This article covers transformer impedance testing, one of the acceptances tests for new transformers, and a method for routine testing. The results of this test should compare directly to the manufacturer's datasheet. Related: Percentage Impedance of Transformer Application … [Read more...] about How to Test Percentage Impedance of Transformer?
Measurement
Measurement of Three Phase Power | Wattmeter Methods
This article explains the measurement of three-phase power in star connected or delta connecter load using the wattmeter methods. The power in a three phase load can be measured by following methods: Three wattmeter method Two wattmeter method One wattmeter … [Read more...] about Measurement of Three Phase Power | Wattmeter Methods
Current Transformer (CT) – Construction and Working Principle
A current transformer (CT) is a type of transformer that is used to measure AC current. It produces an alternating current (AC) in its secondary which is proportional to the AC current in its primary. Current transformers, along with voltage or potential transformers … [Read more...] about Current Transformer (CT) – Construction and Working Principle
Voltage and Power Equations of DC Motor | Condition of Maximum Power
In this post, we will look at the voltage and power equation of a dc motor and the condition for maximum power in a dc motor. Voltage Equation of a DC Motor The voltage V applied across the motor armature has to overcome the back emf Eb and supply the armature ohmic … [Read more...] about Voltage and Power Equations of DC Motor | Condition of Maximum Power
Difference between Dielectric Testing & Insulation Resistance Measurement
All electrical installations and equipment comply with insulation resistance specifications so they can operate safely. Whether it involves the connection cables, the sectioning and protection equipment, or the motors and generators, the electrical conductors are insulated … [Read more...] about Difference between Dielectric Testing & Insulation Resistance Measurement
Low Voltage Switchgear
As per IEC 60947, switchgears with rated voltages up to 1000 V ac and 1500 V dc are termed as low voltage switchgear. The term ‘switchgear’ is a generic term encompassing a wide range of products like circuit breakers, switches, switch fuse units, off-load isolators, HRC fuses, … [Read more...] about Low Voltage Switchgear
Three Types of Analog Instruments
An analog instrument is one in which the output or display is a continuous function of time and bears a constant relation to its input. The analog instruments find extensive use in present-day applications although digital instruments are increasing in number and applications. … [Read more...] about Three Types of Analog Instruments
Electric Potential, Potential Difference and EMF
In this article, you will study what are electric potential, the potential difference (PD) and electromotive force (emf) and the difference between them. Just as a body raised above the ground has gravitational potential energy, similarly, a charged body has electric potential … [Read more...] about Electric Potential, Potential Difference and EMF