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… Read more
Apr 29, 2013 | Edvard
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… Read more
Mar 02, 2013 | Edvard
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… Read more
Feb 18, 2013 | Edvard
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… Read more
Jan 12, 2013 | Edvard
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… Read more
Jan 09, 2013 | Edvard
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… Read more
Jan 05, 2013 | Edvard
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… Read more
Dec 22, 2012 | Edvard
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… Read more
Nov 27, 2012 | Edvard
Measurement of insulation resistance (IR) – 2
Continued from first part: Measurement of insulation resistance (IR) – Part 1 1. IR Values For Electrical Apparatus & Systems 2. IR Value for Transformer 3. IR Value for Tap Changer 4. IR Value for Electric… Read more
Apr 29, 2012 | jiguparmar
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… Read more
Apr 28, 2012 | jiguparmar
Erection Procedures For Medium Voltage Switchgear
Before commencing erection of medium voltage (MV) switchgear check that all connections are tight on busbars and on main and auxiliary circuits. Examine the insulation carefully, because there have been cases of burned out connections… Read more
Apr 03, 2012 | Edvard
Megger Insulation Resistance Test
As you know good insulation has high resistance and poor insulation relatively low resistance. The actual resistance values can be higher or lower, depending upon such factors as the temperature or moisture content of the… Read more
Mar 13, 2012 | Edvard
