JP4403968B2 - Disconnection detector for high voltage distribution lines - Google Patents

Description

  The present invention relates to a disconnection detection device for a high-voltage distribution line that detects disconnection of a three-phase high-voltage distribution line.

  Generally, a high-voltage distribution system has a plurality of switches in the middle of a high-voltage distribution line, and when a fault such as a ground fault occurs in a section divided by the switch, the failure section is separated by a switch and a healthy section Can be supplied with power. At that time, power is supplied from another high-voltage distribution system to the healthy section downstream of the failure section.

  That is, the switch of its own system supplies power in a normally closed state, and the switch for connection with another system is normally operated in an open state. When a failure occurs in a section of the own system, the failure section is identified by reclosing, and the failure section is separated and power is supplied from another system to the healthy section downstream of the failure section. Yes. The opening / closing operation of the switch in this case is operated by a remote controller installed in the vicinity of the switch. The remote controller performs an opening / closing operation of the switch based on a command from the central controller (see, for example, Patent Document 1).

Here, there is one in which the three-phase voltage of the high-voltage distribution line is detected and the disconnection of the high-voltage distribution line is detected by determining the ratio of the magnitudes of the voltages. In other words, a slave station is added to a plurality of pole-mounted single-phase transformers connected to a high-voltage distribution line, and the secondary voltage of the transformer is monitored at this slave station, and the three-phase load of the high-voltage distribution system is significantly unbalanced. In some cases, a disconnection section and a disconnection candidate can be reliably detected in a state (see, for example, Patent Document 2).
Japanese Patent Publication No. 1-59820 JP-A-7-113838

  However, the thing of patent document 1 assumes a ground fault accident or a short circuit accident, and does not assume disconnection detection. In other words, the protective relay that detects the accident is provided upstream of the high-voltage distribution line.For example, when the protective relay detects a ground fault, it is determined that a ground fault has occurred, the circuit breaker is opened, and then the circuit is reclosed. The failure section is specified. Therefore, when a disconnection without a ground fault occurs, the occurrence of a ground fault cannot be detected, so that the disconnection cannot be detected.

  Moreover, in the thing of patent document 2, since the voltage for three phases is detected from a pole transformer, and disconnection detection is performed by the ratio of the magnitude | size of the three-phase voltage, the voltage which detects a three-phase voltage It is necessary to provide a new detector. In addition, since disconnection is detected by the voltage value, the voltage detector needs a certain degree of detection accuracy.

  An object of the present invention is to provide a disconnection detecting device for a high-voltage distribution line that can perform disconnection detection using a voltage detected by a voltage detector having an existing detection accuracy without providing a new voltage detector. is there.

  The disconnection detecting device for a high-voltage distribution line according to the invention of claim 1 is a high-voltage single-phase voltage input from a power supply-side three-phase voltage and a load-side three-phase voltage of a switch connected to the high-voltage distribution line. The voltage input means and the low voltage distribution line by stepping down the other two phases different from one phase of the high voltage single phase voltage from the power supply side three phase voltage and the load side three phase voltage of the high voltage distribution line by a single phase transformer, respectively. The low-voltage voltage input means for inputting the low-voltage single-phase voltage, the high-voltage single-phase voltage input by the high-voltage voltage input means, and the low-voltage single-phase voltage input by the low-voltage voltage input means A disconnection determining means for detecting disconnection is provided.

  The disconnection detecting device for a high-voltage distribution line according to the invention of claim 2 is characterized in that, in the invention of claim 1, each low-voltage single-phase voltage input by the low-voltage voltage input means is different from one phase of the high-voltage single-phase voltage. It is characterized by comprising a low-voltage line connection phase confirmation means for judging that the two-phase.

  According to a third aspect of the present invention, there is provided a disconnection detecting device for a high-voltage distribution line according to the first or second aspect, wherein the high-voltage single-phase voltage input by the high-voltage voltage input means is based on a command from a central controller. Is a voltage for phase detection and charge / power failure judgment input to a remote controller that opens and closes, and the low-voltage single-phase voltage input by the low-voltage voltage input means is a voltage for the power supply of the remote controller It is characterized by.

  The disconnection detecting device for a high voltage distribution line according to the invention of claim 4 is the invention according to any one of claims 1 to 3, wherein the disconnection determining means determines that the disconnection occurs when any of the following conditions is satisfied. It is characterized by that.

(1) When the high-voltage single-phase voltage and the low-voltage single-phase voltage are in phase or reverse phase.

(2) When the switch is closed, the phase of the high-voltage single-phase voltage on both the power supply side and the load side is unknown and the low-voltage single-phase voltage on both the power supply side and the load side is present.

(3) When the switch is open and the phase detection is unknown between the high-voltage single-phase voltage and the low-voltage single-phase voltage on the power supply side or load side, and the low-voltage single-phase voltage on the phase detection unknown side is present.

(4) The switch is open, the phase of the high-voltage single-phase voltage on the power supply side or load side and the low-voltage single-phase voltage is unknown, and the high-voltage single-phase voltage on the power-supply side and the high-voltage single-phase voltage on the load side are out of phase. One day.

  The disconnection detecting device for a high-voltage distribution line according to the invention of claim 5 is characterized in that the low-voltage line connection phase confirmation means determines whether it is normal, abnormal or indeterminate under the following conditions.

(1) The high-voltage single-phase voltage and the low-voltage single-phase voltage on the power supply side and the load side are different from each other, and the low-voltage single-phase voltage on the power-supply side and the low-voltage single-phase voltage on the load side are different from each other. Is determined to be normal when the load and the high-voltage single-phase voltage on the load side are in phase.

(2) The high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side are in phase, and the high-voltage single-phase voltage on the power supply side or load side and the low-voltage single-phase voltage on either the power supply side or load side are in phase It is determined that there is an abnormality when the high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side are in phase, and the low-voltage single-phase voltage on the power supply side and the single-phase voltage on the load side are in phase. .

(3) Either the high-voltage single-phase voltage on the power supply side or the load side is unknown, or the low-voltage single-phase voltage on the power supply side or the load side is unknown, or the high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side When the phase voltage is out of phase, it is determined that the determination is impossible.

  According to the present invention, the high-voltage distribution is based on the high-voltage single-phase voltage of any one of the high-voltage three-phase voltages and the other two-phase low-voltage single-phase voltages different from one phase of the high-voltage single-phase voltage. Since wire breakage is detected, the voltage from the voltage detector for phase detection input to the existing remote controller can be used for the high-voltage three-phase voltage, and the low-voltage single-phase voltage is used for the power supply of the remote controller. Therefore, it is not necessary to provide a new voltage detector. Moreover, since the disconnection of a high voltage distribution line is detected based on the phase relationship between a high voltage single phase voltage and a low voltage single phase voltage, high voltage detection accuracy is not required.

  In addition, since it is determined that the low-voltage single-phase voltage extracted from the single-phase transformer is another two-phase different from one phase of the high-voltage single-phase voltage, an error in connection of the single-phase transformer can be prevented. .

  Embodiments of the present invention will be described below. FIG. 1 is a block diagram of a disconnection detecting device 11 for a high voltage distribution line according to the first embodiment of the present invention. In FIG. 1, the disconnection detecting device 11 is incorporated in a remote controller 12 installed in the high voltage distribution line. The case where it comprises is shown. The remote controller 12 opens and closes the switch 14 based on a command from a central controller (not shown). The high-voltage distribution line 13 is a three-phase (U-phase, V-phase, W-phase) distribution line, and a switch 14 is connected thereto. Now, suppose that electric power is supplied from the left side to the right side of the switch 14, and the left side of the switch 14 is called a power source side and the right side is called a load side.

  A remote controller 12 is provided together with the switch 14, and the switch 14 is provided with voltage detectors (PD) 15 a and 15 b for detecting voltages on the power supply side and the load side. This is to obtain information (phase information and charging / discharging information) necessary for remote control of the remote controller 12. That is, the voltage detectors 15a and 15b take out a high-voltage single-phase voltage from two phases (for example, the U phase and the W phase) in the three-phase voltage, and the high voltage on the power source side and the load side is detected by the phase detector 16 of the remote controller 12. It is determined whether or not the phase of the voltage is in phase. This is because, when the switch 14 is closed, if the phases of the power supply side and the load side do not match, a large voltage fluctuation occurs, which is prevented. In addition, the high-voltage single-phase voltage is taken out from two phases (for example, the U phase and the W phase) in the three-phase voltage. This is because it is sufficient.

  On the other hand, the remote controller 12 is configured to be supplied with power from the single-phase transformers 17a and 17b on the power supply side and load side of the switch 14 connected to the high-voltage distribution line 13. That is, the voltage of the high-voltage distribution line 13 is stepped down by the single-phase transformers 17 a and 17 b to obtain a low-voltage single-phase voltage and supplied to the power supply unit 18 of the remote controller 12.

  In the first embodiment of the present invention, the high-voltage single-phase voltage detected by the voltage detectors 15a and 15b for phase detection, and the single-phase transformer 17a taken in as the power source of the remote controller 12 are provided. Since the disconnection of the high-voltage distribution line 13 is detected using the low-voltage single-phase voltage obtained in 17b, when the high-voltage single-phase voltage is U-W, the connection phase of the single-phase transformers 17a and 17b is V- Remove from W, U-V. Thereby, UW, VW, and UV which are the voltage between the three-phase lines of the high voltage distribution line 13 can be obtained. In this way, one phase (U-W) of the high-voltage single-phase voltage and the other two phases (V-W, U-V) respectively different from each other are stepped down by the single-phase transformers 17a, 17b, respectively, and the low-voltage distribution line A single phase voltage is supplied to the power supply unit 18 of the remote controller 12.

  In addition, the transport unit 20 of the remote controller 12 transmits and receives the transport signal transported to the high-voltage distribution line 13 via the high-voltage couplers 19a and 19b connected to the power supply side and the load side of the high-voltage distribution line 13. A command from a central control device (not shown) is output to the control calculation unit 21 and information including the open / close state of the switch 14 in the control calculation unit 21 is transmitted to the central control device.

  The disconnection detecting device 11 inputs a high-voltage single-phase voltage of one phase on each of the power source side and the load side of the switch 14 detected by the voltage detectors 15a and 15b by the high-voltage voltage input means 22, and a single-phase transformer 17a. , 17b, the other two-phase low-voltage single-phase voltages different from one phase of the high-voltage single-phase voltage stepped down by 17b are input by the low-voltage voltage input means 23. The disconnection determination unit 24 detects disconnection of the high-voltage distribution line 13 based on the phase relationship between the high-voltage single-phase voltage input by the high-voltage voltage input unit 22 and the low-voltage single-phase voltage input by the low-voltage voltage input unit 23. The determination result of the disconnection in the disconnection determination means 24 is transmitted to the central controller through the transport unit 20. Note that the disconnection determination result may be displayed on the display unit 25. The display unit 25 displays whether or not the remote controller is abnormal and other necessary information.

  FIG. 2 is a block diagram of the disconnection determination logic in the disconnection determination means 24. The disconnection determination means 24 receives the U-W voltage (high-voltage power supply side) and the U-W voltage (high-voltage load side) from the high-voltage voltage input means 22, and the V-W voltage (low-voltage power supply side) from the low-voltage voltage input means 23. ) And U-V voltage (low voltage load side) are input. The disconnection determination means 24 is based on the phase relationship between the U-W voltage (high-voltage power supply side), the U-W voltage (high-voltage load side), the V-W voltage (low-voltage power supply side), and the U-V voltage (low-voltage load side). The disconnection of the high-voltage distribution line is determined. The disconnection determination means 24 determines that a disconnection occurs when any of the following conditions (1) to (4) is satisfied.

(1) When the high-voltage single-phase voltage and the low-voltage single-phase voltage are in phase or reverse phase.

  The disconnection determination means 24 is used when the high-voltage single-phase voltage (U-W voltage) on the power supply side and the low-voltage single-phase voltage (V-W voltage) on the power supply side are in reverse phase, or on the high-voltage single-phase voltage (U -W voltage) and low-voltage single-phase voltage (U-V voltage) on the load side are in phase, it is determined that the wire is disconnected.

  FIG. 3 is a voltage vector diagram on the power supply side and the load side in which the high-voltage single-phase voltage and the low-voltage single-phase voltage are in phase or reverse phase at the time of disconnection, and FIG. FIG. 3B is a voltage vector diagram, and FIG. 3B is a voltage vector diagram on the power supply side and the load side when a disconnection occurs in the U phase.

  In a healthy state, as shown in FIG. 3A, on the power source side, the low-voltage single-phase voltage (V-W voltage) has a phase angle of 120 ° with respect to the high-voltage single-phase voltage (U-W voltage), and the load On the side, the low-voltage single-phase voltage (U-V voltage) has a phase angle of 240 ° with respect to the high-voltage single-phase voltage (U-W voltage).

  On the other hand, when disconnection occurs in the U phase, the U phase shifts to the V-W voltage. Therefore, as shown in FIG. 3B, on the power supply side, the low-voltage single-phase voltage (V-W voltage) has a phase angle of 180 ° (reverse phase) with respect to the high-voltage single-phase voltage (U-W voltage). On the load side, the low-voltage single-phase voltage (U-V voltage) has a phase angle of 0 ° (in phase) with respect to the high-voltage single-phase voltage (U-W voltage).

  Thus, when a disconnection occurs, two line voltages (U-W voltage, U-V voltage) related to the disconnection phase (U phase) are in the same direction as the line voltage (V-W voltage) of the healthy phase or The reverse direction. That is, the phase difference between the high-voltage single-phase voltage (U-W voltage) and the low-voltage single-phase voltage (U-V voltage and V-W voltage) is compared. At this time, if the load is unbalanced and the U-W voltage is extremely small of the two line voltages (U-W voltage, U-V voltage) related to the disconnection phase (U-phase), the high-voltage single phase The phase difference between the voltage (U-W voltage) and the low-voltage single-phase voltage (U-V voltage and V-W voltage) cannot be compared. In that case, the disconnection can be detected by the method of the next item (2). Further, the present invention can be applied to any case where the switch is opened (off) and closed (on). That is, the phase comparison UV between the high-voltage single-phase voltage (W-U voltage) on the power supply side and the load side and the low-voltage single-phase voltage (U-V voltage or V-W voltage) on the power supply side and the load side, Since the phase comparison is performed by crossing the high-voltage single-phase voltage and the low-voltage single-phase voltage on each of the power supply side and the load side, the open / close state of the switch 14 can be determined regardless. That is, the present invention can be applied to any case where the switch is opened (off) and closed (on), and can be determined for both the normally open switch 14 and the normally closed switch.

(2) When the switch 14 is closed (on), the phase detection of the high-voltage single-phase voltage on both the power supply side and the load side and the low-voltage single-phase voltage is unknown, and the low-voltage single-phase voltage on both the power supply side and the load side is When there is.

  When the switch 14 is in the closed (on) state, the disconnection determining means 24 has a small value of the high-voltage single-phase voltage (W-U voltage) on both the power supply side and the load side, and the high-voltage single unit on the power supply side and the load side. When phase detection (phase determination) U-V between phase voltage (W-U voltage) and low-voltage single-phase voltage (V-WU-V voltage and V-W voltage) on the power supply side and load side is not possible (phase detection unknown) ), The low-voltage single-phase voltage (V-W voltage) on the power supply side and the low-voltage single-phase voltage (U-V voltage) on the load side are “present”, and it is determined that a disconnection has occurred.

  FIG. 4 is a voltage vector diagram on the power supply side and the load side in which the switch 14 is closed (on), the high-voltage single-phase voltage is “none” and the low-voltage single-phase voltage is “present” when disconnected. FIG. 4A is a voltage vector diagram on the power supply side and the load side in a healthy state, and FIG. 4B is a voltage vector diagram on the power supply side and the load side when a disconnection occurs in the U phase.

  In a healthy state, as shown in FIG. 4 (a), on the power supply side, the low-voltage single-phase voltage (V-W voltage) has a phase angle of 120 ° with respect to the high-voltage single-phase voltage (U-W voltage), and the load On the side, the low-voltage single-phase voltage (U-V voltage) has a phase angle of 240 ° with respect to the high-voltage single-phase voltage (U-W voltage).

  On the other hand, if the disconnection occurs in the U phase when the switch 14 is in the closed (on) state, the U phase shifts to the V-W voltage as shown in FIG. High-voltage single-phase voltage (U-W voltage) is small, high-voltage single-phase voltage (U-W voltage) on the power supply side and load side, and low-voltage single-phase voltage (V-WU-V-V) on the power supply side and load side Voltage and V-W voltage) may not be performed.

  Thus, when the high-voltage single-phase voltage (U-W voltage) becomes a very small voltage at the time of disconnection due to load imbalance, phase detection at high and low pressure cannot be performed, and disconnection cannot be detected. Therefore, it is determined that the wire is disconnected when the two low-voltage single-phase voltages (V-W voltage, U-V voltage) are valid. That is, since the low-voltage single-phase voltage (V-W voltage) on the power supply side and the low-voltage single-phase voltage (U-V voltage) on the load side are “present”, it is determined that a disconnection has occurred.

(3) When the switch is open (off), the phase detection between the high-voltage single-phase voltage on the power supply side or the load side and the low-voltage single-phase voltage is unknown, and the low-voltage single-phase voltage on the phase detection unknown side is present.

  When the switch 14 is in an open (off) state, the disconnection determination means 24 is configured to supply a high-voltage single-phase voltage (W-U voltage) on the power supply side and the load side and a low-voltage single-phase voltage (U-V) on the power supply side and the load side. Voltage and V-W voltage), and when there is a low-voltage single-phase voltage on the phase detection unknown side, it is determined that a disconnection has occurred.

  FIG. 5 is a voltage vector diagram on the power supply side and the load side when the switch is open (off), the high-voltage single-phase voltage on the power-supply side is “none” and the low-voltage single-phase voltage is “present” when the switch is disconnected. FIG. 5A is a voltage vector diagram on the power supply side and the load side in a healthy state, and FIG. 5B is a voltage vector diagram on the power supply side and the load side when a disconnection occurs in the U phase on the power supply side.

  In a healthy state, as shown in FIG. 5 (a), on the power supply side, the low-voltage single-phase voltage (V-W voltage) has a phase angle of 120 ° with respect to the high-voltage single-phase voltage (U-W voltage), and the load On the side, the low-voltage single-phase voltage (U-V voltage) has a phase angle of 240 ° with respect to the high-voltage single-phase voltage (U-W voltage).

  On the other hand, when the switch 14 is in the open (off) state, the power supply side and the load side are operated independently, so that when the disconnection is disconnected, the high-voltage single-phase voltage (U-W voltage) on the power supply side and the high-voltage single on the load side are The phase voltage (U-W voltage) is not the same.

  Assuming that a disconnection has occurred in the U phase on the power supply side, as shown in FIG. 5B, the voltage vector at the time of soundness is maintained on the load side, and a disconnection has occurred in the U phase on the power supply side. Accordingly, the U-phase voltage on the power supply side shifts to the V-W voltage, but depending on the load state, the value of the high-voltage single-phase voltage (U-W voltage) on the power supply side is small, and the high-voltage single-phase voltage (U -W voltage) and low-voltage single-phase voltage (V-W voltage) on the power source side may not be detected. In this case, it is determined that a disconnection has occurred because the low-voltage single-phase voltage (V-W voltage) on the power source side that cannot perform phase detection is “present”.

  Similarly, when a disconnection occurs in the U phase on the load side, it is similarly determined that a disconnection has occurred because the load-side low-voltage single-phase voltage (U-V voltage) that cannot be phase-detected is “present”.

(4) The switch is open, the phase of the high-voltage single-phase voltage on the power supply side or load side and the low-voltage single-phase voltage is unknown, and the high-voltage single-phase voltage on the power-supply side and the high-voltage single-phase voltage on the load side are out of phase. One day.

  The disconnection determining means 24 detects the phase of the high-voltage single-phase voltage (U-W voltage) on the power source side and the low-voltage single-phase voltage (V-W voltage) on the power source side when the switch 14 is open (cut). Unknown or phase detection unknown between high-voltage single-phase voltage (U-W voltage) on load side and low-voltage single-phase voltage (U-V voltage) on load side, and high-voltage single-phase voltage (U-W voltage) on power supply side And a high-voltage single-phase voltage (U-W voltage) on the load side make a phase difference of 60 °, it is determined that a disconnection has occurred.

  FIG. 6 is a voltage vector diagram on the power supply side and the load side when the switch is open (off), the low-voltage single-phase voltage on the power-supply side is “none”, and the high-voltage single-phase voltage is “present” at the time of disconnection. FIG. 6A is a voltage vector diagram on the power supply side and the load side in a healthy state, and FIG. 6B is a voltage vector diagram on the power supply side and the load side when a disconnection occurs in the U phase on the power supply side.

  In a healthy state, as shown in FIG. 6A, on the power source side, the low-voltage single-phase voltage (V-W voltage) has a phase angle of 120 ° with respect to the high-voltage single-phase voltage (U-W voltage), and the load On the side, the low-voltage single-phase voltage (U-V voltage) has a phase angle of 240 ° with respect to the high-voltage single-phase voltage (U-W voltage).

  On the other hand, when the switch 14 is in the open (off) state, the power supply side and the load side are operated independently, so that when the disconnection is disconnected, the high-voltage single-phase voltage (U-W voltage) on the power supply side and the high-voltage single on the load side are The phase voltage (U-W voltage) is not the same.

  Assuming that a disconnection occurs in the U phase on the power supply side, as shown in FIG. 6B, the voltage vector in the healthy state is maintained on the load side, and the disconnection occurs in the U phase on the power supply side. As a result, the U phase on the power supply side shifts to the V-W voltage. However, depending on the load state, the value of the low voltage single phase voltage (UV voltage) on the power supply side is small, and the high voltage single phase voltage (U- (W voltage) and low-voltage single-phase voltage (V-W voltage) on the power supply side may not be detected.

  In this case, since the high-voltage single-phase voltage (U-W voltage) on the power supply side is “present”, the high-voltage single-phase voltage (U-W voltage) on the power-supply side and the high-voltage single-phase voltage (U-W on the load side) When the W voltage has a phase difference of 60 °, it is determined that a disconnection has occurred. In other words, the high-voltage single-phase voltage (U-W voltage) on the power source side where the disconnection has occurred is advanced by 60 ° in phase angle with respect to the high-voltage single-phase voltage (U-W voltage) at the time of sound, so The disconnection is determined by phase comparison with the high-voltage single-phase voltage (U-W voltage).

  In the above description, the case where the disconnection occurs in the U phase has been described. However, the present invention can be similarly applied to the case where a disconnection occurs in the V phase and the W phase. When the switch 14 is closed (turned on), the load is completely balanced by the disconnection of the V phase common to the power supply to the remote controller 12 (VW voltage, UV voltage). In this case, since the low voltage supplied to the remote controller 12 is halved, the remote controller 12 may stop. In this case, the disconnection can be detected by stopping the apparatus.

  In addition, if the low-voltage single-phase voltage becomes extremely small due to the extreme imbalance of the load due to the V-phase disconnection on one side of the normally open (off) switch 14, the disconnection cannot be determined by phase detection. Although there is a single-phase voltage, there is no low-voltage single-phase voltage. Such a state is determined to be abnormal by the self-diagnosis logic of the remote control device 12, so that the disconnection can be detected by the action of the self-diagnosis logic.

  According to the first embodiment, the disconnection determination means 24 is a high-voltage unit from the voltage detectors 15a and 15b that detects the high-voltage single-phase voltage of the high-voltage distribution line 13 provided for phase detection of the remote controller 12. Since the low-voltage single-phase voltage on the power supply side and the load side taken in for the phase voltage and the power supply of the remote controller 12 is used, it is not necessary to newly provide a voltage detector for disconnection detection, and disconnection detection can be performed. . In addition, since disconnection detection is performed based on the phase relationship between the high-voltage single-phase voltage and the low-voltage single-phase voltage, it is not necessary to have high-sensitivity voltage detection, so that an existing voltage detector can be used as it is.

  Next, a second embodiment of the present invention will be described. FIG. 7 is a block diagram of a high voltage distribution line disconnection detection apparatus 11 according to the second embodiment of the present invention. In FIG. 7, the disconnection detection apparatus 11 is incorporated in the remote controller 12 installed in the high voltage distribution line. The case where it comprises is shown. This second embodiment is different from the first embodiment shown in FIG. 1 in that each low-voltage single-phase voltage input by the low-voltage voltage input means 23 is different from one phase of the high-voltage single-phase voltage. A low-voltage line connection phase confirmation means 26 for determining that the two phases are present is additionally provided. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 7, the disconnection detection device 11 is additionally provided with a low-voltage line connection phase confirmation means 26. The low-voltage line connection phase confirmation means 26 inputs the low-voltage single-phase voltage from the power-supply-side single-phase transformer 17a and the low-voltage single-phase voltage from the load-side single-phase transformer 17b via the low-voltage input means 23. One phase (U-W) of the high-voltage single-phase voltage is input via the high-voltage voltage input means 22, and each of the low-voltage single-phase voltages is different from the one-phase (U-W) of the high-voltage single-phase voltage. It is determined whether or not (V-W, U-V).

  That is, in determining the disconnection, U-W, V-W, and U-V, which are the three-phase line voltages of the high-voltage distribution line 13, are necessary. The phase sequence of the low-voltage single-phase voltage taken out by the single-phase transformer 17b is important, and whether or not the V-W and U-V that are the three-phase line voltages of the high-voltage distribution line 13 are taken out is checked. Do.

  The low-voltage line connection phase confirmation means 26 determines that it is normal when the following condition (1) is satisfied, determines that it is abnormal when it is the condition (2), and determines that determination is impossible when it is the condition (3).

(1) The high-voltage single-phase voltage and the low-voltage single-phase voltage on the power supply side and the load side are different from each other, and the low-voltage single-phase voltage on the power-supply side and the low-voltage single-phase voltage on the load side are different from each other. Is determined to be normal when the load and the high-voltage single-phase voltage on the load side are in phase.

  FIG. 8 is a voltage vector diagram on the power supply side and the load side when it is determined normal by the low-voltage line connection phase confirmation means 26. When normally connected, the voltage vector is the same as that shown in FIG. 3A. On the power supply side, the low-voltage single-phase voltage (V-W voltage) is higher than the high-voltage single-phase voltage (U-W voltage). The phase angle is 120 °. On the load side, the low-voltage single-phase voltage (U-V voltage) is 240 ° with respect to the high-voltage single-phase voltage (U-W voltage).

(2) The high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side are in phase, and the high-voltage single-phase voltage on the power supply side or load side and the low-voltage single-phase voltage on either the power supply side or load side are in phase It is determined that there is an abnormality when the high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side are in phase, and the low-voltage single-phase voltage on the power supply side and the single-phase voltage on the load side are in phase. .

  FIG. 9 is a voltage vector diagram on the power source side and the load side when the low voltage line connection phase confirmation means 26 determines that an abnormality has occurred. As shown in FIG. 9A, for example, the high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side are in phase, and the high-voltage single-phase voltage on the load side and low-voltage single-phase voltage on the load side are in phase. Is determined as abnormal. This is because when a high-voltage single-phase voltage on the power supply side and a high-voltage single-phase voltage on the load side are in phase, there is a low-voltage single-phase voltage that is in phase with the high-voltage single-phase voltage. This is because the input is missing. Similarly, an abnormality is also determined when the high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side are in phase, and the high-voltage single-phase voltage on the power supply side and the low-voltage single-phase voltage on the power supply side are in phase.

  As shown in FIG. 9B, when the high-voltage single-phase voltage on the power source side and the high-voltage single-phase voltage on the load side are in phase, and the low-voltage single-phase voltage on the power source side and the single-phase voltage on the load side are in phase Determined as abnormal. This is because when the high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side are in phase, there is a low-voltage single-phase voltage that is in phase with each other. Because it will be.

(3) Either the high-voltage single-phase voltage on the power supply side or the load side is unknown, or the low-voltage single-phase voltage on the power supply side or the load side is unknown, or the high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side When the phase voltage is out of phase, it is determined that the determination is impossible.

  FIG. 10 is a voltage vector diagram on the power supply side and the load side when it is determined by the low voltage line connection phase confirmation means 26 that determination is impossible. As shown in FIG. 10 (a), for example, when there is no high-voltage single-phase voltage and low-voltage single-phase voltage on the power supply side, Since the high-voltage single-phase voltage or the low-voltage single-phase voltage corresponds to unknown, it is determined that the determination is impossible. This is because when maintenance work is being performed on the distribution line on the power supply side, the maintenance section may be disconnected, and in that case, there is no voltage generation and the connection status of the single-phase transformer cannot be determined. It is.

  Further, as shown in FIG. 10B, when the high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side are different from each other, it is determined that the determination is impossible. When the switch 14 is normally open (off), even if the connection of the single-phase transformers 17a and 17b is normal, the phase difference between adjacent distribution lines may be greatly shifted (different phase). In such a case, the disconnection detection unit 24 of the disconnection detection device 11 may erroneously detect disconnection, so that the disconnection detection unit 24 does not work in a different phase state.

  The connection state determination result of the single-phase transformers 17a and 17b in the low-voltage phase connection confirmation unit 26 is displayed and output to the display unit 25.

  According to the second embodiment, in addition to the effects of the first embodiment, the connection state of the low-voltage distribution lines on the secondary side of the single-phase transformers 17a and 17b is confirmed and determined by the connection phase confirmation means 26. Further, it is possible to prevent erroneous determination of the disconnection determination means 24 due to erroneous connection of the single-phase transformers 17a and 17b.

The block block diagram of the disconnection detection apparatus of the high voltage distribution line concerning the 1st Embodiment of this invention. The block diagram of the disconnection determination logic in the disconnection determination means in the 1st Embodiment of this invention. In the 1st Embodiment of this invention, the voltage vector figure of the power source side and load side from which a high voltage | pressure single phase voltage and a low voltage | pressure single phase voltage become an in-phase or a reverse phase at the time of a disconnection. In the first embodiment of the present invention, the voltage vector diagram on the power supply side and the load side when the switch is closed (on), the high-voltage single-phase voltage is “none”, and the low-voltage single-phase voltage is “present” at the time of disconnection . In the first embodiment of the present invention, when the switch is open (off), the high-voltage single-phase voltage on the power-supply side is “none” and the low-voltage single-phase voltage is “present” at the time of disconnection. Voltage vector illustration. In the first embodiment of the present invention, when the switch is open (off), the low-voltage single-phase voltage on the power supply side is “none” and the high-voltage single-phase voltage is “present” and the load-side Voltage vector illustration. The block block diagram of the disconnection detection apparatus of the high voltage distribution line concerning the 2nd Embodiment of this invention. The voltage vector figure of the power supply side and load side in the case of being judged normal by the low voltage | pressure line connection phase confirmation means in the 2nd Embodiment of this invention. The voltage vector figure of the power supply side and load side in case it is judged that it is abnormal by the low voltage | pressure line connection phase confirmation means in the 2nd Embodiment of this invention. The voltage vector figure of the power supply side and load side in the case of determining with the low voltage line connection phase confirmation means in the 2nd Embodiment of this invention being undecidable.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Disconnection detection apparatus, 12 ... Remote controller, 13 ... High voltage distribution line, 14 ... Switch, 15 ... Voltage detector, 16 ... Phase detection part, 17 ... Single phase transformer, 18 ... Power supply part, 19 ... High voltage Coupler, 20 ... Conveying section, 21 ... Control operation section, 22 ... High voltage input means, 23 ... Low voltage input means, 24 ... Disconnection determination means, 25 ... Display section, 26 ... Low voltage line connection phase confirmation means

Claims (5)

High-voltage voltage input means for inputting one-phase high-voltage single-phase voltage from the power-supply-side three-phase voltage and load-side three-phase voltage of the switch connected to the high-voltage distribution line; Low-voltage voltage input means for stepping down the other two phases different from one phase of the high-voltage single-phase voltage from the load-side three-phase voltage by a single-phase transformer and inputting the low-voltage single-line voltage of the low-voltage distribution line, and the high voltage A disconnection determining means for detecting disconnection of the high-voltage distribution line based on a phase relationship between the high-voltage single-phase voltage input by the voltage input means and the low-voltage single-phase voltage input by the low-voltage voltage input means. Disconnection detector for high voltage distribution lines. Low voltage line connection phase confirmation means for judging that each low voltage single phase voltage input by the low voltage voltage input means is another two phase different from one phase of the high voltage single phase voltage is provided. The disconnection detecting device for a high-voltage distribution line according to claim 1. The high-voltage single-phase voltage input by the high-voltage voltage input means is a voltage for phase detection and charge / power failure determination input to a remote controller that opens and closes the switch based on a command from a central controller, 3. The disconnection detecting device for a high-voltage distribution line according to claim 1, wherein the low-voltage single-phase voltage input by the low-voltage voltage input means is a voltage for a power source of the remote controller. The disconnection detection device for a high-voltage distribution line according to any one of claims 1 to 3, wherein the disconnection determination means determines that the disconnection occurs when any of the following conditions is satisfied.
(1) When the high-voltage single-phase voltage and the low-voltage single-phase voltage are in phase or reverse phase.
(2) When the switch is closed, the phase of the high-voltage single-phase voltage on both the power supply side and the load side is unknown and the low-voltage single-phase voltage on both the power supply side and the load side is present.
(3) When the switch is open and the phase of the high-voltage single-phase voltage and the low-voltage single-phase voltage on the power supply side or load side is unknown and the low-voltage single-phase voltage on the phase unknown side is present.
(4) The switch is open, the phase of the high-voltage single-phase voltage on the power supply side or load side is unknown, and the high-voltage single-phase voltage on the power supply side is different from the high-voltage single-phase voltage on the load side. One day. 5. The disconnection detecting device for a high-voltage distribution line according to claim 2, wherein the low-voltage line connection phase confirmation means makes a determination as normal, abnormal, or impossible to determine under the following conditions.
(1) The high-voltage single-phase voltage and the low-voltage single-phase voltage on the power supply side and the load side are different from each other, and the low-voltage single-phase voltage on the power-supply side and the low-voltage single-phase voltage on the load side are different from each other. Is determined to be normal when the load and the high-voltage single-phase voltage on the load side are in phase.
(2) The high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side are in phase, and the high-voltage single-phase voltage on the power supply side or load side and the low-voltage single-phase voltage on either the power supply side or load side are in phase It is determined that there is an abnormality when the high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side are in phase, and the low-voltage single-phase voltage on the power supply side and the single-phase voltage on the load side are in phase. .
(3) Either the high-voltage single-phase voltage on the power supply side or the load side is unknown, or the low-voltage single-phase voltage on the power supply side or the load side is unknown, or the high-voltage single-phase voltage on the power supply side and the high-voltage single-phase voltage on the load side When the phase voltage is out of phase, it is determined that the determination is impossible.

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