JPH08251733A - Transformer facilities - Google Patents

Abstract

PURPOSE: To obtain a transformer facilities, which can reduce the area of instal lation and can shorten installation period. CONSTITUTION: An oil tank 10 is provided in the protruding pattern toward the lower side surface of a stepdown transformer 14. On the upper surface of the oil tank 10, a gas insulated metal closed switchgear 1 is mounted. In front of the upper part of a case body 2 of the switchgear 1, an insulating bushing 7 is made to protrude. The central conductor of the bushing 7 is connected to an upper terminal 4b of a vacuum circuit breaker 4 for the transformer through a connecting conductor 8B, an instrument current transformer 6 and a connecting conductor 8A inside the case body 2. A lower terminal 4c of the vacuum circuit-breaker 4 for the transformer is connected to the upper end of an insulating bushing 9 through a connecting conductor 8c, a grounding circuit breaker 5 and a connecting conductor 8D. The rear end of the insulating bushing 9 is connected to the primary terminal of the neighboring stepdown transformer 14 through a connecting conductor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to substation equipment.

[0002]

2. Description of the Related Art FIG. 4 is a plan view showing an example of conventional substation equipment, and FIG. 5 is a front view of FIG. 4 showing a 66 kV transmission voltage of 6.6 kV.
A part of the substation equipment equipped with a step-down transformer that steps down to the distribution voltage is shown.

In FIG. 4 and FIG. 5, a pair of steel towers 30A, 30B are erected on the substation equipment.
A tower 30C is erected on the right side of B. this house,
A steel beam 31A is horizontally installed between the steel towers 30A and 30B on the left side. On the upper ends of the steel towers 30A, 30B and the steel tower 30C, an iron wire 32 for a lightning rod is installed so as to be slightly inclined as shown in FIG.

A steel beam 31B is provided in the front-rear direction above the leftmost steel tower 30A. The right end of the insulator 33 is locked on the left side of the upper end of the iron beam 31B, and the right end of the service wire 34 connected to a 66 kV power transmission line (not shown) is fixed to the left end of the insulator 33.

On the lower surface at the center of the iron beam 31A, a suspension insulator 36, which has not been described in detail, is vertically provided for three phases. These suspended insulators
At the lower end of 36, a common bus bar 37 provided in the front-rear direction is installed. To this common bus 37, a lightning arrester and an instrument transformer (not shown) are connected.

Between the left steel towers 30A and 30B, a line breaker 35A is installed on the right side of the left steel tower 30A. This line breaker 35A is projected on the upper left side of the
The lower end of the connection electric wire 34a is connected to a power supply side terminal (not shown) provided on the upper end of the bushing. The middle portion of the connecting wire 34a is supported by the lower end of an insulator suspended under the iron beam 31B, and the left end of the connecting wire 34a is connected to the lower end of the lead-in wire 34 described above.

A load side terminal (not shown) provided on the upper end of the bushing projecting from the upper right side of the circuit breaker 35A is connected to the above-mentioned common bus bar 36 by a connecting electric wire 36a. Below the center of the iron beam 31A, the single-pole disconnectors 38 for three phases are installed. One side of these disconnectors 38 is connected to each common bus 36 via a connection power supply 36b.

FIG. 6 is a partially enlarged detailed view of FIG. 4, and FIG. 7 is
FIG. 6 is a partially enlarged detailed view of FIG. 5. 4 to 7,
On the right side of the circuit breaker 35A, a transformer circuit breaker 35B having a smaller capacity than the circuit breaker 35A is symmetrically installed so as to sandwich the common bus 37 in FIG.

An instrument current transformer 39 is attached to the lower end of a bushing 35b protruding from the upper left side of the transformer breaker 35B. The terminal at the upper end of the bushing 35b is connected to the load side of the disconnector 38 by a connecting wire.

On the right side of the transformer breaker 35B, a step-down transformer 40 for stepping down the voltage of 66 kV to 6.6 kV is installed.
The right end of the connecting electric wire 40b is connected to the terminal at the upper end of the bushing 40a provided on the left side of the step-down transformer 40, and the left end of the connecting electric wire 40b is the upper end of the bushing on the load side of the transformer breaker 35B. It is connected to the.

At the upper end of the step-down transformer 40, there is mounted a conservator 41 in which transformer oil is stored as insulating oil. A cooler 42 is shown on the front and rear sides of the step-down transformer 40 in FIG.

On the right side of the cooler 42 on the front side of the step-down transformer 40, a live line oil purifier 43 is shown with a door showing an open state by a broken line, and on the right side of the live line cleaner 34. The operating mechanism 44 of the load tap changer is also shown by a broken line together with the door that is in the open state.

Further, a cable duct 45 is erected on the right side of the operating mechanism 44. At the upper end of the cable duct 45, a bushing forming a secondary side terminal portion of the step-down transformer 40 is provided so as to project backward by three phases as shown in FIG.

The cable duct 45 is connected to the upper end of a high-pressure cross-linked polyethylene cable (not shown) raised from a pit (not shown) formed at the lower end of the cable duct 45 via a crimp terminal (not shown). On the right side of the cable duct 45, a door 45a for installation work for connecting the high-voltage cross-linked polyethylene cable to the bushing is shown in an open state of a broken line.

[0015]

However, in the substation equipment constructed as described above, since each equipment is installed around each equipment through a predetermined maintenance space, the substation equipment is installed. The floor space required for

In addition, a transformer circuit breaker 35 and a step-down transformer 40
Since the charging part such as the connection power supply 4b for connecting to is exposed, there is a safety concern during maintenance and inspection work. Further, in the installation work, the work for connecting the main circuit and the control circuit of each device is performed, so that not only the installation period becomes long, but also the time for inspecting these connection parts is required. Then, the objective of this invention is reducing the installation area, and obtaining the substation equipment which can shorten an installation construction period.

[0017]

In the substation equipment of the present invention, a metal-closed switchgear having a vacuum circuit breaker accommodated therein is mounted on an upper portion of a connection box provided on a side surface of a high-voltage transformer. Is characterized by.

The metal closed switchgear is preferably a gas-insulated metal closed switchgear, and
An insulating bushing connected to a vacuum circuit breaker housed inside the box body may be provided in a protruding manner on the top of the box body of the metal closed switchgear. Further, it is preferable to inject insulating oil into the connection box, or insulating gas may be filled.

[0019]

[Operation] The installation work of the metal closed type switchgear mounted in the junction box is not required in the field, and the main circuit and the control circuit connecting the metal closed type switchgear and the high voltage transformer are directly connected without passing through the pit. You can connect.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the substation equipment of the present invention will be described below with reference to the drawings. 1 is a plan view showing an embodiment of the substation equipment of the present invention, a view corresponding to FIG. 6 shown in the prior art, FIG. 2 is a front view of FIG. 1, and a view also corresponding to FIG. Is. Further, FIG. 3 is a detailed view of a partially enlarged vertical cross section of FIG.

1, FIG. 2 and FIG. 3 are substantially different from FIG. 6 and FIG. 7 shown in the prior art in that the step-down transformer 14 having substantially the same shape as the step-down transformer 40 shown in FIG. 6 and FIG.
The gas-insulated metal closed type switchgear 1 described later with reference to FIG. Therefore, in the step-down transformer 14, the same elements as those of the conventional step-down transformer 40 are designated by the same reference numerals and the description thereof will be omitted.

That is, in FIGS. 1, 2 and 3, the step-down transformer 10 is provided at the lower left end of the step-down transformer 14.
An oil tank 10 serving as a connection box for connecting the primary side of the gas-insulated metal closed switchgear 1 is attached. This oil tank
Reference numeral 10 has a watertight welded structure, including the shaped steel forming the outer edge of the outer periphery, and has a strong structure, and a lid is attached to the front surface side through packing (not shown). Transformer oil as insulating oil 11 is injected into the oil tank 10 after the installation is completed.

On the upper surface of the oil tank 10 is mounted a gas insulated metal closed switchgear 1 having a standard height of 2300 mm, the details of which are shown in FIG. This gas insulated metal closed switchgear 1
3, a door 2a is provided at the front end of the box body 2 as shown in the vertical sectional view of FIG. On the front side of the middle part of the box 2,
A partition wall 2b that vertically divides the box body 2 is provided vertically, a low-pressure chamber 2c is formed in front of this partition wall 2b, and a gas insulating chamber 2d is formed behind the partition wall 2b. This gas insulation room 2
Sulfur hexafluoride gas as an insulating gas is enclosed in d.

An unillustrated rectangular opening is formed in the upper part of the partition wall 2b, and the operating mechanism 3 of the transformer vacuum circuit breaker 4 is airtightly attached to the opening from the front.

At the rear of the operating mechanism 3, a high voltage part of the transformer vacuum circuit breaker 4 is provided so as to project toward the gas insulation chamber 2d, and the operating rod 4a at the lower end of the transformer vacuum circuit breaker 4 is operated by the operating mechanism 3 Is connected to the bottom of.

A grounding disconnector 5 is attached to the lower part of the transformer vacuum circuit breaker 4, and an operating mechanism 3 for the grounding disconnector 5 is installed.
The low pressure chamber 2c of the grounding disconnector 5 is provided at a.
An instrument current transformer 6 is fixed to the upper portion of the transformer vacuum circuit breaker 4. Further, the insulating bushings 7 are attached to the three inclined surfaces formed on the front side of the upper end of the box body, with their tips inclined forward.

The terminal ends 7a of the insulating bushings 7 are connected to the rear ends of the connecting electric wires 40b as shown in FIGS. 1 and 2, and the front ends of these connecting electric wires 40b are shown in FIGS. It is connected to the load side of the disconnector 38 shown by.

The lower end of the central conductor of the insulating bushing 7 is connected to the upper end of a connecting conductor 8B bent in a mountain shape from a copper rod. The lower end of the connection conductor 8B is connected to the upper terminal 6a of the instrument current transformer 6.

At the lower terminal 6b of the instrument current transformer 6,
The upper end of the short connecting conductor 8A is connected, and the connecting conductor 8A
Is connected to the upper terminal 4b of the transformer vacuum circuit breaker 4.

Also, the lower terminal 4 of the transformer vacuum circuit breaker 4
The upper end of the connecting conductor 8C is connected to c, and the lower end of the connecting conductor 8C is connected to one side of the terminal 5b at the rear end of the grounding disconnector 5.

The other end of the terminal 5b is connected to the upper end of a connecting conductor 8D which is curved in a substantially J-shape, and the connecting conductor 8D is formed.
The lower end of is connected to the upper terminal 12a of the insulating spacer 12 which is provided at the bottom of the box body 2.

The central conductor of this insulating spacer 12 is L
The upper part of the insulating bushing 9 formed in a letter shape is connected. The terminal 9 protruding from the rear of the insulating bushing 9
The front end of a connection conductor (not shown) is connected to a, and the rear end of this connection conductor is connected to the primary side terminal of the step-down transformer 14 shown in FIGS. 1 and 2.

In the substation equipment constructed in this manner, the installation floor area including the maintenance space occupied by the transformer circuit breaker 35B and the step-down transformer 40 shown in FIGS. In comparison, since the step-down transformer 14 and the gas-insulated closed type switchgear 1 can be installed on the installation surface of about 60% of the area, the installation area of the substation equipment can be significantly reduced.

Similarly, the gas-insulated metal closed type switchgear 1 is attached to the step-down transformer 14 via the oil tank 10, so that the installation work can be omitted. Further, since the gas-insulated metal closed switchgear 1 and the step-down transformer 14 are connected by the insulating bushing 9 and can be connected at the assembly plant, the installation work on site can be reduced.

Similarly, the gas-insulated metal closed switchgear 1 and the low-voltage electric wire of the signal circuit of the step-down transformer 14 can be directly connected via a wiring duct such as a metal pipe.
It is possible to shorten the connection period at the installation site.

Also, a connecting wire 40b for connecting to the disconnector 38
Can be connected via an insulating bushing 7 protruding from the upper portion of the gas-insulated metal closed switchgear 1, so that the height of the insulating bushing 7 up to the tip can be reduced.
Insulation bushing 7 without the restriction of height limitation on transportation
Can be transported with the attached.

Further, since the main circuit connection between the step-down transformer 14 and the gas-insulated metal closed type switchgear is made inside the oil tank 10, the exposed portion of the charging part is reduced, so that the safety at the time of maintenance / inspection is ensured. You can also raise it.

In the above embodiment, the gas-insulated metal closed switchgear 1 is described as an example in which it is connected through the oil tank 10 fixed to the lower side surface of the step-down transformer 14, but the oil tank 10
In place of the above, a gas compartment containing an insulating gas may be used, and sulfur hexafluoride gas may be enclosed in the same manner as the insulating gas chamber 2d of the box 2.

Further, in the above-mentioned embodiment, an example in which the invention is applied to the step-down transformer and the transformer circuit breaker installed in the substation equipment has been described, but the same can be applied to power receiving equipment such as factories and buildings.

[0040]

As described above, according to the present invention, a metal-closed switchgear having a vacuum circuit breaker accommodated therein is mounted on an upper portion of a connection box provided on a side surface of a high-voltage transformer to connect the high-voltage transformer. Since there is no need for on-site installation work for the metal closed switchgear mounted in the box, and the main circuit and control circuit that connect the metal closed switchgear to the high-voltage transformer can also be directly connected without going through the pit. Therefore, it is possible to obtain the substation equipment that can reduce the installation area and the installation period.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of substation equipment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is an enlarged vertical sectional view showing a main part of FIG.

FIG. 4 is a plan view showing an example of conventional substation equipment.

5 is a front view of FIG.

FIG. 6 is a partially enlarged detailed view of FIG.

FIG. 7 is a front view of FIG.

[Explanation of symbols]

1 ... Gas-insulated metal closed switchgear, 2 ... Box body, 3 ...
Operation mechanism section, 4 ... Transformer vacuum circuit breaker, 5 ... Ground disconnecting switch, 6 ... Instrument current transformer, 7, 9 ... Insulating bushing, 8
A, 8B, 8C, 8D ... Connection conductor, 10 ... Oil tank, 11 ... Insulating oil, 12 ... Insulating spacer, 14 ... Step-down transformer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Osamu Sakaguchi No. 1 in Toshiba Fuchu factory, Fuchu-shi, Tokyo (72) Inventor Tomio Go Go No. 1 in Toshiba town, Fuchu-shi, Tokyo Toshiba Fuchu factory ( 72) Inventor Nobuo Masaki 1st Toshiba Town, Fuchu-shi, Tokyo Inside Toshiba Fuchu Factory (72) Inventor Hiroshi Sonobe 2121 Nawao, Asahi-cho, Mie-gun, Mie Prefecture Toshiba Mie Factory

Claims (5)

[Claims] 1. A substation facility in which a metal-closed switchgear having a vacuum circuit breaker accommodated therein is mounted on an upper portion of a connection box provided on a side surface of a high-voltage transformer. 2. The substation equipment according to claim 1, wherein the metal-closed switchgear is a gas-insulated metal-closed switchgear. 3. An insulating bushing connected to a vacuum circuit breaker housed inside the box body of the metal-closed switchgear is projectingly provided on an upper portion of the box body.
Alternatively, the substation equipment according to claim 2. 4. The substation equipment according to claim 1, wherein insulating oil is injected into the connection box. 5. The substation equipment according to claim 2, wherein insulating gas is introduced into the connection box.