Power Infrastructure
Self-Locking Spacer / Spacer Damper
The ZTT self-locking spacer replaces the traditional latch-type clamp with a quick self-locking mechanism. In ZTT's comparative test the traditional latch type takes 1:20 minutes per clamp to install versus 0:40 minutes for the quick self-locking type — saving over 50% of installation time. Unlike traditional latches, the self-locking clamps do not fall off in service, so the spacer is effectively maintenance-free and cannot fray the conductor. The forged aluminium-alloy eight-bundle spacer damper (developed 2021) is a member of the same family.
Features & Characteristics
- ▪Quick self-locking clamp — over 50% installation time saved (0:40 min vs 1:20 min per clamp in ZTT test).
- ▪Dual defensive function — clamps do not fall off in service, avoiding conductor fraying.
- ▪Maintenance-free operation over the life of the line.
- ▪Applicable to single, twin, quad and up to eight-bundle conductors (forged aluminium-alloy eight-bundle spacer damper, 2021).
Applications
- ▪Bundle-conductor overhead transmission lines from HV to UHV.
- ▪Long-span river crossings and UHV DC lines where maintenance access is difficult.
- ▪Refurbishment of existing lines suffering from latch fall-off failures.
Technical specifications
- Type
- Quick self-locking spacer / spacer damper
- Bundle configurations
- Twin, triple, quad and up to eight-bundle (forged aluminium alloy)
- Applicable standards
- BS / EN / IEC 61854, IS 10162
- QA tests
- Corrosion protection, clamp slip, clamp bolt tightening, simulated short-circuit current, compression & tension, flexibility (BS/EN/IEC 61854)
Installation time — ZTT comparative test
| Clamp type | Installation time per clamp |
|---|---|
| Traditional latch type | 1:20 minutes |
| Quick self-locking type | 0:40 minutes |
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