Wiring process of ship generator power cable

Abstract

The invention relates to the technical field of ship generator wiring, and discloses a ship generator power cable wiring process, which comprises the following steps: S1, threading, S2, stripping a wire sleeve, stripping an outer sheath and an inner sheath of a cable wiring end, and sleeving the root of each cable with a black polymer insulating flame-retardant thermal shrinkage thick-wall sleeve with a proper specification; and S3, determining the trend of the cable core wire, and arranging the trend of each phase of core wire in a layered manner according to the arrangement of the binding post. A section of color-separation heat-shrinkable sleeve is adopted at the wiring end of the cable core wire, namely the position close to a copper joint, to distinguish and identify U, V and W three-phase power supplies, the construction is convenient and fast, the quality is reliable, and for a generator with a relatively large internal space of a wiring box, the cost is low. And three-phase core wires are required to be completely separated and bound and fixed, so that the reliability of power supply is further improved, and the wiring quality of the engine cable is improved while the construction efficiency is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of ship generator wiring, in particular to a wiring process for a ship generator power cable. Background Art

[0002] At present, the insulation material of marine power cables mainly adopts cross-linked polyethylene, which has good insulation properties, but is not resistant to high temperatures and abrasion. The ship generator vibrates greatly during operation. The power cable connected to the generator junction box has limited wiring space, so the core wires will inevitably touch and rub. Over time, the cable core wires rub against each other due to the vibration of the generator, and the insulation layer of the core wire melts and deforms at local high temperatures, eventually forming a short circuit, resulting in a large quality loss.

[0003] The traditional method of protecting the core wire is to wrap PVC insulating tape around the cable core wire. However, wrapping PVC insulating tape usually needs to be done manually, which is not only time-consuming but also inefficient. PVC insulating tape may be difficult to perfectly fit the complex shapes or joints on the cable core wire, especially when the cable needs to be bent. At the bend, the tape may not provide sufficient protection and may even fall off during the bending process.

[0004] Moreover, in narrow spaces such as ship generator junction boxes, construction workers have very limited operating space, and winding PVC insulating tape requires a certain range of movement to ensure that the tape can be evenly wound around the cable, making it difficult to ensure the continuity and tightness of the tape. Summary of the invention

[0005] The object of the present invention is to provide a wiring process for a ship generator power cable to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a wiring process for a ship generator power cable, comprising the following steps: S1: Threading: thread the cables of the generator into the cable stuffing box in sequence, leaving enough bending radius and wiring length; S2: Strip the outer and inner sheaths of the cable terminals, and put a black polymer insulation flame-retardant heat-shrinkable thick-walled sheath of appropriate specifications on the root of each cable; S3: Determine the direction of the cable core wires and arrange the direction of each phase core wire in layers according to the layout of the terminal posts; S4: Trim the cable and cut the cable at a suitable length using wire cutters according to the confirmed core wire direction, leaving enough space for installation; S5: Strip the insulation layer and install the copper connector. Strip the insulation layer of the core wire end according to the length required for the copper connector crimping, install the copper connector and press it tightly with the crimping pliers. S6: Secondary casing, measure the length of a group of cable cores inside the junction box, cut a suitable length of black polymer insulation flame retardant heat shrink thick wall casing and put it on each core; S7: Hot air drying: use a hot dryer to dry the heat shrink tubing pre-covered on the core wire to shrink and fit the cable core wire, and then dry the heat shrink tubing pre-covered on the cable root to shrink and fit the cable; S8: Put on color-coded heat shrink sleeves. Put on color-coded insulating flame-retardant heat shrink sleeves on the copper joints of each cable core wire. The color of the sleeve should be the same as the color of the core wire, and use a heat dryer to shrink it and attach it to the base of the copper joint and the core wire; S9: Wiring: Use wiring bolts to connect the copper connectors of the cable group (U / V / W) to the corresponding busbars; S10: Repeat the wiring, and repeat the above steps S3-S10 for each set of cables; S11: Arrange the cables. After all the cable cores are connected, arrange the cores so that each row of cores is separated and evenly spaced. S12: Use flame-retardant nylon cable ties to securely tie the cable cores to the insulating cross brace in front of the busbar.

[0007] Preferably, in S2, after stripping off the outer sheath of the cable, if the cable has a shielding layer, first strip off a portion of the shielding layer, and electrically connect the portion of the shielding layer to the grounding component in the stuffing box.

[0008] Preferably, after the shielding layer and the stuffing box are connected in S2, the stuffing box is tightened to ensure sealing.

[0009] Preferably, in S2, the length of the black polymer insulation flame retardant heat shrinkable thick wall casing is controlled between 90-120 mm.

[0010] Preferably, in S3, when arranging the directions of the core wires of each phase, the core wires of the three-phase cable must be completely separated without being squeezed or entangled.

[0011] Preferably, in S4, the cable length is trimmed and cut, and the excess is based on the core wire being able to be securely tied to the insulating cross brace and just reaching the wiring bolt after the copper joint is installed.

[0012] Preferably, in S7, when the hot air is blown, it is blown from the middle of the heat shrink tubing toward both ends.

[0013] Preferably, in S8, the length of the color-separated insulating flame-retardant heat shrink sleeve is controlled between 90-100 mm.

[0014] Preferably, in S9, when connecting the copper joint to the busbar using the terminal bolts, use an adjustable torque wrench to tighten the nuts to the specified torque and mark them.

[0015] Preferably, in S12, when bundling and fixing, when there are edges and corners on the insulating cross brace, a rubber pad is added between the cable and the insulating cross brace.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses a thick-walled heat shrink tubing made of modern polymer materials to cover the cable core wire to increase the wear resistance, heat resistance and fire resistance of the core wire insulation. In addition, a color-separated heat shrink tubing is used at the wiring end of the cable core wire, that is, near the copper joint to distinguish and identify the U, V, W three-phase power supply. The construction is convenient and the quality is reliable. For generators with a large internal space of the junction box, the three-phase core wires are required to be completely separated and tied and fixed, which further increases the reliability of power supply, ensures construction efficiency, and improves the wiring quality of the engine cable. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] Embodiment 1: The present invention provides a technical solution: a wiring process for a ship generator power cable, comprising the following steps: S1: Threading: thread the cables of the generator into the cable stuffing box in sequence, leaving enough bending radius and wiring length; ensure that the cables are correctly introduced into the generator junction box, ensure the fixation and sealing of the cables, avoid excessive bending of the cables, reduce mechanical damage to the cables, and leave enough wiring length to facilitate subsequent cable connection and maintenance; S2: Strip the outer and inner sheaths of the cable terminals, and put on a black polymer insulation flame-retardant heat-shrinkable thick-walled casing of appropriate specifications at the root of each cable to prepare the cable terminals for the subsequent installation of copper joints. By putting on the heat-shrinkable casing, additional insulation protection is provided for the cables, and the mechanical strength and waterproof performance of the cable joints are improved; S3: Determine the direction of the cable core wires, and arrange the direction of each phase core wire in layers according to the layout of the terminal; optimize the layout of the cables, ensure the isolation between cables, reduce interference, facilitate the installation and maintenance of cables, improve work efficiency, reduce the crossing and confusion between cables, and improve the overall aesthetics of the electrical system; S4: Trim and cut the cable. Use wire cutters to cut the cable at a suitable length according to the confirmed core wire direction, leaving enough space for installation. Ensure that the cable length is appropriate, neither too long nor too short, so that it is easy to manage and install, avoid space waste and safety hazards caused by redundant cables, and provide accurate dimensions for the next step of installing copper joints and heat shrink tubing. S5: Strip the insulation layer and install the copper connector. Strip the insulation layer of the core wire end according to the length required for the copper connector crimping, install the copper connector and press it tightly with a crimping pliers; prepare the core wire end to ensure good contact between the copper connector and the core wire, and realize the electrical connection between the core wire and the busbar through the copper connector to improve the reliability and conductivity of the connection; S6: Secondary casing, measure the length of a group of cable cores inside the junction box, cut a suitable length of black polymer insulation flame-retardant heat-shrinkable thick-wall casing and put it on each core; enhance the insulation performance of the cable core, reduce the occurrence of electrical faults, prepare for subsequent heat shrinking operations, and ensure that the heat shrink casing can shrink smoothly; S7: Hot air drying: Use a hot air drying machine to dry the heat shrink tubing pre-covered on the core wire to shrink and fit the cable core wire, and then dry the heat shrink tubing pre-covered on the cable root to shrink and fit the cable; make the heat shrink tubing fit tightly on the cable core wire, improve insulation and waterproof performance, protect the copper joint from external environment, improve connection reliability, and ensure mechanical strength and electrical performance of the cable joint area; S8: Apply color-coded heat shrink sleeves. Apply color-coded insulating flame-retardant heat shrink sleeves on the copper joints of each cable core. The color of the sleeve should be the same as the color of the core wire, and use a heat dryer to shrink it and attach it to the base of the copper joint and the core wire. Different phase wires are distinguished by color, which is easy to identify and maintain, provides additional insulation protection, enhances the safety of the electrical system, and is beautiful, neat, and easy to identify. S9: Wiring: Use wiring bolts to connect the copper connectors of the cable group (U / V / W) to the corresponding busbars; achieve electrical connection between the cable and the generator, ensure the stability and conductivity of the connection, reduce the risk of electrical failure, and facilitate subsequent testing and debugging; S10: Repeat the wiring, and repeat the above steps S3-S10 for each set of cables; ensure the consistency and reliability of all cable sets, ensure the quality and safety of electrical connections, and improve the stability and reliability of the overall electrical system; S11: Arrangement: After all the cable cores are connected, arrange the cores so that each row of cores is separated and evenly spaced; optimize the layout of the cables to facilitate management and maintenance, reduce the crossing and confusion between cables, improve the overall aesthetics of the electrical system, reduce the difficulty of future maintenance, and improve work efficiency; S12: Fixed bundling: Use flame-retardant nylon cable ties to tie the cable cores to the insulating cross brace in front of the busbar. Keep the cables neat and orderly to reduce the impact of vibration. Protect the cables from mechanical damage and extend their service life. Improve the overall safety of the electrical system.

[0019] In S2, after stripping the outer sheath of the cable, if the cable has a shielding layer, first strip off a portion of the shielding layer and electrically connect this portion of the shielding layer to the grounding component in the stuffing box. Electrically connecting the shielding layer to the grounding component in the stuffing box can effectively shield electromagnetic interference and protect the signal or power transmission in the cable from interference. After making a good connection between the shielding layer and the stuffing box, tighten the stuffing box to ensure sealing.

[0020] In S2, the length of the black polymer insulation flame-retardant heat shrink thick-walled tubing is controlled between 90-120mm. This is to ensure that the cable joint area is fully protected, while also taking into account the installation convenience and economy of the heat shrink tubing.

[0021] In S3, when arranging the direction of each phase core wire, the three-phase cable core wires must be completely separated without extrusion and entanglement. According to the arrangement of the terminal, the direction of each phase core wire should be reasonably planned. Ensure that the three-phase cable core wires are completely separated without mutual extrusion and entanglement. Arrange the cable core wires in layers to ensure isolation between phases. By completely separating the three-phase cable core wires, electromagnetic interference between phases can be reduced, the stability of the electrical system can be improved, and avoiding extrusion and entanglement between cable core wires can reduce the risk of short circuit and improve the safety of the electrical system. Reasonable core wire direction can make the cables arranged in order, and limited space can be used more effectively, which is convenient for subsequent inspection and maintenance.

[0022] In S4, the cable length is trimmed and the excess is based on the core wire being able to be securely tied to the insulating cross brace and just reaching the connection bolt after the copper joint is installed.

[0023] In S7, when the hot air is blown, start from the middle of the heat shrink tubing and blow toward both ends. Blowing from the middle of the heat shrink tubing toward both ends can help the heat shrink tubing shrink more evenly and avoid bubbles or non-bonding caused by uneven local shrinkage.

[0024] In S8, the length of the color-separated insulation flame-retardant heat shrink sleeve is controlled between 90-100mm. This is to ensure that the cable joint area is fully protected, while also taking into account the installation convenience and economy of the heat shrink sleeve.

[0025] In S9, when connecting the copper joint to the busbar using the terminal bolts, use an adjustable torque wrench to tighten the nuts to the specified torque and mark them.

[0026] In S12, when bundling and fixing, when there are edges and corners on the insulating cross brace, rubber pads are added between the cable and the insulating cross brace. Adding rubber pads between the cable and the insulating cross brace can effectively reduce the wear of the cable when it contacts the edges and corners, protect the outer sheath of the cable from damage, and the rubber pads can absorb part of the vibration energy, reduce the additional stress of the cable caused by the vibration of the generator, and extend the service life of the cable. By reducing the wear of the cable, the risk of electrical faults such as short circuits is reduced, and the overall safety of the electrical system is improved.

[0027] The present invention uses a thick-walled heat shrink tubing made of modern polymer materials to cover the cable core wire to increase the wear resistance, heat resistance and fire resistance of the core wire insulation. In addition, a color-separated heat shrink tubing is used at the wiring end of the cable core wire, that is, near the copper joint to distinguish and identify the U, V, W three-phase power supply. The construction is convenient and the quality is reliable. For generators with a large internal space of the junction box, the three-phase core wires are required to be completely separated and tied and fixed, which further increases the reliability of power supply, ensures construction efficiency, and improves the wiring quality of the engine cable.

[0028] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A wiring process for a ship generator power cable, characterized in that: The following steps are involved: S1: Threading: thread the cables of the generator into the cable stuffing box in sequence, leaving enough bending radius and wiring length; S2: Strip the outer and inner sheaths of the cable terminals, and put a black polymer insulation flame-retardant heat-shrinkable thick-walled sheath of appropriate specifications on the root of each cable; S3: Determine the direction of the cable core wires and arrange the direction of each phase core wire in layers according to the layout of the terminal posts; S4: Trim the cable and cut the cable at a suitable length using wire cutters according to the confirmed core wire direction, leaving enough space for installation; S5: Strip the insulation layer and install the copper connector. Strip the insulation layer of the core wire end according to the length required for the copper connector crimping, install the copper connector and press it tightly with the crimping pliers. S6: Secondary casing, measure the length of a group of cable cores inside the junction box, cut a suitable length of black polymer insulation flame retardant heat shrink thick wall casing and put it on each core; S7: Hot air drying: use a hot dryer to dry the heat shrink tubing pre-covered on the core wire to shrink and fit the cable core wire, and then dry the heat shrink tubing pre-covered on the cable root to shrink and fit the cable; S8: Put on color-coded heat shrink sleeves. Put on color-coded insulating flame-retardant heat shrink sleeves on the copper joints of each cable core wire. The color of the sleeve should be the same as the color of the core wire, and use a heat dryer to shrink it and attach it to the base of the copper joint and the core wire; S9: Wiring: Use wiring bolts to connect the copper connectors of the cable group (U / V / W) to the corresponding busbars; S10: Repeat the wiring, and repeat the above steps S3-S10 for each set of cables; S11: Arrange the cables. After all the cable cores are connected, arrange the cores so that each row of cores is separated and evenly spaced. S12: Use flame-retardant nylon cable ties to securely tie the cable cores to the insulating cross brace in front of the busbar.

2. The wiring process of a ship generator power cable according to claim 1, characterized in that: In S2, after stripping off the outer sheath of the cable, if the cable has a shielding layer, first strip off a portion of the shielding layer, and electrically connect this portion of the shielding layer to the grounding component in the stuffing box.

3. The wiring process of a ship generator power cable according to claim 2, characterized in that: After the shielding layer and the stuffing box are connected in S2, tighten the stuffing box to ensure sealing.

4. The wiring process of a ship generator power cable according to claim 1, characterized in that: In S2, the length of the black polymer insulation flame retardant heat shrinkable thick wall tubing is controlled between 90-120mm.

5. The wiring process of a ship generator power cable according to claim 1, characterized in that: In S3, when arranging the direction of each phase core wire, the three-phase cable core wires must be completely separated without squeezing or entanglement.

6. The wiring process of a ship generator power cable according to claim 1, characterized in that: In S4, the cable length is trimmed and the excess is based on the core wire being able to be securely tied to the insulating cross brace and just reaching the connection bolt after the copper joint is installed.

7. The wiring process of a ship generator power cable according to claim 1, characterized in that: In S7, when the hot air is blown red, it starts from the middle of the heat shrink tubing and blows toward both ends.

8. The wiring process of a ship generator power cable according to claim 1, characterized in that: In S8, the length of the color-separated insulating flame-retardant heat shrink sleeve is controlled between 90-100 mm.

9. The wiring process of a ship generator power cable according to claim 1, characterized in that: In S9, when connecting the copper joint to the busbar using the terminal bolts, use an adjustable torque wrench to tighten the nuts to the specified torque and mark them.

10. The wiring process of a ship generator power cable according to claim 1, characterized in that: In S12, when bundling and fixing, if there are edges and corners on the insulating cross brace, a rubber pad is added between the cable and the insulating cross brace.