Our Exquisite Product Portfolio
1. Comprehensive Scope
These superior cables are meticulously manufactured and rigorously tested in strict accordance with IEC60502 standards. Innovatively designed Power Cables featuring Extruded Insulation and their versatile accessories cater to rated voltages from 1kV(Um1.2 kV) up to an impressive 30kV(Um 36kV).Moreover, Greatwall Cable offers an extensive range of XLPE insulation cables that comply with esteemed national and international standards or can be tailoredto specific custom specifications.
2. Construction and Material Excellence
1) Precision in Conductor Construction
The conductors are expertly crafted to be typically class 2, featuring compacted circular or circular standard conductors, made from copper or aluminium for optimal performance.
2) State-of-the-Art Conductor Screen
All cables with rated voltages exceeding 1.8/3kV are equipped with advanced conductor screening, which is non-metallic and comprises either state-of-the-art semi-conducting tape or a sophisticated layer of extruded semi-conducting compound, or an innovative combination of both.
3) Premium Quality Insulation
Insulation is expertly crafted, consisting of a finely extruded cross-linked polyethylene (XLPE)layer that ensures optimal protection and durability.
4) Advanced Insulation Screen
For cables at rated voltages exceeding 1.8/3kV , the insulation screening is composed of a non-metallic semi-conducting part combined with a metallic layer. It includes either high-grade semi-conducting tape or a sophisticated layer of extruded semi-conducting compound. The extruded insulation screen is usually of the easy-to-remove type but can be supplied with a bonded version on request.
The metallic component is typically applied to individual cores for cables rated above 1.8/3kV and surrounds the core assembly for cables rated at 1.8/3kV and includes plain annealed copper tape. Upon request, an additional layer such as a copper tape screen, copper wire, a lead alloy, or a corrugated aluminum sheath can be incorporated.
5) Inner Covering or Separation Sheath (for armored cables)
Beneath the armor, where no screen exists, a PVC inner covering is applied meticulously.
In cases where metallic screening is needed and where the armor consists of different metals, an expertly extruded PVC separation sheath is used to ensure complete separation of the distinct metals.
6) Robust Metallic Armor
For those moments when added durability and protection are paramount, our cables can be equipped with an armor of unmatched quality. If required, choose between a robust single layer of round wires or double tapes crafted from galvanized steel, aluminum, or other non-magnetic metals. Particularly for single-core cables on A.C circuits, non-magnetic armor, typically aluminum, is indispensable for optimal performance.
7) Outer Sheath
Every cable comes standard with an expertly extruded black PVC outer sheath, conforming to class ST2 specifications. However, should your needs demand, we offer a spectrum of alternatives like PE (polyethylene), and high flame or fire retardant PVC, amongst others, ensuring your project's success in any scenario.
8) Core Identification
Our multi-conductor cables are meticulously identified as per the stringent IEC60502 standards, guaranteeing top-notch quality and reliability.
3.Typical Drawing
4. Technical Parameter
Nominal Cross Sectional area of Conductor
mm2 |
Max.D.C. resistance of conductor at 20°C |
|
| |
copper |
aluminum |
| 1 |
18.1 |
|
| 1.5 |
12.1 |
|
| 2.5 |
7.41 |
|
| 4 |
4.61 |
|
| 6 |
3.08 |
|
| 10 |
1.83 |
3.08 |
| 16 |
1.15 |
1.91 |
| 25 |
0.727 |
1.20 |
| 35 |
0.524 |
0.868 |
| 50 |
0.387 |
0.641 |
| 70 |
0.268 |
0.443 |
| 95 |
0.193 |
0.320 |
| 120 |
0.153 |
0.253 |
| 150 |
0.124 |
0.206 |
| 185 |
0.0991 |
0.164 |
| 240 |
0.0754 |
0.125 |
| 300 |
0.0601 |
0.100 |
| 400 |
0.0470 |
0.0778 |
| 500 |
0.0366 |
0.0605 |
| 630 |
0.0283 |
0.0469 |
| 800 |
0.0221 |
0.0367 |
| Power frequency A.C. voltage test |
Test voltage 3.5kV/5min |
Current carrying rating factors for ambient air temperature
| Ambient air temperature |
20°C |
25°C |
30°C |
35°C |
40°C |
45°C |
| Rating factor |
1.23 |
1.17 |
1.12 |
1.06 |
1.00 |
0.94 |
Current carrying rating factors for different soil temperature:
| Soil temperature |
20°C |
25°C |
30°C |
35°C |
40°C |
| Rating factor |
1.04 |
1.0 |
0.96 |
0.92 |
0.87 |
5. Tests
Our finished cables are rigorously tested to meet and exceed all relevant requirements as outlined in IEC60502, ensuring impeccable performance and durability.
| Items |
Test Requirements |
Routine test |
1.Resistance of conductors |
Reference page 12 |
| 2.Partial discharge test |
3.6/6(7.2)KV-18/30(36)KV: Not more than 20pC at 1.5Uo |
| 3.Power frequency voltage test |
0.6/1KV-3.6/6(7.2)KV: (2.5Uo+2)KV/5min
6/10(12)KV-18/30(36)KV: (2.5Uo)KV/5min |
Special test |
1.Conductor examination |
|
|
| 2.Check of dimension |
|
|
| 3. Voltage test for 4h |
6/10(12)KV-18/30(36)KV: 3UoKV/4h |
4. Hot set test |
Item |
Requirements |
| Temperature (±3°C) |
200 |
| Time under load(Min.) |
15 |
| Stress (N/cm2) |
20 |
| Max. elongation under load (%) |
175 |
| Max. permanent elongation after cooling (%) |
15 |
Type test |
1.Partial discharge test |
3.6/6(7.2)KV-18/30(36)KV: Not more than 20pC at 1.5Uo |
| 2.Heating cycle test |
3.6/6(7.2)KV-18/30(36)KV
Conductor temperature: 100°C
3 times (On 2h+Off 4h) |
3.Impulse withstand test |
Rated voltage
(kV) |
3.6/6(7.2) |
6/10(12) |
8.7/15(17.5) |
12/20(24) |
18/30(36) |
Test voltage
(kV) |
60 |
75 |
95 |
125 |
170 |
Each ±10 shots at 95°C
A.C. voltage test after impulse withstand test
3.6/6(7.2)KV: (2.5Uo+2)KV/15min.
6/10(12)KV-18/30(36)KV: (2.5Uo)KV/15min. |
| 4.High-voltage test for 4h |
3.6/6(7.2)KV-18/30(36)KV: 3UoKV/4h |
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FAQ
Q1: How can I get the price?
We pride ourselves on our swift response, typically providing a comprehensive quote within 24 hours of receiving your inquiry, barring weekends and holidays. If you need our pricing more urgently, please don't hesitate to email us or use other communication methods for expedited service.
Q2: Can I get samples?
We are thrilled to offer samples at no cost, with only express shipping fees applicable. If you have a courier account, you're welcome to arrange for collection, ensuring you experience our product quality first-hand swiftly.
Q3: If we place an order, when will it be delivered?
Delivery timelines are contingent on order size. Typically, smaller orders are dispatched within 3-5 working days. For larger quantities, we will provide a precise timeline upon receipt of your formal order to ensure transparency and reliability.
Q4: How do you make our business long-term and good relationship?
Our commitment to excellence is unwavering-offering unparalleled quality and competitive pricing to enhance the success of our partners. We cherish every customer, valuing their trust and fostering friendships through genuine business practices, irrespective of their origin.
Q5: Do you accept OEM/ODM?
Absolutely, we embrace OEM/ODM collaborations. Share your vision with us, and we'll bring it to life with precision.
We welcome your inquiries with open arms. Kindly leave your request, and expect a detailed response within 24 hours.
Range of Business
Comprehensive Range of Cables:
Low Voltage Power Cables: Offering 0.6/1kV and Below, Our PVC or XLPE Insulated Power Cables Provide Robust and Dependable Solutions.
Medium Voltage Power Cables: Engineered for 6-35kV, Our XLPE Insulated Power Cables Ensure Superior Performance and Reliability.
High Voltage (Extra-high Voltage) Power Cables: For 66-500kV, Our XLPE Insulated Power Cables Deliver Exceptional Strength and Efficiency.
Bare Conductors and Electrical Wires: Crafted for Excellence in Conduction and Reliability.
Innovative Cable Accessories:
1~35kV Cold Shrinkable Products: Cutting-edge Solutions for Seamless Cable Terminations
a. Indoor Termination: Designed for Secure and Efficient Indoor Connections.
b. Outdoor Termination: Engineered to Withstand External Conditions and Provide Reliable Outdoor Connectivity.
c. Straight Through Joint: Ensures Smooth and Continuous Electrical Pathways.
1~35kV Heat Shrinkable Products: Advanced Heat-Shrink Technology for Diverse Applications
a. Indoor Termination: Tailored for Optimal Indoor Performance.
b. Outdoor Termination: Offers Superior Protection Against Environmental Challenges.
c. Straight Through Joint: Facilitates Uninterrupted and Efficient Connections.
66kV ~500kV Premium Products: High-performance Solutions for Critical Infrastructure
a. Porcelain Outdoor Termination: Classic Durability for Outdoor Applications.
b. Compound Sleeve Termination: Innovative Design for Secure Connections.
c. GIS Termination (Assembly, Plug-in Type): Streamlined and Effective GIS Solutions.
d. Premould Termination: Pre-moulded Design for Consistency and Quality.
e. Straight Joint/Insulation Joint: Robust and Reliable Joining Solutions.
f. Branch Joint: Facilitates Effective Branching and Distribution.
g. Dry and Y Shape Branch Joint: Versatile Solutions for Complex Configurations.
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