JPH10336817A - Sealed distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operating stability by setting a positioning relation between a load side disconnecting part and a movable contact so that the front end of the movable contact may be brought into pressure contact with an inner conductor in the insulation tube of the load side disconnecting part by a spring at the time of closing a shutter, and bending the movable contact in its middle part. SOLUTION: A shutter 2 is opened and closed with the movement of a circuit breaker 6 which is connected with the shutter 2 fitted at the front surface of a main circuit disconnecting part 5 on power source side through a link 4 from a shutter driving lever 3 and is mounted on a circuit breaker drawer 1. When the shutter 2 is in a closed condition, a movable contact 8 comes into contact with the lower surface of an inner conductor 14 fitted at a main circuit disconnecting part 7 on load side, and is brought into pressure contact with the conductor 14. The middle part of the movable contact 8 is bent so that the movable contact 8 may come into no contact with the inner periphery part of an insulation tube during its operation for reduction in an operating track. It is thus possible to improve the operating stability of a sealed distribution board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution panel used for general industrial facilities such as buildings and public facilities, and power facilities such as substations, and more particularly to a closed distribution panel provided with a device for automatically measuring insulation resistance. Related to the device.

[0002]

2. Description of the Related Art In power distribution equipment, it is important to perform periodic inspection and maintenance in order to maintain initial performance and continue normal operation. After completing this inspection and maintenance, it is necessary to determine the quality of the switchboard equipment accurately.
Generally, insulation resistance measurement is performed.

[0003] This is convenient because it is possible to make a comprehensive judgment including the line side conductor of the distribution board and the load of the high-voltage cable and electric motor, etc., so in a thermal power plant, there is a demand for the distribution board to have this function. Have been.

[0004] The automatic insulation resistance measuring device installed in the conventional closed switchboard device is provided with an insulation resistance measuring circuit and a contact for a grounding circuit that are linked to the shutter device of the closed switchboard. In the closed state, the load-side disconnection portion center conductor is automatically brought into contact.

Hereinafter, a closed switchboard having a conventional insulation resistance automatic measuring device will be described with reference to FIGS. FIG. 8 shows a state in which the circuit breaker 6 is disconnected from the main circuit disconnecting parts 5 and 7 and the shutter 2 is closed in the circuit breaker drawer 1 in the closed switchboard having the automatic insulation resistance measuring device. FIG. 9 shows a state where the circuit breaker 6 is connected to the main circuit disconnecting parts 5 and 7 and a state where the shutter 2 is open.

A shutter provided on the front side of the main circuit disconnecting section 5 on the power supply side from the shutter driving lever 3 via the link 4
2, the shutter 2 is opened and closed with the movement of the circuit breaker 6 mounted on the circuit breaker drawer 1.
In addition, an insulating support plate 11 is movably provided on the front side of the main circuit disconnecting portion 7 on the load side, is connected to the shutter drive lever-3, and moves with the lateral movement of the circuit breaker drawer 1,
It is configured to operate in the vertical direction together with the shutter-2.

FIGS. 10 to 13 show details of the insulation resistance automatic measuring device. The movable contact 8 for measuring the insulation resistance is hingedly mounted on the mounting bracket 9, and the portion is shown in FIG.
A torsion coil spring 10 for applying a rotational force in the arrow direction X of FIG.

Further, the mounting bracket 9 is fixed to an insulating support plate 11 and is connected to a mega outlet (terminal for measuring insulation resistance) 13 via an electric wire 12. FIG. 10 shows a position where the shutter-2 is closed. At this time, the movable contact 8 comes into contact with a vertical surface which is the front surface of the center conductor 14 of the main circuit disconnecting portion 7 on the load side. At the same time, since a torque is given by the torsion coil spring 10, the movable contact 8 is pressed against the center conductor 14.

On the other hand, when the shutter 2 is open as shown in FIGS. 11 and 12, the movable contact 8 separates from the center conductor 14 and slides (moves) upward on the guide (guide) plate 15. It can be guided and folded vertically, leaving a sufficient distance from the central conductor 14.

[0010] The circuit breaker drawer 1 configured as described above.
In this case, there is an advantage that the insulation resistance measuring circuit is automatically configured by entering / exiting the circuit breaker 6, and is mechanically interlocked with the shutter 2, so that safety is high and no interlock is required.

[0011]

In the prior art, the shape of the center conductor of the main circuit disconnecting portion includes a cylindrical shape in which the main circuit disconnecting portion 17 on the circuit breaker 6 side shown in FIG. As shown in FIG.
There are two types of flat plate-shaped members that serve as finger contacts, and a lubricant is applied to the contact sliding surface of the main circuit disconnecting portion 17.

In the conventional insulation resistance automatic measuring device, when the central conductor 14 has a cylindrical shape as shown in FIG. 14, the strip-shaped movable contact 8 is connected to the main circuit disconnecting portion 7 on the load side. It was possible to make contact at the portion of the center conductor 14 where no lubricant was applied (the front surface of the center conductor).

However, as shown in FIG. 15, when the center conductor 14 is used in the case of a flat plate shape, a portion where the lubricant is not applied (the front surface of the center conductor) has a small area.
It is difficult to make contact at the vertical end of the center conductor 14. Further, in the case where the lubricant is applied at a portion where the lubricant is applied, there is a possibility that a poor conduction may occur due to the deterioration of the lubricant over time, so that the contact state may be deteriorated.

If the movable contact has a simple strip shape, the main circuit disconnecting portion 7 is reduced in size and weight. If the diameter B inside the main circuit disconnecting portion 7 cannot be increased as shown in FIG. During operation, there is a risk of contact with the inner peripheral surface of the insulating cylinder.

Therefore, the present invention provides a closed switchboard device as a circuit breaker drawer having an insulation resistance automatic measuring device whose reliability does not decrease due to the shape of the center conductor of the load side main circuit disconnecting portion and the insulating cylinder. The purpose is.

[0016]

In order to achieve the above object, according to the present invention, an insulating support plate provided horizontally between shutter drive levers provided vertically on a side wall has one end connected to the insulating support plate side. A strip-shaped movable contact that is rotatably mounted and connected to a ground circuit, and a spring that applies a torque to the movable contact in a load-side disconnection direction is provided. The positional relationship is such that when the shutter is closed, the tip of the movable contact is installed by a spring so as to press against the center conductor in the insulating cylinder at the load side disconnecting part, and the movable contact is bent at the center. To provide a closed switchboard device.

Further, the present invention provides a closed switchboard device characterized in that the movable contact has a bent shape on both sides of the end on the contact portion side.

Further, in the present invention, there is provided a closed switchboard device wherein the movable contact slides on the contact portion until the movable contact comes into contact with the center conductor portion in the insulating cylinder of the load side disconnection portion until the operation is stopped. I do.

In the closed switchboard apparatus configured as described above, it is possible to provide a highly reliable automatic insulation resistance measuring device in a contact state irrespective of the shapes of the insulating cylinder and the center conductor at the load-side main circuit disconnecting portion. It becomes possible.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the closed switchboard apparatus of the present invention will be described. FIG. 1 shows a state in which the shutter 2 is closed and FIG. 2 shows a state in which the shutter 2 is open in the circuit breaker lead-out device in the closed switchboard having the insulation resistance automatic measuring device of the present invention.

A shutter provided on the front surface of the main circuit disconnecting portion 5 on the power supply side from the shutter driving lever 3 via the link 4
2, the shutter 2 is opened and closed with the movement of the circuit breaker 6 mounted on the circuit breaker drawer 1. Further, the insulating support plate 11 is movably provided on the front surface of the main circuit disconnecting portion 7 on the load side, is connected to the shutter driving lever-3 or the link 4, and operates together with the shutter-2.

3 to 6 show details of the insulation resistance automatic measuring device. The movable contact 8 for measuring insulation resistance is hingedly mounted on a mounting bracket 9, and a torsion coil spring 10 for applying a rotational force in the direction of arrow X in FIG. 6 is incorporated therein. Further, the mounting bracket 9 is fixed to an insulating support plate 11 and connected to a mega outlet 13 via an electric wire 12.

FIG. 3 shows the position when the shutter 2 is closed. At this time, the movable contact 8 comes into contact with the lower surface of the center conductor 14 attached to the main circuit disconnecting portion 7 on the load side. At the same time, since a rotating force is applied by the torsion coil spring 10, the movable contact 8 is pressed against the center conductor 14.

On the other hand, when the shutter 2 is in the open state,
As shown in FIGS. 4 and 5, the movable contact 8 is guided by the guide plate 15 while being slid upward, is folded vertically, and can be separated from the center conductor 14 by a sufficient distance.

A lubricant is applied to the lower surface of the center conductor 14 of the main circuit disconnecting portion 7 on the load side, which is a contact portion of the movable contact 8, but conduction at the contact portion due to deterioration of the lubricant over time. In order to avoid a defect, both sides of the distal end portion 16 of the movable contact 8 are bent to provide a bent portion 16A. With this shape, the contact surface pressure can be improved by about 20 times as compared with the case where the contact is made in a conventional strip shape.

Further, even if the shape of the insulating cylinder of the main circuit disconnecting portion 7 on the load side is smaller than that of the conventional product, and the diameter A shown in FIG. The central portion of the movable contact 8 is bent so as not to come into contact with the inner peripheral portion of the cylinder, thereby reducing the operation trajectory.

Further, as shown in FIG. 6, the movable contact 8 having bent portions on both sides of the distal end portion 16 and having a bent portion 16A is provided at the center of the main circuit disconnecting portion 7 on the load side on which a lubricant is applied. After the contact with the conductor 14, the contact surface is slid until the operation is stopped, so that the lubricant at the contact portion, which causes a conduction failure, can be removed from the contact surface when the movable contact 8 slides. Has become.

FIG. 7 shows a movable contact 8 characterized in that a tip 16 is provided with a projection 16B.

As described above in detail, according to the present invention, there is provided a closed switchboard apparatus having a highly reliable automatic insulation resistance measuring device for a contact state irrespective of the shapes of an insulating cylinder and a center conductor at a load-side disconnecting portion. be able to.

[0030]

According to the present invention, the operational safety of the closed switchboard apparatus can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a closed switchboard apparatus showing an embodiment of the present invention in an open circuit state.

FIG. 2 is a sectional view showing a closed state of the closed switchboard device of FIG. 1;

FIG. 3 is a sectional view showing details of a main circuit disconnecting section of FIG. 1;

FIG. 4 is a sectional view for explaining the operation of FIG. 3;

FIG. 5 is a sectional view for explaining the operation of FIG. 4;

FIG. 6 is a perspective view illustrating an embodiment of the movable contact shown in FIG.

FIG. 7 is a perspective view illustrating another movable contact.

FIG. 8 is a sectional view of a conventional closed switchboard device in an open circuit state.

9 is a sectional view showing a closed state of the closed switchboard device of FIG. 8;

FIG. 10 is a sectional view showing details of a main circuit disconnecting portion of FIG. 8;

FIG. 11 is a sectional view for explaining the operation of FIG. 10;

FIG. 12 is a cross-sectional view illustrating the operation of FIG.

FIG. 13 is a perspective view illustrating the movable contact shown in FIG.

FIG. 14 is a front sectional view of a tulip contact.

FIG. 15 is a front sectional view of a finger contact.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit breaker draw-out device 2 Shutter 3 Shutter drive lever 4 Link 5 Main circuit disconnecting part 6 Circuit breaker 7 Main circuit disconnecting part 8 Movable contact 9 Mounting bracket 11 Insulating support plate 12 Electric wire 13 Mega outlet 14 Center conductor

Claims (4)

[Claims] A circuit breaker inserted into or separated from a main circuit disconnecting portion on a power supply side and a main circuit disconnecting portion on a load side to interrupt connection to a center conductor; A shutter provided between the circuit breaker to prevent insertion of the circuit breaker, a link for moving the shutter up and down as the circuit breaker is inserted or opened, and a link between the link and the circuit breaker A shutter drive lever that engages with the device, an insulating support plate rotatably mounted on the upper portion of the link, and one end attached to the insulating support plate and the other end connected to the load-side center conductor by torque from a spring. A closed switchboard device comprising: a movable contact mounted so as to be in contact with each other, wherein the movable contact has a bent or curved shape at a central portion. 2. The closed switchboard device according to claim 1, wherein a protrusion is provided at a tip of the movable contact in parallel with a drawing direction of the circuit breaker. 3. The closed switchboard device according to claim 1, wherein both side surfaces of a tip portion of the movable contact are bent inward to form a protrusion parallel to a drawing direction of the circuit breaker. 4. The projection according to claim 1, wherein the movable contact comes into contact with the protrusion in a section from when the movable contact comes into contact with the center conductor of the load-side disconnection section until the operation stops. The closed switchboard apparatus according to claim 3.