JPH0769746B2 - Load tap changer control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a priority order of a transformer or a bus among a plurality of load-equipped tap changers (hereinafter referred to as OLTC) with parallel operation. Select a reference transformer and a transformer that operates in parallel depending on it, depending on the bus connection conditions
It relates to an OLTC control device.

[Prior Art] FIG. 3 is a block diagram showing a conventional OLTC control device.
In the figure, (1) is a bus connection condition, and (2) is a priority pattern selection condition for selecting the reference / dependent selection logic function (3a) to (3n) for each priority pattern according to the priority pattern of the transformer or the bus. , (4) is a tap change control function for controlling the OLTC (5) according to the selected reference / dependent selection logic function.

The conventional OLTC control device is configured as described above, and the standard / dependent selection logic function (3a) to (for each priority pattern is selected according to the priority pattern selection condition (2) determined by the priority setting of the transformer or the bus. 3n) select one reference / dependent selection logic function, eg (3a),
The reference transformer and the subordinate transformer are selected by the selected reference / subordinate selection logic function (3a) and the busbar connection condition (1). Next, the tap switching control function (4) controls the OLTC (5) according to the selection condition.

[Problems to be Solved by the Invention] In a conventional OLTC control device, it is necessary to prepare a logic function for the number of combinations of transformers or buses, or to change the logic function each time the priority order is changed. However, there have been problems such as the complexity and size of the system, and the difficulty of changing the priority order.

The present invention has been made to solve the above problems, and an object thereof is to obtain an OLTC control device that can easily change the priority order of a transformer or a bus and also has a simple circuit configuration. .

[Means for Solving the Problem] An OLTC control device according to the present invention includes a storage device that stores the priority of a transformer or a bus as a numerical value, and a reference transformer that compares and calculates each priority according to a bus connection condition. And a computing device for inferring the selection of the subordinate transformer.

[Operation] In the present invention, the presence / absence of parallel connection between transformers is determined based on the bus connection conditions, and the priority rankings are compared in the parallel transformers to infer the highest priority ranking.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a block diagram of an OLTC control device according to the present invention,
Similar to FIG. 3, (1) is a bus connection condition, (4) is a tap switching control function, and (5) is OLTC. (6) is a storage device for storing the priority of transformers or busbars, (7)
Is a computing device that selects a reference transformer and a subordinate transformer according to the bus connection condition (1) and the priority.

FIG. 2 is a flow chart showing an example of processing of the arithmetic unit in FIG.

In the OLTC control device configured as described above, first in step (S1), the arithmetic unit (7) takes in the priority order stored therein from the storage unit (6). Next, in step (S2), the computing device (7) sets the busbar connection condition (1).
To determine whether the transformers are operating in parallel. As a result, if the transformers are operated in parallel, that is, if there is a bus connection, the arithmetic unit (7) compares and calculates the priority of each transformer in step (S3), and if NO, the step (S
In 4), the lower priority b is changed to the higher priority a, but if YES, the upper priority a is changed to the lower priority b in step (S5). This comparison operation is repeated n times to infer the highest priority in the parallel transformer in step (S6). The reference transformer is selected from the highest priority obtained in this way, and the transformer corresponding to the lower priority changed to the higher priority is selected as the subordinate transformer. The result is output in step (S7).

After that, according to the selection condition of the reference transformer and the subordinate transformer obtained by the arithmetic unit (7), the tap switching control function (4) performs OLTC.
Control (5).

From the above, all priority patterns can be dealt with by inputting the priority data stored in the storage device (6) with the priority numbers 1 to n corresponding to each transformer.
Only one arithmetic processing function is required, and priority changes can be easily processed.

Although the arithmetic unit for selecting the reference transformer and the subordinate transformer and the tap switching control function are separately classified in the above-mentioned embodiment, even if they are combined into one using a sequencer or the like, the same effect as in the above-mentioned embodiment can be obtained. Play.

[Effects of the Invention] As described above, according to the present invention, a storage device that stores the priority of a transformer or a bus as a numerical value is compared with a reference transformer and a sub-transformer by comparing and calculating each priority according to a bus connection condition. Since the arithmetic device for inferring the selection is provided, the priority of the transformer can be easily changed by simply changing the priority data stored in the storage device, and the device can be manufactured at low cost.
It also has the effect of realizing a highly reliable OLTC control device.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an OLTC control device according to the present invention, FIG. 2 is a flow chart diagram showing an example of processing of an arithmetic device, and FIG. 3 is a block diagram showing a conventional OLTC control device. . In the figure, (1) is a bus bar connection condition, (4) is a tap switching control function, (5) is OLTC, (6) is a storage device, (7)
Is an arithmetic unit. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. When a plurality of load-equipped tap changer-equipped transformers are operated in parallel, a transformer that becomes a reference according to the priority of the transformers or the busbars and the busbar connection condition, and the subordinate operation in parallel with the transformer. In a control device for selecting a transformer to be stored, the priority of each transformer stored in the storage device according to the bus connection condition is compared with a storage device that stores the priority as a numerical value, and the bus is being connected. And a calculation device that performs calculation processing using the transformer having the highest priority as the reference transformer.