Internal Exhaust Tunnel

Assembly of Internal Exhaust Tunnel – 12/17.5 kV

Follow the steps 1–10 to assemble the internal exhaust tunnel.

Without pressure relief duct	With pressure relief duct

Step 1: Assembly of Support Frame

Follow the below steps to assemble the support frame (Figure 75):

1. Attach the support frame (1) to the cubicle, and install the bolts (2) along with washers (3).

Figure 75
Installation of the Support Frame

Step 2: Assembly of Tunnel Cover

Follow the below steps to assemble the tunnel cover (Figure 76):

1. Attach the tunnel covers (1) to the cubicle and to the support frame, and install the bolts (3) along with washers (2) on both front and back side of the tunnel cover (1).

2. Attach the tunnel covers (1) together, and install the bolts (4) along with washers (5), and hexagonal nuts (6) on both front and back side of the tunnel cover (1).

Figure 76
Installation of the Tunnel Cover

Step 3: Assembly of Absorber Support

Follow the below steps to assemble the absorber support (Figure 77):

1. Attach the absorber supports (1) to the tunnel cover, and insert the round rivet nuts (2).

2. Install the bolts (3) along with washers (4).

3. Insert the hexagonal rivet nuts (5) on both front and back side of the tunnel cover.

Figure 77
Installation of the Absorber Support

Step 4: Assembly of Tunnel Top Middle Cover

Follow the below steps to assemble the tunnel top middle cover (Figure 78):

1. Attach the tunnel top middle covers (1) to the tunnel cover, and install the bolts (2) along with washers (3).

Figure 78
Installation of the Tunnel Top Middle Cover

Step 5: Assembly of Tunnel Top Middle Cover

Follow the below steps to assemble the tunnel top cover (Figure 79):

1. Attach the tunnel top covers (1) to the tunnel top middle cover, and install the bolts (2) along with washers (3).

2. Attach the tunnel top covers (1) together, and install the bolts (4) along with washers (5), and hexagonal nuts (6).

Figure 79
Installation of the Tunnel Top Middle Cover

Step 6: Assembly of Tunnel Side Cover

Follow the below steps to assemble the tunnel side cover (Figure 80):

1. Attach the tunnel side covers (1) to the tunnel top cover, and install the bolts (3) along with washers (2).

Figure 80
Installation of the Tunnel Side Cover

Step 7: Assembly of Tunnel Deflector

Follow the below steps to assemble the tunnel deflector (Figure 81):

1. Attach the tunnel deflector (5) and tunnel deflector support (1) to the tunnel top cover, and install the bolts (6) along with washers (7).

2. Attach the tunnel deflector support (1) to the tunnel deflector (5), and install the bolts (2) along with washers (3), and hexagonal nuts (4).

3. Attach the tunnel deflector (5) together, and install the bolts (2) along with washers (3), and hexagonal nuts (4).

Figure 81
Installation of the Tunnel Deflector

Step 8: Assembly of Absorber

Follow the below steps to assemble the absorber (Figure 82):

1. Install the absorber (1) to the tunnel top cover, and install the bolts (3) along with washers (2).

Figure 82
Installation of the Absorber

Step 9: Assembly of End Frame Bracket

Follow the below steps to assemble the end frame brackets (Figure 83):

1. Insert the round rivet nuts (1) to the end frame brackets (4).

2. Install the end frame brackets (4) to the tunnel cover, and install the bolts (3) along with washers (2).

Figure 83
Installation of the End Frame Bracket

Step 10: Assembly of End Cover

Follow the below steps to assemble the end covers (Figure 84):

1. Attach the end plates (4) to the tunnel covers, and install the bolts (1) along with washers (2), and hexagonal nuts (3).

2. Attach the end covers (7) to the tunnel covers, and install the bolts (1) along with washers (2), and hexagonal nuts (3).

3. Attach the end covers (7) to the end plates (4), and install the bolts (5) along with washers (6).

4. Attach the tunnel end wall coupler (8), and install the bolts (5) along with washers (6).

Figure 84
Installation of the End Cover (Sheet 1 of 2)

Figure 84
Installation of the End Cover (Sheet 2 of 2)

Assembly of Internal Exhaust Tunnel – 24 kV

Follow the steps 1–10 to assemble the internal exhaust tunnel.

Without pressure relief duct	With pressure relief duct

Step 1: Assembly of L-Bracket

Follow the below steps to assemble the L-bracket (Figure 85):

1. Insert the rivet nuts (1) on the top panel of the LV Compartment.

2. Attach the L-bracket (4) to the LV compartment, and install the bolts (2) along with washers (3).

Figure 85
Installation of the L-Bracket

Step 2: Assembly of Front Cover

Follow the below steps to assemble the front cover (Figure 86):

1. Insert the rivet nuts (2) to the front cover (1).

2. Attach the front cover (1) to the L-bracket, and install the bolts (3) along with washers (4).

Figure 86
Installation of the Front Cover

Step 3: Assembly of Support Frame

Follow the below steps to assemble the support frame (Figure 87):

1. Insert the round rivet nuts (1) on top of the cubicle.

2. Insert the hexagonal rivet nuts (2) to the support frame (5).

3. Attach the support frame (5) to the front cover and to the cubicle, and install the bolts (3) along with washers (4).

4. Attach the corners of the support frame (5) to the front cover and to the cubicle, and install the bolts (6) along with washers (7).

Figure 87
Installation of the Front Cover (Sheet 1 of 2)

Figure 87
Installation of the Support Frame (Sheet 2 of 2)

Step 4: Assembly of End Frame

Follow the below steps to assemble the end frame (Figure 88):

1. Insert the round rivet nuts (1) on top of the cubicle.

2. Insert the hexagonal rivet nuts (2) to the end frame (5).

3. Attach the end frame (5) to the front cover and to the cubicle, and install the bolts (3) along with washers (4).

4. Attach the corners of the end frame (5) to the front cover and to the cubicle, and install the bolts (6) along with washers (7).

Figure 88
Installation of the End Frame (Sheet 1 of 2)

Figure 88
Installation of the End Frame (Sheet 2 of 2)

Step 5: Assembly of Rear Cover

Follow the below steps to assemble the rear cover (Figure 89):

1. Attach the rear cover (3) to the rear side of the frames, and install the bolts (1) along with washers (2).

2. Attach the top of rear cover (3) to the frames, and install the bolts (1) along with washers (2).

Figure 89
Installation of the Rear Cover

Step 6: Assembly of Top Cover

Follow the below steps to assemble the top cover (Figure 90):

1. Insert the rivet nuts (1) to the top of front cover and rear cover.

2. Insert the rivet nuts (1) to both left and right sides of top cover (5) for the inter panel connection.

3. Insert the rivet nuts (1) to the absorber support (4), attach the absorber support (4) to the top cover (5), and install the bolts (2) along with washers (3).

4. Attach the top covers (5) to the support frames and end frames, and install the bolts (2) along with washers (3).

5. Attach the top covers (5) together, and install the bolts (2) along with washers (3).

Figure 90
Installation of the Top Cover (Sheet 1 of 2)

Figure 90
Installation of the Top Cover (Sheet 2 of 2)

Step 7: Assembly of Absorber

Follow the below steps to assemble the absorber (Figure 91):

1. Install the absorber (3) to the top cover, and install the bolts (1) along with washers (2).

Figure 91
Installation of the Absorber

Step 8: Assembly of Deflector

Follow the below step to assemble the deflector (Figure 92):

1. Attach the deflector (3) to the top cover, and install the bolts (1) along with washers (2).

Figure 92
Installation of the Deflector

Step 9: Assembly of Deflector Support

Follow the below steps to assemble the deflector support (Figure 93):

1. Insert the rivet nuts (1) to the deflector to attach the deflector support (4).

2. Attach the deflector support (4) to the deflector, and install the bolts (2) along with washers (3), and hexagonal nuts (5).

Figure 93
Installation of the Deflector Support (Sheet 1 of 2)

Figure 93
Installation of the Deflector Support (Sheet 2 of 2)

Step 10: Assembly of End Cover:

Follow the below steps to assemble the end cover (Figure 94):

1. Insert the rivet nuts (1) to the sides of left and right end frame.

2. Attach the end cover (4) to the end frame, rear cover, front cover, and top cover, and install the bolts (2) along with washers (3).

Figure 94
Installation of the End Cover