JP6877310B2 - Disconnector - Google Patents

Description

The present invention relates to a disconnector that opens and closes a main circuit.

Patent Document 1 describes a disconnector having a configuration in which a movable blade is pressed against a fixed side terminal by a spring force in a gas-insulated switchgear. Patent Document 1 describes a contact spring holding device of a disconnector in which a convex portion is provided on a surface of a spring retainer in contact with a contact spring and the convex portion is fitted into a hollow portion of the contact spring.

JP-A-6-223683

Patent Document 1 describes a structure capable of obtaining contact pressure on the fixed side electrode without the spring coming off due to the sliding resistance of the movable blade. However, in the movable blade structure of the disconnector described in Patent Document 1, when an electromagnetic force due to an energizing current acts on the blade, the distance between the movable blades is widened due to spring contraction, and poor contact may occur. Therefore, there is a possibility that an arc is generated between the movable blade and the fixed side electrode, leading to melting damage.

An object of the present invention is to provide a disconnector capable of preventing contact failure due to electromagnetic force.

The above object includes a current-carrying conductor, a fixed electrode, and a movable blade connected to the current-carrying conductor and composed of a first member and a second member, and between the first member and the second member. In a disconnector that brings the first member and the second member into contact or non-contact with the fixed electrode, the distance between the first member and the second member is widened in the vicinity of the contacting or non-contact portion. A pressure means for pressing the first member and the second member against the fixed electrode by providing a spread limiting means for limiting, a space holding means for maintaining a distance between the first member and the second member, and a conductive means. This is achieved by the contact between the first contact material having properties and elasticity and the first member and the fixed electrode via the first contact material.

According to the present invention, it is possible to provide a disconnector capable of preventing contact failure due to electromagnetic force.

The figure which shows the disconnector blade part configuration which concerns on 1st Embodiment. The figure which shows the form at the time of electromagnetic force action. The figure which shows the whole state of the disconnector. The figure which shows the disconnector blade part configuration which concerns on 2nd Embodiment. The figure which shows the form at the time of electromagnetic force action. FIG. 3 is a view of FIG. 3 seen from an AA cross section. The figure which shows the direction of the electric current flowing through a movable blade. The figure which shows the detail of a stepped bolt. The figure which shows the detail of the grooved bolt.

Hereinafter, examples will be described with reference to the drawings.

Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3.

1 and 2 are side views showing a part of the disconnector according to the first embodiment. FIG. 3 is an overall view showing the entire disconnector.

The disconnector of FIG. 3 has a pair of energizing conductors 2 and 2a arranged to face each other in the metal container 1, and is rotatable to a fixed side electrode 3 attached to the energizing conductor 2 and the other energizing conductor 2a. A blade-type disconnector provided with a movable blade 4 that is attached and detached from the electrical contact surface of the fixed side electrode 3.

FIG. 6 shows a view of FIG. 3 from the cross section taken along the line AA. In this disconnector, which is a three-phase batch, three sets of movable blades 4 are arranged via a rod 12 connected to a shaft 11 arranged in the horizontal direction in the metal container 1. A motor is connected to the shaft 11, and the movable blade 4 whose rotation by the motor is transmitted from the shaft 11 and the rod 12 rotates in the direction of “arrow 13” in FIG. The road is "on" and "off". The charging path at this time refers to a circuit in an electrically charged state after the load current is cut off by a disconnector (by turning off the disconnector, the charging path is made section-independent and then grounded and opened / closed. The vessel will be turned "on" and the section will be grounded to carry out inspections, etc.).

FIG. 1 is a view showing a state in which a movable blade 4 composed of two members is in contact with a fixed electrode 3 from above. The upper and lower movable blades 4 shown in the figure are connected by a pin 6 and C rings 15 provided at both ends of the pin 6 with a rod 12 and a washer 14 sandwiched between them. By sandwiching the rod 12 and the washer 14 between them, the distance between the upper and lower movable blades 4 is maintained at a certain level or more. At the time of energization, the fixed electrode 3 is slidably inserted between the set of movable blades 4, and the energizing conductor 2 and the energizing conductor 2a are electrically connected via the contact 8 or the like.

The pressing force on the contact 8 required for energization is obtained from the repulsive force of the spring 7 generated from the tightening force of the stepped bolt 5. Here, by applying the pressing force between the contact 8 and the solid side electrode 3 by the spring 7 having an appropriate spring force, the fitting dimension of the movable blade 4 and the fixed side electrode 3 has a likelihood. It is possible to prevent damage to the movable blade 4 and the fixed electrode 3.

Here, the contact 8 is composed of a contact (material Cu) to be energized and a spring portion (material BeCu) having elasticity. The amount of displacement of the spring portion that can ensure electrical conductivity is determined, and within this amount of displacement, the spacing width of the movable blade 4 is set and assembled with respect to the width of the fixed electrode 3. For example, assuming that the displacement amount is 0.5 mm, the blade spacing is 22 m to 22.5 mm with respect to the fixed electrode width of 22 mm (when the movable blade spacing is maximum, the movable blade is in a state where the fixed electrode is closer to one side between the movable blades. It is assembled so that the gap between the fixed electrode and the fixed electrode does not become uncontacted below the displacement of the contact).

Further, this damage refers to damage caused by the tip (contactor) of the contact attached to the blade sliding on the fixed electrode. For example, considering the case where the disconnector is turned "off" ⇒ "on" when the blades are assembled with a blade spacing of 22.5 mm, the tip spacing of the contact contacts attached to the blades is 21.5 mm. Therefore, the movable blade slides on the fixed electrode while compressing the contact spring portion by 0.5 mm on both sides. At this time, if the spring force of the spring 7 is made strong in order to resist the electromagnetic force at the time of energization, the sliding resistance increases and the spring 7 is easily damaged.

Next, the force acting on the movable blade 4 when energized is shown in FIGS. 2, 6 and 7. In this example, when energized, an electromagnetic force acts on the movable blade 4 in the X direction. As shown in FIG. 7, a current momentarily flows through the A phase, the B phase, and the C phase, and an electromagnetic force is generated in the X direction. When the distance between the movable blades 4 is about to be widened by this electromagnetic force, the stepped surface of the stepped bolt 5 comes into contact with the adapter 10 attached to the movable blade 4 to limit the range in which the distance between the movable blades 4 is widened. To do. Furthermore. The contact 8 absorbs the spread of the interval due to its elasticity, and maintains and secures the electrical contact between the movable blade 4 and the fixed electrode 3.

Here, FIG. 8 shows the details of the stepped bolt 5. The stepped surface A of FIG. 8 is not in contact with the adapter 10 at the beginning in FIG. 1, but at the start of energization or interruption, the distance between the upper and lower movable blades 4 is momentarily widened due to the influence of electromagnetic force, and the spring 7 Shrinks. When the contraction of the spring 7 becomes large, the stepped surface A comes into contact with the adapter 10 as shown in FIG. Upon contact, the stepped surface A of the stepped bolt 5 and the nut tightened to the tip of the stepped bolt 5 limit the distance between the upper and lower movable blades 4 due to electromagnetic force from further widening. In this example, the adapter 10 is made of SS400 material, and the movable blade 4 is installed in a deep counterbore. This is because the movable blade 4 is too thin to directly sandwich the spring 7 between the movable blade 4 and the head of the stepped bolt 5, so a space into which the spring can be inserted is secured by applying the adapter 10.

FIG. 2 shows a state in which the distance between the movable blades 4 is maximized due to electromagnetic force (the stepped surface of the bolt 5 and the seat surface of the adapter 10 interfere with each other). Here, too, the elasticity of the contact 8 itself absorbs the gap with the fixed electrode 3, and even if the distance between the movable blades 4 is widened to this state, the state of sufficient contact with the fixed electrode 3 is maintained. ..

The upper and lower movable blades 4 are fastened by the pins 6 installed near the center and the C rings 15 attached to both ends thereof, but naturally there is "play" in order to take the assembly likelihood. By the amount of this "play", the space between the upper and lower movable blades 4 can be widened. Moreover, the C ring 15 alone does not have the force to keep the distance between the movable blades 4 wide when the electromagnetic force acts. FIG. 2 depicts a state in which the movable blades 4 are extremely spaced apart. By providing the stepped bolt 5 in the vicinity of the fixed electrode 2 (for example, on the fixed electrode 2 side of the pin 6), it is possible to more effectively limit the spread of the interval between the movable blades 4 due to the electromagnetic force.

Next, a second embodiment will be described with reference to FIGS. 4 and 5. In FIGS. 4 and 5, the same reference numerals as those in FIGS. 1 to 3 indicate the same parts, and thus the description thereof will be omitted again. In the first embodiment, the stepped bolt 5 was used in order to suppress the expansion of the distance between the movable blades 4 due to the electromagnetic force within a certain range, but in the second embodiment, the spring as shown in FIG. A grooved bolt 9 is used. The head side surface of the bolt 9 is lengthened in the axial direction, and the spring is installed in the groove provided between the bolt 9 and the screw diameter.

Similar to the first embodiment, FIG. 5 shows that the adapter 10 attached to the movable blade 4 and the groove mouth surface of the grooved bolt 9 interfere with each other when an electromagnetic force is applied to limit the range in which the distance between the movable blades 4 is widened. Furthermore. The elastic contact 8 maintains and secures electrical contact between the movable blade 4 and the fixed electrode 3.

Details of the grooved bolt 9 are shown in FIG. The spring is stored in the groove. When this spring cannot withstand the electromagnetic force, the groove mouth surface comes into contact with the adapter. Due to this contact, the groove mouth surface and the nut tightened to the tip of the stepped bolt 5 limit the widening of the distance between the upper and lower movable blades 4 due to the electromagnetic force.

The present invention is not limited to the above-described examples, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

1 ... Metal container 2, 2a ... Conducting conductor 3 ... Fixed electrode 4 ... Movable blade 5 ... Stepped bolt 6 ... Pin 7 ... Spring 8 ... Contact 9 ... Spring grooved bolt 10 ... Adapter 11 ... Shaft 12 ... Rod 14 ... Washer 15 ... C ring

Claims (8)

With a current-carrying conductor
With fixed electrodes
A movable blade connected to the current-carrying conductor and composed of a first member and a second member is provided.
In a disconnector that causes the first member and the second member to contact or not contact the fixed electrode between the first member and the second member.
A spread limiting means for limiting the spread of the distance between the first member and the second member is provided in the vicinity of the contacting or non-contact portion.
A pressing means for pressing the first member and the second member against the fixed electrode, and
An interval holding means for maintaining an interval between the first member and the second member,
The first contact material with conductivity and elasticity,
A disconnector characterized in that the first member and the fixed electrode come into contact with each other via the first contact material. In claim 1 ,
Equipped with a second contact material with conductive and elastic force,
A disconnector characterized in that the second member and the fixed electrode come into contact with each other via the second contact material. In claim 2 ,
It is provided with a plurality of the pressing means.
A disconnector characterized in that the interval holding means is arranged between the plurality of pressing means. In claim 3 ,
The spread limiting means is
It is configured to include a bolt provided so as to penetrate the first member and the second member, and a nut fixed to the tip of the bolt.
A disconnector characterized in that the head of the bolt comes into contact with the first member to limit the spread. In claim 4 ,
An adapter is provided between the head of the bolt and the first member.
The bolt is a stepped bolt having a step formed on the head, or a grooved bolt having a groove formed on the head.
The spread limiting means is characterized in that the stepped surface of the stepped bolt or the groove mouth surface of the grooved bolt comes into contact with the first member via the front adapter to limit the spread. Disconnector. In claim 5 ,
The pressing means is a spring through which the shaft of the bolt penetrates, and the spring is arranged between the head of the bolt and the first member in a contracted state.
The spacing holding means includes a rod material penetrating the first member and the second member, stopping members provided at both ends of the rod material sandwiching the first member and the second member, and said A disconnector characterized in that a bar member penetrates and is composed of an interval member provided between the first member and the second member. In claim 6 ,
A disconnector characterized in that the movable blade is driven by the force of a motor to bring the first member and the second member into contact with or non-contact with the fixed electrode. In claim 1,
A plurality of sets of the energizing conductor and the movable blade having different phases are provided.
A disconnector characterized in that the plurality of sets are simultaneously brought into contact with or not in contact with each other.

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