KR20030090251A - The way of pointing faults on a buried cable - Google Patents

Abstract

PURPOSE: A method for investigating a leakage point of an underground buried electric cable is provided to detect correctly the leakage point by using an investigation method including a principle of earth gradient. CONSTITUTION: An investigation process is performed from one end of a leaked electric cable. A power supply operation and a load supply operation are interrupted during the investigation process. A clip of a black lead line(5) of a transmitter(1) is connected to a leakage reception bar(10) when the transmitter(1) is turned off. The leakage reception bar(10) is driven into the ground. A receiver(2,3) is loaded on an investigation frame(6). Two lead lines of the investigation frame(6) are inserted into two jacks of the receiver(2,3). The transmitter(1) is turned on. The investigation frame(6) is moved to a path of the leaked electric cable. A leakage point is detected by moving the investigation frame(6).

Description

The way of pointing faults on a buried cable

The present invention targets underground cables which cannot be visually checked and cannot be directly identified and accessed due to the non-exposure characteristics according to the specificity of the function and the installation specifications, causing breakage or holes in the outer insulation layer of the cable. When a short circuit occurs due to cutting or coating exposure, the present invention relates to an accurate and efficient exploration method that can catch and repair the ground fault on the ground. More specifically, the Earth Gradient principle is used to form a circuit of current consisting of a transmitter, a receiver, an electric leakage line, and an earth leakage receiver. The electrical state at the electric leakage point generated by the pulse movement and the tone level to be heard is formed. In this paper, the data received in the form of slope of the meter and tone intensity are analyzed appropriately to obtain accurate and accurate follow-up of the leakage point.

In general, in the case of wire cables selectively installed in the ground because the exposure on the ground is not desirable, the economical and irrational follow-up work is performed due to the invisibility and the lack of suitable available equipment during the earth leakage point detection work caused by the above cause. The work that could only be repaired was done as a complete replacement, resulting in a lot of material and time loss. This is because even the undamaged wires are replaced during the front replacement work.

As an example, when a ground fault of a underground cable for street lights occurs, the tester checks whether there is a short circuit and then, as a related tester equipment, starts at one end of the ground fault cable and detects the ground line, which leads to confusion in the direction setting due to the lack of accuracy. Even the exploration work by correct setting did not have the efficiency and effectiveness by replacing with a short circuit prediction section instead of capturing the ground fault point. If the leakage point is captured correctly, the scope of follow-up work can be determined locally, but in the case of the short-circuit prediction section, the follow-up work can be performed as if it was a front-end work.

In order to solve the above problems, the present invention invented an exploration technique applying the principle of Earth Gradient, and after forming an electric circuit composed and connected to a transmitter-an earth leakage line-(an earth leakage point)-an earth leakage receiving rod-a transmitter (transmitter) By generating voltage and current from the transmitter (transmitter) and flowing it along the circuit, it electrically reflects the physical state of the earth leakage point according to the flow of this current, and shows it as the inclination of the needle (pulse) in the meter system of the receiver. The direction of is indicated. The closer the distance to the leakage point is, the narrower the recoil width of the needle (pulse) is, so that it is guided to the material of the exact leakage point, so that a clear capture is achieved, and a four-segment detection method ensures a certain guarantee. In other words, if the above description is summarized again, the transmitter is connected to the start point of the ground fault line using the transmitter as the originating point, and the other lead is connected to the ground fault receiver to receive the short circuit radiated from the ground fault point of the ground fault line. It clearly identified and created rational measures for subsequent follow-up work, thereby promoting the economic use of costs.

In order to achieve the above object, the present invention, through the meter of the receiver by flowing a high-voltage signal from the transmitter along the circuit formed by including the leakage line after disconnecting the supply power and load from the leakage line Based on the analysis of the reflected pulse movement, the probe is brought closer to the material of the ground fault. In the case of coincidence between the probe and the earth leakage point, the receiver's instructions remain stationary, with "0". This process can be divided into the following steps: circuit formation step for receiving the leakage current, pulse transmission step of the transmitter, monitoring the fluctuation of the instructions reflected on the receiver meter during the earth leakage detection, It can be divided into the non-synchronous stage of the needle indicating almost 0% of the point, indicating a short circuit, and reconfirming the "zero" point in the orthogonal direction of the point. Be prepared to carry out the labeling reasonable follow-up.

1 is a block diagram of an exploration equipment used in the present invention

2 is a flow chart of preparation of the exploration equipment according to the present invention

Figure 3 is a flow chart of the use of exploration equipment according to the present invention

4 is a position when exploration of the exploration equipment

5 is a position view of the exploration equipment related

<Explanation of symbols for main parts of drawing>

1.Transmitter 7.Exploration angle

2. Path receiver 8. Path antenna angle

3. Exploration receiver 9. Promoter container and promote sponge

4.Path guide coupler 10.Earth leakage rod

5.Lead wire 9 red / black) 11.Transport

6.Exploration frame 12.Adapter

Hereinafter, described in detail by the accompanying drawings as follows.

FIG. 2 is a schematic diagram of an earth leakage detector, and a gel cell type of rechargeable battery is built in the transmitter to generate power by itself. The receiver fixes both probes of the surveyed probe to the ground for good contact and reflects the movement and direction of the pulse at the point to the receiver meter, inducing access to the leakage point in the tilting direction of the guide, and capturing it. Tell whether or not. Looking at the earth leakage point exploration work of underground buried earth leakage line that proceeds through this process is the same as described in items 1 through 6 above.

Paragraph 1 The exploration work is carried out at one end of the earth leakage line as shown in Fig. 5. During work, the power supply and load shall be disconnected from the earth leakage.

With the transmitter switched off, connect the clip of the black lead wire of the transmitter to the earth leakage receiver and screw it firmly to the ground for good contact.

With the transmitter turned off, mount the receiver on the probe base and connect the two self-lead leads of the probe to the two jacks on the receiver in the same color. Do not touch the leads, clips or wires of the transmitter while the transmitter is powered on.

Section 4 Switch on the transmitter and turn it on. A few seconds after the switch is turned on, pulses are generated every few seconds, accompanied by a beep.

Clause 5 Move the probe to match the path of the earth leakage line as shown in Figs. At this time, the two probes of the survey frame should have good and reliable contact with the ground. The probe should be moved forward with the red side of the receiver in the forward direction and carefully watch for signal strength or decline.

Clause 6 As shown in Figure 4, observe the reverse phenomena of the receiver metric system.If the needle is tilted in the direction of the black jack, move the probe back gradually gradually toward the red jack until the instruction meter indicates "0". . At this time, the width of the left and right movements of the probe will be narrowed to minimize the amplitude of the needle, eventually reaching "0" point, and the center of the probe when the needle is stopped will be marked on the ground.

Clause 7 Indicate the stop point by moving the survey frame at right angle or 90 degree rotation direction as shown in <Figure 4> from the point indicated in <paragraph 6>, and then displaying the intersection with the stop point of <Figure 5>. This is the point of leakage.

When the earth leakage line is in concrete or asphalt, the accelerator (salt water) from the accelerator container is soaked in the sponges of both probes to activate the leakage leakage.

As described above, the present invention forms a circuit by connecting a ground fault line consisting of a transmitter, a receiver, a survey frame, and a ground fault receiving rod to a ground fault line, thereby capturing an accurate ground fault point through the movement of a pulse generated from the transmitter. Findings can lead to the derivation of reasonable measures of subsequent relevant follow-up work and the discovery of new designs. In particular, the accuracy and speed of pre- and follow-up measures can contribute to the excellent adaptability and stability in the field, and to contribute to the prevention of safety accidents caused by short-circuit cables in rainy or flooded areas.

Claims (3)

Earth leakage detectors and their associated transmitters (transmitters), receivers (receivers), probes, earth leakage receivers, accelerator containers. Exploration Method for Detecting Earth Leakage Lines Promoting solution distribution pipes and sponges leading to probes and probes attached to the probe frame.