JPH03214077A - Detection device for ground faults, etc. on overhead power transmission lines - Google Patents

Abstract

PURPOSE:To achieve a highly accurate detection without damaging a main line by a method wherein a current transformer is mounted on a conducting connecting member of a pipe jumper member and an output of the current transformer is emitted as radio wave to receive it with a receiver mounted on a steel tower. CONSTITUTION:The same voltage the same in phase flows through aluminum pipes 10 composing pipe jumper members 9. But a weak current shunts to an aluminum spacer 11 connecting the pipes 10 depending on a difference of inductance between a conductor near a steel tower 5 or the like and the jumper members 9. When a ground fault occurs in a main power transmission line 1, an excessive fault current shunts to the spacer 11. The shunt current is detected as secondary output of a current transformer 14 mounted in the perimeter of the spacer 11 and amplified and modulated with a transmitter 15 to be radiated to a receiver 22 as radio wave. The receiver 22 mounted on an arm 6 of the steel tower 5 receives this radio wave to be amplified and modulated and then, it is transmitted to a monitoring station (substation). At the monitoring station, a fault is determined when the radio wave detected exceeds a fixed reference value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting ground faults, etc. in overhead power transmission lines.

[Conventional technology]

Conventional devices for detecting ground faults, flash faults, etc. on overhead power transmission lines either attach detection sensors such as optical sensors or current transformers to overhead power lines, insulator horns, steel towers, etc., or directly connect them to the transmission main line. The method used was to attach a detection sensor.

[Problem to be solved by the invention]

However, since ground faults and the like occur on the main line itself, the method of installing detection sensors on parts other than the main line, such as on steel towers, has the disadvantage of low detection accuracy because it indirectly detects the fault current. be.

In addition, the method of attaching the detection sensor directly to the main line has high detection accuracy because it can directly detect the fault current, but when the main line swings due to wind etc., the detection sensor may rub against the main line or cause a collision. This is not desirable as it may damage the main line.

Therefore, it is a technical object of the present invention to provide a detection device that has high detection accuracy and does not cause damage to the main line.

[Means to solve the problem]

In order to solve the above problems, the present invention constitutes a pipe jumper member by interconnecting a plurality of aluminum pipes corresponding to each conductor of a multi-conductor electric wire with a conductive connecting member, and the jumper member is In a jumper device for an overhead power transmission line connected between jumper wires, a current transformer is attached to the conductive connecting member of the pipe jumper member, and a transmitting device that amplifies and modulates the output of the current transformer and emits it as a radio wave is installed in the pipe. The structure is such that the jumper member is attached to an appropriate position, and the radio wave receiving device is attached to a part of the steel tower near the pipe jumper member.

[Function] Currents of the same phase and voltage flow through each pipe member constituting the pipe jumper member, but due to the difference in inductance between the conductor near the steel tower and the pipe jumper member, a weak IF is applied to the connecting member of the pipe members. The flow splits.

When a ground fault occurs on the main power transmission line, an excessive fault current is shunted to the connecting member between the aluminum pipes on the faulty line and the aluminum pipes on the non-faulty line.

The shunt current flowing through the connecting member is detected as the secondary output of the f-current device. The secondary output is amplified and modulated in the transmitter and radiated as radio waves toward the receiver.

When the receiving device receives the above radio waves, it amplifies and modulates the radio waves and transmits them to a monitoring station such as a substation. At the observation post,
An accident is determined if the detected current exceeds a certain reference value.

〔Example〕

The jumper device shown in FIG. 1 shows an example in which high voltage for one phase is transmitted using two transmission lines.

A main line 1 of the power transmission line is supported by an arm 6 of a steel tower 5 via a detention clamp 2, a yoke fitting 3, and an insulator 4.

One end of the jumper wire 7 is connected to the retaining clamp 2, and the other end of the jumper wire 7 is connected to the pipe jumper member 9.

In the illustrated case, the pipe jumper member S is made by connecting two aluminum pipes 10 with an aluminum spacer 11 at a required distance. This pipe jumper member 9
is suspended from the yoke fitting 3 via hanging fittings 12 which are bendably connected to the respective spacers 11 at both ends. Also, a current transformer 14 is placed around the spacer 11 in the center.
is installed. Further, a transmitting device consisting of a transmitter 15, an antenna 16, a solar cell 17, and a storage battery 18 is attached to an appropriate position on the pipe jumper member 9.

The transmitter 15 includes an amplifier circuit and a modulation circuit, and is adapted to radiate radio waves from an antenna 16 in an appropriate radio wave format. Electric power necessary for the operation of the transmitter 15 is supplied from the solar cell 17, and at night and the like from the storage battery 18 (see FIG. 2).

On the other hand, the arm 6 of the steel tower 5 has an antenna 21 and a receiver 2.
2. A receiving device consisting of an electro-optical converter 23, a solar cell 24 and a storage battery 25 is attached.

The receiver 22 includes an amplification circuit and a demodulation circuit, and its output is sent to an electro-optical converter 23, where it is converted into an optical signal. The optical signal is transmitted to the substation by an optical cable ground wire (OPGW). Further, the power necessary for operating the receiver 22 and the converter 23 is supplied from the solar cell 24 or the storage battery 25 as described above.

Note that the power on the receiving side does not necessarily have to come from the solar cell 17 or the storage battery 18, and the output of the current transformer 14 can also be used. In addition to the means of attaching the current transformer 14 to the spacer 11, it is also possible to pass another conductor between the ends of each aluminum vibrator 10 and attach the current transformer 14 to that conductor.

The device of the embodiment is as described above, and normally there is a slight difference in inductance between both aluminum vibes 10 and the steel tower 5 due to the difference in distance, so a minute current flows through the spacer 11 and is detected by the current transformation 814. be done. This current is sent to the substation via the transmitting device, the receiving device, and the opcw, but if the current is below a certain level, it is not determined that there is an accident.

When an excessive current flows in one power transmission line main line 1 due to an accident, a large current flows in the spacer 11 between each aluminum pipe 10 belonging to the accident line and the non-accident line. For this reason, the signal transmitted to the substation also becomes larger than a certain level, so it is determined that an accident has occurred.

〔Effect of the invention〕

As described above, since this invention is a jumper device in which a current transformer is attached to an external connecting member such as an aluminum pipe spacer, it is possible to directly detect a shunt current of a fault current flowing in a main line. , detection accuracy can be increased.

In addition, current transformers are not attached directly to the main line or aluminum pipes, but to spacers, etc. that connect aluminum pipes, so the jumper device swings and the current transformer moves. Even if something happens, there is no risk of damaging the main line or the aluminum pipe itself.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the embodiment, and FIG. 2 is a block diagram showing a part of the same. 1... Main line, 2... Detention clamp, 3... Yoke fitting, 4...
Insulator, 5... Steel tower, 6... Arm, 7... Jumper wire, 9... Pipe jumper member, 10... Aluminum pipe, 11...Spacer, 12...River/hanging fittings, 14...Current transformer, 15...Mountain/transmitter, 16...Antenna, 17...・・Big VA! Pond, 18...Storage battery, 21...
antenna, 22...Receiver, 23...Mountain/electro-optic converter, 24...Solar cell, 25.
・Song storage battery.

Claims (1)

[Claims] (1) Overhead power transmission line in which a pipe jumper member is constructed by interconnecting a plurality of aluminum pipes corresponding to each conductor of a multi-conductor electric wire with a conductive connecting member, and the jumper member is connected between the jumper wires. In the jumper device, a current transformer is attached to the conductive connecting member of the pipe jumper member, and a transmitting device that amplifies and modulates the output of the current transformer and emits it as a radio wave is attached to an appropriate position of the pipe jumper member. A device for detecting ground faults, etc. in an overhead power transmission line, characterized in that the radio wave receiving device described above is attached to a part of a steel tower near a jumper member.