SU936201A2 - Device for relay protection of sectionalized line with network redundancy from damage - Google Patents

Description

(5) DEVICE FOR RELAY PROTECTION AGAINST DAMAGE OF A SECTIONAL LINE WITH A NETWORK RESERVATION

The invention relates to electrical engineering and can be used on electric distribution networks of 6-35 kV that are partitioned with network redundancy lines. According to the main author. St. i, a device DG1 of relay protection against damage to partitioned line backup with network redundancy is known; it contains series-connected current control, current protection unit and executing body, as well as series-connected voltage control, voltage recovery latching unit before automatic switch-on AVR reserve and the switch unit of the settings connected to the second input of the protection unit 1. However, the reliability and stability of this device is insufficient. The purpose of the invention is higher improving the reliability of the device. The goal is achieved by the addition of a standby voltage control unit, a standby voltage block, a standby voltage block, a standby voltage block, and an emergency shutdown block to the relay protection device against damage to a partitioned line with network redundancy. the first input of the emergency shutdown latching unit is connected via the latching unit of the presence of voltage of the normal mode to the output of the normal mode control body, the second input is to the second, the output of the latching unit of the successful automatic switching on of the reserve, the third input through the successively connected latching unit, the absence of voltage of the backup mode and the control unit of the voltage of the backup mode are connected to the controlled executive circuit, and the output is connected to the second input of the executive. The drawing shows a schematic diagram of the proposed device. The device contains: a current control body 1, made on measuring current transformers 2; current protection unit 3 including a current relay of the first k and second 5 stages; time relay 6 and intermediate relay 7; normal voltage control authority 8; a block 9 for fixing voltage recovery to ABP; block 10 commit successful AVR; block 11 fixing unsuccessful AVR; a setting switching unit 12, consisting of a normal mode setting point element 13 and a setting element 1 in a mode after ABPj, a standby mode voltage monitoring unit V5; latching unit 1, the absence of voltage of the backup mode, the emergency shutdown latching unit 17, the latching unit 18, the presence of the voltage of the normal mode, the executive body 19 1, the switch). The device works as follows., Original mode. When the operating current passes through the current control unit 1, the signal removed from the measuring current transformers 2 enters the current protection unit 3 and since the current is lower than the current of the first 4 and second 5 stage relays, the actuator 19 does not operate. If there is damage to the current relay of the first stage or the current relay 5 of the second stage (depending on the magnitude of the current damage), the current relay 4 of the first stage acts through the intermediate relay 7 to switch off the switch without slowing down, and the current relay 5 to the second stage with a delay time performed on time relay 6. When the voltage disappears on the line, the voltage monitoring body 8 removes the signal from blocks 9, 10, 11 and 18 of the latching of the voltage recovery to the ATS, fixing a successful A of the unsuccessful ATS and fixing the presence etc. Normal mode voltage. The first time the voltage is restored in a time shorter than the network AVR, the block 9 of the clamping of the voltage recovery to the AVR is triggered. At the same time, the input to the setting element 13 of the normal mode setting unit of the set switching unit 12 is given a signal corresponding to the position of the current stage settings k of the first stage, the current stage 5 of the second stage in normal mode. When the voltage recovers within the time corresponding to the successful ATS, the successful ATS lock-on unit 10 is activated and sends a signal to the input of the setting element 1g of the settings in the mode after the ATS of the setting switching unit 12, corresponding to the position of the current 4 settings of the first and the second current of the second stage successful AVR. If there is no voltage on the voltage line longer than the time of successful AVR, the block 11 fails to fix the failed AVR and feeds the input of the setting element 13 of the normal mode of the switching unit 12 to the settings corresponding to the position of the current relay settings k first and 5 second steps in normal mode. Blocks 9.10, 11, and 12 fixations of voltage recovery to automatic load transfer, fixing of successful load transfer, fixing are not. ATS, switching settings and latching blocks 16, T8 and 15, the absence of standby mode voltage, the presence of normal mode voltage, and the standby mode voltage control unit can be performed using a time relay and two intermediate relays. If successful, the ATS connected, for example, with a short circuit in the line section, the voltage of which is controlled by the normal-voltage control body 8, the executive authority 19 is disconnected from the relay protection and maintains the disconnected position as long as there is a voltage from The standby voltage monitoring body 15 is absent from the normal mode voltage control body 8. After the cause of the emergency shutdown of the executive body 19 is eliminated, the personnel are energized ganna 8 is a normal mode voltage control, which is information about the elimination of a short circuit, and is removed from the side of block 15

control of backup mode increase.

These switchings can be made from the place of installation of the line head switches. In this case, the first and third inputs of the emergency shutdown latching unit 17 receive signals from the latching unit 18 of the normal mode voltage and the latching unit 16 without the reserve mode voltage. The signal from the fixing unit 10 of a successful emergency transfer switch at the second input of the emergency shutdown fixing unit 17 in the successful emergency transfer mode is constantly on duty. If there is an emergency shutdown lockout on the inputs of all three signals at the same time, a signal appears on the output of the emergency shutdown lock block 17 that acts to turn on the control panel JQ 19. power supply, then at the input of the emergency shutdown latch block 17 there is only a signal from the block 75

18fixing the presence of normal-mode voltage.

. Turn on executive body

19 does not occur. Such an operation of the device is correct, since there is no information on the elimination of short circuits in the line section to which the voltage control unit 15 is connected. Circuits for automatic re-activation of the actuator are not included in the device.

Thus, the proposed device responds correctly in any line mode that occurs during the operation of automation equipment, which increases

reliability of energy supply to the consumer.

Claims (1)

1. USSR author's certificate No. 7Q2kS7, kp. H 02 H 7/26, 1978.