Category Archives: Power Distribution System

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Method Statement for Variable Frequency Drives VFD Testing and Commissioning

In one of our previous post we mentioned details about the variable frequency drives principle. Now this page provides you the method of testing and commissioning of VFD drives in simple steps. Remember before testing all installation and construction completion should be approved. Power Connection Requirements: Megger the incoming and outgoing power cable & connections for… Read More: Method Statement for Variable Frequency Drives VFD Testing and Commissioning »

Cable Sizing & Voltage Drop Calculations Formula

Cable sizing is done based on three parameters: Load current, Short circuit current carrying capacity, Voltage drop. Below are given simple steps for performing cable sizing calculations. Step 1 – Calculate Load Current: Calculate the load current from the load data available. Formula is: I=Load (in kW)/(sqrt(3)V(in kV)p.f) (A) The current obtained has to derated… Read More: Cable Sizing & Voltage Drop Calculations Formula »

Standard Checks & Tests for MDB, SMDB, DB & Motor Control Center

lv switchgear panels installation method

As a standard practice installer or contractor shall arrange for the witnessing of the following tests on the fully equipped switchboards (main, submain distribution boards and Motor Control Centers MCC) including primary bus bars and connections at the factory, in accordance with IEC 439-1: High voltage power frequency tests on main and auxiliary circuits Dielectric/insulation… Read More: Standard Checks & Tests for MDB, SMDB, DB & Motor… »

Medium-Voltage Switchgear Type NXPLUS C Wind Features & Requirements

Medium-Voltage Switchgear Type NXPLUS C Wind Features & Requirements

Siemens Fixed-Mounted Circuit-Breaker Switchgear Type NXPLUS C Wind up to 36 kV, Gas-Insulated. Environmental independence Hermetically tight, welded switchgear vessels made of stainless steel as well as single-pole solid insulation make the parts of the primary circuit under high voltage of NXPLUS C Wind switchgear Insensitive to certain aggressive ambient conditions, such as: – Saline air… Read More: Medium-Voltage Switchgear Type NXPLUS C Wind Features & Requirements »

Air Blast Circuit Breaker | Construction & Operating Mechanism

air blast circuit breaker ABCB

A circuit breaker is a mechanical switching device, capable of making, carrying and breaking currents under normal circuit conditions. It is also capable of making and carrying currents for a specified time and breaking currents under specified abnormal circuit conditions, such as those of a short circuit. Air Blast Circuit Breaker is one of major… Read More: Air Blast Circuit Breaker | Construction & Operating Mechanism »