SU1022259A1 - Device for monitoring emergency disconnection of sectionalizing apparatus - Google Patents

Abstract

A DEVICE FOR MONITORING THE EMERGENCY STOP OF A SECTIONAL DEVICE, containing a short-circuit current sensor, two MEMORY logic elements, two AND logic elements, an INVERSION element, a display unit and a serially connected delay element and a reset unit, the output of the short-circuit current sensor is connected to the first logic element the MEMORY element and the INVERSION element, the outputs of which are connected through a serially connected first logic element AND and the second logic element MEMORY with one of the inputs of the logic element AND, characterized in that, in order to expand the functionality of the device by monitoring the health of the sectioning apparatuses and increasing the accuracy in determining the distance to the short circuit place, it is equipped with a fixing impulse unit, a time measuring unit, a logic unit and memory unit, while the short-circuit current sensor is connected to another input of the second logic element And and the input) of the siruing pulse unit, the output of which is connected to one of the inputs of the logic unit connected to the storage unit, and the digital inputs of the logic unit through the time measurement unit S are connected to the output of the second logical element I, the output of the logic unit being connected to the input of the information display unit through the delay element. you to cl with

Description

The invention relates to a process design and can be used to obtain information about the damaged area and the state of the switching equipment of a partitioned power supply line.

A device for telecontrol of the position of sectionalizing switches of power lines, containing one-vibrators, zero-indicators, time-delaying organs, current organs, indicating relay, is known;

.the purpose of increasing reliability in it

links with different time constants are applied, inputs 1–1 are connected to a source of operational voltage through a single-oscillator reacting to a short-circuit current drop, and their outputs are connected to a pointer relay via null indicators and a matching circuit, the second element of which is connected to a logic element I, moreover, a one-shot vibrator is connected to one of its inputs, which reacts to an increase in the current of the automatic reclosing cycle (AR), and to another input - an overcurrent organ that fixes the failure of ARA tH.

A disadvantage of the known device is that, due to the use of capacitors, an error is introduced in the measurement of the duration of the signals, which necessitates the establishment of a significant difference in the time settings of the auto-reclosing sectioning apparatus. This leads to an increase in the duration of dead time and affects the reliability of power supply. In addition, a C-link is provided for each sectioning device, which, as the number of controlled sectioning devices increases, complicates the device.

A device that implements an emergency shutdown signaling method and contains a current transformer installed on a monitored line, to which a harmonic current filter and current triggering device are connected to the inputs of the block implementing the logical operation NO, memory block and circuit, are connected to the device. NOT. In addition, the device contains two time delay organs, a comparison unit, a memory unit with a short time delay determined by the delay circuit, and a matching circuit 2.

A disadvantage of this device is the low reliability and the impossibility of unambiguously determining the number of the emergency disconnecting partitioning apparatus.

It is also known a device for monitoring emergency shutdowns of sectioning apparatuses, comprising a short curly current sensor, two logic elements MEMORY, two logical elements AND, an element INVERSION, an information display unit and serially connected delay elements a reset unit, the output of the short circuit current sensor being connected to the inputs of the first of the MEMORY logic element and the INVERSION element whose outputs are connected through the first AND logic element connected in series and the second logic element MEMORY with one of the inputs of the second logic element I. In addition, the device contains two logical elements OR, another INVERSION ment and three logical elements AND, a BAN element, a rectifier bridge, a pulse shaper, three recalculating trigger decades and three diodes .. matrices t3l time.

The disadvantage of the known device

0 is that during a short circuit occurring after the sectioning device and a failure of this device, the damaged part of the line is disconnected by the pre-switched device, in this case, with a stable short circuit, the device records the ALP time of the device that made the shutdown. It is not possible to identify the failed

0 device and reliably determine the damaged area, since the length of the partitioned areas can reach tens of kilometers, therefore, the time to locate and localize the damage site and, as a result, the duration of the emergency shutdown of consumers is at least doubled.

The purpose of the invention is the expansion

. device functionality

ABOUT

 Wah by monitoring the health of sectioning machines and increasing the reliability in determining the distance to the short circuit. The goal is achieved

5 in that a device comprising a short-circuit current sensor, two MEMORY logic elements, two AND logic elements, an INVERSION element, an information display unit and successively connected delay elements and a reset unit, the output of the short-circuit current sensor connected to the inputs of the first logic element MEMORY and INVERSION element,

j the output of which is connected through a serially connected first logic element I and the second logic element MEMORY with one of the inputs of the second logic element I, is provided with a fixing impulse unit,

 a time measurement unit, a logic unit and a storage unit, while the short-ended current sensor is connected to another input of the second logical element AND and the input of the fixing impulse unit whose output is connected to one of the inputs of the logical unit connected to the memory unit and The logical block drones are connected to the output of the second logic element I through the time measurement unit, and the output of the logic unit is connected to the input of the information display unit through a delay element. The drawing shows a variant of the block diagram that implements the proposed device. The control device for emergency shutdowns of sectioning devices contains a short-circuit current sensor 1 for kykani, the KOTOpoifo output is connected to the input of a MEMORY logic element, made in the form of a trigger 2, to the input of the INVERSION element 3, to the input of a fixing pulse device 4 to one of the logic element 5 AND inputs The outputs of trigger 2 and element 3 INVERSION are connected with the corresponding inputs of logic element 6 AND, the output of which through another logical element MEMORY, made in the form of trigger 7, is connected to the second input of logic a Item 5 I. The output of the logic element 5 through the time measurement unit 8, which can be used as a timer, is connected to the digital inputs of the logic unit 9, which performs the function of analyzing the information arriving at its inputs and comparing this information with the calculated values short-circuit currents and turn-off time of damaged sections of a partitioned line. In addition, the logic unit is connected to the storage device 1, one of the inputs of the unit 9 is connected to the fixing pulse device 4, and the output through the delay element 11 is connected to the information display unit 12 and the reset unit 13. The most expedient implementation of the proposed device with the help of a ukkro-computer. The device works as follows. As a rule for protection against k. at the beginning of the power supply line and sectioning devices are used with maximum current protection. Head and sectioning devices have single-action reclosing devices. In case of a short circuit on one of the sections of the sectioned power supply line, the inrush of the short aamkani is detected by sensor 1. The signal from its output enters the input of element 3 INVERSION and from this signal triggers a trigger and outputs a signal to the corresponding input of logic element 6 I. Until the first current surge disappears short circuit signal at the output of the element 3 INVERSION, and consequently, at the other input of the element 6 is absent. Logic element 6 And does not work, and the signal to the input of block 8 is not measured. At the same time, the signal from the output of the short-circuit current sensor 1 is fed to the input of the fixing pulse unit 4, which converts the magnitude of the short-circuit current to the corresponding number of pulses that arrive at the input of the logic unit 9. The block 9 selects the distance to this number of pulses from the storage element 10 short circuit locations. But the signal is not yet received at the input of the information display unit 12 until the delay element 11 is triggered (the delay time of element 11 is chosen somewhat longer than the time of the full cycle of automatic reclosing of sectioning devices). With the disappearance of the first inrush current short circuit, a signal appears at the output of the element 3 Inversion. This signal is fed to the second input of the logic element 6 And, the first input of which receives a signal from the output of the trigger 2. The element 6 is triggered and the signal from its output through the trigger 7 is fed to one of the inputs - the logic element 6 And, at the other input of which disappears the first current surge is absent. Therefore, the signal is on. the input of the time measurement unit 8 is not received again. When self-destructing a short-circuit (unstable, h.), A successful switching-on of the corresponding sectioning device takes place through the time of automatic reclosing. But after a time slightly longer than the full time of the automatic reclosing cycle, a delay element 11 is triggered and the signal from the output of block 9 arrives at the information display unit 12, which gives the serving personnel information about the distance to the site, damage and the nature of the short circuit - in this case unstable 3. At the same time, the signal from the delay element 11 is fed to the input of the reset unit 13 and the circuit returns to the initial state. Receiving information about the unstable, 3. allows you to organize a timely inspection of the line and prevent the transition of an unstable short circuit to sustainable. With a stable short signal, the device operates as described above, but after the reclose cycle, a second inrush current occurs, which is second detected by current sensor 1, and a signal appears at the second input of logic element 5 And the signal at the first input of element 5 is wired after the disappearance of the first current surge k. 3.). Logic element 5 is triggered and the signal is fed to the input of time measuring unit 8, which determines the time of disconnection of the damaged area by the duration of the second inrush current, co. and generates a corresponding signal (II-bit code), which is fed to the digital inputs of logic unit 9. In this block, the magnitude of the short-circuit current received from block 4 is compared with the calculated values of the two-phase short-circuit currents at the beginning and end of each partitioned section of the transmission line, which were embedded in the storage device 10. Thus, the logic unit 9 determines the number of the damaged section, and accordingly selects from the storage device 10 The maximum current protection of the sectioning device, the switching section of the corresponding section, is triggered. Then, block 9 correlates the recorded time of disconnection of the damaged area with the time of operation of the maximum current protection. If these values coincide, a conclusion is drawn about the emergency shutdown of the sectioning apparatus, in the case of a discrepancy - about its failure. After that, the signal arrives at the information display unit 12 and contains information about the distance to the short-haul. about the nature of the short circuit (resistant to e and emergency shutdown of the sectioning device and in case of failure - about the failure of the relevant sectioning device. Thus, compared with the known proposed device by monitoring the health of the sectioning device and determining the distance to the short circuit It has enhanced functionality by them. The following units and blocks are used in the model of the proposed device for controlling emergency shutdowns of sectioning apparatuses: block 4 A pulsing device of the FIP type, block 8 — time measuring block, micro-computer timer, used to form and measure time intervals, consists of a four-bit counter, an installation register, a comparison circuit, a code reading circuit from a counter; logical block 9 includes a microprocessor, the input-output unit and the address-information bus; the information display unit 12 — is made using a telegraph apparatus or a Kvant-M type video control display device. It is possible to use microcomputers of any type, which have hardware and software to support I / O tasks, in the device for controlling emergency shutdowns of sectioning apparatuses. However, remote signaling devices are characterized by high capital and operating costs, which are often comparable to the costs of building and operating the distribution network itself. In addition, when using the base object, it is not possible to obtain information about the failure of the partitioning apparatus and the location of the cross section. By comparison with the base object, the proposed device allows monitoring the operability of sectioning apparatuses, more accurately determines the distance to the short circuit, quickly determines the nature of the short circuit, which significantly reduces the emergency undersupply of electricity, increases the reliability of work in general, reduces power losses and reduce labor costs to bypass the line when detecting possible damage.

Claims (1)

DEVICE FOR EMERGENCY CONTROL OF A SECTIONAL EQUIPMENT, comprising a short-circuit current sensor, two MEMORY logic elements, two logical elements AND, an INVERSION element, an information display unit and a delay element and a reset unit connected in series, the output of the short-circuit current sensor being connected to the input of the first logical circuit the MEMORY element and the INVER element SIA, the outputs of which are connected through series-connected the first logical element AND and the second logical element MEMORY with one of the inputs of the logical element And, characterized in that, in order to expand the functionality of the device by monitoring the health of the partitioning devices and increasing the reliability in determining the distance to the short circuit, it is equipped with a fixing pulse unit, a time measuring unit, a logic unit and a storage unit, while the short-circuit current sensor with connected to the other input of the second $ logical element AND and the input of the fixing pulse block, the output of which is connected to one of the inputs of the logical block connected to the storage unit, and the “digital inputs of the logical block through the time measuring unit are connected to the output of the second logical element And, and the output a logical unit through a delay element is connected to the input of the information display unit. 102225 CO>