JPS63231604A - Tap control system - Google Patents

Abstract

PURPOSE:To improve the workability by providing an operation processing part of a centralized control apparatus with a tap operation number operating means and a comparing means. CONSTITUTION:An input signal is inputted to an operation processing part 50, and a number DELTAT of times of tap operation is obtained in a tap operation number operating means 51 in accordance with DELTAT=chi-PI (chi is the target tap position signal and PI is the current tap position signal and is always inputted). The obtained number DT is compared with a comparison value by a comparing means 52, and a tap raising or lowering command is converted to a prescribed transmission format in accordance with the comparison result and is sent to a remote information transmission equipment 4. Thus, the tap operation is automatized and the tap value is arbitrarily designated at the time of completing the parallel driving operation of transformers.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a tap control system for Betelsen coils in transformers in substations.

13. Summary of the Invention When controlling transformer taps in a substation, the present invention uses a centralized monitoring control device to detect taps by calculating the difference between a target tap position signal and a current tap position signal detected by a tap position detector. Calculate the number of operations, compare the calculated result value with the comparison value, and control the tap up/down based on the results to automate the tap operation and change the tap value when the parallel operation of the transformer is completed. This allows for arbitrary specification.

C0 Conventional technology When a substation transformer is controlled to raise or lower taps of Petersen coils via an information transmission device in response to commands from a central monitoring and control device, the control is performed by an operator's command on the central monitoring and control device side. It is.

Conventionally, this command has been made to vary depending on the transmission means between the central monitoring control device and the information transmission device, and the relationship with the tap changer that is the controlled device, etc., in response to a single control signal input by the operator. ing.

D1 Problem to be solved by the invention If the current tap position is, for example, 11
If the operator wants to raise it to the 15th tap, the operator first issues a command to raise it to the 12th tap, and as a result, the position signal detected by the tap position detector changes to 1.
After confirming that the 2nd tap switching completion is displayed, proceed to the next step.
The operator inputs a command to raise the tap to the 3rd tap, and then repeats the necessary manual operations up to the 15th tap, which is extremely troublesome.

In addition, there are cases where a plurality of transformers are installed in the same substation and operated in parallel, but in this case, each transformer does not necessarily have the same rating or tap value, but is generally different.

When such transformers are operated in parallel, an association between both tongues is made at the substation in order to make the output voltages the same. For this reason, there have been problems in that the tap position cannot be arbitrarily set from the central monitoring control device side.

The present invention has been made to solve such problems.

Means for solving problem E1 The tap changer is controlled from the central monitoring control device of the substation via the information transmission device, the tap change result is detected by the tap position detector, and the detected value is sent via the information transmission device. In this device, the calculation processing unit of the centralized monitoring and control device is provided with a tap operation count calculation means and a comparison means.

The tap operation number calculation means calculates the number of tap operations by subtracting the target tap position signal and the current tap position detection signal, and the comparison means determines whether to raise or lower the tap based on whether the calculation result is large or small. It was designed to do so.

F. Example Hereinafter, the present invention will be explained in detail based on the drawings.

In FIG. 1, ``■'' is a transformer, and 2 is a tap changer, and this changeover 2 controls the switching of taps (not shown). 3 is a tap position detector which detects the current tap position via an auxiliary relay or the like. 4 is an information transmission device, and this transmission device 4 converts the input tap position signal into a transmission signal and sends it to the centralized monitoring and control device 5, and also converts the signal transmitted from the centralized monitoring and control device 5. and output to the tap changer 2. The centralized monitoring control device 5 has a calculation processing section 50 in addition to the operation input section, and the calculation processing section 50 includes a tap operation number calculation means 51 and a comparison means 52.

The operation of the device configured as described above will be explained.

A sequence control program is installed in the centralized monitoring and control device 5 in advance. This program includes programs for parallel operation of transformers and for raising and lowering taps in addition to general supervisory control.

If the tap position of the transformer 1 is to be increased from the 13th tap to the 15th tap, the operator inputs the 15th tap position signal in the centralized monitoring control device 5. This input signal is manually inputted to the arithmetic processing section 50, and the number of tap operations ΔT is determined by the number of tap operations ΔT by ΔT=χ−PI. (However, χ is the target tap position signal,
(PI is always input as the current tap position signal) The obtained ΔT is compared with a comparison value in the comparing means 52, and a tap raising command or tap lowering command is converted into a predetermined transmission format depending on the magnitude of the comparison result. and sent to the distant information transmission device 4.

Here, the current tap position signal 13 is input via the information transmission device 4, and the target tap position signal is 1.
5, so ΔT is 2. However, the signal sent from the central monitoring and control device 5 is based on the sequence control program, and first the information transmission device 4 sends a raise command to the 14th tap.
The signal is output to the tap changer 2 via the . The tap changer 2 switches from the 13th tap to the 14th tap, and this switching is detected by the tap position detector 3 and input to the central monitoring control device 5 through the information transmission device 4. The arithmetic processing unit 50 repeats this operation until the manually input current tap position signal and the target tap position signal 15 become equal. That is, FIG. 2 shows the flow of the arithmetic processing unit 50, in which PI-χ is compared in step Sl, and in the case of No, pt>χ is compared in step St. If NO, step S3. In S4, the tap-up operation is performed until PI=χ. On the other hand, if YES in step S, the tap-down operation is performed in steps Ss and S- until pt=χ. It should be noted that if the above operation result does not become -Pl=χ after a certain period of time has elapsed, it is regarded as abnormal and an abnormality display is performed.

Furthermore, although the above description has been made regarding the tap operation of a single transformer, tap control is similarly performed based on the sequence control program when the transformers are operated in parallel.

G2 Effects of the Invention According to the present invention, the operator is able to perform tap control with a single operation input, which eliminates the hassle of multiple operations as in the prior art and improves work efficiency. Further, since the operation signal is automatically output based on the calculation, it is possible to completely automate the tap operation. Furthermore, it has the advantage that any tap position control can be performed from the central monitoring control device regardless of the current tap position.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating an embodiment of the present invention, and FIG. 2 is a flowchart illustrating the operation. DESCRIPTION OF SYMBOLS 1... Transformer, 2... Tap changer, 3 - Tap position detector 1.1... Information transmission device, 5... Centralized monitoring control device, 50... Arithmetic processing unit, 51... Tap Operation count calculation means, 52...comparison means. Figure 1

Claims (1)

[Claims] In the case where an induction device is provided with a plurality of taps and the output electricity is adjusted by controlling the taps via a switch, a tap position detector is provided to detect the tap position, and this detector detects the tap position. Information transmission that converts the detected tap position detected value into data and transmits it to a distant centralized monitoring and control device, and outputs a tap change command to the tap changer based on the tap change command from the central monitoring and control device. In addition, the arithmetic processing unit of the central monitoring and control device is provided with a tap operation number calculation means for calculating the difference between the target tap position signal and the current tap position detection signal, and a comparison value with the calculation result value of the calculation means. and a comparison means for outputting a tap up/down command according to the comparison result.