JP7364345B2 - Temporary power supply box for switchgear and temporary power supply method - Google Patents

Description

The present invention relates to a temporary supply box for temporarily supplying power from a mobile transformer, a mobile generator vehicle, etc. to a switchgear via a moving cable, and a method for temporarily supplying power using the box, and particularly to an existing switchgear. The present invention relates to a temporary supply box for a switchgear to which a moving cable can be connected, and a method for temporarily supplying electric power.

Electric power generated at a power plant is lowered in voltage at several substations and then sent to each demand point, and distribution equipment called switchgear is installed at each substation and demand point. Switchgear is a closed-type power distribution board that has functions such as opening, closing, and controlling power, and has circuit breakers, disconnectors, etc. divided into unit circuit sections inside a grounded metal casing. It has a housed structure.

Here, the structure of the switchgear will be explained using FIG. 6. Note that Figure 6(a) is a diagram showing the structure of a typical switchgear installed in a substation, and Figure 6(b) is a diagram showing the appearance of the connection part of the customer underground line. be.
As shown in FIG. 6(a), the switchgear 52 has a substantially rectangular parallelepiped structure, and has four compartments 53a to 53d provided inside a casing with doors attached at the front and rear. A bus bar 54 is installed so as to cross the four compartments 53a to 53d.
Further, the compartment 53a houses a circuit breaker 55 that is interposed between the secondary side of the main transformer 51 that steps down the power of the distribution line 50 and the bus bar 54, and a lightning arrester 56 that is connected to the bus bar 54. An instrument transformer 57 is housed in the compartment 53b.

The compartment 53c houses a power supply side disconnector 58a, a load side disconnector 60a, and a circuit breaker 59a installed between them, and the compartment 53d houses a power supply side disconnector 58b and a load side disconnector. A circuit breaker 60b and a circuit breaker 59b installed between them are housed. Further, the power supply side disconnector 58a is connected to the bus bar 54 via a three-phase power cable 61a, and the load side disconnector 60a is connected to the overhead line 62. The power supply side disconnector 58b is connected to the bus bar 54 via the three-phase power cable 61b, and the load side disconnector 60b is connected to the customer underground line 63.

As shown in FIG. 6(b), in the compartment 53d, three insulators 64 are installed upright on the bottom plate 66 of the case, and cable insertion holes ( The customer underground wire 63, whose tip end is inserted into the compartment 53d through the (not shown), stands up almost vertically from the bottom plate 66, and the three wires corresponding to the three phases are connected by the three insulators 64. Each is supported. Further, a cable head 63a provided at the tip of the customer underground cable 63 is connected to a load-side disconnector 60b via a copper band 65.

In the switchgear 52 shown in FIG. 6(a), if the main transformer 51 fails, a mobile transformer is installed between the distribution line 50 and the circuit breaker 55, so that the power on the distribution line 50 is transferred to the mobile transformer. The voltage is reduced by the converter and supplied to the switchgear 52. Therefore, the switchgear 52 has a structure to which a cable of a mobile transformer can be connected.

Regarding connecting a cable of a mobile transformer to a switchgear, for example, Patent Document 1 discloses an invention named "cable connection device."
The invention disclosed in Patent Document 1 has a connection terminal for connecting a cable connected to a mobile device to a connection terminal of a circuit in the switchgear, and a pullout type circuit breaker instead of a pullout type circuit breaker of the switchgear. It has a structure that allows it to be placed in the container storage position.
According to such a structure, the mobile equipment is connected to the circuit in the switchgear by simply pulling out the pullout circuit breaker from the switchgear and accommodating the cable connection device in its place, so that the cables of the mobile equipment can be connected to the circuit in the switchgear. The work of connecting to the switchgear can be done in a short time.

Further, Patent Document 2 discloses an invention under the name "Switchgear" that relates to a switchgear provided with a metal closed type casing that allows an external line cable to be easily drawn into a cable room.
In the invention disclosed in Patent Document 2, a floor opening provided in a floor plate surrounding a cable room and a back opening provided in a back side wall surrounding the cable room are integrated without using a frame. The structure is such that an opening having an L-shaped cross section is provided in the casing, and an L-shaped cover having an L-shaped cross section is attached to cover this opening.
According to such a structure, the external line cable can be easily drawn into the cable room simply by removing the L-shaped cover. Further, after connecting the terminals in the cable room and the external line cable, the installation work is completed by simply attaching the cover, so that the time required for connecting the external line cable can be shortened.

Japanese Patent Application Publication No. 2016-123178 JP2016-220486A

The invention disclosed in Patent Document 1, which is the above-mentioned prior art, has a problem in that it cannot be applied to anything other than switchgear equipped with a pullout type circuit breaker. Furthermore, if the drawer type circuit breaker has a different size depending on the switchgear, a cable connection device must be made for each switchgear, resulting in a lack of versatility.
If the switchgear is connected to a dedicated line for the customer, it is difficult to shut off the power to the switchgear for a long period of time, so it is necessary to secure a line to bypass the switchgear and supply power to the customer. Must. If the dedicated line for a customer is an underground line, it is not easy to connect a mobile cable such as a mobile transformer. The invention disclosed in Patent Document 1 does not take this point into consideration at all. Therefore, in the invention disclosed in Patent Document 1, when inspecting or repairing the switchgear, it becomes necessary to bypass the switchgear body and connect a cable such as a mobile transformer to the customer underground line. There was a problem that it could not be applied in some cases.

The invention disclosed in Patent Document 2 is characterized by providing a specially shaped opening in the switchgear housing, so when applying it to an existing switchgear, the housing must be modified. Therefore, there were problems in that not only could the work of connecting the cables of mobile devices not be completed in a short time, but the work cost would be high.

The present invention has been made in response to such conventional circumstances, and when it becomes necessary to cut power to the switchgear due to inspection or repair work, etc. An object of the present invention is to provide a temporary power supply box for a switchgear that can safely connect a mobile cable such as a mobile transformer in a short time, and a temporary power supply method using the box.

In order to achieve the above object, the first invention provides three underground wires for a customer installed with a tip thereof protruding inside a switchgear to which a door having a first opening is attached. This is a temporary power supply box for switchgear used to temporarily supply electricity to customers by connecting three moving cables connected to a phase alternating current power supply. A housing with three through-holes on the rear surface to be inserted through each, three connection cables installed inside this housing and three moving cables connected to the rear ends, and a conductive cable. and three elongated members each having both ends connectable to the cable head provided at the tip of the customer underground cable and the three connecting cables. It is something to do.

In a temporary power supply box for switchgear with this structure, the three moving cables connected to the moving equipment are connected to the three connecting cables, and both ends of the three long members are connected to the customer's underground ground. Each connection to the cable head of the line and the three connection cables has the effect of electrically connecting the mobile device to the customer underground line.
Further, the casing has the function of preventing workers, small animals, etc. from coming into contact with the moving cable, the connecting cable, or the elongated member and receiving an electric shock when power is supplied to the customer underground line.

The second invention connects three moving cables connected to a three-phase AC power source to a customer underground cable installed with its tip protruding inside the switchgear to which the door is attached. This is a temporary power supply box for switchgear used when temporarily supplying power to customers by doing so.The front side is open and three through holes are provided on the rear side through which three moving cables are inserted. A housing, three connection cables installed inside the housing and connected to the rear ends of the three moving cables, and a conductive cable installed at the tip of the customer underground line. The head and three connection cables are provided with three long members whose ends are connectable to each other, and a temporary door installed on the front of the housing. It is characterized in that it has a second opening that can communicate with the front opening, and is formed so that it can be attached to the switchgear instead of the door.
In the switchgear temporary power supply box having such a structure, the same effect as in the first invention is exhibited when the first opening is not provided in the door of the switchgear housing.

A third invention is the first invention or the second invention, characterized in that three insulators are installed at the tips of the three connection cables, respectively.
In addition to the effects of the first invention or the second invention, in the temporary power supply box for switchgear having such a structure, the three insulators allow a worker or a worker to move near the tip of the connecting cable to which the elongated member is connected. It has the effect of preventing small animals etc. from coming into contact with it and getting an electric shock.

In a fourth invention, in any one of the first to third inventions, the three elongated members have a flexible structure formed by overlapping a plurality of metal flat braided wires. It is characterized by being made of a conductor having
In the temporary power supply box for a switchgear having such a structure, since the elongated member has flexibility, in addition to the effect of any one of the first to third inventions, the elongated member has flexibility. This has the effect of facilitating the work of fixing both ends to the cable head of the customer's underground line and the tip of the connection cable.

A fifth invention is characterized in that in the fourth invention, the three elongated members are each provided with a terminal portion made of a plate material having conductivity and provided with a screw hole at both ends of the conductor. It is something to do.
In the temporary power supply box for switchgear having such a structure, the effect of the fourth invention is that the work of fixing both ends of the elongated member to the cable head of the customer underground cable and the tip of the connecting cable, respectively, is facilitated. It will be demonstrated even more.

A sixth invention is a method for temporarily supplying power to a customer using the temporary power supply box for switchgear according to the first invention, wherein the first opening provided in the door of the switchgear housing is The feature is that three elongated members are inserted into the inside of the switchgear and one end thereof is connected to the cable head of the customer's underground line.
In the sixth invention, the effect of the first invention that is exhibited when the first opening is provided in the door of the switchgear case is similarly exhibited.

A seventh invention is a method for temporarily supplying power to a customer using the temporary power supply box for a switchgear according to the second invention, wherein the door of the switchgear housing is removed and the second opening is opened. The present invention is characterized by attaching the temporary door having the temporary door to the switchgear, and inserting three elongated members into the switchgear from the second opening of the temporary door, and connecting one end of the elongated members to the cable head of the customer underground line. It is something to do.
In the seventh invention, the effect of the second invention that is achieved when the door of the switchgear housing is not provided with the first opening is similarly achieved.

As explained above, in the first invention, even if it is necessary to cut off the power for inspection or repair work on the switchgear in which the first opening is provided in the door of the housing, It is easy to connect the customer underground line connected to the switchgear and a mobile cable such as a mobile transformer, and it also prevents workers or small animals from getting electrocuted if they come into contact with the connection point between the customer underground line and the mobile cable. There is no risk of it happening. Therefore, according to the first invention, it is possible to temporarily supply power to a customer by connecting a mobile cable for a mobile device or the like to the customer underground line and safely perform the work in a short time.

According to the second invention, even if the door of the switchgear housing is not provided with the first opening, the same effect as the first invention can be achieved by replacing the door with a temporary door. In this case, there is no need to create a new opening corresponding to the first opening in the existing door, so the work of connecting the mobile cables of mobile devices to the customer's underground cable can be done in a short time and at low cost. can be done.

According to the third invention, in addition to the effects of the first invention or the second invention, it is possible to safely temporarily supply power to customers by connecting mobile cables for mobile devices to underground cables for customers. The effect of the first invention, which can be carried out even more effectively, is further exhibited.

According to the fourth invention, since the installation work of the elongated member is facilitated, in addition to the effects of any one of the first to third inventions, the customer underground line and the connection cable can be attached to the elongated member. This has the effect that electrical connection work can be performed efficiently in a short period of time.

According to the fifth invention, since the work of installing the long member is easier than the fourth invention, the work of electrically connecting the customer underground line and the connection cable via the long member can be completed in a short time. The effect of the fourth invention, which is that it can be carried out efficiently, is further exhibited.

According to the sixth invention, the effect of the first invention, which is achieved when the first opening is provided in the door of the switchgear housing, is similarly achieved.

According to the seventh invention, the effect of the second invention, which is achieved when the door of the switchgear housing is not provided with the first opening, is similarly achieved.

1 is a perspective view showing an example of the external appearance of a temporary power supply box for a switchgear according to an embodiment of the present invention. (a) is a front view of the temporary door shown in FIG. 1, and (b) is a view taken in the direction of arrow A in FIG. 1. 2 is a view taken in the direction of arrow B in FIG. 1. FIG. (a) is a view taken in the direction of arrow C in FIG. 1, and (b) is an external view of the conductor shown in (a) of the same figure. 1 is a flowchart showing a procedure of a temporary power supply method according to an embodiment of the present invention. (a) is a diagram showing the structure of a general switchgear installed in a substation, and (b) is an external view of a connection part of a customer underground line.

A specific structure of a temporary power supply box for a switchgear according to the present invention will be described using FIGS. 1 to 4, and a method for temporarily supplying power according to the present invention will be described using FIG. 5. However, the constituent elements already explained using FIG. 6 are given the same reference numerals, and the explanation thereof will be omitted.

FIG. 1 is a perspective view showing an example of the external appearance of a temporary power supply box for a switchgear according to an embodiment of the present invention. 2(a) is a front view of the temporary door shown in FIG. 1, and FIG. 2(b) is a view taken in the direction of arrow A in FIG. 1. Further, FIG. 3 is a view taken in the direction of arrow B in FIG. 1, and FIG. 4(a) is a view taken in the direction of arrow C in FIG. FIG. 4(b) is an external view of the conductor shown in FIG. 4(a). Note that in FIGS. 1 and 2(a), the hinge used for attaching the temporary door to the switchgear is not shown, and in FIG. 2(b), the temporary door is not shown. Further, in FIGS. 3 and 4(a), the switchgear is shown with broken lines, and the brackets for fixing the connection cables are not shown.

The switchgear temporary power supply box 1 of the present invention can be used to supply a three-phase AC power source for mobile equipment, etc. when the customer underground line 63 is installed with its tip protruding inside the switchgear 52. It is used when connecting three connected moving cables to a cable head provided at the tip of the customer underground line 63. As shown in FIG. 1, the switchgear temporary power supply box 1 has a substantially rectangular parallelepiped shape, and has a housing 2 with a flat lid 12 removably attached to the top surface 2c, side surfaces 2d, 2d, and rear surface 2b. and a doorknob 3a, and a temporary door 3 formed to be attachable to the casing of the switch gear 52 in place of the door of the casing of the switch gear 52 described above. Further, the lid 12 on the rear surface 2b of the housing 2 is provided with three through holes 4a through which the moving cable can be inserted.

As shown in FIG. 2(a), the temporary door 3 is provided with a rectangular opening 3b below the doorknob 3a. In addition, as shown in FIG. 2(b), the housing 2 has an opening 4b in the front surface 2a that has the same shape as the opening 3b of the temporary door 3, and a connection cable, which will be described later, is fixed inside the opening 4b. Two brackets 5a and 5b are installed horizontally in the width direction (direction orthogonal to the front-rear direction). Note that the temporary door 3 is detachably attached to the front surface 2a of the housing 2 so that the opening 3b communicates with the opening 4b.

As shown in FIGS. 3 and 4(a), the switchgear temporary power supply box 1 includes, in addition to a housing 2 and a temporary door 3, three wires inserted into the housing 2 through three through holes 4a. three connecting cables 6 to which the moving cables 10 of are connected to the rear ends, three insulators 7 which are respectively inserted to the tips of the three connecting cables 6, and a cable head with customer underground cables 63 at both ends. 63a (see FIG. 6(b)), and three elongated members 8 formed to be connectable to the tips of the three connecting cables 6, respectively.
Further, the three connecting cables 6 and the three insulators 7 are held by holding tools 9a and 9b, respectively. Further, the holder 9a is fixed to the casing 2 via a bracket (not shown), and the holder 9b is fixed to the casing 2 via brackets 5a, 5b.

In the switchgear temporary power supply box 1 having such a structure, the three moving cables 10 connected to the moving equipment are respectively connected to the three connecting cables 6, and both ends of the three elongated members 8 are connected to each other. When each cable head 63a of the customer underground line 63 is connected to the three connection cables 6, the mobile device and the customer underground line 63 are electrically connected. At this time, the housing 2 has the function of preventing workers, small animals, etc. from coming into contact with the moving cable 10, the connecting cable 6, or the long member 8 and receiving an electric shock while power is being supplied to the customer underground line 63. have In particular, the three insulators 7 prevent a worker, a small animal, etc. from coming into contact with and receiving an electric shock near the tip of the connection cable 6 to which the elongated member 8 is connected.

In other words, even if the switchgear 52, which does not have an opening in the housing door, has a power outage due to inspection or repair work, the switchgear temporary power supply box 1 can be used to connect the switchgear 52. This facilitates the work of connecting the customer underground line 63 and the mobile cable 10 such as a mobile transformer. Further, at this time, there is no risk that a worker, a small animal, or the like will come into contact with the connection point between the customer underground line 63 and the moving cable 10 and receive an electric shock. Furthermore, there is no need to process the door of the housing of the switchgear 52 to provide an opening.
Therefore, according to the switchgear temporary power supply box 1, it is possible to connect the mobile cable 10 for mobile equipment or the like to the customer underground line 63 and temporarily supply power to the customer at low cost, in a short time, and safely. It is possible.

As shown in FIG. 4(b), the three elongated members 8 have electrically conductive screw holes at both ends of a conductor 8a formed by overlapping several metal flat braided wires. It has a structure in which terminal portions 8b, 8b each made of a plate material provided with a number 11 are provided.
According to such a structure, since the elongated member 8 has flexibility in addition to conductivity, both ends of the elongated member 8 can be fixed to the cable head 63a of the customer underground line 63 and the tip of the cable 10, respectively. This makes the work easier. Therefore, the work of electrically connecting the customer underground line 63 and the connection cable 10 via the elongated member 8 can be performed efficiently in a short time.
Note that the elongated member 8 is not limited to the above structure. For example, the elongated member 8 may be formed from a thin copper strip. Also in this case, since the elongated member 8 has conductivity and flexibility, the above-mentioned functions and effects are similarly exhibited.

Here, a method for temporarily supplying power using the switchgear temporary power supply box 1 will be specifically explained using FIG. 5. Note that FIG. 5 is a flowchart showing an example of the procedure of the temporary power supply method according to the present invention.
When inspecting or repairing the switch gear 52, as shown in FIG. 5, first, the supply of power to the switch gear 52 is stopped (step S1). Next, the door of the housing of the switchgear 52 is opened and the copper band 65 connecting the load-side disconnector 60b and the cable head 63a of the customer underground line 63 is removed (step S2).

After removing the door from the casing of the switchgear 52, the temporary door 3 is attached to the location where the door was attached, and the temporary power supply box 1 for the switchgear is installed (step S3 and step S4). .
Then, the three moving cables 10 connected to the mobile device in which power supply to the switchgear 52 is stopped are inserted into the housing 2 through the three through holes 4a provided in the rear surface 2b. After the insertion, the three moving cables 10 are respectively connected to the rear ends of the three connecting cables 6 (step S5).

Furthermore, both ends of the three long members 8 are connected to the cable head 63a of the customer underground line 63 and the tips of the three connecting cables 6 (step S6). As a result, the mobile device and the customer underground line 63 are brought into electrical continuity. Therefore, the mobile device is operated to supply power to the customer underground line 63 (step S7).
By using the switchgear temporary power supply box 1 in this way, even if the door of the switchgear 52 housing is not provided with an opening, the customer underground line 63 can be connected while the switchgear 52 is out of power. The work of temporarily supplying power to a customer by connecting the mobile cable 10 of a mobile device or the like to the mobile device can be safely performed in a short time.

Note that if the casing of the switchgear 52 is provided with an opening, the temporary power supply box 1 for the switchgear with the temporary door 3 removed from the casing 2 may be used, so step S3 is not necessary. This process becomes unnecessary. In this case as well, the above-mentioned functions and effects achieved by the temporary power supply method using the switchgear temporary power supply box 1 are similarly exhibited.

The temporary power supply box for switchgear of the present invention and the method for temporarily supplying power to customers using the same can be applied not only when the dedicated line supplying power to the customer is an underground line but also when it is an overhead line. It is possible.

1...Temporary power supply box for switch gear 2...Casing 2a...Front surface 2b...Rear surface 2c...Top surface 2d...Side surface 3...Temporary door 3a...Door knob 3b...Opening part 4a...Through hole 4b...Opening part 5a, 5b...Bracket 6 …Connection cable 7…Insulator 8…Long member 8a…Conductor 8b…Terminal part 9a, 9b…Holder 10…Movement cable 11…Screw hole 12…Lid 50…Distribution line 51…Main transformer 52…Switch gear 53a~ 53d... Compartment 54... Bus bar 55... Circuit breaker 56... Lightning arrester 57... Instrument transformer 58a, 58b... Power side disconnector 59a, 59b... Circuit breaker 60a, 60b... Load side disconnector 61a, 61b... 3-phase power cable 62... Overhead line 63... Underground line for customer 63a... Cable head 64... Insulator 65... Copper band 66... Bottom plate

Claims (6)

Three mobile cables connected to a three-phase AC power supply are connected to a customer underground cable installed with its tip protruding inside the switchgear to which the door with the first opening is attached. A temporary power supply box for switchgear used when temporarily supplying power to customers by connecting,
a casing having an open front surface and three through holes provided in the rear surface through which the three moving cables are respectively inserted;
three connecting cables installed inside the housing and connecting the three moving cables to the rear ends, respectively;
three elongated members having electrical conductivity and having both ends connectable to the cable head provided at the tip of the customer underground cable and the three connection cables;
and three insulators that are respectively inserted at the tips of the three connection cables,
A temporary power supply box for a switchgear, wherein the tip of the connection cable to which the elongated member is connected is covered with the insulator in addition to the casing. Power is supplied to customers by connecting three moving cables connected to a three-phase AC power source to the customer underground cable, which is installed with its tip protruding inside the switchgear to which the door is attached. A temporary power supply box for switchgear used when temporarily supplying power,
a casing having an open front surface and three through holes provided in the rear surface through which the three moving cables are respectively inserted;
three connecting cables installed inside the housing and connecting the three moving cables to the rear ends, respectively;
three elongated members having electrical conductivity and having both ends connectable to the cable head provided at the tip of the customer underground cable and the three connection cables;
three insulators that are respectively inserted at the tips of the three connection cables;
a temporary door installed on the front surface of the casing;
The temporary door has a second opening that can communicate with the front opening of the casing, and is formed so that it can be attached to the switchgear instead of the door,
A temporary power supply box for a switchgear, wherein the tip of the connection cable to which the elongated member is connected is covered with the insulator in addition to the casing. 3. The three elongated members are made of flexible conductors formed by overlapping a plurality of metal flat braided wires, according to claim 1 or 2 . Temporary power supply box for switchgear. 4. The switchgear according to claim 3 , wherein the three elongated members are each provided with a terminal portion made of a conductive plate material provided with a screw hole at both ends of the conductor. Temporary power supply box. A method for temporarily supplying power to a customer using the switchgear temporary power supply box according to claim 1, comprising:
Inserting the three elongated members into the switchgear through the first opening provided in the door of the switchgear and connecting one end thereof to the cable head of the customer underground line. Features: Temporary power supply method. A method for temporarily supplying power to a customer using the switchgear temporary power supply box according to claim 2, comprising:
The door of the switchgear is removed and the temporary door having the second opening is attached to the switchgear, and the three lengths are inserted into the switchgear from the second opening of the temporary door. A temporary power supply method characterized by inserting a length member and connecting one end thereof to the cable head of the customer underground line.

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