JPS6410089B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a gas-insulated instrument transformer (hereinafter referred to as
It is called MOF. ) related to a three-phase connection device.

As shown in FIGS. 1 and 2, a conventional MOF of this type has two sets of current transformers in a container 21 on the bottom surface of a three-phase connection device 1 that houses three-phase busbars U, V, and W. A current transformer 2 containing elements CTu and CTw,
Two or three sets of transformer elements PTu in the container 31,
It is configured by installing in series a three-phase integrated transformer 3 that accommodates PTv and PTw.

However, according to this configuration, the current transformation elements CTu,
The conductor 4v, which is not connected to any of the current transformers 2 and is not needed at all for the current transformer 2, is connected to the container 21 of the current transformer 2.
Since it penetrates the inside of the container 21, there are disadvantages such as an increase in the diameter of the container 21 and an increase in the amount of insulating gas used.

As a countermeasure for this, it is possible to reduce the diameter of the current transformer container by, for example, installing a three-phase bulk transformer on one side of the pipeline and two single-phase current transformers on the other side. This invention has been proposed separately, and the present invention provides a three-phase connection device suitable for configuring such a MOF.

That is, in this invention, three-phase busbars are arranged in a conduit so as to form the top of a triangle, and two-phase busbars connected to a current transformer attached to the conduit are arranged at the bottom of the triangle. When the remaining generatrix is the apex side of the triangle, the generatrix that is the base side is divided, and this divided part is arranged at a position opposite to the generatrix that is the apex side of the triangle, and a reciprocating conductor is formed. By configuring the divided part and the current transformer to be separably connected via the part, the structure for connecting the bus bar and the current transformer, and the installation and removal work thereof are simplified. It is something.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 7. Note that parts given the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts. Each of the three-phase bus lines U, V, and W is connected to the fourth line in the conduit 11.
As shown in the figure, a three-phase integrated transformer 3 is installed on the lower central surface of the three-phase connecting device 1 arranged and housed to form the top of a triangle, and two transformers 3 are installed on the left and right upper surfaces of the conduit 11 in the axial direction. MOF with single-phase current transformer 2 installed
Configure.

According to the present invention, when the two-phase bus lines U and W connected to the current transformer 2 are placed on the bottom side of the triangle, and the remaining bus line V is placed on the apex side of the triangle,
The generatrix lines U and W, which are on the base side, are divided, and this divided portion a is arranged at a position opposite to the generatrix line V, which is on the apex side of the triangle. Specifically, it is convenient to form the Z conductors 12, 12' in a modified Z shape and a connecting tool 13 such as a tube contact. This divided portion a and the current transformer 2 are connected via the reciprocating conductor portion 4 so as to be separable. This reciprocating conductor portion 4 includes outer conductors 42 and 4 coaxially arranged via a spacer 41 made of an insulator.
2' and inner conductors 43, 43'. They may be connected in a separable manner. In addition, in the figure, 14 is a spacer cone, and 15 is a connecting conductor that connects the transformer 3 and the bus lines U, V, and W.

With the above configuration, current transformer 2, transformer 3 or
When inspecting the MOF as a whole or in the event of an accident, container 1
1, remove the current transformer 2 and the transformer 3, and then remove the 7th
As shown in the figure, the bypass conductor 6 is used to short-circuit between the Z conductors 12 and 12' on the input and output side, and the current transformer 2,
After attaching the blind cover 7 to the part where the transformer 3 was installed, the container 11 is refilled with insulating gas, and bypass operation without the current transformer 2 and the transformer 3 is performed. Note that 16 is a shield.

According to the above configuration, the reciprocating conductor portion 4 connecting the bus bars U, W and the current transformer 2 becomes straight, and there is no need to bend the reciprocating conductor portion 4 within the conduit 11. can be simplified, and the current transformer 2
This has the effect of simplifying the work of connecting and separating the busbars U and W from each other.

[Brief explanation of the drawing]

1 and 2 show a conventional example, with FIG. 1 being a circuit diagram and FIG. 2 being a partially cut away schematic front view. 3 to 7 show an embodiment of the present invention, FIG. 3 is a partially cutaway schematic front view, FIG. 4 is a partially cutaway schematic side view, and FIG. 5 is a partially cutaway schematic side view. is an enlarged view of part a in Fig. 3, Fig. 6 is a schematic front view showing the case where the MOF is operated separately from the one in Fig. 3, and Fig. 7 is an enlarged view of part a in Fig. 6. This is an enlarged view. 1: Three-phase connection device, 11: Pipeline, 12,1
2': Z conductor with modified Z shape, 13: Connector, 2:
Current transformer, 3: Transformer, 4: Reciprocating conductor section, 41: Spacer, 42, 42': Outer conductor, 43, 43':
Inner conductor, 5: sliding contact, U, V, W: bus bar,
a: Divided part.

Claims (1)

[Claims] 1 Each three-phase busbar is arranged in the conduit so as to form the top of a triangle, and among the busbars, the two-phase busbar connected to the current transformer attached to the conduit is the bottom side of the triangle, and the remaining When the generatrix is the apex side of the triangle, the generatrix that is the base side is divided, and this divided part is arranged at a position opposite to the generatrix that is the apex side of the triangle, and the reciprocating conductor is connected to A three-phase connection device for an instrument transformer, in which the divided portion and the current transformer are connected in a separable manner.