JPH0946828A - Transformer unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an installation space and simplify an installation work. SOLUTION: A unit is provided with a case for transformer 22 wherein a transformer is housed, a case for switchgear installed above the case for transformer 22 through a bushing 26, a load switch which is installed in the case for switchgear 25 and which is connected to the primary side of the transformer, a plurality of breakers for wiring 20 which are parallelly installed in the case for switchgear 25 and which are connected to the secondary side of the transformer, and a measuring and controlling equipment 14 which is so installed that it can get in or out of the case for switchgear 25 freely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer unit for low-voltage power distribution equipment which is distributed and arranged in the vicinity of a plurality of loads in buildings, factories and the like.

[0002]

2. Description of the Related Art A conventional transformer unit will be described with reference to FIG. 9 which is a front view and FIG. 10 which is a circuit diagram. In these drawings, reference numeral 1 is a transformer housing, in which a transformer 2, a load switch 3, a current transformer 4, and a zero-phase current transformer 5 are housed. 6 is a door that closes the front opening of the storage board 1, 7 is an intake ventilation hole formed in the lower portion of the door 6, 8 is an ammeter changeover switch provided in the center of the door 6, and 9 is this switch 8
It is a viewing window on the left side of the room for viewing the thermometer of the transformer 2.

Reference numeral 10 indicates two ground fault detectors arranged in parallel above the switch 8 for detecting a ground fault on the low voltage side, and reference numeral 11 indicates a collective fault indicator provided above both detectors 10 for indicating a fault. , 12 is an ammeter that is provided above the indicator 11 to measure the current on the low voltage side, and 13 is a signal lamp that is provided above the ammeter 12, and a voltage is applied to the secondary side of the transformer 2. Is displayed. 14 is a switch 8, a detector 10, an indicator 11, an ammeter 12, and a signal lamp 1.
It is a measurement and control instrument consisting of 3 etc.

Reference numeral 15 denotes a ventilation box provided on the top plate of the storage board 1 and having an exhaust ventilation hole 16 formed therein.
The outside air taken in from the outside is exhausted to the outside from the exhaust ventilation hole 16 by natural convection to prevent the temperature inside the storage board 1 from rising.

Reference numeral 17 denotes a transformer primary side cable lead-in board provided adjacently to the left side of the storage board 1 and has a primary side cable 18 drawn therein. Reference numeral 19 denotes a transformer secondary-side branch wiring circuit breaker panel provided adjacently to the right side of the storage panel 1, and four wiring circuit breakers 20 are provided therein.

[0006]

In the case of the conventional transformer unit, the transformer 2 and the devices on the primary side and the secondary side of the transformer 2 are housed in the respective boards 1, 17, 19 which are independent of each other. Therefore, there is a problem that a large installation space is required and the installation work becomes large.

The present invention has been made in consideration of the above points, and an object thereof is to provide a transformer unit capable of reducing the installation space and simplifying the installation work.

[0008]

In order to solve the above-mentioned problems, a transformer unit of the present invention is provided with a switchgear casing via a bushing on the upper portion of a transformer casing accommodating a transformer, A load switch and a plurality of circuit breakers are provided in the switchgear housing, and a measurement / control instrument is installed in the switchgear housing so that the switchgear can freely move in and out. Therefore,
Since only the transformer housing needs to be installed, the installation space is reduced and the installation work is simplified.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Regarding one embodiment, first, a front view,
Description will be made with reference to FIG. 1 showing a right side view and FIG. 2 showing a plan view of FIG. 1A and FIG. 8 showing a circuit diagram. In these drawings, the same reference numerals as those in FIGS. 9 and 10 indicate the same or corresponding ones, and the different points are as follows.

Reference numeral 21 is a base, 22 is a transformer casing installed on the base 21 through a support 23, and the transformer 2
Is stored. Reference numeral 24 is a thermometer of the transformer 2 provided on the upper right side of the front surface of the transformer housing 22, and 25 is a switchgear provided on the upper portion of the transformer housing 22 through both primary and secondary bushings 26. The front side board 28 is located on the front side of the mounting angle 27 in the case 25, and the rear side board 29 is located on the rear side.

Next, the rear panel 29 will be described with reference to FIG. 5, which is a schematic right side view. 30 is a door that closes the rear opening of the rear side panel 29, and 31 and 32 are both bushings 26.
The primary side terminal and the secondary side terminal of the transformer, which are respectively derived from the reference numerals 33 and 33, are support plates provided in parallel with each other above and below the substantially central portion of the rear side panel 29, on which the load switch 3 is installed There is.

Reference numeral 34 is a fuse provided in the load switch 3, 35 is an arc extinguishing chamber of the load switch 3, 36 is a plurality of cable connectors penetrating the top plate of the rear panel 29, and
The secondary cable 18 is drawn into the rear panel 29 via the connector 36, connected to one end of the load switch 3, and the other end of the load switch 3 is connected to the primary terminal 31 of the transformer 2. There is.

Next, the front panel 28 will be described with reference to FIGS.
This will be described with reference to FIG. 5 and FIG. 3 showing a front view of the switchgear housing 25, and FIG. 4 showing a front view of the switchgear housing 25 with the front portion removed. Reference numeral 37 denotes a terminal box mounted on the front portion of the lower surface of the front panel 28, which transmits / receives data to / from a central monitoring panel (not shown). Reference numeral 38 denotes a storage box which is provided in a lower opening 39 on the front surface of the front panel 28 so as to be able to move in and out and has an upper surface opened. The measurement / control device 14 is provided on the front surface of the storage box 38, and two in order from the right side. The ground fault detector 10, the collective fault indicator 11, the ammeter changeover switch 8, the ammeter 12, and the signal lamp 13 are arranged, and two zero-phase current transformers 5 are provided at the rear of the lower opening 39. .

Reference numeral 40 denotes handles fixed to both sides of the front surface of the storage box 38, 41 denotes five rectangular rectangular holes formed on the front plate of the front panel 28 at equal intervals, and 42 denotes upper and lower portions in the front panel 28. Mounting brackets provided in parallel with each other.
The four circuit breakers 20 for wiring are attached in this order from the left side, the circuit breakers 20 for wiring are positioned behind the respective square holes 41, and the operation levers 43 of the respective circuit breakers 20 are loosely inserted in the respective square holes 41. The square hole 41 at the right end is closed by a lid.

Reference numeral 44 is a connecting bus bar unit, and as shown in FIG. 6, a first connecting bus bar 45, a second connecting bus bar 46,
The third connecting bus bar 47 includes the first connecting bus bar 45.
Is, as shown in FIG.
It consists of one vertical connection conductor 49 and one front-back measurement conductor 50.

Reference numeral 51 is a U-shaped mounting portion formed on the upper portion of the connecting conductor 49, and 52 is a circuit breaker connecting portion formed by bending the lower portion of the connecting conductor 49 forward.
1, the connection conductor 49 is positioned on the connection conductor 48 by the two rivets 53 penetrating the connection conductor 48, the five connection conductors 49 are mounted on the front surface of the connection conductor 48 at equal intervals, and both sides of the mounting portion 51 are connected. By brazing the edges,
It has a reliable electrical connection.

Reference numeral 54 denotes a temporary cable connecting portion at the upper end of the connecting conductor 49 at the right end, which projects from the upper edge of the connecting conductor 48 and is connected to the temporary cable. Reference numeral 55 denotes a bent base portion of the measurement conductor 50, which is attached to the back surface between the adjacent connection conductors 49 on the left side of the connection conductor 48 by a rivet 53,
The measuring portion 56 is located rearward, and the base portion 55 is brazed to the connecting conductor 48.

The second connecting bus bar 46 has substantially the same structure as the first connecting bus bar 45, but each connecting conductor 49.
Is shifted to the right from the position of the connection conductor 49 of the first connection bus 45, the length below is short, and the temporary cable connection portion 54 of the connection conductor 49 at the right end is long.

Next, in the third connecting bus bar 47, the positions of the connecting conductors 49 are further shifted to the right and the length below is shorter than in the case of the second connecting bus bar 46, and the connecting conductor 49 at the right end is shorter. The temporary cable connecting portion 54 is further elongated.

Then, as shown in FIG. 6, the second and third connection buses 46 and 47 are arranged in order behind the first connection bus 45 at predetermined intervals, and the second and third connection buses 46 and 47 are arranged. Three
The connecting conductors 48 of the connecting busbars 46 and 47 are sequentially positioned downward, the wiring circuit breaker connecting portions 52 of the connecting conductors 49 of the connecting busbars 45, 46 and 47 are set at the same height, and the temporary cable connecting portions 54 are formed. With the same height, and the connection bus bar unit 44 is formed.

A connection busbar unit 44 is provided behind each of the circuit breakers 20 for wiring, and the current is transformed into the measurement portions 56 of the measurement conductors 50 of the first and third connection busbars 45 and 47 of the connection busbar unit 44, respectively. The measuring device 56 is provided with the measuring device 56.
Is connected to the secondary side terminal 32 of the transformer 2 via the flexible terminal 57, and the wiring breaker connecting portion 52 of each connection conductor 49 is connected to one end of the wiring breaker 20.

Reference numeral 58 denotes an opening formed in the front portion of the top plate of the front panel 28 in the left-right direction, which is closed by a cover plate (not shown) and is connected to the other end of the circuit breaker 20 for the low voltage. The circuit cable 59 is inserted through the through hole of the cover plate and is drawn out to the outside. Reference numeral 60 is a ground wire / control cable board provided on the left side of the front board 28, and 61 is an opening formed in a top board of the cable board 60, which is closed by a cover plate (not shown) and is shown in FIG. The chain ground wire 62 and the solid control cable 63 are inserted into the through holes of the cover plate, drawn through the cable board 60 and into the front panel 28, and the ground wire 62 is grounded via the zero-phase current transformer 5. A control cable 63 is wired to each device 8, 10, 11, 12, 13 of the measurement / control instrument 14.

Since the conductors 48, 49, 50 are brazed to the connecting bus bar unit 44, it is not necessary to perform maintenance and inspection, and the maintenance and inspection portion can be reduced.

Further, since the switchgear casing 25 is provided above the transformer casing 22, the transformer casing 22 is provided.
Only need to install.

[0025]

The present invention has the following effects. In the transformer unit of the present invention, a switch gear casing 25 is provided above a transformer casing 22 in which the transformer 2 is housed via a bushing 26, and the load switch 3 is provided in the switch gear casing 25. A plurality of circuit breakers 20 for wiring are provided so that the measurement / control instrument 14 can be freely moved in and out of the switch gear casing 25.
Since only the transformer housing 22 is installed, the installation space can be reduced and the installation work can be simplified.

[Brief description of drawings]

FIG. 1A is a front view of one embodiment of the present invention, and B is a right side view.

FIG. 2 is a plan view of FIG. 1A.

3 is a front view of the switchgear housing of FIG. 1A. FIG.

FIG. 4 is a front view with the front portion of FIG. 3 removed.

5 is a schematic right side view of the switchgear housing of FIG. 1B. FIG.

6 is a front view of the connection bus bar unit of FIG. 4. FIG.

7 is a front view of the connecting bus bar of FIG. 6, B is a right side view,
C is a bottom view.

FIG. 8 is a circuit diagram of FIG.

FIG. 9 is a front view of a conventional example.

FIG. 10 is a circuit diagram of FIG. 9.

[Explanation of symbols]

 2 Transformer 3 Load switch 14 Measurement / control equipment 20 Wiring circuit breaker 22 Transformer casing 25 Switchgear casing 26 Bushing

Claims (1)

[Claims] 1. A transformer casing housing a transformer, a switchgear casing provided on an upper part of the transformer casing via a bushing, and a switchgear casing provided in the switchgear casing, wherein: Transformer 1
The load switch connected to the secondary side and the load switch connected in parallel in the switchgear housing,
A plurality of circuit breakers connected to the secondary side, and a measurement / breaker provided in the switchgear housing so that it can be inserted and removed freely.
A transformer unit with control equipment.