JP2597022Y2 - Control device of tap changer under load - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a tap changer under load, and more particularly to a control device for simultaneously controlling the tap change of a plurality of tap changers under load.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional example of a control device for a load tap changer of this kind. This conventional example is for three on-load tap switching transformers (hereinafter referred to as banks) and includes a switching command circuit 1, a motor driving circuit 2, and a tap deviation detecting circuit 3 as shown in the figure. In addition, the code | symbol of the apparatus in the figure used the thing based on the automatic control instrument number of JEM (the same below).

In the switching command circuit 1, when 43SP is turned on, one of the inhibition circuits (in this example, the 90R side is closed) is energized to perform a switching command operation.
In the motor drive circuit 2, 43SP and 90RX
Is closed, the drive switch (not shown) is switched at 88X, the position detection switch (not shown) is turned on, and a predetermined motor (not shown) is turned on.
Activate In the tap deviation detecting circuit 3, the contacts of 33S are moved by driving the motor to switch the same tap of each bank connected thereto, while the 33SY of the switching command circuit 1 is opened by the operation of 33ST, and each load tap changer is opened. Adjust for differences in operating time between

[0004]

However, in the above-mentioned conventional control device, depending on the set time of the timer (usually about 10 seconds) between the banks operating in parallel, two banks are required.
There is a possibility that a shift of up to 3 taps may occur. Further, in order to perform the parallel operation, there is a place where the connection for adjusting between the banks is connected in series, that is, (2) and (3) of the switching command circuit 1 in FIG. In the case of parallel operation, it is necessary to short-circuit one 33SY, and the connection change is troublesome. Further, when a tap deviation occurs in the master unit and the slave unit, the detection and display of the tap deviation is performed on both sides,
Adjustment with other devices is required to improve reliability.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a highly reliable on-load tap changer control device which can reduce the tap deviation between a plurality of on-load tap changers and can freely change the number of connected tap changers. I have.

[0006]

In order to solve the above-mentioned problems, in the present invention, a switching command circuit for starting switching of taps of a plurality of on-load tap changers, and a contact is set to a predetermined tap in accordance with the switching command. In a load tap changer control device including a motor drive circuit for driving a motor for moving and a tap shift detecting circuit detecting a tap shift between a plurality of load tap changers, switching of other devices is performed. A waiting circuit that does not issue a switching command until all the operations are completed, and a step-by-step circuit that performs switching at a predetermined time after switching and prevents continuous switching are provided. On the other hand, the control device of the tap changer under load was constituted by connecting in parallel.

[0007]

In the control device of the present invention, even if the switching is completed in the main unit, the switching command circuit does not accept the next command by the waiting circuit until the switching of the other unit is completed. Therefore, one command and one operation are always ensured. In the step-up circuit, the operation of the switching command circuit is intermittently performed to prevent continuous switching. Since all the circuits related to the other devices including the tap deviation detecting circuit are connected in parallel to the main device, it is possible to freely change the applied device of the control device.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, the same components as those in the conventional example are denoted by the same reference numerals. The description of the same parts as in the conventional example is omitted for convenience.

In FIG. 1, the switching command circuit 1 is a 66X
66 is provided to be excited by closing the control signal, thereby opening the inhibition circuit and locking the command.

The queuing circuit 4 is provided with an 88Y which is excited by the switching operation and holds it until the switching between the main unit and the other unit is completed.

The stepping circuit 5 excites 66X by 88Y, and when 88Y is deactivated, the timer 66XT operates to deactivate 66X for a certain period of time. Tap deviation detection circuit 3
The timer 33ST is operated by the 33SX on the other device side, and after a lapse of a predetermined time, 33SY of the switching command circuit 1 is opened to adjust the difference in the operation time between the load tap changers.

In the control circuit of the embodiment having the above configuration, even if the switching is completed at 88X of the main unit, 88Y of the waiting circuit 4 is excited until the switching of the other unit is completed. Since 66 is also excited via 66X, the switching command circuit 1 is open and does not accept the next command.

For some reason, 90LX or 90R
When X is continuously excited, 88X and 66 are also continuously excited, so that the switching command circuit 1 does not accept the next command as described above. Therefore, one command and one operation are always ensured. In the stepping circuit 5, since the timer 66XT is activated by the deactivation of 88Y and the deactivated state of 66X for a certain period of time, the operation of the switching command circuit 1 66 is performed intermittently to prevent continuous switching. I do. Since all circuits related to other devices including the tap deviation detecting circuit 3 are connected in parallel, the device to be used can be freely selected.

[0014]

As described above, according to the control device of the on-load tap changer of the present invention, the tap deviation can be limited to at most one tap between the banks operating in parallel. Since all connections to the banks are connected in parallel, the bank to be controlled can be freely selected without changing the connection.In addition to the tap position detection contacts, all contacts for passing to other banks are electrical contacts. Therefore, there is an effect that reliability is high.

[Brief description of the drawings]

FIG. 1 is a sequence diagram of a control device of an on-load tap changer according to an embodiment of the present invention.

FIG. 2 is a sequence diagram of a conventional example of a control device for a load tap changer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Switch command circuit 2 ... Motor drive circuit 3 ... Tap shift detection circuit 4 ... Waiting circuit 5 ... Stepping circuit

Claims (1)

(57) [Scope of request for utility model registration] 1. A switching command circuit for starting switching of taps of a plurality of on-load tap changers, a motor driving circuit for driving a motor for moving a contact to a predetermined tap in accordance with a switching command, and a plurality of loads. A control device for a tap changer under load comprising a tap shift detecting circuit for detecting a shift of a tap between hour tap changers, a queuing circuit which does not issue a change command until switching of all other devices is completed, and A step-up circuit for performing switching at a predetermined time and preventing continuous switching, and a load tap switching device characterized in that related parts with other devices are connected in parallel to the main device. Control device.