10 kV switchgear on KSO-E cubicles with vacuum circuit breakers and microprocessor protection — for a site in Chornomorsk

The task

Reconstruction of a 10 kV distribution point at an industrial site:

• two-section scheme — two independent incomers, sectionalizing by a breaker and a disconnector, automatic transfer;
• vacuum circuit breakers with microprocessor protection on the incomers, bus-section and outgoing feeder — modern switching and selective protection instead of obsolete oil breakers;
• auxiliary supplies — voltage transformers with metering circuits and operational circuits fed from a dedicated auxiliary transformer;
• cubicle dimensions to fit the existing switchgear room (single-side maintenance).

The solution

Six KSO-E-393V cubicles (2300 mm high — extended for the vacuum breaker and the relay compartment), configured per the design:

• Incomer-1 and Incomer-2 — cubicles with vacuum circuit breakers, bus and line disconnectors with manual drives and mechanical interlocks;
• Bus-section breaker and bus-section disconnector — section coupling with ATS;
• Outgoing feeder — vacuum breaker, current transformers, surge arresters;
• VT cubicle — voltage transformers with fuses and metering circuits; an auxiliary power transformer feeding the operational circuits.

Every switching cubicle carries a relay compartment with a Ukrainian-made microprocessor protection relay: overcurrent, instantaneous and earth-fault protection, breaker control from the front panel (buttons, mode selectors, ammeter, indicator lamps). Operational circuits are fed from power supply units in the relay compartments; phase-marked busbars; mimic diagrams and purpose labels on the doors; inspection windows for checks without opening.

Main-circuit apparatus is Ukrainian-made: vacuum breakers, disconnectors, current and voltage transformers, surge arresters.

For designers: the typical solutions "10 kV switching station on KSO with vacuum breakers" and "10 kV switching station on KSO cells".

Figures (from factory passports)

Photo report: from the vacuum breaker to the factory nameplate

We will build to your single-line diagram

KSO cubicles with vacuum breakers, microprocessor protection and ATS — from the diagram to factory testing. Leave a request and our engineer will work through your substation scheme.