JPH0562566A - Operating rod for gas insulated apparatus using sulphur hexafluoride - Google Patents

Abstract

PURPOSE:To provide an operating rod for a SF6 gas insulated apparatus of a structure such as to admit high voltage, allow embodying compactly, and prevent crack initiation. CONSTITUTION:An operating rod concerned, which is used in an apparatus using SF6 gas as an insulation medium, has a rod-shaped molding 1 of glass fiber reinforced epoxy resin, whose surface is covered with an insulative layer 2 consisting of a rubber series highpolymer member chiefly containing vulcanized polybinylidene fluoride or ethylene propylene diene monomer having a low dielectric constant. An adhesive 3 is applied, as required, to the interface between the epoxy molding 1 and insulative layer 2 to strengthen the bond of two materials.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating rod used for a breaking part of a gas insulated switchgear (GIS), a gas circuit breaker (GCB), etc. of an ultrahigh voltage.

[0002]

2. Description of the Related Art An operating rod used in GIS or GCB is usually made of a rod-shaped glass fiber reinforced epoxy resin molded article having excellent insulating properties and high mechanical strength.

Under ordinary circumstances, this glass fiber reinforced epoxy resin molded article achieves its object sufficiently in terms of insulating properties and mechanical strength, but in sulfur hexafluoride gas (hereinafter referred to as SF ₆ gas). In, there are the following problems.

[0004] That is, SF ₆ gas is decomposed as SF ₆ → SF ₄ + F ₂ by a high energy by a large current arc generated upon current interruption of the circuit breaker or switch, further SF ₆
The decomposed gas chemically reacts with the water in the air and the insulator, and S
Produces highly corrosive hydrofluoric acid such as F ₄ + 2H ₂ O → SO ₂ + 4HF. This hydrofluoric acid is composed of silicon oxide, which is the main component of the reinforced fiber glass of the operating rod, and SiO ₂ + 4HF → Si.
It reacts like F ₄ + 2H ₂ O to become a strong electric field substance having a low insulation resistance value, and extremely deteriorates the insulation characteristics.

Therefore, the glass fiber reinforced epoxy molded product cannot be used as it is as an operating rod for a shutoff portion of an SF ₆ gas insulation system or the like.

Therefore, the present applicant has previously proposed an operation rod in which the surface of a glass fiber reinforced epoxy resin molded product is molded with an alumina-filled epoxy resin (Japanese Patent Application No.
248196).

[0007]

The operating rod is S
Although it has been proved that it is resistant to F ₆ decomposed gas and solves the conventional problems, it has been found that the following problems remain.

That is, the dielectric constant of the molded product is about 6.0 due to the influence of the dielectric constant 9.3 of alumina itself, which is 3.0.
Compared with a glass fiber reinforced epoxy resin molded product (silica: SiO ₂ ) having a dielectric constant of about the same, the value is about twice as high. Table 1 shows the relationship between the dielectric constant and the creeping flashover voltage [kV] when the distance between the electrodes is 10 [mm].

[0009]

[Table 1]

As is clear from Table 1, the creeping flashover voltage value decreases as the dielectric constant increases. Therefore, it is difficult for the operating rod molded with the epoxy resin filled with alumina to achieve high voltage and compactness.

Further, since the epoxy resin molded product itself is hard and brittle, it does not follow the deformation such as pulling, bending, and bending during the operation of the operating rod, and peels at its interface. It causes cracks and reduces the reliability of the insulation device.

The present invention has been made to solve the above problems, and provides an operating rod for SF ₆ gas-insulated equipment, which has a structure that facilitates high voltage and compactness and does not cause cracks and the like. With the goal.

[0013]

The operation rod for SF ₆ gas insulation equipment of the present invention comprises a rod-shaped glass fiber reinforced epoxy resin molded article, a surface of which is a polyvinylidene fluoride vulcanized product,
Alternatively, it is covered with an insulating layer made of a rubber-based polymer member containing ethylene propylene diene monomer as a main component.

A groove is formed on the surface of the glass fiber reinforced epoxy resin molded product to increase its surface area.

[0015]

[Function] Both the polyvinylidene fluoride vulcanizate and the rubber-based polymer material containing ethylene propylene diene monomer as a main component are strong against SF ₆ decomposition gas and have flexibility, adhesiveness, heat resistance and workability. Excellent in Further, since the dielectric constant is lower than that of the alumina-filled epoxy resin, the creeping flashover voltage value does not decrease.

Of these insulating layers, the rubber-based polymer member containing ethylene propylene diene monomer as a main component follows well the deformation such as pulling, bending, and bending during the operation of the operating rod, and therefore adheres. Although it adheres to the surface of the glass fiber reinforced epoxy resin molded product without applying the agent, peeling and cracking are less likely to occur by applying an adhesive to these interfaces and firmly adhering.

By forming grooves on the surface of the glass fiber reinforced epoxy resin molded product, contact (adhesion) with the insulating layer is achieved.
Since the area, the contact area with the adhesive, and the contact area between the adhesive and the insulating layer are increased, interfacial peeling and cracks are less likely to occur.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 shows a side sectional structure view of an operating rod for SF ₆ gas insulation equipment according to a first embodiment of the present invention, in which 1 is a glass fiber reinforced epoxy resin molded product. 2 is an insulating layer, 3 is an adhesive, 4 is a mounting jig (metal fitting)
Represents.

The glass fiber reinforced epoxy resin molding 1 is
Similar to the conventional one, it is called a G rod, and is a rod-shaped body having a circular cross section and having a strength capable of withstanding mechanical force.

The insulating layer 2 is made of a rubber-based polymer member containing ethylene propylene diene monomer (EPDM) as a main component, and in order to adhere the insulating layer 2 to the glass fiber reinforced epoxy resin molded article 1, a cyano resin is used. An acrylate adhesive 3 such as Aron Alpha manufactured by T Co. is used.

The operating rod for SF ₆ gas insulation equipment is molded by the following procedure.

First, the surface of the glass fiber reinforced epoxy resin molded article 1 is roughened so as to increase the adhesive strength, and then the surface is subjected to a primer treatment. For the primer, for example, Tron's Alon Alpha for polyethylene / polypropylene is used.

After the primer treatment, the adhesive 3 is applied to the surface of the glass fiber reinforced epoxy resin molded article 1 and cured. The thickness of adhesive 3 is 20 without pin holes.
The thickness is in the range of about 200 [μm], which is equal to or more than [μm] and does not crack in a high temperature / low temperature heat cycle.

This surface-treated glass fiber reinforced epoxy resin molded product 1 is incorporated into a dedicated mold, and EPD is applied to this mold.
Injection molding is performed by mixing and filling M, a curing agent, a filler, and the like.
After being vulcanized in the mold for about 30 minutes, it is solidified by cooling at room temperature, and the mold is removed when the insulating layer 2 is formed.

As a result, a SF having a three-layer structure composed of the glass fiber reinforced epoxy resin molding 1, the adhesive 2, and the insulating layer 3 is formed.
₆ Operation rod for gas insulated equipment is obtained.

Table 2 shows the results of performance tests of the operating rod of the glass fiber reinforced epoxy resin molded article 1 alone and the operating rod obtained in this example.

[0028]

[Table 2]

Referring to Table 2, it can be seen that the operating rod of this example does not significantly lower the insulation resistance value [Ω] even when exposed to SF ₆ gas, and is resistant to decomposed gas. Further, since the insulating layer 2 is flexible and is firmly adhered to the glass fiber reinforced epoxy resin molded article 1 with the cyanoacrylate adhesive 3 having good adhesive strength, the tensile strength of the operation rod is large, No interfacial peeling occurred.

As a result, the operating rod itself and the GIS and GCB using the operating rod can be highly reliable.

Further, the rubber-based polymer member forming the insulating layer 2 has excellent heat resistance and flexibility, and also has good adhesiveness with the glass fiber reinforced epoxy resin molded product 1, so that workability is improved and the cost is reduced. It has become possible to achieve this.

(Second Embodiment) In the second embodiment of the present invention, in the operating rod of the first embodiment, the insulating layer 2 is replaced with a rubber polymer member, and polyvinylidene fluoride (for example, PVDF manufactured by K Chemical Co., Ltd.) is used. The adhesive 3 is made of a vulcanized material and uses an adhesive for Teflon as the adhesive 3.

As a result, it is possible to obtain an operation rod for SF ₆ gas insulated equipment having the same performance test results and effects as those of the first embodiment.

The operating rod of this embodiment is molded by the same procedure as that of the first embodiment except that the mold is filled with polyvinylidene fluoride and injection molding is performed. Primer treatment is not always necessary.

(Third Embodiment) In the third embodiment of the present invention, in the operation rod of the first embodiment, the surface of the glass fiber reinforced epoxy resin molded article 1 is directly E-shaped without using the adhesive 3.
It is covered with an insulating layer 2 made of a rubber-based polymer member containing PDM as a main component.

The EPDM has an ethylene ratio of 50 to 50.
About 75 [wt%] with Mooney viscosity of 35-5
A material that retains a predetermined formability even when it is highly filled with an inorganic filler of 0 is used. Table 3 shows examples of constituent materials of the rubber-based polymer member used in this example.

[0037]

[Table 3]

Although carbon black is used to maintain the high temperature mechanical properties of the rubber itself, the addition amount thereof is preferably 2 [wt%] or less in order to prevent deterioration of insulating properties. In addition, in this embodiment, in particular, dolomite having a low dielectric constant that withstands SF ₆ decomposition gas is used as the filler.

Table 4 shows that the content of alumina having a dielectric constant of 9.3 is 5
FIG. 4 is a comparison of characteristic test results between a conventional alumina-filled epoxy resin molded product filled with 0 [vol%] and the operating rod of this embodiment in which the insulating layer 2 is formed of a rubber-based polymer member.

[0040]

[Table 4]

Referring to this table, the operating rod of this embodiment has a lower dielectric constant than the conventional operating rod, and
It can be seen that it has flexibility. Further, it can be seen that the hydrofluoric acid-resistant surface resistivity [Ω] is large and the insulating property is excellent.

Therefore, the surface flashover characteristics are improved, the high voltage and the downsizing are facilitated, and the adhesive action of the rubber polymer member itself suppresses the occurrence of interfacial peeling and cracks without using an adhesive. The reliability of the operating rod itself and the insulating device using this operating rod can be improved.

(Fourth Embodiment) FIG. 2 shows a side sectional structure view of an operating rod for SF ₆ gas insulated equipment according to a fourth embodiment of the present invention. For example, in the operating rod of the third embodiment, To the extent that the mechanical strength of the glass fiber reinforced epoxy resin molded article 1 itself is not weakened, for example, a groove 1a having a ridge or a wave shape is formed on the surface thereof to increase the contact area with the insulating layer 2.

As a result, interfacial peeling and cracks are less likely to occur, and the reliability of the operating rod itself and the insulating equipment using this operating rod is significantly improved.

Even in the operation rods of the first and second embodiments, by forming the groove 1a as in this embodiment on the surface of the glass fiber reinforced epoxy resin molded article 1,
It is possible to reliably prevent peeling of the insulating layer 2.

[0046]

As described above, according to the present invention, the surface of the glass fiber reinforced epoxy resin molded article excellent in mechanical strength is a polyvinylidene fluoride vulcanized product or a rubber containing ethylene propylene diene monomer as a main component. In addition to being covered with an insulating layer made of a polymer material, if necessary, these interfaces are firmly adhered to each other by means of an adhesive, so it has sufficient mechanical strength to operate insulating equipment.
Since the dielectric constant is low, it is easy to increase the voltage and make it compact, and since it is excellent in flexibility and adhesiveness, the occurrence of interfacial peeling and cracks is suppressed. As a result, it is possible to provide an operating rod for SF ₆ gas insulation equipment, which significantly improves the reliability of the insulation equipment.

[Brief description of drawings]

FIG. 1 is a side sectional structure view of an operating rod for SF ₆ gas insulated equipment according to a first embodiment of the present invention.

FIG. 2 is a side sectional structural view of an operating rod for SF ₆ gas insulated equipment according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 ... Glass fiber reinforced epoxy resin molded product, 1a ... Groove, 2
... Insulating layer, 3 ... Adhesive, 4 ... Mounting jig.

Claims (4)

[Claims] 1. An operating rod having a rod-shaped glass fiber reinforced epoxy resin molded product, which is used in an apparatus using sulfur hexafluoride gas as an insulating medium, wherein polyvinylidene fluoride is formed on the surface of the glass fiber reinforced epoxy resin molded product. An operating rod for sulfur hexafluoride gas insulation equipment, characterized in that an insulating layer made of a vulcanized product is formed. 2. An operating rod having a rod-shaped glass fiber reinforced epoxy resin molded product, which is used in a device using sulfur hexafluoride gas as an insulating medium, wherein ethylene propylene diene is formed on the surface of the glass fiber reinforced epoxy resin molded product. An operating rod for a sulfur hexafluoride gas insulating device, characterized by comprising an insulating layer made of a rubber-based polymer member containing a monomer as a main component. 3. The operating rod for sulfur hexafluoride gas insulated equipment according to claim 1 or 2, wherein grooves are formed on the surface of said glass fiber reinforced epoxy resin molded product to increase the surface area. .. 4. The sulfur hexafluoride gas insulation device according to claim 1, wherein an interface between the glass fiber reinforced epoxy resin molded product and the insulating layer is bonded with an adhesive. Operation rod.