JPH10322811A - Metal sealed switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a metal sealed switchgear capable of individually releasing increased pressure in each chamber even if breakers are stored vertically in multiple layers. SOLUTION: A main circuit apparatus chamber 1A is provided on the left side of the front edge of a box, and a control apparatus chamber 2A on the right side. A common pressure-releasing duct chamber 7A is provided on the back of the control apparatus chamber 2A. A current transformer chamber is provided on the left side on the back of the rear edge partition of the main circuit apparatus chamber 1A, and common pressure-releasing duct chamber 7A and a vertical bus chamber 4 on the right side. Then, a cable chamber 5A is provided on the back of these chambers. A control circuit duct chamber 6A is laterally provided on the top edge of the main circuit apparatus chamber 1A, and the control apparatus chamber 2A and another control circuit duct chamber 6B on the bottom edge. A horizontal bus chamber 3A is provided on the top edge of the vertical bus chamber 4, and another horizontal bus chamber 3B on the bottom edge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a metal-closed switchgear.

[0002]

2. Description of the Related Art FIG. 11 is a right side view showing an example of a conventional metal-closed switchgear, and shows a case of a power supply board in which vacuum circuit breakers are housed vertically in two stages. In FIG. 11, a partition 20a is provided vertically in the center of the box 20, a cable room 5B is formed at the rear of the partition 20a, and a main circuit device room 1B is formed in front of the partition 20a.

[0003] Of these, above the main circuit equipment room 1B,
A busbar chamber 3B is provided at the upper end, and a horizontal busbar 15B is provided horizontally above the busbar chamber 3B via an insulator. A circuit breaker chamber 9B is formed vertically below the busbar portion 3B in two stages, and a draw-out type vacuum circuit breaker 9b is housed in each of the circuit breaker chambers 9B. This vacuum circuit breaker 9
The main circuit disconnecting portion on the upper pole side of b is connected to a vertical bus connected to the horizontal bus 15B.

[0004] A control room 2B is formed further forward of the main circuit equipment room 1B comprising the bus room 3B and the breaker room 9B. The control room 2B is provided above the front side of each breaker room 9B. The control box 2a is accommodated with respect to the position. A front door 20b is attached to the front end of the control room 2B.

On the other hand, in the cable room 5B, current transformers 21 are mounted at positions behind the upper and lower circuit breaker rooms 9B with respect to the back surface of the partition 20a, and the lower terminals of these current transformers 21
The lower circuit side of the vacuum circuit breaker 9b is connected to the main circuit disconnecting portion, and the upper terminal is connected to the upper end of a high-pressure cross-linked polyethylene cable 12 via a compression terminal. These high-pressure crosslinked polyethylene cables 12 are set up from pits (not shown) formed at the rear of the floor on which the box 20 is installed.

Each high-pressure cross-linked polyethylene cable 12 raised from the pit is supported by a cable support 23 fixed to the front side of the rear end of the box 20 via a mounting hardware. It penetrates a zero-phase current transformer 25 fixed to the lower part of the end. A rear door 20c is attached to the rear end of the box 20, and as a result, the box 20 is of a front-rear maintenance type.

In the metal-closed switchgear configured as described above, the horizontal bus 15B is connected at its end to a power receiving panel (not shown) provided adjacent to the box 20, and the horizontal bus 15B is connected to the horizontal bus 15B.
Power is supplied to the load from 15B via each vacuum circuit breaker 9b, current transformer 21 and cable 12.

Further, in the metal-closed switchgear configured as described above, for example, an unexpected inter-phase short-circuit or ground short-circuit may occur at the connection with the main circuit disconnecting portion at the rear of the circuit breaker room 9B. Should an arc occur,
Since the pressure inside the circuit breaker room 9B rises, the partition between the circuit breaker room arranged vertically and the cable room at the rear may be curved or damaged, and the short circuit accident may be increased.

Therefore, a metal-closed switchgear as shown in FIG. 12 is also employed. FIG. 12 shows a case where the vacuum circuit breaker has a single-stage structure, and the main circuit equipment room 1C is located on the left side, which is the front side.
Is formed, and a large-capacity vacuum circuit breaker 9c is incorporated in a drawer type in the middle and upper portion of the main circuit device room 1C.

A horizontal bus 15C is disposed in a bus chamber 3C provided at the rear of the upper part of the vacuum circuit breaker 9c. From the horizontal bus 15C to the upper pole of the vacuum circuit breaker 9c via a main circuit disconnecting portion. It is connected.

A cable room 5C is formed below the busbar room 3C. The upper end of the high-pressure cross-linked polyethylene cable 12 raised in the cable room 5C has a conductor penetrating the current transformer and a main circuit disconnecting portion. It is connected to the lower electrode of the vacuum circuit breaker 9c via the lower electrode.

A control room 2C is provided above the main circuit equipment room 1C.
And a pressure release port is formed in the ceiling at the upper end of the circuit breaker room 9C, and a pressure release door 8K is attached to the pressure release port. A pressure relief port is also formed in the ceiling at the upper end of the busbar chamber 3C, and a pressure relief port is also formed in the extension 26 of the cable room formed in the rear part of the busbar chamber 3C with respect to the ceiling. 8
L and 8M are attached respectively.

In the metal-closed switchgear configured as described above, if the pressure inside the circuit breaker room 9C rises due to a short circuit accident occurring in the circuit breaker room 9C, the pressure release door 8K opens upward. To release internal pressure.

Similarly, the pressure caused by the short circuit accident generated in the bus room 3C is released by the pressure release door 8L, and the pressure inside the cable room 5C is prevented from spreading to the adjacent room by releasing the pressure release door 8M. Is peeling. Incidentally, such an internal pressure releasing structure is also disclosed in Japanese Patent Publication No. 6-67060.

[0015]

[Problems to be solved by the invention]
In the metal-closed switchgear shown in FIG. 11, the pressure caused by the short circuit generated in the bus chambers 3B, 3C and the cable chambers 5B, 5C is caused by the upper ends of the bus chambers 3B, 3C and the cable chambers 5B, 5C. Can be dealt with by providing a pressure relief port and a pressure relief door, but it is difficult to release the pressure by the short circuit generated in the circuit breaker room 9B in FIG. 11 without passing through the busbar room 3B.

Although it is conceivable to increase the width of the box 20 and provide a pressure relief chamber on the side surface of the circuit breaker chamber 9B, if a pressure relief port is formed in the side plate, a space is provided between the box and the adjacent box. Since it must be installed, the installation area of power receiving equipment and the like increases.

It is also conceivable to vertically house a pressure relief duct dedicated to the circuit breaker room inside the bus room 3B. However, this requires the depth of the bus room 3B to be increased. The installation area increases.

On the other hand, in the metal-closed switchgear shown in FIG. 12, the circuit breaker room, the busbar room, and the cable room include:
Although the pressure relief ports are individually formed, if a short circuit accident occurs in the circuit breaker room with the front door opened, it is not preferable for safety.

Furthermore, in the pressure-discharging device for a closed switchboard disclosed in Japanese Patent Publication No. 6-67060, the width of the opening of the box is increased by the pressure-releasing chamber for releasing the pressure for each chamber. Therefore,
SUMMARY OF THE INVENTION It is an object of the present invention to provide a metal-closed switchgear capable of individually releasing the pressure increase generated in each chamber even when the circuit breakers are stored in multiple stages vertically.

[0020]

According to a first aspect of the present invention, there is provided a metal-closed switchgear in which a circuit breaker chamber is formed on one side of a front end of a box body in upper and lower multiple stages, and the front side of the other side of the circuit breaker chamber is formed. A common pressure relief chamber is provided at the rear of the control equipment room, and a current transformer room is provided at one side of the rear of the common pressure relief chamber and the circuit breaker room, and the other side of the current transformer room is provided. A vertical bus room is set up in
A cable room in which a cable connected to a current transformer housed in the current transformer room via a cable head is provided at the rear of the vertical bus room and the current transformer room.

In the metal-closed switchgear according to the second aspect of the present invention, a pressure-releasing duct is inserted into the common pressure-releasing chamber and can be inserted into and removed from the common pressure-releasing chamber. In the metal-closed switchgear according to the third aspect of the present invention, the current transformer room and the vertical bus room are provided with partitions corresponding to the partitions that partition the circuit breaker room, and the vertical bus room is provided with vertical partitions. An insulating spacer through which the bus bar passes is provided.

In a metal-closed switchgear according to a fourth aspect of the present invention, a control duct chamber is provided above and below the circuit breaker room and the control equipment room, and a horizontal bus room is provided above and below the vertical bus room. And a partition for horizontally dividing the horizontal bus chamber is provided on one side of the horizontal bus chamber, and an insulating spacer through which the horizontal bus passes is provided on the partition. The closed switchgear is characterized in that a heat radiation space is formed between the pressure release chamber and the pressure release duct.

By such means, in the present invention, the pressure caused by the arc generated in each circuit breaker room and the vertical bus room is released to the upper part of the box through the common pressure relief chamber, thereby increasing the spread of the accident. suppress.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a metal-closed switchgear according to the present invention will be described below with reference to the drawings. FIG.
FIG. 2 is a perspective view showing the first embodiment of the metal-closed switchgear of the present invention, viewed from the upper right front side, and FIG.
2 is an enlarged cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a partially enlarged perspective view of FIG. 2, and FIG.

In FIGS. 1, 2, 3 and 4, the main body is vertically formed with a main circuit equipment room 1A for housing the vacuum circuit breakers 9a in three stages on the front left side. Room 1
The right side of A is divided into front and rear, the front is the control room 2A, and the rear is the common pressure release duct room 7A.

The main circuit equipment room 1A and the control room 2A
A control circuit duct chamber 6A is formed laterally above the common pressure release duct chamber 7A as shown in FIG. 1, and a control circuit duct chamber 6B is symmetrically formed below the common discharge duct chamber 7A. Both ends of these control circuit duct chambers 6A and 6B are openings.

Of these, a common control room door is provided in front of the control room 2A, and protection relays 10 are attached to the control room door in three stages at positions corresponding to the respective breaker rooms. ing. An individual front door is attached to the front of each circuit breaker room 9A that houses the vacuum circuit breaker 9a.

The vacuum valves housed in the rear part of the vacuum circuit breaker 9a are horizontally arranged in three stages, as shown in FIG. Therefore, the main circuit disconnecting portions provided at the rear end of the circuit breaker chamber 9A are also arranged in two rows on the left and right as shown in FIG.

The partition provided between each circuit breaker room 9A and the common pressure release duct chamber 7A does not disclose a double-opening pressure release plate 8A that opens toward the common pressure release duct room 7A as shown in FIG. It is attached to the pressure relief port.

At the right side of the main circuit equipment room 1A and at the rear of the common pressure release duct room 7A, vertical bus chambers 4 are provided in three stages as shown in FIG. Instrument rooms 22 are provided in three stages. A horizontal bus bar 3A is formed at the upper and lower ends of the vertical bus bar 4 as shown in FIG. 1, and both ends are openings.

Of these, the vertical busbar chamber 4 is vertically partitioned into three stages by an insulating spacer 16 of an epoxy resin cast molded product shown in an enlarged detailed perspective view of FIG. And is fixed via a flange portion of the insulating spacer 16.

Each of these insulating spacers 16 has a vertical bus 11 penetrating therethrough. The vertical bus 11 has a left end connected to the right main circuit disconnecting portion 17 at the rear end of each breaker room 9A. The right end of the connection conductor 11a is connected. The current transformer room 22 houses through-type current transformers 18, and the front ends of the conductors penetrating these current transformers 18 are connected to the rear end of the main circuit disconnecting portion 17 on the left side.

The partition between the vertical bus chambers 4 and the common pressure-release duct chamber 7A is also provided with a double-sided pressure-release plate 8B shown in FIG. 2 at the opening, and is attached to the ceiling plate of the common pressure-release duct chamber 7A. As shown in FIG. 1, the pressure-release plate 8C
The pressure relief plate 8D is also provided in an opening formed in the ceiling of the uppermost circuit breaker room 9A.

The vertical bus room 4, the current transformer room 22, and the cable room 5
The front end of the cable head 19 is attached to the partition that separates A from the position behind the current transformer room 22, and the front end of the center conductor of these cable heads 19 is the conductor of the conductor passing through the current transformer 18. The rear ends are each connected.

The lower ends of these cable heads 19 are connected to the upper ends of high-pressure crosslinked polyethylene cables 12 raised from the floor of the cable chamber 5A as shown in FIGS. 12 is
An intermediate portion is supported by a cable support 23.

An opening is formed over the entire surface of the ceiling of the cable chamber 5A, and as shown in FIG.
E is attached via a plurality of hinges fixed to the horizontal bus bar 3A side. A rear door is attached to the rear of the cable room 5A to form a front-rear maintenance box.

In the metal-closed switchgear configured as described above, the control lines of the low-voltage circuit connecting the adjacent boxes are connected via the control circuit duct chambers 6A and 6B above and below the front end. The connection work is easier than the wiring connection work that connects via a pit under the floor.

A horizontal bus connecting the adjacent power supply board and the power receiving board is provided through the upper and lower horizontal bus chambers 3A, and the vertical bus 11 is connected to the horizontal bus accommodated in the horizontal bus chamber 3A. .

The pressure relief caused by the short circuit occurring in the middle and lower circuit breaker rooms 9A corresponds to the opening of the pressure relief panel 8A, and the pressure release in the uppermost circuit breaker room 9A is controlled by the circuit breaker room 9A.
The pressure relief plate 8D provided on the ceiling plate of A corresponds to this.

Further, the pressure relief of the accident occurring in the vertical bus room 4 is handled by the pressure relief plate 8B in front of the vertical bus room 4, and in this case, the ceiling portion is operated similarly to the operation of the pressure relief plate 8A. The pressure relief plate 8C also operates. On the other hand, an accident occurring in the cable room 5A is handled by the operation of the large pressure release plate 8E provided on the ceiling of the cable room 5A.

Therefore, in the metal-closed switchgear configured as described above, the pressure can be released for each unit circuit, so that it is possible to prevent the spread to the adjacent circuit when an accident occurs.

Next, FIG. 5 is a partial cross-sectional view showing a second embodiment of the metal-closed switchgear of the present invention, and particularly corresponds to claim 2 and is shown in FIG. 2 according to the first embodiment. The figure corresponding to the common pressure relief duct 7A of FIG.
It is omitted because it is the same as.

In FIG. 5, an opening formed in the ceiling portion of the common pressure release duct 7A is provided with a rectangular tube pressure release duct 13A whose outer circumference is slightly smaller than the inner circumference of the common pressure release duct 7A. Insert from the part and fix from the outside of the ceiling plate. Pressure-releasing plates 8F and 8G are attached to the pressure-releasing duct 13A with respect to the partition between each vertical bus chamber 4 and the intermediate part and the lower circuit breaker chamber.

In the metal-closed switchgear into which the pressure release duct 13A is inserted as described above, the pressure release duct is formed of a double steel plate, so that not only deformation at the time of pressure release but also deformation can be prevented. First, in the case of damage, the recovery work of the accident can be performed in a short time by inserting a substitute from above.

In the above-mentioned embodiment, molybdenum heat-resistant steel, chromium heat-resistant steel, or the like may be used as a material forming the common pressure release duct 7A and the pressure release duct 13A.
Alternatively, the surface of the mild steel sheet may be subjected to heat treatment such as a silicate compound.

FIG. 6 is a partial cross-sectional view showing a third embodiment of the metal-closed switchgear of the present invention, and corresponds to FIG. 5 shown in the second embodiment, and particularly corresponds to claim 5. FIG.

FIG. 6 differs from FIG. 5 in that a heat radiation space 14 is formed in the common pressure release duct 7A and a pressure release duct 13B is inserted. In this case, the influence of heat at the time of pressure release on each adjacent room can be further suppressed, so that the spread of the accident can be further suppressed.

FIG. 7 is a partial perspective view showing a fourth embodiment of the metal-closed switchgear of the present invention, and corresponds to an enlarged detailed view of the horizontal bus bar chamber 3 shown in FIG. FIG. 8 is a diagram corresponding to the CC cross-sectional perspective view of FIG.

In FIGS. 7 and 8, insulating spacers 16 are provided through upper and lower partitions of the upper and lower vertical bus chambers 4, and the uppermost insulating spacer 16 and the lowermost insulating spacer 16 are provided.
The horizontal bus bar 15A is connected to the vertical bus bar 11 protruding from 16. The left end of these horizontal buses 15A is the horizontal bus room 3
Insulating spacer fixed to the partition provided on the left side of A
It passes through 16.

FIG. 9 is a partial cross-sectional view showing a fifth embodiment of the metal-closed switchgear of the present invention.
FIG. 7 is a diagram corresponding to FIGS. 5 and 6. FIG. 10 corresponds to FIG.
It is DD sectional drawing of.

9 and 10, the common pressure release duct chamber 7B is made of a thick plate, and is provided at the rear end of the circuit breaker room 1A, which is the same as the circuit breaker room 1A shown in FIGS. The power supply side main circuit disconnecting portion 17 is vertically provided on the right side, and the load side main circuit disconnecting portion 17 is vertically provided on the left side.

[0052]

As described above, according to the present invention, a circuit breaker chamber is formed on one side of the front end of the box body in upper and lower stages, and a control device room is provided in front of the other side of the circuit breaker room. A common pressure relief chamber is provided at the rear, a current transformer chamber is provided on one side of the rear of the common pressure relief chamber and the circuit breaker chamber, and a vertical bus chamber is provided on the other side of the current transformer chamber. And by providing a cable room in which a cable connected via a cable head to the current transformer housed in the current transformer room is provided at the rear of the current transformer room, each breaker room and the vertical bus room are provided. Pressure generated by the generated arc was released to the upper part of the box via the common pressure relief chamber to suppress the spread of the accident, so even when the circuit breaker was stored in multiple stages vertically, it was generated in each room. It is possible to obtain a metal-closed switchgear in which the pressure rise can be released individually.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a metal-closed switchgear of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG.

FIG. 3 is a partially enlarged detailed perspective view of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a partial cross-sectional view showing a second embodiment of the metal-closed switchgear of the present invention.

FIG. 6 is a partial cross-sectional view showing a third embodiment of the metal-closed switchgear of the present invention.

FIG. 7 is a partial perspective view showing a fourth embodiment of the metal-closed switchgear of the present invention.

FIG. 8 is a partial perspective view showing a fourth embodiment of the metal-closed switchgear of the present invention, which is different from FIG. 7;

FIG. 9 is a partial cross-sectional view showing a fifth embodiment of the metal-closed switchgear of the present invention.

FIG. 10 is a sectional view taken along line DD of FIG. 9;

FIG. 11 is a right side view showing an example of a conventional metal-closed switchgear.

FIG. 12 is a right side view showing an example of a conventional metal-closed switchgear different from FIG. 11;

[Explanation of symbols]

1A, 1B ... main circuit equipment room, 2A, 2B ... control equipment room,
3A, 3B ... horizontal bus room, 4 ... vertical bus room, 5A, 5B ...
Cable room, 6A, 6B ... control circuit duct room, 7A, 7
B: Common pressure release duct chamber, 8A, 8B, 8C, 8D, 8
E, 8F, 8G, 8H ... pressure relief plate, 9A ... breaker room, 9a
... Vacuum breaker, 10 ... Protective relay, 11 ... Vertical bus, 12 ... High-pressure cross-linked polyethylene cable, 13A, 13B ... Pressure release duct,
14 ... heat radiation space, 15A, 15B ... horizontal bus, 16 ... insulating spacer, 17 ... main circuit disconnecting part, 18, 21 ... current transformer, 19 ... cable head, 20 ... box body, 22 ... current transformer room, 23 … Cable support, 24… partition.

Claims (5)

[Claims] 1. A circuit breaker chamber formed in one side of a front end of a box body in a vertically multi-stage manner, a control device room provided in front of the other side of the circuit breaker room, and a rear portion of the control device room. A common pressure relief chamber, a current transformer chamber provided on one side behind the common pressure relief chamber and the circuit breaker chamber, a vertical bus chamber provided on the other side of the current transformer chamber, A metal-closed switch including a bus room and a cable room provided at a rear portion of the current transformer room and provided with a cable connected to a current transformer housed in the current transformer room via a cable head. gear. 2. The pressure relief plate according to claim 1, wherein a pressure relief duct is inserted into and removed from the common pressure relief chamber, and a pressure relief plate is provided on a ceiling of the pressure relief chamber and the cable chamber. Metal closed switchgear. 3. A partition corresponding to a partition that partitions the circuit breaker chamber is provided in the current transformer room and the vertical bus room, and an insulating spacer through which the vertical bus passes is provided in the partition of the vertical bus room. 3. The method according to claim 1, wherein
2. A metal-closed switchgear according to claim 1. 4. A control duct room is provided horizontally above and below the circuit breaker room and the control device room, and a horizontal bus room is horizontally provided above and below the vertical bus room, and the horizontal bus bar is provided on one side of the horizontal bus room. The metal-closed switchgear according to any one of claims 1 to 3, wherein a partition is provided for partitioning the chamber left and right, and an insulating spacer through which the horizontal bus bar passes is provided in the partition. 5. The metal-closed switchgear according to claim 2, wherein a heat radiation space is formed between the pressure release chamber and the pressure release duct.