Application of Heat-shrinkable Pipe in Fan Installation

- Apr 05, 2019-

Wind turbine is a necessary tool for wind power generation. Insulation protection is the first consideration in the installation process of wind turbine. It is mentioned that insulation protection of course lacks the use of heat-shrinkable tubes. Now let's learn where to use heat-shrinkable tubes in the installation process of wind turbine.

I. Supervision and Inspection of Conductive Rails before Lifting

1.1 The surface of the conductive rail is coated with plastic paper (dust-proof and moisture-proof). Before installation of tower drum, check whether all plastic paper is cleared.

1.2 Two persons cooperate to dismantle the wrapping at both ends of the conductor rails of each tower barrel, and use megohm meter or insulation meter to test the insulation between the conductor rails and to the ground. The insulation value of 1000V shaking table for stator and rotor conductive rails should be greater than or equal to 250M.

1.3 With the cooperation of two persons, the wrapping at both ends of the conductive rail of each tower barrel was removed, and the multimeter was used to continuously test the conductive rail between and to the ground. After this content is finished, the wrapping at both ends of the conductive rail will be restored to prevent foreign bodies from falling into the tower barrel when it is installed. The conductive rail of the rotor uses the ohmic or diode gear of the multimeter.

1.4 Check the corresponding models of the upper and lower junction boxes of the stator and rotor of the conductive rail.

1.5 Before installation, the section of conductive rail of each tower barrel is wrapped tightly.

II. Inspection of Tower Tube Lighting and Power Supply

2.1 The insulating layer of the cable is not damaged and the wear area needs to be protected by heat shrinkable tube.

2.2 The insulation of lighting phase line to ground meets the requirements.

2.3 The phase-to-ground insulation of socket meets the requirements.

2.4 All plugs and sockets are undamaged.

3. Opening Inspection

3.1 Check the number of equipment in the box according to the packing list.

3.2 There is no damage on the surface of stator and rotor cables.

3.3 Other accessories and equipment are not damaged.

4. Grounding inspection after hoisting

Note: After the hoisting work is completed, the grounding of main facilities should be completed at the first time to prevent lightning strike and damage of equipment.

Inspection criteria: The grounding fixing stud replacement must be cleaned up thoroughly, especially the grounding flat iron and platform bracket grounding replacement must be thoroughly painted on both sides. Grounding bolt must be galvanized material, gasket matching and correct direction, reliable press connection.

4.1 Tower bottom grounding system includes foundation ring grounding and bottom tower barrel grounding.

4.2 The equipotential plate is welded on the flange of tower foundation. Before connecting the ground wire, the surface of the equipotential plate must be rusted and polished to ensure good contact.

4.3 Inverter grounding, platform grounding, stator-rotor junction box grounding and box-to-ground cable are all assembled on the tower base equipotential plate.

4.4 The flexible connector of tower barrel is installed, the connecting part is rusted and polished smoothly. The dirt of the connecting part must be removed to ensure that the connecting part is clean, smooth and well contacted.

4.5 Angle grinder is used to polish the surface paint on the grounding surface of tower foundation platform to expose all metal parts, install grounding cables and tighten bolts.

4.6 The installation of carbon brushes for main shaft locking disc grounding and for yaw bearing grounding is reliable. Carbon brush grounding surface without dirt or rust.

V. Installation of Conductive Rails in Transition Section

5.1 Check the surface cleanliness and smoothness of connectors to ensure no dirt and dust.

5.2 Check whether the connector insulation plate is damaged or broken.

5.3 Measure whether the reserved distance of conductive rail between towers and cylinders corresponds to the size of conductive rail in transition section.

5.4 Whether the surface of the aluminium bars at both ends of the transition section of the conductive rail is smooth or not.

5.5 The side bolts of the rear cover plate of the conductive rail have been installed.

5.6 Check whether the bolt moment of the conductor rail connector meets the requirements. The standard moment is 90Nm.

5.7 Check whether the metal surface of the fixed conductive rail connector is in full contact.

5.8 side bolts of front cover plate of conductive rail have been installed.

After the installation of 5.9 conductive rail, the equilibrium resistance of each phase should be measured by bridge, and the difference of resistance between each phase should be less than 5%(excluding the theoretical resistance of the joint, KLM06451 is 27.3*10-6_/m, KLM14451 is 25.6*10-6_/m).

6. Cable wiring of stator and rotor

6.1 The suspension part of stator and rotor cables is natural and smooth, without distortion and intertwining.

6.2 The distance between stator and rotor cables and U-shaped hole platform is 2.6-3 M.

6.3 The cable grouping is fixed firmly on the semi-circular saddle bridge, beautiful and no cross phenomenon.

6.4 Steel straps are securely tied, rubber sheets are used between cables to protect them, and the wrapping is tight.

7. Power and control cables in engine room

7.1 The cable hanging part is natural and smooth, without distortion and intertwining.

7.2 The cable is 2.6-3 m from the U-shaped hole platform.

7.3 The cable grouping is fixed firmly on the semi-circular saddle bridge, beautiful and no cross phenomenon.

7.4 The cable is fixed firmly on the semi-circular saddle bridge, beautiful and no cross phenomenon.

7.5 The cable is routed along the cable groove of the tower barrel to the base of the tower. The route is correct and no other holes are bypassed, especially at the platform of the tower barrel.

7.6 After cables are wired to the tower base, each spare part is coiled and tied neatly on the tower base. There is no disorder, intertwining and random stacking.

8. Cable binding and protection

8.1 Platform cable hole on top of tower barrel, rubber skin around the hole has been installed.

8.2 Rubber skin around cable ring bracket has been installed.

8.3 Rubber skin around two U-shaped holes has been installed. Rubber skin wrapped cables are firm and straps are firmly tied.

8.4 The cables are grouped in semi-circular and circular saddle bridges with steel straps. The cables are protected by open silica gel tubes and are tightly wrapped.

8.5 Cables arranged along the cable groove of the tower drum are tied with straps every 1 meter.

8.6 Align the stator and rotor of generator side. And do a good job of phase line identification.

8.7 Reserve sufficient position according to wiring position, remove redundant cable and lock lock lock sleeve.

9. Inspection of Cable Head Production

9.1 Verify the use of cable joints corresponding to stator and rotor cable specifications to prevent joint misconnection.

9.2 The shearing plane of the cable should not be oblique.

9.3 Strip the insulating skin of the cable head according to the length of the inlet pipe of the copper nose. The copper wire of the cable can not be dispersed. All the stripped cables are inserted into the inlet pipe, and no copper wire can be exposed.

9.4 Film pressing corresponding to cable joint specifications, hydraulic wire clamp pressing, copper nose pressing 3 channels evenly, pressing trace to be evenly distributed. Pull the cable head by hand to check whether the pressure connection is reliable.

9.5 Copper burrs will appear in the indentation after the indentation. The burrs will be grinded with a file, requiring smooth hand feel.

9.6 The prepared incision is neat and the length of the heat shrinkable tube sleeve is uniform at the cable joint. The heat shrinkable tube is 5 cm longer than the copper nose inlet tube. The heat shrinkable tube is heated uniformly with a hot air gun to make it shrink evenly, bond tightly and without burning marks.

10. Cable wiring for stator and rotor of tower base converter

10.1 The cable on one side of the ground pre-fabricated cable joint will be penetrated into the conductive rail junction box. The length reserved in the junction box is moderate, and there is no tension and transition bending phenomenon.

10.2 The locking sleeve of the inlet end of the junction box of the conductive rail is completely locked.

10.3 The cables are arranged in sequence according to the phase order to clamp the cables at the clamp of the tower base cables. Require neat and beautiful cable, no cross phenomenon.

10.4 Before entering the platform cable bracket under the platform, there is a certain degree of curvature of the cable.

10.5 On the platform bracket of tower barrel, bundled according to phase sequence. Require neat and beautiful cable, no cross phenomenon.

10.6 After the cable is bundled, make sure it is firmly bundled. Make sure that the cable insulation is not damaged by the tie-up. Especially when using steel bandage, we must use rubber wrap cable and tie it!

10.7 Verify that the phase sequence of stator and rotor cables is correct and there is no phase sequence mixing problem.

10.8 The cable is drawn from the stator and rotor inlet of the frequency converter. According to the actual wiring position, the redundant cable is cut off. The cut-off surface of the cable is plane, not inclined.

10.9 Install the manufacturing method of Item 9 to make stator and rotor cable connectors at the frequency converter.

10.10 Make sure that the cable with the cable head is fixed on the transducer bracket with clips.

Tightness of Conductive Rail Junction Box Cable Joints

11.1 The installation requirements of stator and rotor cable joints in connection boxes of conductive rails at the upper and lower ends of tower drums are tightened, and the cover plate of connection boxes is installed after winding, and the bolts are tightened. Stator moment: 100Nm, rotor moment: 80Nm.

12. Cleaning in Unit

12.1 Cleaning work in the unit, especially the location of cabling and wiring. Use a vacuum cleaner to absorb the wire around the cable. Prevent metal wire from falling on the conductor rail or control cabinet to cause short circuit and damage equipment.