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Monthly Archive for: «July, 2012»

Electric Motor

Thermal (Overload) Motor Relay Protection

The majority of winding failures in motor are either indirectly or directly caused by overloading (either prolonged or cyclic), operation on unbalanced supply voltage, or single phasing, which all lead… Read more

Jul 14, 2012 | By Edvard

Thermal (Overload) Motor Relay Protection
Energy and Power

Definitions from the Standard UL 489 (MCCB)

The requirements of this standard cover molded-case circuit breakers (MCCB), circuit breaker and ground-fault circuit-interrupters, fused circuit breakers, and accessory high-fault protectors. These circuit breakers are specifically intended to provide… Read more

Jul 12, 2012 | By Edvard

Definitions from the Standard UL 489 (MCCB)
Energy and Power

Delta-Star Transformer Connection Overview

In this type of connection, the primary connected in delta fashion while the secondary current is connected in star. The main use of this connection is to step up the… Read more

Jul 10, 2012 | By jiguparmar

GE Transformer delta-star nameplate
Electrical Lectures

Fundamental Concepts of Insulation Testing

Probably 80% of all testing performed in electrical power systems is related to the verification of insulation quality. This technical article briefly describes the fundamental concepts of insulation testing including… Read more

Jul 07, 2012 | By Edvard

Fundamental concepts of insulation testing
Energy and Power

Delta-Delta Transformer Connection Overview

In this type of connection, both the three phase primary and secondary windings are connected in delta as shown in the Figure 1: The voltages on primary and secondary sides… Read more

Jul 06, 2012 | By jiguparmar

Delta-Delta Transformer Connection Overview
Power Substation

Typical noise levels in power substation

Equipment noise levels may be obtained from manufacturers, equipment tendering documents, or test results. The noise level of a substation power transformer is a function of the MVA and BIL… Read more

Jul 05, 2012 | By Edvard

Typical noise levels in power substation
Energy and Power

Autotransformer Connection Explained

An ordinary transformer consists of two windings called primary winding and secondary winding. These two windings are magnetically coupled and electrically isolated. But the transformer in which a part of… Read more

Jul 02, 2012 | By jiguparmar

High efficiency autotransformer with 6%, 4%, 2% tap settings

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