1, when the wires are horizontally arranged, the distance between the center of the upper cross arm and the top of the pole should generally not be less than (200) mm
2. The exposed thread length of the tower hardware bolt should not be less than (two) pitches, and the double nuts can be flush with the nuts.
3. The cross arm is skewed up and down, and the left and right torsion shall not exceed (20) mm ..
4, check the general soil pole foundation backfill soil pole foundation backfill soil should be higher than the ground (300mm).
5. The eligibility criteria for pole cracks are: the width of pole cracks should be less than (1.0) mm; The transverse length of the pole crack should be less than (1/2) circumference; The longitudinal length of the pole crack should be less than (1.0) meters.
6, pole tilt standard straight bar is not more than (1) tip diameter; Angle bars and end bars shall not be larger than (2) tip diameters, and the club head shall not be invaded.
7. 10KV straight-line rod triangular arrangement rod top hardware installation distance is (800 )mm from the cross arm center to the rod top. The ring center of the pole top bracket is (150) mm away from the pole top.
8. 10KV tension rods are arranged in triangle, and the installation distance of rod top hardware is (950) mm from the center of cross arm to the rod top. The ring center of the pole top bracket is (150 )mm away from the pole top.
10, after the double-pole erection, the position deviation shall be no more than (30 )mm for step and no more than (30 )mm for heel. ..
1 1, and the corner pole cross arm specifies that the power line angle is (450 and below), and single cross arm or double cross arm is adopted. When the rotation angle of the power line is greater than 450, use the (second section) cross arm.
12. The bolt diameter of each part of the tower is specified as10kV; Not less than (16) mm. 0.38kV: not less than (12) mm.
13. When assembling the cross arm with U-shaped hoop, an (M-shaped) hoop should be set. When using double cross arms, the (M-type) holding iron should be adopted.
14 and 10KV self-closing lines: (2×∠75×6).
Selection of horizontal arrangement of tie rods for 10KV self-closing line: (2×∠90×8).
15. Section or diameter of stay wire: galvanized steel strand: (25)mm2；; Galvanized iron wire: (3× 4 ~ 4.0) mm; Round steel with bottom handle: (~16) mm.
16. The included angle between ordinary guy and pole is (450). Restricted by the terrain, it can be reduced appropriately, but it should not be less than (300).
17, keep a fixed position on the pole:
When the wires are arranged in a triangle, the distance between the cross arm (pictured above) and the center of the cross arm is 150-300 mm.
When the wires are arranged horizontally, the distance between the cross arm (below) and the center of the cross arm is 150-300 mm.
18, and the staying distance 10KV charged part should not be less than (200)mm；; ; The live part with a distance of 0.38KV should not be less than (100) mm.
19, the vertical distance between the horizontal brace and the center of the pavement should not be less than (6) m; The height of the railing surface should not be less than (7) meters.
20. The cross-sectional area of steel strand stay shall not be less than (70)mm2；; . The cable angle shall be (450).
The buried depth of cable tray for power lines below 2 1, 10V shall generally not be less than (1.2M).
22. The installation of the poles stipulates that the main pole and the poles should be connected with angle steel brackets, and the connection should be tight and firm. The included angle between the two poles is (300), the allowable error is (50), and the buried depth is greater than (500 mm).
23. Three-phase four-wire neutral line section: When the phase lines are LJ-50 and LGJ-50 or less, the neutral line section is equal to the phase line section;
When the phase lines are LJ-70 and LGJ-70 or above, the cross section of the zero line shall be not less than 50% of the cross section of the phase lines, but not less than 50 mm2.
The zero line of single-phase system should be equal to the cross-sectional area of phase line.
24. 10KV power line conductor spacing of various arrangements should not be less than (1M).
25, adjacent phase 10KV lead, down lead and adjacent phase lead, the gap distance between down lead and conductor is not less than (300) mm ..
26. The clear distance between the wire connector and the wire fixing place should not be less than (500) mm If there is a shockproof device, it should be outside the shockproof device.
27. The suitable length of the tension section of overhead power lines is (1-2KM).
28, cotter pin should be symmetrical opening, cotter pin opening angle should be (300-600))
29. The top groove direction of pin insulator is (along the line).
30. When parallel groove clamps are used for lead connection, the number of parallel groove clamps shall be no less than (2), the connection surface shall be smooth and level, and the connecting bolts shall be tightened one by one.
The oxide film should be removed from the conductor and groove of the parallel groove clamp and coated with conductive paste. The two parts of the fixture shall be fastened with metal wires and fastened (50) mm ..
When using double-wire clamps (insufficient leads), tie (50) mm between the double-wire clamps.
3 1, aluminum stranded wire and steel-core aluminum stranded wire should be wound with aluminum tape at the fixed place with insulators or hardware, and the winding length should exceed the contact part (30 mm). The winding direction of aluminum clad tape should be the same as that of external stranded wire.
32, different metals, different specifications, different stranded wire is strictly prohibited (cross connection).
33, wire sag error should not exceed the design sag (plus or minus 5%). The sag difference of horizontally arranged wires is not more than (50mm).
34. The initial elongation of the newly erected steel-core aluminum stranded wire is compensated by reducing the sag of the conductor, and the percentage of sag reduction is (12%).
35, sag adjustment pipe section should be suitable for (6) meteorological areas.
36. Overhead lines below10kV with span less than (25)m and no joints.
37. The distance between 10KV lines should not be less than (450) mm. ..
38, overhead line steel core aluminum stranded wire about broken strands:
Allowable range of aluminum stranded wire: (7 broken1); ( 19 off 2)； (37 off 4).
(steel core) without broken strands; No broken strands are allowed (at the intersection).
39. Only one connector is allowed for each conductor in each span, and connectors are not allowed for conductors crossing the span.
40, shear bolt under the tower, the thread shall not be located in the connection component (shear surface).
4 1. The bolt of the stressed nut should be equipped with (double nut) or single nut plus (spring washer), and the bolt near the outside of the nut should be coated with (lead oil).
42, bolt penetration direction:
1). Stereo structure
(1) Horizontal direction (from inside to outside).
(2) Vertical direction (bottom-up).
2). Aircraft structure
(1) along the line direction: double-sided components are from inside to outside, and single-sided components pass through (power transmission side to power reception side) or in a unified direction.
(2) Line crossing direction: from both sides (from inside to outside), from left to right in the middle (facing the power receiving side) or in a unified direction.
(3) Vertical direction (bottom-up).
43. Before the concrete pole is erected, the top of the pole should be (blocked). When there is no requirement in the design, the lower end may not be blocked. In cold areas, measures should be taken to prevent puddles from freezing.
44, triangle layout, cross arm, pole top bearing hoop installation distance:
The distance from the center of the pole top support hoop to the pole top is not less than (150) mm;
The distance from the center of the cross arm to the top of the pole is (500)mm；; When the plane triangle is arranged;
The distance from the center of the cross arm to the top of the pole is (800)mm；; When the cross arm is arranged in a regular triangle;
The distance between the center of tie rod cross arm and the top of tie rod is (950) mm
The distance from the center of the cross arm of the corner bar to the top of the bar is (1100) mm.
45, corner rod should be biased towards the outer corner, should not be inclined to (inner corner) after tightening the line, and the inclination of the outer corner should not make the pole tip displacement greater than (a) the pole tip; The lateral displacement of the corner bar should not be greater than 50 mm
46. The terminal board should be inclined to the side of the cable, and should not be inclined to the cable (in the opposite direction) after tightening the cable. Tilting to the pull wire side should not make the rod end shift more than (one) rod end.
47, 10KV and above power lines, the buried depth of cable tray should generally not be less than (1.2) m.
48. The cable tray should be inclined in the pit, subject to the cable pole and the upper surface of the chassis (vertical), and the connection between the cable and the cable tray should be firm and reliable.
49.( 1) When the phase lines are LJ-50 and LGJ-50 and below, the zero line section is equal to the phase line section (equal);
(2) When the phase lines are LJ-70 and LGJ-70 or above, the cross section of the zero line should not be less than (50%) of the phase line cross section, but should not be less than 50 mm2.
(3) The zero line section of single-phase system should be the same as the phase line section (same).
50. The transformer capacity installed in the substation shall generally not be greater than the following provisions:
(1) The transformer capacity of a single-pole substation should generally not be greater than (10 kva);
(2) The transformer capacity of bipolar substation should generally not be greater than (200 kva);
(3) The transformer capacity of floor-standing substation should not be greater than (300(3 15))KVA.