JP2635700B2 - Gas-insulated transformer panel for receiving power - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial application field) The present invention relates to a power-receiving gas-insulated transformer board in which a power-receiving transformer is housed in a box in which insulating gas is sealed.

(Prior Art) In FIG. 4 showing an example of a conventional two-line power receiving system, a disconnector 23 is connected via a circuit breaker 22 to a load side of a disconnector 21 connected to a power supply of another system (not shown). The load side of the disconnector 23 is connected to each other, branched into two lines via a transaction transformer (hereinafter, referred to as PCT) 1, and connected to a switch 3 such as a vacuum circuit breaker or a blade switch. It is connected to a power receiving transformer 2 in which a sulfur hexafluoride gas (hereinafter, referred to as an insulating gas) is sealed via a flow device 4.

Depending on the power receiving equipment, for example, as shown in FIG. 5, a cable connection box 6 is mounted on the upper side of the transformer panel 2 connected to the PCT panel 1a containing the PCT 1 and opened and closed in the cable connection box 6. There is a case where a current transformer 3 and a current transformer 4 are stored.

When the installed capacity increases, the switch 3 and the current transformer 4 are connected to the primary transformer panels 8A and 8B adjacent to the PCT panel 1a as shown in FIG.
Some are connected to power receiving transformer panels 2A and 2B via cables 5 via cable connection boxes 6, respectively.

(Problems to be Solved by the Invention) However, in the power receiving equipment having such a configuration, the switchboard panels 8A and 8B in which the power receiving transformer panels 2A and 2B and the switch 3 are stored.
Is miniaturized by filling with insulating gas,
Although a service for inspection is also planned, since the number of boxes does not decrease,
The installation floor area does not decrease for the volume reduction.

Further, the reliability of the gas seal is reduced due to the large number of gas compartments.

Therefore, an object of the present invention is to further reduce the installation floor area,
An object of the present invention is to obtain a power receiving gas-insulated transformer panel that can increase the reliability of a gas seal.

[Configuration of the Invention] (Means and Actions for Solving the Problems) According to the present invention, at least a cooler that cools an insulating gas sealed therein and discharges the same through an opening in a ceiling is mounted on the ceiling and at least A plurality of boxes that are installed adjacent to one side, a power receiving transformer housed in the box, and one side connected to the outside via a connection portion provided on one side of the box, A switch that is penetrated through the outer wall on the other side and has one side of the switching unit connected to the other side of the power receiving transformer, and the other side of the switching unit of a plurality of boxes that is disposed above and above the switching unit of the switch. This is a power receiving gas-insulated transformer panel that has a common bus that connects between them, thereby reducing the installation area of the power receiving equipment and increasing the reliability of the gas seal.

(Embodiment) An embodiment of a gas-insulated transformer panel for receiving power of the present invention will be described below with reference to FIG.

FIG. 1 is a side sectional view of a gas-insulated transformer panel 14 for power reception according to the present invention. In the front part (left part in the drawing) of a box 9 having an airtight structure, a ceiling plate 9d extends over the entire width of the box 9. The power receiving transformer 2 is housed in the rear of the partition 9a.

Further, a case 9b, which is convex when viewed from the side, is hermetically attached to the front wall in front of the power receiving transformer 2 from the front,
A vacuum circuit breaker as a switch 3 composed of an upper primary terminal 3a, an intermediate opening / closing section 3b, a lower secondary terminal 3c, and an operation mechanism 3d is attached to the rear surface of the case 9b.

In front of the upper end of the power receiving transformer 2, a bus bar 7 connected to a connection bushing (not shown) hermetically attached to a side plate of the box 9 hermetically seals the box 9 left and right (in a direction orthogonal to the paper surface). A conductor 10 penetrating through the busbar 7 and branching downward from the bus 7 is connected to the rear end of the primary terminal 3a.

Under the secondary terminal 3c, two through-type current transformers 4 are attached, and the conductor 11 having one end connected to the rear end of the secondary-side terminal 3c is connected to the through-type current transformer 4 And is bent upward at the rear portion to be connected to a primary terminal 2a provided on the front side of the power receiving transformer 2. A secondary conductor (not shown) of the power receiving transformer 2 is connected to a connection box on the back of the box 9. From 9c, it is installed in a cable pit (not shown) provided on the floor.

The ceiling plate 9d of the box 9 is provided at the rear thereof with an exhaust port 13A for discharging the insulating gas warmed by the power receiving transformer 2 upward. The exhaust port 13A is provided on the upper surface of the ceiling plate 9d. One end of the attached cooler 12 is connected, and the other end of the cooler 12 is connected to an intake port 13B provided at a front portion of the ceiling plate 9d.

According to the power receiving gas-insulated transformer board 14 having such a configuration, the two-line power receiving equipment shown in the single-line diagram of FIG.
As shown in the layout diagram in the figure, the power receiving gas-insulated transformer panel 14 is arranged adjacent to the right side of the PCT panel on the right side of the power receiving circuit breaker panel 15 on the left side to reduce the installation floor area of the power receiving equipment. Can be reduced.

Further, since the conventional cable connection box 6 is not required, the number of gas compartments is reduced, and the reliability of the gas seal can be improved.

In the above embodiment, the switch 3 is a vacuum circuit breaker,
Although the partition 9a is provided only at the upper portion, as shown in FIG. 3, if the inside of the box 9 is completely partitioned by the partition wall 9e, the switch 3 is used as a blade-shaped starter to cut off the excitation current of the power receiving transformer 2. The connection between the power receiving transformer 2 and the conductor 11 is made by a bushing provided on the partition wall 9e.
16 may be performed. And in this case, the cooler 12
It is sufficient to cool only the transformer room side, which is higher in temperature, on the rear side of the partition wall 9e (note: the temperature rise in the switch room is low).

In this case, even if the insulating gas is deteriorated due to generation of an arc due to opening and closing, the power receiving transformer 2 is not affected, and thus there is an advantage that the selection of the insulating material such as the transformer is easy.

Furthermore, the connection between the switch 3 and the conductors 10 and 11 may be of a clip-in type, and may be detachable from the front together with the case 9b. Thereby, there is an advantage that maintenance and inspection of the switch 3 are further facilitated.

[Effects of the Invention] As described above, according to the power receiving gas insulating transformer panel housing the power receiving transformer of the present invention, the rear surface of the front wall of the power receiving transformer housed in the box in which the insulating gas is sealed is provided. Since a switch and current transformer connected to the primary side of this power receiving transformer are installed, a power receiving gas insulated transformer board that can reduce the installation area of the power receiving equipment and increase the reliability of the gas seal is provided. Obtainable.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of a power receiving gas-insulated transformer panel accommodating the power receiving transformer of the present invention, and FIG. 2 is an explanatory view showing an arrangement of the power receiving gas-insulated transformer panel of the present invention. FIG. 3, FIG. 3 is a side sectional view showing another embodiment of the gas-insulated transformer board for receiving power of the present invention, FIG. 4 is a single-line connection diagram showing this type of two-circuit power receiving equipment, and FIGS. FIG. 2 is a diagram showing a configuration and an arrangement of a power receiving gas-insulated transformer panel accommodating a conventional power receiving transformer. 2… Transformer for power receiving, 3… Switch 7 …… Bus, 9… Box 9a …… Partition, 9b …… Case

Claims (1)

(57) [Claims] 1. A plurality of boxes, each of which is provided with a cooler for cooling an insulating gas sealed therein and discharging the same through an opening in a ceiling, and which is mounted on the ceiling and has at least one side adjacent thereto. A power receiving transformer that is housed in a box, and one side of which is connected to the outside through a connection portion provided on one side of the box, and the power receiving transformer that is provided through the outer wall on the other side of the box and A switch to which one side of the switch is connected to the other side, and a switch disposed laterally above the switch of the switch and connected to an upper pole of the switch and connected to the other side of the switch of the plurality of boxes. A power receiving gas-insulated transformer panel having a common bus to be connected.