JPS6185011A - Transmitter for detecting ground point - 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 Object of the Invention (Field of Industrial Application) The present invention relates to a transmitting device for detecting a ground fault that is attached to a support pole or the like.

(Prior art) Currently, finding the fault point of a ground fault in an overhead distribution line is
This is done by repeatedly restarting the circuit at the substation and detecting the section where the fault exists using a fault section detection device combined with a sectional switch. In addition, for ground faults that occur due to deterioration of insulators, lightning arresters, etc., the insulation often recovers in a short time and retransmission is successful, making it difficult to find the fault point in such faults. .

(Problems to be Solved by the Invention) As mentioned above, conventionally, it is possible to detect the ground fault fault section, but it takes more time to detect the final ground fault fault point, and it is difficult to detect temporary ground fault faults. In some cases, the ground fault point could not be detected.

Structure of the Invention (Means for Solving Problems) The invention solves the above-mentioned problems, and compared to the conventional directional ground fault point □ detection device, it is easier to detect φ:
9. The purpose is to provide a pair of transmitting devices for detecting ground fault points, which do not have directionality but can function as fault point detection.

The light for detecting a ground fault point of the present invention is detected by a grounding wire that grounds power distribution equipment or a 4.5 support pole, and includes a ground fault current detection section that detects a ground signal, and a ground fault current detection section of the same. It is determined whether or not the detection signal input via
A level judgment circuit that outputs the Nl evil sign and an asterisk attached to the ON signal output from the level judgment circuit and 01-
:) An optical signal circuit that uses a switching circuit that operates to turn on, and a drive current from the switching circuit to send out a specific signal to the fault point, and sends a signal specific to the fault point via the telephone line (RB) to report the ground fault fault point. There are some whose gist is that they are composed of the following.

(For 1') With the above configuration, when a ground fault occurs and the ground fault current detector detects a ground fault current flowing through a grounding wire, etc., the detection level output from the ground fault current detector becomes 1 volt or higher. In this case, an ON signal is output from the level determination circuit to the switching circuit.

Then, when the driving current is output from the switching circuit to the optical signal circuit due to the ON I word, the transmitting circuit operates and transmits a signal unique to the failure point, and the unique signal is reported via the telephone line. (Embodiment) An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 3.゛The grounding wire 1 led out from power distribution equipment such as switches and transformers is connected to each support pillar (not shown).
placed along the

The transmitting device 2 for detecting a ground fault point is attached to a support column so as to surround the ground wire 1 with an attachment band 3 made of a magnetic material such as an iron core.

The ground fault current detection section 4 of the ground fault point detection transmitting device 2 is configured as a simple QQ device by winding the detection coil 5 around the mounting band 3.
-2 is connected to the level determination circuit 6. This level determination circuit 6 determines whether the detection level input at - via the ground fault current detection section 4 has reached a certain level, and outputs a 1jON signal when it is determined that the level is at a certain level. It has become.

A switching circuit 7 is connected to the level determination circuit 6, and operates from O]-1- to ON in response to the ON signal output from the level determination circuit 6, and outputs a drive current. It has become.

The oscillating circuit 8 connected to the switching circuit 7 generates a signal from the device 2 by the drive current from the switching circuit 7.
Each of the supporting columns provided with the supporting column pi=n1 k
'H2, support column P2=n2k l-1z, support +JP
3'='n3' kll/, support column P4= n 4
It is designed to emit a specific unique frequency such as kl-1z. This transmitting circuit 8 is connected to a transmitting device 9 provided on a nearby telephone line,
When a call is started, a call signal is transmitted via the transmitting device 9.

A display circuit 1 also connected to the switching circuit 7
0, this display circuit 10 is a magnetic reversal display device, in which a disk 11 whose both ends are magnetized with Nti and S poles is rotatably supported around a rotation shaft 12, and a round bar-shaped disk 11 is supported rotatably around a rotation shaft 12. The stator 13 is formed to have a magnetic pole part 13a corresponding to the S pole of the disk 11 and a magnetic pole part 13b corresponding to the ON pole of the disk 11.

Note that the stator 13 is preferably formed of a material with low holding force. Connecting terminals (not shown) of the display circuit 10 are provided between the magnetic pole parts 13a and 13b so that the magnetic pole parts 13a and 13b are magnetized with the same polarity as the magnetic poles at both ends of the disk 11 in the state shown in FIG. connected to] Ile 14
is wound.

Markers of different colors (in this embodiment, the front surface 11a is black and the back surface 11b is red) are displayed on the front surface 11a and the helmet surface 111 of the disk 11.

When the output signal from the level determination circuit 6 flows through the coil 14, the magnetic pole portion 13a changes to S as shown in FIG.
The magnetic pole part 13b is magnetized to the north pole, and the disk 11 is reversely rotated so that its N+1 faces the magnetic pole part 13a (south pole) and the S pole faces the magnetic pole part 13b (north pole). A mark attached to the back surface 11b of the disc 11 is displayed externally.

A receiving device that receives the unique signal transmitted from the ground fault detection transmitting device 2 is provided on the power source side of a substation or the like. This receiving device (not shown) is connected to a communication device used in a normal telephone line, and is capable of determining the frequency of a unique signal transmitted via the telephone line.

One use of the ground fault detection transmitter 2 configured as described above will be explained. Now, when a fault occurs at a support pole at a certain point, the ground fault current in the ground wire 1 of the support pole is detected. flows, the ground fault current detection section 4 of the transmitting device 2 outputs a detection signal to the level judgment circuit 6, and this level judgment circuit 6 determines that the detection level input via the ground fault current detection section 4 is constant. Determine whether the level has been reached. When the level determination circuit 6 determines that the level is a certain level, it outputs a ○N signal to the switching circuit 7. The switching circuit 7 operates from OFF to ON based on the ON signal output from the level determination circuit 6, and outputs a drive current to the oscillation circuit 8.

The transmitting circuit 8 uses the drive current from the switching circuit 7 to transmit a signal of a specific natural frequency corresponding to each support column on which the device 2 is installed. When the transmitting circuit 8 starts making a call, it transmits the unique signal via a transmitting device 9 provided on a nearby telephone line.

On the other hand, at this time, the drive current from the level determination circuit 6 also flows to the display circuit 10. When a current flows through the coil 14 of the display circuit 10, the magnetic pole portion 13a becomes S as shown in FIG.
The magnetic pole part 13b is magnetized to the north pole, and the north pole of the disk 11 faces the magnetic pole part 13a (south pole), and the S pole faces the magnetic pole part 13b (north pole). It rotates in reverse like this. As a result, the color mark attached to the blood loss 11b of the disk 1'1 is displayed to the outside to indicate a ground fault.

Then, a receiving device installed on the power supply side of a substation, etc. receives the unique signal transmitted via the communication device of the telephone line, and determines the isoangular frequency of the unique signal. , it is possible to determine in which support column the grounding wire 1 has experienced a ground fault.

Therefore, by notifying the identified ground fault point to the inspection vehicle, the ground fault point can be inspected at an early stage.

In this embodiment, since the display circuit 10 of the ground fault detection device 2 displays a ground fault at the ground fault point, the ground fault point can be easily searched when performing ground fault detection.

Note that this invention is not limited to the above-mentioned embodiments, and can be arbitrarily modified without departing from the spirit of this invention, such as installing the receiving device not only in substations but also in business offices, etc. It is.

Effects of the Invention As detailed above, the present invention does not require a grounding transformer or a zero-phase voltage detection capacitor, and only requires a simple configuration of a ground fault current detection section, a level judgment circuit, a switching circuit, and an oscillation circuit. In addition, since a telephone line is used, the existing configuration for reporting to the power supply side can be used, making it possible to reduce the size, weight, and cost of the entire device. It has an excellent effect of shortening the exploration time and, in turn, has a large effect on early recovery.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of a ground fault detection device according to an embodiment of the present invention, FIG. 2 is a perspective view of a road body showing the normal display state of the display circuit, and FIG. 3 is a ground fault display state. FIG. 1... Grounding wire, 2... Transmitting device for detecting ground fault point, 3...
... Mounting band, 4... Earth fault current detection section, 5... Detection coil, 6... Level judgment circuit, 7... Switching circuit, 8... Transmission circuit, 9... Transmission device, 10
...display circuit, 11...disc, 12...rotation shaft, 13...stator. 14...Coil, L...Telephone line.

Claims (1)

[Scope of Claims] 1. A ground fault current detection section that is installed on a grounding wire or support pole that grounds power distribution equipment and detects ground fault current, and a detection signal that is input via the ground fault current detection section. a level determination circuit that determines whether the level has reached a certain level and outputs an ON signal when it is determined that the level has reached a certain level; A switching circuit that operates, and a transmitting circuit that transmits a signal specific to the fault point using the drive current from the switching circuit, and uses the unique signal to report the ground fault fault point using a telephone line. A transmitting device for detecting a ground fault point, which is characterized by: