JP3178307B2 - Transformer unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer unit of a low-voltage distribution facility which is distributed and disposed near a plurality of loads in a building, a factory or the like.

[0002]

2. Description of the Related Art A conventional transformer unit will be described with reference to FIG. 9 showing a front view and FIG. 10 showing a circuit diagram. In these figures, reference numeral 1 denotes 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 panel 1, 7 is a ventilation hole for intake formed in the lower part of the door 6, 8 is an ammeter switch provided in the center of the door 6, and 9 is this switch 8.
Is a viewing window for viewing the thermometer of the transformer 2.

[0003] Reference numeral 10 denotes two ground fault detectors arranged in parallel above the switch 8 to detect a ground fault on the low voltage side. Reference numeral 11 denotes a collective fault indicator provided above both detectors 10 to indicate a fault. , 12 is an ammeter provided above the display 11 and measures the current on the low voltage side. 13 is a signal lamp provided above the ammeter 12, and a voltage is applied to the secondary side of the transformer 2. Display whether or not it is. Reference numeral 14 denotes a switch 8, a detector 10, a display 11, an ammeter 12, and a signal lamp 1.
It is a measurement / control instrument composed of 3 grades.

[0004] Reference numeral 15 denotes a ventilation box provided on the top plate of the storage panel 1 and having an exhaust ventilation hole 16 formed therein.
The outside air taken in from outside is exhausted to the outside through the exhaust ventilation hole 16 by natural convection, thereby preventing the temperature inside the storage board 1 from rising.

[0005] Reference numeral 17 denotes a transformer primary cable lead-in board provided adjacent to the left side of the storage board 1, and a primary cable 18 is led therein. Reference numeral 19 denotes a circuit breaker panel for the secondary branch wiring of the transformer provided adjacent to the right side of the storage panel 1, and four circuit breakers 20 are disposed therein.

[0006]

In the case of the conventional transformer unit, the transformer 2 and the equipment on the primary side and the secondary side of the transformer 2 are housed in independent panels 1, 17, and 19, respectively. Therefore, there is a problem that a large installation space is required and installation work becomes large.

An object of the present invention is to provide a transformer unit which can reduce installation space and simplify installation work, keeping the above points in mind.

[0008]

In order to solve the above-mentioned problems, a transformer unit according to the present invention comprises a primary and secondary bushings of the transformer on an upper part of a transformer housing in which the transformer is housed.
Through the rear panel and the front of the rear of the mounting angle
Switch consisting of a front panel on the side, a ground wire and a control cable panel
A gear housing , provided in the rear panel;
A load switch connected to the primary terminal of the next bushing;
The primary cable is inserted through the top plate of the rear panel and
Drawn into the side panel and connected to the other end of the load switch.
Cable connector and the operation panel
A bar is loosely inserted into each hole of the front panel of the front panel, and one end is connected.
The secondary bus is connected via the connection conductor / current transformer of the connection bus unit.
Shutdown for multiple wiring connected to the secondary terminal of the sink
And the front panel connected to the other end of the circuit breaker for wiring.
A low-voltage main circuit cable pulled out from the top plate of the
The front panel is provided at the front lower opening of the front panel so that it can enter and exit freely.
Storage box provided with measurement and control equipment, and the ground wire and control
It is inserted into the top plate of the cable panel,
Through the inside of the front panel and into the front panel,
Distribution to the ground line and the measurement and control instruments are grounded via
And a wired control cable . Therefore, 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 First, a front view,
This will be described with reference to FIG. 1 showing a right side view, FIG. 1 showing a plan view of FIG. 1A, and FIG. 8 showing a circuit diagram. In these figures, the same symbols as those in FIGS. 9 and 10 indicate the same or corresponding elements, and the differences are as follows.

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

Next, the rear panel 29 will be described with reference to FIG. Reference numeral 30 denotes a door closing the rear opening of the rear panel 29, and reference numerals 31 and 32 denote both bushings 26.
The primary and secondary terminals 33 of the transformer respectively derived from the above are support plates provided in parallel with each other above and below substantially the center of the rear panel 29, and the load switch 3 is mounted thereon. I have.

Reference numeral 34 denotes a fuse provided in the load switch 3, reference numeral 35 denotes an arc-extinguishing chamber of the load switch 3, and reference numeral 36 denotes a plurality of cable connectors provided through a top plate of the rear panel 29.
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. I have.

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. Reference numeral 37 denotes a terminal box mounted on the front of the lower surface of the front panel 28, and performs transmission and reception with a central monitoring panel (not shown). 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 freely enter and exit, and has an upper surface opened. A ground fault detector 10, a collective fault indicator 11, an ammeter changeover switch 8, an ammeter 12, and a 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 a handle fixed to both sides of the front surface of the storage box 38; 41, five rectangular holes formed at regular intervals in the front panel of the front panel 28; Are provided in parallel with each other.
, Four wiring breakers 20 are attached in order from the left side, and the wiring breakers 20 are located behind the respective square holes 41, and the operation levers 43 of the respective breakers 20 are loosely inserted into the respective square holes 41. The right end square hole 41 is closed by a lid.

Reference numeral 44 denotes a connection bus unit. As shown in FIG. 6, a first connection bus 45, a second connection bus 46,
The first connection bus 45 is constituted by a third connection bus 47.
Are connected conductors 48, 5 in the left and right direction, as shown in FIG.
It consists of one vertical connecting conductor 49 and one longitudinal measuring conductor 50.

Reference numeral 51 denotes a U-shaped mounting portion formed above the connection conductor 49, and 52 denotes a wiring breaker connection portion formed by bending the lower portion of the connection 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, and the five connection conductors 49 are mounted on the front surface of the connection conductor 48 at equal intervals. By brazing the edges,
Electrical conduction is ensured.

Reference numeral 54 denotes a temporary cable connecting portion at the upper end of the right-most connecting conductor 49, which protrudes from the upper edge of the connecting conductor 48 and is connected to a temporary cable. 55 is 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 rivets 53,
The measuring section 56 is located at the rear, and the base section 55 is brazed to the connecting conductor 48.

The second connection bus bar 46 has substantially the same configuration as the first connection bus bar 45, but each connection conductor 49
Is slightly 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 right end connection conductor 49 is long.

Next, in the third connection bus 47, the position of each connection conductor 49 is further shifted to the right, the lower length is shorter than in the case of the second connection bus 46, and the connection conductor 49 at the right end. Are temporarily longer.

As shown in FIG. 6, the second and third connection buses 46 and 47 are arranged behind the first connection bus 45 at predetermined intervals, and the second and third connection buses 46 and 47 are sequentially arranged. 3
The connecting conductors 48 of the connecting buses 46, 47 are sequentially positioned below, and the circuit breaker connecting portions 52 of the connecting conductors 49 of the connecting buses 45, 46, 47 are made the same height. Are made the same height, and a connection bus unit 44 is formed.

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

Reference numeral 58 denotes an opening formed in the left and right direction at the front of the top plate of the front panel 28, closed by a cover plate (not shown), and connected to the other end of the circuit breaker 20 for low voltage. The circuit cable 59 is inserted through the through hole of the cover plate and drawn out. Reference numeral 60 denotes a ground wire / control cable board provided on the left side of the front panel 28, and 61 denotes an opening formed in a top plate of the cable board 60, which is closed by a cover plate (not shown) and shown in FIG. The chained ground line 62 and the solid line control cable 63 are inserted through the through holes in the cover plate, drawn into the front panel 28 through the cable board 60, and the ground line 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, and 50 of the connection bus unit 44 are brazed, there is no need to perform maintenance and inspection, and the number of maintenance and inspection portions can be reduced.

Further, since the switchgear housing 25 is provided above the transformer housing 22, the transformer housing 22
Only need to be installed.

[0025]

The present invention has the following effects. The transformer unit of the present invention includes a primary and secondary bushings of the transformer 2 on an upper part of a transformer housing 22 in which the transformer 2 is housed.
Provided at the rear of the mounting angle 27.
Rear panel 29 and front panel 28 on the front side, ground wire and control cable
Switchgear housing 25 consisting of
9, one end of which is the primary end of the primary bushing 26.
The load switch 3 connected to the slave 31 and the top plate of the rear panel 29
And the primary cable 18 is pulled into the rear panel 29.
Cable connector connected to the other end of the load switch 3
36, and are arranged side by side in the front panel 28, and each operation lever 43
It is loosely inserted into each hole 41 of the front panel of the front panel 28 and one end is connected.
2 via the connection conductor 49 and the current transformer 4 of the busbar unit 44
Multiple connected to the secondary terminal 32 of the next bushing 26
To the other end of the wiring breaker 20
The low-pressure main body drawn out from the top plate of the front panel 28 to the outside
The circuit cable 59 and the front lower opening 58 of the front panel 28
It is provided so that it can enter and exit freely, and a measurement and control instrument 14 is provided on the front.
Storage box 38 and the top plate of the ground wire / control cable panel 60
It is inserted and passes through the ground wire and control cable
Drawn into the panel 28 and grounded via the zero-phase current transformer 5
Control line wired to the ground line 62 and the measurement and control instrument 14
Since the cable 63 is provided, only the transformer housing 22 needs to be installed, so that the installation space can be reduced and the installation work can be simplified.

[Brief description of the drawings]

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

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

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

FIG. 4 is a front view of FIG. 3 from which a front portion is removed.

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

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

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

FIG. 8 is a circuit diagram of FIG. 1;

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 and control equipment 20 Circuit breaker 22 Transformer housing 25 Switchgear housing 26 Bushing

Continuation of front page (56) References JP-A-4-364308 (JP, A) JP-A-60-128806 (JP, A) JP-A-7-322426 (JP, A) JP-A-6-121416 (JP) , A) Japanese Utility Model 1-180107 (JP, U) Japanese Utility Model 1-78917 (JP, U) Japanese Utility Model 60-190091 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB H02B 1/26-1/36 H02B 1/46-1/48 H02B 1/20 H02B 1/56 H02B 3/00

Claims (1)

(57) [Claims] 1. A transformer housing in which a transformer is housed, and provided on an upper portion of the transformer housing via primary and secondary bushings of the transformer , after a mounting angle. Side rear panel
A switch gear housing including a front panel on the front side, a ground wire and a control cable panel, and a load provided in the rear panel and having one end connected to a primary terminal of the primary bushing. A switch and a top cable of the rear panel, and a primary-side cable connected to the rear panel
Drawn into the side panel and connected to the other end of the load switch.
Cable connector and the operation panel are arranged side by side in the front panel.
It is loosely inserted into each hole of the front panel, and one end is connected to the connection bus unit.
Secondary end of the secondary bushing via a continuity conductor / current transformer
A plurality of circuit breaker that is connected to the child, is connected to the other end of the circuit breaker for the wiring, the top plate of the front panel
A low-voltage main circuit cable drawn out of the front panel, and a lower-side front opening of the front panel, which is provided so as to be able to enter and exit freely.
A storage box provided with measurement and control instruments are inserted into the top plate of the ground line and control cable board, the contact
Pulled into the front panel through the ground wire and control cable panel
Rarely, a transformer unit comprising: a ground wire grounded via a zero-phase current transformer; and a control cable wired to the measurement / control instrument.