The 250 MW unit is very large and typically uses generator-transformer group wiring, so the generator and step-up transformer are protected together
"Electrical Design Manual of electrical engineering (electrical secondary part)》? There are drawings on page 680
But they are not very clear. You can do it yourself and draw it in CAD
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The installation process of marine generators, please explain in detail.
The specific steps are divided into three steps:
(1) Measure the vertical and horizontal center lines of the foundation and the unit. "The unit is set up, the lines must be "drawn" according to the pre-designed drawings", know the longitudinal and transverse center lines of the foundation. and the unit as well as the positioning lines of the shock absorbers 2) Lifting the unit When lifting, a sufficiently strong steel cable must be used.be used to cover the lifting part of the unit. It should not be placed on the generator shaft or damage the oil pipe and dashboard. Lift the unit according to the unit lifting and installation technical regulations, align the center line of the foundation and the unit shock absorber, hoist the unit to the specified position and level it. (3) Unit Leveling Use pads to level the unit. The method to check if the unit is padded flat is to open the engine cylinder head and place the level on the upper end surface of the cylinder (i.e. the processing reference surface) for inspection . You can also use a level to check the datum plane of the diesel flywheel or the extended end of the crankshaft. Its installation accuracy is that the horizontal longitudinal and transverse deviation does not exceed 0.1 mm per meter. Of course, plus the aboveion is higher, the better. There should be no gaps between the skate iron and the bottom of the machine base to ensure uniform stress.
The following is our shipyard's installation process for STX main engine, please refer to it.
1. Installation Procedure – Installation Procedure
1.1 After welding the structure foundation, draw the center line of the generator set and the foundation at the location of the elastic supports according to the main engine. installation drawing. Drill φ22 holes in the top foundation plate for the M20 fixing screws. Noticed ! Check the location of the elastic mounting holes before drilling the φ22 holes.
After the base welding inspection is completed, according to the installation drawing. Host The installation diagram outlines the center line of the host when installed, the position of the transverse center line of eachcushioning pad on base and bolt hole locations. Drill a φ22 hole (M20 bolts). Notice! Before drilling the φ22 hole, check and confirm the actual location of the bolt hole on the vibration damping pad.
1.2 Grind the foundation at the resilient support locations if necessary, then inspect the contact conditions between the top of the foundation and the flat plate with a 0.1 mm feeler gauge and a thickness gauge. The thickness should not be inserted.
p>Use a flat plate to grind the main base board at the position of the vibration damping pad to ensure good contact between the flat plate and the base so that the 0.1mm feeler gauge cannot be inserted.
1.3 Mount the conical elements on the base frame support using four M20 bolts screwed into the tapped holes of the upper casting (5) and tighten to 150 Nm (if the conical elements do not have not beenfactory fitted); remove the fixing bolt (7), spring washer (8) and upper locking ring (6) from the conical element, see fig. 1.
Use 4 M20 bolts to fix the cushioning pad. Install on the generator set base with a tightening torque of 150 Nm (if the manufacturer has not pre-installed the shock absorber pad), then remove the fixing bolts (7), spring washers (8) and lock ring upper (6); the shock absorber cushion. See figure 1.
1.4 Position the four jack bolts into the tapped holes (9) in the casting (1), see fig 1; Position the cylinder bolts with a minimum clearance of 40 mm, see fig 2;
Place the adjustment bolt into the threaded hole (9) in the cushion base (1), see Figure 1 and unscrew the adjustment bolt at least 40mm out of the cushion base damper, see Figure 2;
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Conical element Fig1 Figure 1
Elementconical Fig2 Figure 2
1.5 Raise the generator set with elastic supports in the correct position as in the installation drawing, lower the generator set until it rests completely on the foundation, and l The assembly must be aligned with the foundation holes before work begins to avoid subsequent removal of the assembly. Verify that all jack bolts are in full contact with the foundation.
Will generate. electricity The vibration damping unit and cushion are hoisted onto the ship as a whole, and the main engine is placed in the correct position according to the installation drawing. The base fully supports the weight of the main generator and the bolt holes on the. the generator set and the base panel are aligned to avoid moving the generator set later. Check that all adjustment bolts are in full contact with the base.
1.6 Check that allInternal pads can be turned easily using a wrench. If this is not possible, turn the four ram bolts in the cast base clockwise or counterclockwise to release the internal pad, until all the internal buffers are rotated. the internal pads can be rotated freely.
Use a wrench to turn the pad screw to see if it can turn easily. If you cannot turn the pad screws, turn the adjustment bolt up or down to relieve the weight of the pad screws until all the pad screws can turn freely.
1.7 If all internal pads can rotate freely, allow the tapered elements to sit for 48 hours.
If all internal pads can rotate freely, allow the tapered elements to sit for 48 hours . .When turning, let the cushioned cushion resteur for 48 hours.
1.8 Adjusting the tapered elements after 48 hours.
After letting it sit for 48 hours, adjust the vibration damping pad.
1.8.1 After the conical elements have been deflected under static load for 48 hours, the loaded height (H1), see fig 2, must be measured when leveling the installation. make sure individual media are not overloaded.
The vibrating cushion will deform after 48 hours of static loading, then measure the loading height of the vibrating cushion (H1, see Figure 2). Particular attention should be given to ensuring that each cushioning pad is not overloaded during the leveling process.
1.8.2 The variation in height under load should not exceed 2 mm and should ideally be less; The loaded height can be measured between the top case and the H-shaped base case, on both sides (see fig 2). The difference between thetwo sides (TB1 and TB2, see fig. 3) of a conical mounting must not exceed 0.6 mm.
The difference between the load heights of each vibrating cushion must not exceed 2 mm . , and the smaller the height difference, the better; measure the height H1 between the base of the shock absorber cushion and the shell is the load height, see Figure 2. Measure the load height of the shock absorber cushions on both sides of the host. . In addition, the difference in height between opposite sides of the same shock absorber pad (TB1 and TB2, see Figure 3) cannot exceed 0.6 mm.
If then
The difference exceeds
2 mm Level the tapered members by adjusting the lifting bolts, starting by tThe conical elements with the greatest deviation
The difference does not exceed 2 mm. The height of the steel wedge can be measured
See the table above if the difference between the load heights of each vibrating pad greater than 2 mm, starting from the shock absorber pad with the largest difference, turn the adjustment bolts in order to adjust the level of the shock absorber pads.
If the difference between them is less than 2mm, you can start measuring the required height of the live pad.
Fig3 conical element Figure 3
1.9 Measure the steel shim at several points to obtain the greatest possible accuracy during preparation. Make sure the minimum height of. the steel shim measures 40 mm to ensure future replacement of the conical elements. Record the measurement data and number each steel shim with each taper element, machine the steel shim according to the measurement data. Drill the mounting holes in the steel shim according to specifications. dimensions of the tapered base box.
Take as many points as possible (at least 4 corners of the shock pad) to measure the distance between the panelbase and the lower surface of the shock absorber pad to ensure greater precision. Ensure that the height of the movable cushion is not less than 40mm to facilitate future replacement of the shock absorber cushion. Record the measurement data, number the moving pads and vibration absorbing pads one by one, and process the moving pads according to the actual size. Drill holes in the moving pad based on the bolt hole locations on the vibrating pad base.
1.10 Turn the internal pad counterclockwise (up) until it contacts the molded base to secure the loaded height.ht of each conical element. Raise the generator set with a hydraulic jack, remove all jack bolts.
Adjust the buffer screw upward until it touches the base of the shock absorber to ensure the height of the amortization chargeisseur. Use a jack to raise the generator and remove all the adjustment bolts.
1.11 Position each completed steel block according to the number, lower the generator until it rests completely on itself.
Place the treated moving skids in the exact position according to the number, slowly lower the generator set until the generator set is completely supported by the moving blocks.
1.12 Adjusting the internal pad.
Adjust the pad screw.
Turn the inner pad clockwise (down) until it contacts the steel shim, then turn it counterclockwise. clockwise (upwards) until it contacts the base casting
Turn downwards. cushion screw until it touches the movable cushion, then turn the cushion screw upward until it touches the base of theshock absorber pad.
Turn the inner pad two full turns clockwise (down), and the inner pad does not contact the steel shim.
Adjust the pad screw two more turns clockwise (downward), and the pad screw does not touch the steel shim. It will hit the spacer under tension.
1.13 Lock the internal pad by raising the upper locking ring and turning it to the nearest threaded hole, then secure it with the fixing bolt and spring washer, see fig. 1.
Reinstall The upper locking ring locks the pad screw, see Figure 1.
1.14 Secure all tapered members and steel shims to the foundation with four M20 bolts and conical self-locking nuts. Lubricate the threads with engine oil and tighten to 200 Nm.
Use. Four M20 bolts and self-locking nuts securethe vibration damping pad and the movable pad at the host base. Apply butter to the bolts and torque them to 200 Nm.
Note! After all work has been completed, the buffer clearance must be checked, see points 1.12 and 1.13.
Note! After all installation work is completed, the buffer screw should be inspected. For specific steps, refer to 1.12 and 1.13 above.