JPH0745945Y2 - Transformer connection device for power supply and demand meters - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a connecting device for connecting a transformer for a power supply and demand instrument and a busbar in a gas-insulated switchgear.

[Prior Art] In a gas-insulated switchgear installed in a customer, a transformer for a power supply and demand instrument (MO) is installed on a bus to measure transaction power.
F) need to be connected.

An example of the gas insulated switchgear equipped with M0F is shown in FIG.
In the figure, E1 is the first element consisting of the circuit breaker CB, the disconnectors DS1 and DS2, the ground switches ES1 to ES4, the cable head CHd, the arrester LA and the voltage detector VD, and E2 is the disconnector DS.
The second element consisting of 3 and the earthing switch ES5, E3 is MO
A third element T1 including F, a bus BUS composed of a reciprocating conductor, and a connecting device C connecting the bus BUS and MOF
T2 is the first and second transformers, respectively. The arrangement of the elements of this gas-insulated switchgear is as shown in FIG. 8, for example.

MOF is, for example, as shown in FIG. 9, current transformers CT _u and CT _w for U phase and W phase, and a voltage transformer PT _{UV for} measuring the voltage between U and V phases and the voltage between V and W phases, respectively. It consists of PT _VW . The terminals of the U-phase and W-phase which are the voltage / current detection phase of the MOF are composed of K and L terminals, and the terminals of the V-phase which are the voltage detection phase are composed of one terminal.

In connecting the MOF to the gas-insulated switchgear, the V-phase, which is the voltage detection phase, may be constituted by a busbar and a connecting device for connecting the busbar to the MOF by a single conductor. Phase and W phase), it is necessary to configure the bus BUS with a reciprocating conductor and to connect the reciprocating conductor bus and the MOF with a connecting device C including a reciprocating conductor.

The structure of the connecting device C and the reciprocating conductor bus BUS used to connect the MOF in the conventional gas insulated switchgear are shown in FIGS. 10 and 11. In these figures, the subscripts K and L attached to each symbol are the K terminal of MOF and L.
It is connected to the terminal.

In FIG. 10 and FIG. 11, the bus bar BUS is composed of a reciprocating conductor consisting of an outer conductor 1L and an inner conductor 1K.
The left side and the left end of the inner conductor 1K are the circuit breakers in Fig. 7, respectively.
Connected to conductor 2 connected to CB and conductor 3 connected to disconnector DS2, respectively.

The connecting conductor 4L is connected to the middle part of the outer conductor 1L,
A cup-shaped connecting conductor 4K is further connected to 4L. The conductor 4L and the conductor 4K are insulated from each other by the spacer 6, and the inner conductor 1K is connected to the conductor 4K via the connection conductor 7.
The right end of the inner conductor 1K is connected to the terminal conductor 8 and
Is connected to a tulip-shaped contactor 9 connected to the disconnector DS3 of FIG. A spacer 10 insulates the terminal conductor 8 from the right end of the outer conductor 1L.

Tulip-shaped contacts 11 are provided on the connecting conductors 4L and 4K, respectively.
L and 11K installed, these contacts 11L and 1
One ends of the inner conductor 13L and the outer conductor 13K of the coaxial connection conductor 13 are connected to 1K, respectively.

The MOF is also provided with tulip-shaped contacts 14L and 14K connected to the L and K terminals of the transformer, and these contacts 14L and 14K are connected to the other end of the inner conductor 13L of the connecting conductor and the other end of the outer conductor 13K, respectively. Are connected.

In this example, the connecting conductors 4L and 4K and the contacts 11L and 11K
, The connecting conductor 13, and the contacts 14L and 14K
Connection device C for connecting between the power supply and demand instrument transformer
Is configured.

[Problems to be Solved by the Invention] A conventional connecting device C includes a coaxial connecting conductor 13 in which an inner conductor 13L and an outer conductor 13K are concentrically arranged, and tulip-shaped contacts 11L, 11K, 14L and 14K. Inner conductor 13L
Since the outer conductor 13K and the outer conductor 13K are connected to the corresponding tulip-shaped contacts at positions displaced in the axial direction, there is a problem that the tolerance of the connection conductor 13 to the inclination is extremely small.
Therefore, there has been a problem that it is necessary to increase the processing accuracy of each part, labor is required for assembling, and many expensive tulip-shaped contacts are required.

The object of the present invention is to connect a bus bar composed of a reciprocating conductor and a transformer for electric power supply and demand with a simple structure, without using a coaxial connecting conductor and a tulip-shaped contactor. An object of the present invention is to provide a connecting device for an instrument transformer.

[Means for Solving the Problems] In the present invention, one end is connected to each of the reciprocating conductors forming a busbar, and the other end has a flat plate portion arranged so that the plate surfaces face each other. A pair of bus-side terminal plates arranged so that the parts extend parallel to the transformer side, and a flat plate part that is connected to the transformer at one end and is arranged so that the plate surfaces face each other on the other end side. A pair of transformer-side terminal plates arranged so that the flat plate portion extends in parallel with the flat plate portion of the bus bar side terminal plate toward the bus bar side terminal plate side, with the plate surfaces facing each other. And a pair of plate-shaped connecting conductors that are arranged so as to straddle between the flat plate portion of the bus bar side terminal plate and the flat plate portion of the pair of transformer side terminal plates.

The pair of plate-shaped connecting conductors has a busbar-side contact portion and a transformer-side contact portion, which are formed so as to form an arcuate cross section, at one end and the other end, respectively. Also, the curved surface on the convex side of the transformer side contact portion is brought into contact with the corresponding flat plate portion of the bus bar side terminal plate and the corresponding flat plate portion of the transformer side terminal plate.

Then, one end of the pair of plate-shaped connecting conductors is fastened by a busbar-side bolt that penetrates the busbar-side contact portion and the flat plate portion of the pair of busbar-side terminal plates through an insulating tube, and The other end is fastened with a transformer-side bolt that penetrates the transformer-side contact portion and the flat plate portion of the pair of transformer-side terminal plates through an insulating cylinder, and the pair of plate-shaped connecting conductors are connected to the bus-side bolt and the transformer. It is configured to be rotatable about the side bolts with respect to the bus bar side terminal plate and the transformer side terminal plate.

[Operation] As described above, the pair of plate-shaped connection conductors are arranged so as to straddle between the flat plate portion of the pair of bus bar side terminal plates and the flat plate portion of the pair of transformer side terminal plates. The curved surfaces of the busbar-side contact portion and the transformer-side contact portion, which have arcuate cross-sections provided at one end and the other end, respectively, are brought into contact with the busbar-side terminal plate and the flat plate portion of the transformer-side terminal plate, and the busbar-side contact of the plate-shaped connecting conductor Part and the flat plate part of the bus bar side terminal plate, and the transformer side contact part and the flat plate part of the transformer side terminal plate by bolts that penetrate one end and the other end of the plate-like connecting conductor, respectively. If the structure is such that it is fastened to the flat plate part of the transformer-side terminal plate, good electrical connection is maintained between the plate-shaped connection conductor and the bus-side terminal plate, and between the plate-shaped connection conductor and the transformer-side terminal plate. It is possible to allow relative rotation between the plate-shaped connecting conductor and each terminal plate in the state where it is left as it is. Wear. Further, since the plate-shaped connecting conductor and each terminal plate have elasticity, even if a pair of plate-shaped connecting conductors are inclined along a plane perpendicular to each plate surface, the curved surface of the contact portion having an arcuate cross-section is used for each terminal plate. It is possible to maintain the electrical connection state between the plate-shaped connecting conductor and each terminal plate in a good state by keeping it in contact with the flat plate portion.

Therefore, even if the connection conductor is considerably inclined, the electrical connection between the connection conductor and each terminal plate can be maintained in a good state,
Compared to the case where tulip contacts are used, the tolerance for the inclination of the connecting conductor can be increased.

As described above, according to the present invention, since the tolerance for the inclination of the connecting conductor can be increased, it is not necessary to increase the processing accuracy of each part as in the conventional case. Further, since high precision is not required at the time of assembling, troublesome adjustment can be omitted and the assembling can be simplified. Further, since the tulip-shaped contactor is not used, the labor required for processing and assembling can be reduced, and the cost can be reduced.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 6 show an embodiment of the present invention. In this embodiment, the present invention is applied to a connecting portion of a transformer for a power supply and demand instrument of a gas insulated switchgear having the configuration shown in FIGS. 7 and 8, and FIG. The configuration is shown.

In FIG. 4, reference numeral 20 denotes a cylindrical container, which has branch pipe portions 20a and 20b on its side surface, and the lower end thereof is connected to a container 21 of a power supply / demand instrument transformer (MOF). The branch pipe portion 20a of the container 20 is connected to the container 24 of the element E1 via the flexible pipe 22 and the insulating spacer 23, and the branch pipe portion 20b is connected to the flexible pipe 2
It is connected to the container 27 of the element E2 via 5 and the insulating spacer 26.

Buses BUS and BUS 'are housed in the flexible tubes 22 and 25, respectively, and a connecting device C for connecting the busses BUS and BUS' to the MOF is housed in the container 20.

Among the three-phase bus conductors 28u to 28w (28w is hidden behind 28u in FIG. 4) that form the bus BUS, the U-phase and W-phase conductors 28u and 28w, which are the voltage / current detection phases of the MOF. Is a coaxial reciprocating conductor in which an inner conductor and an outer conductor are concentrically arranged, and the V-phase conductor 28v, which is a voltage detection phase, is a single conductor.

One ends of the outer conductors and inner conductors of the bus conductors 28u, 28w are connected to the breaker CB and the disconnector DS2 in the element E1 through the through conductor (comprising a reciprocating conductor) of the insulating spacer 23, and the outsides of these conductors 28u, 28w. The other end of the conductor is connected to intermediate conductors 31u and 31w supported to the container 20 via insulating supports 30u and 30w.

Further, one end of the conductor 28v is connected to the breaker CB and the disconnector DS2 in the element E1 through the penetrating conductor of the insulating spacer 23, and the other end of the conductor 28v is supported by the insulating support 30v with respect to the container 20.

Three-phase bus conductors 28u 'to 28w' constituting bus BUS '
(In FIG. 4, the conductor 28w 'is hidden behind 28u'.) Consists of a single conductor, and one end of these conductors is connected to the disconnector DS3 in the element E2 via the through conductor of the insulating spacer 26. It is connected. The other ends of the conductors 28u ′ and 28w ′ are connected to the inner conductors of the conductors 28u and 28w of the bus BUS,
The other end of the conductor 28v 'is supported by an insulating support 30v'.

The detailed structure of the connecting device for connecting the bus lines BUS and BUS 'to the power supply and demand meter transformer MOF is shown in FIGS. 1 to 3.

FIG. 3 shows a device for connecting the V-phase bus conductors 28v and 28v 'to the MOF. This connecting device connects a conductor 31v connecting the conductors 28v and 28v' and an intermediate portion of the conductor 31v. MOF V
And a conductor 34 connected to the phase terminal 33.

The connection device C according to the present invention is a U-phase and W-phase bus conductor.
28u and 28w are connected to the MOF, and an example of the configuration is shown in FIGS. 1 and 2 taking the U phase as an example.

1 and 2, the busbar conductor 28u is composed of a reciprocating conductor composed of an outer conductor 28L and an inner conductor 28K arranged concentrically with each other, and these conductors are mutually positioned by a pin 36 made of an insulating material. ing.

The end of the outer conductor 28L of the busbar conductor 28u ends at a position before the intermediate conductor 31u, and the inner conductor 28K is inserted into a recess 31ul (see FIG. 2) formed in the intermediate conductor 31u.
A bus bar side terminal plate 37 made of a flat plate is connected to an end portion of the outer conductor 28L, and a bus bar side terminal plate 38 made of a flat plate is connected to an end portion of the inner conductor 28K. The end of the busbar conductor 28u 'terminates at a position before the intermediate conductor 31u, and the busbar conductor 28u'
A connecting plate 39 is connected to the end of the.

As shown in FIG. 2, the bus bar side terminal plate 37 has a flat plate portion 37a extending to the MOF side, a rising portion 37b projecting upward from a position biased to one end side in the width direction of the flat plate portion 37a, and a rising portion. 3
Intermediate part 3 bent at a right angle from the tip of 7b to the bus conductor 28u side
7c and a folded-back portion 37d folded back from the tip of the intermediate portion 37c to the flat plate portion 37a side. The intermediate portion 37c of the bus bar side terminal plate 37 is bolted to the intermediate conductor 31u, and the folded portion 37d
Is bolted to the outer conductor 28L.

Further, the bus bar side terminal plate 38 includes a flat plate portion 38a arranged to face the flat plate portion 37a of the terminal plate 37, a narrow rising portion 38b protruding upward from the upper end central portion of the flat plate portion 38a, and this rising portion 38b.
It has a bent portion 38c which is bent at a right angle from the tip end (see FIG. 2) to the bus conductor 28u 'side. The bent portion 38c of the busbar-side terminal plate 38 is bolted to the end of the inner conductor 28K in the recess 31ul of the intermediate conductor 31.

The connection plate 39 is a flat plate portion 39a arranged in parallel with the flat plate portion 37a of the terminal plate 37, a rising portion 39b rising upward from a position biased to one end side in the width direction of the flat plate portion 39a, Rising section 3
It is composed of a bent portion 39c bent from the upper end of 9b to the bus conductor 28u side at a right angle. The flat plate portion 39a of the connecting plate 39 is bolted to the busbar conductor 28u ', and the bent portion 39c is an intermediate conductor.
It is bolted to 31u.

Terminals 41K and 41L connected to the K terminal and L terminal of the transformer through the coaxial conductor 40 are provided at the upper end of the MOF, and the lower ends of the transformer side terminal plates 42 and 43 are bolted to these terminals 41K and 41L, respectively. There is. The transformer side terminal plates 42 and 43 have flat plate portions 42a and 43a extending in parallel to each other toward the bus bar side, and these flat plate portions 42a and 43a and the bus bar side terminal plate 37.
The size, shape, and mounting position of each terminal plate are set so that the flat plate portions 37a and 38a of the terminal plates 38 and 38 are aligned with each other.

Between the flat plate portions 37a, 38a of the pair of bus bar side terminal plates 37, 38 and the flat plate portions 42a, 43a of the pair of transformer side terminal plates 42, 43, there are paired plate-shaped connecting conductors 45 and 46, respectively. It is arranged.

As shown in FIG. 6, the plate-shaped connecting conductors 45 and 46 have bus-side contact portions 45a, 46a and transformer-side contact portions 45b, 46b formed in an arc shape at both ends, and each contact portion has Has two parallel splits S and S. The bus-side terminal plates 37, 38 and the flat-plate portions 37a of the transformer-side terminal plates 42, 43 to which the curved surfaces on the convex side of the bus-side contact portions and the transformer-side contact portions at both ends of the plate-like connecting conductors 45, 46 correspond, respectively. , 38a and 42a, 43a are contacted from the outside.

A spacer 47 made of an insulating material is arranged between the flat plate portions 37a and 38a of the bus bar side terminal plates 37 and 38, and the contact portion 45a of the connection conductor 45 is arranged.
A seat plate 48 made of an insulating material is applied to the outside of the. Seat plate 48, contact portion 45a of connection conductor 45, flat plate portion 37a of terminal plate 37, spacer 47, flat plate portion 38a of terminal plate 38, and connection conductor
Insulation cylinders are provided in the holes that penetrate the 46 contact points.
49 is fitted and the busbar side bolt 50 is passed through the insulating cylinder 49. Then, nuts provided on the fasteners 51 and 52 are screwed onto both ends of the busbar side bolt 50 protruding from the insulating cylinder 49, and by tightening these fasteners, the contact portions 45a and 46a of the connection conductors 45 and 46 are connected. Bus-side terminal plate 37 and
The flat plate portions 37a and 38a of 38 are fastened. Spacer 4
7. The insulating cylinder 49 and the seat plate 48 insulate the terminal plates 37, 38 and the connection conductors 45, 46 from each other.

Similarly, a spacer 55 made of an insulating material is arranged between the flat plate portions 42a, 43a of the transformer-side terminal plates 42, 43, and a seat plate 56 made of an insulating material is applied to the outside of the contact portion 45b of the connection conductor 45. It has been damaged. Seat plate 56, contact part 45b of connection conductor 45, terminal plate 4
The insulating cylinder 57 is fitted into the holes provided through the flat plate portion 42a, the spacer 55 of the second terminal plate 43, the flat plate portion 43a of the terminal plate 43, and the contact portion 46b of the connecting conductor 46, and the insulating cylinder 57 is connected to the transformer side. Bolt 58 is inserted. Nuts provided on the fasteners 61 and 62 are screwed onto both ends of the transformer-side bolt 58 protruding from the insulating cylinder 57, and by tightening these fasteners, the contact portions 45b and 46b of the connecting conductors 45 and 46 are connected. The flat plate portions 42a and 43a of the line-side terminal plates 42 and 43 are fastened.

In this embodiment, the U-phase energization path is the outer conductor 28L →
Bus-side terminal board 37 → connecting conductor 45 → transformer-side terminal board 42 → MOF
→ Transformer side terminal plate 43 → Connection conductor 46 → Bus side terminal plate 38 → Inner conductor 28K.

The W-phase connecting device is also constructed in exactly the same manner as described above.

When the both ends of the plate-shaped connecting conductors 45 and 46 are fastened with the one busbar side bolt 50 and the transformer side bolt 58 as in the above embodiment, each connecting conductor is centered around the bolts 50 and 58. It can be rotated. In addition, plate-shaped connecting conductor
Since 45 and 46 are placed with the curved surfaces on the convex side of the contact points with arcuate cross-sections at both ends abutting against the flat plate part of the terminal plate, these plate-like connecting conductors are perpendicular to the plate surface. The electrical connection between both connection conductors and the terminal plate can be maintained well even if they are inclined to some extent along a flat plane. Therefore, when assembled, the electrical contact between the plate-shaped connecting conductors 45, 46 and the busbar side and transformer side terminal plates 37, 38 and 45, 46 is secured even if they are slightly displaced from their proper positions. Therefore, the position adjustment at the time of assembly can be omitted.

[Effect of the Invention] As described above, according to the present invention, the busbar side and the transformer side contact portion having an arcuate cross section are provided at both ends of the plate-like connecting conductor, and the curved surface on the convex side of both contact portions is connected to the busbar side terminal. Plate and the flat plate part of the transformer side terminal plate respectively, and both contact parts are fastened to the bus bar side terminal plate and the transformer side terminal plate by bolts so that the plate-shaped connecting conductors become the bus bar side terminal plate and the transformer side. Since it can be rotated with respect to the terminal plate, even if the plate-shaped connection conductor is considerably inclined, the electrical connection state between the connection conductor and each terminal plate can be kept good, and the connection conductor It is possible to increase the margin with respect to the inclination.

Therefore, it is not necessary to make the processing precision of each part higher than in the conventional case, and since adjustment is not required at the time of assembly, it is possible to reduce the labor required for processing and assembly. Further, since the tulip-shaped contactor is not used, there is an advantage that the labor required for processing and assembling can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing a partial cross-section of a U-phase connecting device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a front view showing a V-phase connecting device in FIG. 4, FIG. 4 is a sectional view showing an essential part of an embodiment of the present invention, FIG. 5 is a sectional view taken along the line VV of FIG. 4, and FIG. FIG. 7 is a perspective view of a connection conductor used in an embodiment of the invention, FIG. 7 is a single wire connection diagram showing an example of a gas insulated switchgear to which the connection device of the invention is applied, and FIG. 8 is a gas insulated switchgear having the configuration of FIG. FIG. 9 is a plan view showing an example of the arrangement of the elements of the device, FIG. 9 is a connection diagram showing the configuration of a transformer for a power supply and demand meter, FIG. 10 is a sectional view showing a conventional connection device, and FIG. 11 is FIG. FIG. 11 is a sectional view taken along line XI-XI of FIG. 28u …… Bus conductor, 28L …… Outer conductor, 28K …… Inner conductor, 37,38 …… Twin bus side terminal plate, 42,43 …… Transformer side terminal plate, 45,46 …… Connecting conductor, 45a , 45b and 46a, 46b ... Contact part, MOF ... Transformer for power supply and demand.

Claims (1)

[Scope of utility model registration request] 1. A connecting device for connecting a busbar made of a reciprocating conductor and a transformer for a power supply and demand instrument, wherein one ends are respectively connected to the reciprocating conductors constituting the busbar so that plate surfaces face each other. A pair of bus bar side terminal plates having flat plate portions arranged at the other end side and arranged so that the flat plate portions extend parallel to the transformer side; and one end connected to the transformer, The flat plate portion is disposed at the other end side so that the surfaces are opposed to each other, and the flat plate portion is arranged so as to extend in parallel to the flat plate portion of the bus bar side terminal plate toward the bus bar side terminal plate side. The pair of transformer-side terminal plates and the pair of transformer-side terminal plates that are placed across the flat plate portion of the busbar-side terminal plate of the pair and the flat plate portion of the pair of transformer-side terminal plates with the plate surfaces facing each other. A pair of plate-shaped connection conductors, and the pair of plate-shaped connection conductors are mother members formed to have an arc-shaped cross section. A bus-side terminal that has a wire-side contact portion and a transformer-side contact portion at each one end and the other end, and the curved surface on the convex side of the bus-side contact portion and the transformer-side contact portion of each plate-shaped connecting conductor corresponds to the bus-side terminal. The flat plate portion of the plate and the flat plate portion of the transformer-side terminal plate are brought into contact with each other, and one end of the pair of plate-shaped connecting conductors connects the bus bar-side contact portion and the flat plate portion of the pair of bus-side terminal plates through an insulating tube. A transformer that is fastened by a penetrating busbar-side bolt and has the other end of the pair of plate-shaped connecting conductors penetrating the transformer-side contact portion and the flat plate portion of the pair of transformer-side terminal plates through an insulating cylinder. The pair of plate-shaped connecting conductors are fastened by side bolts so that the pair of plate-shaped connecting conductors can rotate with respect to the busbar-side bolt and the transformer-side bolt with respect to the busbar-side terminal plate and the transformer-side terminal plate. A connecting device for a transformer for a power supply and demand meter, characterized by: