JPH067139U - Switch with operating power transformer - Google Patents

Abstract

(57) [Summary] [Purpose] The main body of the switch and the transformer for operating power supply are integrated to facilitate the transportation and management of equipment. To reduce the work involved in switch installation work and cable connection work. [Constitution] The present invention relates to a switch 300 with a transformer for operating power supply installed in a high-voltage switchgear on the customer side. Switch body 10
0 is the movable contact 102 on the main line side and the fixed contact 1 on the load side
03 is provided inside the casing 101, the bushing 109 is attached to the bottom plate 101A of the casing 101, and a trip operation can be performed by an attached controller. The operation power supply transformer 202 has a primary side conductor connected to the fixed contact 103 side through a bushing 109, and supplies power to the controller from the secondary side. The transformer 202 is integrally attached below the bushing 109 to form the switch 300.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a switch with a transformer for operating power supply, and more specifically, a controller such as a SOG (Strage Over-current Ground relay) controller attached to a switch for an underground cable. The switch for which the transformer for operating power supply is integrally attached.

[0002]

[Prior art]

 Conventionally, a structure for mounting this type of transformer to an underground switch is described in, for example, Japanese Utility Model Publication No. 4-3465, Japanese Utility Model Publication No. 63-155238, and Japanese Patent Publication No. 63-155239. Has been done. Here, in the above-mentioned Japanese Utility Model Publication No. 4-3465, a transformer is suspended between the rising cables of the switch inside the installation foundation hole of the switch tower, and the primary side of the transformer is connected to the main circuit. Then, the structure in which the operation power source is taken from the secondary side is shown. In Japanese Utility Model Laid-Open No. 63-155238, a transformer is built in a cabinet of a switchgear, and the primary side of this transformer is connected to a molding bus connecting a main switch and a branch switch. A structure is shown in which the operation power source is taken from the secondary side of the transformer, and in the 63-155239 publication, the molded busbar and the primary side of the transformer are connected to a cable having a detachable cable head. The structure to connect with is shown.

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

[0004]

[Problems to be Solved by the Invention] Each of the above conventional techniques has 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 suspended from the bottom base of the switch tower via a suspension 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 cables to the transformer on site. Therefore, it is inconvenient to transport and manage the equipment, and it is also necessary 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. It took a lot of effort.

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. However, 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 a 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 opener and transformer are separate devices, the same problem as above is encountered.

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

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a switch installed in a high-voltage switchgear on the customer side, in which a movable contact connected to the main line side and a fixed contact connected to the load side are arranged in a casing. And a bushing is attached to the bottom of the casing, a switch body that can be tripped by an attached controller, and a primary side conductor are connected to the fixed contact side via the bushing. And a transformer for operating power supply which supplies power to the controller from the secondary side, and the transformer for operating power supply is integrally attached below the bushing.

[0008]

[Action]

 In the present invention, the switch is composed of a switch main body and an 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 the operating power supply is connected to the fixed contact side (load side) inside the switch body, and the secondary side of the transformer trips the switch in the event of a ground fault or overcurrent accident. Power is supplied to a controller such as an SOG controller that operates and opens. 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 connecting the secondary side of the transformer to the controller is exposed. Wiring is enough.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is a front view showing the external appearance of the present embodiment, and FIG. 2 is a sectional view taken along the line AA of FIG. 1. This switch 300 with a transformer for operating power supplies is a high-voltage switchgear installed in a high-voltage private customer. It is installed in the cabinet of the equipment to prevent the spread of the accident by opening the contact point by the command from the controller such as SOG controller when a ground fault accident or an overcurrent accident occurs on the load side. Is. 1 and 2, the switch 300 with a transformer for operating power supply is roughly classified into a switch main body 100 and a transformer having a transformer for operating power supply for supplying power to a controller (not shown). And a section 200.

In FIG. 2, a switch body 100 is configured 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, and an operating mechanism 104. A link 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 the 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 a bottom plate 101 A of the casing 101, and a conductor 110 and a fuse 111 are housed inside the bushing 109. The conductor 110 is connected to a fixed contact 103 side via a lead 112. Is connected to the inner conductor 108.

On the other hand, below the bushing 109, the transformer unit 200 is attached integrally with the switch body 100. This transformer unit 200 includes a transformer for operating power supply 202 inside a casing 201, and a pair of primary side conductors (not shown) of the transformer 202 respectively include the fuse 111, conductor 110, and lead 112. It is connected in advance to the two-phase internal conductors 108 via. 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, a handle operation port 114 which is a part of the operation mechanism 104 is exposed on the front surface of the switch body 100, and an operation handle attached to the operation port 114 is provided. The movable contact 102 can be manually operated by rotating the movable contact 102. 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 configuration in the 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 the responsibility demarcation point as a boundary, and the power company side circuit has a trunk line through an underground cable or the like. Also, main line side switches 601 and 602 connected to the other consumer side are installed. The switch 300 of this embodiment is connected to the switches 601 and 602 through a mold bus 500 in the customer side circuit, and is opened and closed by a command from an SOG control device 400 additionally installed. The main body 100 is made to perform a ground fault trip operation and an overcurrent accumulation trip operation.

As described above, the switch 300 has the switch main body 100 and the transformer unit 200 integrally formed, and as shown in the figure, the primary side of the transformer 202 has a fixed contact side (load side) of the switch main body 100. Power is supplied from the 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 fixed to the customer side space in the cabinet of the high-voltage switch 700 by bolts or the like.

In the above embodiment, the case where the SOG control device is used as the controller has been described, but the type of the 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]

[Effect of device]

 As described above, according to 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. It is equipped with a pressure device. Therefore, as compared with the case where the switch and the transformer are separate devices as in the related art, the devices can be easily transported and managed.

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 main body so that the wiring is not exposed outside the switch and the secondary conductor of the transformer is outside the switch. Since only the cable that connects the secondary side to the controller is sufficient, at least the primary side of the transformer eliminates the on-site cable connection work, thus reducing labor. Moreover, since the cable from the primary side of the transformer is not exposed to the outside of the switch, there is no complication of cable routing and extra length treatment. Furthermore, 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.