JPH0519002A - Locating apparatus for defective point dealing with reclosing - Google Patents

Abstract

PURPOSE:To improve the locating accuracy with location calculation data made when an accident continues even at the time of reclosing by setting two ring buffers in a data buffer of a calculation processing part and dividing data at the time of defect and data when reclosing fails separately. CONSTITUTION:Defective point locating apparatuses are provided at measurement points 1, 2 to correctly determined point where a failure occurred. A data buffer in a calculation processing part 5 is a ring buffer, wherein the newest data and oldest data are sequentially replaced with each other. Further an A/D converter 4 continues to collect failure data even after data transfer to the processing part 5 since a failure is determined, and when the buffer is full, data is transferred to the processing part 5. Then the processing part 5 does not perform failure analysis and separately sets a ring buffer of an equal capacity for starting re-measurement. In the case of a failure in reclosing, failure data is stored in both ring buffers, so that data is analyzed to locate a defective point. If reclosing is successful, the defective point is located only by the first ring buffer data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault point locating device for a high-voltage distribution line, and more particularly to a locating calculation data and a fetching method.

[0002]

2. Description of the Related Art A device for locating a failure point on a distribution line is an effective device for finding a failure occurrence point early and recovering it early. Conventionally, this device has a voltage at the time of failure of the receiving end,
Many methods have been proposed, such as an impedance calculation type using current and a line difference current locating method in parallel two lines, which have been put to practical use by using a microcomputer.

[0003]

In the above-mentioned device, the fault location calculation data is executed by the data at the time of the occurrence of the fault, but it corresponds to the reclosed circuit in which the circuit breaker is closed and then closed again. Was not there. Therefore, the orientation calculation had to be performed using only one piece of data when the accident occurred. The present invention provides orientation calculation data when an accident continues even when the circuit is closed again, and uses this data together with the data when the accident occurs to improve the orientation accuracy.

[0004]

In order to solve the above-mentioned problems, a failure point locating device of the present invention comprises means for detecting a failure from a zero-phase voltage and each phase current which greatly change at the time of failure.
Data of the voltage and current waveforms at the transmitting end and the receiving end at that time are stored, the voltage and current measurement is started again before the reclosing operation, and the data at that time is stored if the reclosing fails. Therefore, it was realized by providing two ring buffers as the data memory.

[0005]

In the fault point locating device using the present invention, a microcomputer in which a MC68020 is installed in a central processing unit is used, and a data buffer is a ring buffer and the latest data is sequentially replaced with the oldest data. The CPU obtains the amplitude value of a specific voltage and current for each cycle of the latest data, and determines whether it is a malfunction or a sound condition. When it is determined that there is a failure, the sound waveform and the failure waveform are stored in the first ring buffer. After that, the CPU does not analyze the fault location, starts the measurement of the voltage and the current again, and collects the data when the circuit is closed again. So the first ring buffer and the second
And the ring buffer of. In case of reclosing failure, only the fault waveform is stored in the second ring buffer. The fault localization is analyzed by using the data of both the first ring buffer and the second ring buffer. If the reclosing is successful, only the healthy waveform is stored in the second ring buffer. Therefore, the fault location analysis is performed only on the data in the first ring buffer.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of an apparatus for locating a failure point occurrence point of a distribution line utilizing the present invention. In the figure, 1 and 2 are measurement points at a substation, 3 is a distribution line, 4 is a data input section and an analog-digital conversion section, 5 is an arithmetic processing section, 6 is a simple communication device, and 7 is an existing communication line. is there. This equipment is installed at the measurement points 1 and 2, so that
It measures the electrical quantities at the power receiving end and accurately finds the point of failure from both data sent by the communication device.

As an input function, a maximum of 10 elements can be simultaneously sampled at a sambling speed of 100 μs. In the arithmetic processing unit 5, a ring buffer is used as the data buffer, and the latest data and the oldest data are sequentially replaced, and the capacity is 1024 kbytes. In addition, the analog-to-digital converter 4 has 64
There is a k-byte buffer, and even after the data transfer to the arithmetic processing unit 5 is stopped after it is determined to be a failure, the arithmetic processing unit 5 continues to collect the failure data when the buffer becomes full.
Transferred to. After that, the arithmetic processing unit 5 does not execute the failure analysis and starts the measurement again. Therefore, a ring buffer with the same capacity is set separately.

When the reclosing fails, the failure data is stored in both ring buffers, and the failure point is located by analyzing the data in both ring buffers. If the reclosing is successful, the measurement is terminated after a certain time has elapsed from the time when the measurement was started again, and the fault point is located only by the data of the first ring buffer.

[0009]

As described above, in the fault point locating device of the present invention, the fault point locating device with further improved accuracy is possible by setting the data buffer corresponding to the reclosing.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a fault location device.

[Explanation of symbols]

1 measurement point 2 measurement points 3 distribution lines 4 Data input section and analog-digital conversion section 5 Arithmetic processing unit 6 Communication device 7 communication lines

Claims (2)

[Claims] 1. The voltage at the transmitting end and the receiving end of the high-voltage distribution line,
In the device that locates the fault point of the high voltage distribution line by the current, the zero-phase voltage and each phase current that greatly change at the time of the fault,
A means to detect a failure, a means to store the voltage and current waveform data at the transmitting end and the receiving end at that time, and before the reclosing operation, start measuring the voltage and current again,
In the case of reclosing failure, a reclosing corresponding failure point locating device comprising means for memorizing the data at that time and locating the failure point by the data at the time of failure detection and the two data at the time of failure of reclosing. 2. The reclosing circuit according to claim 1, wherein the data memory is a ring buffer system, and the latest data is overwritten on the oldest data so that the latest data can be stored while the data memory capacity permits. Corresponding fault point locator.