SU1086493A1 - Device for adaptive single-phase auto-reclosing of electric power line - Google Patents

Abstract

1. ADAPTIVE SINGLE-PHASE AUTOMATIC REPEATED ELECTRICAL TRANSMISSION LINE, containing an electoral unit, a selective unit, a sequential deionization time delay unit and a deactivated phase switching unit, connected in series, a current-time block of the current-free pause and an object block, and an object with a timeout block of the current-time pause unit and the body of the current-time pause block and the body of the current-time pause block and the unit, the current-time block of the current-time pause and the body of the current-time pause unit and the disconnected time block of the current-time pause unit and the body of the current-time pause unit and the tween block and the body of the current-time pause block, and the body of the current-time pause unit and the body of the current-time pause unit and the unit of the time-free pause unit and the body of the time block during the timeout block and the body of the time block and the body, the body, the current time of the object, the object, the body, the current time of the current object, and the tempo increase the noise immunity of the device and the accuracy of its operation; a pulse generator, a trigger and a single-phase resolution block are introduced into it In addition, the automatic deactivation time delay block is made of the first pulse counter and the deionization time element associated with its output, and the dead time delay time delay block of the second pulse counter and its element output setting the dead time, the first output of the selective block is connected to the input of the pulse generator, the output of which is connected to the counting inputs of the first and second pulse counters, the second output is The unit is connected to the second input of the on-off switches of the disconnected phase and to the first input of the single-Q phase auto-reclosing permission block whose output is connected (L to the second input of the reference element with the deionization time duration, the third input of which is connected to current-free pause, the second input of which is connected to the output of the element for setting the duration of deionization time, and the output of the selective unit (connected to the input of the zero setting 4 of the first counter pulses and to: o the trigger input, the output of which is connected to the second input of the single-phase resolution auto-reset unit 00 is turned on. 2. The device according to claim 1, about tl and so that the selective unit is made of a threshold element, a third pulse counter, two pulse shapers and a logic element, And, the input of the threshold element is connected to the input terminal of the device, and the output to the counting the entrance of the third counter to them

Description

pulses and the input of the first pulse maker, whose bosa is connected to the input of the second pulse maker and the first input of the logical element I, the second input of which is connected to the output of the third pulse counter, and the output of the second pulse maker is connected to the third pulse counter.

one

The invention relates to electrical engineering, in particular, to relay protection and automation of power systems, and can be used for high voltage transmission lines equipped with high-frequency communication channels.

A device for single-phase automatic reclosing of a power line is known, based on monitoring the moment of arc quenching by measuring the voltage of the beating on the disconnected phase during a current-free pause, containing a control unit for activating the switch of the damaged phase, block for activating the damaged phase with a jumper. time determined by the actual duration of the arc feeding. The output of the delay unit is connected to the input of the control unit by turning on the switch Cl.

However, this device is used only for power transmission lines with shunt reactors and requires the use of three sets of equipment (in the case, three measuring units), one in each phase.

The closest technical solution to the invention is an adaptive DLPA device with monitoring of arc charging time, which implements a single-phase automatic re-start of transmission, equipped with high-frequency communication channels, containing a single-phase automatic reclosing unit, an amplitude of the interference voltage amplitude, a deionisation relay and output relays for switching on breakers, as well as time-delayed relays connected in series and output relays for three-phase off Cheney, the unit consists of a single-phase reclosing.

connected in series to an electoral unit, an intermediate relay and a time relay; a noise voltage amplitude control unit — from a series-connected selective unit and a comparator unit, the second output of which is connected to the time relay's input without pause, and the second input of the selective unit is connected to the output high frequency communication channel C2.

The disadvantage of this technical solution is low noise immunity, due to the 15 control of impulse noise at the output of the high-frequency communication channel. only in amplitude, as well as a large error in the deioni-zadiye time and dead time settings. 0 The purpose of the invention is to increase the noise immunity of the device, as well as to improve the accuracy of its operation.

Delivered by the fact that the device is adaptive

3 single-phase automatic reclosing of the transmission line, containing a selective unit, selective unit, connected in series time delay unit deioni0 and switching on unit of disconnected phase switches, connected in series unit c) Dead time delay and three-phase disconnecting unit, impulse generator, trigger, trigger and the PELV resolution block, furthermore, the deionisadium time lag block is made of a first / pulse counter and a task element associated with its output is long deionization time, and the dead time block of the dead pause from the second pulse counter and the output element of the dead time pause associated with its output,

5 wherein the first output of the selective unit is connected to the input of the pulse generator, the output of which is connected to the counting inputs of the first and second pulse counters, the second output of the selective unit is connected to the second input of the switch-on unit of the disconnected phase switches and the first, input of the enablement unit OAPV, the output of which is connected to the second the input element of the task duration.time deionization, the third input of which is connected to the output of the element setting the duration of the dead time, the second input of which is connected to the output of the element specifying time deionization, and the selective output unit is connected to the zero setting input of the first pulse counter and to a single entry Trigg pa unit whose output is connected to the unit APA vtoromu.vhodu resolution. In addition, the selective element is made of a threshold element, the third pulse counter, two pulse formers and a logic element I, the input of the threshold element connected to the input terminal of the device, and the output. To the counting input of the third pulse counter and the input of the first pulse generator, the output of which is connected to the input of the second pulse generator and the first input of the logic element I, the second input of which is connected to the output of the third pulse counter, and the output of the second forming body of pulses is connected to input setting zero of the third pulse counter,. The drawing shows a block diagram of the device adaptive OAPV. The device contains a selective unit 1 consisting of a threshold element 2, a pulse counter 3, two pulse shapers (one-shot) 4 and 5, a logical element AND 6, a trigger 7, a resolution block ODPV 8, a deionization time block 9, consisting from the pulse counter 10 and the element for setting the duration of deionization time 11, the dead time block 12, the pulse counter 13 and the dead time generator 14, the pulse generator 15, the selective block 16, the switch-on switch off 17 chennoy phase and three-phase interrupting unit 18. The interference of the high-frequency communication channel and receives unit 1 ,. consisting of a threshold element 2 connected to a pulse counter 3 and a single vibrator 4, the output of which goes to a single vibrator 5, setting the zero of the pulse counter, and an input of a logic element 6, the second input of which is connected to the output of a counter 3. Output signal of unit 1 enters the single input of the trigger 7 connected to block 8 and to block 9 consisting of a pulse counter 10 and element 1J connected with its output, the second input of which receives a signal from block 8, and the third from block 12, consisting of a counter imp 13 and the pulse counter connected to its output. The pulse counters are triggered by the pulse generator 15, which begins to generate pulses at the signal of block 16, inputs A, B, C of which are connected to the block contacts of the same-phase switches, and the output enters the block 8 and the second input of block 17, the first input of which from the output of block 9 receives a signal simultaneously arriving at the second input of element 14. Block 12 outputs a signal to block 18 for three-phase disconnection of power lines, and block 17 signals to an active-phase network of the disconnected phase. The device works as follows. In the event of a short circuit of any one phase A, B, .C it is disconnected from. the blocking contact of the corresponding phase triggers the block 16, stores the disconnected phase and puts the device into the initial state (sets all the counters and the trigger to the zero position), while simultaneously starting the block 8. The counters start counting time from zero. The input of the selective block 1 receives impulse noise arising in the high-frequency communication channel with an arc short circuit in the form of a packet of pulses with a duration of intervals between them (packets) of approximately 10-20 ms, each of which contains higher-frequency pulses of a total duration of 1-1, 5 ms The threshold element 2, executed schematically in the form of a Schmitt trigger, performs amplitude selection of interference from another kind of interference and improves the front of the input signals. The first pulse of the arc noise packet triggers a one-shot 4, the duration of the output pulse of which is approximately 2 ms. Simultaneously, a packet of pulses is fed to the counting input of an electronic counter 3, which counts the number of pulses in a packet. If the number of pulses in a packet exceeds a given number n (n takes discrete values of 1, 2, 4, 8), i.e. during the duration of the output pulse of simultaneous 4 arrives the resolving potential from the output of counter 3 to the second input of the logic element 6, the latter will issue a signal Packet, which means that an arc short circuit takes place. Thus, the presence of counter 3 gives the selective unit 1, along with amplitude selectivity, also frequency selectivity, which in general increases the noise immunity of the device. The falling edge of the output pulse of the one-shot 4 starts the one-shot 5, the duration of the output pulse of which is approximately 50 microns, which returns to the initial state counter 3, preparing it to count the number of pulses of the second packet. The signal is stored by the trigger 7, its transfer to state 1, and, by means of a counter 10, which is an electronic binary-decimal pulse generator, which starts the time re-count from zero. When the SRI arrives at the input of the device of the second (and subsequent) pulse packet, the one-shot 4 is then started, then the one-shot 5, and the device operates in the same sequence, unless the interval between the pulse packets exceeds the time required to restore the dielectric strength (de-ionization) arc; anal sex In this case, the counter 10 each time measures the duration of the intervals between the packets of pulses, comparing it with the deionization time. The deionization time is digitally specified by element 11, which is a coincidence circuit, to the first four inputs of which information is supplied in a binary-decimal code from the outputs (single or zero) of the highest decimal digit of the electronic counter 10. The deionization time is: where T, the duration of the arc channel deionization; pulse generator frequency; the number of decimal digits of the counter is 10; the bit sequence number in the highest decimal digit of the counter 10; a factor of 0 or 1 depending on the state of the binary bit. If the burst stops for any reason (the arc goes out), then after the time T expires (since the counter 10 will no longer reset), counting from the last burst of pulses, the coincidence circuit 11, triggered off signal, turns off re-activates exactly the phase that block 16 remembers in the presence of a permissive signal from block 8. The latter generates an enable signal in the event of only one phase of disconnection (trigger 7 must be in state 1) and may not initiate signal - otherwise (disabled two phases, three phases or audio odng). This signal arrives at the second input of the coincidence circuit 11, resolving the OARS in a single-phase short-circuit and prohibiting it in a multiphase one. Thus, at the time of the command on the PAVC, the presence of a single-phase disconnection is once again additionally checked, thereby excluding the possibility of OAPV in the event that another one or two phases were disconnected during the operation of the device. Regardless of the presence of arc interference, the electronic counter 13 counts the dead time, which is also digitally set in binary form by the coincidence circuit 14 and adjusted. Similarly, the duration of the dead pause is calculated by the expression, .-- / where Tj is the duration of the dead current OAPV; f is the frequency of the pulse generator; q, is the number of decimal digits of the counter 13; i is the binary digit order number in the highest decimal digit of counter 13; B is a coefficient equal to 0 or 1 depending on the state of the binary bit. After the time T expires, from the moment the device starts operating, the coincidence circuit 14 operates, thus giving a command to block 18 for each phase disconnection of the overhead line, unless there have already been an OAPV, since in this case the three-phase disconnection is blocked by a signal. I, on the second input of the coincidence circuit 14 from element 11. B turn, the command for three-phase disconnection blocks the command on the AADO from the third input of element 11, if it (the command on the AADO) is in the formation stage, i.e. if the end of the nonstop pause falls into the deionization time interval. With a metallic short circuit, arc interference (pulse packets) in the high-frequency communication channel is absent, and trigger 7 remains in. the initial state, prohibiting the generation of an enabling signal by the block 8 on the automatic system. In this case, the three-phase disconnection of the overhead line at the end of the dead time, i.e. after the time Tg. The three-phase disconnection delay in this case (although it is possible to disconnect earlier) is due to the fact that the percentage of metal faults is rather small and, moreover, it is not improbable that the metal short circuit can turn into an arc with a subsequent successful PADS eliminating unnecessary three-phase shutdown. The device can work both independently and in combination with a standard automatic reclosing device. It provides the setting of time settings in digital form and their regulation with great accuracy and within wide limits, and also allows the indication of the type and nature of the short-circuit: unstable arc (arc extinguished), stable arc (arc does not extinguish) and metal - for subsequent statistics emergency cases. The technical and economic effect of using the device is achieved: by reducing the current-free pause of the PLLV with an unstable K3% elimination of unnecessary re-activation to a stable short circuit (arc or metal), which ultimately contributes to maintaining the stability of the power systems, power transmission capacity and its reliability, as well as facilitation of the working conditions of high-voltage switches and other power equipment, increasing the turnaround time of their work.

Claims (2)

00 oh CO pulses and the input of the first pulse shaper, the output of which is connected to the input of the second pulse shaper and the first input of the logic element AND, the second input of which is connected to the output of the third pulse counter, and the output of the second pulse shaper is connected to the zero input of the third pulse counter. 1. DEVICE FOR ADAPTIVE SINGLE-PHASE AUTOMATIC REPEAT OF THE ELECTRIC TRANSMISSION LINES, comprising a selective block, a selective block, connected in series to the deionization time delay unit and the switch-on unit of the disconnected phase switches, is connected; sequentially, a block for holding the time of a dead time and a block for three-phase shutdown, characterized in that, in order to increase the noise immunity of the device and the accuracy of its operation, a pulse generator, a trigger, and a block for permitting a single-phase automatic restart are introduced into it, in addition, a time delay block The deionization exchange is made from the first pulse counter and the element of setting the deionization time duration associated with its output, and the dead time pause block is from the second pulse counter in and associated with its output element for setting the duration of a dead time, and the first output of the electoral block is connected to the input of the pulse generator, the output of which is connected to the counting inputs of the first and second pulse counters, the second output of the selective flea is connected to the second input of the switching unit of the disconnected phase switches and to the first input of the single-phase automatic restart enable block, the output of which is connected to the second input of the element for setting the deionization time duration, the third input is which is connected to | the output of the job element for a long, non-current pause, the second input of which is connected to the output of the job element of the duration of the deionization time, and the output of the selective unit is connected to the zero input of the first pulse counter and to the trigger input, the output of which is connected to the second input of the unit 'permissions of single-phase automatic re-inclusion. • 2. The device according to claim 1, characterized in that the selective unit is made of a threshold element, a third pulse counter, two pulse shapers and an AND logic element, the input of the threshold element being connected to the input terminal of the device, and the output to the counting input of the third counter - about