Testing of transformer oil and winding temperature indicators

All large transformers have an oil or a winding temperature indicating device of some type, and most have temperature recorders as well. Indication may be for top-oil temperature or hotspot… Read more

Aug 10, 2016 | Edvard

Electricity and water do not form a happy partnership, do they?

Electricity and water do not form a happy partnership and so it is often necessary to “dry out” insulation. This may be done to remove surface moisture or perhaps to… Read more

Jul 13, 2016 | Edvard

Commissioning tests of protection relays at site (before set to work)

Installation of protection relays at site creates a number of possibilities for errors in the implementation of the scheme to occur. Even if the scheme has been thoroughly tested in… Read more

Jul 11, 2016 | Edvard

Why does electric motor fail and what can you do about it?

As you already know, electric motor is used everywhere in industry and in term of technology – it’s already pretty complex, sometimes making it a challenge to keep it running at… Read more

Jun 16, 2016 | Edvard

Do’s and don’ts when measuring insulation resistance of a transformer

This test is performed at or above rated voltage to determine if there are low resistance paths to ground or between winding to winding as a result of winding insulation… Read more

May 18, 2016 | Edvard

Using digital multimeter for testing the charging system of your car

To be honest with you, this article is about testing the car charging system and it isn’t applicable on new Tesla Model III or new BMW 7-series. As you can… Read more

May 16, 2016 | Edvard

Six core activities in the commissioning of the earthing system

Commissioning of new earthing system is essential as a validation step for the design and installation process and for the design inputs. In most cases commissioning should measure the outputs… Read more

Apr 02, 2016 | Edvard

18 initial checks of electrical installations that every electrician MUST perform

Before any testing of low voltage electrical installations (and equipment) is carried out, a detailed physical inspection must be made to ensure that everything is to a relevant National standard,… Read more

Mar 05, 2016 | Edvard

Defining size and location of capacitor in electrical system (1)

Type of Capacitor Bank as per Its Application: Fixed type capacitor banks Automatic type capacitor banks Types of APFC – Automatic Power Factor Correction Type of Capacitor as per Construction… Read more

Mar 04, 2016 | jiguparmar

DC Testing Methods Conducted On Solid Insulation

Let’s take a look at the two important tests that are conducted with DC voltage. Two tests can be conducted on solid insulation using following DC testing methods: insulation resistance… Read more

Feb 10, 2016 | Edvard

10 general guidelines for installing power transformers

When your transformer arrives on site, various procedures should be carried out to assure successful operation (installation, testing and various checkings). The successful operation of a transformer is dependent on… Read more

Feb 08, 2016 | Edvard

How electricians test continuity of protective conductors

For all protective conductors, including main and supplementary bonding conductors, electricians must perform continuity test using a low-reading ohmmeter. For main equipotential bonding, there is no single fixed value of… Read more

Feb 06, 2016 | Edvard

4 test instruments most frequently used by electricians

The test instruments and test leads used by the electrician for testing an electrical installation must meet all the requirements of the relevant regulations. The HSE has published Guidance Notes… Read more

Feb 03, 2016 | Edvard

Guidelines To Inspection Of Molded Case Circuit Breakers (MCCB)

The need for inspection of molded case breakers (MCCB) will vary depending on operating conditions. Suggested inspection and testing is defined in ANSI/NEMA AB 4, Guidelines for Inspection and Preventive… Read more

Jan 08, 2016 | Edvard

Connection Schemes For Testing Insulation Resistance Of Electrical Equipment

The following schemes show how to connect a Megger insulation tester to various types of electrical equipment. The schemes also show in principle how equipment must be disconnected from other circuits before… Read more

Nov 11, 2015 | Edvard