Rectangular yoke plates are core connectors in power fittings. Their correct installation directly affects the stability of transmission lines or substation facilities. So how should they be installed?
Component Inspection: Check if the yoke plate matches the operating requirements. Confirm that the hole spacing and thickness meet the line load requirements. Check if the zinc coating is intact, free from rust, peeling, cracks, and deformation. Ensure bolts, pins, and other fasteners are not stripped. Verify that the specifications of insulator strings, conductor clamps, and other connecting components match the hole dimensions to avoid uneven stress caused by hole diameter deviations.
Installation: The contact surfaces of the yoke plate with the insulator fittings and conductor clamps must be completely flush, without gaps or misalignment. Forced splicing is prohibited. The bolt or pin direction must be consistent to ensure the force direction is aligned with the yoke plate's design load direction, avoiding stress concentration caused by reverse installation. Apply torque according to the drawings. After tightening the bolts, use anti-loosening washers to lock them in place.
Acceptance: Observe that the fasteners are not loose, and the yoke plate is free from deformation and scratches. Use an insulation megohmmeter to test the insulation performance of the connection points to avoid the risk of grounding short circuits.
Besides installation, routine maintenance of Rectangular Yoke Plates is crucial. In addition to visual inspection, regular anti-corrosion treatment is necessary, as the zinc coating may be damaged during use. We first sand away any rust, then apply cold-dip galvanized paint with a thickness ≥80μm. If the yoke plate is found to be severely damaged, it must be replaced. For yoke plates that have been used for 3 years, sampling inspection should be conducted to check for internal cracks or fatigue damage. If a decrease in tensile strength >10% is found, batch replacement is required. After a natural disaster, a comprehensive inspection of the yoke plate connections is necessary, focusing on deformation caused by internal or external impacts, loose bolts, or cracks at the insulator-yoke connection.
Rectangular yoke plates are core connectors in power systems, and their quality directly impacts the safety of transmission lines. Therefore, quality control during the production process is crucial, ensuring that users can purchase high-quality products from the very beginning:
Raw Material Monitoring:The chemical composition and mechanical properties of raw materials must meet user requirements. Non-standard or inferior steel must be avoided. Surface defects such as cracks, folds, scars, and rust must be absent, and thickness deviation must be ≤ ±0.5mm.
Processing Monitoring:Ensure the yoke plate's length and width deviations are ≤ ±0.2mm, diagonal deviations are ≤ ±0.3mm, edges are free of burrs and flash, and the perpendicularity deviation of the cut surface is ≤ 0.5°. Prevent stress concentration or poor installation fit. Defective yoke plates must be reworked promptly.
Hole Position Accuracy Monitoring:Accuracy must be ≤ ±0.1mm, hole diameter deviation ≤ ±0.1mm, and hole spacing deviation ≤ ±0.2mm.
Surface Treatment Monitoring:Zinc bath temperature... The immersion temperature is 440-460℃, and the zinc immersion time is adjusted according to the plate thickness. The zinc coating is uniform and smooth, without defects such as exposed iron, drips, or lumps. Finished product quality control: After the production of Rectangular Yoke Plates is completed, finished product quality inspection is carried out. The inspection includes many aspects, including dimensional inspection, mechanical property testing, and appearance and packaging inspection, to ensure that it meets the user's requirements.
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