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35kV busbars operating in parallel

Fiber and communications infrastructure knowledge brief Published 24 Sep 2023

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Parallel connection of 35kV busbars requires careful consideration of electrical, mechanical, and thermal conditions to ensure safe and reliable operation.

Electrical Conditions

Voltage and Phase Matching: Busbars must operate at the same voltage level and phase sequence to prevent circulating currents or phase-to-phase faults. Any mismatch can cause severe overcurrents and equipment damage. Impedance Matching: The parallel busbars should have similar impedance to ensure even load sharing.

Unequal impedance can lead to overloading of one busbar while underutilizing the other, increasing thermal stress and reducing system reliability. Protection Coordination: Busbar differential protection must be installed to detect faults on either busbar and operate quickly to isolate the faulted section without affecting the healthy busbar. Short-circuit current ratings (SCCR) must be verified to handle potential fault currents.

Insulation and Clearance: Adequate insulation between busbars and to ground is essential. For 35kV systems, clearances must comply with relevant standards to prevent flashover, and insulated connection sleeves may be used between sections to maintain a continuous potential-free system.

Mechanical and Thermal Conditions

Busbar Orientation and Spacing: Busbars should be arranged to minimize stray inductance, proximity effects, and attractive forces during normal operation and faults. Typically, the wide sides of busbars are oriented to reduce magnetic forces and optimize heat dissipation. Support and Fastening: Busbars must be supported with fixed or sliding bearings to accommodate thermal expansion and short-circuit forces.

Supports should prevent mechanical resonance at mains frequency and harmonics. Thermal Management: Parallel busbars must be capable of dissipating heat generated by load currents. Adequate spacing and ventilation are required to prevent overheating and maintain conductor integrity.

Operational Considerations

Load Sharing: Continuous monitoring ensures that each busbar carries its designed share of the load. Unequal load distribution can accelerate aging and reduce system reliability. Maintenance and Accessibility: Parallel busbars should allow safe access for inspection, maintenance, and tap-off connections without interrupting the entire system.

Modularity and Extendibility: Sections of busbars can be modular to facilitate installation, transport, and future expansion. Insulated connection sleeves between sections ensure continuity and safety.

Summary

To safely connect 35kV busbars in parallel, ensure voltage and phase alignment, impedance matching, proper protection, adequate insulation, mechanical support, thermal management, and load sharing. Following these conditions minimizes fault risks, mechanical stress, and thermal overload, ensuring reliable high-voltage power distribution.

35kV busbars operating in parallel - ENSAA OPTICAL NETWORKS [PDF]

35kV busbars operating in parallel

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Related Video Reference

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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