your electrical home

Type PM, 121-169 kV, up to 63 kA Power Circuit Breaker

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Type PM, 38-72.5 kV, up to 40 kA Power Circuit Breaker

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Rolling Stock AC Vacuum Circuit Breaker - ACTrac

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Outdoor Vacuum C.B. for Railway Applications - GSL II

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       Single-pole outdoor breaker        The GSL is part of the GSx product ran...

Outdoor Vacuum C.B. for Railway Applications - FSK II

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        Single or two-pole outdoor vacuum breaker with magnetic actuator        ...

Outdoor vacuum load-break switch for railway applications - FSG II

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        Single-pole outdoor vacuum load-break switch with magnetic actuator     ...

Indoor Vacuum C.B. Range for Railway Applications - GSx II

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      The GSx II range is the first commercially available single-phase vacuum circuit-breaker intended for the railway power supply and a...

IEC Live Tank Vacuum Mechanical Circuit Breaker VBF

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      The VBF breakers are designed per the latest IEC standards.       Vacuum Circuit Breakers VBF are designed...

Methods of Cooling Transformers

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       When transformer supplies a load, two types of losses occur inside the transformer. The iron losses occur in the core while copper lo...

Inductive Coupling in Parallel

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       When two inductors having self inductance L 1 and L 2 are coupled in parallel, we have two kinds of connections as follows.

Inductive Coupling in Series

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       When two inductors having self inductances L 1 and L 2 are coupled in series, mutual inductance M exists between them. Two kinds of...

Dot Convention and Equilibrium Equations

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Three Phase Transformer

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Excitation Phenomenon in Transformers

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Harmonics in Transformers

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Parallel Operation of Three Phase Transformers

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Construction of Vector Group Diagram

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Three Phase Transformer Phasor Groups

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Coefficient of Coupling or Magnetic Coupling Coefficient

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Introduction to Coupled Circuits

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       The two circuits are said to be coupled circuits if all or part of the electrical energy supplied to one circuit is transferred to th...

Design of Single Phase Transformer for Instrument Power Supply

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Parallel Operation of Transformers with Unequal Voltage Ratios

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Parallel Operation of Transformers With Equal Voltage Ratios

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Parallel Operation of Two Ideal Transformer

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Conditions for Satisfactory Parallel Operation

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Parallel Operation of Transformers

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All Day Efficiency of a Transformer

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Separation of Core Losses Test

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Sumpner's Test (Back to Back Test)

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Polarity Test

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O.C. and S.C. Tests on Single Phase Transformer

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Effect of Frequency and Supply Voltage on Iron Losses

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Effect of Power factor on Efficiency

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Condition for Maximum Efficiency

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Efficiency of a Transformer

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Losses in a Transformer

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Voltage Regulation of Transformer

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Approximate Voltage Drop in Transformer

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Equivalent circuit of Transformer

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Phasor Diagrams for Transformer on Load

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Equivalent Impedance

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Effect of Leakage Reactance

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Effect of Winding Resistances

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Examples on Generator Protection

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Generator Protection Part 13

Protection Against Unbalanced Loading

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Generator Protection Part 13

Negative Sequence Relays

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Generator Protection Part 12

Protection against Loss of Excitation

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Generator Protection Part 11

Rotor Earth Fault Protection

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Generator Protection Part 10

Stator Protection Against Interturn Faults

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Generator Protection Part 10

100% Earth Fault Protection

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Generator Protection Part 9

Balanced Earth Fault Protection for Generator

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Generator Protection Part 8

Unrestricted Earth Fault Protection

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Generator Protection Part 7

Restricted Earth Fault Protection of Generator

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Generator Protection Part 6

Merz-Price Protection of Alternator Stator Windings

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Generator Protection Part 5

Basic Percentage Differential protection Scheme for Generators

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Generator Protection Part 4

Basic differential protection Scheme for Generator

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Generator Protection Part 3

Abnormal Running Condition for Generator

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Generator Protection Part 2

Generator Protection

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Generator Protection Part 1

Winding Temperature Protection

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Transformer Protection Part 10 

Oil Pressure Relief Devices

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Transformer Protection Part 9

Restricted Earth Fault Protection

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Transformer Protection Part 8

Overcurrent Protection

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Transformer protection part 7

Generator-Transformer Unit Protection

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Transformer Protection : Part 6

Buchholz Relays

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Transformer Protection : Part 5

Frame Leakage Protection

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Transformer Protection : Part 4

Problems Encountered in Differential Protection

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Transformer Protection : Part 3