JP6077361B2 - Pillar transformer with automatic tap switching function - Google Patents

Description

  The present invention relates to a pole transformer with an automatic tap switching function that is attached to a utility pole in a distribution system.

  In recent years, a large number of distributed power sources such as solar power generation facilities are connected to a power distribution system. When power is reversely transmitted from the distributed power source to the distribution line, the distribution line voltage rises, so if the number of distributed power sources connected increases, the distribution line voltage rises out of the appropriate voltage range and may adversely affect the load. There is.

  FIG. 7A schematically shows the configuration of the power distribution system. In the figure, 1 is a substation, 2 is a high voltage distribution line connected to the secondary side of the transformer of the substation 1 via a circuit breaker (not shown), and 3 is a high voltage for adjusting the voltage of the high voltage distribution line. Automatic voltage regulator, Tr1 is a pole transformer to transform the primary side distribution line voltage of the high voltage automatic voltage regulator 3 from high voltage to low voltage, Tr2 is the secondary distribution voltage of the high voltage automatic voltage regulator 3 4 is a load connected to the secondary side of the pole transformer Tr1 through the low voltage distribution line DL1, and 5 is a low voltage distribution to the secondary side of the pole transformer Tr2. It is a load connected through the electric wire DL2. Reference numeral 6 denotes a distributed power source such as a photovoltaic power generation facility connected to the low-voltage distribution line DL2 connected to the secondary side of the pole transformer Tr2.

  FIG. 7B shows the voltages of the respective parts of the low-voltage distribution line DL2 connecting the pole transformer Tr2 and the load 5 shown in FIG. In the figure, point A shows the end of the low-voltage distribution line DL2 on the transformer Tr2 side, and point B shows the end of the distribution line on the load 5 side. In FIG. 7B, V1 indicates the lower limit value of the appropriate range (101 ± 6 volts) of the voltage of the low-voltage distribution line, and V2 indicates the upper limit value of the appropriate range. Since the voltage of the low-voltage distribution line DL2 changes as the connected load increases or decreases, as shown by the broken line in FIG. 7B, when the load increases, the voltage is distributed at the end of the low-voltage distribution system. The wire voltage may fall below the lower limit voltage V1 of the appropriate voltage range. Therefore, by adjusting the voltage on the high voltage side by the high voltage automatic voltage regulator 3 and switching the tap of the pole transformer Tr2, the distribution line voltage is maintained within the proper range as shown by the solid line in FIG. 7B. I have to. However, when the distributed power supply 6 is connected to the low-voltage distribution line DL2, when power is sent back from the distributed power supply 6 to the distribution line, the distribution line voltage is at the upper limit of the appropriate range as shown in FIG. The value V2 may be exceeded.

  In order to prevent such a situation from occurring, as shown in FIG. 8A, a distributed power source is connected to a pole transformer 7 having an automatic tap switching function in which the pole transformer has an automatic voltage adjustment function. It connects to the appropriate location of the low voltage distribution line DL2 to be adjusted, and the distribution line voltage is adjusted.

  In the example shown in FIG. 8, a pole transformer that does not have an automatic tap switching function as a pole transformer that transforms the primary distribution line voltage of the high voltage automatic voltage regulator 3 and applies it to the low voltage distribution line DL1. Tr1 is used, but when the distributed power supply is connected to the low-voltage distribution line DL1, there is a risk that the distribution line voltage may exceed the upper limit of the appropriate range, the transformer Tr1 can also be an automatic tap switching function. A pole-mounted transformer is used.

  The pole transformer 7 with the automatic tap switching function switches the tap-equipped transformer having a plurality of taps and the energizing tap (tap for energization) of the tapped transformer to the tap selected according to the tap switching command. A pole transformer body that houses the tap changer in the tank, and a control unit that gives a tap change command to the tap changer so that the distribution line voltage on the secondary side of the transformer with tap is within the set adjustment range. A control device that accommodates the components in a control box attached to the outside of the tank, and switches the tap of the transformer with the tap according to the distribution line voltage on the secondary side of the installation location, It acts to prevent the distribution line voltage on the secondary side from deviating from the proper range. In the state shown in FIG. 8B, the secondary side voltage of the pole transformer 7 with automatic tap switching function has risen too much, and the voltage at the end of the distribution line may exceed the appropriate range. The pole transformer 7 with an automatic tap switching function switches the tap to a step-down tap (a tap on the side where the secondary voltage of the transformer with the tap is stepped down) to lower the secondary voltage.

  The pole transformer with automatic tap switching function has the function to adjust the distribution line voltage by automatically switching the tap according to the secondary side distribution line voltage. There is no function to manually operate the instrument from the outside.

  For example, Patent Literature 1 discloses a pole transformer having a function of manually switching taps according to the load state of an installation location. Product information on pole transformers with automatic tap switching is available on the websites of several companies.

JP 2004-221394 A

  Even if a pole transformer with automatic tap switching function is connected to the distribution line, the number of distributed power sources connected to the distribution line has increased, so the distribution line voltage can be adjusted for the pole transformer with automatic tap switching function. When it rises excessively beyond the range, the distribution line voltage will exceed the appropriate range. When the distribution line voltage is out of the proper range and the customer complains, the cause is that the distribution line voltage rises due to the distributed power source exceeding the adjustment limit of the pole transformer with automatic tap switching function. If it is clear that this is the case, it will be easier to narrow down the measures. However, the conventional pole transformer with automatic tap switching function did not have a function to notify the operating state to the outside, so the cause of the distribution line voltage exceeding the proper range is the pole transformer with automatic tap switching function. It was impossible to detect whether the adjustment function of the vessel had reached its limit or whether there was another cause.

  An object of the present invention is to provide a pole transformer with an automatic tap switching function connected to a distribution line in order to suppress an increase in the distribution line voltage due to interconnection of distributed power sources, etc. The purpose is to provide a function of notifying that the distribution line voltage is out of the proper range.

  The present invention provides a pole-mounted transformer body in which a transformer with a tap having a plurality of taps and a tap changer that switches a tap to be energized to a tap selected according to a tap change command is contained in a tank, The components of the control unit that gives a tap switching command to the tap changer in order to keep the distribution line voltage on the secondary side of the transformer with a tap within a set adjustment range are accommodated in a control box attached to the outside of the tank. And a pole transformer with an automatic tap switching function.

  In the present invention, the alarm display unit attached to the control box or tank in a state that can be confirmed from the ground, the tap position detector that detects the tap selected by the tap switch, and the tap switch selects Tapped transformer secondary voltage exceeds the upper limit of the adjustment range when the tap position detector detects that the tap is the limit tap on the side that steps down the secondary voltage of the tapped transformer. A display control unit is provided that causes the alarm display unit to perform a display operation when the exceeding state continues for a set time.

  As the alarm display unit, for example, a display lamp that displays predetermined display contents by emission color, or a display unit that is disposed inside the display window by opening the display window having a display window that can be opened and closed by a shutter. Provided with a movable display board having a plurality of display parts whose predetermined display contents are indicated by colors or the like, and the predetermined display contents are indicated by moving the movable display board. A mechanical indicator configured to make the display unit visible from the ground through the display window can be used.

  When configured as described above, when the voltage adjustment function of the pole transformer with automatic tap switching function reaches the limit and the distribution line voltage exceeds the appropriate range, it is detected and displayed by the alarm indicator Therefore, when the distribution line voltage exceeds the appropriate range due to the connection of the distributed power supply, whether the cause is that the adjustment function of the pole transformer with automatic tap switching function has reached its limit This information can be obtained with certainty, and the distribution line voltage can be managed appropriately based on the information.

  In the above configuration, a tap position detector that detects the tap selected by the tap changer is provided, and the tap selected by the tap changer limits the voltage on the secondary side of the transformer with a tap. When the tap position detector detects that it is a tap and when the secondary voltage of the tapped transformer exceeds the upper limit of the adjustment range, the alarm display section However, instead of the tap position detector, it is detected that the tap selected by the tap changer is the limit tap on the side that steps down the secondary voltage of the tapped transformer. It is detected that the tap selected by the tap changer is the limit tap on the side for stepping down the secondary voltage of the tapped transformer. Configure the display control unit to cause the alarm display unit to perform the display operation when the secondary voltage of the tapped transformer exceeds the upper limit of the adjustment range for a set time You can also.

  In each of the above embodiments, the tap selected by the tap changer is detected as a limit tap on the side that steps down the secondary voltage of the tapped transformer, and the secondary of the tapped transformer is detected. When the state where the voltage on the side exceeds the upper limit of the adjustment range is continued for the set time, the alarm display unit is made to perform the display operation, but the voltage adjustment function of the pole transformer has reached the limit. In addition, the display operation can be performed even when the distribution line voltage falls below the adjustment range.

  In this case, the first and second alarm display units attached to the control box or tank in a state that can be confirmed from the ground, and the tap position detector or tap changer for detecting the tap selected by the tap changer. Limit that detects that the tap selected by is a limit tap on the side that steps down the secondary side voltage of the tapped transformer and a limit tap on the side that steps up the secondary side voltage of the tapped transformer Tap detector and tap transformer with tap position detector or limit tap detector detecting that the selected tap is a limit tap on the side that steps down the secondary voltage of the tapped transformer. The tap that is selected by causing the first alarm display unit to perform a display operation when the secondary voltage of the detector exceeds the upper limit of the adjustment range for a set time. When the tap position detector or the limit tap detector detects that the tap is a limit tap on the side that boosts the secondary voltage of the transformer, the secondary voltage of the tapped transformer is within the adjustment range. A display control unit is provided that causes the second alarm display unit to perform a display operation when the state below the lower limit continues for a set time.

  In another aspect of the present invention, an abnormality display unit attached to the control box or tank in a state that can be confirmed from the ground is further provided. In this case, when the secondary voltage of the tapped transformer exceeds the upper limit value of the adjustment range, the display control unit determines that the tap selected by the tap changer has the secondary voltage of the tapped transformer. The abnormality display unit is configured to perform a display operation when the tap position detector does not detect that it is a limit tap on the side to be stepped down.

  In yet another aspect of the present invention, a distribution line voltage increase display unit attached to the control box or tank in a state that can be confirmed from the ground is further provided. In this case, the display control unit is configured to cause the distribution line voltage increase display unit to perform a display operation when the secondary voltage of the tapped transformer exceeds the upper limit of the adjustment range.

  In still another aspect of the present invention, a slave station having a function of communicating with a master station installed in the distribution system and a signal including information indicating that the alarm display unit is performing a display operation are transmitted. And a communication control unit that controls the slave station so that the station transmits to the master station.

  When configured in this way, when the distribution line voltage exceeds the appropriate range due to the interconnection of the distributed power supply, the cause is that the adjustment function of the pole transformer with automatic tap switching function has reached its limit This can be known at the installation location of the master station, such as a power company sales office, without going to the installation site of the pole transformer with the automatic tap switching function.

  In still another aspect of the present invention, a slave station having a function of communicating with a master station installed in a distribution system, a tap position detector that detects a tap selected by the tap changer, and a tap It is detected by the tap position detector that the tap selected by the switch is a limit tap on the side where the secondary voltage of the tapped transformer is stepped down, and the secondary voltage of the tapped transformer is adjusted. When a state in which the upper limit of the voltage is exceeded, a signal including information indicating that the voltage adjustment function by the tapped transformer has reached the limit on the step-down side is transmitted from the slave station to the master station. And a communication control unit for controlling the station. In this case, the control box containing the components of the control unit does not necessarily have to be attached to the outside of the transformer tank.

  In yet another aspect of the present invention, the slave station having a function of communicating with the master station installed in the distribution system, and the tap selected by the tap changer is the secondary voltage of the tapped transformer. The limit tap detector that detects that it is the limit tap on the side that steps down the voltage, and the tap selected by the tap changer is the limit tap on the side that steps down the secondary voltage of the tapped transformer The voltage regulation function by the tapped transformer has reached the limit on the step-down side when a condition is detected by the tap detector and the secondary voltage of the tapped transformer exceeds the upper limit of the adjustment range. And a communication control unit for controlling the slave station so as to transmit a signal including information indicating the slave station to the master station.

  In still another aspect of the present invention, the slave station having a function of communicating with the master station installed in the distribution system, information on the tap selected by the tapped transformer, and the tapped transformer And a communication control unit that controls the slave station so that a signal including information on the secondary side voltage is transmitted from the slave station to the master station.

  Even in such a configuration, when the distribution line voltage exceeds the appropriate range due to the interconnection of the distributed power supply, the cause is that the adjustment function of the pole transformer with automatic tap switching function has reached its limit. This can be known at the installation location of the master station, such as a power company sales office, without going to the installation site of the pole transformer with the automatic tap switching function.

  According to the invention described in claim 1 or 2, the voltage adjustment function of the pole transformer with the automatic tap switching function reaches the limit on the step-down side, and the secondary voltage (distribution line voltage) of the transformer is adjusted. When the upper limit of the range is exceeded, it can be detected and the alarm display unit can perform a display operation that can be confirmed from the ground. Can be sure of whether or not the cause is that the adjustment function of the pole transformer with automatic tap switching function has reached its limit, and the distribution line voltage can be managed properly. be able to.

  According to the invention described in claim 3 or 4, the voltage adjustment function of the pole transformer with an automatic tap switching function reaches the limit on the step-down side, and the secondary voltage (distribution line voltage) of the transformer is When the upper limit of the adjustment range is exceeded, not only can the alarm display unit perform display operation, but the voltage adjustment function of the pole transformer with automatic tap switching function has reached the limit on the boost side, and the distribution line Even when the voltage is below the adjustment range, the alarm display unit can perform the display operation, so that the distribution line voltage can be managed more accurately.

  Furthermore, according to the invention described in claim 5, when the step-down-side limit tap detection signal is not generated even though the distribution line voltage exceeds the upper limit value of the adjustment range, a display operation is performed on the abnormality display unit. Since the transformer with automatic tap switching function has some abnormality that can not cope with the rise of the distribution line voltage, the abnormality is displayed and the transformer maintenance management is properly performed. Can do.

  Further, according to the invention described in claim 6, when the secondary side voltage of the transformer with tap exceeds the upper limit of the adjustment range, it is possible to cause the display operation to be performed on the distribution line voltage increase display section, When the distribution line voltage exceeds the upper limit value, not only can it be notified immediately, but the distribution line voltage rise display unit performs the display operation, and the first alarm display unit 31 does not perform the display operation. Sometimes, it can be notified that an abnormality has occurred in the transformer with an automatic tap switching function.

  Furthermore, according to the invention described in any one of claims 7 to 10, the voltage adjustment function of the transformer reaches the limit, and the distribution line voltage exceeds the upper limit of the adjustment range (appropriate range) due to the linkage of the distributed power sources. Since the master station of the distribution system can know that it is in a state, the voltage adjustment function of the transformer has reached its limit without going to the site where the transformer with automatic tap switching function is installed It is possible to promptly perform maintenance management of the distribution system.

It is the side view which showed roughly an example of the external appearance of the pole transformer with an automatic tap switching function which concerns on one Embodiment of this invention. It is the block diagram which showed schematically the structure of the pole transformer with an automatic tap switching function based on the embodiment. It is the connection diagram which showed the structural example of the tap position detector used by embodiment of this invention. It is the connection diagram which showed the structural example of the limit tap detector used in embodiment of this invention. It is the flowchart which showed an example of the algorithm of the process which a microprocessor performs in order to comprise a display control part in embodiment of this invention. It is the flowchart which showed the other example of the algorithm of the process which makes a microprocessor perform in order to comprise a display control part in embodiment of this invention. (A) is a single-line diagram schematically showing the configuration of a distribution system in which pole transformers and distributed power sources are installed, and (B) shows an example of voltage distribution when there is no distributed power source in the distribution system. (C) is a graph showing an example of a voltage distribution when there is a distributed power source in the same distribution system. (A) is a single-line diagram schematically showing the configuration of a distribution system in which a pole transformer with an automatic tap switching function and a distributed power source are installed, and (B) is a state where there is a distributed power source in the distribution system, It is the graph which showed an example of voltage distribution when a pole transformer with an automatic tap change function performed step-down operation. It is the block diagram which showed other embodiment of this invention. It is the block diagram which showed other embodiment of this invention. It is the block diagram which showed other embodiment of this invention. It is the block diagram which showed other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
FIG. 1 shows an example of the appearance of a pole transformer 7 with an automatic tap switching function according to the present invention in a mounted state. In FIG. A pole transformer main body 12 is a control device attached to the pole transformer main body 11.

  As shown in FIG. 2, the pole transformer body 11 includes a tap transformer 13 having a plurality of taps, and a tap switch 14 that switches a tap to be energized to a tap selected according to a tap switching command. And the tap position detector 15 are accommodated in the tank 16.

  The tapped transformer 13 is a single-phase three-wire transformer having primary windings W11 and W12 from which taps are drawn and secondary windings W21 and W22 connected in series with each other. A first position that is one terminal portion of the primary winding W11, a second position that is closer to the other terminal portion side than the first position, and the other terminal portion that is further than the second position The first to third tap terminals t11 to t13 are drawn out from the third position close to the side, respectively, and set in the same manner as the first to third positions of the first primary winding W11. First to third tap terminals t21 to t23 are drawn out from the first position to the third position of the second primary winding W12, respectively.

  The tap terminals drawn from the primary windings W11 and W12 are arranged in the order of t11, t21, t12, t22, t13, t23, and the tap selector TS provided in the tap changer 14 is connected between the tap terminals t11, t21. , T21, t12, t12, t22, t22, t13, and t13, t23 are sequentially connected so that the energization tap of the transformer is switched from the step-down side to the step-up side in five stages. The state in which the tap selector TS is connected between the tap terminals t11 and t21 (the state where the tap selector TS is in the position indicated by the circled number 1) is the step-down side (secondary side distribution line voltage) The state is switched to the limit tap on the step-down side, and the state where the tap selector TS is connected between the tap terminals t13 and t23 (the state where the tap selector TS is at the position indicated by the circled number 5) is the transformer. Is switched to the limit tap on the boosting side (side on which the secondary side distribution line voltage is boosted). A positive phase input terminal P1 + and a negative phase input from a terminal portion opposite to the terminal portion where the tap t11 of the primary winding W11 is provided and a terminal portion opposite to the terminal portion where the tap t21 of the primary winding W12 is drawn out, respectively. Terminal P1- is pulled out, and the primary side distribution line voltage is input between these input terminals. A neutral point terminal N is drawn from a common connection point of the first and second secondary windings W21 and W22, and a positive phase output terminal is connected from a terminal opposite to the common connection point of the secondary windings W21 and W22. P2 + and reverse phase output terminal P2- are drawn out.

  As shown in FIG. 3, the tap position detector 15 includes a movable contact Tc that rotates in conjunction with the tap selector TS, and the tap selector TS is indicated by the numbers 1 to 5 in FIG. When the movable contact Tc comes into contact with the fixed contacts T1 to T5, each of the energizing taps has a first contact when the movable contact Tc comes into contact with the fixed contacts T1 to T5. It is detected that the position has been switched from the tap position to the fifth tap position. When the movable contact Tc contacts the fixed contact T1, the tap position detector 15 generates a step-down-side limit tap detection signal S1 indicating that the energization tap of the transformer has been switched to the step-down-side limit tap. When the contact Tc comes into contact with the fixed contact T5, a boost side limit tap detection signal S5 indicating that the energization tap has been switched to the boost side limit tap is generated. The step-down limit tap detection signal S <b> 1 and the step-up limit tap detection signal S <b> 5 are given to the control device 12 together with the secondary side voltage of the transformer 13.

  The control device 12 includes, on the outside of the tank 16, components of a tap switching control unit that gives a tap switching command to the tap switch 14 so that the secondary distribution line voltage of the transformer 13 with tap is within a set adjustment range. It consists of what was accommodated in the attached control box 20 (refer FIG. 1).

  In the present embodiment, a voltage transformer 21 for detecting the secondary voltage of the tapped transformer 13, which includes an instrument transformer for stepping down the secondary voltage of the tapped transformer 13, is provided. The control box 20 includes a tap switching control unit 22 that gives a tap switching command to the tap changer 14 in accordance with the detected secondary voltage of the tapped transformer so that the detected secondary voltage falls within the adjustment range. The tap switching control unit is configured by these components.

  In the present embodiment, first and second alarm display portions 31 and 32 using light emitting bodies such as lamps and LEDs as display means are attached to the bottom of the control box 20 in a state that can be viewed from the ground. In the present embodiment, as the light emitters constituting the display means of the first and second alarm display sections 31 and 32, those that generate light of different colors such as red and blue are used, When the bottom of the control box 20 is visually observed from the ground, it is possible to easily identify which alarm display unit is performing the display operation by the light emission color.

  Also provided in the control box 20 is a display controller 33 to which the output of the voltage detector 21 and the detection signals S1 and S5 obtained from the tap position detector 15 are input. The display control unit 33 determines that the selected tap is a limit tap on the side where the secondary side voltage of the transformer 13 with a tap is stepped down (the tap selector S is the tap switch indicated by the circled number 1 in FIG. 2) of the tapped transformer 13 detected by the voltage detection unit 21 in a state where the tap position detector 15 detects (the step-down limit tap detection signal S1 is generated). When the state where the secondary voltage exceeds the upper limit of the adjustment range continues for a set time, the first alarm display unit 31 performs a display operation, and the selected tap is the tapped transformer 13. A state in which the tap position detector 15 detects that it is a limit tap on the side that boosts the secondary side voltage (the tap selector S is in the tap switching position indicated by the circled numeral 5 in FIG. 2) ( Boost side limit The second alarm display unit 32 when the secondary voltage of the tapped transformer is below the lower limit of the adjustment range for a set time in a state where the detection signal S5 is generated). Is configured to perform a display operation.

  The display control unit 33 can be configured by providing a microprocessor in the control device and causing the microprocessor to execute a predetermined program. FIG. 5 is a flowchart showing an example of an algorithm of processing executed by the microprocessor to configure the display control unit 33. The process shown in FIG. 5 is repeatedly executed at minute time intervals.

  In the case of the algorithm shown in FIG. 5, it is first determined in step S01 whether or not the step-down limit tap detection signal S1 has been generated. As a result, when it is determined that the step-down-side limit tap detection signal S1 is generated, the process proceeds to step S02 to determine whether or not the secondary voltage of the transformer 13 exceeds the upper limit value V2 of the adjustment range. judge. As a result, when it is determined that the secondary side voltage does not exceed the upper limit value V2 of the adjustment range, the process is terminated without doing anything thereafter. When it is determined in step S02 that the secondary side voltage exceeds the upper limit value V2 of the adjustment range, the process proceeds to step S03 and it is determined whether or not the first flag is set to 1. As a result, if it is determined that the first flag is not set to 1, the process proceeds to step S04, the measured value of the free-run timer is read, and the elapsed time is measured. Next, the process proceeds to step S05, and it is determined whether or not the set time has elapsed since the time when it was first determined that the first flag was not set. As a result, when it is determined that the set time has not elapsed, the process is terminated without doing anything thereafter. If it is determined in step S05 that the set time has elapsed, the process proceeds to step S06, the first flag is set to 1, and then the elapsed time measurement value is reset to 0 in step S07. 1 alarm display unit 31 is driven to perform a display operation. Thereby, the voltage adjustment to the step-down side by the pole transformer with the automatic tap switching function reaches a limit, and the state where the secondary side voltage of the transformer 13 with the tap exceeds the upper limit value of the adjustment range continues. An alarm indicating that In step S08, the first alarm display unit 31 performs a display operation, and then the process ends.

  In step S01, it is determined that the step-down limit tap detection signal S1 is generated, and in step S02, it is determined that the secondary voltage exceeds the upper limit value V2, and then the first flag is set to 1 in step S03. If it is determined that the first alarm display unit 31 has already been driven, the process proceeds to step S08 to drive the first alarm display unit 31 and continue the display operation.

  When it is determined in step S02 that the step-down limit tap detection signal S1 is not generated, the process proceeds to step S09, the first flag is reset to 0, and then the step-up limit tap detection signal S5 is generated in step S10. It is determined whether or not. As a result, when it is determined that the boost side limit tap detection signal S5 has been generated, the process proceeds to step S11, and whether or not the secondary side voltage of the tapped transformer 13 is below the lower limit value V1 of the adjustment range. Determine whether. As a result, when it is determined that the secondary side voltage is not lower than the lower limit value V1 of the adjustment range, the process is terminated without doing anything thereafter. When it is determined in step S11 that the secondary voltage of the tapped transformer is below the lower limit value V1 of the adjustment range, the process proceeds to step S12 to determine whether or not the second flag is set to 1. As a result, if it is determined that the second flag is not set to 1, the measured value of the free-run timer is read in step S13, and the process proceeds to step S14, where the second flag is not set first. It is determined whether or not a set time has elapsed since the time determined in (1). As a result, when it is determined that the set time has not elapsed, the process is terminated without doing anything thereafter. When it is determined in step S14 that the set time has elapsed, the process proceeds to step S15 and the second flag is set to 1. Next, after the measured value of the elapsed time is reset to 0 in step S16, the second alarm display unit 32 is driven to perform a display operation in step S17. Thereby, the voltage adjustment to the step-up side by the pole transformer with the automatic tap switching function reaches the limit, and the state where the secondary side voltage of the transformer 13 with the tap is below the lower limit value of the adjustment range continues. An alarm indicating that In step S17, the second alarm display unit 32 performs a display operation, and then the process ends.

  When it is determined in step S01 that the step-down limit tap detection signal S1 has not been generated and in step S10 it is determined that the step-up limit tap detection signal S5 has not occurred (the step-down limit tap detection signal S1 is also boosted) If the limit tap detection signal S5 has not been generated), the process proceeds to step S18 to reset the second flag, and then the process ends. Therefore, when neither the step-down limit tap detection signal S1 nor the step-up limit tap detection signal S5 is generated, the display operation of the first alarm display unit 31 and the second alarm display unit 32 is not performed.

  If it is determined in step S01 that the step-down limit tap detection signal S1 has been generated and then it is determined in step S02 that the secondary voltage is equal to or lower than the upper limit value V2 of the adjustment range, step S08 is performed. Since it is not executed and the first alarm display unit 31 is not driven, the first alarm display unit 31 stops the alarm display operation. Similarly, if it is determined in step S10 that the boost side limit tap detection signal S5 has been generated, and if it is determined in step S11 that the secondary side voltage is equal to or greater than the lower limit value V1 of the adjustment range, Since S17 is not executed, the second alarm display unit 32 stops the alarm display operation.

  According to the present embodiment, the voltage adjustment to the step-down side by the pole transformer with an automatic tap switching function has reached the limit, and the secondary voltage of the tap transformer exceeds the upper limit of the adjustment range. The voltage adjustment to the boost side by the pole transformer with the automatic tap switching function has reached the limit, and the secondary voltage of the tapped transformer is below the lower limit of the adjustment range. Since the alarm display unit can be driven and the alarm display operation can be performed during maintenance, maintenance management for keeping the distribution line voltage in an appropriate range can be performed appropriately. For example, when the first alarm display unit 31 performs a display operation, it is possible to take measures such as adding a pole transformer with an automatic tap switching function.

  In the example shown in FIG. 5, it is first determined whether or not the step-down limit tap detection signal S1 is generated, and then it is determined whether or not the secondary voltage of the transformer exceeds the adjustment range. When the limit tap detection signal S1 is generated and the state where the secondary voltage of the transformer exceeds the adjustment range continues for the set time, the first alarm display unit 31 performs a display operation. However, it is determined whether the step-down limit tap detection signal S1 is generated after the determination whether the secondary voltage of the transformer exceeds the adjustment range first, An algorithm that causes the first alarm display unit to perform a display operation when the secondary voltage exceeds the adjustment range and the state where the step-down limit tap detection signal S1 is generated continues for a set time may be used.

  Similarly, after determining whether or not the secondary voltage of the transformer is below the adjustment range, it is determined whether or not the boost side limit tap detection signal S5 is generated. When the voltage is below the adjustment range and the state where the boost side limit tap detection signal S5 is generated continues for the set time, the second alarm display unit may perform the display operation.

  Moreover, in said embodiment, the 1st alarm display part 31 which performs an alarm display when the secondary side voltage (distribution line voltage) of a transformer exceeds an adjustment range and the pressure | voltage fall side limit tap detection signal has generate | occur | produced. And a second alarm display unit 32 that performs an alarm operation when the secondary voltage of the transformer is below the adjustment range and the boost side limit tap detection signal is generated. When an abnormality occurs in the device, it is conceivable that the step-down limit tap detection signal is not generated even though the distribution line voltage exceeds the adjustment range. Such an abnormal state cannot be displayed on the first alarm display unit and the second alarm display unit. In order to solve such a problem, in addition to the first alarm display unit and the second alarm display unit, a step-down limit tap detection signal is not generated even though the distribution line voltage exceeds the adjustment range. In such a case, an abnormality display unit for displaying an abnormality can be further provided. In this case, while providing the 1st and 2nd alarm display parts 31 and 32 in the bottom part of the control box 20, in the state which can confirm the abnormality display part comprised similarly to both alarm display parts from the ground. Install it. In this case, the display control unit disposed in the control box does not generate the step-down-side limit tap detection signal S1 even though the secondary voltage (distribution line voltage) of the transformer exceeds the adjustment range. Sometimes configured to drive the anomaly display.

  FIG. 6 is a flowchart showing another algorithm of a program to be executed by the microprocessor to configure the display control unit. In the present embodiment, it is determined whether or not the step-down limit tap detection signal S1 is generated after the determination as to whether or not the secondary side voltage of the transformer exceeds the adjustment range. When the state in which the secondary voltage exceeds the adjustment range and the step-down limit tap detection signal S1 is generated continues for a set time, the first alarm display unit performs a display operation. In the present embodiment, it is also determined whether or not the boost side limit tap detection signal S5 is generated after determining whether or not the secondary voltage of the transformer is below the adjustment range. When the state where the side voltage falls below the adjustment range and the boost side limit tap detection signal S5 is generated continues for the set time, the second alarm display unit is caused to perform a display operation. Further, in the present embodiment, when the step-down limit tap detection signal S1 is not generated despite the fact that the secondary voltage of the transformer exceeds the adjustment range, the first and second voltages are applied to the bottom of the control box. The abnormality display unit attached together with the alarm display unit is driven.

  In the case of the algorithm shown in FIG. 6, first, in step S01 ′, it is determined whether or not the secondary side voltage of the transformer 13 exceeds the upper limit value V2 of the adjustment range. As a result, if it is determined that the secondary side voltage exceeds the upper limit value V2, it is determined in step S02 ′ whether or not the step-down side limit tap detection signal S1 is generated. If it is determined in step S02 ′ that the step-down limit tap detection signal S1 has not been generated, the process proceeds to step S19 to drive the abnormality display unit, and the distribution line voltage exceeds the upper limit value of the adjustment range. Nevertheless, an abnormality display indicating that an abnormality in which the step-down-side limit tap detection signal S1 is not occurring has occurred (the transformer with the automatic tap switching function has some abnormality) is performed.

  When it is determined in step S02 ′ that the step-down limit tap detection signal S1 has been generated, the process proceeds to step S03, and it is determined whether or not the first flag is set to 1. Thereafter, the processing up to step S08 is the same as in the embodiment shown in FIG. 5, and the state where the secondary side voltage exceeds the upper limit value and the step-down side limit tap detection signal S1 is generated has passed for the set time. When it is detected, step S08 is executed to cause the first alarm display unit 31 to perform a display operation. Further, when this state continues (when the first flag is set), step S08 is repeatedly executed to cause the first alarm display unit 31 to continue the display operation.

  If it is determined in step S01 'that the secondary voltage exceeds the upper limit value V2, the first flag is reset in step S09', and the secondary voltage falls below the lower limit value V1 of the adjustment range in step S10 '. It is determined whether or not. As a result, when it is determined that the secondary voltage is lower than the lower limit value V1 of the adjustment range, the process proceeds to step S11 ′ to determine whether or not the boost side limit tap detection signal S5 is generated. If it is determined in step S11 ′ that the boost side limit tap detection signal S5 has not been generated, the process is terminated without doing anything thereafter. When it is determined in step S11 ′ that the boost side limit tap detection signal S5 has been generated, the process proceeds to step S12 to determine whether or not the second flag is set. Thereafter, the processing up to step S17 is the same as the example shown in FIG. 5, and the state where the secondary side voltage is lower than the lower limit value V2 and the boosting side limit tap detection signal S5 is generated has passed the set time. When it is detected, step S17 is executed to cause the second alarm display unit 32 to perform a display operation. When this state continues, the second alarm display unit 32 is repeatedly executed to continue the display operation. When it is determined in step S10 'that the secondary side voltage is not lower than the lower limit value V1, the process proceeds to step S18 and the second flag is reset.

  According to the present embodiment, it is possible to cause the abnormality display unit to perform a display operation when the voltage distribution line voltage exceeds the upper limit value of the adjustment range and the step-down limit tap detection signal S1 is not generated. Therefore, when any abnormality that cannot cope with the increase of the distribution line voltage occurs in the transformer with an automatic tap switching function, the abnormality can be displayed and the maintenance management of the transformer can be performed appropriately.

  In the example shown in FIG. 6, when it is determined in step S11 ′ that the boost side limit tap detection signal S5 has not been generated, the process is terminated without doing anything thereafter. However, in step S11 ′, the boost side When it is determined that the limit tap detection signal S5 is not generated, a step of driving an abnormality display unit different from the abnormality display unit driven at step S19 is added, and the distribution line is connected to the transformer with the automatic tap switching function. When an abnormality that cannot cope with the voltage drop occurs, the display operation can be performed on the other abnormality display unit.

  In each of the above embodiments, the secondary voltage of the transformer does not have a function to display itself indicating that it exceeds the upper limit of the adjustment range, but the control box or tank can be confirmed from the ground. Attach the distribution line voltage rise display unit and configure the display control unit to make the distribution line voltage rise display unit display when the secondary voltage of the tapped transformer exceeds the upper limit of the adjustment range By doing so, it is possible to display that the secondary voltage of the transformer exceeds the upper limit value of the adjustment range. In such a configuration, when the distribution line voltage exceeds the upper limit value, it can be notified immediately, the distribution line voltage increase display unit performs the display operation, and the first alarm display When the unit 31 is not performing the display operation, it can be notified that an abnormality has occurred in the transformer with an automatic tap switching function. In the case of such a configuration, the abnormality display unit driven in step S19 can be omitted in the process shown in FIG.

  In each of the above-described embodiments, when the display units such as the first alarm display unit 31 and the second alarm display unit 32 are configured by light emitters, the display operation of each alarm display unit is performed from the light emitting state. You may make it carry out by making it into a light extinction state, and you may make it carry out by making a light-emitting body into a light emission state from a light extinction state.

  In the above embodiment, the tap position detector 15 for detecting the position of the tap selected by the tap changer 14 is provided, the tap position detector detects the limit tap on the step-down side, and the tap transformer When the secondary voltage exceeds the upper limit of the adjustment range for a set time, and the tap position detector detects the limit tap on the boost side, and the secondary voltage of the tapped transformer is within the adjustment range. Although the warning display is performed when the state below the lower limit is continued for the set time, the present invention is not limited to such a configuration.

  For example, the tap selected by the tap changer is a limit tap on the side that steps down the secondary voltage of the tapped transformer, and a limit tap on the side that boosts the secondary voltage of the tapped transformer. In a state where the limit tap detector detects that the selected tap is the limit tap on the side that steps down the secondary voltage of the tapped transformer, When the state where the secondary side voltage of the transformer 13 with the tap exceeds the upper limit of the adjustment range continues for the set time, the first alarm display unit 31 performs the display operation, and the selected tap is selected. Is the limit tap on the side that boosts the secondary voltage of the tapped transformer, and the secondary voltage of the tapped transformer falls below the lower limit of the adjustment range while the limit tap detector detects that And has state may constitute the display control unit 33 so as to perform a display operation on the second warning display when lasts for the time set.

  FIG. 4 shows a configuration example of the limit tap detector 15 '. In this example, a limit switch T1 ′ that is turned on when the tap selector TS reaches a position (a position indicated by a circled numeral 1 in FIG. 2) for switching the energizing tap to a limit tap on the step-down side, and the tap selector. A limit tap detector 15 'is constituted by a limit switch T5' which is turned on when TS reaches a position (a position indicated by a circled numeral 5 in FIG. 2) where the energizing tap is switched to a booster limit tap. Yes. The limit tap detector 15 'shown in FIG. 4 generates a step-down limit tap detection signal S1 by turning on the limit switch T1' when the tap switch 14 switches the energization tap to the step-down limit tap. When the tap changer 14 switches the energizing tap to the boosting limit tap, the limit switch T5 'is turned on to generate the boosting limit tap detection signal S5.

  In the above embodiment, when the step-down limit tap is detected to be selected and the state where the secondary voltage of the tapped transformer exceeds the upper limit of the adjustment range continues for the set time. The alarm is displayed in the alarm display, and it is detected that the boost side limit tap is selected, and the state where the secondary voltage of the tapped transformer is below the lower limit of the adjustment range is the set time. The second alarm display unit is made to perform a display operation when it continues for a period of time, but only the alarm display unit 31 is provided, and it is detected that the step-down tap has been selected and is tapped. Only when the state where the secondary voltage of the transformer exceeds the upper limit of the adjustment range continues for a set time, the alarm display unit may perform the display operation.

  In this case, the display control unit 33 detects that the tap selected by the tap switch 14 is a limit tap on the side where the secondary voltage of the transformer 13 with a tap is stepped down is detected by the tap position detector 15. Is configured to cause the alarm display unit 31 to perform a display operation when the secondary voltage of the tapped transformer exceeds the upper limit of the adjustment range for a set time in the Or, the tap selected by the tap changer 14 is the limit tap on the side for stepping down the secondary side voltage of the transformer 13 with a tap. When the state where the secondary voltage of the device exceeds the upper limit of the adjustment range continues for a set time, the alarm display unit is configured to perform a display operation. In this case, the limit tap detector only needs to detect that the tap selected by the tap changer is a limit tap on the side where the secondary voltage of the transformer with the tap is stepped down. It is not necessary to detect that is selected.

  In the above embodiment, the alarm display unit is attached to the bottom of the control box 12, but the alarm display unit may be attached to a position where it can be easily confirmed from the ground, and the attachment position is not limited to the bottom of the control box. For example, it may be attached to the side of the control box, or attached to the bottom or side of the tank 16.

  In the above embodiment, the tap selected by the tap changer is the limit tap on the side that steps down the secondary voltage of the tapped transformer, and the secondary of the tapped transformer is detected. When the state where the side voltage exceeds the upper limit of the adjustment range (appropriate range) continues for the set time, the alarm display section performs the display operation. In addition to such an alarm display function, The function to communicate the signal including the information about the tap selected by the tap changer and the information about the secondary side voltage of the transformer with the tap to the master station installed at the sales office of the distribution system, etc. A transformer can also be provided.

  In order to have the above function, for example, a slave station having a function of communicating with a master station installed in a distribution system, and a signal including information indicating that the alarm display unit is performing a display operation A communication control unit for controlling the slave station may be provided so that the slave station is transmitted from the slave station to the master station.

  FIG. 9 shows a configuration of an embodiment of the present invention having a function of transmitting a signal including information indicating that the alarm display unit is performing a display operation from the slave station to the master station. 11 is a pole transformer in which a transformer with a tap having a plurality of taps and a tap changer for switching a tap for energizing the transformer to a tap selected according to a tap change command are accommodated in a tank. The main body, 15 is a tap position detector that detects the tap selected by the tap changer, 21 is a voltage detection unit that detects the secondary side voltage of the transformer with the tap, and 33 is the tap selected by the tap changer. Is detected by the tap position detector 15 to be a limit tap on the side where the secondary voltage of the tapped transformer is stepped down, and the secondary voltage of the tapped transformer exceeds the upper limit of the adjustment range. State There is a display control unit to perform a display operation on the alarm display unit when continued for a set time. These are configured in the same manner as in the above-described embodiment, but in this embodiment, the slave station 41 having a function of performing communication with the master station 40 installed in the power distribution system, and the alarm display unit perform a display operation. And a communication control unit 42 for controlling the slave station 41 so that a signal including information indicating that the slave station 41 is being transmitted from the slave station 41 to the master station 40 is further provided.

  The “signal including information indicating that the alarm display unit is performing the display operation” may be a signal indicating that the display control unit 33 is causing the alarm display unit to perform the display operation, and is detected by the voltage detection unit 21. It may be a signal including information that the operating voltage exceeds the upper limit of the appropriate range of the distribution line voltage and information that the tap position detector 15 detects the limit tap on the step-down side. .

  When the “signal including information indicating that the alarm display unit is performing the display operation” is a signal indicating that the display control unit 33 is causing the alarm display unit to perform the display operation, the display control is performed. What is necessary is just to comprise so that a communication command may be given to the communication control part 42 from the display control part 33, when the part 33 performs a display operation to an alarm display part, the output of the voltage detection part 21, and the output of the tap position detector 15 Need not be given to the communication control unit 42.

  When configured as shown in FIG. 9, the distribution line voltage is within the adjustment range due to the voltage adjustment function of the transformer reaching the limit at the installation location of the pole transformer with the automatic tap switching function. It is possible to know at the distribution system sales office without going to the site where the transformer is installed, so that the capacity of the pole transformer with the automatic tap switching function is large. It is possible to promptly perform an instruction for replacement, an instruction to check the power conditioner of the distributed power supply, etc., so that the maintenance management of the distribution system can be performed appropriately.

  FIG. 10 shows a configuration of another embodiment of the present invention having a function of transmitting a signal including information indicating that the alarm display unit is performing a display operation from the slave station to the master station. In this embodiment, the limit tap detector 15 'detects that the tap selected by the tap changer is the limit tap on the side where the secondary voltage of the tapped transformer is stepped down. Other configurations are the same as those of the embodiment shown in FIG.

  When providing a slave station having a function of communicating with the master station, the alarm display unit and the display control unit that causes the alarm display unit to perform a display operation can be omitted. FIG. 11 shows a configuration of still another embodiment of the present invention in which an alarm display unit and a display control unit for causing the alarm display unit to perform a display operation are omitted. In FIG. The main body 15 is a tap position detector that detects the position of the tap selected by the tap changer provided in the pole transformer main body. Further, 21 is a voltage detection unit that detects the secondary side voltage (distribution line voltage) of the transformer with tap, and 42 is a side on which the tap selected by the tap switch reduces the secondary side voltage of the transformer with tap. Is detected by the tap position detector 15 and when the secondary voltage of the tapped transformer exceeds the upper limit of the adjustment range for a set time, the tapped The communication control unit controls the slave station 42 so that the slave station 41 transmits a signal including information indicating that the voltage adjustment function by the transformer has reached the limit on the step-down side.

  FIG. 12 shows a configuration of still another embodiment of the present invention in which an alarm display unit and a display control unit that causes the alarm display unit to perform a display operation are omitted. In this embodiment, the tap switcher A limit tap detector 15 'detects that the selected tap is a limit tap on the side where the secondary voltage of the tapped transformer is stepped down. Other configurations are the same as those of the embodiment shown in FIG.

  When configured as shown in FIG. 11 or FIG. 12, the communication control unit 42 outputs a signal including information on the tap selected by the tap changer and information on the secondary voltage of the tapped transformer. It can also be configured to transmit from the slave station 41 to the master station 40. Even in such a configuration, the tap selected by the tap changer is a limit tap on the side that steps down the secondary voltage of the tapped transformer, and the secondary voltage of the tapped transformer is within the adjustment range. It is possible to know at the location of the master station that the upper limit is exceeded, so that maintenance and management of the power distribution system can be performed accurately and quickly.

1 Substation 2 Distribution Line 3 Automatic Voltage Regulator (SVR)
4, 5 Load 7 Transformer with automatic tap switching function 11 Pillar transformer body 12 Controller 13 Tap transformer 14 Tap switch 15 Tap position detector 15 'Limit tap detector 16 Tank 20 Control box 21 Voltage detector 22 tap switching control unit 31 first alarm display unit 32 second alarm display unit 33 display control unit 40 master station 41 slave station 42 communication control unit

Claims (10)

Transformer with a pole having a plurality of taps, and a pole transformer main body that accommodates in a tank a tap changer that switches a tap for energizing the transformer to a tap selected according to a tap change command, and The components of the control unit that gives a tap switching command to the tap changer in order to keep the distribution line voltage on the secondary side of the transformer with a tap within a set adjustment range are accommodated in a control box attached to the outside of the tank. In a pole transformer with an automatic tap switching function provided with a control device,
An alarm indicator attached to the control box or tank in a state that can be confirmed from the ground; and
A tap position detector for detecting a tap selected by the tap changer;
When the tap position detector detects that the tap selected by the tap changer is a limit tap on the side that steps down the secondary voltage of the tapped transformer, A display control unit that causes the alarm display unit to perform a display operation when a state where the secondary side voltage exceeds the upper limit of the adjustment range continues for a set time; and
A pole transformer with an automatic tap switching function. Transformer with a pole having a plurality of taps, and a pole transformer main body that accommodates in a tank a tap changer that switches a tap for energizing the transformer to a tap selected according to a tap change command, and The components of the control unit that gives a tap switching command to the tap changer in order to keep the distribution line voltage on the secondary side of the transformer with a tap within a set adjustment range are accommodated in a control box attached to the outside of the tank. In a pole transformer with an automatic tap switching function provided with a control device,
An alarm indicator attached to the control box or tank in a state that can be confirmed from the ground; and
A limit tap detector that detects that the tap selected by the tap changer is a limit tap on the side that steps down the secondary voltage of the tapped transformer;
In the state where the tap selected by the tap changer is a limit tap on the side where the secondary voltage of the transformer with the tap is stepped down is detected by the limit tap detector. A display control unit that causes the alarm display unit to perform a display operation when a state where the secondary side voltage exceeds the upper limit of the adjustment range continues for a set time; and
A pole transformer with an automatic tap switching function. Transformer with a pole having a plurality of taps, and a pole transformer main body that accommodates in a tank a tap changer that switches a tap for energizing the transformer to a tap selected according to a tap change command, and The components of the control unit that gives a tap switching command to the tap changer in order to keep the distribution line voltage on the secondary side of the transformer with a tap within a set adjustment range are accommodated in a control box attached to the outside of the tank. In a pole transformer with an automatic tap switching function provided with a control device,
First and second alarm display units attached to the control box or tank in a state that can be confirmed from the ground; and
A tap position detector for detecting a tap selected by the tap changer;
When the tap position detector detects that the selected tap is a limit tap on the side where the secondary voltage of the tapped transformer is stepped down, the secondary voltage of the tapped transformer is When the state exceeding the upper limit of the adjustment range continues for a set time, the first alarm display unit performs a display operation, and the selected tap is the secondary voltage of the transformer with the tap. When the tap position detector detects that the tap is a limit tap on the boosting side, the state where the secondary side voltage of the transformer with the tap is below the lower limit of the adjustment range is set. A display control unit that causes the second alarm display unit to perform a display operation when it continues for a period of time,
A pole transformer with an automatic tap switching function. Transformer with a pole having a plurality of taps, and a pole transformer main body that accommodates in a tank a tap changer that switches a tap for energizing the transformer to a tap selected according to a tap change command, and The components of the control unit that gives a tap switching command to the tap changer in order to keep the distribution line voltage on the secondary side of the transformer with a tap within a set adjustment range are accommodated in a control box attached to the outside of the tank. In a pole transformer with an automatic tap switching function provided with a control device,
First and second alarm display units attached to the control box or tank in a state that can be confirmed from the ground; and
The tap selected by the tap changer is a limit tap on the side where the secondary voltage of the tapped transformer is stepped down, and a limit tap on the side where the secondary voltage of the tapped transformer is boosted A limit tap detector to detect that there is,
When the limit tap detector detects that the selected tap is a limit tap on the side where the secondary voltage of the tapped transformer is stepped down, the secondary voltage of the tapped transformer is When the state exceeding the upper limit of the adjustment range continues for a set time, the first alarm display unit performs a display operation, and the selected tap is the secondary voltage of the transformer with the tap. During the time when the state where the secondary side voltage of the transformer with the tap is below the lower limit of the adjustment range is set in a state where the limit tap detector detects that the limit tap is on the side to boost the voltage A display control unit for causing the second alarm display unit to perform a display operation when it is continued;
A pole transformer with an automatic tap switching function. The control box or tank further comprises an abnormality display unit attached in a state that can be confirmed from the ground,
In the state where the secondary voltage of the tapped transformer exceeds the upper limit value of the adjustment range, the tap selected by the tap switch is the secondary side of the tapped transformer. Being configured to cause the abnormality display unit to perform a display operation when the tap position detector does not detect that it is a limit tap on the voltage step-down side,
The pole transformer with an automatic tap switching function according to claim 1 or 3. The control box or tank further includes a distribution line voltage rise display unit attached in a state that can be confirmed from the ground,
The display control unit is configured to cause the distribution line voltage increase display unit to perform a display operation when the secondary voltage of the tapped transformer exceeds the upper limit of the adjustment range;
A pole transformer with an automatic tap switching function according to any one of claims 1 to 4. A slave station having a function of communicating with a master station installed in a power distribution system;
A communication control unit that controls the slave station so that a signal including information indicating that the alarm display unit is performing a display operation is transmitted from the slave station to the master station;
The pole transformer with an automatic tap switching function according to claim 1 or 2, further comprising: Transformer with a pole having a plurality of taps, and a pole transformer main body that accommodates in a tank a tap changer that switches a tap for energizing the transformer to a tap selected according to a tap change command, and A control device that houses in the control box component parts of a control unit that gives a tap switching command to the tap changer so that the secondary distribution line voltage of the transformer with tap is within a set adjustment range. In a pole transformer with automatic tap switching function,
A slave station having a function of communicating with a master station installed in a power distribution system;
A tap position detector for detecting a tap selected by the tap changer;
It is detected by the tap position detector that the tap selected by the tap changer is a limit tap on the side where the secondary voltage of the tapped transformer is stepped down, and the secondary of the tapped transformer When a state occurs in which the side voltage exceeds the upper limit of the adjustment range, a signal including information indicating that the voltage adjustment function by the tapped transformer has reached the limit on the step-down side is transmitted from the slave station to the parent station. A communication control unit for controlling the slave station to transmit to the station;
A pole transformer with an automatic tap switching function. Transformer with a pole having a plurality of taps, and a pole transformer main body that accommodates in a tank a tap changer that switches a tap for energizing the transformer to a tap selected according to a tap change command, and A control device that houses in the control box component parts of a control unit that gives a tap switching command to the tap changer so that the secondary distribution line voltage of the transformer with tap is within a set adjustment range. In a pole transformer with automatic tap switching function,
A slave station having a function of communicating with a master station installed in a power distribution system;
A limit tap detector that detects that the tap selected by the tap changer is a limit tap on the side that steps down the secondary voltage of the tapped transformer;
It is detected by the limit tap detector that the tap selected by the tap changer is a limit tap on the side that steps down the secondary side voltage of the tapped transformer, and the secondary of the tapped transformer When a state occurs where the side voltage exceeds the upper limit of the adjustment range, a signal including information indicating that the voltage adjustment function by the tapped transformer has reached the step-down limit is sent from the slave station to the master station. A communication control unit for controlling the slave station to transmit,
A pole transformer with an automatic tap switching function. Transformer with a pole having a plurality of taps, and a pole transformer main body that accommodates in a tank a tap changer that switches a tap for energizing the transformer to a tap selected according to a tap change command, and A control device that houses in the control box component parts of a control unit that gives a tap switching command to the tap changer so that the secondary distribution line voltage of the transformer with tap is within a set adjustment range. In a pole transformer with automatic tap switching function,
A slave station having a function of communicating with a master station installed in a power distribution system;
Communication for controlling the slave station so that a signal including information on the tap selected by the tap changer and information on the secondary voltage of the tapped transformer is transmitted from the slave station to the master station A control unit;
A pole transformer with an automatic tap switching function.

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