110kV Composite Interphase Spacer

Structure

Core Rod: Epoxy fiberglass pultruded rod (bears tensile and bending loads)

Sheath Skirt: High-temperature vulcanized silicone rubber (HTV), aerodynamic umbrella shape, hydrophobic and anti-fouling

Ends: Crimped metal fittings; high-voltage level matching equalizing rings

Connection Types at Both Ends: B. Ball-and-socket type / C. Slot type / W. Universal joint / H. Ring type

Core Functions

1. Conductor anti-galloping (primary application): Connects different phase conductors within a span, mechanically coupling the phase conductors, mutually restraining them, suppressing low-frequency large-amplitude galloping under icing and strong winds, preventing phase-to-phase short circuit tripping.

2. Locking phase-to-phase safe distance: Commonly used in compact lines, compressing the line corridor, avoiding conductor proximity and phase-to-phase flashover caused by icing and sag changes.

3. Possesses dual properties of insulation and mechanical load bearing; essentially a long rod-shaped composite insulator, used as a phase-to-phase mechanical limiting component.

Product Features

- Excellent hydrophobicity of silicone rubber, eliminating the need for cleaning in heavily polluted areas and requiring no zero-value testing.

- Significantly lighter than ceramic interphase spacers, simplifying transportation and installation.

- Resistant to aging, ozone, and impact; not easily broken; can withstand high-flexure bending fatigue (500,000 bending vibrations).

- Suitable for single-conductor and split-conductor circuits

 

The Function

 

For Dual Conductor

spacer

For Single Conductor

1. Core Function of Phase-to-Phase Spacer Bars (Single/Double Split)

They are installed between different phases (A-B, B-C, A-C), not within the same phase:

1). Mechanical constraint to prevent galloping and ice breakage: Mechanically connecting two phase conductors, when one phase swings significantly, it is restrained by the other, limiting the amplitude of the galloping and preventing the phase-to-phase distance from narrowing;

2). Electrical insulation: The core bar + silicone rubber sheds provide phase-to-phase insulation, ensuring that the two phases will not short-circuit through the spacer bar during normal operation;

3). Maintaining the minimum phase-to-phase air gap to prevent phase-to-phase flashover tripping.

Ordinary split spacer bars are installed within the same phase to fix 2/4 sub-conductors within a phase. Do not confuse them.

2. Why can both single-conductor and double-conductor lines be adapted?

Single-conductor lines (such as many 110kV single-conductor lines): Each phase has only 1 conductor → Single-line clamps are attached to both ends of the spacer bar to directly clamp that single conductor of each phase.

Double conductor = Double-split conductor (commonly used in 220kV, one phase contains 2 sub-conductors: one phase consists of two parallel sub-conductors, first fixed together as a whole using in-phase split spacers; then one end of the interphase spacer is fixed to this double-split whole (with double-connecting plates/double clamps), treating the entire phase as a unit to establish cross-phase constraint with the other phase.

The insulation, bending resistance, and pressure bearing performance of the main composite insulation rod itself remain unchanged; only the end fittings are modified to adapt to whether one phase has a single or two sub-conductors.

3. Mechanical Logic (Why can both configurations achieve mutual constraint?) Galloping is the overall low-frequency, large-amplitude motion of the entire phase conductor, not the movement of a single sub-conductor:

Single conductor: The mass and stiffness of the entire phase are that single conductor;

Double-split: The two sub-conductors are locked together by in-phase split spacers, moving synchronously, equivalent to a single overall mass unit;

The interphase spacer connects the two phases as an overall unit, so regardless of whether the unit is 1 or 2... Both the root wires can achieve mutual restraint and suppression of two-phase motion.

The technical requirements:

1.Creepage distance:8340mm

2.SML:70kN.

3.Rated Voltage:110kV

  Lightning Impulse withstand voltage:650kV.

  Power frequency withstand voltage wet one minute:325kV

4. The coupling: The conductor

5. Color:Grey

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