JPS58144534A - Distribution line phase determination method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for determining the phase of power distribution and lines.

To comment further, at the end division point of high-voltage distribution lines? The purpose of this system is to determine the phase of a high-voltage distribution line while the high-voltage distribution line remains live.

In order to minimize the power outage section in the event of an accident such as a ground fault on a high-voltage distribution line, a normally open switch is installed at the end division point, and this normally open switch is closed only when a fly fault occurs. As a result, the power transmission route has been switched to a different one than the previous one, and the power transmission route is now being applied to the healthy part of the body after the accident point.

In this way, the normally open switch installed at the end division point of the high-voltage distribution line 1 connects the new power transmission line 1.1 to the load in the event of an accident. It is necessary to match the phase of the power transmission path with the phase of the load and connect the wires.

On the other hand, since the terminal ends of the distribution line are being newly installed in an incremental manner in response to the ever-expanding load, the terminal side of the distribution line.

@It is difficult to accurately recognize which phase the wire is in.

Conventionally, when installing normally open switches at these terminals,
When this normally open switch is installed, the high voltage power distribution line is temporarily cut off, and a signal is sent to the source side to any one phase.2 This given signal is then transferred to the normally open switch side The detected line'eIE source side of this signal is determined to be the same as the signal given phase, and the phase of the other line (rl, The phase was determined by

In this way, conventionally, in the f8 normally open switch, the phase between the source side and the load side 1? Judgment/Decision - Even though it's around the corner, the entire Hatsu line system will be temporarily stopped.

Services for consumers will decline.

The present invention was devised to solve the above-mentioned drawbacks and problems in the conventional example. 47-Create a quasi-earth fault within the range where the device does not operate,
It is necessary to use a ground fault phase detection circuit to detect the zero-sequence voltage generated by this simulated ground fault accident, thereby detecting the phase of the line where the simulated ground fault has occurred at the end division point.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Two embodiments of the present invention will be described below with reference to the drawings showing one embodiment thereof.

In the figure, M is the power supply side mainly consisting of the substation 1 that has a built-in protection device, and on this power supply side A, there are 2 high-voltage distribution lines tc extending from 4 wires 2a, 2b, and 2c drawn out from the substation 1. The high 1-mode distribution line 2 has a reference sum 1 voltage and a zero-sequence voltage synthesized from the line-to-line 1σ and voltage of the ordinary electric wires 2a, 2b, and 2c, which do not change even if a ground fault occurs. A ground fault phase detector 3 is provided for detecting a ground fault phase based on the phase relationship.

Other power #B 11' Well, strange! At one of the many end division points of the distribution line 2 arranged in a dendritic manner from the FIT 1, unidentified electric wires 21, 22.
“Shi, 3 cars L ruru.

Now, to know the phase of @ wire 21, 22, 23 at this end division point B, connect each wire 21, 22, 23 to @ wire 21, 22.
This is achieved by creating a simulated ground fault through an impedance 5 set to a predetermined value every 23 degrees.

In the case of the illustrated embodiment, in order to easily perform the cross-ground fault operation of each electric wire 21, 22, 23 via the impedance 5,
A switch 4 is connected in series to an impedance 5.

The impedance 5 is
When conducting a simulated ground fault on electric wires 21, 22, and 23.

A simulated ground fault was caused through this impedance 5'#2
The value of the zero-sequence voltage generated at 1, 22, and 23 is sufficient for the ground fault detector 3 installed at 11° on the power supply side to detect the ground fault phase. The protection device is set to a value such that it will not operate.

Therefore, from the state shown in 9, switch 4 is closed and tii
When a ground fault occurs through the 121'V impedance 5, the ground fault detector 3 on the source side A is activated and detects that the line 2a corresponding to M21 has a ground fault. indicates that there is a ground fault.

In the ground fault detector 3 on the power supply side A, the Zokukan line 2a,
Since the phases of wires 2b and 20 are known in advance, by knowing the detected wire 2aq, it is possible to know the phase of the wire 21 that is subjected to the simulated ground fault at the end division point B.

The result detected by the ground fault detector 3 on the power supply side A is notified to the twisted end division point B, and from this, the end division point B can know the phase of the electric wire 21 that has caused the simulated ground fault. It is.

In this way, the present invention intentionally generates a simulated ground fault by utilizing the function of the ground fault phase detector 3, and thereby
．． This is because the students are asked to distinguish between 23 phases.

The power distribution line 2 can be maintained in a live state.

In addition, the zero-sequence voltage generated by the simulated ground fault is variable and
Impedance 5 is set so that the protection device installed in the circuit will not operate.

During implementation of the method of the present invention, there will be no inconvenience in which the power distribution line 1 and line 2 are in a power outage state due to the maintenance device being activated.

In order to carry out the phase discrimination method according to the present invention while ensuring more reliable non-operation of the protection device in the substation 1, the protection device installed in the substation 1 is connected to the wires 2a, 2b,
It will not operate unless the zero-sequence voltage generated at 2c exceeds a set value, and the zero-sequence voltage higher than this set value must be continuously output for a predetermined period of time or more. It is preferable that the simulated ground fault of the electric wires 21, 22, 23 be completed within the time set in the protection device by using the impedance 5.

As is clear from the above description, the present invention provides a predetermined 11 [
By the extremely simple operation of generating a simulated ground fault using an impedance with Y, it is possible to reliably identify the phase of each wire while the distribution line remains live. This is because it is also installed on power distribution lines.

In order to carry out the method of the present invention, it is only necessary to prepare an impedance set to a predetermined value iI=, which makes it easy to carry out and has excellent effects.

[Brief explanation of the drawing]

The figure is a circuit diagram for explaining the method of the present invention. Explanation of symbols l... Substation FJi, 2-... Distribution line, 2a,
2b, 2c, 21°22.23...Electric wire, 3
...Ground fault phase detector, 4...Switch. 5... Impedance, A... Power supply side, B... Terminal dividing point 2° Inventor: Shige Kurihara Inventor: Tomo Mochizuki Good inventor: Hikaru Endo - Applicant: Toko Electric Co., Ltd. Representative, Isamu Ki Applicant Tokyo Electric Power Company A B173

Claims (1)

[Claims] A ground fault is detected in the distribution line through the impedance, and the ground fault detector detects whether the ground fault is detected by the impedance. A distribution line that generates a zero-sequence voltage that is sufficient to detect but insufficient for operating a mining device in a substation, and uses the generated zero-sequence voltage to detect the phase of the phase-targeted distribution line using the ground fault detector. phase discrimination method.