How to Choose a Protection and Automation Scheme for a 10 kV Switchgear Cubicle: Protection Functions and Terminals
Protection functions for 10 kV cubicles — incomer, feeder, bus coupler, VT, auxiliary transformer: overcurrent protection, instantaneous cutoff, earth-fault protection, automatic transfer switching — and RS83 series terminals in LK Energy's standard solutions.
Technical specification for switchboard equipment: a customer checklist
What to state in the technical specification for a switchboard, cubicles or a substation: voltage and currents, short-circuit current, main circuit diagram, protection and metering, IP rating, cable entry and dimensions. A practical checklist from the manufacturer — so you get an accurate price and lead time from your first enquiry.
UKM: reactive power compensation — when you need it and how to choose
Why reactive power has to be compensated: cos φ, charges for reactive energy flows, unloading cables and transformers. When a plant needs a UKM, how an automatic unit differs from a fixed one, and when filter reactors are mandatory.
VFD or soft starter for a borehole pump: how to choose
Up to 11 kW — a soft starter; above 11 kW — a VFD. Why that rule, what each device actually does, and why a VFD does not save 30–50% on a borehole.
What makes up the price of a custom switchboard
The five components of the price — and why the same board to the same diagram appears with a 30–50% spread. What gets trimmed unseen, and what it costs later.
How to choose a switchgear manufacturer: a buyer’s checklist
Factory, assembler or middleman — and above all, what gets cut where you cannot see it. Nine hidden savings, how each surfaces within one to three years, plus a buyer’s checklist.
Selecting a circuit breaker: rating, Icu, selectivity
The costliest mistake in a switchboard costs nothing until a short circuit. Breaker selection per the code — with the conditions under which an exception is allowed.
AVR and the generator: what a genset needs for an automatic start
An AVR panel needs three things from a genset: auto-start controller, dry contacts, starter battery. Why a household generator cannot be automated.