6~35kv Cable Accessories Classification Introduction
4E-NLS Cold Shrinkable Indoor Termination, 4E-WLS Cold Shrinkable Outdoor Termination, 4E-JLS Cold Shrinkable Joint
4E-NLS cold shrinkable indoor termination, 4E-WLS cold shrinkable outdoor termination, 4E-JLS cold shrinkable middle joint are mainly composed of prefabricated body, terminations (indoor and outdoor) or connecting tube (middle joint) cold shrinkable multi-core fingerstall ( supporting multi-core cable), and cold shrinkable insulation tubes and relative colormetric tube (indoor and outdoor termination). The prefabricated body stress cone and insulating body are using plastic injection molding of liquid silicone rubber, which has long-term stability of the package tight force and uniform electric field capacity. Always keep a suitable radial pressure to the cable body. The interface characteristic is good without respiration creepage breakdown when cable runs. The terminations or connecting tube meet cable core material requirements or users' requirements to ensure the protection of cable insulation and waterproof.
Excellent raw-material: prefabricated body is composed of high quality liquid silicone, which has excellent insulation, elongation, and breakdown properties, small residual deformation after expansion.
Cold shrinkable structure: using latest expansion equipment and expansion support tube to ensure product expand without damage.
Easy installation: using cold shrinkable expansion structure, there's no need special training, the labor is low due to convenient installation.
6~35KV cold shrinkable indoor, outdoor termination, and joint electrical performance parameters
| Rated voltage UO/U (Um) kV | 6/10(12.5) | 8.7/15(17.5) | 26/35(40.5) | Railway Uo=27.5 | Test result |
| 5min frequency voltage test | no flashover, without breakdown under 4.5Uo | no flashover, without breakdown |
| 1min frequency voltage under rain test |
no flashover, without breakdown under 4Uo | no flashover, without breakdown |
| Partial discharge at room temperature test | discharge volume under 1.73Uo ≤10PC | ≤1.6pC |
| Constant voltage load cycle in the air test | heated 2.5Uo and conductor to a temperature to 95-100°C three times, no flashover, without breakdown | no flashover, without breakdown |
| Partial discharge at high temperature test | heated cable conductor to 95-100°C, discharge volume under 1.73Uo ≤10PC | ≤1.6pC |
| Partial discharge at room temperature test | discharge volume under 1.73Uo ≤10PC | ≤1.6pC |
| Impulse voltage at high temperature test | 75kV | 95kV | 200kV | 25kV | no flashover, without breakdown |
| heated cable conductor to 95-100°C,both positive and negative polarity 10 times, no flashover, without breakdown |
| Constant voltage load cycle test | heated 2.5Uo and conductor to a temperature to 95-100°C sixty times, no flashover, without breakdown | no flashover, without breakdown |
| Partial discharge at high temperature test | heated cable conductor to 95-100°C, discharge volume under 1.73Uo ≤10PC | ≤1.6pC |
| Partial discharge at room temperature test | discharge volume under 1.73Uo ≤10PC | ≤1.6pC |
| Impulse voltage test | 75kV | 95kV | 200kV | 250kV | no flashover, without breakdown |
| both positive and negative polarity 10 times, no flashover, without breakdown |
| 15min frequency voltage test | no flashover, without breakdown under 2.5Uo | no flashover, without breakdown |
| Outdoor termination salt spray test | 1.25Uo,1000h, no flashover, without breakdown, no significant electrical corrosion and mechanical damage | no flashover, without breakdown |
| Indoor termination wet test | 1.25Uo, 300h, no flashover, without breakdown, no significant electrical corrosion and mechanical damage | no flashover, without breakdown |
