KR100660627B1 - The defect indicator for a lightning rod device - Google Patents

Abstract

The present invention is a fault indicator that separates the arrester from the power system by operating a fault indicator when the ground current flows through the time-current characteristic curve in the arrester, and has excellent airtightness and excellent operating characteristics in all current ranges. To provide a fault indicator for an arrester.

That is, the failure indicator 1 for the lightning protection device provided in the present invention has a gap between the lower electrode portion 2 to which the explosive agent 5 is coupled, and the lower electrode portion 2 and the resistor 3. The upper electrode portion 4, which is electrically connected to the circuit, and the lower electrode portion 2 and the upper electrode portion 4 are inserted with insulating casings 7, 18 made of polyacetal and fiberglass having a content of 0 to 30%. It is integrally fixed by injection molding, and the upper and lower insulating casings 7 and 18 are integrally fixed by ultrasonic fusion after assembling the lower electrode part 2, the resistor 3, and the upper electrode part 4, and the resistor 3 One or more resistors 10 having lead wires 11a coupled to the insertion grooves 12 formed in parallel in the transverse direction are formed on the gap-holding insulating molded body 10 made of a polyacetal series. Bar, characterized in that

The present invention provides a failure indicator for an lightning arrester having a perfect airtight structure by integrating the upper and lower electrode parts by the injection molding method using an insulating molding body, by assembling together with the resistor and the gunpowder by the ultrasonic fusion method. When the ground fault current of the system flows through the lightning arrester during prolonged overheating or internal absorption due to long-term overheating or internal moisture absorption, the lightning arrester explodes and scatters, causing damage to property, life and fire. It can be prevented, and it has excellent operating characteristics in the entire current range, and the contact lead of the circuit can be eliminated by making the lead wire of the resistor firmly contact the upper and lower electrodes in the insulating molding body for forming the resistor. The expected effect is a great invention.

Fault indicator for lightning protection device, upper electrode part, lower electrode part, resistor, gunpowder, resistance

Description

The defect indicator for a lightning rod device}

1 is a perspective view of a failure indicator for an arrester provided in the present invention

Figure 2 is an exploded before assembly fixing of the failure indicator for the lightning arrester provided by the present invention

Perspective view

3 is a state in which the assembly of the failure indicator for the lightning arrester provided by the present invention is completed

Section of

■ Explanation of symbols used in main part of drawing ■

1: fault indicator for lightning arrester 2: lower electrode

2a: tapered surface 3: resistor

4: upper electrode portion 4a: tapered surface

5: powder 6: insert groove

7: insulated casing 7a: joint surface

8: jam ring groove 9: knurling part

10: insulation molding 11: resistance

11a: lead wire 12: insertion groove

13: wiring recess 14: through hole

15: discharge portion 16: jam ring groove

17: Knurled part 18: Insulated casing

18a: joint surface

The present invention relates to a failure indicator for a lightning arrester, and more particularly, when the ground fault current flows in the lightning arrestor with a time-current characteristic curve, the failure indicator operates to separate the lightning arrester from the power system. It is an object of the present invention to provide a failure indicator for an lightning arrester that is excellent in operation and has excellent operating characteristics in all current ranges.

Lightning arresters generally have a gap type consisting of characteristic elements limiting the speed, series gaps that block the speed, and an insulator to maintain performance, and oxidation. Using zinc (ZnO) as a device, it is composed of the characteristic element and the love tube using the characteristics of zinc oxide, but it is divided into a gapless type that does not require a series gap.

In the gapless type, a small amount of leakage current flows and the limit current is within 1mA. However, if the element of the arrester deteriorates or moisture penetrates into the arrester housing, the leakage current increases, so that the temperature inside the arrester gradually increases, and accordingly, the leakage current flows more and the temperature inside the arrester increases further. Leads to accidents that are broken.

If the leakage current exceeds a certain value, a device is needed to prevent the accident by separating the arrester from the circuit system. It is the fault indicator for the arrester that performs this function.

In case of a gapless type arrester using zinc oxide as an element, a fault indicator for a lightning arrester is required to protect the arrester. In the past, when a resistor and a gap are used as a means for separating the arrester from the system when excessive leakage current flows. In addition to insufficient measures to protect the resistor from discharge sparks occurring in the gap, it was difficult to accurately maintain the gap. In this case, there was a problem in the reliability of reliably disconnecting the arrester from the system because the rated leakage current could not be properly maintained.

Accordingly, the present invention is to provide a fault indicator for a lightning arrester of a novel configuration that can solve the problems with the fault indicator for the conventional lightning arrester as described above,

In particular, the present invention provides a failure indicator for an lightning arrester for disconnecting the lightning arrester from the power system by operating the fault indicator when the ground current flows in the lightning arrestor having a time-current characteristic curve, but has excellent airtight performance and a high current. The present invention has been completed with the technical problem of the present invention by providing a failure indicator for an lightning arrestor having excellent operating characteristics in the area.

Figure 1 is a perspective view showing a failure indicator (1) for the lightning arrester provided in the present invention, Figure 2 is an exploded perspective view of the assembly before fixing, Figure 3 is a cross-sectional view of the assembly is completed, and the like, as seen with these drawings The invention will be described in detail.

The failure indicator 1 for the lightning arrester according to the present invention has a lower electrode part 2, a resistor 3 which is assembled in the inserted state on the lower electrode part 2, and a lower part of the resistor 3 above. It is composed of the upper electrode portion 4 which is tightly fixed by the ultrasonic fusion process after fitting to the electrode portion (2).

Insertion grooves 6 into which the gunpowder 5 is inserted are formed in the lower electrode portion 2 in the longitudinal direction, and the insulating casing 7 is inserted into the outer side of the lower electrode portion 2 by an injection molding method. It is fixedly installed.

To this end, at least one locking ring groove 8 and an uneven knurled portion 9 are formed at the outer edge of the lower electrode part 2 and the upper and lower sides of the insulating casing 7 by the injection molding method. And it can be firmly fixed to the flow from side to side.

In addition, the resistor 3 allows the resistor 11 to be inserted into the insulating molding body 10 for maintaining the gap, and the insertion groove 12 is transverse in the transverse direction so that arc heat due to a surge or the like is not transmitted to the resistance surface. Two wiring grooves 13 are formed on the upper and lower surfaces so that the lead wires 11a of the resistor 11 can be electrically contacted with the lower electrode portion 2 and the upper electrode portion 4. It is formed and designed so that there is no contact resistance of the circuit, the through hole 14 is formed in the center of the insulating molded body 10 so as to penetrate up and down so that the discharge part 15 of the upper electrode part 4 can be inserted. do.

At least one locking ring groove 16 and an uneven knurled portion 17 are formed at the outer edge of the upper electrode part 4 and the upper and lower sides of the insulating casing 18 by the injection molding method. It can be fixed firmly to prevent flow.

The lower electrode portion 2 and the upper electrode portion 4 are made of copper (Cu) material having high conductivity, and the insulating casings 7 and 18 constituting the outer shell thereof are resistant to insulation, moisture, and water resistance. Polyacetal series is used, and an appropriate amount (about 0-30%) of fiberglass is mixed with polyacetal to withstand the pressure generated in an enclosed space.

And the material of the insulating material for maintaining the gap (10) constituting the resistor (3) uses a polyacetal series, does not contain fiberglass, the heat deformation temperature is high, the hardness is to be adopted to Rockwell 80 or more. .

In addition, the inner diameter of the through hole 14 formed in the center of the insulating molding body 10 for maintaining the gap on the resistor 3 so that the gunpowder 5 does not fall or move in the lower electrode part 2 is the gunpowder 5 It is made smaller than the outer diameter of the upper end of the head so that the distance between the upper electrode 4 and the gunpowder 5 is always constant.

Meanwhile, the upper end of the lower electrode part 2 and the lower end of the upper electrode part 4 are chamfered to form tapered surfaces 2a and 4a, respectively, so as to be assembled on the insulating molding body 10 for maintaining the gap ( 11) It prevents arc and flashover between the lead wire 11a and the upper and lower electrodes, and the terminal of the discharge part 15 of the upper electrode part 4 is formed to be smoothly charged and discharged with a fillet R3 or more. .

The failure indicator 1 for the lightning arrester of the present invention comprising the above-described constituent members first inserts the explosive 5 into the insertion groove 6 of the lower electrode 2 when the assembly is performed. Lightly press the gunpowder (5) to coincide with the top ground plane.

Then, the clearance holding insulating body 10 assembled with the resistor 11 is housed in the upper portion of the insulating casing 7 surrounding the lower electrode portion 2, and molded and fixed integrally with the upper insulating casing 18. The upper electrode part 4 is placed on the lower insulating casing 7 and ultrasonic welding is performed on the uneven joint surfaces 18a and 7a formed corresponding to the upper and lower insulating casings 18 and 7 to bond the upper and lower electrode parts to the polyacetal. To maintain confidentiality.

When the junction fixing is performed such that the upper and lower electrodes maintain airtightness, the upper electrode portion 4 and the lower electrode portion 2 are connected to the lightning arrester while maintaining a constant distance by the insulating molding body 10 for maintaining the gap. It is used.

The failure indicator 1 for the lightning arrester of the present invention discharges a lightning surge or a transient over voltage to the ground by invading the power system, thereby reducing the terminal voltage of the device to below the withstand voltage value. And protection against insulation breakdown of power equipment, and when the ground fault current of the system flows through the lightning arrester during long-term overheating or internal absorption due to long-term use of the lightning arrester or internal moisture absorption, The explosives 5 inside the indicator 1 are exploded and scattered to prevent damage to property, human life, fire, etc., so that they operate correctly with time-current characteristics.

As described in detail above, the lightning arrester failure indicator 1 provided in the present invention integrates the upper and lower electrode parts by an injection molding method using an insulating molding body, and assembles them together with a resistor and an explosive body to integrate the ultrasonic welding method. By fixing it provides a failure indicator for the lightning arrester with a perfect airtight structure,

Damages to property, life and fire due to explosion and scattering when ground fault current of system flows to lightning arrester during long-term overheating or internal moisture absorption of zinc oxide element due to long-term use of lightning arrester. Can be prevented from occurring, it has excellent operating characteristics in the entire current range, and the contact lead of the circuit can be excluded by ensuring that the lead wire of the resistor is firmly contacted with the upper and lower electrodes of the insulating molding body for forming the resistor. It is the invention that the expected effect is great.

Claims (6)

In constructing a failure indicator 1 for an arrester; The failure indicator 1 for the lightning arrester includes a lower electrode part 2 to which the gunpowder 5 is coupled; An upper electrode portion 4 electrically connected to the circuit through a gap between the lower electrode portion 2 and the resistor 3; The lower electrode portion 2 and the upper electrode portion 4 are integrally fixed to the insulating casing (7, 18) made of polyacetal and 0 to 30% of fiberglass by insert injection molding, The upper and lower insulating casings 7 and 18 are integrally fixed by ultrasonic welding after assembling the lower electrode 2, the resistor 3, and the upper electrode 4. One or more resistors 10 having lead wires 11a coupled to the insertion grooves 12 formed in parallel in the transverse direction on the gap holding insulating molded body 10 made of the polyacetal series constituting the resistor 3. Fault indicator for lightning arrester, characterized in that combined. The method of claim 1; The lead wire 11a of the resistor 11 is fixed to a predetermined portion at the time of ultrasonic fusion of the lower electrode portion 2 and the upper electrode portion 4 in the insulating gap body 10 for constituting the resistor 3. A failure indicator for a lightning arrester, characterized in that a lead wire (11a) fixing wiring recess (13) is formed to form a complete circuit between upper and lower electrodes. The method of claim 1; The inner diameter of the through hole 14 formed in the center of the insulating molding body 10 for maintaining the gap is made smaller than the outer diameter of the head of the upper end of the gunpowder 5 so that the gap between the upper electrode part 4 and the gunpowder 5 is reduced. Failure indicator for lightning arrestor, characterized in that it is kept constant. The method of claim 1; At least one engaging ring grooves 8 and 16 and uneven knurling portions 9 and 17 are formed in the outer edges of the lower electrode portion 2 and the upper electrode portion 4 to insert the insulating casings 7 and 18. Failure indicator for lightning arrestor, characterized in that the integral molding by the injection molding method. The method of claim 1; The upper part of the lower electrode part (2) and the lower part of the upper electrode part (4) are chamfered to form a tapered surface (2a, 4a), respectively. The method of claim 1; The terminal of the discharge portion 15 of the upper electrode portion (4) is a fault indicator for the lightning arrester, characterized in that the fillet R3 or more can be smoothly charged and discharged.

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