Engineering Decision: When should you select (N)TSCGECEWÖU (with individual copper screens) instead of the standard common screen design?
Published by: Anhui Feichun Special Cable Co., Ltd.
Experts in Medium Voltage Reeling and Trailing Cable Solutions
1. Executive Summary: The “CE” Difference
2. Decoding the Designations (VDE 0250)
The difference lies in a single letter grouping within the VDE code, but it changes the entire electrical protection scheme.
| Code (代码) | Standard: (N)TSCGEWÖU | Enhanced: (N)TSCGECEWÖU |
|---|---|---|
| C / CE (Screening) | Common Earth Cores. Typically 3 bare or semi-conductive covered earth cores in the outer gaps. No metallic screen directly touching the phase insulation. 公共接地芯。 通常在外部缝隙中有3根裸露或半导电覆盖的接地芯。没有金属屏蔽直接接触相绝缘。 | Individual Metallic Screens (“CE”). Each phase core has its own concentric copper wire braid applied over the insulation/semicon layer. 独立金属屏蔽 (“CE”)。 每个相芯在绝缘/半导电层上都有自己的同心铜丝编织层。 |
| Field Control (电场控制) | Relying on semi-conductive layers. | Relying on semi-conductive layers PLUS a metallic Faraday cage per core. |
| Fault Path (故障路径) | Phase -> Semi-Con -> Earth Core in Interstice. | Phase -> Immediate Contact with Surrounding Screen. |
3. When to Select (N)TSCGECEWÖU: The 3 Critical Scenarios
The Problem: In a standard cable, if insulation is damaged, the leakage current must travel through the semi-conductive layer to reach the nearest earth core. This path has resistance.
The Solution: With (N)TSCGECEWÖU, the moment the insulation is breached, the current hits the individual metallic screen. This allows sensitive protection relays to detect a fault on Phase L1 specifically before it creates an arc to Phase L2. This is mandatory in many underground mines to prevent explosions.
问题： 在标准电缆中，如果绝缘受损，泄漏电流必须穿过半导电层才能到达最近的接地芯。这条路径有电阻。
解决方案： 使用 (N)TSCGECEWÖU，一旦绝缘被破坏，电流就会接触到独立的金属屏蔽。这允许灵敏的保护继电器在对相 L2 产生电弧之前，专门检测 L1 相上的故障。这在许多地下矿井中是强制性的，以防止爆炸。
The Physics: If a heavy rock crushes a standard cable, it might squeeze L1 and L2 together, causing a massive phase-to-phase short circuit.
The Shield: In (N)TSCGECEWÖU, the individual copper braids act as a physical barrier. A crushing force will force the Phase Conductor into its OWN earth screen first, tripping the breaker as a “Phase-to-Earth” fault (which is lower energy) rather than a dangerous “Phase-to-Phase” explosion.
物理原理： 如果一块巨石压碎了标准电缆，它可能会将 L1 和 L2 挤压在一起，导致巨大的相间短路。
屏障： 在 (N)TSCGECEWÖU 中，独立的铜编织层充当物理屏障。挤压力会迫使相导体首先接触其自身的接地屏蔽，从而作为“相多地”故障（能量较低）跳闸，而不是危险的“相间”爆炸。
Long Cable Runs: In very long reeling applications (e.g., >1000m), the capacitive charging currents can be significant. Individual screens provide a uniform, low-impedance path for these charging currents, distributing the electrical stress more evenly than a common earth arrangement.
长距离电缆运行： 在非常长的卷绕应用中（例如 >1000米），电容充电电流可能非常大。独立屏蔽为这些充电电流提供了均匀、低阻抗的路径，比公共接地布置更均匀地分布电场应力。
4. Construction Comparison at Anhui Feichun
We manufacture both types, but the (N)TSCGECEWÖU requires a more complex production process.
-
Conductor: Tinned Copper, Finely Stranded (Class 5).
导体： 镀锡铜，细绞合（第5类）。 -
Inner Semi-Con: Extruded.
内半导电层： 挤包。 -
Insulation: EPR Type 3GI3 (High Voltage Rubber).
绝缘： EPR Type 3GI3（高压橡胶）。 -
Outer Semi-Con: Extruded, fully bonded or strippable.
外半导电层： 挤包，全粘结或可剥离。 -
**The Difference**:
Standard: 3 Earth cores laid in interstices.
(N)TSCGECEWÖU: Individual Copper Wire Braid applied concentrically over EACH core’s semi-con layer.
**区别**：
标准型： 3根接地芯敷设在缝隙中。
(N)TSCGECEWÖU： 独立铜丝编织层同心地施加在每个线芯的半导电层上。
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