JP2008301549A - Open-phase detector of receiving/distributing facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an open-phase detector of a receiving/distributing facility, which prevents an abnormal operation with a switch after open-phase detection. <P>SOLUTION: When first progress information t1 to be measured in a state where a line voltage V is lower than an open-phase voltage set value V1 becomes an open-phase judgement set value T1 during a first predetermined period S1, the open-phase detector 20 judges that open phase occurs with a switch in a receiving/distributing facility side and opens the switch. When second progress information t2 to be measured in a state where the line voltage exceeds the open-phase voltage set value becomes an open-phase recovery judgment set value T2 in a period from judgement of open phase to elapse of a second predetermined period S2, the detector 20 judges that open-phase is recovered and turns on the switch. The open-phase detector 20 is provided with a second progress information measurement inhibiting means 25 for setting a measurement inhibiting period S0 which is longer than a period from judgement of open phase to elapse of the period S2 and in which the progress information t2 to be measured in the state where the line voltage exceeds the open-phase voltage set value does not become the open-phase recovery judgement set value T2, and preventing measurement of the progress information t2 during the measurement inhibiting period. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a phase loss detection device for a power receiving and distribution facility that is connected to a distribution line drawn from a substation via a switch on the power source side and detects a phase loss on the distribution line side from this switch. is there.

  In the power distribution equipment that has a switch on the power supply side and is connected to the distribution line drawn from the substation via the switch, as shown in Patent Document 1, when an accident occurs in the distribution line, In the power distribution facility, the detection is made. Moreover, as shown in Patent Document 2, when a voltage is lost in a line switch connecting each section of a distribution line, the switch is opened.

  In the conventional phase loss detection device for power distribution facilities that detects phase loss on the distribution line side, the line voltage detected on the distribution line side of the switch is lower than the phase loss voltage setting value. It is determined that the phase is open and when the open phase voltage setting value is exceeded, it is determined that the phase is lost (recovery). When the phase is lost, the switch is opened, and when the phase is restored, the switch is turned on. Normally, when a phase loss is detected, the switch is opened, and when phase loss recovery is detected, the switch is turned on to complete.

  By the way, when the switch is opened, the voltage slightly fluctuates in the upward direction and may continue for a while. When the switch is turned on, the voltage fluctuates slightly in the downward direction and continues for a while. Sometimes.

  The phase loss voltage setting value is set close to the voltage level at the time of phase loss (above the voltage level at the time of phase loss) in order to increase the detection accuracy of phase loss, and the switch is opened upon detection of phase loss. If the voltage fluctuation in the electric rising direction at this time exceeds the phase loss voltage setting value, it is erroneously detected that the phase loss has been returned although the phase loss has not been restored. After that, the switch is turned on because the phase loss return is detected, and when the voltage fluctuation in the downward direction at that time falls below the phase loss voltage setting value, the phase loss is detected again, and this cycle is repeated. It will be. Therefore, the opening and closing of the switch is frequently repeated (however, until the phase loss returns to normal).

  FIG. 5 is a block diagram showing a conventional phase loss detection apparatus for power distribution equipment for avoiding the above abnormal state. The power distribution facility has a switch 1 on the power supply side, and supplies power to the load 2 through a transformer (not shown) connected to the switch 1. The switch 1 is connected to a three-phase distribution line 3 drawn from a substation via a lead-in wire. As shown in the figure, the phase loss detection device 5 provided in the power distribution facility includes a voltage detector 51 that detects the line voltage V of the three-phase distribution line, a phase loss / return determination unit 52, and a switch opening / closing logic unit 53. And a switch drive unit 54.

  The phase loss / return determination unit 52 is set to the “H” level when the phase loss voltage setting value V1 for detecting the phase loss voltage is set and the line voltage V detected by the voltage detector 51 is V> V1. <If the input voltage is V1, the input level detector 52a that outputs the “L” level and the line voltage falls below the open-phase voltage setting value V1 set by the input level detector 52a within one cycle of the distribution line voltage In addition, the first progress information collecting unit 52b1 that generates one pulse and counts the pulses during the first predetermined period S1, for example, every two seconds, is counted by the first progress information collecting unit 52b1. The first storage unit 52b2 that stores the count value (first progress information) t1 for each predetermined period and the count value (first progress information) t1 by the first progress information collection unit 52b1 are determined to be out of phase. Set value T1 (frequency of distribution line voltage is 50Hz Te, if 100 pulses) when one pulse generated per cycle of 2 seconds, and a phase-loss determination unit 52b3 for outputting the "H" level.

  Further, when the line voltage exceeds the phase loss voltage set value V1 set by the input level detector 52a within one cycle of the distribution line voltage, one pulse is generated, and the phase loss determination unit 52b3 A second progress information collection unit 52c1 that counts pulses for a second predetermined period S2, for example, 0.5 seconds from the determination or the same determination, and resets the pulses when the predetermined period S2 has elapsed; and a second progress information collection unit The second storage unit 52c2 that stores the count value (second progress information) t2 counted in 52c1 and the count value (second progress information) t2 by the second progress information collection unit 52c1 are used to determine the phase loss return. When the set value T2 is reached (25 pulses if one pulse is generated for each cycle of 0.5 seconds), the phase loss recovery determination unit 52c3 outputs an “H” level.

  The switch switching logic unit 53 includes a NOT circuit 53a that inverts the output of the phase loss determination unit 52b3, and an OR circuit 53b that receives the output of the NOT circuit 53a and the output of the phase loss return determination unit 52c3. When the output of the OR circuit 53b changes from the “L” level to the “H” level, a closing command is output to the switch, and when the output from the “H” level changes to the “L” level, an opening command is output to the switch 1. .

  The switch driving unit 54 keeps the switch 1 turned on while the output of the switch opening / closing logic unit 53 is “H” level, and keeps the switch 1 open while the output is “L” level.

  When the output of the phase loss determination unit 52b3 changes from the “L” level to the “H” level (rising), the count in the second progress information collection unit 52c1 is started, and the second storage unit 52c2 The stored count value (second progress information) t2 is cleared. When the output of the phase loss return determination unit 52c3 changes from “L” level to “H” level (rising), the count value (first elapsed information) t1 stored in the first storage unit 52b2 is cleared. The The count values of the first progress information collection unit 52b1 and the second progress information collection unit 52c1 are reset in the initial state (at the start of operation of the phase loss detection device).

  By the way, the phase loss judgment set value T1 and the phase loss return judgment set value T2 are always opened when a normal “phase loss” is detected, and are opened and closed when a normal “phase loss return” is detected. It is selected so that it can be filled with the instrument.

  FIG. 6A is a time chart for explaining a conventional abnormal state. In the above configuration, in the initial state, the outputs of the phase loss determination unit 52b3, the phase loss return determination unit 52c3, the NOT circuit 53a, and the switch opening / closing logic unit 53 are “L” level, “L” level, “H” level, It becomes "H" level, and the switch 1 is turned on.

  Thereafter, when the detected line voltage V continues to be lower than the phase loss voltage setting value V1 during the first constant period S1, the first elapsed information collection unit 52b1 counts the first storage time. When the count value (first progress information) t1 stored in the unit 52b2 reaches the phase loss detection set value T1 when the predetermined period S1 has elapsed, the output of the phase loss determination unit 52b3 changes from the “L” level to the “H” level. Therefore, the output of the switch opening / closing logic unit 53 together with the NOT circuit 53a changes from the “H” level to the “L” level. That is, since it is determined that the phase is open, the switch 1 is opened. Note that the output of the phase loss return determination unit 52c3 remains at the “L” level.

  The line voltage V after opening the switch is determined to be a phase loss and gradually decreases due to voltage fluctuation (increase), and the phase loss voltage is set from the time when the phase is determined to be a phase loss until the second fixed period S2 has elapsed. When the value V1 is lower than the value V1, the count value (second progress information) t2 counted by the second progress information collection unit 52c1 and stored in the second storage unit 52c2 is equal to the predetermined period S2. Since the phase loss return determination setting value T2 is not reached during the lapse of time, the output of the phase loss return determination unit 52c3 remains at the “L” level, and the output of the phase loss return determination unit 52b3 remains at the “H” level. Further, the output of the switch opening / closing logic unit 53 together with the NOT circuit 53a remains at the “L” level. That is, the switch 1 is not turned on because it is not determined that the phase loss has been recovered.

  However, if the line voltage V continues to exceed the open-phase voltage set value V1 during the second constant period S2, it is counted by the second progress information collecting unit 52c1 and stored in the second storage unit 52c2. When the stored count value (second progress information) t2 reaches the missing phase return determination setting value T2 when the predetermined period S2 has elapsed, the output of the missing phase return determination unit 52c3 changes from the “L” level to the “H” level. Therefore, the output of the switch opening / closing logic unit 53 is also changed from the “L” level to the “H” level. That is, since the same determination as the phase loss return is made, the switch 1 is turned on. Since the count value (first progress information) t1 stored in the first storage unit 52b1 is reset when the output of the phase loss return determination unit 52c3 becomes “H” level, the phase loss determination unit The output of 52b3 is changed from "H" level to "L" level.

  In the case where the same determination as the phase loss return is made and the line voltage V after the switch is turned on gradually decreases and falls below the state where the phase loss voltage set value V1 is exceeded during the first fixed period S1, Since the count value (first progress information) t1 counted by the first progress information collection unit 52b1 and stored in the first storage unit 52b2 does not reach the phase loss detection set value T1 when the predetermined period S1 has elapsed, The output of the phase determination unit 52b3 is reset when the output of the phase loss recovery determination unit 52c3 becomes "H" level and remains at the "L" level. Further, the phase loss recovery determination unit 52c3 and the switch opening / closing logic unit The output of 53 remains at “H” level. That is, the switch 1 is not opened because it is not determined that the phase is lost.

  However, when the line voltage V continues to be lower than the phase loss voltage setting value V1 during the first fixed period S1, it is counted by the first progress information collecting unit 52b1 and stored in the first storage unit 52b2. When the stored count value (first progress information) t1 reaches the missing phase detection setting value T1 when the predetermined period S1 has elapsed, the output of the missing phase determination unit 52b3 changes from the “L” level to the “H” level. The output of the NOT circuit becomes “L” level, and the output of the switch opening / closing logic unit 53 changes from “H” level to “L” level. That is, since it is determined that there is an open phase, the switch is opened. When the output of the phase loss determination unit 52b3 becomes “H” level, the count value (second progress information) t2 stored in the second storage unit 52c2 is reset and the phase loss recovery determination unit 52c3 The output changes from “H” level to “L” level. In addition, counting by the second progress information collection unit 52c1 is started.

  The line voltage V after the opening of the switch is determined to be the same as the phase loss and gradually decreases, and exceeds the phase loss voltage setting value V1 from the time when the phase is erroneously determined until the second fixed period S2 elapses. When the current state falls below the current state, the count value (second progress information) t2 counted by the second progress information collecting unit 52c1 and stored in the second storage unit 52c2 is returned to the phase loss when the predetermined period S2 has elapsed. Since the determination set value T2 is not reached, the output of the phase loss return determination unit 52c3 remains at “L” level, the output of the phase loss determination unit 52b3 remains at “H” level, and the NOT circuit Together with 53a, the output of the switch opening / closing logic unit 53 remains at "L" level. That is, the switch 1 is not turned on because it is not determined that the phase loss has been recovered.

  However, if the line voltage V continues to exceed the open-phase voltage set value V1 during the second constant period S2, it is counted by the second progress information collecting unit 52c1 and stored in the second storage unit 52c2. When the stored count value (second progress information) t2 reaches the missing phase return determination setting value T2 when the predetermined period S2 has elapsed, the output of the missing phase return determination unit 52c3 changes from the “L” level to the “H” level. Therefore, the output of the switch opening / closing logic unit 53 is also changed from the “L” level to the “H” level. That is, since the same determination as the phase loss return is made again, the switch 1 is turned on. Note that when the output of the phase loss return determination unit 52c3 becomes “H” level, the count value (first progress information) t1 stored in the first storage unit 52b2 is reset and the phase loss determination unit 52b3 The output changes from “H” level to “L” level.

FIG. 6B is a time chart for explaining a conventional normal phase loss and phase loss return state. By the way, a state in which the line voltage V after the opening of the switch is determined to be an open phase or is determined to be the same, and remains below the open phase voltage set value V1 even after a certain period of time S2 has elapsed since the determination was made. When the phase loss is restored normally and the line voltage V exceeds the phase loss voltage setting value V1, the count value is counted by the second progress information collecting unit 52c1 and stored in the second storage unit 52c2. (Second progress information) When t2 reaches the phase loss return determination set value T2 when the predetermined period S2 has elapsed, the output of the phase loss return determination unit 52c3 changes from "L" level to "H" level. The output of the open / close logic unit 53 is also changed from the “L” level to the “H” level. That is, it is determined that the phase loss has been recovered, and the output of the phase loss recovery determination unit 52c3 is maintained at the “H” level, so that the switch is turned on and maintained.
JP 11-215688 A JP 2003-158832 A (paragraph number 0017)

  Even if the line voltage detection period after opening the switch is determined to be a phase failure and the same, the switch may be turned on even though the phase loss has not been restored. Even if the line voltage detection period after turning on the switch is determined to be a predetermined period after the switch is determined to be phase return or the same, the switch may be opened due to the same determination as an open phase. If the device is opened and opened, there is a possibility that the problem of repeated opening and closing of the switch occurs.

  An object of the present invention is to provide a phase loss detection device for a power receiving and distribution facility that prevents an abnormal operation of a switch after detection of phase loss.

  The first invention has a switch on the power supply side, is connected to a distribution line drawn from the substation via the switch, and the line voltage detected on the distribution line side of the switch is the first constant. If the first progress information measured from the state where the phase loss voltage is lower than the phase loss voltage setting value during the period becomes the phase loss determination setting value, it is determined that phase loss has occurred on the distribution line side from the switch, and the switch is The second elapsed information measured from the state where the line voltage exceeds the open phase voltage setting value between the time when the open phase is determined and the second fixed period elapses is the open phase return determination set value. In this case, the phase loss return voltage setting value larger than the phase loss voltage setting value is set for the phase loss detection device of the power receiving and distribution equipment that determines that the phase loss has been restored and switches on the switch. The line voltage after switching is determined to be open phase is between the open phase voltage set value and open phase return voltage set value. If that one in which the second status information is provided with the second elapsed information measuring inhibiting means not measured.

  The second invention has a switch on the power source side, is connected to a distribution line drawn from the substation via the switch, and the line voltage detected on the distribution line side of the switch is the first constant. If the first progress information measured from the state where the phase loss voltage is lower than the phase loss voltage setting value during the period becomes the phase loss determination setting value, it is determined that phase loss has occurred on the distribution line side from the switch, and the switch is The second elapsed information measured from the state where the line voltage exceeds the open phase voltage setting value between the time when the open phase is determined and the second fixed period elapses is the open phase return determination set value. If this is the case, it is intended for a phase failure detection device of a power receiving and distribution facility that determines that the phase loss has been restored and switches on the switch, and is longer than when the second fixed period has elapsed since the phase was determined to be open, In addition, the second progress information measured from the state where the line voltage exceeds the phase loss voltage setting value is the phase loss recovery. With measurement prohibition period that does not cause the constant set value is set, in which the second status information is provided with the second elapsed information measuring inhibiting means not measured during the measurement prohibition period.

  As described above, according to the first invention, it is possible to prevent an abnormal operation in which the opening / closing of the switch after the detection of the phase failure is repeated.

  According to the second invention, the abnormal operation of repeatedly opening and closing the switch after detecting the open phase regardless of the magnitude of the line voltage immediately after the open phase is detected and the switch is opened. Can be prevented.

  FIG. 1 is a block diagram showing a first embodiment of a phase loss detection apparatus for power distribution equipment according to the present invention. FIG. 2 is a time chart for explaining a normal phase loss and phase loss return state according to the first embodiment.

  The phase loss detection device 10 includes a voltage detector 11 that detects the line voltage V of the three-phase distribution line, a phase loss / return determination unit 12, a switch switching logic unit 13, a switch drive unit 14, and a second The progress information measurement prohibition unit 15 is configured.

  The phase loss / return determination unit 12 is set to the phase loss voltage setting value V1 for detecting the phase loss of the detected line voltage V. If V> V1, the “H” level is set. If V <V1, “ When the line voltage V falls below the open-phase voltage set value V1 within one cycle of the distribution line voltage, one pulse is generated and the first constant period S1 For example, the first progress information collection unit 12b1 that counts pulses during the predetermined period every 2 seconds, and the count value (first progress information) t1 counted by the first progress information collection unit 12b1 The count value (first progress information) t1 by the first storage unit 12b2 and the first progress information collection unit 12b1 stored for each period is an open phase determination set value T1 (the frequency of the distribution line voltage is 50 Hz, 2 100 pulses per pulse per second If the pulse), and a phase-loss determination unit 12b3 for outputting the "H" level.

  When the line voltage V exceeds the phase loss voltage setting value V1 within one cycle of the distribution line voltage, one pulse is generated, and the second phase from when the phase failure determination unit 12b3 determines or is determined to be phase loss. The second progress information collection unit 12c1 that counts pulses for a certain period S2, for example, 0.5 seconds, and resets when the predetermined period S2 has elapsed, and the count value (second count) counted by the second progress information collection unit 12c1 Count value (second progress information) t2 by the second storage unit 12c2 that stores t2) and the second progress information collection unit 12c1 is the phase loss return determination set value T2 (1 for 0.5 second) When one pulse is generated for each cycle, the number of pulses becomes 25), and the phase loss return determination unit 12c3 outputs an “H” level.

  The switch switching logic unit 13 includes a NOT circuit 13a that inverts the output of the phase loss determination unit 12b3, an OR circuit 13b that receives the output of the phase loss return determination unit 12c3 and the output of the NOT circuit 13a. When the output of the OR circuit 13b changes from the “L” level to the “H” level, the switch drive unit 14 outputs a closing command to the switch 1 and when the output from the “H” level changes to the “L” level, the switch 1 Causes the release command to be output.

  The switch drive unit 14 keeps the switch 1 on while the output of the switch switching logic unit 13 is at “H” level, and keeps the switch 1 open while the output is “L” level.

  The second progress information measurement prohibition unit 15 sets the phase loss return voltage setting value V2 for detecting the phase loss return voltage to be larger than the phase loss voltage setting value V1, and the detected line voltage V satisfies V> V2. If there is an “H” level, and if V <V2, an input level detector 15a that outputs an “L” level and an output of the input level detector 15a are input, and an output of the phase loss determination unit 12b3 is input. When the output of the AND circuit 15b changes from the “L” level to the “H” level (rising), the second progress information collecting unit 12c1 starts counting.

  When the output of the phase loss return determination unit 12c3 changes from “L” level to “H” level (rising), the count value (first elapsed information) t1 stored in the first storage unit 12b2 is cleared. The The count values of the first progress information collection unit 12b1 and the second progress information collection unit 12c1 are reset in the initial state (at the start of operation of the phase loss detection device).

  In the above configuration, in the initial state, the outputs of the phase loss determination unit 12b3, the phase loss return determination unit 12c3, the NOT circuit 13a, and the switch switching logic unit 13 are “L” level, “L” level, “H” level, It becomes "H" level, and the switch 1 is turned on.

  Thereafter, when the detected line voltage V continues to be lower than the phase loss voltage setting value V1 during the first predetermined period S1, the first elapsed information collection unit 12b1 counts the first storage time. When the count value (first progress information) t1 stored in the unit 12b2 reaches the phase loss detection set value T1 when the predetermined period S1 has elapsed, the output of the phase loss determination unit 12b3 is changed from the “L” level to the “H” level. Therefore, the output of the switch opening / closing logic unit 13 together with the NOT circuit 13a changes from the “H” level to the “L” level. That is, since it is determined that the phase is open, the switch 1 is opened. Note that the output of the phase loss return determination unit 12c3 remains at the “L” level.

  When the line voltage V is between the open phase voltage setting value V1 and the open phase return voltage set value V2 immediately after the switch 1 is opened after the switch 1 is opened, the second progress information measurement is performed. Since the output of the AND circuit 15b of the prohibition unit 15 remains at the “L” level, the second progress information collection unit 12c1 is not counted. That is, although the line voltage V exceeds the phase loss voltage setting value V1, it is not determined that the phase loss has been restored.

  Thereafter, when the line voltage V exceeds the phase loss return voltage setting value V2, the output of the AND circuit 15b of the second progress information measurement prohibition unit 15 changes from “L” level to “H” level. When the count value (second progress information) t2 counted by the second progress information collection unit 12c1 and stored in the second storage unit 12c2 reaches the phase loss return determination setting value T2 when the second predetermined period S2 has elapsed. Since the output of the phase loss return determination unit 12c3 is changed from the “L” level to the “H” level, the output of the switch opening / closing logic unit 13 is also changed from the “L” level to the “H” level. That is, it is determined that the phase loss has returned normally, and the output of the phase loss return determination unit 12c3 is maintained at the “H” level, so that the switch is turned on and maintained.

  FIG. 3 is a block diagram showing a second embodiment of the phase loss detection apparatus for power receiving and distribution equipment according to the present invention. FIG. 4 is a time chart for explaining a normal phase loss and phase loss return state according to the second embodiment.

  The phase loss detection device 20 includes a voltage detector 21 that detects the line voltage V of the three-phase distribution line, a phase loss / return determination unit 22, a switch opening / closing logic unit 23, a switch driving unit 24, a second The progress information measurement prohibition unit 25 is configured.

  The phase loss / return determination unit 22 is set to the phase loss voltage setting value V1 for detecting the phase loss of the detected line voltage V. If V> V1, the “H” level is set. If V <V1, “ When the line voltage V falls below the open-phase voltage set value V1 within one cycle of the distribution line voltage, one pulse is generated and the first constant period S1 For example, the first progress information collection unit 22b1 that counts pulses during the predetermined period every 2 seconds, and the count value (first progress information) t1 counted by the first progress information collection unit 22b1 The count value (first progress information) t1 by the first storage unit 22b2 and the first progress information collection unit 22b1 stored for each period is an open phase determination set value T1 (the frequency of the distribution line voltage is 50 Hz, 2 100 pulses per pulse per second If the pulse), and a phase-loss determination unit 22b3 for outputting the "H" level.

  When the line voltage exceeds the open-phase voltage set value V1 within one cycle of the distribution line voltage, one pulse is generated, and the second phase from the time when the open-phase determination unit 22b3 determines that the open-phase is or is determined to be open. The second progress information collection unit 22c1 that counts pulses for a certain period S2, for example, 0.5 seconds, and resets when the certain period S2 has elapsed, and the count value (second value) counted by the second progress information collection unit 22c1 The count value (second progress information) t2 by the second storage section 22c2 that stores the progress information) t2 and the second progress information collection section 12c1 is the phase loss return determination set value T2 (one cycle of 0.5 seconds) When one pulse is generated every time, 25 pulses are generated), and an open phase return determination unit 22c3 that outputs an “H” level is included.

  The switch switching logic unit 23 includes a NOT circuit 23a that inverts the output of the phase loss determination unit 22b3, an OR circuit 23b that receives the output of the NOT circuit 23a and the output of the phase loss return determination unit 22c3. When the output of the OR circuit 23b changes from the “L” level to the “H” level, the switch drive unit 24 outputs a closing command for the switch 1, and when the output from the “H” level changes to the “L” level, the switch 1 Causes the release command to be output.

  The switch driving unit 24 keeps the switch 1 turned on while the output of the switch opening / closing logic unit 23 is “H” level, and keeps the switch 1 open while the output is “L” level.

  The second progress information measurement prohibition unit 25 includes a timer circuit 25a to which the output of the phase loss determination unit 22b3 is input and a NOT circuit 25b that inverts the output of the timer circuit 25a. The output of the phase loss determination unit 12b3 is When the “L” level is changed to the “H” level (rising), the timer circuit 25a operates to output the “H” level. After a predetermined time has elapsed, the timer circuit 25a becomes the “L” level, and the output of the NOT circuit 25b is When the level changes from “L” level to “H” level (rising), the second progress information collection unit 22c1 starts counting. The predetermined time (measurement prohibition period) S0 is longer than the time when it is determined that the phase is lost to the time when the second predetermined period S2 has elapsed, and the line voltage V exceeds the phase loss voltage setting value V1. Is set in accordance with the substance so that the second progress information t2 measured from 1 does not become the phase loss return determination set value T2.

  When the output of the phase loss return determination unit 22c3 changes from “L” level to “H” level (rise), the count value (first elapsed information) t1 stored in the first storage unit 22b2 is cleared. The The count values of the first progress information collection unit 22b1 and the second progress information collection unit 22c1 are reset in the initial state (when the phase loss detection device starts operating).

  In the above configuration, in the initial state, the outputs of the phase loss determination unit 22b3, the phase loss recovery determination unit 22c3, the NOT circuit 23a, and the switch opening / closing logic unit 23 are “L” level, “L” level, “H” level, It becomes "H" level, and the switch 1 is turned on.

  Thereafter, when the detected line voltage V continues to be lower than the phase loss voltage setting value V1 during the first constant period S1, the first storage information 22b1 counts the first storage information. When the count value (first progress information) t1 stored in the unit 22b2 reaches the phase loss detection set value T1 when the predetermined period S1 has elapsed, the output of the phase loss determination unit 22b3 changes from the “L” level to the “H” level. Therefore, the output of the switch opening / closing logic unit 23 together with the NOT circuit 23a changes from the “H” level to the “L” level. That is, since it is determined that the phase is open, the switch 1 is opened. Note that the output of the phase loss recovery determination unit 22c3 remains at the “L” level.

  After the switch 1 is opened, when the line voltage V exceeds the open-phase voltage setting value V1 immediately after the switch 1 is opened, the output of the NOT circuit 25b of the second progress information measurement prohibition unit 25 is “ Since it remains at the “L” level, the second progress information collecting unit 22c1 is not counted. That is, although the line voltage V exceeds the phase loss voltage setting value V1, it is not determined that the phase loss has been restored.

  When the line voltage V exceeds the open-phase voltage set value V1 after a predetermined time has elapsed by the timer circuit 25a, the output of the NOT circuit 25b of the second elapsed information measurement prohibiting unit 25 is “ Since the “L” level changes to the “H” level, the count value (second progress information) t2 counted by the second progress information collecting unit 22c1 and stored in the second storage unit 22c2 is the second fixed period. When the phase loss recovery determination set value T2 is reached when S2 has elapsed, the output of the phase loss recovery determination unit 22c3 changes from the “L” level to the “H” level, so the output of the switch opening / closing logic unit 23 also starts from the “L” level. It becomes “H” level. That is, it is determined that the phase loss has returned normally, and the output of the phase loss return determination unit 22c3 is maintained at the “H” level, so that the switch is turned on and maintained.

It is a block diagram which shows 1st Embodiment of the phase loss detection apparatus of the power distribution equipment which concerns on this invention. It is a time chart figure explaining the normal phase loss and phase loss return state of a 2nd embodiment. It is a block diagram which shows 2nd Embodiment of the phase loss detection apparatus of the power distribution equipment which concerns on this invention. It is a time chart figure explaining the normal phase loss and phase loss return state of a 2nd embodiment. It is a block diagram which shows the phase loss detection apparatus of the conventional power receiving / distributing equipment for avoiding an abnormal state. (A) is a time chart explaining the conventional abnormal state. (B) is a time chart illustrating a conventional normal phase loss and phase loss return state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Switch 3 Distribution line V Line voltage S1 1st fixed period V1 Open phase voltage setting value t1 1st progress information T1 Open phase determination setting value S2 2nd fixed period t2 2nd progress information T2 Open phase return Determination set value S0 Measurement prohibition period 25 Second progress information measurement prohibition means

Claims (2)

A switch on the power supply side is connected to the distribution line drawn from the substation via the switch, and the line voltage detected on the distribution line side of the switch is missing during the first fixed period. If the first progress information measured from the state below the phase voltage set value is a phase loss determination set value, it is determined that a phase loss has occurred on the distribution line side from the switch, and the switch is opened. If the second progress information measured from the state in which the line voltage exceeds the open phase voltage setting value between the time when it is determined as open phase and the elapse of the second fixed period has reached the open phase return determination set value , A phase loss detection device for power distribution equipment that determines that phase loss has been restored and switches on the switch,
A phase loss return voltage setting value larger than the phase loss voltage setting value is set, and the line voltage after opening the switch is determined as a phase loss and the phase loss voltage setting value and the phase loss recovery voltage setting value are A phase loss detection device for a power receiving and distribution facility provided with a second progress information measurement prohibition means in which the second progress information is not measured when it is between. A switch on the power supply side is connected to the distribution line drawn from the substation via the switch, and the line voltage detected on the distribution line side of the switch is missing during the first fixed period. If the first progress information measured from the state below the phase voltage set value is a phase loss determination set value, it is determined that a phase loss has occurred on the distribution line side from the switch, and the switch is opened. If the second progress information measured from the state in which the line voltage exceeds the open phase voltage setting value between the time when it is determined as open phase and the elapse of the second fixed period has reached the open phase return determination set value , A phase loss detection device for power distribution equipment that determines that phase loss has been restored and switches on the switch,
The second progress information measured from a state in which the line voltage is longer than the time when the second predetermined period has elapsed from the time when it is determined that the phase is lost and the line voltage exceeds the set value of the phase loss voltage is the phase loss recovery. A phase loss detection device for a power distribution facility provided with a second progress information measurement prohibition unit in which a measurement prohibition period that does not become a determination set value is set and second progress information is not measured during the measurement prohibition period.

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