JPH0347415Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a voltage detection phase detection circuit for a construction switch that is temporarily attached to a utility pole during power outage construction.

[Conventional technology]

When carrying out construction work such as re-stretching electric wires, replacing support insulators, and elevating pole-mounted electrical equipment on high-voltage power distribution lines, electric power companies will carry out work on the above-mentioned construction sections in order to ensure a stable supply of electricity to customers. A temporary bypass line will be installed in parallel with the line. In this case, a construction switch is installed between the utility poles to form the above-mentioned bypass line. Cable phase sequence,
We try to check the charging status, etc. For this reason, the bushing of this type of switch is provided with a terminal for voltage detection and phase detection, and an operator performs inspection work by bringing a voltage detection and phase detection detector into contact with this terminal. This voltage detection phase detection terminal is provided on bushings on the power supply side and load side, and these bushings are arranged on the power supply side and load side of the switch, and are separated by a considerable distance. Therefore, the power source of the voltage detection phase detection terminal and the load are separated from each other. Conventionally, the voltage detection phase detectors were brought into contact with the voltage detection phase detection terminals on the power supply side and the load side at the same time, which are located at separate positions in this manner, to read the attached measuring instruments.

As an example of this type of conventional switch,
There is one as shown in Publication No. 186919. FIGS. 7 and 8 show the overall structure of the switch, with FIG. 7 being a front view showing a state where it is attached to a utility pole, and FIG. 8 being a side view thereof. Reference numeral 1 denotes a construction switch, which is attached to a utility pole 2 by a hanging support fitting 3 fastened to the middle thereof. The support fitting 3 is made up of a support part 5 made of a cross arm, a fastening part 6 made of a chain and a fastening fitting, and a connecting part 7 that connects these two parts and comes into contact with the side of the utility pole. A support bolt 8 is attached to the support portion 5 to suspend and support the switch.

FIG. 9 shows the bushing structure, in which a bushing 15 is attached to the case 14 of the switch so as to penetrate therethrough. The bushing is made of an insulating material such as epoxy resin, and a center conductor 16 is inserted and fixed into the center through hole 15a. Reference numeral 17 denotes a flange fitting fixed to the flange 15c of the bushing, and the bushing is attached to the case by a nut 18. 19 is a packing interposed between the case and the flange metal fitting, 20 is an adhesive, 21 is a packing, 27 is an annular electrode plate provided in close contact with the outer peripheral surface 15g of the middle of the bushing projecting outside the case; The outer periphery is covered with a covering cylinder 28 made of an insulating material. Reference numeral 29 denotes a voltage detection phase detection terminal located below the bushing, and the terminal is inserted through a funnel-shaped insertion guide member 30 made of an insulating material that protrudes and is fixed to the screw portion 30a above the terminal. The terminal is attached by screwing into the covering tube 28, and the tip 29a of the terminal is pressed against the electrode plate 27 to electrically connect the terminal and the electrode plate. In the insertion guide member 30, a rod-shaped detection part 32 provided at the tip of the voltage detection phase detector 31 is attached to the contact part 29b of the terminal 29 when performing voltage detection and phase detection work.
A guide portion 30b is provided below, the lower end of which is flared out to surround the contact portion 29b of the terminal so that the terminal can be guided and contacted. Reference numeral 33 denotes a holding fitting for attaching the covering tube 28. This fitting is inserted from the tip side of the bushing, and the bolt 34 is screwed in from the outside to attach it to the flange fitting 17. The covering tube 28 is attached to both fittings 17. and 33 so that the outer periphery of the electrode plate 27 is covered by the cylinder 28.

[Problem that the invention attempts to solve]

As mentioned above, when the switch is equipped with a bushing equipped with a voltage detection phase detection terminal, the contact area of the terminal is made as small as possible to prevent the terminal from being exposed as much as possible in order to prevent danger. It is difficult to perform inspection work such as inserting and contacting the terminals of the voltage phase detector, and furthermore, it is difficult to read the meter by simultaneously inserting and contacting the terminals on the power supply side and the load side, which are quite far apart. This is difficult, inefficient, and may lead to measurement errors. In addition, although the terminal 29 is surrounded by the guide portion 30b, it becomes an exposed charging portion charged to around 300V, so that there are various drawbacks such as the risk of electric shock in some cases.

[Means for solving problems]

This invention eliminates the above-mentioned drawbacks, and has an electrostatic induction intermediate electrode on the outer periphery of each phase bushing on the power supply side and load side, which is made of an insulator that penetrates the case of the switch and has a center conductor inserted and fixed in the center. The induced voltage signals at the intermediate electrodes of each phase on the power supply side and each phase on the load side are drawn into the operation box attached to the switch, verified by the voltage detector in this operation box, and the results are verified. The present invention is characterized in that the information is displayed on a display installed on the surface of the operation box.

[Effect]

If configured as above, it will be automatically displayed on the display during voltage/phase detection, so there is no need to use a voltage/phase detector, and confirmation can be made by simply looking at the display. .

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5. Identical or corresponding parts in the figures are indicated by the same reference numerals. 4 to 6 show a front view, a side view, and a bottom view of a construction switch equipped with a bushing according to the present invention. In the diagram, 1 is a construction switch,
It is attached to the middle of the utility pole 2 via a pole attachment device 3. The pole mounting device 3 includes a support fitting 4 fixed to the switch 1 and abutting on the utility pole 2, and a fastening device 6 consisting of a chain and a fastening fitting. Reference numeral 5 denotes a hanging fitting for hoisting the switch 1. Reference numeral 10 denotes an operation box that houses a voltage detection phase detector 11 attached to the lower part of the switch 1, and has a voltage detection phase detector 12 and a changeover switch 13 attached to the bottom. SG ₁ to SG ₃ are for phase detection of each phase, and SG ₄ is an indicator for checking the display battery. The changeover switch 13 performs phase detection, power supply check, and switching off.

FIGS. 2 and 3 show a bushing structure according to the present invention, in which a bushing 15 is inserted through the case 14 of the switch. Bushing 15
is made of an insulating material such as epoxy resin, and the central shaft portion 1
A center conductor 16 is inserted through 5a. The external tip of the conductor 16 has a socket part 1 for connecting with the external conductor.
6a, a contact portion 16b is formed at the inner tip portion to connect or contact the inner contact portion. 17
is a flange fitting fixed to the flange 15c of the bushing, and the bushing is attached to the case 14 with a nut or the like. 19 is a packing interposed between the case outer surface 14a and the flange metal fitting 17, and 23 is an O-ring inserted between the burring inner circumferential surface 14b provided at the bushing penetration part of the case 14 and the outer circumferential surface of the bushing 15. . 51 is bushing 15
An intermediate electrode plate 52 in the form of a net or punched plate that surrounds the center conductor and is embedded in the bushing, and 52 is a terminal fitting whose base end is fixed to the electrode plate 51 and whose tip end is exposed from the outer circumferential surface of the bushing. , a partition wall portion 15c surrounding the exposed portion of the terminal fitting 52 on the outer peripheral surface of the bushing.
will be established.

A terminal 53a of the lead wire 53 is attached to the terminal fitting 52.
After connecting by screwing or the like and pulling out the conductor 53 to the outside, the charging exposed portions of the terminal fitting 52, the conductor terminal 53a, etc. are filled with resin 54 in the partition wall 15b and sealed. In this case, the lead wire 53 is an insulated shielded wire. This conducting wire 53 is introduced into the operation box 10 through a protective tube 9 (see FIG. 5) provided along the switch 1, and is connected to the voltage detector 11. The output of the voltage detection phase detector 11 is displayed on the display 12 on the bottom of the operation box 10, and voltage detection phase detection is performed visually, and the power source for display can be easily checked by switching the changeover switch 13. Therefore, voltage detection and phase detection can be carried out safely, reliably, and with simple operations. The indicator 12 is each phase indicator SGi (i=1,
2, 3) and a power supply confirmation indicator SG ₄ .

FIG. 1 is a block diagram of a circuit of a voltage detecting phase detector 11 according to the present invention. The same subscripts in the following symbols indicate corresponding items. In the figure, the induced voltage signal υji (j=1, 2; i=1 ,2,
3) is the input terminal Pji (j=1, 2; i=1, 2, 3) of the voltage detector 11 in the operation box 10. Here, j=1 is the power supply side, j=2 is the load side,
It is assumed that i=1 indicates the R phase, i=2 the S phase, and i=3 the T phase.

From Pji, waveform shaping circuit Zji (j=1, 2; i=1,
2, 3), level detection circuit Lji (j=1,2; i=
1, 2, and 3) respectively. waveform shaping circuit
Zji shapes the received signal into a square wave rather than a sine wave and outputs it, and the level detection circuit outputs when the received signal exceeds a predetermined voltage value that indicates that a normal power supply voltage is supplied. issue. Both outputs of the waveform shaping circuit Zji and the level detection circuit Lji are given to an AND circuit ADji (j=1, 2; i=1, 2, 3), and an AND circuit AD ₁ i, on the power supply side and the load side is applied for each phase.
The output of AD ₂ i is connected to the phase comparator circuit CPi (i=1,
2, 3). Each phase comparison circuit CPi detects a phase shift between the power supply side and load side signals, and outputs an abnormality detection output when the phase shifts by ±50° or more, for example.
The output is given to the alarm circuit AL. phase comparison circuit
Phase abnormality indicators SGi (i=1, 2, 3) are activated by the abnormality detection output of CPi. on the other hand,
The output of the level detection circuit Lji is input to the phase loss detection circuit DP, and if even one element is missing, it is determined that there is a phase loss, an abnormality detection output is output, and the output is given to the alarm circuit AL.
The output of the alarm circuit AL operates the alarm device SP.

The alarm system SP consists of a switch SW, such as a transistor switch, which amplifies power, and an alarm B, such as a buzzer, which is operated by the output of this switch SW.
E is a power supply that provides operating power to the display SGi and alarm device SP, with the positive side E ₁ and the ground side E ₀ .
From the power supply E ₁ , from the common terminal c of the changeover switch 13 to the normally closed terminal b, and as the power supply E ₂ , a phase abnormality indicator
Power the SGi, connect the normally closed terminal a to the power _E3 , and power the power confirmation indicator _SG4 . Changeover switch 1
3 always selects the b terminal, and selects the a terminal only when checking the power supply. The power source E uses, for example, a dry battery, and the indicators SGi and _SG4 use, for example, light emitting diodes. The alarm circuit AL can distinguish the type of alarm between phase abnormality detection and open phase detection, and can identify the content of the abnormality. For example, it is possible to make a continuous sound in the case of phase abnormality detection, an intermittent sound in the case of phase loss detection, or various other methods.

[Effect of idea]

Since the present invention is configured as described above, voltage detection and phase detection can be easily performed using the display, confirmation of the power supply for voltage detection and phase detection can be performed with a simple switch operation, and an alarm can be issued in the event of an abnormality. So safe,
It is possible to perform voltage detection and phase detection reliably and easily.

[Brief explanation of the drawing]

1 to 6 show embodiments of the present invention, FIG. 1 is a block diagram of a voltage detection phase detection circuit, FIGS. 2 and 3 show the bushing structure of the present invention, and FIG. The cutaway front view and FIG. 3 are top views of that part. 4 to 6 show a construction switch equipped with a bushing according to the present invention, in which FIG. 4 is a front view, FIG. 5 is a side view, and FIG. 6 is a bottom view. 7 to 9 show a conventional example, FIG. 7 is a front view of the overall structure of the switch, FIG. 8 is a side view thereof,
FIG. 9 is a cutaway front view showing the bushing structure. 1... Switch, 10... Operation box, 11... Voltage detection phase detector, 12... Voltage detection phase display, 13... Changeover switch, 14... Case, 15... Bushing, 16... Center conductor, 17...flange fitting,
19...Patzkin, 23...O ring, 51...
Electrode plate, 52...Terminal fitting, 53...Outgoing conductor,
υji (j=1,2; i=1,2,3)...Induced voltage, Pji (j=1,2; i=1,2,3)...Input terminal, Zji (j=1,2; i=1,2,3)... Waveform shaping circuit, Lji (j=1,2; i=1,2,3)
...Level detection circuit, ADji (j=1, 2; i=
1, 2, 3)...AND circuit, CPi (i=1, 2,
3)...Phase comparator circuit, SGi (i=1,2,3)
…Phase error indicator, SG ₄ …Open phase indicator, DP
...Power confirmation display, AL...Alarm circuit, SP...
Alarm device, B...Alarm, SW...Switch,
E, E ₁ , E ₂ , E ₃ , E ₀ ... power supply.

Claims (1)

[Claims for Utility Model Registration] An electrostatic induction intermediate electrode is provided on the outer periphery of each phase bushing on the power supply side and load side, which is made of an insulator that penetrates the case 14 of the switch 1 and has the central conductor 16 inserted and fixed in the center. 51 is provided, and the induced voltage signals [υ ₁ i, υ ₂ i (i=1, 2 ,3)]
into the operation box 10 attached to the switch 1,
Verify with the voltage detector 11 in the operation box 10,
A display 1 installed on the surface of the operation box 10 displays the results.
2. A construction switch equipped with a voltage detection phase detector, characterized by displaying the following.