Introduction on Cable Accessories for 48/66~290/500kV
48/66kV~290/500kV high voltage cable accessories can be classified as porcelain bushing outdoor termination, composite bushing outdoor termination, full-prefabricated soft dry type outdoor termination, GIS termination, full-prefabricated silicone rubber straight through /insulating joint, assembled joint applied to any cross section, single-phase type and three-phase type for fully dry insulating branch joint, grounding box, and grounding protection box, interconnected box and sheath protector, etc.
4E-YJZWC Porcelain Bushing Outdoor Termination
The company produces two main of porcelain bushing outdoor termination, 4E-YJZWC3 and 4E-YJZWC4, which are widely used for outdoor high-voltage overhead lines and cable connections with anti-pollution grade of grade III, and grade IV. They are composed of connecting bar, stress cone, porcelain bushing, and tail tube. We use imported liquid silicone rubber injection molding to make stress cone, which has long-term stability of lasting hold power and electric field uniformity ability. Porcelain bushing is using high strength inorganic electric porcelain with stable performance. Porcelain bushing is applying skirt structure, and the overall is conical with good performance of pollution flashover resistance, weather resistance, anti-leakage marks, anti-erosion and water repellent ability. The porcelain is filled with insulating oil with excellent electrical insulation properties, and the mutual dissolution or penetration is as low as 1/1000 between silicon stress cone to ensure the long-term safe operation of the product. Our product is using multiple sealing structure which can effectively prevent the leakage of water immersion and insulating oil. All of the seals are using imported NBR or silicon rubber material. All of the fastener raw-material are stainless steel with good waterproof seal performance.
Porcelain bushing has a long run safe operation history more than one hundred years in the power industry, which is the best example of a mature use.
- Outlet clamp 2. Grading shield 3. Core insulation
4. Polyisobutylene 5. Porcelain bushing 6. Stress cone 7. Fixed plate 8. Support insulator 9. Tail pipe 10. Cable
|
| Size mm |
48/66kV |
64/110kV |
80/138kV |
127/220kV |
| H |
1270 |
1500 |
1750 |
2500 |
| A |
1510 |
1935 |
2085 |
3100 |
| B |
1925 |
2155 |
2400 |
3600 |
| C |
450 |
450 |
450 |
650 |
| D |
200 |
200 |
200 |
300 |
| E |
Φ22 |
Φ22 |
Φ22 |
Φ32 |
| Creepage distance |
≥2248 |
≥3906 |
≥4495 |
≥7812 |
Main structure features:
Reasonable structure: high strength inorganic electric porcelain with stable performance. Porcelain bushing is using skirt structure, the overall is conical with good anti-pollution flashover resistance, weather resistance, anti-leakage marks, anti-erosion and water repellent ability. Multiple sealing structure is perfect and effective.
1-500kV Cable Accessories Electrical Performance Parameter
1~500kV cable accessories common parameters and factory test specification
Voltage levels provided by our company include 1kV, 10kV, 35kV, 48/66kV, 56/78kV, 64/110kV, 76/132kV, 127/220kV, and 290/500kV in accordance with IEC60502, IEC60840, IEC62067, IEC60859, IEC62271-209, GB/T11017, GB/Z18890, GB/T22078, GB/T12706, GB311, GB772, BS EN 50181, IEEE386, DL508, DL509, JB/T8144 standards, and pass through rigorous factory test, type test, and pre-identification test (220kV and above).
Test name and code
Test classifications and code:
| No. |
Test Name |
Code |
| 1 |
Routine test |
R |
| 2 |
Sampling test |
S |
| 3 |
Type test |
T |
| 4 |
Pre-identification test |
P |
| 5 |
Additional test |
A |
Routine test for each of the stress cone, GIS epoxy bushing, and straight through joint prefabricate main body of 66kV and above cable accessories:
| Item |
66kV |
110kV |
220kV |
| Partial discharge |
72kV, partial discharge not more than previously carried out items |
96kV, partial discharge not more than previously carried out items |
190kV, partial discharge not more than previously carried out items |
| Power frequency withstand voltage |
120kV/30min (joint main body 60min, no flashover no breakdown) |
160kV/30min (joint main body 60min, no flashover no breakdown) |
318kV/30min (joint main body 60min, no flashover no breakdown) |
| Seal test |
0.25±0.01MPa/1h for sealing fittings, porcelain bushing, composite bushing, no leakage |
| 0.6~0.7MPa/1h for epoxy bushing, no leakage |
| Appearance test |
No damage, no cracking and other defects that affect the quality and appearance |
Product type/application range
Insulation joint: YJJJI type, straight through joint: YJJTI type
Rated voltage: 21/35kv, 26/35kv, suitable cross section: 25-800mm2
Rated voltage: 48/66kv, 56/77kv, 64/110kv, 76/132kv, suitable cross section: 185-1600sqmm
Rated voltage: 127/220kv, suitable cross section: 240-2500mm2
*Product Characteristics
The joint has an compact structure, easy to install. Long creeping distance for rubber insulation unit, suitable for the special humid area.
Outer protective shell adopts the structure of high-strength protective shell and waterproof insulation sealing. It has advantages of good mechanical protective, good sealing property and good anti-corrosion which will ensure the termination can be run safely on the bad weather condition.
Good anti-explosion property. No worry about the dangerous of fragment damage caused by accident .
To improve the waterproof property, it can provide glass fiber protection shell, pouring CL-8010 insulation paste inside.
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