invention is to increase the reliability of the device. The device contains power direction relays 1-3 and 10-12, working in the direction of switching off and blocking, respectively, and reacting to emergency components of phase currents and voltages minus current and voltage of zero sequence, elements OR 4 and 13, elements BANKS 5 and 14, element 7, start-up unit 9, elements 8 and 15 of the delay time for return and the time delay element for triggering 6, the majority body 16. Improving the reliability of the device for high-frequency protection of the overhead line at K in single phase automatic re-activation and three-phase to in swing mode is achieved in that the power direction relays are connected in the shutdown channel according to the OR scheme with the prohibition of the disconnection signal from the receiver of the high-frequency apparatus to control the sending of the signal to the shutdown circuit by the trigger unit according to the OR scheme with the prohibition of the passage of the blocking signal by the majority body upon the fact that the two relays of the power direction go off. 1 il. (LJ JV with SP in al./yent 8411.

Description

The invention relates to electrical engineering, in particular, to devices for relay protection of power lines, and can be used to install high-voltage power lines, in particular, with OAPV.

The aim of the invention is to improve the reliability of the device,

The drawing shows a block diagram of the device.

The device for high-frequency protection of power lines contains a power direction relay 1-3, which operates in the direction of tripping, the outputs of which are connected to the OR element 4, the output of which is connected to the input of the BANE 5 element, prohibiting the input of which is connected to the receiver of the high-frequency apparatus, and the output - with the element 6 of the time delay for actuation, the output of which is connected to one of the inputs of the element 7, the second input of which through the element 8 of the time delay for the return is connected to the starting body 9, and the output of the element 7 7 a switch control circuit (output authority).

Three relays of power direction 10-12 working in the blocking direction are connected by outputs to the input of the element OR 13, the output of which is connected to the element BANE 14, the output of which through the element 15 is above, the return time delay is connected to the start of the RF transmitter, and the prohibition of the input of the element 14 is connected with the code of the majority authority 16, three inputs of which are connected to the outputs of the power direction relay, operating in the shutdown direction.

Consider the work of the device for RF protection,

At the ends of an overhead line, two identical sets of RF protection are installed. In normal mode, there are no emergency components, the power direction relays to the off and block directions, as well as the trigger body do not work. In the trip circuit of the switch and start of the RF transmit 1, the signals do not sprinkle.

In case of short circuits K, K, KB, the zone of action of protection, all three relays 1-3 of the power direction are activated, it also works; and starting body 9. Since at the opposite end of the power relay work en

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logically, i.e. three power direction relays are triggered and blocking does not work; 1 (no blocking signal is sent), the inhibit signal from the receiver of the high-frequency apparatus does not occur and a signal is sent to the switch-off circuit from relay 1-3 of the power direction through an element of OR 4, an element of ZALRET 5, an element of 6 time delay for triggering 6, an element AND 7,

With the power direction relays, the faulty phases operate in the direction of a shutdown. The relay on the intact phase can operate in the blocking direction, if X 2 (equivalent resistances of the forward and reverse line sequences (AND systems) and the level of emergency components are sufficient for its operation. But in fact in the direction of shutdown, two out of three power direction relays are majority Or- gan 16 sends a signal to the prohibiting entry of the element BANCH 14 and as a result the blocking-signal does not pass. The signal goes to the switch-off circuit as described earlier.

It should be noted that since the device operates correctly and with three-phase short circuits, there are no additional organizations operating with three-phase short circuits, as compared with the known device, which simplifies the device implementation.

In case of short circuit in the OAPV cycle, operation of the device in the direction of shutdown occurs in a similar way.

With external faults, the device operates as follows.

At the closest to the short-circuit location, the protection set of at least two power direction relays work in the direction of blocking, the power relays in the direction of shutdown do not work. As a result, from the blocking relays through the element OR 12, the element BANCH 14, the element 15 at the time delay, and the return occurs the transmitter of the high-frequency apparatus. .

At the remote end of the overhead line, although the power direction relays are triggered in the direction of disconnection S, but as the blocking signal comes, then the output of the receiver of the high-frequency apparatus prevents the passage of the signal in the disconnect channel to

element BAN 5. The device does not fail.

The device operates similarly in the OAIIB cycle with external K3. The operation of the device for RF protection with a short circuit in the swing cycle is no different from the operation with a short-circuit in a full-phase network.

Thus, this device provides reliable disconnection of overhead lines in the event of a short circuit on it in all its modes of operation, including in the OAPV cycle and during oscillations.

Claims (1)

Invention Formula Device for high-frequency power line protection, containing two power direction relays working in the direction of shutdown and blocking, respectively, two BAN elements, the trigger time element, AND element, the return time delay element, prohibiting the input of the first BAN element connected to the receiver of the high-frequency apparatus , and the output is connected to the time delay element at,. operation, characterized in that, in order to increase the reliability of operation, four power direction relays are additionally added to it, every two of which work in the direction of shutdown 0 five And interlocking respectively, two three-input OR elements, a major authority, a starting body and a second return time delay element, with the outputs of the three power direction relays operating in the shutdown direction connected to the inputs of the first three-input element OR whose output is connected to the control input of the element BAN, the outputs of the three power direction relays operating in the blocking direction, are connected to the inputs of the second three-input element OR, the output of which is connected to the control input of the second element BAN, the output of which is connected to the return time latch element, the output of which is connected to the high-frequency transmitter start-up unit, the prohibiting input of the BANCH element is connected to the output of the main unit, the inputs of which are connected to the outputs of the three power direction relays operating in the off side, the inputs of the triggering organ are connected to the terminals for connection with the protected line, and the output through the second return time element is connected to one input of the I element, to the other input of which the output of the jumper is connected time to trigger, and the output element And is connected to the output body. 0 0