JPH0259678A - Detecting instrument for earth short-circuit of power transmission and supply tracks - Google Patents

Abstract

PURPOSE:To enable to easily exchange and to surely discriminate fault iron tower by equipping a current transformer so that it surrounds a fixing metal tool at the root of an insulator device fixing point to an arm of the iron tower. CONSTITUTION:Plural arms 2 are equipped horizontally with an iron tower 1, a fixing metal tool 3 is wrung and fixed to respective arm thereof by a bolt 4 and double nut 5. A coupling metal tool 7 of the equipping side is formed of this fixing metal tool 3 and an U clevis 6 supported thereof. Next, a fixing plate 20 is fixed to the double nut 5, a current transformer 21 is equipped so that it surrounds the coupling metal tool 7 with this tip part. And, a lead wire 26 being inducted from this is connected with a display equipment 27 provided in the lower part of the iron tower 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an apparatus for detecting ground faults in power transmission and distribution lines.

[Prior Art] Generally, in a suspended insulator device for a power transmission line, one end of the insulator chain is fixed to an arm of a steel tower, and the power transmission line is supported at the other end of the insulator chain. When a lightning surge current occurs in the power transmission line, the i
A flash circuit occurs between the arc horns installed at both ends of the seven-strand chain, and the fault current flows to the arm of the tower, and is discharged from the tower to the ground.

The first conventional ground fault current detection device was the Ichitoku Koko Sho 62-5
As shown in Japanese Patent No. 5375, there is a system in which a fault current flowing through the main body of a steel tower is detected by two current transformers (CT) attached to the tower and a detection circuit.

In addition, as a second ground fault 'rh flow detection device,
As shown in Japanese Patent No. 6-89063, there is also a detection device that identifies an accidental steel tower based on the lightning surge current flowing through the tower.

Furthermore, as a third ground fault fault current detection device,
As shown in Publication No. 7-164495, a spherical display part is attached to the arc horn on the power supply side, and when a ground fault current flows through this display part, the display part falls off and displays the flash fault location. something is proposed.

[Problems to be Solved by the Invention] However, the first ground fault current detection device has a problem in that the fault current is also shunted to the neighboring tower via the ground wire at the top of the tower, so in order to identify the faulty tower, It was necessary to install two current transformers and a detection circuit at the tower base.

In addition, in the second ground fault current detection device using lightning surge current, since the lightning surge current is shunted, devices attached to the accidental tower 1 are also activated, making it difficult to identify the accidental tower. was there.

Furthermore, the third earth fault current detection device has an indicator that falls off due to an earth fault accident, making it impossible to use it repeatedly and requiring a new indicator to be replaced, which is extremely troublesome. There was a problem that.

SUMMARY OF THE INVENTION An object of the present invention is to provide a ground fault current detection device for electrical lines that can reliably identify an accidental tower and can be used repeatedly.

[Means for Solving the Problems] In order to achieve the above object, the invention as claimed in claim 1 provides a method for attaching a grate device to an arm of a power transmission and distribution line tower so as to surround a mounting bracket at the base of a point. A method is adopted in which a current transformer for fault current detection is inserted and a lead wire led out from the current transformer is connected to a display device.

Further, the invention according to claim 2 is the invention according to claim 1, in which the current transformer is formed into two parts.

According to a third aspect of the present invention, in the electric line ground fault current detection device according to the first aspect, a storage portion for housing a current transformer is integrally formed in the mounting bracket.

The invention according to claim 4 is the ground fault current detection device for electric lines according to claim 1, wherein an electric-optical converter for converting electrical No. 18 into an optical signal is connected to the current transformer. We are taking steps to do so.

According to a fifth aspect of the invention, in the electric line ground fault current detection device according to the first aspect, a space is provided in a part of the current transformer.

[1 yen: for] The invention as claimed in claim 1 is a system in which a lightning strike on a power transmission line causes a flash fault between the arc horns, and the fault current flows to the arm of the tower via the horn mounting bracket on the ground side and the connecting bracket on the ground side. . At this time, the fault current induces a voltage in the coil of the current transformer installed around the grounding side mounting bracket, and a current based on this voltage is supplied to the display device via the lead wire.
The phase where a ground fault occurred is reliably displayed. In addition, the fault current caused by a lightning surge or the like that flows from the accidental tower to the normal tower via the ground wire is shunted through the main body of the tower, but this prevents the display device from malfunctioning and improves the six-sidedness.

Further, the invention as set forth in claim 2 can be easily attached to an existing power transmission line fishing rod device, and also facilitates replacement work when a current transformer breaks down.

According to the third aspect of the present invention, the installation space can be significantly reduced, the number of parts can be reduced, and the work of installing the current transformer can be omitted.

The invention according to claim 4 converts the current detected by the current transformer into an optical signal using an electric-optical converter, and transmits the optical signal to the display device through the optical fiber, so that electromagnetic induction to the transmission line, Malfunctions of the display device due to electrostatic induction can be prevented.

According to the fifth aspect of the present invention, by providing a space in a part of the current transformer, the current transformer can be mounted on the mounting bracket without being divided into two parts, and its replacement work can be facilitated.

[Example] Hereinafter, a first example of repair that embodies the invention claimed in claim 1 will be described.
This will be explained based on FIGS.

As shown in FIG. 11, a plurality of arms 2 are installed horizontally on the steel tower l, and each arm 2 has, as shown in FIG.
A mounting bracket 3 is tightened and fixed by a bolt 4 and a double nut 5, and a U clevis 6 is supported on the mounting bracket 3 so as to be swingable in the track direction and the orthogonal direction. This U clevis 6 and the mounting fitting 3 constitute a connecting fitting 7 on the ground side in this embodiment.

A center portion of a horn mounting bracket 8 on the ground side is connected to the lower end of the U clevis 6 by a pole 1-9 so as to be rotatable in the track direction. Ground side arc pawns 10 are attached to both left and right sides of the horn mounting bracket 8, respectively. At the lower center of the pawn mounting bracket 8, a hanging date 1 is attached.
A cap fitting 13 of a suspended insulator 11 located at the upper end of a suspended insulator chain device 12 in which a large number of suspended insulators 1 are connected in an r arrangement is connected to a cap fitting 13 of a suspended insulator 11 so as to be rotatable in the track direction.

The above-mentioned hanging eiko tsusou y! At the lower end of 112, there is a connecting fitting 1.
5 are connected to each other, and a power-side horn mounting bracket 16 is supported at the lower end of the connecting bracket 15, and charge-side arc horns 17 are provided on both left and right sides of the mounting bracket 16.

A wire clamp 18 is provided at the center of the horn mounting bracket 16.
is attached, and a power transmission line 19 is supported by the clamp.

As shown in FIGS. 1 and 2, a mounting plate 20 is fixed to the mounting bolts 4 and double nuts 5 of the mounting bracket 3 so as to be sandwiched between both nuts 5. A current transformer 21 is attached to the section so as to surround the full-ground connecting fitting 7. This current transformer 21 is composed of an iron core 22, a coil 23 wound around the iron core, and an insulating jacket 24 molded on the outside of these, and a mounting bracket erected on the insulating jacket 24. 24
The upper end of a is fastened to the mounting plate 2o by bolts 25. The lead wire 26 led out from the coil 23 is guided downward from the main body of the tower 1 via the support arm 2, and is connected to a display device 27 provided at the bottom of the tower 1 as shown in FIG. There is.

As shown in FIG. 3, the current transformer 21 is mounted so that the horn mounting bracket 8 will not collide even if the suspension insulator chain device 12 swings horizontally.

As shown in FIG. 4, a total of six suspended insulators 12 are supported on a three-phase two-line steel tower, and each suspended insulator 12
The current transformers 21 are mounted in correspondence with the upper ground-side connecting fittings 7, and each lead wire 26 led out from each current transformer 21 is led to the display device 27, respectively. This display device 27 only needs to be installed at one location as long as it can identify the tower where the accident occurred, but if it is necessary to be able to identify the phase where the ground fault occurred, it may be necessary to install it at each tower. A display device 27 is provided corresponding to each current transformer 321 .

Next, the operation of the power transmission line ground fault current detection device configured as described above will be explained with reference to FIGS. 1 and 4.

Now, when a lightning surge enters the power transmission line 19, the fault current flashes from the wire clamp 18, the horn mounting bracket 16, and the charging side arc horn 17 to the grounding side arc horn 10, and then the grounding side horn It flows through the mounting bracket 8, the U clevis 6 and the mounting bracket 3 to the support arm 2, and further flows to the steel tower 1.
electricity is discharged into the earth. Said U clevis 6 and mounting bracket 3
Since the fault current flowing through the current transformer 21 acts on the current transformer 21, a voltage is induced in the coil 23 of the current transformer 821, and as a result, current is supplied from the lead wire 26 to the display device 27, causing a ground fault. The steel tower is determined by the display operation of the display device 27.

Moreover, the fault current is transmitted from the faulty tower to the ground wire GW.
Although the flow is also diverted to a normal steel tower via , it does not flow through the Hiko mounting bracket 3 in a normal steel tower.

Therefore, the display device 27 will not malfunction due to this shunt current, and the tower where the ground fault has occurred can be reliably confirmed.

Moreover, since the current transformer 21 does not need to be replaced even if a ground fault occurs repeatedly, maintenance becomes easy.

FIG. 5 shows an embodiment of the invention as claimed in claim 2.

In this embodiment, the current transformer 21 is divided into two parts so that it can be easily attached to the connecting fitting 7 on the ground side of an existing steel tower. To explain this embodiment in detail, bearings 33 and 34 are protruded from the outer peripheral surface of one end of the semicircular current transformer element 31 and 32 so as to be overlapped with each other, and are connected to each other by a shaft 35 so as to be able to close. ing.

Also, a locking hole 36a is provided on the outer surface of the other end of the element 31.32.
A locking lever 37 is rotatably supported by a shaft 38 on the outer peripheral surface of the other element 32 in correspondence with the locking member 36, and is always supported outwardly by a spring 39. is being energized. When joining the elements 31, 32 to each other, the locking pawl 37a of the locking lever 37 enters and locks in the locking hole 36a, thereby connecting and fixing the elements 31, 32 to each other. This element 31.
A seal link 40 is provided on the joint end surface of 32.

FIG. 6 shows an embodiment of the invention according to claim 3.

This detection device has an iron core storage part 4- which is integrated with the mounting bracket 3.
1 is provided, the iron core 22 of the current transformer 21 is housed in the housing part 41, and the upper part of the housing part 41 is filled with an insulating organic substance 42. Further, the installation space for the current transformer 21 can be significantly saved, and the installation work is facilitated.

7 and 8 show an embodiment of the invention according to claim 4. FIG.

This detection device houses the electro-optical converter 43, which is constructed of the electric circuit shown in FIG. The optical signal No. 18 is transmitted to the display device 27. In addition, in Fig. 8, 45 is a surge absorber, 1゛D is a Zener diode for outputting a specified voltage, R1 and R2 are load resistances for the coil, and D1 to
．． D4 is a diode that constitutes a DC bridge circuit.

In this embodiment, the power 81 to the transmission line to the display device 27 is
Malfunction of the display device @27 due to induction or electrostatic induction can be prevented.

FIG. 9 shows an embodiment according to claim 5. This detection device has a space provided in a part of the current transformer 21 so that it can be easily attached to the connecting fitting 7 on the ground side of an existing steel tower. .

Note that the present invention can also be embodied as follows.

In the above-mentioned embodiment, a suspension type power transmission line one-frame device was specifically constructed (B).
Among them, this should be realized in a tension-resistant power transmission line support insulator device.

Effects of the L invention] As described in detail above, the invention according to claim 1 has the effect that it is possible to reliably identify the steel tower where the ground fault has occurred.

In addition to the effects of the invention described in claim 1, the invention described in claim 2 has the advantage that it can be easily applied to a support insulator device for an existing steel tower.

In addition to the effect of the invention as claimed in claim 1, the invention as claimed in claim 3 has the advantage that the installation space for the current transformer and the work required for its installation can be saved.

In addition to the effect of the invention as claimed in claim 1, the invention as claimed in claim 4 has the advantage of improving the power of the transmission line. This has the effect that shielding measures can be omitted.

The invention set forth in claim 5 has, in addition to the effect of the invention set forth in claim 1, a space provided in a part of the current transformer so that the current transformer can be mounted on the mounting bracket without being divided into two parts. There is an advantage that the replacement work can be easily performed.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a ground fault current detection device for a power transmission line embodying the invention as claimed in claim 1; Fig. 2 is an enlarged perspective view showing the state of installation of a current transformer; A front view showing a state in which the support i7 child device is swung in the track direction, FIG. 4 is a perspective view of the road body without showing the entire ground fault current detection device, and FIG. 5 is a perspective view of the road body, and FIG.
FIG. 6 is an exploded perspective view of essential parts showing an embodiment of the invention as claimed in claim 3; FIG.
The figure is a cross-sectional view of essential parts showing an embodiment of the invention according to claim 4,
FIG. 8 is an electric circuit diagram, and FIG. 9 is a perspective view showing an embodiment of the invention according to claim 5. 1... Steel tower, 2... Arm, 3... Mounting bracket, fittings,
4゜25...Bolt, 5...Double nut, 6...
・U clevis, 7... Connection fitting on the grounding side, 8... Horn mounting bracket on the grounding side, 10... Arc horn on the grounding side, 12... Suspended child connection, 16... Voltage charging Horn mounting bracket on the side, 17... Arc horn on the charging side, 18...
・Wire clamp 1. 19...Power transmission line, 20...Mounting plate, 21...Current transformer, 22...Iron core, 23...Coil, 24...Insulation jacket, 24a・··bracket,
26...Lead wire, 27...Display device, 31.32
...Semicircular element, 3538...Axis, 36...
Locking member, 36a... Locking hole, 37... Locking lever, 37a... Locking claw, 39... Spring, 40... Seal ring, 41... Iron core storage section, 43...Electricity-
Optical converter, 44... Optical fiber cable, 45...
・Sensor case. Patent Applicant: 60 children of Japan, Co., Ltd. Agent, Patent Attorney On 1) Hironobu / / / ~ 12 / Figure 6 Figure 8 No drawings after Figure 9 Written amendment of voluntary procedure 1. 1986 Patent Application No. 211318 2 Name of the invention Earth fault current detection device for power transmission and distribution lines 3 Person making the amendment Relationship to the case: Patent applicant address 2-56 Suda-cho, Mizuho-ku, Nagoya City First name
406 Nippon Insulator Co., Ltd. (Name) Representative Toshito Ohara Address 1, Kamikobari, Inuyama City, Aichi Prefecture Name Energy Support Co., Ltd. (Name) Representative Shigetsugu Takaoka 4, Agent Address 500 Hatazume, Okigifu City Town 2 0582 (65)-1810 (Representative) 5, Subject of amendment (1) Defining the scope of claims in the specification (2) Detailed explanation of the invention in the specification column 6, Contents of amendment (1) The description of persimmon in the claims of the specification is amended as shown in the attached sheet. (2) The following statement is inserted between lines 11 and 12 on page 5 of the specification. "The invention as set forth in claim 6 provides the ground fault current detection device for electric lines as set forth in claim 1, in which the lead wires are bundled into three phases and connected to a display device." (3) Same as above. Insert the following statement between page 6, line 20 and page 7, line 1. ``The invention as claimed in claim 6 is characterized in that the lead wires are grouped into three phases and displayed.
t'ft, the number of display devices can be reduced. (4) The second and third lines of page 7 are amended as follows. [Hereinafter, an embodiment embodying the invention described in claims 1 and 6 will be described based on FIGS. 1 to 4. (5) The following statement should be inserted between lines 7 and 8 on page 14. "The invention as claimed in claim 6 has the effect of reducing the number of display devices in addition to the effect of the invention as claimed in claim 1.""2. Claim ■. A current transformer (21) for ground fault current detection is interposed at the base of the insulator device attachment point to the arm (2) so as to surround the mounting bracket (3), and a lead drawn out from the current transformer @< A ground fault current detection device for a power transmission and distribution line, characterized in that the current transformer (26) is connected to a display device (27).2. ) is formed into two parts. 3. In the ground fault current detection device for a power line according to claim 1, the mounting bracket (3) includes a current transformer ( 21) A ground fault current detection device for a power transmission and distribution line, characterized in that a storage portion (41) for storing the current detection device is integrally formed. 4. In the ground fault current detection device for a power line according to claim 1, the A ground fault current detection device for a power transmission and distribution line, characterized in that an electric-optical converter (43) for converting an electric signal into an optical signal is connected to a current transformer (21). 5.8?l The ground fault current detection device for power transmission and distribution lines according to claim 1, characterized in that a space is provided in a part of the curved current transformer (2).

Claims (5)

[Claims] 1. A current transformer (21) for detecting ground fault current is interposed at the base of the insulator device attachment point to the arm (2) of the power transmission and distribution line tower (1) so as to surround the mounting bracket (3). A ground fault current detection device for a power transmission and distribution line, characterized in that a lead wire (26) led out from a flowmeter is connected to a display device (27). 2. 2. The ground fault current detection device for power transmission and distribution lines according to claim 1, wherein the current transformer (21) is formed into two parts. 3. 2. The power transmission/distribution line ground fault current detection device according to claim 1, wherein the mounting bracket (3) is integrally formed with a storage portion (41) for storing a current transformer (21). Line ground fault current detection device. 4. The earth fault current detection device for electric lines according to claim 1, characterized in that an electric-optical converter (43) for converting an electric signal into an optical signal is connected to the current transformer (21). Ground fault current detection device for power transmission and distribution lines. 5. 2. The ground fault current detection device for power transmission and distribution lines according to claim 1, wherein a space is provided in a part of the current transformer (21).