JP3120484B2 - Substation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power receiving and transforming apparatus, and more particularly, to a gas insulated switchgear of an extra-high power receiving and transforming facility for private use.

[0002]

2. Description of the Related Art A conventional high power receiving and transforming apparatus for private demand comprises a power receiving section of two circuits, a transformer for current meter (MOF) for measuring supply power, and two transformers for receiving supplied power. A so-called two-line power receiving 1MOF2 bank type power receiving and transforming system is generally used.

In order to reduce the installation area of the power receiving and transforming device, there is, for example, a device disclosed in Japanese Patent Application Laid-Open No. 1-303002.

[0004]

In the above-mentioned conventional power receiving and transforming apparatus for civil use, a system configuration in which a circuit breaker is not provided on the primary side of the transformer, that is, between the transformer and the transformer for the instrument. Therefore, when a failure occurs in the transformer, the power supply must be stopped by opening the circuit breaker provided on the power receiving side by the command signal.

[0005] As a result, the entire customer who uses the electric power is cut off, and the reliability of the electric power supply is significantly reduced.

As a countermeasure, a power receiving and transforming system in which a circuit breaker is also provided on the primary side of each transformer has been considered. When this power receiving and transforming system is configured, a circuit breaker is provided on the primary side of the transformer. By adding, the size of the whole device becomes large, and it is necessary to disassemble each device at the time of transportation.

An object of the present invention is to provide a power receiving and transforming device which can be integrally transported and has high reliability in power supply even in a two-line power receiving and two-bank private power receiving and transforming device in which a breaker is installed on the primary side of a transformer. Is to do.

[0008]

According to the present invention, in order to achieve the above object, the present invention relates to a power receiving / transforming apparatus for supplying electric power supplied from two lines to respective transformers through a transformer / current transformer for an instrument. A first circuit breaker on the primary side of the transformer is arranged on both sides of the current transformer, and a second circuit breaker on the power receiving side is arranged on both sides of the first circuit breaker. And a voltage transformer for an instrument is connected to the back of the circuit breaker by a conduit connection.

[0009]

According to the power receiving and transforming apparatus of the present invention, the provision of the circuit breaker on the primary side of the transformer disconnects the transformer in which the accident has occurred from the power receiving side, so that only the demand side connected thereto is cut off. In addition to minimizing the spillover caused by the above-mentioned accident, even if the primary and transformer circuit breakers are arranged on both sides of the current transformer for the instrument, it can be accommodated in the transport limit dimensions, Integrated transportation by trailer is possible.

[0010]

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

FIG. 1 to FIG. 5 show an embodiment of a power receiving and transforming apparatus according to the present invention. The embodiment will be mainly described. In this figure, reference numeral 1 denotes an instrument transformer provided by a power company. A first circuit breaker 2 on the primary side of the transformer is juxtaposed on both sides of the voltage transformer 1 for an instrument. Further, on both sides of the first circuit breaker 2, the second circuit breakers 3 on the power receiving side are juxtaposed. The input side of the second circuit breaker 3 is connected to a power receiving unit 5 via a conduit connection unit 4 having a grounding switch 4B and a lightning arrester disconnector 4C in a container 4A as shown in FIGS. doing. The power receiving unit 5 includes a current transformer 5B, a cable head 5C, and a ground switch 5D in a container 5A. The output side of the second circuit breaker 3 is connected to a conduit connection section 6 provided with a disconnecting switch 6B and a grounding switch 6C in its container 6A. The lightning arrester 7 is connected to the lightning arrester disconnector 4C of the above-mentioned conduit connection section 4.

The above-described first circuit breaker 2 is shown in FIGS.
As shown in the figure, a conduit connection portion 8 having a container 8A on its input side and a disconnector 8B and a grounding switch 8C provided therein.
At the output side and a disconnector 9 provided inside the container 9A.
B and a transformer connecting portion 9 having a cable head 9C. This transformer connection 9 is connected to a transformer 10.

The above-described instrument transformer 1 includes a movable container 1A as shown in FIG. 1 and FIG.
The transformer main body 1B housed in the power transformer main body, and conductors 1C and 1D connected to the transformer main body 1B are provided. These conductors 1C and 1D are the conductors 1 of the conduit connection portion 11, respectively.
1A and 11B. The conductor 11A of the conduit connection part 11 is the conductor 12A in the lower conduit connection part 12, and the conductor 11B is the conductor 1A in the upper conduit connection unit 13.
3A.

The above-mentioned pipeline connection section 12 is connected to the pipeline connection section 8 connected to the first circuit breakers 2 on both sides as shown in FIG. In addition, the pipe connection section 13 is also connected to the pipe connection section 4 connected to the second circuit breakers 3 on both sides as shown in FIG. These pipe connection parts 12 and 13 are arranged in the same plane as shown in FIG. 4 behind the first circuit breaker 2 and the second circuit breaker 3 as shown in FIG. The container of each device described above is filled with an insulating gas.

[0015] The power receiving and transforming apparatus configured as described above can reduce its installation area. That is, as shown in FIG. 1, the width dimension W and the depth dimension D are determined by the box-shaped configuration of the first circuit breaker 2 and the second circuit breaker 3 arranged on both sides of the voltage transformer for instrument 1. The dimensions are reduced and can be within the transport limit dimensions. It is also possible to transport this device integrally by a trailer. Furthermore, since the operation surfaces of the first and second circuit breakers 2 and 3 and the extraction surface of the transformer for current transformer 1 are arranged on the same plane,
Maintenance inspection is easy.

Next, the first and second circuit breakers 2,
An example of the detailed configuration of No. 3 will be described with reference to FIGS.

The three phases of the breaking section 15 in each of the circuit breakers 2 and 3 are installed in parallel on a molded insulating case 16 as shown in FIG. The mold insulating case 16 is supported and fixed to a mounting plate 18 via an O-ring 17. The O-ring 17 seals the insulating gas in the sealed container 19.

As shown in FIG. 8, a conductor 20 is attached to the fixed contact 15A of the breaking section 15. A conductor 22 is connected to the support 21 on the movable side of the blocking unit 15. This support 21 has a puffer piston 23
Has been fixed. The puffer cylinder 24 is connected to the operating device system on the air side via the insulating operation rod 25 and the airtight portion of the rotary lever 26. As shown in FIG. 7, this operating device system includes a shut-off spring 27, a closing spring 28, and an oil dash pot 29 for braking at the end of the closing and closing operations.
However, the blocking spring 15, the closing spring 28, and the oil dash pot 29, which are the three elements of the drive system, are also arranged in parallel on the atmosphere side of the mounting plate 18 and in parallel with the blocking portion 15. The closing spring 28 is held by a closing hook 32 via a link system 31 in a hoisting and compressed state by an electric motor 30 and a gear. When the closing hook 32 shown in FIG. 8 is disengaged, the spring force of the closing spring 28 is released and the link system 2 is released.
4, the puffer cylinder 24 is operated in the closing direction. At the time of this closing operation, the spring force of the closing spring 27 is set to be greater than the spring force of the blocking spring 27 in order to force the shut-off spring 27 by the spring force of the closing spring 28. The breaking operation is shown in FIG.
By releasing the engagement of the trip hook 33 shown in FIG. 7, the blocking spring 27 is released, and the puffer cylinder 24 is driven via the link system 31 in the trip direction.

As shown in FIG. 7, a breaker control relay 34, an auxiliary switch 35, a plug-in type terminal block 36, and the like are also installed on the mounting plate 18 so as to implement a function as a breaker. Equipped with a class. As shown in FIG. 9, a closing spring 28 having a larger force than the spring force of the cut-off spring 27 is attached in parallel with the longitudinal direction of the mounting plate 18. Is installed in a direction to cancel the deformation due to the internal pressure P.

Since the operating device installed on the atmosphere side is inside the box-shaped container 37, maintenance and inspection can be performed by opening the door on the front of the container 37, and further, when the shut-off portion 15 is inspected or replaced, If you want to take out the entire breaker all at once,
By separating the plunge-in type terminal block 36,
This can be achieved by pulling out the mounting plate 18 without moving or removing other equipment constituting the gas insulated switchgear.

As described above, the circuit breaker does not require the inspection space on the side and rear of the circuit breaker for maintenance and inspection, and the power receiving section and the transformer connection section can be installed in a row-panel system.

Next, the operation of one embodiment of the above-described power receiving and transforming apparatus of the present invention will be described.

In the above-described power receiving and transforming apparatus, the interrupting section 15 of the second circuit breaker 3 on one power receiving side is normally open, and is in a standby state as a spare. For this reason, the electric power supplied from the electric power company through the other line is supplied from the power receiving unit 5 to the transformer for current transformer 1 for an instrument. Then, the electric power after the measurement of the electric power to be used in the transformer for current transformer 1 is supplied to the transformer 10 through the first circuit breaker 2. In this state, for example, if one of the transformers 10 breaks down, the cut-off part 15 of the first circuit breaker 2 on the primary side is opened, and the power supply to the one transformer 10 is cut off. Power supply to the transformer 10 is continued. For this reason, it is possible to prevent the entire power supply to the entire customer from being stopped, and to minimize the trouble.

Further, in one embodiment of the present invention, even if the first circuit breaker 2 on the primary side of the transformer is installed, the width and depth of the first circuit breaker 2 can be kept within the transport limit and integrated. Because of this, trailer transport is also possible, and pit construction for installation is not required, and the construction period can be significantly reduced.

In the above-described embodiment, the interrupting section 15 of the circuit breakers 2 and 3 is configured as a puffer type interrupting section, but may be configured as a vacuum interrupting section 38 as shown in FIG. Even with such a configuration, the same effect as that of the above-described embodiment can be obtained.

In the above-described embodiment, the power receiving unit 5 is of a cable power receiving type. However, as shown in FIGS.
It is also possible to constitute a power receiving unit using the bushing 39.

With this configuration, the same effects as those of the above-described embodiment can be obtained, and since the power receiving unit 5 is arranged on the side in the width direction, necessary even if it becomes an air bushing. Interphase dimensions can be maintained. Further, only the portion including the container of the lead-in portion for attaching the bushing is changed, and there is no need to change other components, and the power receiving type can be easily changed and standardization can be achieved.

FIGS. 13 and 14 show another embodiment of the power receiving and transforming apparatus according to the present invention. In these figures, the same reference numerals as those in FIGS. 1 to 5 denote the same or corresponding parts. In this embodiment, the lightning arrester 7 is installed below the second circuit breaker 3.

With such a configuration, the depth dimension of the apparatus can be further reduced. As a result, the attachment area can be reduced. Furthermore, it can be applied to deep underground substations where the installation area is limited in the future. In this case, since the cable is drawn in, the lightning arrester at the drawn-in portion becomes unnecessary.

FIGS. 15 to 18 show still another embodiment of the power receiving and transforming apparatus according to the present invention.
1 to 5 are the same or corresponding parts. In this embodiment, the pipeline connection portions 12 and 13 in the embodiment shown in FIG. 1 are constituted by one pipeline connection portion 38, and the conductors 12A and 13A are accommodated in the pipeline connection portion 38.

With this configuration, the same effects as those of the above-described embodiment can be obtained, and the number of parts can be reduced and the weight can be reduced.

As described above, according to the embodiment of the present invention, the circuit breaker and the operating device of the circuit breaker are housed in the box-shaped container, so that maintenance and inspection can be performed from the front. Further, the space for maintenance and inspection conventionally provided on both sides of the circuit breaker becomes unnecessary. Further, since the power receiving unit and the transformer connecting unit are provided at the back of each circuit breaker configured in a row, the width of the device can be reduced. Further, by forming the circuit breaker container in a box shape, the dimension in the depth direction can be reduced. As a result, it can fit within the transport limit dimensions,
In addition to being able to be transported together, pit construction work at the time of installation is not required, and the construction period can be significantly reduced.

[0033]

As described above, according to the present invention, by providing a circuit breaker on the primary side of a transformer, it is possible to provide a two-line power receiving 1 MOF two bank type power receiving and transforming device with high power supply reliability. In addition to being able to transport together, pit construction work during installation is not required,
The construction period can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a power receiving and transforming apparatus of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along line CC of FIG. 1;

FIG. 5 is a sectional view taken along line DD of FIG. 1;

FIG. 6 is a cross-sectional plan view of a circuit breaker used in the device of the present invention.

FIG. 7 is a view taken along line EE in FIG. 6;

FIG. 8 is a sectional view taken along line FF of FIG. 6;

FIG. 9 is a sectional view taken along line GG of FIG. 6;

FIG. 10 is a longitudinal sectional side view showing another example of the circuit breaker used in the device of the present invention.

FIG. 11 is a plan view showing another embodiment of the device of the present invention.

FIG. 12 is a left side view of FIG. 11;

FIG. 13 is a plan view showing still another embodiment of the device of the present invention.

FIG. 14 is a left side view of FIG.

FIG. 15 is a plan view showing another embodiment of the device of the present invention.

FIG. 16 is a view taken along the line HH in FIG. 15;

FIG. 17 is a view taken along line II of FIG. 15;

18 is a view taken along line JJ of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transformer / current transformer for instrument, 2 ... 1st circuit breaker, 3 ... 2nd circuit breaker, 4, 6, 8, 11, 12, 13, 38 ... Line connection part, 5 ... Power receiving part, 7 ... lightning arrester, 9 ... transformer connection, 1
0 ... Transformer, 15 ... Interruption part.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Noriyuki Tetsu, 1-1-1, Kokubuncho, Hitachi, Ibaraki Prefecture Inside the Kokubu Plant of Hitachi, Ltd. (72) Sadao Izumi, 1-1-1, Kokubuncho, Hitachi, Ibaraki No. 1 In the Kokubu Plant of Hitachi, Ltd. (56) References JP-A-5-22816 (JP, A) JP-A 61-74212 (JP, U) JP-A 58-9919 (JP, U) 58-1916 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02B 5/00 H02B 1/18 H02B 13/02

Claims (6)

(57) [Claims] 1. A power receiving / transforming apparatus for supplying power supplied from two lines to a transformer through a transformer for an instrument, and a first transformer on a primary side of a transformer on both sides of the transformer for an instrument. And a second circuit breaker on the power receiving side disposed on both sides of the circuit breaker. The circuit breaker, the power receiving unit, the transformer connection unit, and the transformer for current metering are connected at the back of the circuit breaker. A power receiving and transforming device connected by a road connection unit. 2. A power receiving / transforming device for supplying power supplied from two lines to a transformer through a transformer for an instrument, and a first transformer on a primary side of a transformer on both sides of the transformer for an instrument. And a second circuit breaker on the power receiving side disposed on both sides of the circuit breaker. The circuit breaker, the power receiving unit, the transformer connection unit, and the transformer for current metering are connected at the back of the circuit breaker. A first and a second circuit breaker, wherein the first and second circuit breakers are housed in a box-shaped container in which the circuit breaker and its operating device are housed, and these are juxtaposed so that they can be operated on the front side. apparatus. 3. A power receiving / transforming apparatus for supplying power supplied from two lines to a transformer through a transformer for an instrument, and a first transformer on a primary side of a transformer on both sides of the transformer for an instrument. And a second circuit breaker on the power receiving side arranged on both sides of the circuit breaker. The circuit breaker, the power receiving section, the transformer connection section, and the transformer for the instrument are connected at the back of the circuit breaker. A power receiving and transforming device connected by a road connecting portion, wherein an opening / closing door for drawing out an instrument transformer is provided between the first circuit breakers. 4. A power receiving / transforming device for supplying power supplied from two lines to a transformer through a transformer for an instrument, and a first transformer on a primary side of a transformer on both sides of the transformer for an instrument. And a second circuit breaker on the power receiving side disposed on both sides of the circuit breaker. The circuit breaker, the power receiving unit, the transformer connection unit, and the transformer for current metering are connected at the back of the circuit breaker. The first and second circuit breakers are connected by a road connection unit, and the first and second circuit breakers have a structure in which a breaking unit and its operating device are housed in a box-shaped container, and a blocking unit and its operating device are provided on the front surface of the box-shaped container. A power receiving and transforming device provided with an opening / closing door for drawing out from the front. 5. A power receiving / transforming apparatus for supplying power supplied from two lines to a transformer through a transformer for an instrument, and a first transformer on a primary side of a transformer on both sides of the transformer for an instrument. And a second circuit breaker on the power receiving side is arranged on both sides of the circuit breaker. A transformer connection portion is provided on the back of the first circuit breaker, and a power receiving device is provided on the back of the second circuit breaker. Place the department,
A power receiving and transforming apparatus, wherein conductors for connecting the first and second circuit breakers at the back of the instrument transformer are accommodated in one conduit connection part. 6. A power receiving / transforming apparatus for supplying power supplied from two lines to a transformer through a transformer for an instrument, and a first transformer on a primary side of a transformer on both sides of the transformer for an instrument. A circuit breaker and a transformer connecting part connected to the circuit breaker are arranged, and a second circuit breaker on the power receiving side and a power receiving part connected thereto are arranged in parallel on both sides thereof, and a connection for connecting the device behind the circuit breaker. A power receiving and transforming apparatus, wherein a bus bar is arranged orthogonally to each of the devices, and a length dimension and a width dimension of the apparatus are set to a transport limit dimension.