JPH05342952A - Gas insulation switching device - Google Patents

Abstract

PURPOSE:To provide a gas insulation switching device in which a disconnector part is not large even for a large capacity rating, and in which a wave front of a switching surge voltage can be formed gentle. CONSTITUTION:Fixed contact parts 11, 12, 13, and movable contact parts 21, 22, 23 are insulated and supported inside a metal casing 1 of a cylindrical form arted by insulation spacers. The movable contact parts 22, 23 are provided with a freely slidable movable contact 24 to get freely apart from/in contact with the fixed contact part 13. A disconnector part in which insulation gas is filled is provided in the metal casing 1. An inductance coil 31 is provided to be serially connected to the fixed contact part 11, and after the movable contact 24 gets apart from the fixed contact part 13, energization can be achieved by arc discharge with the movable contact 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear in which a busbar, a circuit breaker, a disconnector, etc. are surrounded by a cylindrical metal casing and filled with an insulating medium and an arc-extinguishing medium, and more particularly to a disconnector part thereof. .

[0002]

2. Description of the Related Art A gas-insulated switchgear is one in which a busbar breaker, a disconnector, etc. are surrounded by a cylindrical metal casing partitioned by insulating spacers and filled with insulating gas to provide ground insulation. large. Therefore, for example, in a gas-insulated switchgear in which a disconnector busbar and a circuit breaker are sequentially connected to the power supply side, when disconnecting the load side with the circuit breaker and subsequently opening the disconnector to disconnect the busbar and the circuit breaker from the power supply side, It is a common experience that the breaker in the open state and the charging current flowing to the ground capacitance of the bus bar are interrupted by the breaker, and that a disconnector with a relatively slow opening speed often re-ignites during opening. is there. This re-ignition may generate a surge voltage and threaten the insulation of the disconnector, the bus bar and the breaker together with the residual voltage on the load side. For this reason, an inductance coil and a resistor are connected in series to the disconnector to reduce the wave front of the surge voltage. FIG. 7 is a conceptual diagram showing a disconnector portion of a conventional gas insulated switchgear disclosed in, for example, Japanese Utility Model Laid-Open No. 57-40226, and FIG. 8 is a portion showing an inductance coil and a resistor in the disconnector portion of FIG. FIG. In FIGS. 7 and 8, 1 is a cylindrical metal casing filled with an insulating gas, 2 is an insulating spacer for partitioning the metal casing 1, and 3 is a conductor housed inside the metal casing 1, which is supported by the insulating spacer 2. Reference numeral 4 is a disconnecting switch that constitutes a disconnecting switch portion, 5 is an inductance coil that moderates the wave front of the surge voltage, and 6 is a resistor that absorbs the energy stored in the inductance coil 5.

The disconnector portion of the conventional gas-insulated switchgear is as described above. In FIG. 7, the left side is the power source side,
The right side is the load side after passing through the busbar and breaker of the gas insulated switchgear. When the load side is interrupted by the circuit breaker, and then the disconnector 4 is opened to interrupt the charging current flowing to the ground capacitance of the bus bar and the circuit breaker in the open state, the circuit is re-ignited and opened / closed during the opening. The surge voltage is generated, but the voltage remaining in the busbar and the circuit breaker that has been opened is the peak value of the power supply voltage, and the most severe switching surge voltage is to re-ignite when the power supply voltage reaches the peak value of the opposite polarity. become. Therefore, the inductance coil 5 and the resistor 6 which are connected in parallel are connected to the disconnector 4 so that the wave front of the switching surge voltage is moderated by the inductance coil 5 and the stored energy is absorbed by the resistor 6. Since the load current flowing through the disconnector portion does not flow through the resistor 6 but through the inductance coil 5,
The inductance coil 5 must have a size corresponding to the rated current and the rated short-time current.

[0004]

The conventional gas-insulated switchgear is constructed as described above, and the inductance coil 5 and the resistor 6 are connected in parallel to each other in the disconnector portion to provide a load current to the inductance coil 5. Therefore, the inductance coil 5 must have a size corresponding to the rated current and the short-time current, and there is a technical problem to be solved that the disconnector portion becomes large when the rated capacity is large.

The present invention has been made in order to solve the above-mentioned problems, and the disconnector portion does not become large even if the rated capacity is large, and the wave front of the switching surge voltage can be made gentle. An object is to provide a gas insulated switchgear.

[0006]

A gas insulated switchgear according to the present invention insulates and supports a fixed contact portion and a movable contact portion inside a cylindrical metal casing partitioned by an insulating spacer and slides on the movable contact portion. A fixed contact part of a movable contact that is provided with an inductance coil that is connected in series to the fixed contact part, in which a movable contact is provided so that the movable contact can be separated from and contacted by the fixed contact part and the metal casing has a disconnector part filled with insulating gas. After the disconnection from, the electric current is supplied by arc discharge with the movable contact.

[0007]

The inductance coil according to the present invention is energized by arc discharge with the movable contact after the movable contact is separated from the fixed contact portion.

[0008]

【Example】

Example 1. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing the inductance coil applied in FIG. 1 and 2, 1 is the same metal casing as the conventional one, 11 is a fixed electrode that constitutes a fixed contact portion, 12
Is a fixed conductor attached to the fixed electrode 11, 12a is a fixed conductor 12
, 13 is a tulip contact attached to the fixed conductor 12, 14 is an electric field relaxation shield attached to the fixed conductor 12, 15 is a shield attached to the fixed electrode 11, and 21 is a movable contact portion. Movable electrode, 22 is a movable conductor attached to the movable electrode 21, 23 is a tulip contact attached to the movable conductor 22, 24 is a movable contact slidably attached to the movable conductor 22, and is separated from the tulip contact 13 of the fixed conductor 12. It is free. Reference numeral 25 is an electric field relaxation shield attached to the movable electrode 21, 31 is an inductance coil attached to the fixed electrode 11, and a conductor is wound in a coil shape, and the shield 15 is also attached. The fixed contact part includes the fixed electrode 11, the fixed conductor 12, and the arc horn 12a.
, A tulip contact 13, and an electric field relaxation shield 14, and the movable contact portion includes a movable electrode 21, a movable conductor 22, a tulip contact 23, and an electric field relaxation shield 25.

This embodiment is configured as described above, and in the closed state, the movable contact 24 slides on the movable conductor 22 and the tulip contact 23 to come into contact with and engage with the tulip contact 13 attached to the fixed conductor 12. Because
The inductance coil 31 is not energized. When the circuit is opened, the movable contact 24 separates from the tulip contact 13 of the fixed conductor 12, and the tip of the movable contact 24 shields.
After passing through 15, the movable contact because the insulation distance is short
The arc is re-ignited between the shield 24 and the shield 15, and the fixed electrode 11 is energized from the shield 15 through the inductance coil 31, and the inductance coil 31 loosens the wave front of the switching surge voltage due to the re-ignition. When the movable contact 24 is opened, a predetermined insulation distance between the shield 15 and the electric field relaxation shield 25 is obtained. Since the inductance coil 31 is energized for a very short time when re-igniting between the movable contact 24 and the shield 15, it is not necessary to make the inductance coil correspond to the rated current or the rated short-time current, and the size can be reduced. it can.

Embodiment 2. FIG. 3 is a sectional view showing another embodiment of the present invention, in which the inductance coil 32 has a conductor wound around the insulating cylinder shown in FIG. 4, and a plurality of inductance coils 32 are attached to the fixed electrode 11. shield
It is inserted in parallel between 15 and the fixed electrode 11. Even in the case of the inductance coil 33 in which the conductor wound in the cylindrical insulator shown in FIG. 5 is embedded, the conductor having the arc shape (superior arc) shown in FIGS. There may be two inductance coils 34 connected in series, and any of them can achieve the intended purpose.

[0011]

As described above, according to the present invention, since the inductance coil is provided in series with the fixed contact portion and the movable contact is separated from the fixed contact portion, current is supplied by arc discharge with the movable contact. The coil can be made small, the disconnector portion does not become large even if the capacity is rated, and the wave front of the switching surge voltage can be made gentle.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing the inductance coil of FIG.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a plan view showing the inductance coil of FIG.

FIG. 5 is a plan view showing another inductance coil applicable to the embodiment of FIG.

6 is a plan view (A) and a side view (B) showing still another inductance coil applicable to the embodiment of FIG.

FIG. 7 is a partial sectional view showing a disconnector portion of a conventional gas insulated switchgear.

8 is a partial cross-sectional view showing an inductance coil and a resistor in the disconnector portion of FIG.

[Explanation of symbols]

 1 metal casing 11 fixed electrode 12 fixed conductor 13 tulip contact 15 shield 21 movable electrode 22 movable conductor 23 tulip contact 24 movable contact 25 electric field relaxation shield 31 inductance coil 32 inductance coil 33 inductance coil

Claims (1)

[Claims] 1. A stationary metal contact and a movable metal contact are insulated and supported inside a cylindrical metal casing partitioned by an insulating spacer, and a slidable movable contact is provided on the movable metal contact to provide the fixed metal contact. In a gas-insulated switchgear having a disconnecting switch portion in which the metal casing is filled with an insulating gas, the inductance coil is provided in series connection with the fixed contact portion, and the movable contact is opened from the fixed contact portion. A gas-insulated switchgear that is energized by arc discharge with the movable contact after the separation.