KR100876586B1 - Metal-clad compartment and air-insulated compact panel - Google Patents

Abstract

The metal-clad compartment and air-insulated compact panel are provided to reduce the size by improving the layout structure of instrument and to facilitate maintenance, repair and installation by forming the compartment structure. The metal-clad compartment and air-insulated compact panel comprises the partition segmented with the five metal plates. The first partition comprises the end connector(12), the local data center and the control power supply unit. The second partition comprises the voltage indicator, the voltage table timing control, the air break switch, the instrument transformer(24), the lightning arrester and, power fuse link(26) and the secondary baffle(2). The third partition comprises the potential transformer, the vacuum interrupter, the extra-high voltage current transformer, protection control device, and the surge absorber. The fourth partition(4) comprises the voltage table timing control, the temperature display controller, and the mold transformer and the molded-case circuit breaker. The fifth partition includes with the molded-case circuit breaker, the air circuit breaker, the common electricity air circuit breaker, the air circuit breaker, automatically power factor controller, and the potential transformer.

Description

Air insulation high and low pressure compartment metal sheath insulation shrink type closed switchgear {METAL-CLAD COMPARTMENT AND AIR-INSULATED COMPACT PANEL}

The present invention relates to a closed switchgear for converting a high current into a required low voltage and supplying it to a user, and in particular, an air insulation high and low voltage compartment metal coating insulation having improved safety in workability while being made of a compact and safe structure without its bulkiness. It relates to a reduced type closed switchgear.

In general, special high voltage power is supplied by KEPCO from customers in industrial plants, schools, buildings, etc., and the special high voltage power is converted from the transformer to the working voltage. For this purpose, a switch, a meter, a relay (relay), and so on are constantly managed by a switchboard.

These switchboards are equipped with various main circuit devices such as load breakers, fuse links, lightning arresters, transformers for transformers, breakers, relays, and instruments. It consists of four compartments, each of which is distinguished by various main circuit devices installed inside the switchboard.

By the way, the existing general switchboard is exposed to the conductor portion to install the device as described above is bulky to secure the insulation distance and occupy a large area in the installation.

Therefore, there is a problem that not only can not be installed in a narrow area, but also takes a lot of money to transport the equipment, the installation cost is also increased.

For example, Figure 1 is a front view showing a conventional switchboard, as shown in the drawing, the conventional switchboard is composed of eight partitions (a, b, d, d, d, d, b, d, h). The first bulkhead (A) is provided with a load breaker (LOAD BREAK SWITCH: LBS), a power fuse (PF), and an arrester (LA) for opening all three phases supplying current to prevent an imaging accident. The bulkhead (b) includes transformer for transformer and current transformer (MOF), the third bulkhead (c) for low-voltage transformer (POTENTIAL TRANSFORMER: PT), and the fourth bulkhead (d) for surge absorber for grounding for abnormal voltage protection. SA), the 5th bulkhead (MA) has a peripheral transformer (MAIN TRANSFORMER (MTR)), the 6th bulkhead (bar) has a low-voltage switchgear converted to low pressure from the peripheral pressure transformer, the 7th bulkhead (g) 2 low-pressure switchboard, 8 Three low-pressure switchboards are provided in the partition wall.

As described above, the conventional switchgear requires a plurality of partition walls, and the reason why the controllers for controlling the flow of current are individually installed on each of these partition walls is that a high voltage current bus bar is connected to each controller. Since the connection part is exposed to the atmosphere as it is, since a high-pressure current flows through the air through the exposed part, a predetermined insulation distance is required to connect another controller to one controller.

In general, such an insulation distance should be more than 210mm in an indoor type switchboard of 22.9 KV or less. Therefore, in a conventional switchboard, in order to secure a safe insulation distance when connecting other equipment to the busbar, other equipment from the connection conductor is used. The distance up to about 300mm should be connected.

In addition, in the conventional switchboard, even when the support insulator is installed in the panel partitioning the partition wall, the insulation distance between the busbar and the panel connected to the front end should be maintained.

As described above, in the conventional switchboard, in order to connect another controller to one electric controller or to install the controller in the partition wall, the insulation distance as described above is inevitably secured, so the size of the switchboard is inevitably large. none.

In addition, the conventional switchboard has a structure in which the entire door control unit is exposed in the above-described structure, and thus, it is adversely affected by dust gas, etc., and there is a risk of inadvertent operation due to inadvertent operation. It has a structure that is exposed, there is a concern that the accident spread to the peripheral equipment when an arc accident occurs inside the switchboard, there is a problem that the conductor connection is exposed, which is very dangerous during maintenance.

In addition, since a general conventional switchboard has a structure in which a conductor part is exposed, it is very difficult to secure safety of maintenance inspection.

Therefore, the existing switchgear according to the prior art has the entire busbar connection path between the terminal part conductor part (ASS or LBS, MOF, VCB, PT, CT, inlet transformer, etc.) installed inside the terminal part and the panel being exposed. In case of a fire caused by an arc accident inside the switchboard, accident spread to peripheral devices is expanded, and there are many problems for safety.In order to secure the insulation distance between main circuit equipment, earth, phase and main circuit equipment, Since much space is required, the size (width W, height H, depth D) of the switchboard is inevitably large, which inevitably degrades the environment, economy, safety, and workability.

Therefore, the present invention solves the problems according to the conventional general switchboard as described above, by forming a partition structure between the nibble panel and the main circuit equipment of each panel as a partition wall to improve the arrangement of the device to improve the overall size of the closed switchboard To improve safety by minimizing the spread of accidents to peripheral devices, to provide convenience for maintenance and inspection, and to provide easy-to-carry, install, high- and low-pressure compartment metal-coated insulation-shrink-type closed switchboards. The purpose is to provide.

The switchgear of the present invention for achieving the above object is composed of five partitions consisting of each compartment, the first partition is a terminator connected to a high voltage current supply cable of 22.9KV supplied from KEPCO, the site A data center and a control power supply room; The second bulkhead includes a voltage indicator indicating the voltage of electricity introduced from the first bulkhead, a load switch, a power fuse, an instrument transformer, an arrester, a voltage display controller for sensing and controlling the voltage, and a maximum demand power controller for energy saving. It is made with; The third partition wall is provided with an instrument transformer, a vacuum circuit breaker, a current transformer for an extra-high voltage instrument, a digital multifunction power protection monitoring and control device, and a surge absorber; The fourth partition includes a voltage display controller, a temperature display controller, a low noise and high efficiency mold transformer, and a circuit breaker, while the fifth partition includes a circuit breaker, an emergency power circuit breaker, a commercial power circuit breaker, a air circuit breaker, APFC, LPT , LCT, etc.

In addition, a transparent inspection window is installed in the doors provided in the respective compartments so that the interior can be inspected without opening the door from the outside.

The switchgear according to the present invention is configured with a partition structure by applying a wall through bushing and a high-pressure bushing fuse holder to reduce the size of the panel, has the highest protection class among the air-insulated high and low voltage closed switchgear, and accident propagation to peripheral devices. Was minimized.

In addition, by applying a high and low pressure multi-purpose movable busbar clamp, the processing process of the busbar is reduced, and the installation is quick and easy, thereby greatly improving economic efficiency and workability.

In addition, by applying the insulation cover of high and low voltage conductor exposed portion, the bus bar extra high voltage separation distance between phases is reduced from 300mm to 250mm and there is no conductive part exposed inside the switchboard.

      In addition, compartments of compartments such as busbars, breakers and low pressure chambers are shielded by metal bulkheads to provide a safe structure that does not affect other compartments in case of an accident.

Auxiliary doors equipped with surveillance windows are installed to protect various protective relays and indicators installed on the doors to protect them from dust and gas and to prevent accidents that may occur due to misoperation.

MOF and power mold transformer are installed safely by rail structure, which shortens the installation time and improves safety and efficiency of work.

When arc occurs due to an internal accident in the panel, the door of the pressure exhaust port is automatically opened by the internal pressure, and there is a great effect of exhausting gas in a short time.

The grounding circuit is installed by busbars without using grounding cables (GVs), thus establishing a perfect grounding system.

The switchgear of the present invention consists of only five partition walls using various control device connection tools as described above, the switchgear according to the present invention has a standard width (W) 40.3% of the enclosure compared to the detailed specification compared to the existing switchboard, It can reduce height (H) 7.8%, depth (D) 11.6% and installation area 47.2%.

As described above, the air-insulated high-low voltage compartment metal-coated insulation-reduced closed switchgear is reduced in size, has a high degree of protection of IP4X, is easy to operate and install, safe to maintain and inspect, and economical by standardizing design. And a good effect to improve workability can be obtained.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

Figure 2 is a front view showing the arrangement of the internal device in the switchboard according to the invention, Figure 3 is a rear view showing the arrangement of the internal device of the switchboard according to the invention, each compartment shows the rear in the front position. 4 is a power system diagram in the nirvana state of a switchboard according to the present invention.

As shown in these figures, the switchboard according to the present invention comprises five partitions 1, 2, 3, 4, and 5 partitioned by a metal plate.

The first partition 1 includes a terminator 12 and a control power supply 13 to which a high voltage current supply cable 11 of 22.9 KV supplied from KEPCO is connected, and the terminator 12 is installed. It consists of the connection room 14, the field data center 15, and the control power supply room 16.

The field data center 15 collects data necessary for operating an electrical room and enables long-distance data communication to a member of the electrical room unattended.

The control power supply chamber 16 replaces the rectification base of the existing product, and simultaneously outputs the control power AC220V and DC110V, simplifying maintenance and inspection.

The second bulkhead 2 includes a voltage indicator 21 for displaying the voltage of electricity introduced from the first bulkhead 1, a load switch 22, a voltage display controller 23 for sensing and controlling voltage, and an instrument. A transformer 24, an arrester 25, a power fuse link 26 and a high-pressure bushing fuse holder 27 is provided.

As shown in FIG. 6, the second partition 2 is divided into four rooms 2-A, 2-B, 2-C, and 2-D. Busbars 28 connected to the bulkhead 1, the air load breaker 22, the high-pressure bushing fuse holder 27 and the arrester 25 is installed, the instrument transformer 24 is installed in the 2-B room. In the 2-C room, a secondary bus booth bar is installed, while the 2-D room is composed of a low pressure chamber.

The high-voltage bushing type fuse holder 27 has a voltage sensing function sensor (VD) built therein to operate the circuit breaker when the fuse link is blown to protect the upper bus line.

On the other hand, the instrument transformer 24 can be easily coupled through the rail 28 installed on the bottom surface of the 2-B room, C-shaped guide installed on the bottom surface of the instrument transformer 24 By providing (29), not only the installation and dismantling of the instrument transformer 24 is easy, but also the effect of improving the workability and stability by making the position fixed firmly can be obtained.

The third partition 3 includes an instrument transformer 31, a vacuum circuit breaker 32, a current transformer 33 for an extra-high voltage instrument, a digital multi-function power protection monitoring and control device 34, and a surge absorber 35. Is done.

And the third partition 3 is divided into four rooms (3-A, 3-B, 3-C, 3-D) as shown in Figure 7, the second partition (3-A) 2) and the bus bar 36 and instrument transformer 31 connected to the built-in, the current transformer 33 and the primary and secondary connection terminal surge absorber 35 is disposed in the 3-B room, 3 The breaker 32 is disposed in the -C room, and the 3-D room is composed of a low pressure chamber.

The fourth partition 4 includes a voltage display controller 41, a temperature display controller 42, a mold transformer 43, a wiring breaker 44, and a power fuse 45.

As shown in FIG. 8, the fourth partition 4 is divided into four rooms 4-A, 4-B, 4-C, and 4-D. The busbar 46 connected to the partition 3 is installed, the power fuse 45 is disposed in the 4-B room, and the low-noise high-efficiency mold transformer 43 is disposed in the 4-C room. Room D consists of a low pressure chamber.

The mold transformer 43 is supported by the rail 47 to facilitate installation and dismantling, thereby improving workability and stability.

Finally, the fifth bulkhead 5 is an emergency power breaker 51, a commercial power breaker 52, a crane breaker 53, an automatic power factor control device (APFC) 54, an instrument transformer (LPT) 55 ), An LCT 56, a circuit breaker 57, and the like.

As shown in Fig. 9, the fifth partition 5 is divided into two upper and lower chambers 5-A, 5-B with a metal partition at the center.

The main power air circuit breaker 51 is installed in the 5-A room, and the commercial power air circuit breaker 52, the emergency power air circuit breaker 53, the wiring breaker 57, and the auxiliary relay are installed in the 5-B room. .

As shown in FIGS. 2, 3, and 4, the partition walls 1, 2, 3, 4, and 5 partitioned by the metal plate 101 pass through the metal plate 101. It is installed by the mold bushing 102.

As shown in FIG. 10, the wall through-type bushing 102 has a conductor 103 inserted therein, and an annulus 104 made of an insulator in which current is not energized around the conductor 103. It is disposed, the plurality of insulating protrusions 105 protruding in the radial direction on the surface of the pipe 104 is formed radially at regular intervals, while the vertical contact type made of a conductor at the tip of the pipe 104 The connecting plate 106 or the horizontal projecting connecting plate 107 is provided.

The wall through-type bushing 102 is a device installed through the metal plate 101 to connect the busbars between the compartments in an insulated state. As described above, the electrical conductors 103 and the shield are built in use. It is excellent in electrical and mechanical durability because there is no partial discharge and it is easy to install by selecting and using various models.

In addition, both ends are provided with connecting plates 106 and 107 having four or two screw holes 108 which can be connected to each other so that two or more bolts are fastened mechanically and the busbar connection resistance is reduced.

In addition, when the panel is installed, the insulation distance from the center of the bushing of the bushing to the tip connecting plate is 250mm, and even if there is a protruding metal jaw of 40mm or less, the required 210mm insulation distance is maintained, so insulation reinforcement by other insulation material is unnecessary. By using the bushing as a compartment inside the panel, it is possible to reduce the size of the panel by reducing the insulation distance between devices and the ground.The panel installation is simple, and the busbar processing process is improved because the busbar is shortened by the length of the bushing. Economics and productivity can be increased.

On the other hand, the power fuse link 26 is made of a high-pressure bushing fuse holder base 201 as shown in Figure 11, the high-pressure bushing fuse holder base 201 is inserted into the conductor 202 therein And a pipe line 203 made of an insulator in which current is not energized around the conductor 202, and a hook for hanging on the metal partition 101 at a center along a length direction of the pipe line 203. The part 204 is provided, and the connecting plate 205 which consists of conductors is provided in the both ends of the said love pipe 203, and the fuse for opening / closing switch 206 is provided in the both ends or one end provided with the said connecting plate 205. Fuse clip 207 for installing is made.

The wall through-type bushing 102 and the high-pressure bushing fuse holder base 201 used in the switchboard of the present invention are mounted on the metal partition 101 as shown in FIG. 12 and the bushing 102 and the fuse holder base. Since a magnetic circuit is formed by the current flowing through the 201, an eddy current is generated, and heat generated therefrom may cause fire and insulation breakdown. Therefore, the rectangular hole 103 is machined in the center of the R phase-S phase-T phase. By blocking the eddy current and covering the stainless cover 104 which does not generate magnetic flux in the rectangular hole 103, the front and rear main circuit devices are invisible, thereby shortening the insulation distance and reducing the size of the switchboard.

In addition, the switchboard according to the present invention by using a mobile busbar clamp 301 as shown in Figure 13 by fastening the busbar is energized, it can significantly improve the overall manufacturing process to improve the productivity bar, The movable busbar clamp 301 is provided with a frame 304 on which vertical sidewall portions 303 are erected vertically on both sides of the horizontal bottom portion 302, and an installation formed on both vertical sidewall portions 303 of the frame 304. Two or more support pins 306 fitted into the grooves 305; A pressure regulating plate 309 for adjusting adhesion to two busbars 307 and 308 to be inserted and connected between the horizontal bottom portion 302 and the support pin 306 of the frame 304; The compression bolt 310 is coupled to the pressure adjusting plate 309 to tightly support the pressure adjusting plate 309 with respect to the two busbars 307 and 308 to bind both busbars 307 and 308.

Such a mobile busbar clamp of the present invention is a multi-purpose that can be used together at high and low pressures, and when designing a hole for fastening busbars, the positioning of the holes is very important and must be adapted to various devices, so the design thereof must be made very accurately. There was a hassle, but by using this clamp can be solved by fastening without engaging holes in the busbar.

In addition, by not drilling holes in the busbar, the cross-section of the busbar is maintained in a circular shape so that the connection resistance does not increase, and heat generation can be reduced.In case of connecting the busbar with peripheral devices, simply insert it at the tip and tighten only four compression bolts. It can provide convenience for fastening.

In addition, in the switchboard according to the present invention, as shown in FIG. 14, the bus bar 401 is connected to each other or the bus bar 401 and the wall-connected bushing 102 described above are connected to the connection part. By installing the insulating cover 402 made of an insulating material, it is possible to reduce the installation interval of the electrical equipment.

As shown in FIG. 14, the insulation cover 402 is insulated using a high and low pressure heat shrinkable type and an air sink tube, but the terminal part is exposed to the air in a short circuit and ground fault. It is the cause. In order to solve this problem, the insulation cover is developed and used in various models according to the shape of the exposed conductive parts such as various main circuit devices, busbar terminal parts and branch connection parts, and the upper cover and the lower cover are assembled to each other. It's easy.

In addition, the application of the insulation cover used in the switchgear of the present invention can reduce the busbar interphase distance of the high-voltage closed switchgear from 300mm to 250mm (certified by the KERI 25.8kV high-voltage switchgear test results phase distance safety) Its size can be reduced, and the conductor part of the busbar inside the closed switchgear is not exposed, so the bus line is protected by an insulation cover even when invading various insects and animals (rats, cats, etc.) It has a great effect on prevention.

As described above, the switchboard according to the present invention uses a wall-through bushing 102, a high-pressure bushing fuse holder base 201, an insulation cover 402, and a movable busbar clamp 301 to adjust a high-voltage current to a low pressure. Since the distribution of the distribution panel to be distributed can be made compact, the existing general panel-type switchgear can be made up of five partitions, which consists of eight partition walls. As shown in FIG. 15, the distribution panel according to the present invention is conventional. 47.2% of the installation area (B) is sufficient compared to the installation area (A).

In addition, since the height can be reduced by about 7.8%, the switchboard according to the present invention can be installed even in a small area.

1 is a front view of a conventional general nirvana type switchgear.

Figure 2 is a front view showing the arrangement of the internal device in the switchboard according to the invention,

Figure 3 is a rear view showing the internal device arrangement of the switchboard according to the invention, each compartment showing the rear view in the front position,

4 is a power system diagram in a nirvana state of a switchboard according to the present invention;

5 is a left side view of the first partition wall of the switchboard according to the present invention;

6 is a left side view of the second partition of the switchboard according to the present invention;

7 is a left side view of the third partition of the switchboard according to the present invention;

8 is a left side view of the fourth partition of the switchboard according to the present invention;

9 is a left side view of the fifth partition of the switchboard according to the present invention;

10 is an explanatory view of a wall through bushing used for coupling a switchboard according to the present invention;

11 is an explanatory diagram of a high-pressure bushing fuse holder base used for coupling the switchboard according to the present invention;

12 is a cross-sectional view of the eddy current blocking device due to the closed curve when the wall through bushing according to the present invention is installed on the metal panel,

13 is an explanatory view of a movable busbar clamp used for coupling a switchboard according to the present invention;

14 is an explanatory view of an insulating cover used for coupling the switchboard according to the present invention;

15 is a plan view showing the area of the closed switchboard according to the present invention and the conventional general switchboard.

Claims (9)

It consists of five partitions partitioned by a metal plate, and the first partition 1 has a terminator 12 to which a high voltage current supply cable of 22.9 KV supplied from KEPCO is connected, a field data center 15 and a control power supply. Consisting of a supply chamber 16; The second bulkhead 2 includes a voltage indicator 21 for displaying the voltage of electricity introduced from the first partition 1, a load switch 22, a voltage display controller 23 for sensing and controlling voltage, and a meter. A transformer (24), an arrester (25), and a power fuse link (26); The third bulkhead 3 includes an instrument transformer 31, a vacuum circuit breaker 32, a current transformer 33 for an extra-high voltage instrument, a digital multi-function power protection monitoring and control device 34, and a surge absorber 35. ; The fourth partition 4 includes a voltage display controller 41, a temperature display controller 42, a mold transformer 43, and a circuit breaker 44, while the fifth partition 5 has a circuit breaker 57. ), And an air insulation high and low pressure compartment metal including an emergency power circuit breaker 51, a commercial power air circuit breaker 52, a air circuit breaker 53, an automatic power factor control device 54, and a transformer for instrument 55. In the sheathed insulation reduction type closed switchboard, The instrument transformer 24 is made to couple through a rail provided on the bottom surface, The mold transformer 43 is installed to move through the rail, The first bulkhead 1 to the fifth partition 5 are connected to supply electricity to each other through a wall through bushing 102 installed through the metal partition wall, A rectangular hole is cut in the center of the R-S-T-T phase in the metal partition wall in which the wall-through bushing 102 is installed, and the eddy current is cut off, and the stainless hole is provided with a stainless cover which does not generate magnetic flux. The wall through-type bushing 102 has a conductor 103 inserted therein, and a conduit 104 made of an insulator in which current is not conducted around the conductor 103 is disposed, and the conduit 104 is disposed. A plurality of insulating protrusions 105 protruding in the radial direction on the surface of the radially formed radially at regular intervals, while the vertical contact type contact plate 106 or horizontal protrusions formed of a conductor at the tip of the pipe 104 The connecting plate 107 is installed, The power fuse link 26 is formed of a high-voltage bushing fuse holder base 201, the high-voltage bushing fuse holder base 201 is a conductor 202 is inserted therein, the peripheral portion of the conductor 202 A pipe 203 made of an insulator in which current is not energized is disposed, and a locking portion 204 is provided at the center along the length direction of the pipe 203 so as to be engaged with the metal partition 101. Connection plates 205 made of a conductor are provided at both ends of the pipe 203, and fuse clips 207 for installing the open / close switch fuses 206 at both ends or one end of the connection plate 205 are provided. ) Is installed, The closed switchgear fastens the busbars through which electricity is energized using the movable busbar clamps 301, and the movable busbar clamps 301 are vertical sidewall portions 303 that are vertically oriented on both sides of the horizontal bottom portion 302. Two or more support pins 306 inserted into and installed in the frame 304 in which the grooves are formed and the installation grooves 305 formed in both vertical side wall portions 303 of the frame 304; A pressure regulating plate 309 for adjusting adhesion to two busbars 307 and 308 to be inserted and connected between the horizontal bottom portion 302 and the support pin 306 of the frame 304; Is coupled to the pressure adjusting plate 309 is a structure consisting of a compression bolt 310 for holding the pressure adjusting plate 309 in close contact with the two busbars (307,308) to bind both busbars (307,308), The closed switchboard is characterized in that the bus bar 401 is connected to each other or the bus bar 401 and the wall portion of the bushing bushing 102 is connected to the insulating cover 402 made of an insulating material is installed is covered with Air insulation high and low pressure compartment metal clad insulation delete delete delete delete delete delete delete delete

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