JPH0735261Y2 - Switch with operating power transformer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch with a transformer for operating power supply, more specifically, an SOG attached to a switch for an underground cable.
(Strage Over-current Ground relay: Ground fault relay with overcurrent accumulation trip) A switch in which a transformer for operating power supply of a controller such as a controller is integrally attached.

[0002]

2. Description of the Related Art Conventionally, the structure for mounting this type of transformer to an underground switch has been disclosed, for example, in Japanese Utility Model Publication No. 4-3465, Japanese Utility Model Publication No. 63-155238, and Japanese Utility Model Publication No. 63-15.
It is described in Japanese Patent No. 5239. Here, in the above-mentioned Japanese Utility Model Publication No. 4-3465, inside the installation foundation hole of the switch tower, a transformer is hung between the rising cables of the switch, and the primary side of the transformer is connected to the main circuit to A structure is shown in which the operating power supply is taken from the secondary side. Also, the actual development 6
In JP-A-3-155238, a transformer is built in a cabinet of a switchgear, and a primary side of the transformer is connected to a molded busbar connecting a trunk switch and a branch line switch to a secondary side of the transformer. There is shown a structure in which an operating power source is taken from the side, and JP-A-63-155239 shows a structure in which the mold bus bar and the primary side of the transformer are connected by a cable having a detachable cable head. Has been done.

Further, as another conventional technique, a paper “Development of an automatic underground section fault classification system” (p.61-p.66) published in the magazine “Electric field technology” (April 1985 issue). However, this paper also describes a structure in which a switch and a transformer are built in a distribution box for automatic supply, and the primary side of this transformer is drawn out from a cable mounting terminal of the distribution box for automatic supply.

[0004]

The above-mentioned conventional techniques have the following problems. 1) According to the transformer mounting structure described in Japanese Utility Model Publication No. 4-3465, the transformer, which is a device that is originally separate from the switch, is hung on the bottom base of the switch tower via a hanging plate. Therefore, when installing the switch tower, it is necessary to transport the switch and the transformer separately, and to suspend the cables and connect the cable to the transformer on site. Therefore, it is inconvenient to transport and manage the equipment, and
A lot of labor was required for the work of installing the transformer on the bottom base of the switch tower, the work of backfilling the soil in the foundation hole after the installation, and the work of connecting the cable of the transformer.

2) In the switchgear disclosed in Japanese Utility Model Laid-Open Nos. 63-155238 and 63-155239,
Since the switch and the transformer are separate devices as in Japanese Utility Model Publication No. 4-3465, it was inconvenient to transport and manage each device. Further, the work of connecting the primary side of the transformer to the molded busbar via the cable is complicated, and the extra length treatment of the cable is also troublesome. 3) Even in the structure described in the above-mentioned paper "Development of automatic underground section fault classification system", since the switch and the transformer are separate devices, there is the same problem as described above.

The present invention has been made in order to solve the above problems, and its purpose is to integrally attach a transformer for operating power supply to a switch body to facilitate transportation and management. An object of the present invention is to provide a switch with a transformer for an operating power supply, which eliminates the complexity of cable connection work and extra length processing by supplying power from the fixed contact side of the switch body to the primary side of the transformer.

[0007]

In order to achieve the above object, the present invention relates to a switch installed in a high-voltage switchgear on the consumer side, in which a movable contact connected to the main side and a load side are connected. Fixed contact is disposed in the casing, and a bushing is attached to the bottom of the casing, and a switch main body capable of tripping operation by an attached controller, and a primary side conductor through the bushing. A transformer for operation power supply, which is connected to the fixed contact side and supplies power to the controller from a secondary side, and the transformer for operation power supply is integrally attached below the bushing. is there.

[0008]

In the present invention, the switch is composed of the switch main body and the operating power supply transformer integrally attached to the lower part of the main body, and the operating power supply is provided in the switch which is a single device. It is equipped with a transformer. The primary conductor of the transformer for operating power supply is connected to the fixed contact side (load side) inside the switch body, and from the secondary side of the transformer,
Power is supplied to a controller such as an SOG controller that trips and opens the switch in the event of a ground fault or an overcurrent accident. For this reason, the primary side of the transformer is pre-connected inside the switch body and the wiring is not exposed outside the switch, and outside the switch, only the cable that connects the secondary side of the transformer to the controller is exposed. Wiring is enough.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing the outer appearance of the present embodiment, and FIG. 2 is a sectional view taken along the line AA of FIG.
00 is installed in the cabinet of the high-voltage switchgear installed in a high-voltage private customer, and when a ground fault accident or an overcurrent accident occurs on the load side, the contacts are instructed by a controller such as an SOG controller. It is opened to prevent the spread of accidents. 1 and 2, the switch 300 with a transformer for operating power supply is roughly classified into a switch main body 100,
The transformer unit 200 has a built-in transformer for operating power supply for supplying power to a controller (not shown).

In FIG. 2, a switch main body 100 is constructed as a gas switch in which a casing 101 is filled with SF ₆ gas, and inside the casing 101, a movable contact 102, a fixed contact 103, an operating mechanism 104, and a link. The mechanism 113 and the like are provided. The movable contact 102 is connected to a mold bus bar (not shown) on the main line side of an electric power company via an internal conductor 106 in a mold bushing 105 attached to the upper end of the casing 101, and the fixed contact 103 is It is connected to an underground cable (not shown) on the load side via an internal conductor 108 in a mold bushing 107 attached to the lower rear end of the casing 101.

A bushing 109 is erected on the bottom plate 101A of the casing 101, and the conductor 11 is provided inside the bushing 109.
0 and the fuse 111 are housed, and the conductor 110 is connected to the internal conductor 108 on the fixed contact 103 side through the lead 112.

On the other hand, below the bushing 109, the transformer section 200 is attached integrally with the switch body 100. The transformer unit 200 includes a transformer for operating power supply 202 inside a casing 201.
The pair of primary-side conductors 02 (not shown) are connected in advance to the two-phase internal conductors 108 via the fuse 111, the conductor 110, and the lead 112, respectively. That is, power is supplied to the primary side of the transformer 202 from the fixed contact 103 side (load side) of the switch body 100. Here, although not shown, the secondary side of the transformer 202 is connected to the power supply terminal of the controller via an appropriate cable and a power switch.

As shown in FIG. 1, the switch body 10
A handle operation port 114 that is a part of the operation mechanism 104 is exposed on the front surface of 0, and the movable contact 102 is rotated by rotating an operation handle attached to the operation port 114.
Can be operated manually. Further, 115 indicates an operation display needle.

Next, FIG. 3 is a single-line connection diagram showing a usage state of the present embodiment, and schematically shows a connection structure in a high-voltage switchgear 700 in which the switch 300 is installed. As is well known, this type of switchgear 700 is divided into a power company side circuit and a customer side circuit with a responsibility demarcation point as a boundary, and the power company side circuit has a trunk line via an underground cable or the like. And the main line side switch 6 connected to the other consumer side
01 and 602 are installed. Switch 3 of this embodiment
00 is the switch 601, 6 in the customer side circuit
02 via a mold bus 500, and causes the switch main body 100 to perform a ground fault trip operation or an overcurrent accumulation trip operation according to a command from an SOG control device 400 additionally installed. .

As described above, the switch 300 has the switch main body 100 and the transformer section 200 integrally formed, and as shown in the figure, the switch main body 100 is provided on the primary side of the transformer 202.
The power is supplied from the fixed contact side (load side), and the voltage stepped down by the transformer 202 is appropriately supplied to the SOG control device 400 as a power source. The SOG control device 400 is attached at an appropriate position such as the upper part of the switch 300, and the switch 300 itself is the high-voltage switch 700.
It is fixed to the customer side space in the cabinet with bolts or the like.

In the above embodiment, SO is used as the controller.
Although the case of using the G control device has been described, the type of controller is not limited to this. Further, the type of the switch main body (arc extinguishing medium etc.) may be other than the gas switch.

[0017]

As described above, according to the present invention, the switch is composed of the switch main body and the operation power supply transformer integrally attached to the lower part of the main body of the switch. It is equipped with a transformer for operating power supply. Therefore, as compared with the conventional case where the switch and the transformer are separate devices, it is possible to easily carry and manage the devices.

The primary conductor of the transformer for the operating power supply is connected in advance to the fixed contact side (load side) inside the switch body so that the wiring is not exposed to the outside of the switch. Since only the cable for connecting the secondary side to the controller is required for wiring, at least the primary side of the transformer eliminates the work of connecting the cable on site and can reduce the labor. In addition, since the cable from the primary side of the transformer is not exposed to the outside of the switch, there is no need for complicated cable routing and extra length treatment. Further, since it is not necessary to bury the transformer in the ground, labor can be reduced in this respect as well.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a single line connection diagram showing a usage state of the embodiment.

[Explanation of symbols]

 100 Switch Main Body 101, 201 Casing 101A Bottom Plate 102 Movable Contact 103 Fixed Contact 104 Operating Mechanism 105, 107 Mold Bushing 106, 108 Inner Conductor 109 Bushing 110 Conductor 111 Fuse 112 Lead 113 Link Mechanism 114 Handle Operating Port 115 Operation Display Needle 200 Transformer Control unit 202 Operation power supply transformer 300 Operation power supply transformer with switch 400 SOG control device 500 Mold busbars 601 and 602 Main line side switch 700 High voltage switchgear

Claims (1)

[Scope of utility model registration request] 1. A switch installed in a high-voltage switchgear on the consumer side, wherein a movable contact connected to the main line side and a fixed contact connected to the load side are arranged in a casing, and said casing. A bushing is attached to the bottom of the switch, a switch body that can be tripped by an attached controller, a primary side conductor is connected to the fixed contact side through the bushing, and a secondary side An operating power transformer for supplying power to a controller, wherein the operating power transformer is integrally attached below the bushing.