JP2015149811A - Transformation ratio controller and substation supervisory control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the burden on the operator by preventing malfunction when changing the operating state of a transformer to other mode, in an electric power station where a plurality of transformers exist.SOLUTION: In a substation supervisory control system having transformers 11a, 11b, 11c, a plurality of apparatus provided on the primary and secondary of the transformer, apparatus controllers 21c, 23c for acquiring the transformation ratio information of the transformers, and the transformation ratio controller 22c for controlling the transformation ratio based on the transformation ratio information acquired from an apparatus controller, when the transformer 11c is stopping and the transformers 11a, 11b are operating in parallel, the transformation ratio controller 22c performs transformation ratio matching until the transformation ratio of the transformer 11c matches the transformation ratio of the transformers 11a, 11b, based on the transformation ratio information.

Description

  An embodiment of the present invention relates to a transformer ratio control device capable of preventing malfunction and reducing the burden on an operator when changing the operation state of a transformer to another mode in an electric station where a plurality of transformers exist. The present invention relates to a substation monitoring and control system using the transformer ratio control device.

  In a conventional electric power station with multiple transformers, to change the operating state of the transformer from single mode to parallel mode, the human system (site operator) determines the master-slave relationship of each transformer and manually The mainstream method is to adjust the transformation ratio many times and finally adjust it to the desired value.

  In the above-mentioned master-slave determination and manual operation, it is necessary to grasp the electrical system status such as the system status, tidal current, and quantity of electricity at the power station, and it is inevitably dependent on an operator with a certain level of skill and experience. It has become.

JP2012-60837A

  As described above, in operations that depend on the operator, the operation is complicated, and the operation may be performed in a state where the transformation ratio is different due to an erroneous operation due to manual operation. Loss may occur.

  In addition, there is a difference in tidal flow between the transformers, and the frequency of use of the transformers becomes uneven, which may cause a difference in the life of each transformer.

  An embodiment of the present invention relates to a transformer ratio control device capable of preventing malfunction and reducing the burden on an operator when changing the operation state of a transformer to another mode in an electric station where a plurality of transformers exist. An object of the present invention is to provide a substation monitoring and control system using the transformer ratio control device.

  Another object of the present invention is to provide a transformer ratio control device that can make the frequency of use of the transformer more uniform.

  In order to achieve the above-mentioned object, a transformer ratio control device according to an embodiment of the present invention is a system having three or more transformers, and an arbitrary transformer is connected to a plurality of other transformer systems in parallel operation. When in an isolated state, when the arbitrary transformer is joined to a plurality of other transformers in parallel operation, based on the transformation ratio information obtained from the three or more transformers, the arbitrary The transformation ratio matching process is performed until the transformation ratio of the other transformer matches the transformation ratio of the other plurality of transformers.

  Moreover, the substation monitoring control system using the said transformation ratio control apparatus is also one Embodiment of this invention.

It is the schematic which shows the structure of the substation monitoring control system which concerns on each 1st-5th embodiment of this invention. It is the schematic which shows the state of the substation monitoring control system which concerns on 1st Embodiment. It is a flowchart which shows the transformation ratio matching process sequence of the substation monitoring control system which concerns on 1st Embodiment. It is the schematic which shows the state of the substation monitoring control system which concerns on 2nd Embodiment. It is a flowchart which shows the transformation ratio matching process procedure of the substation monitoring control system which concerns on 2nd Embodiment. It is the schematic which shows the state of the substation monitoring control system which concerns on 3rd Embodiment. It is a flowchart which shows the transformation ratio matching process procedure of the substation monitoring control system which concerns on 3rd Embodiment. It is the schematic which shows the state of the substation monitoring control system which concerns on 4th Embodiment. It is a flowchart which shows the transformation ratio matching process sequence of the substation monitoring control system which concerns on 4th Embodiment. It is the schematic which shows the state of the substation monitoring control system which concerns on 5th Embodiment. It is a flowchart which shows the transformation ratio matching process sequence of the substation monitoring control system which concerns on 5th Embodiment. It is the schematic which shows the state of the substation monitoring control system which concerns on 6th Embodiment. It is a flowchart which shows the lifetime judgment processing procedure of the substation monitoring control system which concerns on 6th Embodiment.

  Embodiments of the present invention will be specifically described below with reference to the drawings.

(overall structure)
FIG. 1 is a schematic diagram showing the configuration of a substation monitoring and control system according to first to fifth embodiments of the present invention. This substation monitoring and control system has three transformers 11a (No. 1), 11b (No. 2), and 11c (No. 3). The primary side of the transformer (No. 1) 11a is connected to the system via the disconnector 12a and the circuit breaker 13a, and the secondary side of the transformer (No. 1) 11a is connected to the circuit breaker 14a, the disconnector 15a and the disconnector 16a. Connected with the load through. Similarly to the transformer (No. 1) 11a, the transformer (No. 2) 11b is connected to the system on the primary side via the disconnector 12b and the circuit breaker 13b, and the secondary side is connected to the circuit breaker 14b, the disconnector 15b and the disconnection. It is connected to a load via a device 16b. Further, the transformer (No. 3) 11c is also connected to the system through the disconnector 12c and the circuit breaker 13c on the primary side, and the secondary side is the circuit breaker 14c, the disconnector 15c and the disconnection, similarly to the transformer (No. 1) 11a. It is connected to a load via a device 16c.

  In addition, a bus tie 17 is provided between the secondary side of the transformer (No. 1) 11a and the secondary side of the transformer (No. 2) 11b. And the transformer (No. 2) 11b can be operated in parallel. Similarly, a bus tie 18 is provided between the secondary side of the transformer (No. 2) 11b and the secondary side of the transformer (No. 3) 11c. 11b and the transformer (No. 3) 11c can be operated in parallel.

  Furthermore, a device control device 21a for measuring and grasping the state of the disconnecting switch 12a and the circuit breaker 13a is installed on the primary side of the transformer (No. 1) 11a, and on the secondary side of the transformer (No. 1) 11a. Is provided with a device control device 23a for measuring and grasping the state of the disconnecting switch 14a and the circuit breaker 15a. Furthermore, the transformer (No. 1) 11a is provided with a transformer control device 22a that is connected to the equipment control device 21a and the equipment control device 23a and controls the state of the transformer (No. 1) 11a. Similarly, the transformer (No. 2) 11b and the transformer (No. 3) 11c are respectively provided with the equipment control devices 21b and 21c on the primary side and the equipment control devices 23b and 23c on the secondary side, respectively. Installed. Further, the transformer (No. 2) 11b is provided with a transformer control device 22b that is connected to the equipment control device 21b and the equipment control device 23b and controls the state of the transformer (No. 2) 11b. No.) 11c is provided with a transformer control device 22c that is connected to the device control device 21c and the device control device 23c and controls the state of the transformer (No. 3) 11c.

[First Embodiment]
(When No. 1 and No. 2 transformers are operating in parallel and No. 3 transformer is stopped)
FIG. 2 is a schematic diagram illustrating a state of the substation monitoring and control system according to the first embodiment. In FIG. 2, the device control device and the transformation ratio control device are only the device control device 21c, the transformation ratio control device 22c, and the device control device 23c corresponding to the transformer (No. 3) 11c. Description is abbreviate | omitted about the apparatus control apparatuses 21a and 21b, the transformation ratio control apparatuses 22a and 22b, and the apparatus control apparatuses 23a and 23b corresponding to the transformer (No. 1) 11a and the transformer (No. 2) 11b.

  In the substation monitoring and control system of this embodiment, the disconnector 12a, the circuit breaker 13a on the primary side of the transformer (No. 1) 11a, and the breaker 14a on the secondary side of the transformer (No. 1) 11a, the disconnection All of the switch 15a and disconnector 16a are in the “on” state, and are on the secondary side of disconnector 12b, breaker 13b, and transformer (No. 2) 11b on the primary side of transformer (No. 2) 11b. The circuit breaker 14b, the disconnecting switch 15b, and the disconnecting switch 16b are all in the “ON” state. Further, since the bus tie 17 is also in the “ON” state, the transformer (No. 1) 11a and the transformer (No. 2) 11b are connected as a system, and both are in a parallel operation state with a transformation ratio of 8. . In contrast, the disconnector 12c and the circuit breaker 13c on the primary side of the transformer (No. 3) 11c, and the circuit breaker 14c, the disconnector 15c, and the disconnector 16c on the secondary side of the transformer (No. 3) 11c. Are in the “OFF” state and the bus tie 18 is also in the “OFF” state, the transformer (No. 3) 11c is in a stopped state.

  In the substation monitoring and control system of this embodiment, in order to shift the stopped transformer (No. 3) 11c to the parallel operation together with the transformer (No. 1) 11a and the transformer (No. 2) 11b in parallel operation, It is necessary to boost the transformation ratio 6 of the transformer (No. 3) 11c to the same transformation ratio 8 as the transformer (No. 1) 11a and the transformer (No. 2) 11b. Hereinafter, a processing procedure for adjusting the transformation ratio of the transformer (No. 3) 11c to the transformation ratio of the transformer (No. 1) 11a and the transformer (No. 2) 11b will be described.

(Function)
FIG. 3 is a flowchart showing a transformation ratio matching process procedure of the substation monitoring and control system according to the first embodiment.

  First, the device control device 21c and the device control device 23c acquire the transformation ratio information of the transformer (No. 3) 11c that is stopped (step S11), and the transformation ratio control device 22c obtains the transformer (1 No.) 11a and transformer (No. 2) 11b transformation ratio information is acquired from the device control devices 21a, 21b (see FIG. 1) and the device control devices 23a, 23b (see FIG. 1) (step S12).

  Next, when the automatic transformation ratio matching signal of the stopped transformer (No. 3) 11c is input (step S13), the transformation ratio control device 22c performs the following automatic transformation ratio matching processing (steps S14 to 19). Run. That is, it is determined whether or not the transformation ratio of the transformer (No. 3) 11c is different from that of the parallel transformer (transformer (No. 1) 11a and transformer (No. 2) 11b) (Step S14). If the transformation ratio needs to be matched (YES in step S14), the processing flow (step S15 and subsequent steps) is executed. On the other hand, if the transformation ratio is already the same (NO in step S14), the process is terminated.

  In step S15, the transformation ratio control device 22c determines the transformation ratio of the transformer (No. 3) 11c that is the target transformer from the transformation ratio of the transformer (No. 1) 11a and the transformer (No. 2) that are operating in parallel. It is determined whether it is small (step S15). If it is small (YES in step S15), a command to increase the transformation ratio is output (step S16). If it is large (NO in step S15), a command to decrease the transformation ratio is output (step S17).

  After a lapse of a certain time required for switching the transformation ratio (step S18), the transformation ratio of the transformer (No. 1) 11a and the transformer (No. 2) 11b in parallel operation and the transformer (No. 3) as the target transformer It is determined whether or not the transformation ratio of 11c has the same value (step S19). If the values are the same (YES in step S19), the process ends. On the other hand, if they are different (NO in step S19), the process returns to step S15, and the automatic transformation ratio matching process is repeatedly executed.

(effect)
Usually, the transformation ratio matching is performed manually by a human system. However, according to the present embodiment, the transformation ratio matching process is performed by the transformation ratio control device 22c to obtain the transformation ratio 6 of the transformer (No. 3) 11c. It can be automatically adjusted to the same transformation ratio 8 as the transformer (No. 1) 11a and the transformer (No. 2) 11b. For this reason, when the operation state of the transformer is shifted from the single mode to the parallel mode, it is possible to prevent a malfunction by the operator and reduce the burden on the operator.

  Further, according to the present embodiment, the control is repeated until the transformation ratio is matched by the input operation of the automatic transformation ratio matching signal once in step S13, so that the operability is improved and the erroneous operation can be prevented. It is possible to prevent the operation in the situation where the occurrence of

  Furthermore, in the past, control was performed so that the voltage was not changed by measuring the “voltage”. However, according to this embodiment, the “transformation ratio” is used regardless of the voltage, and only the transformation ratio is determined. Switch from single to parallel. Since this transformation ratio can be known from the equipment itself, it is possible to contribute to cost reduction and failure rate reduction without using expensive digital devices.

[Second Embodiment]
(When two transformers are operating in parallel and the other transformer is operating independently)
FIG. 4 is a schematic diagram showing a state of a substation monitoring and control system according to the second embodiment of the present invention. Note that the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the substation monitoring and control system of the present embodiment, the transformer (No. 1) 11a and the transformer (No. 2) 11b are in the same parallel operation state as the first embodiment, but the transformer (No. 3). The state of 11c is different.

  That is, the disconnector 12c and the circuit breaker 13c on the primary side of the transformer (No. 3) 11c, and the circuit breaker 14c and the disconnector 16c on the secondary side of the transformer (No. 3) 11c are set to the “ON” state. ing. Further, the disconnector 15c and the bus tie 18 are in a “cut” state, and the transformer (No. 3) 11c is in a state of being independently operated at a transformation ratio of 6.

  In the substation monitoring and control system of the present embodiment, the transformer (No. 3) 11c that is operating alone is shifted to the parallel operation together with the transformer (No. 1) 11a and the transformer (No. 2) 11b that are operating in parallel. It is necessary to step up the transformation ratio 6 of the transformer (No. 3) 11c to the same transformation ratio 8 as the transformer (No. 1) 11a and the transformer (No. 2) 11b. Hereinafter, a processing procedure for adjusting the transformation ratio of the transformer (No. 3) 11c to the transformation ratio of the transformer (No. 1) 11a and the transformer (No. 2) 11b will be described.

(Action)
FIG. 5 is a flowchart showing a transformation ratio matching process procedure of the substation monitoring and control system according to the second embodiment.

  First, when the automatic transformation ratio matching signal of the stopped transformer (No. 3) 11c is input (step S21), the transformation ratio control device 22c starts the automatic transformation ratio matching process. Next, the device control device 21c and the device control device 23c of the transformer (No. 3) 11c acquire the system information of the transformer (No. 3) 11c, and the transformation ratio control device 22c receives the transformer ( The system information of No. 1) 11a and transformer (No. 2) 11b is acquired from the device control devices 21a, 21b (see FIG. 1) and the device control devices 23a, 23b (see FIG. 1) (step S22).

  Next, the transformation ratio control device 22c determines whether or not the target transformer (No. 3) 11c is in a single operation state (step S23). If it is in an isolated operation state (YES in step S23), it is determined whether or not there is a tidal current based on the acquired data (step S24). If there is a tidal current (NO in step S24), there is a working load. Therefore, the process is terminated so that the automatic adjustment process of the transformation ratio is not executed.

  On the other hand, if there is no power flow (YES in step S24), in order to disconnect the target transformer from the system, a “OFF” control command is output to the corresponding circuit breaker (step S25). Next, after a system state in which the transformation ratio can be switched by the circuit breaker “off” command signal, automatic transformation ratio matching processing is executed (step S26). This automatic transformation ratio matching process is the same as steps S14 to S19 in the first embodiment. After the automatic transformation ratio matching process in step S26 is completed, an “ON” command is output to the secondary side disconnector 15c and the bus tie 18 of the transformer that is the target of the automatic transformation ratio matching (step S27). (3) 11c is added to the parallel operation.

(effect)
According to the present embodiment, similarly to the first embodiment, when the operation state of the transformer is shifted from the single mode to the parallel mode, it is possible to prevent malfunction by the operator and reduce the burden on the operator. .

  In addition, according to the present embodiment, when there is a power flow in step S24, the circuit breaker control process and the automatic transformation ratio matching process are skipped and the process is terminated. In addition, unnecessary control processing can be prevented.

[Third Embodiment]
(When two transformers are operating in parallel and the other transformer is stopped)
FIG. 6 is a schematic diagram showing a state of a substation monitoring and control system according to the third embodiment of the present invention. Note that the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the substation monitoring and control system of the present embodiment, the transformer (No. 1) 11a and the transformer (No. 2) 11b are in a parallel operation state, and the transformer (No. 3) 11c is in a stopped state. Is the same as in the first embodiment, but the state of the equipment around the transformer (No. 3) 11c is different.

  That is, the disconnector 12c and the circuit breaker 13c on the primary side of the transformer (No. 3) 11c, and the disconnector 15c and the disconnector 16c on the secondary side of the transformer (No. 3) 11c are set to the “ON” state. ing. The circuit breaker 14c is in the “OFF” state, but the bus tie 18 is in the “ON” state. For this reason, the transformer (No. 3) 11c is in a stopped state. As described above, the state shown in the third embodiment is that the secondary circuit breaker 14c of the transformer (No. 3) 11c is set to “On” and at the same time the transformer (No. 3) 11c is connected to the system, and the transformer ( No. 1) 11a and the transformer (No. 2) 11b are in a general state that shifts to parallel operation.

(Function)
FIG. 7 is a flowchart showing a transformation ratio matching process procedure of the substation monitoring and control system according to the third embodiment.

The processing procedure of this embodiment is different from the processing procedure of the first embodiment shown in FIG. 3 only in that step S31 is used instead of step S13.
In step S31, the "ON" command output of the secondary circuit breaker 14c of the transformer (No. 3) 11c activates the automatic transformation ratio matching signal in step S13 of FIG. The ratio matching process is performed.

(effect)
In the first embodiment, a dedicated signal input is necessary as an activation signal for performing automatic transformation ratio matching. However, according to the present embodiment, the input of this automatic transformation ratio matching signal is not required, and further automation is achieved. Can be promoted. For this reason, it is possible to simplify the transition operation to parallel operation, improve operability, and prevent erroneous operations.

[Fourth Embodiment]
(When two transformers are operating in parallel and the other transformer is operating independently)
FIG. 8 is a schematic diagram showing a state of a substation monitoring and control system according to the fourth embodiment of the present invention. Note that the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the substation monitoring and control system of the present embodiment, the transformer (No. 1) 11a and the transformer (No. 2) 11b are in the same parallel operation state as in the first embodiment, but the transformer (No. 3) 11c. The condition of the surrounding equipment is different.

  That is, the disconnector 12c and the circuit breaker 13c on the primary side of the transformer (No. 3) 11c and the circuit breaker 14c, the disconnector 15c, and the disconnector 16c on the secondary side of the transformer (No. 3) 11c ”State. Further, the bus tie 18 is in the “off” state, and the transformer (No. 3) 11c is in a state of being operated independently at a transformation ratio of 6. As described above, in the state shown in the fourth embodiment, the bus tie 18 is set to “ON” and at the same time the transformer (No. 3) 11c is connected to the system, and the transformer (No. 1) 11a and the transformer (No. 2) 11b are connected. It is a state where it shifts to parallel operation.

(Function)
FIG. 9 is a flowchart showing a transformation ratio matching process procedure of the substation monitoring and control system according to the fourth embodiment.

The processing procedure of this embodiment differs from the processing procedure of the first embodiment shown in FIG. 3 only in that step S41 is used instead of step S13.
In step S41, the “input” command output of the bus tie 18 that connects the transformer (No. 3) 11c that is operating in isolation and the transformer (No. 1) 11a and the transformer (No. 2) 11b that are operating in parallel, 3, the automatic transformation ratio matching signal in step S13 is activated to perform the automatic transformation ratio matching process of the transformation ratio control device 22c.

(effect)
In the first embodiment, a dedicated signal input is necessary as an activation signal for performing automatic transformation ratio matching. However, according to the present embodiment, the input of this automatic transformation ratio matching signal is not required, and further automation is achieved. Can be promoted. For this reason, it is possible to simplify the transition operation to parallel operation, improve operability, and prevent erroneous operations.

[Fifth Embodiment]
(When two transformers are operating in parallel and the other transformer is stopped)
FIG. 10 is a schematic diagram showing a state of a substation monitoring and control system according to the fifth embodiment of the present invention. Note that the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the substation monitoring and control system of the present embodiment, all of the transformer (No. 1) 11a, the transformer (No. 2) 11b, and the transformer (No. 3) 11c are in the same state as in the first embodiment. That is, the transformer (No. 1) 11a and the transformer (No. 2) 11b are in a parallel operation state, and the transformer (No. 3) 11c is in a stopped state.

(Function)
FIG. 11 is a flowchart showing a transformation ratio matching process procedure of the substation monitoring and control system according to the fifth embodiment.

The processing procedure of this embodiment is different from the processing procedure of the first embodiment shown in FIG. 3 in that step S51 is added between step S13 and step S14, and step S52 is added after step S19. Is different.
In step S51, the indication “transforming ratio is being adjusted” is turned on, and in step S52, the indication “transforming ratio is being adjusted” is turned off.

(effect)
In the first to fourth embodiments, it is not possible to determine that the control output and the transformation ratio are being switched during the automatic transformation ratio matching process, but in this embodiment, the automatic transformation ratio matching process is in progress. Can be visually determined, and it can be determined that the automatic transformation ratio matching process is in progress.

  Therefore, according to the present embodiment, it is possible to easily determine whether or not there is a functional operation, and it is possible to prevent erroneous operations such as operating other transformer ratios during parallel operation during the transformer ratio matching control.

[Sixth Embodiment]
(When performing life diagnosis)
A sixth embodiment of the present invention will be described with reference to FIGS.
FIG. 12 is a schematic diagram illustrating a state of a substation monitoring and control system according to the sixth embodiment.
In the present embodiment, a measuring device 25 is provided instead of the device control device 21c and the device control device 23c, as compared with the configuration of the substation monitoring and control system according to the first embodiment shown in FIG. The measuring device 25 is a means for measuring the power flow value and voltage value of each transformer. Further, the devices around the transformer (No. 1) 11a, the transformer (No. 2) 11b, and the transformer (No. 3) 11c are all in the “off” state.

(Function)
FIG. 13: is a flowchart which shows the lifetime judgment processing procedure of the substation monitoring control system which concerns on 6th Embodiment.

  First, the measuring device 25 measures the power flow value and voltage value of each transformer (step S61), and integrates the electric energy (step S62). Next, the transformation ratio control device 22c acquires No. 1 electric energy, No. 2 electric energy, No. 3 electric energy operated in each transformer (steps S63a, S63b, S63c), and the electric energy operated in each transformer. Are compared (step S64). The greater the amount of power, the longer the transformer is used, and the shorter the lifetime. For this reason, if it operates in an order from a transformer with little electric energy, it will promote the equalization of the lifetime of the whole transformer.

  Next, the transformation ratio control device 22c creates a list in the order of decreasing operation of each transformer (step S65), calculates the necessary number of units to be operated in parallel from the total current flowing through the transformer, A device is preferentially selected (step S66). Furthermore, the transformation ratio control device 22c displays on the monitor a recommended transformer of the applicable transformer that promotes uniform life (step S67).

(effect)
According to the present embodiment, the frequency of use of the transformer can be made more uniform by switching the operation to a transformer with less electric power, and the life of each transformer can be made uniform.

[Other embodiments]
(1) In each of the above embodiments, three transformer ratio control devices 22a, 22b, and 22c are used (see FIG. 1), but a transformer ratio control device that is integrated into one machine can also be used.

(2) In each of the above embodiments, the transformer (No. 3) 11c is targeted, and the operation state of the transformer is shifted to parallel operation in another mode. However, the transformer (No. 1) 11a or The transformer (No. 2) may be targeted. That is, when either the transformer (No. 1) 11a or the transformer (No. 2) is stopped or operating independently, it may be shifted to the parallel operation of another mode.

(3) In each of the above embodiments, an example of three transformers has been shown. However, any number of transformers can be used as long as the number of transformers is three or more.

(4) The data of the transformation ratio control device 22c in each of the above embodiments can be taken into a personal computer or the like in the upper control room and displayed on a monitor for monitoring.

(5) In each of the above-described embodiments, the example in which the transformer ratio of the transformer is matched has been shown, but this may be matched using a tap value.

(6) In the sixth embodiment, the measuring device 25 is used to measure the power flow value and the voltage value of each transformer. However, using the device control devices 21c and 23c in the first to fifth embodiments. Also good.

(7) Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

11a ... Transformer (No. 1)
11b ... Transformer (No. 2)
11c ... Transformer (No. 3)
12a, 12b, 12c ... disconnector (primary side)
13a, 13b, 13c ... circuit breaker (primary side)
14a, 14b, 14c ... circuit breaker (secondary side)
15a, 15b, 15c ... disconnector (secondary side)
16a, 16b, 16c ... disconnector (bustie)
17 ... Bus tie 18 ... Bus tie 21a, 21b, 21c ... Device control device 22a, 22b, 22c ... Transformer ratio control device 23a, 23b, 23c ... Device control device 25 ... Measuring device

Claims (7)

  In a system having three or more transformers, when any transformer is in isolation from other parallel operating transformer systems, the optional transformer is connected to other parallel operating systems. When joining a transformer system, based on the transformation ratio information acquired from the three or more transformers, until the transformation ratio of the arbitrary transformer matches the transformation ratio of the other transformers A transformer ratio control device that performs a transformer ratio matching process.   The arbitrary transformer is in a single operation state, and before performing the transformation ratio matching process, the arbitrary transformer is once disconnected from the system, and after performing the transformation ratio matching process, The transformer ratio control device according to claim 1, wherein a transformer is reconnected to the system.   When the arbitrary transformer is in a stopped state and only one of the peripheral devices on the secondary side of the arbitrary transformer is in the “OFF” state, the “OFF” state device The transformer ratio control apparatus according to claim 1, wherein the transformer ratio adjustment process is performed when the switch is in an “ON” state.   3. The transformer according to claim 2, wherein before the arbitrary transformer is disconnected from the system, it is checked whether or not there is a tidal current, and if there is a tidal current, the transformation ratio matching process is not performed. Ratio control device.   The transformer ratio control apparatus according to any one of claims 1 to 3, wherein a corresponding transformer can be discriminated while the transformation ratio matching process of the arbitrary transformer is performed.   In a system having three or more transformers, obtain integrated values of electric power from each transformer, compare these values, and issue a command to switch operations in order from the transformer with the smallest integrated value. A transformer ratio control device characterized by that. Obtained from three or more transformers, a plurality of devices respectively provided on the primary side and the secondary side of the transformer, a device control device that acquires transformation ratio information of the transformer, and the device control device In a substation monitoring and control system having a transformation ratio control device that controls a transformation ratio based on transformation ratio information,
Of the three or more transformers, when an arbitrary transformer is in an isolated state from a plurality of other parallel-operating transformer systems, the transformation ratio control device connects the arbitrary transformer to another When joining a plurality of transformers in parallel operation, based on the transformation ratio information acquired from the device control device, the transformation ratio of the arbitrary transformer and the transformation ratio of the other plurality of transformers A substation monitoring and control system that performs the transformation ratio matching process until they match.

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