JP2009077493A - Power receiving and distributing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide power receiving and distributing equipment which will not adversely affect an apparatus stored inside a casing, even if an arc occurs in a connecting part of an insulation wire for branching and high-voltage wiring at branching of a part of power supplied to a transformer to an external extension panel via the insulation wire for branching. <P>SOLUTION: The power receiving and distributing equipment 1 is provided with a high-voltage circuit breaker 11; to which a high-voltage wire 31 from outside is connected; transformers 12a and 12b transforming the voltage supplied through the high-voltage circuit breaker 11 into prescribed voltage; a wiring circuit breaker 13 arranged between the transformers 12a and 12b and a load; and the casing 10 storing the respective circuit breakers 11 and 13 and the transformers 12a and 12b. The connecting part of the insulation wire for branching 33, which is branched from an electrical path between the high-voltage circuit breaker 11 and the transformers 12a and 12b; a high-voltage wiring 34, which is connected to the insulating wire for branching 33 and transmits power to the extension panel 2, is disposed on the outer wall of the casing 10; and a cable connection box 18, covering the connecting part, is installed in the casing 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power receiving and distribution facility including a transformer, a circuit breaker for wiring, and the like.

  Conventionally, in business establishments such as factories and stores, power receiving / distributing facilities used by consumers to receive power from electric utilities have been installed (see, for example, Patent Document 1).

Power distribution equipment is supplied via a high-voltage circuit breaker and a high-voltage circuit breaker that disconnects the high-voltage line (that is, interrupts the reception of high-voltage power) when a high-voltage line drawn from the outside is connected and a short-circuit accident occurs. Is installed in the electrical circuit between the transformer that transforms the voltage to a lower predetermined voltage and the load equipment installed outside and the transformer, and supplies power to the load when a short-circuit accident occurs on the load side. The circuit breaker for wiring is provided, and the voltage transformed by the transformer is supplied to the load device through the circuit breaker for wiring. And in such a power distribution equipment, a high voltage circuit breaker, a transformer, and a circuit breaker are accommodated in one outer box.
JP 11-98621 A (paragraphs [0002]-[0005] and FIGS. 11 and 12)

  By the way, when a factory extension or production line is added, or when a store floor is increased, it is necessary to add transformers and circuit breakers for power distribution facilities. Due to the large size of the circuit breaker, the extension could not be stored in the outer box of the existing power distribution facility. In such a case, it is conceivable to install a new power receiving / distributing facility with a built-in high voltage circuit breaker, transformer and circuit breaker next to the existing power receiving / distributing facility. In some cases, there was not enough free space to add.

  Therefore, an extension panel containing only the transformer and the circuit breaker is installed next to the existing power distribution facility, and power is transmitted to the transformer from the electric circuit between the high voltage circuit breaker and the transformer of the existing power distribution facility. Branch off the branch insulated wire that branches a part of the power to be connected, and connect one end of the high-voltage wiring to the branch insulated wire inside the outer box of the existing power distribution facility, and through the outer wall of the outer box High-voltage wiring was led out from the hole, and this high-voltage wiring was introduced inside the expansion panel and connected to the transformer inside the expansion panel.

  However, when the existing power distribution facilities and expansion panels are connected by the method described above, the connection part between the insulated insulated wire for branching and high-voltage wiring, which is likely to cause a ground fault or short circuit, is inside the outer box. Therefore, when a ground fault or short circuit occurs, the arc generated at the above connection site may adversely affect the equipment (for example, high voltage circuit breaker or transformer) stored in the outer box. .

  The present invention has been made in view of the above problems, and its purpose is to branch a part of the power supplied to the transformer to an external expansion panel via a branching insulated wire. An object of the present invention is to provide a power distribution facility that does not adversely affect the equipment housed in the outer box even when an arc is generated at the connection portion between the branch insulated wire and the high voltage wiring.

  In order to achieve the above object, the invention of claim 1 is supplied via a high-voltage circuit breaker and a high-voltage circuit breaker that interrupts the high-voltage line when an external high-voltage line is connected and an abnormal current flows through the high-voltage line. A transformer for transforming the voltage to a predetermined voltage, a circuit breaker for supplying the voltage transformed by the transformer to the load and interrupting the power supply to the load when an abnormal current flows on the load side, a high-voltage circuit breaker, And an outer box that houses the circuit breaker for wiring and branching from the electric circuit between the high-voltage circuit breaker and the transformer, and part of the power supplied from the high-voltage circuit breaker to the transformer A branch insulated wire and a high-voltage wiring that is electrically connected to the branch insulated wire and transmits electric power to the outside of the outer box. For cable connection that is placed on the outer wall of the box and covers the connection area Characterized in that a body.

  The invention of claim 2 is characterized in that, in the invention of claim 1, a cable protection tube through which high-voltage wiring led out from the cable connection box is passed is attached to the cable connection box. To do.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the supporting insulator for supporting the connection portion between the branching insulated wire and the high voltage wiring with the conductive portion from which the insulating coating is removed in the branching insulated wire It is provided on the outer wall of the box.

  According to the invention of claim 1, since the branching insulated wire and the high voltage wiring are connected outside the outer box, it is assumed that an arc has occurred at the connection site between the branching insulated wire and the high voltage wiring during a short circuit or the like. However, there is an effect that it is possible to prevent the generated arc from adversely affecting the high voltage circuit breaker or the transformer housed in the outer box. In addition, since the connection portion between the branching insulated wire and the high-voltage wiring is covered with the cable connection box, there is an effect that the possibility of occurrence of a ground fault or a short circuit due to wind and rain can be reduced.

  According to the invention of claim 2, since the high voltage wiring can be prevented from being exposed to the outside by passing the high voltage wiring through the cable protection tube attached to the cable connection box, a ground fault or a short circuit occurs. There is an effect that the fear can be further reduced.

  According to invention of Claim 3, since the site | part from which the insulation film of the branch insulation electric wire was removed is supported by the support insulator provided in the outer side wall of the outer box, the site | part from which the insulation film was removed, and an outer wall Can be reliably separated from each other, and even when the outer wall is wet with rain or the like, it is possible to prevent occurrence of a short circuit or a ground fault.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic connection diagram of a power receiving / distributing system using a cubicle type power receiving / distributing facility 1 according to the present invention and an extension panel 2 that receives power transmission via the power receiving / distributing facility 1. Here, the power distribution facility 1 transforms (steps down) high-voltage power supplied from the electric utility side, distributes it to a load circuit (not shown), and part of the electric power supplied from the electric utility side, The power is transmitted to the expansion panel 2 installed adjacent to the power distribution facility 1.

  The power distribution facility 1 is connected to an external high voltage line 31, and when an abnormal current such as a short circuit current or a ground fault current flows through the high voltage line 31, the high voltage line 31 is cut off (that is, by opening a built-in contact). The high voltage circuit breaker 11 that cuts off the reception of high voltage power), the transformers 12a and 12b that transform the voltage supplied through the high voltage circuit breaker 11 to a predetermined voltage, and the voltage transformed by the transformers 12a and 12b A plurality of wiring circuit breakers 13 that supply power to a load (not shown) and interrupt power supply to the load when an abnormal current flows on the load side. These high-voltage circuit breakers 11 and transformers 12a and 12b The circuit breaker 13 for wiring is accommodated in the outer box 10. A power supply / demand meter transformer VCT is connected between the high-voltage line 31 drawn in from the outside and the high-voltage circuit breaker 11, and the power amount for measuring the power amount from the output of the power supply / demand meter transformer VCT. A total WH is provided.

  A branch insulated wire 33 is branched from a high voltage wiring 32 that electrically connects the high voltage circuit breaker 11 and the transformers 12a and 12b. This branch insulated wire 33 is provided to branch a part of the electric power supplied from the high voltage circuit breaker 11 to the transformers 12a and 12b, and is connected to the high voltage wiring 34 electrically connected to the branch insulated wire 33. Electric power is transmitted to the extension panel 2 through the cable.

  On the other hand, the expansion panel 2 that receives power from the power distribution facility 1 sets the high voltage wiring 36 connected to the high voltage wiring 34 drawn from the outside and the voltage supplied via the high voltage wirings 34 and 36 to a predetermined voltage. Transformer 21 for voltage transformation (step-down), and a plurality of wirings that supply the voltage transformed by transformer 21 to a load (not shown) and cut off power supply to the load when an abnormal current flows on the load side The transformer 21 and the circuit breaker 22 are housed in the outer box 20 of the expansion panel 2.

  Next, the structure of the power distribution / distribution facility 1 and the extension panel 2 will be described with reference to FIGS.

  As shown in FIGS. 2A and 2B, the outer box 10 of the power distribution facility 1 is made of a metal box 10a whose front and rear surfaces are open, and a metal that covers the front side of the box 10a so that it can be opened and closed. Door 10b and a metal door 10c that covers the rear side of the box 10a so that it can be opened and closed. Inside the outer box 10, the high-voltage circuit breaker 11, the transformers 12a and 12b, and the circuit breaker 13 are connected. Etc. are stored. Then, in order to transmit electric power from the power distribution facility 1 to the extension panel 2, the above-described branch insulated wire 33 is led out to the outside of the outer box 10, but in this embodiment, it is shown in FIG. 2 and FIG. Thus, on the outer wall (right side surface) of the box 10a, the feeder unit 14 for connecting the high-voltage wiring 34 for power transmission to the branch insulated wire 33 is provided.

  As shown in FIGS. 3A and 3B, the feeder unit 14 is disposed outside the three through-holes 10d that open on the side surface of the box 10a, and is led out through the through-holes 10d. The wire support 15 that supports the branched insulated wire 33, the support lever 16 that is arranged in the left-right direction below the three through-holes 10d, and the high pressure that is disposed below the support lever 16 An electric wire support 17 that supports the tip of the outer jacket of the wiring 34 and a substantially box-shaped opening on one surface, and covers the electric wire support 15, the support insulator 16, and the electric wire support 17 outside the box 10a. And a metal cable connection box 18 attached to the side surface. Note that one end side of the cable protection tube 35 is fixed to the opening hole 18a opened on the lower side surface of the cable connection box 18, and the inside of the cable connection box 18 and the cable protection tube 35 are fixed. The inside communicates.

  3A and 3B show a state before the high-voltage wiring 34 is supported by the support insulator 16, and the high-voltage wiring 34 is fixed to the support insulator 16 by an appropriate method when the connection work is completed. The connection part of 34 and the insulated wire 33 for branching is supported by the support insulator 16. Here, when connecting the branch insulated wire 33 and the high-voltage wiring 36 inside the feeder unit 14, the three branch insulated wires 33 are led out through the through hole 10d to the outside of the box 10a. In addition, after the branch insulated wire 33 is supported by the wire support 15, the connection is made of a copper plate attached to each conductor 33 a on the distal end side of each branch insulated wire 33 from which the insulation coating has been removed. The terminal piece 33b is supported by the support insulator 16. On the other hand, a high-voltage wiring 34 is inserted into the cable protection tube 35, and the high-voltage wiring 34 is supported after the front end portion of the jacket of the high-voltage wiring 34 led out from the cable protection tube 35 is supported by the wire support 17. These three core wires 34a are fixed to the support insulator 16 with screws or the like, whereby the branching insulated wires 33 and the high-voltage wires 34 are electrically connected. Then, by fixing the cable connection box 18 to the outer wall of the outer box 10 by an appropriate method so as to cover the electric wire support 15, the support insulator 16 and the electric wire support 17, A connection portion with the high-voltage wiring 34 is covered by the cable connection box 18. The cable connection box 18 has a seal member such as packing interposed in a contact portion with the box 10a, and a gap between the box 10a and the box 10a is sealed. Prevents water and dust from getting inside.

  On the other hand, as shown in FIGS. 4 (a) and 4 (b), the outer box 20 of the extension panel 2 is made of a metal box 20a having an open front surface and a metal box that covers the front side of the box 20a so as to be freely opened and closed. It is comprised with the door 20b, and the additional transformer 21 and the circuit breaker 22 for wiring are accommodated in the inside of this outer box 20. FIG. A feeder unit 23 that electrically connects between the high-voltage wiring 34 from the power distribution facility 1 and the other end of the high-voltage wiring 36 having one end connected to the transformer 21 is provided on the outer surface of the outer box 20. The other end side of the high-voltage wiring 34 introduced into the feeder unit 23 through the cable protection tube 35 is electrically connected to the high-voltage wiring 36 in the feeder unit 23, so that the extension panel from the power distribution / distribution facility 1 is installed. Electric power is transmitted to 2.

  As described above, in the power distribution facility 1 of the present embodiment, the branch insulated wire 33 for branching a part of the power supplied via the high voltage line 31 and the branch insulated wire 33 are connected and expanded. Since the connection part for connecting the high-voltage wiring 34 for transmitting power to the panel 2 is arranged outside the outer box 10, the insulation wire 33 for branching and the high-voltage wiring 34 are connected in the event of a short circuit or a ground fault. Even if an arc is generated at the connection site, it is possible to prevent the generated arc from adversely affecting the high voltage circuit breaker 11 and the transformer 12 housed in the outer box 10. In addition, since the connecting portion between the branching insulated wire 33 and the high-voltage wiring 34 arranged outside the outer box 10 is covered with the cable connecting box 18, there is a possibility that a ground fault or a short circuit may occur due to wind and rain. This can be reduced. Further, the portion of the branch insulating wire 33 from which the insulating coating has been removed by the support insulator 16 provided on the outer wall of the outer box 10 (side surface of the box 10a) (that is, the branch insulating wire to which the connection terminal piece 33b is connected). 33), the distance between the portion from which the insulating coating has been removed and the outer wall of the outer box 10 can be reliably widened to ensure an insulating distance. Even if it gets wet, etc., it is possible to prevent a short circuit or a ground fault from occurring.

  The high-voltage wiring 34 used for transmitting power from the power distribution facility 1 to the expansion panel 2 is placed in a cable protection tube 35 having both ends attached to the cable connection boxes 18 and 24 of the feeder units 14 and 23. Since it is inserted, it is possible to prevent the high-voltage wiring 34 from being exposed to the outside, and the high-voltage wiring 34 can be prevented from being exposed to water, and the possibility of occurrence of a ground fault or a short circuit can be further reduced. .

It is a wiring diagram of the power distribution / distribution equipment and expansion panel of this embodiment. (A) is a front view same as the above, (b) is a right side view same as the above. The feeder unit same as the above is shown, (a) is a sectional view seen from the front, and (b) is a side sectional view. The expansion board arrange | positioned adjacently same as the above is shown, (a) is a front view, (b) is a left view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power distribution equipment 2 Expansion board 11 High voltage circuit breaker 12a, 12b Transformer 13 Circuit breaker 14 Feeder unit 18 Box for cable connection 31 High voltage line 33 Insulated electric wire for branch 34 High voltage wiring

Claims (3)

A high-voltage circuit breaker that interrupts the high-voltage line when an external high-voltage line is connected and an abnormal current flows through the high-voltage line; a transformer that transforms a voltage supplied via the high-voltage circuit breaker to a predetermined voltage; A circuit breaker for supplying the voltage transformed by the load to the load and interrupting the power supply to the load when an abnormal current flows on the load side, and a high voltage circuit breaker, a transformer and a circuit breaker for housing And
A branch insulated wire for branching a part of the power supplied from the high voltage circuit breaker to the transformer, and branched from the electric circuit between the high voltage circuit breaker and the transformer, and electrically connected to the branch insulated wire Provided with high-voltage wiring to transmit power to the outside of the outer box connected,
A power distribution / distribution facility characterized in that a connection portion between a branch insulated wire and a high-voltage wiring is disposed on an outer wall of the outer box, and a cable connection box is provided to cover the connection portion.   The power distribution facility according to claim 1, wherein a cable protection tube through which high-voltage wiring led out from the cable connection box is passed is attached to the cable connection box.   A support insulator for supporting a connection portion between the branching insulated wire and the high-voltage wiring with a conductive portion from which the insulating coating is removed in the branching insulated wire is provided on an outer wall of the outer box. The power distribution facility according to claim 1 or 2.

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