Testing and Commissioning
Erection Procedure for Power Transformer
This technical article deals with transformers and their installation so we restrict ourselves here to the procedures associated with their commissioning. Transformers should be inspected for internal or external damage, particularly if they have been dropped or tipped over. This should include such… Read more
May 20, 2013 | By Edvard Csanyi
Testing and Commissioning
When a transformer has stomach pain and wants to…
During normal operation, transformer internal structures and windings are subjected to mechanical forces due to the magnetic forces. These forces are illustrated in Figure 1. By designing the internal structure very strong to withstand these forces over a long period of… Read more
May 08, 2013 | By Edvard Csanyi
High Voltage
Erection procedure for HV switchgear (Part 2)
Continued from first part: Erection procedure for HV switchgear (Part 1) Positioning of the cubicles should start near to the centre of the switchboard, installing as early as possible the enclosures associated with any special chambers or trunking. The first… Read more
May 01, 2013 | By Edvard Csanyi
High Voltage
Erection procedure for HV switchgear (Part 1)
Before commencing erection of HV switchgear check that all connections are tight on busbars and on main circuits as well as auxiliary circuits. Examine the insulation very carefully, because there have been reported cases of burned out connections due to… Read more
Apr 29, 2013 | By Edvard Csanyi
Testing and Commissioning
Transformer Routine Test – Measurement of Voltage Ratio and Check of Phase Displacement
The no-load voltage ratio between two windings of a transformer is called turn ratio. The aim of measurement is: Confirming the no-load voltage ratio given in the customer order specifications, determining the conditions of both the windings and the connections… Read more
Mar 02, 2013 | By Edvard Csanyi
Testing and Commissioning
Transformer Routine Test – Measurement Of No-Load Loss And Current
The no-load losses are very much related to the operational performance of a transformer. As long as the transformer is operated, these losses occur. For this reason, no load losses are very important for operational economy. No-load losses are also… Read more
Feb 18, 2013 | By Edvard Csanyi
Cables
Testing and Commissioning of MV/HV Cables
Compare cable data with drawings and specifications. Inspect exposed sections of cables for physical damage. Inspect bolted electrical connections for high resistance using one or more of the following methods: Use of a low-resistance ohmmeter in accordance with Section 1.2 above…. Read more
Jan 12, 2013 | By Edvard Csanyi
Testing and Commissioning
Testing and Commissioning of Substation DC System
Power substation DC system consists of battery charger and battery. This is to verify the condition of battery and battery charger and commissioning of them. Following instruments will be used for testing: Multimeter. (Learn how to use it) Battery loading… Read more
Jan 09, 2013 | By Edvard Csanyi
Testing and Commissioning
Transformer routine test – The measurement of winding resistance
Measurement is made to check transformer windings and terminal connections and also both to use as reference for future measurements and to calculate the load loss values at reference (e.g. 75ºC) temperature. Measuring the winding resistance is done by using… Read more
Jan 05, 2013 | By Edvard Csanyi
Energy and Power
Inspection and Test Procedures for Metal-Enclosed Busways
Visual and Mechanical Inspection Electrical Tests Test Values Test Values – Visual and Mechanical Test Values – Electrical Tables: TABLE 100.12 – US Standard Fasteners Bolt-Torque Values for Electrical Connections TABLE 100.1 – Insulation Resistance Test Values Electrical Apparatus and… Read more
Dec 22, 2012 | By Edvard Csanyi
Cables
Inspection and Test Procedures for LV Cables
Visual and Mechanical Inspection Electrical Tests Test Values TABLE 100.12 – US Standard Fasteners – Bolt-Torque Values for Electrical Connections Compare cable data with drawings and specifications. Inspect exposed sections of cables for physical damage and correct connection in accordance with… Read more
Nov 27, 2012 | By Edvard Csanyi
Energy and Power
Testing and Commissioning of Current Transformer
This technical article is prepared to help the commissioning personnel effectively perform and carry out the testing and commissioning tasks on current transformers before taking the equipment to service condition. General testing procedures for the current transformers (CTs) described in… Read more
Oct 19, 2012 | By Edvard Csanyi
Power Substation
Switching Impulse Test of the Transformer
The switching impulse test is applied to confirm the withstand of the transformer’s insulation against excessive voltages occurring during switching. During the switching impulse voltage test, the insulation between windings and between winding and earth and withstand between different terminals… Read more
Oct 11, 2012 | By Edvard Csanyi
Electric Motor
Measurement of insulation resistance (IR) – Part 2
This article goes into details of insulation resistance values measured by Megger tester on many different kinds of equipment, such as switchgear, electrical wires & cables, electric motors, transmission & distribution lines, and other power system equipment. An insulation tester… Read more
Apr 29, 2012 | By Jignesh Parmar
Cables
Measurement of insulation resistance (IR)
The measurement of insulation resistance is a common routine test performed on all types of electrical wires and cables. As a production test, this test is often used as a customer acceptance test, with minimum insulation resistance per unit length… Read more
Apr 28, 2012 | By Jignesh Parmar
