JPH0635609Y2 - Spot network power transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a spot network work power receiving and transforming apparatus suitable for power receiving equipment for buildings and the like.

[Conventional technology]

In recent years, with the rapid increase in power consumption in buildings in large cities, etc., while the capacity and voltage of power receiving equipment for buildings have increased, high reliability and safety have been required. However, for such power receiving equipment, a spot network power receiving system, which has extremely high supply reliability and safety, has been widely adopted.

This spot network work power receiving system will be explained in the case of a low voltage spot network work, as shown in FIG.
For example, 2 drawn from the substation (A) of an electric power company
1 for each of 4 lines (3 lines in the figure) of distribution line (L)
Connect the network transformer (TR) through the secondary disconnector (DS), and connect the secondary side of each transformer (TR) through the protector fuse (F) and the protector circuit breaker (CB). ) Is connected in parallel, and power is supplied to each load via a plurality of take-off devices (TO) branched from the bus (B).

According to this power receiving method, since each transformer (TR) is always connected in parallel on the secondary side, work stoppage of an arbitrary distribution line (L), accident, or stoppage of a transformer (TR), accident may occur. However, the remaining distribution lines (L) unrelated to these stoppages and accidents
It is possible to continue to receive electricity from, and the supply reliability is high.

The conventional spot work work power receiving and transforming device that operates by this type of power receiving system is configured as shown in FIGS.

That is, the switchgear (4) accommodating the air type primary disconnector (3) is installed near each of the three network transformers (2) arranged in the electric room (1), and The cable head (6) of the power receiving cable (5) branched and connected to the electric wire is connected to the power supply side terminal of the disconnector (3) on the upper surface of the switchgear (4), and the load side terminal of the disconnector (3). Is connected to the primary side terminal of the transformer (2) through the transformer primary bus duct (7).

Also, on the side opposite to the switchgear (4) of the transformer (2),
For example, a protector device (9) accommodating a protector breaker (8) is installed back to back on the wall of the electric room (1), and the secondary side terminal of the transformer (2) and the power supply of the breaker (8) are installed. The side terminal is connected via a conductor in a transformer secondary bus duct (10) that connects the transformer (2) and the protector device (9).

Further, on both sides of each protector device (9), a take-off device (11) accommodating a circuit breaker for wiring is provided, and the protector device (9) and the take-off device (11) are installed in a row board and A network busbar (12) penetrating the devices (9) and (11) is connected to the load side terminal of the circuit breaker (8) in each protector device (9).

In addition, (13) is a radiator attached to the surface of the transformer (2) opposite to the switchgear (4). Further, the protector fuse is integrated in the transformer (2), for example.

[Problems to be solved by the invention] By the way, the protector device (9) is provided with a power direction relay, and a power failure or an accident of the distribution line is detected based on the measured current and voltage of the current transformer and the transformer for the meter. Although it is configured to automatically shut off the protector circuit breaker (8) by detecting the reverse power due to, the voltage at that point is almost the same as for the three-phase complete short-circuit accident on the secondary side of the transformer (2). Since it decreases to zero, the relay does not operate, and in this case, even the protector fuse of the healthy line including the protector fuse of the accidental line is melted down, and there is an inconvenience of causing a complete stop.

That is, in this type of network work substation, it is difficult to detect a fault in the conductor between the secondary side terminal of the transformer (2) and the protector circuit breaker (8) due to the protective relay system, and power supply is difficult. This is a weak point for reliability, and it is necessary to design and manufacture insulation so that accidents do not occur in this part as much as possible.

However, in the conventional power receiving and transforming device, the transformer (2),
Since the switchgear (4) and the protector (9) are separately installed and connected by the bus ducts (7) and (10), the transformer (which is a weak point in the above-mentioned protective relay system). The secondary side conductor of 2) is considerably long and has many connection points, which easily causes an accident in this portion, and has a drawback of poor supply reliability.

Further, the transformer (2), the switchgear (4), and the protector device (9) are separately installed, so that the installation space is increased, and furthermore, the switchgear (4), the bustact (when installing such a device). 7), the transformer (2), the bus duct (10) and the protector device (9) have to be assembled once at the factory, disassembled during transportation and then reassembled on site, which makes the installation period very long. is there.

As a result, material / manufacturing costs, transportation costs, local installation costs, and adjustment costs are all high, which leads to an increase in total costs.

In the case of the high-voltage spot network work, the protector fuse is omitted and the protector breaker is operated and controlled by using the overcurrent relay, but it has the same problem as described above.

This invention was made with the above points in mind,
It is intended to provide a means capable of improving the supply reliability, shortening the installation period, reducing the total cost, and reducing the installation space.

[Means for solving problems]

The device for receiving and transforming a network of spotwork according to this invention is
A wide, thin spot network work transformer with a set of power receiving and transforming equipment installed on the front side of the base, a pedestal integrally provided at the lower front of the transformer, and a pedestal supported by the pedestal. A switchgear directly integrated with the switchgear, a primary disconnector housed in the switchgear and having a power supply side terminal connected to a power receiving cable, and a transformer connected to a load side terminal of the disconnector. A wide side and thin type protector device installed on the rear side of the transformer and on the rear side of the base and directly integrated on the rear surface of the transformer, and the load side terminal is housed in the protector device and is connected to the network busbar. The protector circuit breaker connected, the secondary side terminal of the transformer connected to the power source side terminal of the circuit breaker, and the heat radiator arranged on both side surfaces of the transformer, Place multiple sets in the left-right direction and And protector device, the wide installed on the side surface of the respective protector device, in which the respective take-off device of thin placed panel array.

[Action]

In this invention, a pair of power receiving and transforming equipment has a switchgear linearly integrated with one surface of a spot network transformer, and a protector installed on the other base of the transformer together with the transformer on a common base. Since the devices are directly integrated, multiple sets of power receiving and transforming devices are arranged in the left-right direction, and each protector device and the take-off device installed on each side of the device are arranged in a row, eliminating the need for conventional bus ducts. In addition, the secondary conductor of the transformer is shortened to the maximum, and moreover, this type of power receiving and transforming equipment can be transported and installed in a batch, and the installation space is greatly reduced.

〔Example〕

Next, the present invention will be described in detail with reference to FIGS. 1 to 3 showing the first embodiment. The same symbols as those used above indicate the same or corresponding ones.

1 to 3, a point different from the conventional one is that a primary gas disconnector (3) is provided on one surface of a spot network transformer (2) such as a gas-insulated transformer installed on a base (14). The switchgear (4) accommodating is supported directly on the platform (15) integrated with the transformer (2) and integrated,
The protector device (9) installed on the base (14) is directly integrated with the other surface of the transformer (2),
The bus duct between the switchgear (4) and the transformer (2) is omitted, and the load side terminal of the disconnector (3) and the transformer (2) are connected.
The secondary terminal is connected in the switchgear (4),
When the bus duct between the transformer (2) and the protector device (9) is omitted, and the secondary side terminal of the transformer (2) and the power source side terminal of the protector circuit breaker (8) are low-voltage spot network. Are connected via a protector fuse in the case of a high-voltage spot network directly in the protector device (9).

In this case, the protector device (9) is formed so that its width dimension is substantially the same as that of the transformer (2) and the depth dimension is suppressed, and the depth dimension of each take-off device (11) is set accordingly. These devices (9) and (11) are installed in rows.

Further, the transformer (2) has radiators (13) arranged on the other two surfaces of the one surface and the multi-sided surface, and various instruments, switches, handholes are located on the one surface at a position avoiding the switchgear (4). Etc. are arranged so that maintenance and inspection of the transformer (2) can be performed from only one side.

Therefore, according to the above-described embodiment, the switchgear (4), the transformer (2), and the protector device (9) are directly connected to each other without using a conventional bus duct. Due to the protective relay method of the seed power receiving and transforming device,
The secondary conductor of the transformer (2), which is the part where the failure is difficult to detect, is shortened to the utmost limit, and the occurrence of an accident in this part is suppressed as much as possible, and the supply reliability is dramatically improved.

Further, since the switchgear (4) is mounted on one surface of the transformer (2) and the transformer (2) and the protector device (9) are directly integrated on a common base (14), Not only will the installation space be greatly reduced, but this type of power receiving and transforming device can be transported and installed in a batch.

[Effect of device]

As described above, according to the spotwork work substation of the present invention, since the switchgear and the protector device are directly integrated on one side and the other side of the spotwork work transformer, respectively, the transformer secondary-side conductor is limited. It is possible to reduce the occurrence of an accident on the secondary side of the transformer, which is the weak point of this type of power receiving and transforming device, and to improve the reliability of supply. Furthermore, it is directly integrated with the transformer. Since the protector device and the protector device are installed on a common base, it is possible to carry out collective transportation and collective installation, which can greatly reduce the installation period and reduce the installation space.
At the same time, the total cost such as material / manufacturing cost, transportation cost, local installation cost and adjustment cost can be reduced.

[Brief description of drawings]

1 to 3 show one embodiment of a spot network work power receiving and transforming device of the present invention. FIG. 1 is a side view, FIG. 2 is a single line diagram of essential parts, and FIG. 3 is a plane view of FIG. Fig. 4 and Fig. 4 are single line system diagrams of general spot network power receiving system, 5
The following figures show a conventional power receiving and transforming device, FIG. 5 is a side view, FIG. 6 is a partial single-line diagram, and FIG. 7 is a plan view. (2) …… Spot network work transformer, (4) …… Switching device, (9) …… Protector device, (14) …… Base.

Claims (1)

[Scope of utility model registration request] 1. A wide and thin spot network work transformer in which a pair of power receiving and transforming equipment is installed on a front side of a base, a pedestal integrally provided on a lower portion of a front surface of the transformer, and the pedestal. Is connected to the transformer, the switchgear directly integrated with the transformer, the primary disconnector housed in the switchgear, the power source side terminal of which is connected to the power receiving cable, and the load side terminal of the disconnector. A primary side terminal of the transformer, a wide and thin protector device installed on the rear side of the base and directly integrated on the rear surface of the transformer, and a protector device housed in the load side. A protector circuit breaker whose terminal is connected to the network bus, a secondary side terminal of the transformer connected to a power supply side terminal of the circuit breaker, and a radiator arranged on both sides of the transformer. Multiple sets of the power receiving and transforming equipment are arranged in the left-right direction. A spot work work power receiving and transforming device in which the protector devices and the wide and thin take-off devices installed on the side surfaces of the protector devices are arranged in rows.