JPH10336898A - Tap switching control device of transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize a range being affected when a tap switching control part is abnormal or on maintenance inspection, by providing a control command output circuit for controlling each transformer in parallel, that is being operated in parallel by a tap up/down control command being operated by a main control device. SOLUTION: System voltage information is taken from a voltage detector 3 for detecting the system voltage via an optical star coupler 7, and an integrated monitor control device 8 for outputting a tap up/down command when the system voltage deviates from a specific voltage is provided. Electric motors 4-1B-4-3B that are used as a dial switch for driving the tap switching of each of transformers 1B-3B are provided. Based on the tap up/down command of the integrated monitor control system 8, the tap switching of arbitrary number of transformers out of three transformers 1B, 2B, and 3B being connected to a bus via each of the electric motors 4-1B-4-3B is controlled. Furthermore, tap switching control parts 6-1B, 6-2B, and 6-3B for separately monitoring, for example, the tap switching state of the transformers 1B, 2B, and 3B are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer tap switching control device used in a distributed electric power plant monitoring and control system and the like, and in particular, various problems relating to each transformer tap switching during parallel operation of transformers. The present invention relates to a transformer tap switching control device which improves the above.

[0002]

2. Description of the Related Art Generally, when a system accident or a change in power supply and demand occurs, the system voltage also changes. If the system voltage deviates from the rated voltage and goes out of the allowable range, not only will the operation of the electric equipment be hindered, but also there will be a risk of damaging the customer. Therefore, when the system voltage fluctuates, the tap switching control of the transformer is performed to perform the system voltage raising / lowering control.

[0003] By the way, when raising and lowering the system voltage, 1
Although there is no problem in the case of single operation of the transformers, the following inconvenience occurs when a plurality of transformers are operated in parallel. That is, when the tap switching control of a plurality of transformers is to be performed, the procedure is such that after performing tap switching of one transformer, tap switching of the next transformer is performed after an appropriate time. Therefore, there is a problem that the system voltage does not reach the predetermined system voltage until tap switching of all transformers is completed. Therefore, it takes a long time to perform the tap switching time of all the transformers even if the lifting control by the tap switching of the transformer is performed, and as a result, it is determined that the system voltage does not reach the predetermined voltage, and the tap switching is performed. It may be determined that the control is abnormal.

Therefore, conventionally, a transformer tap switching control device for simultaneously switching the taps of a plurality of transformers during the parallel operation of the plurality of transformers has been used. Hereinafter, two specific examples of the related art will be described. (1) Conventional Example 1 FIG. 15 is a system configuration diagram for explaining a transformer parallel operation state. This system configuration includes a circuit breaker for busbar connection (hereinafter referred to as a motherboard CB) between the instep A bus and the inversion A bus, and a series circuit of an inversion line switch ALS and an inversion line switch OLS. Are connected in parallel, and transformers 1B and 2B are individually interposed between the common line of the switches A and LS of each group and the B bus. Further, there is provided a transformer tap switching control device 1 for controlling transformer tap switching during parallel operation of the plurality of transformers 1B and 2B.

[0005] When the transformers are operated in parallel in such a system configuration, for example, when two sets of instep line switches A and LS enter together, both transformers 1B and 2B are connected between the A and B buses. Since they are connected, they operate in parallel. Also,
The mother CB enters, and the 1B side line switch instep LS
When the 2B side line switch ZLS is turned on, the instep A bus and the ZA bus are electrically common, so that the transformers 1B and 2B operate in parallel.

FIG. 16 is a block diagram of a conventional monitoring and control system provided with a transformer tap switching control device 1 installed in a distributed electric substation. This system includes a voltage detector 3 which takes in the system voltage of a bus via a voltage transformer 2, and sets a parallel operation state manually, or switches a tap to each of the motors 4, 5 when a tap elevating command is received from the outside. A tap switching control unit 6 for simultaneously switching and controlling the taps of the transformers 1B and 2B connected to the bus by giving a control command, and a light having these voltage detectors 3, tap switching control unit 6, etc., and an optical star coupler 7. It comprises a centralized monitoring and control device 8 that exchanges information via a LAN (Local Area Network).

In the system having such a configuration, when the system voltage taken in by the centralized monitoring and control device 8 from the voltage detector 3 through the optical star coupler 7 exceeds a predetermined voltage, the tap is automatically or manually operated. It outputs a lift command and outputs a tap switching control unit 6 via an optical star coupler 7.
To send to. Here, the tap switching control unit 6 receives the tap elevating command during the parallel operation of the transformers.
To the transformers 1B and 2 at the same time.
B at the same time as switching both transformers 1B and 2B
It is configured to detect the presence or absence of mutual tap deviation.

FIG. 17 is a specific configuration diagram of the conventional tap switching control section 6. As shown in FIG. In the figure, 11 is a tap elevating / lowering command input from the centralized monitoring and control device 6, 12 is a 1B automatic selection command input from the centralized monitoring and controlling device 6, and 13 is a 1B manual input from the tap switching control unit itself. The selection commands 14 and 15 are 1B parallel operation commands and 1B independent operation commands also input manually from the tap switching control unit. These commands 12 to 15 are command output control systems of the transformer 1B. For example, during parallel operation, a 1B parallel operation command 14, a 1B automatic selection command 12 or a 1B manual selection command 13 is input, and a tap elevating command 11 Is input through the OR circuit 16 and the AND circuit 17,
D circuit 18 is established, and OR circuits 20, 30 and AND circuit
Tap elevating control commands 33 and 34 are simultaneously transmitted to the transformers 1B and 2B via the circuits 31 and 32.

On the other hand, when the transformer is operated alone, the 1B single operation command 15 is input, and the AND circuit 19, the OR circuit 20,
When the condition of the ND circuit 31 is satisfied, a 1B tap elevating control command 33 is output.

Further, each of the commands 22 to 25 is a command output control system of the transformer 2B, and outputs a tap elevating control command of each of the transformers 1B and 2B in parallel / single operation in the same manner as described above.

Reference numeral 36 denotes an abnormal output of the motor and the device such as the tap switching control unit 6 and the like.
The outputs of the taps 1 and 32 are set to “0”, and the tap elevating control commands 33 and 34 are locked. 38 is a dial switch 1B
-B, 2B-B (see FIG. 18), the two transformers 1B,
A tap shift detecting unit that detects a tap shift of 2B, and detects a tap shift of both transformers 1B and 2B;
The outputs of the AND circuits 31 and 32 are set to “0” via the NOT circuit 39, and the tap elevation control commands 33 and 34 are locked.

FIG. 18 is a specific configuration diagram of a conventional tap deviation detecting section. This tap deviation detecting unit is connected to each transformer 1
It is composed of dial switches 1B-B and 2B-B which are switched in accordance with the tap positions of B and 2B, and a tap shift detecting circuit 38 in the tap switching control unit 6. The dial switches 1B-B and 2B-B have a configuration in which the c tap is common and the taps "1" to "n" are sequentially switched according to the tap positions of the transformers 1B and 2B.

On the other hand, the tap deviation detecting circuit 38 detects a power supply when the contacts 41 and 42, which are manually closed during parallel operation, and the two dial switches 1BB and 2BB select the same number of taps. Auxiliary relay 43 that operates by determining that there is no tap displacement through contact 41 through the same number tap-contact 42 of dial switch 1B-B and 2B-B.
And a contact 43b that is opened when the auxiliary relay 43 operates.
A tap shift detection timer 44 that is set to a parallel operation state and that operates a predetermined time after closing the contact 43b when the auxiliary relay 43 is inoperative due to tap shift and outputs a tap shift detection signal from the contact 44a; It is composed of (2) Conventional example 2 Conventionally, when a transformer is installed for each bank, parallel operation may be performed using a transformer of the own bank and a transformer of another bank.

FIG. 19 is a system configuration diagram in the case where the transformers are operated in parallel between the banks. That is, this system includes a transformer 1B + a main transformer secondary CB (hereinafter referred to as a main transformer secondary CB) 51B in each bank bus.
2B + 52B, 3B + 53B series circuits are connected, and the bus connection CB is provided between the other ends of these series circuits.
(Hereinafter, referred to as mother CB) 54 is inserted.

In such a system, the local unit CB
Under the condition of entering and own bank main variable secondary CB, transformer parallel operation of the transformer of the own bank and the transformer of another bank becomes possible.

FIG. 20 is a diagram showing a conventional example of tap deviation detection when transformer parallel operation is performed using a transformer spanning a plurality of banks as described above. In FIG.
To A3 are the positive power supplies PU11, PU21, PU of each bank.
61, 7 which are connected to 31 and are closed according to the condition that each own bank main variable secondary CB is included + own unit mother CB is included
Reference numerals 1 and 81 denote transformers B1, B2 and B3 of the own bank (FIG. 19).
Dial switches 62, 72, and 82 corresponding to the tap positions of the transformers B1, B3, and B3 of other banks.
A dial switch that switches in accordance with the tap position of B2, B1 is a contact that closes under the condition that the NO2 bank main variable secondary CB is included + mother CB is included, and B2 is a NO3 bank main variable secondary CB is included + mother CB is included. B3 is a contact that closes under the condition that the NO1 bank main variable secondary CB enters and the mother CB enters. The dial switch 61-7
Taps of the same number 2, 71-82, 81-62 are connected by a multi-core cord that connects one-to-one. Reference numerals 63, 73, and 83 denote auxiliary lasers which perform an exciting operation when the transformer of the own bank and the transformer of the other bank are operating in parallel and the tap positions of both transformers are the same. Have.

FIG. 21 shows the transformer B1 and the NO in the NO1 bank.
It is a figure which shows the state of tap deviation detection at the time of parallel operation with the transformer B2 of 2 banks concretely. As is clear from this figure, when the transformers B1 and B2 are operated in parallel,
When the tap positions of B2 are equal, the dial switch 61
Since the tap with the same number of −72 is selected, an energizing circuit is formed, and the contact of the contact 63
x is open.

However, if the taps of the transformers B1 and B2 between the banks are shifted, the tap positions of the dial switches 61 and 72 indicating the tap positions are also shifted and the power is turned off, so that the auxiliary relay 63 is demagnetized. The contact 63x of the relay 63 is turned on, and the contact 65x is turned on after the auxiliary relay timer 65 elapses a predetermined time.
Operates to display the failure state and lock the tap switching control of the tap deviation bank at the same time.

[0019]

However, the following problems have been pointed out in the above-described conventional tap switching control apparatus for transformers. (1) Problems of Conventional Example 1 Since the tap switching control unit 6 shown in FIG. 17 switches the parallel operation by manual operation, there is a concern that an operation error by a human system may occur. After all, there is a problem that it is necessary to secure skilled operators.

Further, in the tap switching control device using a plurality of transformers as shown in FIG. 16, there is no need to exchange control condition information as compared with the case where individual transformers are provided.
It can be realized at low cost. However, at the time of abnormality or maintenance and inspection, all of the plurality of transformers must be made non-use, and there is a problem that the monitoring of the power system is hindered.

Further, in the tap shift detecting system shown in FIG. 18, although an error of the tap shift can be detected, it is difficult to detect an abnormal portion in a limited manner, and a long time is required for recovery.
In particular, in recent years, in an environmental situation in which the electric power situation is imminent, an operator's operation error is not allowed, and higher reliability is required. In addition, the operation of simultaneously stopping a plurality of transformers at the time of maintenance and inspection or at the time of a device abnormality is no longer permitted, and early improvement is desired. (2) Problems of Conventional Example 2 Next, in the configuration of Conventional Example 2, since two dial switches are installed for each bank, the mounting space becomes large, and the number of dial switch mounting steps is reduced. There is a problem that the cost is increased due to an increase in the number and an improvement in the accuracy of the switching mechanism of the dial switch.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a transformer tap switching control device for minimizing a range in which a tap switching control unit is affected when an abnormality or maintenance is performed. .

Another object of the present invention is to provide a method of switching taps of a transformer for specifying a target of abnormality when a master-slave switching of each tap switching control unit or a tap deviation of a transformer is abnormal, thereby realizing quick recovery. It is to provide a control device.

Still another object of the present invention is to provide a transformer tap switching control device for reducing the number of dial switches per bank and reliably detecting a tap shift between banks.

[0025]

According to a first aspect of the present invention, there is provided a transformer tap switching control which is provided in each of transformers distributed in an electric substation and which performs tap switching control for a corresponding transformer. In the device, a transformer parallel operation detection circuit for detecting the transformer parallel operation electrically connected to the same bus according to the connection state of the power system of the electric substation, and a transformer parallel connection to the tap switching control device of each transformer in advance. A main control device determining circuit that sets a control priority during operation and sets a tap switching control device having the highest priority in the transformer parallel operation detected by the transformer parallel operation detection circuit as a main control device. And a control command output circuit for controlling in parallel each of the transformers in the transformer parallel operation state in accordance with a tap elevating control command output by the main control device.

By taking such means, the control priority is set in advance for the tap switching control device of each transformer, and the transformer parallel operation detection circuit detects the parallel operation of the transformers connected to the same bus. When the main control device determination circuit receives the parallel operation detection from the transformer parallel operation detection circuit, determines the tap switching control device having the highest priority in the transformer parallel operation as the main control device, Since the transformers in parallel operation are controlled in parallel according to the tap elevating control command of the main controller, the parallel operation by the combination of various transformers can be detected automatically, and the main control is performed according to the control priority. Since the tap switching control device to be the device is determined and the parallel control of each transformer is performed under the tap elevating control command from the main control device, there is no operation error by the human system. Each transformer in the parallel operation state reliably, and it can be stably controlled.

According to a second aspect of the present invention, in the first aspect of the present invention, when an error occurs in the tap switching control device serving as the main control device, the tap switching control device in which the device abnormality has occurred is provided. Is excluded from the main controller,
A tap switching control device for a transformer provided with a switching circuit having a tap switching control device having the next highest priority as a main control device among the remaining tap switching control devices in the transformer parallel operation state.

By adopting such means, when an abnormality occurs in the tap switching control device serving as the main control device, the main control device is excluded and the tap switching control device having the next highest priority is set. Since the transformers are selected as the main control device and the transformers in the parallel operation state are controlled in parallel, the tap elevating control can be performed without using all the transformers, and the trouble can be minimized.

According to a third aspect of the present invention, in accordance with the first aspect of the present invention, the main control device determination information of each main control device determination circuit of the tap switching control device in the transformer parallel operation state is collected. A mismatch detection circuit for detecting a mismatch in the main control device determination information of the main control device determination circuit, and when each of the main control device determination circuits detects a mismatch in the main control device determination information, An abnormal device specifying circuit that specifies an abnormal tap switching control device based on majority decision of main control device determining information of a control device determining circuit.

By taking the above-described means, it is possible to specify whether the abnormality is in the own tap switching control unit or the abnormality in the other tap switching control unit, and the abnormality can be quickly recovered. In addition, a normal transformer can be continuously used without locking an unnecessary tap switching control unit.

According to a fourth aspect of the present invention, in accordance with the first aspect of the present invention, tap information of each transformer in the transformer parallel operation state is collected, and mismatch of detecting tap information of each transformer is detected. A detection circuit, and an abnormal device identification circuit that identifies an abnormal tap switching control device by a majority decision of the collected tap information of each transformer when the mismatch of the tap information of each transformer is detected by the mismatch detection circuit. Is a transformer tap switching control device provided with a transformer.

By adopting such means, it is possible to specify whether an abnormality has occurred in the own tap switching control unit or another tap switching control unit in the same manner as the invention according to claim 3, and when a tap deviation has occurred, It is possible to easily specify whether the tap is shifted on the self-transformer side or the tap shift on the other transformer side, and the abnormality can be quickly recovered.

According to a fifth aspect of the present invention, in the third or fourth aspect, when the abnormal device specifying circuit specifies an abnormal tap switching control device,
Excluded from the transformer parallel operation detection target of the transformer parallel operation detection circuit, the control priority target of the main controller determination circuit, the mismatch detection target of the main controller determination information of the mismatch detection circuit, or the tap detection mismatch detection target of the mismatch detection circuit The transformer tap switching control device further includes a blocking circuit that locks the tap elevating control of the transformer corresponding to the abnormal tap switching control device.

By adopting such means, in addition to having the same operation as the inventions corresponding to the third and fourth aspects, there is no inadvertent locking of the tap switching control section. An invention corresponding to claim 6 is a transformer tap switching control device which is provided in each of the transformers distributed in an electric substation and performs tap switching control on the corresponding transformer.
A circuit for connecting an auxiliary relay to each tap position of the transformer switched by the tap elevating control command or for a plurality of grouped tap positions in common, and collecting contact information of the auxiliary relay as tap information of the transformer; Collects the tap information of transformers that are electrically connected to the same bus according to the connection status of the power system at the substation, and that detects the tap information of the transformers that are in a parallel operation state, detects mismatch of tap information of each transformer, and detects tap deviation. And a tap shift control device for a transformer provided with a tap deviation detection circuit. By taking such a measure, it is possible to reliably detect a tap shift between banks from the operation of the auxiliary relay.

[0035]

FIG. 1 is a system configuration diagram of a transformer parallel operation state using a transformer tap switching control device according to the present invention. This system, as in FIG. 16, detects a system voltage of the bus via a voltage transformer 2 and fetches system voltage information from the voltage detector 3 via, for example, an optical star coupler 7. A centralized monitoring and control device 8 that outputs a tap elevating command automatically or by a human system when the system voltage exceeds a predetermined voltage, and each of the transformers 1B to 3
Motors 4-1B to 4-3B having a role of a dial switch for performing tap change driving of B, and motors 4-1B to 4-3B based on a tap elevating command of centralized monitoring and control device 8
For example, three transformers 1B, 2 connected to the bus via
Tap switching control units 6-1B and 6-2 for performing tap switching control of an arbitrary number of transformers among B and 3B and individually monitoring the tap switching state of each of transformers 1B, 2B and 3B.
B, 6-3B.

Therefore, the difference between the apparatus of the present invention and the apparatus of FIG. 16 is that the motor 4-1 performs tap switching of an arbitrary number of transformers among the transformers 1B, 2B and 3B.
B, 4-2B, 4-3B, and each of these motors 4-1B,
That is, tap switching controllers 6-1B, 6-2B, and 6-3B that individually perform switching control commands are provided for 4-2B and 4-3B.

The motors 4-1B, 4-2B,
4-3B and tap switching control units 6-1B, 6-2B,
6-3B has the same configuration among the transformers 1B, 2B, and 3B, and therefore, for convenience of explanation, the description will be focused on the portion related to the transformer 1B. Of course, it goes without saying that even when three or more transformers are installed, it can be realized based on the same idea.

The tap switching control section 6-1B outputs a tap elevation control command based on the tap elevation command of the centralized monitoring and control device 8, while an abnormal state of the tap switching control section and an output of each transformer are described later. It has a tap deviation detection, master-slave switching abnormality and other necessary functions.

On the other hand, the electric motor 4-1B receives the tap elevating control command from the centralized monitoring and control device 8, and eventually the tap switching control unit 6-1B, and performs the tap switching of the transformer 1B, as shown in FIG. It has a role of a dial switch for generating a condition signal for the tap position of the transformer 1B (2B, 3B).

FIG. 3 shows a transformer parallel operation state which is a part of the tap switching control unit 6-1B corresponding to the transformer 1B among the transformer tap switching control devices according to the first aspect. FIG. 2 is a configuration diagram of a transformer parallel operation detection circuit to be used.
The configuration of this circuit will be described by taking, as an example, a case where the circuit is applied to the system configuration shown in FIG.

In the figure, reference numerals 101, 102, and 103 denote line switch insteps L connected to instep A buses (first buses).
An auxiliary relay contact that opens and closes in conjunction with S.
A, 105, 10 auxiliary relay contacts that open and close in conjunction with B
6, 107 are auxiliary relay contacts that open and close in conjunction with an Otsu line switch Otsu LS connected to Otsu A bus (second bus);
108 and 109 are auxiliary relays.

Hereinafter, the detection operation of the transformer parallel operation state will be described with reference to the circuit configuration shown in FIG. Now, Mothers C
When B is open, contact 104 is open. In this state, when the contacts 101 and 102 are closed with the transformers 1B and 2B side line switch A LS both entering, or with the transformer 1B and 2B side second line switch B LS both entering. When 105 and 106 are closed,
The first auxiliary relay 108 operates to detect the parallel operation state of the transformers 1B and 2B.

When the mother CB is closed, the contact 104
Is closed. At this time, when the contacts 101 and 102 are closed with the transformers 1B and 2B side line switches A and LS both entering, or the contacts 105 and 106 are placed with the transformer 1B and 2B side second line switches B and LS together. When closed
Further, the contact 101 is closed when the transformer 1B side line switch B is turned on, the contact 106 is closed when the transformer 2B side line switch B is turned on, or the contact 105 is closed when the transformer 1B side line switch B is turned on. Transformer 2B side line switch Contact point 1 due to the instep LS
When the valve 02 is closed, the first auxiliary relay 108 operates, and similarly, the parallel operation state of the transformers 1B and 2B can be detected.

Further, in the same manner as described above, the contact 1
When the contacts 01 and 103 are closed or the contacts 105 and 107 are closed, and when the contacts 101 and 107 are closed or the contacts 105 and 103 are closed, the second auxiliary relay 109 is operated to detect the parallel operation state of the transformers 1B and 3B.

According to such a transformer parallel operation detection circuit, when the bus CB is opened and closed, the transformers 1B, 2B and 3B open and close the side line switch A and the transformers 1B, 2B and 3B.
From the operating state of the auxiliary relay contact due to the opening and closing of the B side line switch B, the parallel operation state due to the combination of various transformers can be detected automatically and easily.

FIG. 4 is a block diagram showing one embodiment of a circuit for outputting a tap up / down control command of the tap switching control section 6-1B, among the tap switching control devices of the transformer according to the first aspect.

In the figure, 110 is the central monitoring and control device 8
Tap elevation commands 111, 112 and 113 are auxiliary relays 135 of a master-slave automatic switching control circuit shown in FIG.
(Or 136, 137), 1B main control output, 2B main control output, 3B main control output, and 114 and 115 are tap switching control units 6-2B corresponding to the transformers 2B and 3B. This is a tap elevating control command sent from 6-3B.

Reference numeral 116 denotes an abnormality detection output of the device such as the self-motor 4-1B and the self-tap switching control unit 6-1B. 117 receives the abnormality detection output 116, outputs "0", and locks the AND circuit 118. In this circuit, tap parallel control of the transformers 2B and 3B is performed instead of the transformer 1B during the parallel operation of the transformer when the device is abnormal. 119
Reference numeral 120 denotes a condition output of a master-slave switching abnormality detection circuit of the master-slave switching abnormality detection circuit shown in FIG. The output of either the master-slave switching abnormality condition output 119 or the tap deviation detection condition output 120 is NOT via the OR circuit 121.
The output of the circuit 122 is set to “0”, and the AND circuits 118 and 1
Lock both 23. As a result, at the time of parallel operation, not only the transformer 1B but also the tap lifting / lowering control of the transformers 2B and 3B are locked, and are excluded from the parallel operation. Therefore, in this case, measures such as switching the system configuration and switching the parallel operation to the single operation are taken.

Reference numeral 124 denotes a tap elevating / lowering command 110 output from the centralized monitoring and controlling device 8 and a self tap switching control section 6-1B.
And the 1B main control output 111 selected when the transformer 1B corresponding to the main is selected. If there is no abnormality at this time, the AND circuit 118 is established and the other tap switching control unit is tapped. Along with outputting the elevating control command 125, it outputs a tap elevating control command 127 to the electric motor 4-1B corresponding to the own tap switching control unit 6-1B via the OR circuit 126. The so-called first tap elevating control means is executed.

On the other hand, the second first tap elevating control means executes the following processing. That is, the AND circuit 128 is established by the 2B main control output 112 selected when the transformer 2B is the main and the tap elevation control command 114 from the tap switching control device 6-2B corresponding to the transformer 2B, and the OR circuit 129 is formed. If there are no abnormalities through the above, the tap elevation control command 127 is output to the electric motor 4-1B corresponding to the own tap switching control unit 6-1B via the AND circuit 123 and the OR circuit 126. An AND circuit 130 is established by the 3B main control output 113 selected when the transformer 3B is the main and the tap up / down control command 115 of the tap switching control unit 6-3B corresponding to the transformer 3B, and the above-described transformer is formed. Motor 4-1 corresponding to own tap switching control section 6-1B as in 2B
A tap elevating control command 127 is output to B.

Therefore, according to such a circuit configuration, the tap switching control units 6-1B, 6-2B,
Although the 6-3B is provided, the tap lifting / lowering control commands 125 and 127 are simultaneously output only from the tap switching control unit corresponding to the main transformer during the parallel operation of the transformers. Can be simultaneously performed.

Next, FIG. 5 shows a master-slave automatic switching control in the event of an abnormality of the self tap switching control unit 6-1B including the self motor, among the transformer tap switching control devices according to the first and second aspects. It is a block diagram of a circuit.

This master-slave automatic switching control circuit preliminarily configures the relationship between the master and the slaves (control priority) of the transformers 1B, 2B, 3B. The purpose is to automatically change the transformer of the master according to the master-slave relationship determined.

8, reference numeral 131 denotes a contact which is opened when, for example, there is an abnormality in taking in CB and LS conditions or when it is inconvenient to mainly use any transformer as shown in FIG. That is, for example, when the CB and LS conditions are fetched abnormally, since the parallel operation conditions in FIG. 3 cannot be trusted, the operation is opened when all the transformers 1B, 2B, and 3B are slaves. 108a and 109a are contacts that are closed when the auxiliary relays 108 and 109 operate during the parallel operation of the transformers;
Reference numerals 2, 133, and 134 denote tap switching control units 6-1B, 6-2B, and 6-B corresponding to the transformers 1B, 2B, and 3B, respectively.
Contacts to be opened when abnormality of 3B occurs, 135, 136, 137
Is an auxiliary relay for determining whether the transformers 1B, 2B, 3B are main or subordinate, and has a function that operates when the main unit is main.

When the transformer 1B is the main, the contacts 135b1 and 135b2 are opened by the operation of the auxiliary relay 135, and the auxiliary relays 136 and 137 are deactivated so that the transformers 2B and 3B become slaves. When the tap switching control unit 6-1B corresponding to the transformer 1B is abnormal, the auxiliary relay 135 is disabled and the auxiliary relay 1 is closed by closing the contact 135b1.
36 operates, and the transformer 2B is mainly used. At this time, the contact 136b is opened and the auxiliary relay 137 is similarly deactivated, so that the transformer 3B is driven.

Next, priorities are prioritized in ascending order of the transformers using the circuit of FIG. 5 as described above, and when the tap switching control unit 6-1B (or 6-2B, 6-3B) is in an abnormal state, An operation example of automatically switching the relationship will be described.

Now, it is assumed that the transformers 1B, 2B, 3B are in a parallel operation state. At this time, if there is no abnormality in the tap switching control unit, the auxiliary relay 135 operates and determines that the transformer 1B is the main. At this time, as described above, the contact 135
Since b1 and 135b2 are open, the auxiliary relays 136 and 13
7 is inoperative, so it is determined that the transformers 2B and 3B are slaves. As a result, by the operation of the auxiliary relay 135,
The 1B main control output 111 is supplied to the AND circuit 124 in FIG.

In the above state, for example, tap switching control section 6-1B including motor 4-1B corresponding to transformer 1B
Is abnormal, the contact 132 is opened, the auxiliary relay 135 is deactivated, and the transformer 1B is switched from the main to the sub. At this time, since the contact 135b1 is closed,
The auxiliary relay 136 is operated, and the transformer 2b is mainly used.

Further, in the above state, tap switching control section 6-2 including motor 4-2B corresponding to transformer 2B.
When there is an abnormality in B, the contact 133 is opened,
The auxiliary relay 136 is deactivated, and the transformer 2B is switched from main to sub. At this time, the contacts 135b2, 136b
Is closed, the auxiliary relay 137 operates, and the transformer 3B becomes the main.

In the case of the transformers 2B and 3B, FIG.
When the auxiliary relays 108 and 109 do not operate due to the above configuration, the contacts 108a and 109a are opened, so that the auxiliary relays 136 and 137 operate and the transformers 2B and 3B
Are switched from the master to the slave, and the transformer 1B can be mainly used.

In addition, when the tap switching control section including the motor is abnormal, the main is automatically switched to the slave, so that it is also excluded from the tap deviation detecting circuit shown in FIG. 7 described later.
According to the above configuration, when a plurality of transformers are operated in parallel, priorities are assigned in the order of the smallest number in advance, and the transformer with the smallest number, eg, 1B, is mainly used. When the tap switching control unit 6-1B performs an abnormality, the main unit is changed in the order of the transformer 2B and the transformer 3B according to the master-slave order of the lowest priority. The operation can be continued using any one of the transformers, and all the transformers are not used unlike the related art, and the range in which the trouble is caused can be minimized.

FIG. 6 is a block diagram showing one embodiment of the master-slave switching abnormality detection circuit 119 in the transformer tap switching control apparatus according to the third to fifth aspects of the present invention. 141, 142 and 143 are auxiliary relays 1 shown in FIG.
35 is the output when the operation is performed, that is, the main / sub condition output when the transformer 1B is mainly used. 145 and 146 are shown in FIG.
Relay 1 that is the parallel operation condition of transformers 2B and 3B
When the transformer 2B is operated in parallel with the main transformer 1B, the operation outputs 08 and 109 and 147 are AND circuits formed by the secondary condition output 142 and the transformer 2B parallel operation condition output when the transformer 2B is operated in parallel. Similarly, when the transformer 3B is operated in parallel with the main transformer 1B, the secondary condition output 1
A that is satisfied by the output 43 and the transformer 3B parallel operation condition output
This is an ND circuit. Therefore, when the condition output 142 is the main, that is, the condition that the master-slave switching is abnormal is not satisfied, the AND circuit 148 is not satisfied when the condition output 143 is the main, and the AND circuit 148 is not satisfied when the condition output 143 is main. .

149 is an output 141, 142, 14
3 is a mismatch detection unit that outputs a mismatch signal when there is a mismatch, which is normally a combination of transformers 1B and 2B, 1B and 3B, and therefore outputs 141, 142 and 143.
Output, a mismatch signal is output. 1
Reference numeral 50 denotes a majority detection unit, which includes transformers 1B and 2
B, 1B and 3B, the output 1
When 41, 142 and 143 are collated, the own device, for example, 1
The B side, that is, the 1B main control output 141 is output as the majority side.

Reference numeral 151 denotes a NOT circuit, and 152, an AND circuit. These are output from the NOT circuit 151 even when a mismatch signal is output from the mismatch detector 149, when a majority output is output from the majority detection circuit 150. The AND circuit 152 is locked, and it is determined that the master-slave result is normal.

However, when the own device side becomes the decimal side,
Since there is no output from the majority detector 150, the AND circuit 15
2 cannot be locked, it is determined that the master-slave switching is abnormal, and the master-slave switching abnormal signal 153 is output.

As described with reference to FIG. 4, when an abnormality is detected in the tap switching control unit, the main is switched to the subordinate based on FIG. 5, so that it is excluded from tap switching targets, and unnecessary tap deviation detection is not performed. Control.

Thus, according to the configuration of the master-slave switching abnormality detection circuit as described above, when the master-slave switching is performed normally, even if the mismatch detector 149 does not match, the majority detector 151 detects the majority. At the time of output, the AND circuit 152 is locked to determine that the master-slave switching is normal.
When 0 is the decimal output, the master-slave switching abnormality is determined without locking the AND circuit 152. Therefore, it is possible to easily specify whether the abnormal tap switching control unit is the own tap switching control unit or the other tap switching control unit, and quickly. Recovery from abnormal conditions can be performed. Also, there is no need to lock unnecessary tap switching control units,
Normal transformers are continuously available.

FIG. 7 is a block diagram showing an embodiment of the tap shift detecting circuit 120 of the transformer tap switching control device. 161, 162, 163 are each transformer 1
The tap position information of the dial switch that switches according to the tap positions of B, 2B, and 3B, and is obtained from the electric motors 4-1B, 4-2B, and 4-3B shown in FIG. 145, 146 are transformers 1B and 2B, 1B and 3B
The operation outputs 164 of the auxiliary relays 108 and 109 operating during the parallel operation of the transformer B2 are determined based on the combination of the tap position information 162 corresponding to the transformer B2 and the operation output 145 of the auxiliary relay 108. The AND circuit 165 that outputs as the mismatch detection target outputs the transformer B3 that is operating in parallel from the combination condition of the tap position information 163 corresponding to the transformer B3 and the operation output 146 of the auxiliary relay 109 as the mismatch detection target. This is an AND circuit.

The tap deviation detecting section is provided with a mismatch detecting section 166 and a majority determining section 167. This mismatch detector 166 is connected to the transformers 1B and 2B or 1B.
During the parallel operation of 3B and 3B, a mismatch signal is output when there is a mismatch between the tap position information 161 and the output of the AND circuit 164 or 165, that is, when the outputs of the tap position information 161 to 163 do not match.

The majority decision unit 167 determines the tap position information 16
The outputs of Nos. 1 to 163 are collated, and when the auto-transformer 1B is the majority side, a majority signal is output. 168 is a NOT circuit,
Reference numeral 169 denotes an AND circuit, which locks the AND circuit 169 with the NOT circuit 168 even if a mismatch signal is output from the mismatch detection unit 166 if the number of the auto-transformers 1B is large, so that the tap shift detection error does not occur. . Discrepancy detector 16
6, when the majority signal is not output from the majority decision unit 167, the tap misalignment error 170
Is output.

Therefore, according to the above configuration, when a tap shift occurs, it is possible to easily specify whether the tap shift is on the self-transformer side or on the other transformer side. As a result, when a tap shift occurs, the abnormality can be quickly recovered, and a component such as the tap switching control unit is not carelessly locked.

FIG. 8 is a block diagram showing an embodiment of a monitoring circuit for a parallel control condition, particularly, of the transformer tap switching control device. In the same figure, 171 and 172 are pallet conditions for the 1B side upper LS connected to the upper A bus shown in FIG. 11, and 171 is a contact that closes when entering the upper LS.
Reference numeral 2 denotes a contact that closes when the instep LS is turned off, 173 denotes an auxiliary relay having a self-holding function, 173OP denotes an operation coil, and 173DO denotes a return coil. That is, contact 1
When 71 is closed, the operating coil 173OP operates, the contact 173a is closed, and the contact 173b is open. When the contact 172 is closed, the return coil 173DO operates, the contact 173b is closed, and the contact 173a is open.

The auxiliary relay 174 turns off the contacts 171 and 173a when the switching of the instep LS is performed normally.
Alternatively, when the contacts 172 and 173b are closed and operated, it is determined that the instep LS has been normally switched.

For example, even if the contact 171 is closed,
When 3a is not closed, the auxiliary relay 174 does not operate, so that it is determined that the switching of the instep LS is abnormal. Although FIG. 8 illustrates only the instep LS on the instep A bus side, it is possible to determine the normality of the LS on the instep A bus side and the bus CB by switching the parallel control using the same monitoring circuit.

Next, a description will be given of an embodiment of a transformer tap switching control device for solving the above-described problem of the second conventional example. FIGS. 9 and 10 are block diagrams showing one embodiment of the tap deviation detecting circuit, particularly, of the transformer tap switching control apparatus according to the sixth aspect of the present invention. This figure 9
Is a tap information detection system for detecting tap information. Specifically, a dial switch 181 having 23 taps for one bank, and a dial switch 181
And an auxiliary relay circuit 182 for taking in tap information from the CPU. In the auxiliary relay circuit 182, a selection line 183 for selecting each tap of the dial switch 181 in a predetermined order is derived from the power supply line P, and a tap information capture line 184- is individually provided from each tap of the dial switch 181. Auxiliary relays 182-1 to 18-18 for taking in tap information indicating tap positions via 1 to 184-23
2-23 are provided, and these auxiliary relays 182-1 to 182 are provided.
-23 are connected to the power supply line N. In addition,
The circuit shown in FIG. 9 is provided for each bank.

The operation of the tap information detecting system configured as described above will be described. When tap information "1" is output from dial switch 181, auxiliary relay 182-1
Operates, and when the tap information “2” is output, the auxiliary relay 182-2 operates.
83-3,..., It is possible to detect which tap of the dial switch 181 is being selected. That is, by providing the auxiliary relays 182-1 to 182-23 for each tap unit, the tap being selected can be detected from the operation of the auxiliary relays 182-1 to 182-23.

For example, if the tap information of the X bank is “3”, Y
If the tap information of the bank is “4”, the auxiliary relay 182-3 operates according to the tap information “3”, and the auxiliary relay 182-4 operates according to the tap information “4”.
The tap information of the X bank does not match the tap information of the Y bank.

FIG. 10 is a block diagram of a tap shift detecting system for detecting a tap shift between banks based on the operation of the auxiliary relays 182-1 to 182-23 of the tap information detecting system of FIG. In this tap shift detection system, a series circuit of an auxiliary relay contact group circuit 185 and an auxiliary relay 186 in an excited state when there is no tap shift is interposed between the power supply line P and the power supply line N. This auxiliary relay contact group circuit 185
Is NO. Auxiliary relay for one bank 182-1 to 182-23
Contact group 187 and NO. Auxiliary relay for 2-bank 182-1
182-23 contact groups 188 are connected using a multi-core cable 189 so that the contacts related to taps having the same number are connected in series.

Also, the auxiliary relay 1
86 is connected to the power supply line N through a series circuit of a contact 186x and an auxiliary relay timer 190.
A connection line between 6x and the timer 190 is connected to a power supply line N via a timer contact and an auxiliary relay 191.

According to the configuration as shown in FIG. 1 bank auxiliary relay contact group 187 and NO. If the contacts at the same tap position with the two-bank auxiliary relay contact group 188 are in the ON state, the auxiliary relay 186 operates, and it can be determined that there is no tap deviation between the banks. At this time, the b contact 188x of the auxiliary relay 186 is in the off state.

By the way, NO. 1 bank auxiliary relay contact group 187 and NO. Auxiliary relay contact group for two banks 188
If the contacts at different tap positions are turned on,
The auxiliary relay 186 becomes inactive, and the auxiliary relay 186 becomes inoperative.
Is turned on, the auxiliary relay timer 190 starts operating, and after the settling time (seconds) of the timer 190, the auxiliary relay 191 operates to display a failure state externally and to tap between banks. Judgment is made as a shift and the tap switching control of the bank is locked.

Therefore, according to the above embodiment, the auxiliary relays 182-1 to 182-23 are individually connected to each tap of the dial switch 181 of each bank, and the auxiliary relays 182-1 of a plurality of banks are connected. After connecting the contact group 187 and the contact group 188 in the order of 182-23 in series for each tap of the same number, the auxiliary relay 186 is further commonly connected, so that the operation of the auxiliary relay 186 can be surely determined. It is possible to detect the same tap selection between banks and a tap shift between banks.

FIG. 11 is a block diagram showing another embodiment of the tap deviation detecting circuit. A tap information detection system in the tap deviation detection circuit includes a dial switch 181 ′ that derives a tap information fetch line that fetches tap information by commonly connecting every predetermined number of taps out of 23 taps for one bank; This dial switch 18
Auxiliary relay 1 for each information acquisition line derived from 1 '
, And an auxiliary relay circuit 192 provided with the auxiliary relay circuits 92-1. That is, instead of receiving tap information from the dial switch 181 'in tap units, the auxiliary relays 192-1,... Are aggregated in a relationship of the number of taps N: 1 (N is an integer of 2 or more) of the dial switch 181'. The auxiliary relay circuit 192 is provided.

The tap shift detection system is the same as that shown in FIG. Now, a specific tap information detection system when N = 4 will be described. Dial switch 1
When the tap information of 81 'is "1 + 4n (n = 1 to 5)", the auxiliary relay 192-1 operates and the tap information becomes "2 + 4n".
4n (n = 1 to 5) ", the auxiliary relay 192-2 operates. When the tap information is" 3 + 4n (n = 1 to 5) ", the auxiliary relay 192-3 operates. 4 + 4n
(N = 1 to 5) ", the auxiliary relay 192-4 operates.

FIG. 11 shows a configuration example of one bank, and is provided for each bank. The operation of such a tap information detection system will be described.

For example, if the tap information of the X bank is “15”,
Assuming that the tap information of the Y bank is “16”, the auxiliary relay 192-3 operates with the tap information “15” and the auxiliary relay 192-4 operates with the tap information “16”. Since the auxiliary relay contact of the X bank and the Y bank relay contact do not match and the auxiliary relay 186 of FIG. 10 does not operate, the tap deviation between the banks can be detected.

Assuming that the tap information of the X bank is “1” and the tap information of the Y bank is “5”, both auxiliary relays 192-1 are provided based on the moss tap information “1” and “5”. Operates, and it is impossible to detect a tap shift between banks. However, when banks are used together, the operation is started after adjusting the tap positions. Since the tap deviation between the banks can be detected when the positions are shifted by one or two positions, there is no problem in normal operation.

Although the dial switch taps of each bank are distributed to the four auxiliary relays 1902-1 to 192-4 here, for example, m distributions (m = 2 to 2)
3) can also be performed. For example, if m = 2, it can be realized by the auxiliary relay circuit 192 having two auxiliary relays. Also in FIG. 11, the dial switch 181 'and the auxiliary relay circuit 192 are connected by a multi-core cable. At this time, the number of multi-core cables between banks can be reduced according to the number of auxiliary relays.

Therefore, according to the above configuration, each tap of the dial switch 181 'of each bank and the auxiliary relay are connected in an N: 1 relationship (N is an integer of 2 or more), and each bank is connected to each other. After the contact groups of the auxiliary relays are taken in and connected in series, the auxiliary relay 186 is connected in common, so that the same tap selection between banks and the tap deviation between banks can be reliably determined based on the operation of the auxiliary relay 186. Can be detected, and the number of multi-core cables of the dial switch 181 'and the auxiliary relay circuit 192 can be reduced.
In turn, this contributes to cost reduction.

FIG. 12 is a diagram showing still another embodiment of the tap deviation detecting circuit. This tap deviation detection circuit is provided by the auxiliary relay circuit 192 for each bank described with reference to FIG.
, The auxiliary relay circuit 192 having auxiliary relays 192-1,... Integrated at N: 1 (N is an integer of 2 or more) with respect to the number of taps of the dial switch 181 ', and Contact information D of the auxiliary relays 192-1,...
I is taken in, the contact information DI for each bank is compared, and a tap deviation is detected.

A description will be given according to the flow of FIG.
NO. The relay contact information DI (187 in FIG. 10) of the one-bank auxiliary relay circuit 192 is fetched (ST1) and set as the input value 1 (ST2). At the same time, NO. The relay contact information DI of the auxiliary relay circuit 192 for two banks (FIG. 1
188) is taken in (ST3) and set as the input value 2 (ST4). Thereafter, the input value 1 and the input value 2 are compared (ST5), and if they match, "0" is set in the tap deviation determination flag area (ST6). "1" is set (ST7). Therefore, when the flag in the determination flag area is “1”, it can be determined that there is a tap shift between banks.

FIGS. 13 and 14 are block diagrams showing still another embodiment of the tap deviation detecting circuit.
The tap shift detecting circuit includes a tap information detecting system for detecting tap information of a dial switch in a bank, and an auxiliary relay operation monitoring system for monitoring operation of an auxiliary relay constituting the tap information detecting system.

As shown in FIG. 13, the tap information detecting system is, for example, a dial switch 181 ″ of 23 taps per bank.
For example, duplicated auxiliary relays (193-11, 193-12), (19) that operate by taking in tap information of the same number for each tap of these dial switches 181 ″.
3-21, 193-22), auxiliary relay circuit 193 having ...
And is constituted by. The circuit configuration shown in FIG. 13 is provided for each bank.

The auxiliary relay operation monitoring system includes an auxiliary relay contact group circuit 19 between the power supply line P and the power supply line N.
4 and an auxiliary relay 195 are interposed in series.
This auxiliary relay contact group circuit 194 is, for example, NO. The auxiliary relay 193-11 of the auxiliary relay circuit 193 for one bank,
193-21,... As in the contact group 196 of NO. Each auxiliary relay 193-12 of the auxiliary relay circuit 193 for one bank, 1
12-22,... Are connected by taps having the same number. For connection of individual tap positions,
The contact a of the auxiliary relay 193-11 and the contact b of the auxiliary relay 193-12 corresponding to the tap information 1 are connected in series, and the contact b of the auxiliary relay 193-11 and the auxiliary relay 193 are connected.
-12 a contact is connected in series. A contact of auxiliary relay 193-21 and auxiliary relay 193-2 corresponding to tap information 2
And the auxiliary contact 193-2.
2 is connected in series with the contact a of the auxiliary relay 193-22. Hereinafter, similarly, the a contact of one auxiliary relay and the b contact of the other auxiliary relay corresponding to the tap information of the same number are connected in series, and the b contact of one auxiliary relay and the a contact of the other auxiliary relay are connected. Are connected in series.

Further, the auxiliary relay 1
95 is connected to the power supply line N through a series circuit of a contact 195x and an auxiliary relay timer 198.
A connection line between 5x and the timer 198 is connected to a power supply line N via a timer contact and an auxiliary relay 199.

Next, the operation of the above-described tap deviation detecting circuit will be described. When the tap information of the dial switch 181 "is" 1 ", the auxiliary relays 193-11, 193-1
When 93-12 operates and the tap information is "2", the auxiliary relays 193-21 and 193-22 operate. Similarly, two auxiliary relays having a connection relationship operate according to the tap information.

Here, monitoring of the tap information 1 by the auxiliary relay operation monitoring system will be described. Now, when the auxiliary relay is normal, the auxiliary relay 193-11 and the auxiliary relay 193-1
2 always performs the same operation.

As a result, a series connection circuit of the a-contact of the auxiliary relay 193-11 and the b-contact of the auxiliary relay 193-11, and the b-contact and the auxiliary relay 193-1 of the auxiliary relay 193-11.
The series connection circuit with the contact a of No. 2 is always open circuit, and the auxiliary relay 195 does not operate.

However, when the auxiliary relay is defective, it does not operate even if the tap information is 1, and does not return even if the dial position information becomes another dial position information. Operation does not match with 193-12.

Therefore, when the auxiliary relay becomes defective as described above, the auxiliary relay 1 and the series connection circuit of the a-contact of the auxiliary relay 193-11 and the b-contact of the auxiliary relay 193-12.
The series connection circuit of the contact b 93-11 and the contact a of the auxiliary relay 193-12 is always closed, and the auxiliary relay 195 operates. Thereby, the a contact 19 of the auxiliary relay 195
5x is turned on, and the auxiliary relay timer 198 starts operating. Then, the settling time of the auxiliary relay timer 198 (T
Seconds), the auxiliary relay timer contact turns on and the auxiliary relay 1
99 operates to externally display a failure state and lock the tap switching control of the tap deviation bank.

The auxiliary relay 193-11 and the auxiliary relay 193
-12-11. For example, it is possible to use the relay contact of the auxiliary relay 193-11 for detecting a tap deviation between banks and use the other auxiliary relay 193-12 for monitoring the auxiliary relay. It is possible.

The same processing is performed for the contacts of the auxiliary relays related to the tap information 2 to 23. Further, the process of detecting a tap shift between banks is the same as the case described with reference to FIG. 10 described above, and a description thereof will not be repeated.

According to the above-described configuration, taps of the dial switch 181 ″ are received by using, for example, duplicated auxiliary relays, and the a-contacts and b-contacts, and the b-contacts and a-contacts of these duplicated auxiliary relays are received. Are alternately connected in series, and the auxiliary relay 195 is connected in series with these series connection circuits, so that good and bad operations of the two auxiliary relays can be monitored from the ON / OFF operation of the contacts, and the tap deviation between the banks can be detected. it can.

[0104]

As described above, according to the present invention, the tap switching control unit can be minimized to the extent that trouble occurs during maintenance or maintenance. In addition, when an abnormality is detected in the tap switching control unit or when a tap deviation of the transformer is detected, it is possible to easily identify which of the tap switching control units is abnormal or which of the taps, and thus to achieve quick recovery.

Further, the number of dial switches per bank can be reduced, the tap deviation between banks can be reliably detected, and the quality of an auxiliary relay for detecting tap information of the dial switch can be monitored. Can be detected with high accuracy.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a transformer parallel operation state using a transformer tap switching control device according to the present invention.

FIG. 2 is a schematic configuration diagram for acquiring tap information of a transformer.

FIG. 3 is a configuration diagram of a parallel operation detection circuit which is one embodiment of a transformer tap switching control device.

FIG. 4 is a configuration diagram of a tap elevating control circuit which is another embodiment of the tap switching control device of the transformer.

FIG. 5 is a block diagram of a master-slave automatic switching control circuit which is another embodiment of the transformer tap switching control device.

FIG. 6 is a configuration diagram of a master-slave switching abnormality detection circuit that is another embodiment of the transformer tap switching control device.

FIG. 7 is a configuration diagram of a tap deviation detecting circuit which is another embodiment of the transformer tap switching control device.

FIG. 8 is a configuration diagram of a parallel control condition monitoring circuit as another embodiment of the transformer tap switching control device.

FIG. 9 is a configuration diagram of a tap information detection system of a tap deviation detection circuit which is another embodiment of the transformer tap switching control device.

FIG. 10 is a configuration diagram of a tap shift detection system which is another embodiment of the transformer tap switching control device.

FIG. 11 is a configuration diagram of a tap information detection system of a tap deviation detection circuit, which is another embodiment of the transformer tap switching control device.

FIG. 12 is an explanatory diagram of an operation of a tap deviation detecting circuit which is another embodiment of the transformer tap switching control device.

FIG. 13 is a configuration diagram of a tap information detection system of a tap deviation detection circuit which is another embodiment of the transformer tap switching control device.

FIG. 14 is a configuration diagram of a tap deviation detection system which is another embodiment of the transformer tap switching control device.

FIG. 15 is a system configuration diagram showing a conventional transformer parallel operation state.

FIG. 16 is a configuration diagram of a monitoring and control system including a conventional transformer tap switching control device.

FIG. 17 is a configuration diagram of a conventional tap switching control unit.

FIG. 18 is a configuration diagram of a conventional tap information detection system.

FIG. 19 is a system configuration diagram when a transformer is provided in each of a plurality of banks.

FIG. 20 is a system configuration diagram for performing conventional parallel operation of transformers between banks.

FIG. 21 is a diagram showing an example of detecting a tap deviation of a transformer straddling between banks.

[Explanation of symbols]

1B, 2B, 3B: Transformers 4-1B to 4-3B: Electric motors (dial switches) 6-1B to 6-3B: Tap switching control unit 108: First auxiliary relay 109: Second auxiliary relay 119: Master / slave Switching abnormality detection circuit 120: tap deviation detection circuit 135, 136, 137: auxiliary relay for transformer master / slave determination 149, 166: mismatch detection section 150, 167: majority decision detection section 173: auxiliary relay with self-holding function 174: Auxiliary relays 181, 181 ', 181 "Dial switch 182 Auxiliary relay circuit 185 Auxiliary relay contact group circuit 186 Auxiliary relay 190 Auxiliary relay timer 191 Auxiliary relay 192 Auxiliary relay circuit 193 Auxiliary relay circuit 194 Auxiliary Relay contact group circuit 195 ... Auxiliary relay 198 ... Auxiliary relay timer 199 ... Supplement Relay

Claims (6)

[Claims] 1. A transformer tap switching control device provided in each of transformers distributed in an electric station and performing tap switching control for a corresponding transformer. A transformer parallel operation detection circuit that detects transformer parallel operation electrically connected to the same bus, and a control priority in the transformer parallel operation is set in advance in the tap switching control device of each transformer, and A main controller determination circuit having the highest priority tap switching controller in the transformer parallel operation detected by the transformer parallel operation detection circuit as a main controller, and a tap elevating control command output by the main controller. And a control command output circuit for controlling each of the transformers in the transformer parallel operation state in parallel. 2. An apparatus according to claim 1, wherein when an abnormality occurs in the tap switching control device serving as the main control device, the tap switching control device in which the device abnormality has occurred is excluded from the main control device, and the transformer parallel operation is performed. A tap switching control device for a transformer, comprising: a switching circuit having, as a main control device, a tap switching control device having the next highest priority among the remaining tap switching control devices in an operation state. 3. The main control device determination information of each main control device determination circuit according to claim 1, wherein the main control device determination information of each main control device determination circuit of the tap switching control device in the transformer parallel operation state is collected. A mismatch detection circuit for detecting a mismatch between the main control device determination information of each main control device determination circuit and a main control device determination information of each collected main control device determination circuit. An abnormal device specifying circuit for specifying an abnormal tap switching control device in a majority decision. 4. A mismatch detecting circuit according to claim 1, wherein tap information of each transformer in the transformer parallel operation state is collected, and a mismatch detecting circuit for detecting a mismatch of the tap information of each transformer. An abnormal device specifying circuit that specifies an abnormal tap switching control device based on a majority decision of the collected tap information of each transformer when a mismatch of the tap information of the transformer is detected. Switching control device. 5. The transformer tap switching control device according to claim 3, wherein when the abnormal device specifying circuit specifies the abnormal tap switching control device, the transformer switching operation detection circuit detects a change in the transformer parallel operation detection circuit. The abnormal tap switching control is excluded from the parallel operation target, the control priority order of the main control device determination circuit, the mismatch detection target of the main control device judgment information of the mismatch detection circuit, or the mismatch detection target of the tap information of the mismatch detection circuit. A tap switching control device for a transformer, comprising a blocking circuit for locking tap elevation control of a transformer corresponding to the device. 6. A transformer tap switching control device provided in each of transformers distributed in an electric power station and performing tap switching control on a corresponding transformer, wherein the transformer is switched by a tap elevation control command. An auxiliary relay is connected to each of the tap positions or in common to a plurality of grouped tap positions, and a circuit that collects contact information of the auxiliary relay as tap information of a transformer and an electric connection depending on a connection state of a power system of the electric substation. Collects the tap information of the transformers connected to the same bus in a transformer parallel operation state,
A tap switching control device for a transformer, comprising: a tap deviation detecting circuit that detects a mismatch of tap information of each transformer and detects a tap deviation.