SU1015462A1 - Device for automatic reconnection for automatics of advancing division of mains - Google Patents

Abstract

THE DEVICE OF THE YVGOMATIC REPEATED SWITCHING ON AUTOMATICS. A TRANSFERRING DIVISION OF THE NETWORK has a current relay that controls the current in each phase connected to the busbar tires. the outputs of the current relay installed in the same-named phases are connected to the inputs of the first, second and third logic elements OR, respectively, a voltage control unit, a synchronism control unit, a delayed time element, and a command generation unit for activating the sectionalizing switch , so that with the aim of increasing the reliability and efficiency of automatic reclosing, the second one was additionally introduced. time element with delay for return, first and second logical elements AND, logical element AND-NOT, logical element NOT, fourth and fifth: logical elements OR and limited Tejib pulses, forming a short pulse on the front-edge of the input signal, and the outputs of the first, second and the third logical elements of the NUT are connected respectively to the inputs of the fourth logical element OR and the logical element NAND, AND: the axis of the fourth logical element OR through the time element with a delay in triggering the connection to the first input of the first AND gate, which is connected to v1hod command generating unit .On reclosing sectionalizing switch, and the output of the logical AND-NO element is connected to a first input of said fifth logic e51ementa SHI directly and through serially connected NAND gate, limiter them; Pulsg ,, time element with a delay for return - to the first input of the second logical element I, the second input of which is connected to the control unit (Voltage and output - to the second input of the fifth logical element. OR connected by the third input to the synchronism control unit , and vyksyum-K the second input of the first logic element I.

Description

The invention relates to electrical / engineering, namely, relay protection and automation of electrical networks. Auto-reclosing (AR) devices are known, which contain various combinations of single-phase AR (OAP1), three-phase AC with voltage and synchronism control, and fast AR (BAPV). The disadvantage of these devices is that they do not logically combine with the advanced division automation. networks and, accordingly, cannot be used in networks where this kind of automation is used. Closest to the present invention is a device for automatically re-enabling transmission lines with high-frequency and cutting protection, comprising an OAPV unit and a dual automatic reclosing unit with synchronization and no counter-voltage testing and a BPSU unit connected to the output of the BPSO starting and blocking unit. with logical elements OR, BAN, elements of temporary memory (VP) and element of time (c) with a delay for operation. The outputs of the speed of the low-frequency protection II of the slow-acting backup protection are connected to the inputs of the first and second elements of the OR and the inputs of the OAPV block, respectively, and the outputs of the protection to turn off the phases are connected to; the second inputs of the OR elements, the output of the first element OR / through the BAN element and the first element of the VI connected to the enable input of the high-speed three-phase LAP, and through element B, the third element OR and the second element of the VI output of the first element OR, and the second input of the third element OR is connected to the output of the second element OR 2. If the partitioning switch is disconnected by the automatic network advanced division (AOLS) switch with close faults on any of the connections connected to the buses, then when performing its automatic reclosing in accordance with the prototype, communication with the high-frequency and backup protection of all connections is required, resulting in the reliability of a known device - is insufficient. The disadvantage of the prototype is also the possibility of asynchronous activation of the connection when the high-frequency protection is slowed down, but when it is triggered to backup protection. In addition, the well-known device® prohibits BHAP in all cases; according to the condition of maintaining the dynamic stability value. especially taking into account the tendency to increase the speed of backup protection. The purpose of the invention is to increase the reliability and efficiency of automatic reclosing. This goal is achieved by the fact that in the automatic reclosing device for automatic advance network dividing, which contains high-speed current relays that control the current in each phase of the connections connected to the buses, the current relay codes installed in the same phases are connected to the inputs of the first, second and third stages. logical elements OR, respectively, voltage control unit, synchronism control unit, element ..; delayed response time and xjlanda formation unit for re-activation of the sectioning switch; additionally, an element of time with a return delay, the first and second logical elements are introduced I. the logical element NAND, the logical element NOT, the fourth and fifth logical elements pulses, forming a short pulse on the leading edge of the input signal, with 5 outputs of the first, second and third logical elements OR are connected respectively to the inputs of the fourth logical element the OR of the logic element, the output of the fourth logic element OR, through the time element with a response delay, is connected to the nepBOjy input of the first logical element AND, the output of which is connected to the unit for generating the command for restarting the sectioning switch, and the output NOT connected to the first input of the fifth logical element OR indirectly and through the series-connected logical element NOT, pulse limiter, time delayed element, return to the first input The second logical element I, the second input of which is connected to the voltage control unit, and the output to the second input of the OR logical element connected to the synchronization control unit by the third input, and the output to the second input of the first logical element I. The drawing shows device schema. The device contains high-speed current relays 1–3 installed in the phases of AgB and C connected to the busbars of the connections (N is the number of connections), the control unit 4 of the voltage control

on tires, control unit 5 synchronism of parts of the power system divided by sectioning switch, first second second 7, third 8 and fourth 9 "logical elements OR, time tO element with a response delay, first logical element 11, logical AND 12, HB 13 logic element, 14 pulse limiter, forming a short pulse along the leading edge of the signal, time return element 15 with delay for return, second AND 16 logic element, logical OR element 17 and block 18 fbiriro ktandy on repeated section BID switch

When one of the connections of a short-circuit with a current occurs, exceeding the breaking capacity of this switch of the G1r11 connection, there is a bout; Next, turn off the cut-off connection with its switch.

The device that produces the automatic reclosing of an automatic ignition device (1 ;;

When one of the current relays 1-3 is triggered, the signal passes through the “Southic elements SH-6-9 to the input of the element 10, with a delay of, Tripping. At a time, this signal arrives at the inputs of the logical element IS-NOT 12, at the input of which a signal of the logical unit of HF1 is played, if the non-signal of the signal is at one of its inputs.

For asymmetrical short-circuits at the output of the element 12, 1 is formed, which through the element 17 enters: the second input of the AND 11 logic element. After a time specified by the setting of the element 10, the permitting signal arrives at block 18.

In block 18, a number of other conditions are checked, unsampled to produce automatic reclosing, such as having sufficient air pressure in the air circuit breaker actuators. Position switch. The sectioning switch is disconnected, and the automatic reclosing is provided once. When performing the necessary skills and the presence of a paspetoanmero signal From ele-tena 11 18, the command is sent to re-turn on the sectional switch. The command on the automatic reclosure is then sent without checking for synchronization, as in this case, the stability of the power systems after dividing is provided by communication for the remaining intact phases.

With three-phase faults, current relays are triggered in all phases of one of the rice connections. As a result, the signal at the output of the element 12 forms the O signal. Then the signal is inverted at the element 13, its duration is limited at the limiter 14 and the time element 15 starts up, at the output of which Signal 1 is maintained for a predetermined time. If a signal from the voltage control unit 4 is received before this time elapses, element 16 is activated and the signal passes through unit 17 to the second input of element 11. Next, subject to the triggering ment 10, the destructive signal passes to block 18.

The delay time set at block 10 is determined by the method of performing the automatic reclosure of the damaged connection:

- if the automatic reclosure is first performed on the absence of voltage from the remote side of the short-circuit side, and then close to the short-circuit point, the switch is turned on with voltage control and synchronism, then the setting of element 10 is selected as far as possible from the detuning condition. interference (1-2 ms);

- if the sequence of operations in the production of automatic reclosing is reversed, then the partitioning switch must remain off for the entire time of automatic reclosing

damaged attachment.

The delay time for the falling out of the element 15 is calculated according to the condition of preserving the dynamic stability so that the switching angle does not exceed the permissible value (70-90 °

If the three-phase short circuit was disconnected during a time exceeding the set point of element 5, then a signal from the synchronization control unit 5 is necessary for the automatic reclosure.

Thus, in the device for generating the signal for enabling the automatic reclosing of a sectionalizing switch, communication with the main switch and backup protectors of the connection hooks is not required, resulting in increased stability of the device: Automatic reclosure.

The application of the proposed device allows to increase the speed of automatic reclosing in case of symmetrical short circuits, and also to exclude the cases of joining of asynchronously operating parts of the power system.

t The effectiveness of the invention is -.

the fact that the increase in reliable, and the speed of the automatic reclosure leads to K; reduction of electric power losses during liquidation of emergency conditions, and increase in the quality of consumers' electricity supply.

Claims (1)

AUTOMATIC REPEATED DEVICE OF J AUTOMATIC OF FORWARD ADVANCED DIVISION OF THE NETWORK, containing high-speed current relays that monitor the current in each phase of the connected busbars. moreover, the outputs of the current relays installed in the same phases are connected to the inputs of the first, second, and third logical elements OR, respectively, the voltage control unit, the synchronism control unit, the time element with a delay for operation and the unit for generating a command to restart the sectioning switch, o Lich t w o f e c i 'the fact that, in order to increase the reliability and efficiency of the circuit-reclosing additional ² · tion introduced vtoroy.element time delay for a refund, the first and second logic email the AND gate, the AND gate, the NOT gate, the fourth and fifth OR gates, and a pulse limiter that generates a short pulse along the front edge of the input signal, the outputs of the first, second, and third IDN gates being connected respectively to the inputs of the fourth OR gate and AND gate, AND, the output of the fourth gate OR through the time element with a delay in response is connected to the first input of the first logic gate AND, the output of which is connected to bl by the formation of the command to restart the sectioning switch, and the output of the AND gate is AND connected to the first input of the fifth logic gate OR directly and through the series-connected logic gate NOT, the pulse limiter, the time element with a delay to return to the first input of the second logic gate AND , the second input of which is connected to the control unit ₍ 'voltage, and the output to the second input of the fifth logic element. OR connected by the third input to the synchronism control unit, and by the output. To the second input of the first logical element I. \