## Unbalanced Three Phase Circuit Analysis

Unbalanced Three Phase Circuit Analysis: Types of Unbalanced Loads - An unbalance exists in a circuit when the impedances in one or more phases differ from the impedances of the…

Continue Reading Unbalanced Three Phase Circuit Analysis

## Negative Phase Sequence Relay

Negative Phase Sequence Relay: A negative phase sequence relay (or phase unbalance) is essentially provided for the protection of generators and motors against unbalanced loading that may arise due to…

Continue Reading Negative Phase Sequence Relay

## Three Wattmeter and Two Wattmeter Method

Three Wattmeter and Two Wattmeter Method: In this method, the three wattmeter are connected in the three lines as shown in Fig. 9.45, i.e. the current coils of the three…

Continue Reading Three Wattmeter and Two Wattmeter Method

## Power in Three Phase Circuits

Power in Three Phase Circuits: Measurement of power by a wattmeter in a single phase circuit can be extended to measure Power in Three Phase Circuits. From earlier Section, it…

Continue Reading Power in Three Phase Circuits

## Inter Connection of Three Phase Source and Loads

Inter Connection of Three Phase Source and Loads: Inter Connection of Three Phase Source and Loads consists of for Parts, Namely Inter Connection of Three Phase Source Wye or Star-Connection…

## Phase Comparison Carrier Protection

Phase Comparison Carrier Protection: The phase comparison pilot-relaying operates on the principle of comparing the phase position of the currents at the two ends of the protected section. The Phase…

Continue Reading Phase Comparison Carrier Protection

## Derivation of Single Phase Quantity from Three Phase System

Derivation of Single Phase Quantity from Three Phase System: It will be seen later that auxiliary channels or pilot wires are used to transmit information from one end of the…

Continue Reading Derivation of Single Phase Quantity from Three Phase System

## Unbalanced Source Voltages Operations

Unbalanced Source Voltages Operations: As Supply voltage may sometimes become unbalanced, it is useful to know the effect of Unbalanced Source Voltages Operations on motor performance. Further, motor terminal voltage…

Continue Reading Unbalanced Source Voltages Operations