http://www.svri.nl/en/selecting-a-voltage-transformer-vt/

16 September 2019

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Selecting a Voltage Transformer (VT)

If the ratio, burden, class and optionally voltage factor are selected, the voltage transformer (VT) or potential transformer (PT) has been specified basically. Of course additional requirements like type, frequency, environmental conditions should also be specified.

Selecting a Current Transformer (CT)

If the current ratio, burden and class are selected, the current transformer (CT) has been specified basically. Of course additional requirements like type, frequency, isolation level, maximal short circuit current and environmental conditions should also be specified.

Generator Operation Modes

There are three modes of operation for generators: stand-alone, island and parallel with the utility. Each operation mode requires specific turbine fuel and generator excitation controls. In this post I describe features of each mode of operation.

Isochronous Vs Droop Control For Generators

What is isochronous control? And droop control? When should you use isochronous speed control and when droop? What is reactive droop compensation? In this post I will answer these questions.

Protection relays then and now

In the past, manufacturers assembled generator protection systems from electro-mechanical and later electronic relays. Each relay contained only one or some dedicated protective functions.

Voltage regulators then and now

Initially, an automatic voltage regulator (AVR) for generators was an electro-mechanical device with a variable resistance as an output. Generators with a dc exciter were often provided with the Brown Boveri (BBC) Universal Voltage Regulator.

Generator protection functions

The generator protection functions with their English and Dutch description, including ASCI/IEEE device codes and IEC symbols, are implemented in a table.

Engineering & Consultancy

I like to use my knowledge, experience and insight to proceed or solve my customer’s power system issues. Of course my designs, calculations and advises are based on power system engineering methods and common practice. My competences and specialisations are: Medium Voltage Power Systems (3 – 25 kV) Generators, Power Generation Protection Systems & Relays Excitation Systems, […]

Training Courses

Getting Started With SKM Power Tools Learn to work quickly and efficiently with the SKM Power Tools software. I provide this hands-on training as an internal training course that can take place at your location. The course duration is 1 ½ days.  Datasheet (PDF-file, 203 kB) Getting Started With Protection Relays Learn how to select, set and test […]