KR200434542Y1 - A distributing board which has bushing of wall-piercing - Google Patents

Abstract

The present invention is designed to have a structure in which the width of the existing equipment comparison panel is about 48% or more and the depth is reduced to about 20% so that it can be applied to a narrow area when it is not possible to cut power at the time of replacing the existing water distribution pipe equipment. By connecting the KEPCO inlet panel part, LBS & MOF panel part, PT & VCB panel part, MTR & ACB power panel part by wall through bushing, the overall size of switchgear can be reduced, and safety and workability It is an object of the present invention to provide an insulated contracted switchgear consisting of a wall through bushing which can improve the efficiency of the insulation.

Bushings for connecting BMC insulation plates, compartments and busbars

Description

Insulation-shrinkable switchgear consisting of wall through bushing {A DISTRIBUTING BOARD WHICH HAS BUSHING OF WALL-PIERCING}

1 is a cross-sectional view of a switchgear having an inlet transformer according to the prior art,

2 is a cross-sectional view of a switchgear having a mold transformer according to the prior art,

3 is a cross-sectional view of a switchgear of a structure in which an automatic fault switchgear and a power fuse are integrated according to the related art;

Figure 4 is a plan view showing a wall through bushing according to the present invention,

FIG. 5 is a diagram illustrating an I-shaped high-voltage current-limit type fuse bushing holder installed in a wall through bushing when connecting a KEPCO inlet panel unit and an LBS primary terminal according to the present invention, or when connecting a MOF and a secondary bus-bar-basil. Ye

Figure 6 is an embodiment showing a U-shaped high-pressure current-limit fuse bushing holder is installed in the wall through the bushing when connected to the high-pressure current-limit fuse of the LBS, or when connected to the LA in the vertical direction,

Figure 7 is an embodiment showing a TT-shaped high-pressure current-limit fuse bushing holder is installed in the wall through the bushing when MTR connection according to the present invention,

8 is a front view of an insulated reduction switchgear configured with a KEPCO inlet panel unit and a wall through bushing in an LBS & MOF panel unit according to the present invention;

9 is a side view of an insulated reduction switchgear configured with a KEPCO inlet panel unit and a wall through bushing in an LBS & MOF panel unit according to the present invention;

10 is a rear view of an insulated reduction switchgear configured with a KEPCO inlet panel unit and a wall through bushing in an LBS & MOF panel unit according to the present invention;

11 is a front view of an insulated reduction switchgear configured with a wall through bushing in a PT & VCB panel unit according to the present invention;

12 is a side view of an insulated reduction switchgear configured with a wall through bushing in a PT & VCB panel unit according to the present invention;

13 is a rear view of an insulated reduction switchgear configured with a wall through bushing in a PT & VCB panel unit according to the present invention;

14 is a front view of an insulated reduction switchgear having a wall through bushing configured in an MTR & ACB power panel according to the present invention;

15 is a side view of an insulated reduction switchgear having a wall through bushing configured in an MTR & ACB power panel according to the present invention;

16 is a rear view of an insulated switchgear switchgear configured with a wall through bushing in an MTR & ACB power panel according to the present invention;

※ Brief Description of Drawings

10: KEPCO Inlet Panel Part 11: CH

12: VD 20: LBS & MOF Panel

21: LBS 22: High Pressure Korean Wave Fuse

23: LA 24: MOF

25: Power indicator 30: PT & VCB panel

31: PT 32: VCB

33: CT 34: Power indicator

40: TR & ACB power panel part 41: high pressure current-limit fuse

42: MTR 42 42: ACB

44: MCCB

100, 200, 300, 400, 500: wall through bushing

150, 250, 350, 450, 550: High Voltage Current Fuse Bushing Holder

The present invention can reduce the overall size of the switchgear by connecting the KEPCO lead panel part, LBS & MOF panel part, PT & VCB panel part, MTR & ACB power panel part of the switchgear through the wall through bushing. The present invention relates to an insulated reduction switchgear consisting of a wall through bushing capable of improving safety and workability.

In general, a switchgear is a device installed in a power plant, substation, or a building that is equipped with an electrical facility. A safety device, a meter, an indicator, a relay, and the like are placed inside to control the opening and closing of a converter or controlling a device. It is easily distinguished.

The transformer built in the conventional switchgear has an inlet transformer or a mold transformer, and is composed of a structure in which an automatic failure switchgear and a power fuse are integrated or not integrated.

1 is a cross-sectional view of a switchgear with an inlet transformer according to the prior art, Figure 2 is a cross-sectional view of a switchgear with a mold transformer according to the prior art, Figure 3 is an automatic failure section according to the prior art Sectional view of a switchgear with an integrated switch and power fuse.

As shown in Figures 1 to 3, the internal structure of the switchgear 1, the inlet 10 and the automatic failure section connected to the inlet 10 of the power receiving equipment is connected to the external power cable input from the outside Connected to the switchgear 20, the electric power fuse 30 connected to the automatic failure section switch 20, the transformer transformer current transformer 40 connected to the power fuse 30, and the transformer transformer current transformer 40 And a transformer 50. The cable branched between the automatic fail-over switch 20 and the power fuse 30 is connected to the arrester 60.

In such a switchgear, the inlet transformer 50 of FIG. 1 and the mold transformer 50 ′ shown in FIG. 2 are classified according to the type of transformer. In addition, as shown in Figure 3, the automatic failure section switch 20 and the power fuse 30 is divided into a separate switchgear integrated with the integrated switchgear.

As shown in FIGS. 1 to 3, in each switchgear 1, an inlet portion 10 to which an external power cable is connected is provided with an integrated termination connector 11, and an upper end of the integrated termination connector 11 is provided. The lug 13 is exposed, and the exposed lug 13 is connected to the cable extending from the automatic failure section switch 20.

In addition, the transformer current transformer 40 for the instrument is provided with a first terminal connecting member 41 and a second terminal connecting member 42, and the first terminal connecting member 41 and the second terminal connecting member 42, the power supply fuse 30 The cable extending from) and the cable extending from transformer 50 are respectively connected.

When the door of the switchgear configured as described above is opened, the lugs of the terminal connecting members 11, 41, and 42 and the connection portion of the cable are exposed. Therefore, there is a risk of electric shock when inspecting and maintaining switchboards. In addition, in order to prevent a short circuit caused by the exposed portion, there is a safety regulation that no part or device should be installed within a predetermined distance from the lug of the termination member.

According to such safety regulations, the density of switchboards is lowered, and thus the size of switchboards is inevitably increased.

The present invention is designed to solve the problems of the prior art as described above, it is possible to reduce the overall size of the switchgear, it is an object of the present invention to provide an insulation reduction type switchgear to improve the safety and workability.

Insulation reduction type switchgear made of a wall through bushing according to the present invention to achieve the above object,

Built-in Voltage Detector (VD) allows KEPCO (Korea Electric Power Corporation) to safely check the energization status of incoming voltage (RST) panel front doors and closes the barrier structure by wall through bushing (100) KEPCO incoming panel portion 10 made of, and

It is formed on one side of the KEPCO inlet panel part 10 and consists of LBS (air load switch: LOAD BREAK SWITCH), high pressure current-limit fuse, LA (lightning arrester), MOF (METERING OUT-FIT), and current indicator. LBS & MOF panel unit 20 consisting of a three-stage closed compartment between the partition wall and the device by the wall through bushing so that the LBS manual operation tool and the automatic control S / W operation status indicator can be safely operated in the front door.

PT (potential transformer), VCB (vacuum breaker: VACUUM CIRCUIT BREAKER), CT (current transformer), current-carrying indicator and PT, CT, test terminal and digital concentration in front door PT & VCB panel part consisting of a three-stage closed enclosure between the bulkhead and the device by wall through bushing for the protection relay, indication, and display device (DPMD) to be operated safely and externally monitored and controlled. 30,

It consists of high pressure current-limit fuse, MTR (mold transformer), air circuit breaker (ACB: AMGNETIC CONTACT CIRCUIT BREAKER), wiring breaker (MCCB: MAGNETIC CONTACT CIRCUIT BREAKER), PT, CT, test installed in the front door Terminal and digital integrated protection relay, indication and display control device (DPMD), and temperature indication relay for MTR installed on the back of the door are operated safely, so that the bulkhead and inter-device compartments can be closed by wall through bushings for external monitoring and control. It is achieved by being composed of the MTR & ACB power panel portion 40 made of a structure.

In addition, the wall through bushing (100, 200, 300, 400, 500) according to the invention is formed by connecting the clamp 110 including a terminal for fixing the conductor at both ends, as shown in FIG. A plurality of wings 120 are formed symmetrically with respect to the center portion in the circumferential direction along the side from the end to the center portion, and the connector 130 of an insulating material is formed in a cylindrical shape so as to penetrate between the panel portions in the center portion.

As shown in FIG. 5, the wall through bushings 100, 200, and 400 pass through a VD (voltage detector) 12 installed in the KEPCO inlet panel unit 10. When connected to the (11), or when connecting the MOF 24 and the secondary bus booth Basil 'I' shaped high-pressure current-limit fuse bushing holder (150, 250, 450) is formed.

The high-pressure current-type fuse bushing holder (150, 250, 450) is formed with a rectangular clamp (151, 251, 451) so that both ends are connected by bolts and nuts, between the clamp is a straight connecting rod (152, 252, 452 is connected, and the shaft coupling bolts 153, 253, 453 are formed so that the clamps 151, 251, 451 and the straight connecting rods 152, 252, 452 can be rotated by ± 90 °. .

The wall through the bushing 300, as shown in Figure 6, when connected to the high-pressure current-limiting fuse 22 of the LBS 21, or when connected to the LA 23 in the vertical direction '의' shape The high pressure current-limit fuse bushing holder 350 is formed.

Each of the high-pressure current-type fuse bushing holder 350 has a rectangular clamp 351 is formed to be connected to the bottom by a bolt and a nut, the straight connecting rod 352 is connected to the clamp 351, the clamp 351 Shaft joint bolt (353) is formed to be rotated ± 90 ° to the portion is connected to the straight connecting rod 352.

As shown in FIG. 7, the wall through bushing 500 has a high-pressure current-limit type fuse bushing holder 550 formed when the MTR 42 is connected to one side thereof.

Each of the high-pressure current-type fuse bushing holder 550 has a rectangular clamp 551 is formed so as to be connected to the top by a bolt and a nut, the straight connecting rod 552 is connected to the clamp 551, the clamp 551 Shaft joint bolt 553 is formed so as to rotate ± 90 ° to the portion that is connected to the straight connecting rod 552.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the insulated reduction switchgear made of a wall through bushing according to the present invention will be described in detail.

Figure 8 relates to a front view of the insulated reduction switchgear panel consisting of KEPCO lead panel portion, LBS & MOF panel portion according to the present invention, which is composed of KEPCO lead panel portion 10, LBS & MOF panel portion 20 .

In the present invention, the KEPCO inlet part, the LBS part, the MOF part, the PT part, and the VCB part form a high pressure part.

The KEPCO inlet panel unit 10, 22.9KV 3φ4W 60HZ from KEPCO (Korea Electric Power Corporation: KOREA ELECTRIC POWER CORPORATION) is introduced into the switchgear device through CH (Cable connection: CABLE HEAD) (11), voltage detector ( It detects the voltage flowing into the switchgear through VD: Voltage Detector (12) and is configured to safely check the energization state in the front door of KEPCO inlet voltage (RST) panel.

Then, it is connected by the LBS primary connection portion 21a of the one side and the wall through the bushing 100 is configured to be completely insulated as shown in FIG.

Here, the wall through the bushing 100 is formed by connecting the clamp 110 including a terminal for fixing the conductor at both ends, a plurality of wings 120 in the circumferential direction along the side from the both ends to the center portion relative to the center portion It is formed while being symmetrical with each other, the connector 130 of the insulating material in the center portion is formed in a cylindrical shape so as to pass through between the panel portion.

Wall through bushing according to the present invention has the characteristics of rated voltage 24KV, commercial frequency withstand voltage 50KV, lightning shock wave withstand voltage 125KV, rated breaking current 25KV, rated current 630A.

The LBS & MOF panel portion 20 is formed on one side of the KEPCO inlet panel portion 10, the LBS (air load switch: LOAD BREAK SWITCH) (21), high pressure current-limit fuse (22), LA (lightning arrester: LIGHTNING) ARRESTER) (23), MOF (24), energization indicator (25), and between the bulkhead and the device by wall through bushing for safe operation of LBS manual control panel and automatic control S / W operation status indicator in front door It consists of a three-stage closed enclosure structure, in which a plurality of LA (lightning arrester) 23 is formed in a vertical direction on the E-bus 26 side of the lower part, and the LA (lightning arrester) (23) Bushing-type fuse holder (PF) 350 is connected to the high-pressure current-limit fuse (22) to the clamp of. An LBS (load load switch) 21 is formed toward the upper side of the high-pressure current-flow fuse 22, and a wall through bushing connected to the KEPCO inlet panel part 10 on one side of the LBS primary connection part 21a. A 100 is formed, and the wall through bushing 200 for busbar connecting bar is connected to the MOF secondary bus 24a at one end of the LBS.

Here, the wall through bushing 100 when connected to CH (Cable Head) 11 through the VD (Voltage Detector) 12 installed in the KEPCO inlet panel unit 10 is shown in FIG. As described above, an I-shaped high pressure current-limit fuse bushing holder 150 is formed.

9 is a side view of an insulated reduction switchgear composed of a KEPCO inlet and an LBS & MOF unit according to the present invention, which includes an LBS 21, a high pressure current-limiting fuse 22, a LA 23, and a MOF ( 24, the energization indicator 25 is formed and consists of the 1st compartment part 20a, the 2nd compartment part 20b, and the 3rd compartment part 20c formed in the metal closing type | mold.

The first compartment 20a forms a compartment in a metal closure shape, and a KEPCO inlet wall through bushing 100 is formed at one side of the upper end of the inside, and an LBS 21 at the lower end of the KEPCO inlet wall through bushing 100. ) Is formed, and the high-pressure current-limiting fuse 22 is formed at the lower end of the LBS 21, and the LA 23 in the vertical direction is formed at the lower end to be connected to the high-pressure current-limiting fuse 22.

The second compartment 20b forms a compartment in a metal closed shape, and a MOF 24 is formed at one side of the inner lower end thereof, and a wall passage for connecting the second compartment to one side (left side in FIG. 9) of the MOF 24 is formed. The bushing 300 is formed, and a third wall connecting bushing 400 is formed at one side of the MOF 24.

The third compartment part 20c forms a compartment in a metal closure shape, and a secondary bus booth basil in which a plurality of busbar bushing wall through bushings 200 are installed is formed.

By forming a three-stage compartment or a multi-stage compartment in the insulated reduction switchgear composed of the KEPCO inlet 10 and the LBS & MOF unit 20, the flames and the fly-bys in the second accident occurring in the compartment are different. It can be prevented from spreading and can be configured to naturally discharge harmful gases and smoke to the outside through the exhaust port.

10 relates to a rear view of an insulated reduction switchgear consisting of a KEPCO inlet and an LBS & MOF unit according to the present invention, which is composed of an LBS & MOF unit 20 and a KEPCO inlet unit 10.

The LBS & MOF unit 20 is formed in the lower end of the T, S, R consisting of the MOF 24, the energization indicator 25 is formed on the top of the MOF 24, the energization indicator 25 on the top A wall bus bushing 400 for connecting the secondary busbar busbar is formed, and a wall bus bushing 200 for connecting the busbar busbars is connected to the wall bus bushing 400 for connecting the secondary bus busbar.

Here, the wall through bushing 400 is connected to the MOF and the secondary bus booth chamber as shown in FIG. 5, and an I-shaped high pressure current-limit fuse bushing holder 450 is formed.

And, when the secondary busbar bushing connection wall through bushing 400 and the busbar busbar connecting wall through bushing 200 is connected, as shown in Figure 5, the I-shaped high-voltage current-limit fuse bushing holder ( 250) is formed.

The KEPCO inlet 10 is formed on one side of the LBS & MOF unit 20.

11 is a front view of an insulated reduction switchgear composed of a PT & VCB panel unit according to the present invention, which constitutes a PT & VCB panel unit 30.

The PT & VCB panel unit 30 is PT (31), VCB (vacuum breaker: VACUUM CIRCUIT BREAKER) 32, CT (33), the current indicator 34, PT, CT in the front door , Three-stage compartment between barriers and devices by wall-through bushings for safe operation of test terminals and digital central protection relays, indications and display control devices (DPMD) (not shown) It is composed of a closed structure, which is formed at the bottom of the 24KV VCB (32), the top of the VCB 32 is formed a door type AUX RY-P (35), the bus bar on the top of the AUX RY-P (35) A wall through bushing 200 for busbar connection is formed in connection with the VCB primary bus 24a.

12 is a side shaving of an insulated switchgear switchgear composed of a PT & VCB panel unit according to the present invention, which includes a PT (31), a VCB (32), a CT (33), and an energization indicator (34). The first compartment 30a, the second compartment 30b, and the third compartment 30c are formed in a metal closed shape.

The first compartment part 30a forms a compartment in a metal closure type, and a secondary bus bar 36 and a third bus bar 37 are formed side by side on one side, and a PT 31 is formed on one side of the upper side. Then, the CT 33 is formed on one side of the lower end.

The second compartment part 30b forms a compartment with a metal closure, and a circuit breaker 38 is formed.

The third compartment part 30c forms a compartment in a metal closed shape, and an LV operating panel 39 is formed.

By forming a three-stage compartment or a multi-stage compartment inside the insulation reduction type switchgear consisting of the PT & VCB panel unit 30, it prevents the flame and the fly products from spreading to other compartments during a secondary accident occurring in the compartment, Gas and smoke can be configured to naturally discharge to the outside through the exhaust port.

FIG. 13 relates to a rear view of an insulated reduction switchgear consisting of a PT & VCB panel unit according to the present invention, which is provided with a 24KV VCB 32 formed at one side of a lower side thereof, and a plurality of PTs 31 mounted at an upper side of the VCB 32. ) Is formed, and a metal plate is formed in a vertical direction between the plurality of PTs 310, respectively, and the wall through bushing 200 for bus bar connection connected to the bus bar part connected to the VCB secondary bus 24a on one side of the PT 31. Is formed.

14 is a front view of an insulated reduction switchgear consisting of an MTR & ACB power panel unit according to the present invention, which is composed of an MTR & ACB power panel unit 40.

The MTR & ACB power panel unit 40 has a high-pressure current-limit fuse (41), MTR (42), ACB (43), MCCB (wire breaker: MAGNETIC CONTACT CIRCUIT BREAKER) 44, the front door PT, CT, test terminal and digital central protection relay, indication, and display control device (DPMD) installed in the door, and MTR temperature indication relay installed on the rear of the door operate safely through the wall through bushing to monitor and control from the outside. Compartment of the partition and the inter-device compartment, which is formed MCCB (44) is formed on one side of the lower side, ACB (45) is formed on the top of the MCCB (44), two on each side relative to the center panel Is formed.

FIG. 15 is a side view of an insulated switchgear switchgear consisting of an MTR & ACB power panel unit according to the present invention, which is formed by forming a wall through-bush bushing (B) 200 connected to a busbar bus bar at an upper end thereof, and forming a compartment thereof. MTR panel connection wall through bushing (E) (500) is formed on one side of the busbar bushing connecting wall bushing (B) (200) to form a compartment, and the MTR panel connecting wall through bushing (500) on one side TR high pressure current-limit fuse bushing holder 550 is connected, a mold-type MTR (42) is formed at the lower end of the MTR dedicated high-pressure current-type fuse bushing holder 550, the door-type inspection opening on one side of the mold MTR (42) An 47 is formed and an ACB 43 and an MCCB 44 are formed at one side of the door-type check opening 47.

16 is a rear view of an insulated switchgear switchgear consisting of an MTR & ACB power panel unit according to the present invention, which has a plurality of mold-type MTRs 42 formed side by side on a lower side thereof, and an MTR on top of the mold-type MTR 42. A dedicated high pressure current limit fuse bushing holder 550 is formed, and a wall through bushing (E) 500 for connecting an MTR panel part is formed in the high pressure current limit fuse bushing holder 550 for the MTR, and the MTR panel part is connected. Wall through the bushings (E) (500) for both sides of the bus bar connecting bushing bushings (B) (200) is formed.

The wall through-hole bushing and the high-pressure current-limit fuse bushing holder connected to the wall through bushing according to the present invention can reduce the size of the switchgear, which is described before and after the development of the switchgear. , As shown in Table 4.

Here, the KEPCO inlet panel portion, LBS portion, MOF portion, PT portion, VCB portion forms a closed metal compartment to form a high pressure portion, the MTR & ACB power panel portion forms a low-pressure power lamp, rectifier.

Standard before and after development of high voltage part Product Name Pre-Development Standard Post Development Standard W × H × D W × H × D KEPCO Inlet 0 550 × 2550 × 1200 LBS Department 1600 × 2550 × 2500 1300 × 2550 × 2000 MOF Department 1400 × 2550 × 2500 1200 × 2550 × 2000 P T part 1400 × 2550 × 2500 VCB section 1400 × 2550 × 2500 3050 × 2550 × 2000 system 5800 × 2550 × 2500 3050 × 2550 × 2000

Table of overall specifications for high voltage parts Standard name Pre-Development Standard Post Development Standard Collapse vs Rain Increase feeling Full width (W) 5800 3050 ○ About 48% Height (H) 2550 2550 ○ ○ Depth (D) 2500 2000 ○ About 20%

As such, through the wall through bushing and the high pressure current-limit fuse bushing holder connected to the wall through bushing according to the present invention, the overall width (W) of the high voltage switchboard of the switchgear can be reduced by 48%, and the depth (D) is 20%. It can be reduced.

Standard before and after development of MTR & ACB power panel Product Name Standard Pre-Development Standard Post Development Standard W × H × D W × H × D MTR # 1 3φ 600KVA 22.9 / 380-220V 2200 × 2550 × 2000     2000 × 2550 × 3000 Power light part # 1 ACB # 1 380-220V 800 × 2350 × 1500 Power light part # 2 ACB # 2 380-220V 800 × 2300 × 1500 MTR # 2 3φ 600KVA 22.9 / 380-220V 2200 × 2550 × 2000    2000 × 2550 × 3000 ACB # 2, # 3 380-220 V 800 × 2550 × 2000 380-220V power section 800 × 2350 × 1500 Rectifier & BATT DC110V 800 × 2350 × 1500     600 × 2550 × 900 UPS 110V DC Breaker Control AC220V Half-Light & Emergency Light ○ Power Control-Site Monitoring Control-Remote Control Using KTA LINE Separate control room system 8400 × 2500 × 2000 4600 × 2550 × 3000

Table of overall specifications for MTR & ACB power panels Standard name Pre-Development Standard Post Development Standard Collapse vs Rain Increase feeling Full width (W) 8400 4600 ○ About 46% Height (H) 2550 2550 ○ ○ Depth (D) 2000 3000 About 44% ○

As such, through the wall through bushing according to the present invention and the high pressure current-limit fuse bushing holder connected to the wall through bushing, the overall width (W) of the MTR & ACB power panel of the switchgear can be reduced by 46%, and the depth ( D) is increased by about 44%.

As described in detail above, according to the present invention, the wall through bushing is formed between the KEPCO inlet panel, LBS & MOF panel, PT & VCB panel, MTR & ACB power panel of the switchgear panel, thereby reducing the overall size of the switchgear panel. In addition, it has a good effect to improve safety and workability in work.

Claims (5)

Built-in Voltage Detector (VD) allows KEPCO (Korea Electric Power Corporation) to safely check the energization status of incoming voltage (RST) panel front doors and closes the barrier structure by wall through bushing (100) KEPCO incoming panel portion 10 made of, and It is formed on one side of the KEPCO inlet panel part 10 and consists of LBS (air load switch: LOAD BREAK SWITCH), high pressure current-limit fuse, LA (lightning arrester), MOF (METERING OUT-FIT), and current indicator. LBS & MOF panel part consisting of a three-stage closed compartment between the partition wall and the device by wall through bushings (200, 300, 400) so that the LBS manual operation tool and the automatic control S / W operation status indicator can be safely operated in the front door. )Wow, The bus bar bushing 200 for busbar bar connection of the LBS & MOF panel unit 20 and the wall bushing bushing 200 formed at one side of the upper part are electrically connected to each other, and a PT (instrument transformer: Potential) is formed therein. Transformer), VCB (vacuum breaker: VACUUM CIRCUIT BREAKER), CT (Current Transformer: Current Transformer), energization indicator, PT, CT, test terminal and digital central protection relay, indication, display control device PT & VCB panel unit 30 consisting of a three-stage compartment closed structure between the partition wall and the device by the wall through bushing 200 so that DPMD: Digital Protection & Measurement Device can be safely operated and externally monitored and controlled; The wall through bushing 200 of the PT & VCB panel portion 30 and the bus bar bushing 200 for connecting the busbar bar connected to the VCB secondary bus 24a at one upper end thereof are electrically connected to each other. High pressure current-limit fuse, MTR (mold transformer), air circuit breaker (ACB: AMGNETIC CONTACT CIRCUIT BREAKER), wiring breaker (MCCB: MAGNETIC CONTACT CIRCUIT BREAKER), PT, CT, test terminal installed in front door In addition, the digital central protection relay, indication, and display control device (DPMD) and the temperature indication relay for the MTR installed on the rear of the door can be operated safely to monitor and control from the outside. Insulation reduction type switchgear made of a wall through bushing, characterized in that consisting of MTR & ACB power panel portion 40 made. The wall through bushing (100, 200, 300, 400, 500) Clamp 110 including a terminal for fixing the conductor at both ends is connected and formed, a plurality of wings 120 in the circumferential direction along the side from the both ends to the center portion is formed while being symmetrical with respect to the center portion, Insulation reduction type switchgear made of a wall through bushing characterized in that the connector 130 of the insulating material is formed in a cylindrical shape so as to pass through between the panel portion. The wall through bushing (100, 200, 400) of claim 2, Connected to CH (Cable Head) (11) via VD (Voltage Detector) (12) installed in KEPCO Inlet Panel (10), or connected to MOF (24) and Secondary Bus Booth Basil Insulation reduction type switchgear consisting of a wall through the bushing, characterized in that the 'I' shaped high-pressure current-limit fuse bushing holder (150, 250, 450) is formed. 3. The wall through bushing 300 is When connected to the high pressure current-limit fuse 22 of the LBS 21, or when connected to the LA 23 in the vertical direction '방향' shaped high-pressure current-limit fuse bushing holder 350 is characterized in that it is formed Insulated reduction switchgear consisting of wall through bushing. 3. The wall through bushing 500 is When the MTR (42) is connected to one side of the insulation contraction type switchgear made of wall through bushings, characterized in that the high-pressure current-limiting fuse bushing holder 550 is formed.

Images