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What To Check When Commissioning Variable Speed Drives
What To Check When Commissioning Variable Speed Drives (on photo: Control techniques drives at Michelin; by emersonindustrial.com)The purpose of commissioning VSDsThe main purpose of commissioning VSDs...
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Maintenance and testing of the overcurrent protective devices
Maintenance and testing of the overcurrent protective devices (on photo: SIEMENS’s new 3VA2 molded case ciruit breaker up to 630 A, ETU, 400/690 V, up to 150 kA)Electrical system reliabilityWhen...
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Procedure for Transformer Lightning Impulse Test
Procedure for Transformer Lightning Impulse Test (photo credit: ABB)Purpose of the testThe purpose of the impulse voltage test is to secure that the transformer insultations withstand the lightning...
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5 Components of Current Drawn by the DC Voltage Testing of Insulation
Current drawn by the insulationWhen DC voltage is applied to an insulation, the electric field stress gives rise to current conduction and electrical polarization. Consider an elementary circuit as...
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12 Transformer Factory Tests Briefly Explained
Factory testsThe remainder of the twelve factory tests are briefly summarized below. The details of the test set connections and formulas of some of the listed tests are already described in separatly...
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13 Basic expressions often used in electrical testing
Testing of electrical installations //This is the simple list of basic terms you can often hear when testing and measurements of electrical installation (in general) is being performed. While...
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Resistance Measurement of Non-Conductive Walls and Floors
Electrically safe area //There are certain situations where it is desirable for a room to be totally isolated from the Protective Earth conductor (e.g. for conducting special tests in a laboratory...
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4 Steps To Follow During Commissioning of a PLC System
PLC programs are never final…Yes, PLC programs are never final, it is always possible to make corrections and subsequent adaptations to new system according the customer requirements. Even during...
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8 Recommended Periodic Inspections of a Substation Transformer
Medium power transformer routine maintenanceThe following periodic tests and inspections are recommended for routine maintenance of the medium power substation transformer.Gauge readingsCooling...
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Testing Challenges in Large Ground Systems
Large Ground SystemsAccurately Measuring Earth ResistanceLarge ground systems, such as those found in substations and power stations, are an important part of the protection of the electricity supply...
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Connections For Testing Insulation Resistance Of Electrical Equipment
Testing Insulation Resistance // 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...
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Guidelines To Inspection Of Molded Case Circuit Breakers (MCCB)
NEMA AB 4 and MCCB maintenance 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,...
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4 Test Instruments Most Frequently Used By Electricians
Testing an electrical installation // 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...
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How electricans test continuity of protective conductors
Testing protective conductors For all protective conductors, including main and supplementary bonding conductors, electricians must perform continuity test using a low-reading ohmmeter. For main...
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Guidelines For Installing Power Transformers
Operation of power transformers // When your transformer arrives on site, various procedures should be carried out to assure successful operation (installation, testing and various checkings). The...
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DC Testing Methods Conducted On Solid Insulation
DC Testing Methods // 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...
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18 Initial Checks Of Electrical Installations Every Electrician MUST Perform
Testing of electrical installations // Before any testing of low voltage electrical installations (and equipment) is carried out, a detailed physical inspection must be made to ensure that everything...
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Six core activities in the commissioning of the earthing system
Testing 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...
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Using digital multimeter for testing the charging system of your car
Testing the charging system To be honest with you, this article is about testing the car charging system and it. Read more
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Do’s and Don’ts When Measuring Insulation Resistance Of A Transformer
Insulation Resistance Measurement This test is performed at or above rated voltage to determine if there are low resistance paths. Read more
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