SU989670A2 - Device for releiving electric main region - Google Patents

Description

The invention relates to the field of automation of electrical networks.

According to the main author. St. No. 656142 a device for unloading is known, the area of the electrical network with switches at the power end of the line and at the receiving substation, which contains the emergency control command unit and the shutdown unit at the pit end of the line, and the damage fixing unit and the load disconnecting unit at the receiving substation. , on. the power end of the line is an unloading unit having several stages, a power recovery unit and powering on lines, the inputs of the power unloading and power restoration units are connected to the command unit, and their outputs are connected to the shutdown and activation inputs, and -, power supply lines, at the receiving substation - unloading and starting blocks, made with disconnection according to the number of unloading stages, blocks of frequency reduction, voltage occurrence, power recovery and load switching, and inputs this frequency blocks and reduce the occurrence of voltage intended for connection to the voltage pitakntsey lines, and their outputs are connected to inputs of all the blocks and unloading stages voechtanovleni power whose outputs. connected, respectively, to the inputs of the disconnecting and switching on load units, the outputs of the latter being degraded or connected to the switches of the receiving substation 1.

fO

A disadvantage of the known device is that if; transfer command to unload, the command device issues a new command; to a higher level, the device may fail or act incorrectly, depending on the moment the second command arrives.

The purpose of the invention is to improve the reliability of power supply.

20

The goal is achieved by the fact that in the device for unloading the area of the electrical network, the outputs of each stage of the discharge unit are connected to all the upper stages of this

25 blocks, an additional unit of a repeated unloading command, having the same steps as the unloading block (except for the first one), was also introduced, while the inputs and outputs of each step of the block

30 reloading command. CompoundKb .1y, respectively, with the output and the same and all junior stu-f pen unloading block, in addition, the inputs of all stages of the unloading block and the repeated unloading command are associated with the switch-on unit. Not a drawing representing the fuctional scheme of the device. The device consists of command and control automated control unit 2 placed on the pit-substation 1 of the substation, which serves to issue short-term commands for unloading and restoring power to consumers, block 3 unloading with different unloading stages and glint 4 of restoring power to consumers to form commands for switching off the switches power lines 5, through block 6 of disconnection and their reverse switching on through block 7 of switching on with different intervals between switching off and on depending on the number of steps and unloading or transmitted, at a power recovery command of the user. At the receiving end of lines 5, the device 4- i d6 contains a voltage transformer 8 connected to the power line 5, starting blocks 9 for unloading according to the number of stages of unloading and starting block 10 for restoring the power consumption of service stations for fixing the duration of power interruption of the substations 11 and allowing operation of the corresponding block 12 disconnecting the load or switching on the load unit 13 only in the vicinity of the fixed power interruption time lag, block 14 on the occurrence of a voltage serving for. fixing the fact and duration of voltage on supply line 5 and increasing the selectivity of operation of starting blocks 9 and 10. Block 14 does not detect short-term voltage on line 5, for example, for less than 0.2 s with unsuccessful reclosing and high-speed operation protection of the line and allows the starting blocks 9 and 10 to work on the blocks 12 shutdown and 13 on for a short time, for example, 0.1 s. In addition, the device includes a transformer on the yarn 15 connected to the busbars of the substation 11 and used to power the damage fixing unit 16 and the frequency decreasing unit 17. Damage latching unit 16 serves to block the AR cycle time of the power supply line of the load disconnecting unit 12 and the load switching unit 13 when the power supply 5 is disconnected due to its damage. The frequency decreasing unit 17 serves to accelerate the start-up of the starting units 9 and 10 when the frequency decreases in cases where, after the supply to the line 5 is disconnected, the voltage is kept on, for example, by synchronous motors that are part of the load 18 and 19. A unit 20 of a second unloading command, consisting of the same steps as the unloading unit 3, except for the first one, has been entered into the device. Each station level of the unloading repeated command block 20 is used to fix the signal of a given stage of the unloading unit during the execution of the turn on signal of line 5 and to issue a repeated signal to the augg of this stage. Additional links of steps of the 3 L unloading unit are used to start the countdown of time for all senior stages (ipH) to give commands to any stage except the Nth, and the time of the highest stage from the emergency automation from the command unit 2 .to disconnect power supply line 5 and a signal to turn it on. The device works as follows. When conditions arise for the operation of an emergency control system at one of the unloading stages, for example, at the first stage, the command control unit 2 of the emergency control system issues a short-term signal to trigger the first stage of the unloading unit 3. When this happens, the power supply switch 5 is disconnected and the time delay of all steps from the second to the Nth begins. At the same time, all the subsequent (from the 2nd to the Nth) steps of the command command 20 are prepared. If occurrences of the signal, on the reverse switch off: I, i.e. Before the activation of the switch-on unit 7, conditions arise for the response of the command unit 2 of the emergency control automation to one or the other. several senior stages, for example, the second and third, then the highest of the current stages of the discharge unit 3 (one third) through the previously prepared for work; the third stage of the unit 20 of the second discharge command stops counting the time of all the lower stages and with a time delay fixed for the third stage of unloading through the switch unit 7, it gives a signal to turn on the switch pi; The operation of the device at the receiving substation 11. is carried out in the same way as at the feeding substation 1, and the discharge of the third stage takes place. The device also works when a signal is simultaneously applied to several stages of the 3 p & load unit.

The eldest of the received signals — the block of unloading block 3 blocks, through its level of block 20, of the repeated unloading command, all the lower stages, and the unloading command is executed at the upper level.

When a signal arrives at the old stage of block 3: unloading during block 7 on operation, the signal to enter the switch of the pitachtsey line .5 is not interrupted by one of the first steps, because the on block 7 for the time of its operation breaks: turns on the circuit to open the switch supply line 5.

All the half-emitted signal of the block 3 unload stage acts on the corresponding 4 stages of the block 20 of the repeated command. The older of these steps triggers, blocks the rest of the forbidden steps and through spet m, the longer the operation time of the T-switch block g, issues a repeated command to the appropriate upper step of the unloading block 3., i.e. first, the command / which issued the command is executed, cdma: I have to turn on the power supply switch 5, and then the command is transmitted to the highest of the stages, which were drunk at the time of completion of the previous command. Thus, the device offered by the device provides transmission to the control unit and the upper stage of unloading (at whatever time it arrives) simultaneously with the command and the lower stages during the signal transmission process or at the time of issuing the command to turn on the power supply cable.

Claims (1)

Invention Formula The device for unloading the area of the electric set, according to the author. W656152, for example, in order to increase the reliability of the power supply, the outputs of each stage of the discharge unit are connected to all the upper stages of this block, and an additional unit of the second discharge command has the same steps, what. and the unloading unit (cream first), with ett, the inputs and outputs of each stage of the block of the second unloading command are connected respectively to the outputs and inputs of the same name and younger, and the different stages of the unloading unit, a. entrances of all stages of unloading blocks || and re-command sv alaai block on. Sources of information taken into account in the examinations of 1 USSR author's certificate 656152, cl. H 02 J 3/24, 1979. 5 3