1 scope
This technology is applicable to general
industrial and civil building electrical installation engineering 10 (6) kV
indoor Terminal head paper insulated cables.
2 construction preparation
2.1 devices and materials requirements:
2.1.1 cable terminal use styling products,
and the connection should be closed tight, attachment is complete, and has a
factory certificate (table 2-2, table 2-3).
2.1.2 insulation adhesives and epoxy glue
should be stereotyped products, must conform to the voltage level and the
design requirements, product certification, insulated physicochemical and
electrical properties of single.
2.1.3 fixed cable head metal fasteners are
galvanized, and complete the appropriate nuts, washers and spring washers.
2.2 the main tools:
2.2.1 production machinery: wiring pliers,
blowtorches, hacksaws, hydraulic plastic sheets, iron pots, plates, aluminum
pots, aluminum aluminum pot, spoon, slotted spoon, funnel, scissors, disposable
gloves, steel tape, electric stove, etc.
2.2.1 Installing machines: drilling
machine, electric welding machine, electric hammer, wrench, tape, etc.
2.2.3 testing tool: shake table, steel
ruler, thermometer, test equipment and so on.
2.3 operating conditions:
2.3.1 cable terminal making should choose a
sunny windless days making, its ambient temperature above + 5 ℃, relative
humidity is above 70%.
2.3.2 construction site and its
surroundings should be clean and dry.
2.3.3 finished basic civil engineering
construction, slurry walls, the roof, and related electrical equipment has been
installed, the construction site should meet the prescribed safety, fire,
flammable for safe keeping.
2.3.4 with 220V power supply at
construction site and safe power supply.
2.3.5 cable terminal making should be borne
by the specially trained qualified personnel.
3 operational processes
3.1 process:
Equipment check point → shake test
calibration moisture → stripped cable of cable insulation and protective layers and
welding of steel → line →
Stripped of lead sheet into oil hose → → → → terminal end Cable
Assembly cable wiring nose Terminal →
Perfusion grounding cable compound → check →
commissioning and acceptance
3.2 cable terminal making made according to
the following procedure. Strip cut from the beginning to the completed, must be
carried out continuously, at once so as not to damp.
3.3 equipment inspections:
3.3.1 box check: construction units,
delivery units or units for inspection, and make a record.
3.3.2 cable terminal boxes shall be
conducted according to technical data or manuals, accessories complete and
without damage.
3.3.3 cable terminal box models must meet
the design requirements, the accessories match, as shown in table 2-4, table
2-5.
3.4 roll cable insulation measurement and
calibration of moisture:
3.4.1 the cable head turn, 2500V side table
side insulation resistance measurement, after passing tide.
3.4.2 connection end saw 100mm about long
cables, turnkey and tear off a few of the core paper insulated, cable oils into
140~150℃ (no cable oil can substitute transformer oil Rosin, hereinafter the
same), such as moisture, oil will be suffused with bubbles and make a hissing
sound, cable fuel heating, heating mode as shown in Figure 2-13.
3.4.3 another boom is burning method: paper
torn off, fire, moisture, insulation paper surface will bubble up and making a
hissing sound.
School boom to complete, such as when he
found the cable insulation with moisture, piecewise removal, tide, until no
moisture is obtained.
3.5 remove cable cover:
According to the cable terminal fixation to
the distance between the connected devices decides to strip cut size and the
length of the line (as shown in Figure 2-14 and tails should be able to meet
the requirements of Exchange phase).
3.5.1 according to size, peel off jacket
(or plastic).
3.5.2 from sheathed fracture to the end of
the 100mm clamp or ground wires and strips are secured with 2mm bare copper
wire (clamp two-thirds wide steel strip processing), welded steel, Kazi, bare
copper wire at the ground prior to Polish, gloss, so that the welding ground.
And strip steel. When Peel strips, use a hacksaw saw a ring of dark marks, its
depth shall not exceed one-second of the steel strip thickness (never saw so as
not to damage the lead), then pry the Strip with a screwdriver tip, combination
pliers are clamped tear Strip.
3.6 welding ground:
3.6.1 will lead clean, copper and plastic
lines or braided copper wire (less than 16 mm2 cable for 120mm2 cable, more
than 150 mm2 cable with 25 mm2) in the lead Pack and strip with φ 2 turns of
copper wire tied to 3~5.
3.6.2 with torches lead ground lead and
steel strip welded on in prison. Require welding on two layers of steel with
smooth surface, no stitch welding.
3.7 stripping lead and lead expansion:
3.7.1 the use shredded cotton wipe dipped
in gasoline lead Pack, clean inside the cable housing into the cable.
3.7.2 stripping lead. Volume 150mm lead
pack at the steel fracture, the rest of the Strip. Stripping lead Shi should
note with electrical knife carved a ring deep marks, its depth shall not over
lead package thickness of one-second (stripping lead Qian first Pu good rubber
cloth or plastic sheeting), with electrical knife from ring marks at to end
designated two road parallel deep marks, its depth for the lead package
thickness of one-second, two line distance about 10MM, then from end will lead
article tore to, Hou removed lead package (Figure 2-15).
3.7.3 lead expansion: expanding lead with
expanded lead, Shun turnkey paper winding direction 30 ° ~45 ° angle with the
expanded lead, will lead expansion into a 45 ° angle to form Bell, lead to
smooth, symmetrical, Burr (Figure 2-16).
3.7.4 stripping except Commission package
paper: first stripping to outer semiconductor paper, then in expansion lead
mouth 25mm at package wrapped around 5 layer black paint across with, and
filled expansion lead trumpet last a layer package had expansion lead trumpet,
from cable end with hand tore off Commission package paper, with electrical
knife cut to filler (must note knife direction should makes knife sliding off
Shi not injury cable insulation).
3.7.5 broken core wires, one hand firmly
holding the core velvet roots, one hand and gently pull the wire to break
apart, not too hard, so as not to damage wire insulation paper (Figure 2-17).
3.8 wrapping cable insulation and jacket
into the oil hose:
Each core on the chromatography paper use
hands torn off, hand pulled cotton yarn stained with alcohol wipe wire cable on
the oil, then paper-wound direction half overlapping wrap two layers of black
paint across the belt. According to the length of the cable line into the oil
hose until the three-core separate from three separate core 50mm, each of the
same 200mm using half overlap wrapped six layers of black paint across the zone.
3.9 connecting nose:
3.9.1 stripping except from cable core line
end volume take wiring Terminal hole of length added 10MM of insulation paper,
will line core line and line nose with cotton dip gasoline wipe NET, pressure
wiring nose, put line nose polished smooth clean, smear a layer had chlorine
vinyl paint, package wrapped around plastic with, has been package wrapped
around to and core line insulation phase flat weizhi, each layer plastic with
Zhijian are smear had chlorine vinyl paint.
3.10 assembled cable terminal (Figure
2-18):
3.10.1 put nylon cable head of Xia sealed
pieces twist tight, loaded good Shang cover, again sets Shang rubber finger
sets, finger sets upper and lower ends package wrapped around two layer plastic
with (are must smear had chlorine vinyl paint), then with nylon small line
lashing firm, lashing length not is less than 20mm (first lashing II phase,
left pouring insulation rubber convenient of a root, note rubber finished Hou
again lashing).
3.10.2 oil hose diameter on perchlorovinyl
paint, back into line on the nose 40mm, wrap two layers of plastic, tied
tightly with a small nylon line, tied the length not less than 20mm.
3.10.3 from rubber finger COTS to the half
full length nose with black paint across the line overlap wrapping two layers.
3.11 fixed cable terminal. Nylon cable
clamp installed, the cable head is fixed firmly, from the fief line 50mm
installation cable support cable vertical 1500mm there should be two mounting
brackets.
3.12 perfusion cable compound. Previously
heated to 170~180 ° cable compound, not a rubber finger bandage from the reserved
entrance into the cable head, once filled, cooled 60 ℃, to fix
water, then wrapped the rest in the same way a finger.
3.13 properly earthed, check the phase,
with yellow, green, red, plastic bag wrapped in wire preparation, cable ends
clean.
3.14 commissioning and acceptance:
3.14.1 the first cable production has been
completed, as required by the test Department pressure and test.
3.14.2 acceptance: the no-load run 24h no
abnormal phenomenon, for the acceptance procedures unit. Submit change of
negotiation, product certification, specification, test reports, and running
records and other technical information.
4 quality criteria
4.1 project:
4.1.1 cable terminal pressure results, the
leakage current and insulation resistance code requirements must be met.
4.1.2 cable terminal closed tight, packing
infusion full, no bubbles, oil leakage, wire connections tight.
Inspection method: Visual check and
inspection and test records.
4.2 Basic project:
Cable head good looks, smooth, with no sand
hole, wire bending wave-free.
Inspection method: Visual check.
5 finished product protection
5.1 in the process of making a cable head,
less wearing parts with care, materials tools clean, so as not to affect
production quality.
5.2 filling when insulated, not allowed to
touch the cable head parts.
5.3 the first cable production after the
immediate fixing, transmission runs, transmission or cannot have other jobs,
giving protection to cable head and wooden boxes to prevent smashing, touch.
6 quality problems to be noticed
6.1 cable insulating paper cannot be
damaged, particularly in three separate core broke off when to be extra
cautious, not too hard. In wrapping the insulation layer, not to pretend to
wire back and forth.
6.2 in the making in cable head, materials,
tools and equipment shall be kept clean and free of moisture, wipe the moisture
in the hands of.
6.3 lead to fast, bake-lead package, flames
should be uniform to avoid damaging the lead Pack and reduce the dielectric
strength.
Quality of 7 records
7.1 product certificate.
7.2 equipment inspection records.
7.3 cable test report form.
7.4 compound chemical and electrical
performance test report form.
7.5 mutual inspection records.
7.6 change record of negotiation.
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