JP2000284015A - Method for detection ground-fault location trolley line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for detecting a ground-fault location in a trolley line capable of easily detection a ground-fault location in a trolley line in a short time. SOLUTION: A high-frequency current transmitter 10 to pass a high-frequency current through a trolley line is connected between a trolley line 8 in the vicinity of a power supply device 6 and the ground. At the time when a ground fault occurs in the trolley line 8, the high-frequency current transmitter 10 is activated. Then a magnetic detector 12 is brought close to the trolley line 8 and moved along the trolley line 8 to detect a interface between a location at which a magnetic field M occurs in the trolley line 8 and a location at which a magnetic field M does not occur by a magnetic detector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trolley wire ground fault detecting method.

[0002]

2. Description of the Related Art In a steel mill, for example, an electric drive vehicle is used as a transport vehicle for transporting coke from the outdoors to a coke factory, a coil transport cart in a metal strip manufacturing factory, and the like. A trolley wire is provided as power supply means. The trolley wire has a trolley wire installed at a high position along a traveling rail of an electric vehicle and is suspended from the trolley wire.

The trolley wire is often locally grounded under the influence of wind, rain, dust, moisture, high heat and the like. For example, a ground fault may occur due to deterioration or burning of the insulating cover of the trolley wire, and a ground fault may occur at a location where conductive dust is deposited on the trolley wire. If the trolley wire is grounded for some reason like this,
A ground fault location was detected by measuring the insulation resistance value of the trolley wire for each section of a predetermined length. In addition, a visual fault diagnosis of a worker or the like also detects a ground fault location due to accumulation of inductive dust or burning.

[0004]

However, since the trolley wire is erected with a length of several hundred meters, if insulation resistance is measured for each predetermined length section, it takes a lot of time until a ground fault is detected. Needs time. In addition, since the visual diagnosis of the trolley wire must be performed by an operator at a high position, there is a problem in terms of work safety and labor. Therefore, the current situation is that the equipment downtime until the trolley wire in which the ground fault has occurred is returned to normal is prolonged.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a trolley wire ground fault location detection method that can easily detect a short-circuit location of a trolley wire in a short time. I have.

[0006]

In order to solve the above-mentioned problems, the present invention provides a method for detecting a ground fault location when a trolley wire for supplying electric power from a power supply device to an electric drive mechanism is grounded. A high-frequency current transmitter that supplies a high-frequency current to the trolley line is connected between the trolley line and the ground near the power supply device, and the high-frequency current is transmitted when the trolley line is grounded. Activate the transmitter, and then move the magnetic field detector close to the trolley wire and move along the trolley wire, and the magnetic field detector generates a place where the magnetic field of the trolley wire is generated and a magnetic field is generated. This is a method of detecting the boundary of a part that does not exist.

According to the present invention, when the high-frequency current transmitter is operated when the trolley wire is grounded, the high-frequency current flows to the short-circuited portion of the trolley wire, and then returns to the high-frequency current transmitter through the ground from the short-circuited portion. A loop is formed, and the trolley wire generates a magnetic field from the position where the high-frequency current transmitter is connected to the ground fault. Then, as the magnetic field detector is moved along the trolley line, it is necessary to confirm the boundary position between the place where the magnetic field is generated and the place where the magnetic field is not generated, and detect this boundary position as the ground fault location. Becomes possible.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of an electric vehicle 4 traveling on a traveling rail 2. The electric driving vehicle 4 is installed at a high position along the traveling rail 2, and a trolley wire 8 is suspended from an overhead wire (not shown). Has been
Its end is connected to the power supply device 6.

[0009] The driving power supplied from the power supply device 6 to the electric utility vehicle 4 via the trolley wire 8 is returned to the power supply device 6 again via the traveling wheel 2 serving as a return line. Here, the trolley wire 8 near the power supply device 6
A high-frequency current transmitter 10 is connected between the trolley wire 8 and the ground, and the high-frequency current transmitter 10 is a device for flowing a high-frequency current of about 500 Hz to the trolley wire 8.

FIG. 2 shows a method of detecting a ground fault when the trolley wire 8 is grounded. In this case, the magnetic field detector 12 is connected together with the high-frequency current transmitter 10 described above. use. That is, when the high-frequency current transmitter 10 is operated when the trolley wire 8 is grounded, a current loop returning to the high-frequency current transmitter 10 through the underground 14 from the short-circuit location after the high-frequency current flows to the short-circuit location of the trolley wire 8. To form At this time, the trolley wire 8 generates a magnetic field M from the position where the high-frequency current transmitter 10 is connected to the ground fault.

Next, the maintenance worker moves the magnetic field detector 12 close to the trolley wire 8 along the trolley wire 8 to detect a portion where the magnetic field M is generated and a portion where the magnetic field M is not generated. I will do it. That is, in FIG. 2, when the magnetic field detector 12 is moved from the high-frequency current transmitter 10 side, the generation of the magnetic field M is continuously confirmed in the first stage.
Then, when the magnetic field detector 12 further moves rightward from the ground fault location in FIG. 2, the magnetic field detector 12 does not confirm the generation of the magnetic field M. Thereby, the ground fault position can be detected. On this occasion,
The maintenance worker fixes the magnetic field detector 12 on the tip of the long rod, and connects the magnetic field detector 12 on the tip of the long rod to the trolley wire 8.
Walk along the traveling rail 2 while approaching the work.

As described above, in the present embodiment, when a ground fault occurs in the trolley wire 8, a high-frequency current flows through the trolley wire 8 from the high-frequency current transmitter 10 arranged on the power supply device 6 side, and the magnetic field detector 12 And the magnetic field M on the trolley wire 8
The ground fault location can be detected by confirming the boundary position between the location where the magnetic field M is not generated and the location where the magnetic field M is generated.

Conventionally, it took about 2 hours to measure the insulation resistance for each predetermined length section. However, when the work of the present embodiment is performed, it is possible to detect the ground fault location of the trolley wire 8 in about 30 minutes. And the time required to detect a ground fault can be greatly reduced. Further, since the ground fault location is detected only by moving the magnetic field detector 12 along the trolley wire 8 while approaching the trolley wire 8, the workability is improved and the labor can be saved. Therefore, it is possible to reduce equipment downtime until the trolley wire in which the ground fault has occurred is restored to normal.

In the present embodiment, one magnetic field detector 12 is moved from the high-frequency current transmitter 10 side to check for the presence of the magnetic field M.
Are arranged at predetermined intervals of the trolley wire 8 and the presence or absence of the magnetic field M is simultaneously checked using the magnetic field detectors 12, so that the time required to detect a ground fault can be further reduced.

[0015]

As described above, according to the trolley wire ground fault detecting method of the present invention, when a ground fault occurs in the trolley wire, the high-frequency current transmitter arranged on the power supply device side transmits the high-frequency current to the trolley wire. A ground fault can be detected simply by passing a current and using a magnetic field detector to check the boundary position between the location where a magnetic field is generated on the trolley wire and the location where no magnetic field is generated. Compared with this, the detection time of the ground fault location can be significantly reduced.

In the present invention, the ground fault is detected only by moving the magnetic field detector along the trolley wire while approaching the trolley wire, so that workability is improved and labor saving is achieved. Can be. Therefore, it is possible to reduce equipment downtime until the trolley wire in which the ground fault has occurred is restored to normal.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a system for supplying electric power from a power supply device to an electrically driven vehicle via a trolley wire.

FIG. 2 is a diagram specifically showing a method of detecting a short-circuited portion when a trolley wire is short-circuited.

[Explanation of symbols]

 Reference Signs List 4 electric drive vehicle (electric drive mechanism) 6 power supply device 8 trolley wire 10 high-frequency current transmitter 12 magnetic field detector 14 underground M magnetic field

Claims (1)

[Claims] 1. A method for detecting a ground fault location when a trolley wire for supplying electric power from a power supply device to an electric drive mechanism has a ground fault, the method comprising: detecting a location between the trolley wire near the power supply device and the ground. A high-frequency current transmitter that supplies a high-frequency current to the trolley wire, and activates the high-frequency current transmitter when the trolley wire is grounded; then, a magnetic field detector is connected to the trolley wire. A trolley, which moves along the trolley wire so as to approach the trolley wire, and detects a boundary between a place where a magnetic field of the trolley wire is generated and a place where no magnetic field is generated by the magnetic field detector. Ground fault detection method of the line.