RU2531385C1 - Method to control successful automatic reclosure of main line breaker with reduction of reclosure delay time - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention is used in electrical engineering. According to the method when surge of short-circuiting current occurs monitoring pulses are sent to all lines and emergency mode parameters are defined by calculation of a number of reflection points and distances to each point, upon disappearance of short-circuiting current the line parameters are defined in the similar way and compared with the preset emergency mode parameters and normal mode parameters defined at normal operation of the line, and when at the beginning of comparison the parameters received upon disappearance of short-circuiting current are the same as normal mode parameters then the signal will be sent to automatic reclosure of the main breaker and when the above parameters are the same as emergency mode parameters then comparison and definition of these parameters will be continued and when later, at any moment before delay time for automatic reclosure of the main breaker is over the calculated parameters are the same as normal mode parameters, then the signal will be sent for reclosure and when surge of operating current is recorded thereafter then the conclusion is made about successful automatic reclosure of the main breaker in the line with reduction of delay time for its reclosure.

EFFECT: broader functional capabilities.

2 dwg

Description

The invention relates to the automation of electrical networks and is intended to control the successful automatic restart (AR) of the head circuit breaker (GW) of the line with a decrease in the exposure time for its inclusion.

There is a method of monitoring the change in the state of the hot water in the ring network line, which consists in the fact that from the moment of the appearance of the short-circuit current surge at the beginning of the sectioned line of the ring network, the time equal to the response time of the hot-wire protection is counted, and the time of the short-circuit current cut-off is monitored. If the moment of the end of the countdown coincides with the moment of disconnection of the first inrush short-circuit current, then the fact of disconnecting the hot water is established. And then from the moment of switching off the first inrush short-circuit current, they start the countdown of the reclosure time and the total time equal to the reclosure time of the reclosure and the response time of its protection with acceleration. At the same time, the appearance of a second current surge is controlled, and if at the end of the countdown of the reclosure time, there is no second inrush of a value greater than the normal operating current, but less than the short-circuit current or equal to the short-circuit current, then the fact of the reclosure of the reclosure loop of the GV line of the ring network is established. Or, at the end of the countdown of the reclosure time, the second short-circuit current appears, the value is more than the normal operating voltage, but less than the short-circuit current, then the fact of a successful reclosure of short-circuit arrester appears, or if a second surge of the short-circuit current appears at the moment the countdown of the exposure time of reclosure is established, then the fact of failure AR recirculation line loop network. And further, if after the appearance of the second inrush current short circuit, at the end of the countdown of the total time, the second inrush current does not turn off, then the fact of failure to turn off the hot water when it is turned on again is established [patent RU No. 2410817 C1, cl. H02J 13/00, 9/06, publ. 01/27/2011, bull. Number 3].

The disadvantage of this method is the impossibility of using it to control the successful reclosure of the hot water line with a decrease in the exposure time for its inclusion.

The objective of the invention is to expand the functionality of the method by obtaining information about the successful reclosure of the hot water line with a decrease in the exposure time for its inclusion.

According to the proposed method, when a short-circuit current occurs, probing pulses are sent to all wires of the line and the emergency mode parameters are determined by calculating the number of reflection points and distances to each point, after the short-circuit current disappears, the line parameters are again determined in the same way and compared with previously determined emergency mode parameters and the parameters of the normal mode determined in the normal mode of operation of the line, and if at the beginning of the comparison the parameters obtained after the disappearance of the short-circuit current are identical with the parameters of the normal mode, then they send a signal to the automatic reclosure heater, and if the parameters obtained after the disappearance of the short-circuit current are the same as the parameters of the emergency mode, then they continue to determine and compare these parameters, and if later, at some point in time before the end of time the shutter speed of automatic recirculation of hot water, the calculated parameters become the same with the parameters of the normal mode, then a signal is sent to turn it on, and if after that an inrush of the operating current is recorded, then it is concluded that the automatic speed of storage of hot water is successful with a decrease in time Derzhko on its inclusion.

The essence of the invention is illustrated by drawings, where:

- figure 1 provides a structural diagram containing elements for implementing the method;

- figure 2 is a diagram of the signals at the outputs of the elements shown in figure 1 with an unstable short circuit at point 15 (see figure 1).

The circuit (see FIG. 1) contains: a power transformer 1, an input switch 2, lines 3, 4, 5, 6 and 7, a head switch 8, a short-circuit current sensor (DTKZ) 9, an operating current sensor (DRT) 10, a block information processing (BOI) 11, a probe pulse generator (GZI) 12, a probe pulse probe (PZI) 13, a recording device (RU) 14, a short-circuit point 15.

The signal diagrams at the outputs of the elements shown in figure 1 at short circuit at point 15 (see figure 1) have the form (see figure 2): 16 - at the output of element 9, 17 - at the output of element 10, 18 - at the output of the element 11, 19 - at the output of the element 12, 20 - at the output of the element 13, 21 - ASU 14.

In Fig.2, in addition to the diagrams of the output signals of the circuit elements, t ₁ is the time instant of occurrence of an unstable fault at point 15, t ₂ is the time instant of disconnection of the fault current, t ₃ is the moment of self-elimination of the fault, t ₄ is the end time of the AR GV lines.

The method is as follows.

In the normal mode of operation of the network, the input switch 2 and the head switch 8 are turned on, there is no short circuit in the line, therefore, there is no signal at the DTKZ 9 output either (Fig. 2, Diagram 16) and the circuit is in control mode.

When an unstable fault occurs, for example, at point 15, the output of DTKZ 9 will display a signal (Fig. 2, Diagram 16, time t1), which will arrive at the first input of the BOI 11 from its first output (Fig. 2, Diagram. 18) the signal will go, which will go to the GZI 12. At the same time, the GZI 12 will send probe pulses to all wires of the line (Fig. 2, Diagram 19), which, having reached the reflection points, will return back and go to the PZI 13 and from its output (figure 2, diag. 20) will go to BOI 11. This element will determine the line parameters by calculating the distances to all reflection points, which will be The parameters of the emergency mode of the line. After the delay time of the protection actuation, the GV 8 will turn off and the signal will disappear from the output of the DTKZ 9 (Fig. 2, Diagram 16, time t2). At this point in time, from the output of the BOI 11, the signal will again go to the input of the GZI 12 (Fig. 2, Diagram 18, time t ₂ ), while from its output all probe wires with a certain periodicity will again send probing pulses (Fig. 2 , Diag. 19), which, reaching the reflection points and returning, will go to FDI 13, and from its output (Fig. 2, Diag. 20) will go to BOI 11. This element, again, at each arrival of reflected pulses, determine the parameters of the line and compare them with the parameters of the normal mode obtained in a similar way in normal operation inii, and if the parameters obtained after tripping fault current will be identical to the normal mode parameters, the BOI 11 will stop sending signals to the SPG 12 and gives the signal for reclosure GW 8, wherein the posting of probing pulses on the line ceases. And if the parameters of the line obtained after switching off the short-circuit current are the same as the parameters of the emergency mode, then the sending of probing pulses to the line will continue until the short-circuit eliminates, which will occur, for example, at time t ₃ . In this case, the parameters of the line will become the same with the parameters of the normal mode and then the sending of the probe pulses to the line will stop, and a signal will come from the second output of the BOI 11 (Fig. 2, Diagram 18, time t3), which will send a command to the reclosure arrester GW 8. It will turn on, at the output of the DRT 10 a signal will appear (Fig. 2, Diagram 17), which will go to the second input of the BOI 11, while a signal will appear at its third output (Fig. 2, Diagram 18, time t ₃ ). This signal will go to RU 14, and there will appear information on the successful reclosure of the HS 8 with a decrease in the exposure time for its inclusion.

Thus, when using the proposed method, it is possible to obtain information about the successful reclosure of the hot water line with a decrease in the exposure time for its inclusion.

Claims (1)

A method for monitoring the successful automatic restart (AR) of the line head switch (GW) with decreasing the dwell time for switching it on, which consists in fixing the inrush currents and in measuring the time between them, characterized in that when an inrush current occurs, short-circuit probes are sent to all wires of the line pulses and determine the emergency mode parameters by calculating the number of reflection points and the distances to each point, after the short-circuit current disappears, the line parameters are again determined in the same way and compared with its defined emergency mode parameters and normal mode parameters defined in the normal mode of operation of the line, and if at the beginning of the comparison the parameters obtained after the disappearance of the short-circuit current are the same as the parameters of the normal mode, then they give a signal to the automatic reclosure, and if the parameters obtained after the disappearance of the short-circuit current will be the same with the parameters of the emergency mode, then they continue to determine and compare these parameters, and if later, at some point in time before the end of the exposure time of the reclosure autogrower, calculated by ry become identical with the normal mode parameters, then the signal is fed to its incorporation, and thereafter if fixed working inrush current, then conclude successful HS reclosure line with decreasing holding time for its inclusion.

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