Electrical Laws
Ohm's Law Coulomb's Law Kirchoff's Law Faraday's Law Ampere's Law Joule's Law Lenz's Law Biot Savart LawElectrical Theorems
Thevenin Theorem Nortons Theorem Super Position Theorem Reciprocity Theorem Compensation Theorem Maximum Power Transfer Millmans Theorem Tellegans TheoremElectrical Rules
Flemings Left Hand Rule Flemings Right Hand Rule Cork Screw RuleElectrical Network
Network TerminologiesElectrical Terms
Electrical Terms Materials Capacitors Resistors Inductor Self Inductance Mutual Inductance Magnetic Flux Magnetic Characteristics EMF MMF Permeability Sources Reluctance TorqueElectrical Transformer
Transformers How Transformer Works Transformer Classifications Types Transformers Core Type Transformers Ideal Transformers Parallel Operation Transformer Cooling Transformer Forces Transformer Losses Transformer Testing Transformer Bushing Transformer WindingsTypes of Transformer
Auto Transformer Current Transformer Potential Transformer Rectifier Transformer Converter TransformerAC Motor
Stator and Rotor Three Phase Induction Motor Induction Motor TransformerAC Generator
AC Generators Alternator Stator Construction Alternator Rotor Construction Alternator - Parallel Operation Synchronizing AC Alternator Losses in AlternatorDC Motors
DC Motors Commutator Braking of Electric Motors Dynamic Rheostatic Braking Regenerative Braking Plugging Braking Speed Control DC Motor Losses DC MotorsTypes Of DC Motor
DC Motors Types DC Series Motors DC Shunt Motors DC Compound Motor Brushless DC Motors Permanent Magnet DC MotorStarter For DC Motors
Starters DC MotorsDC Generator
DC Generator Types DC Generators Sparking DC Generators Why Generator Overloading Losses DC GeneratorsParallel Operation
PO - DC Generator Series DC Generator Shunt DC Generator Compound DC GeneratorThe ones who are crazy enough to think they can change the world are the ones who do.- Steve Jobs
Rectifier Transformers
A combination of thyristors Rectifier and Transformer is said to be rectifier transformer. For higher voltage and lower current requirement, bridge type connection of thyristors are used in rectifier transformer. For lower voltage and higher current requirement, interphase connection of thyristors are used in rectifier transformer. Rectifier transformer can produce 6 pluse or 12 pulse as per circuit design.
Rectifier Transformer with Interphase connection
Interphase connection gives a symmetrical load to the 3Φ system. The current transfer from one phase to other phase occurs as soon as the potential of the succeeding phase rises above that of the preceding phase. Hence, the phase with the higher positive or negative potential carries the load current and determines the direct voltages. Here, two 3Φ connections are frequently paralleled through an interphase transformer in order to double the load current and to obtain six-pulse performance. This requires 180o phase shifted transformer secondaries. i.e) one secondary is connected in star and the other secondary is connected in inverse star shown below. Each secondary winding conducts during 1/6 of a cycle. Reflected to the primary side, the secondary currents in the two windings on each limb are opposite and 180o displaced and they can perfectly be balanced by symmetrical primary current, regardless of the primary connection. Since the primary side carries the current pulses of both the secondary stars, the primary winding are effectively used but the secondary rating is high as each secondary winding conducts only for 1/6 of a cycle
Rectifier Transformer with bridge connection
In bridge connection, the transformer secondary windings are idle most of the time, resulting in a high transformer rating compared with the converted power. These winding can be put to use more efficiently, if they feed bridge connected rectifier circuit. This is accomplished by combining two 3Φ commutating groups as shown below. A load cnnected between points 1 and 2 is supplied with the total of two voltages when viewed as separate groups. Since the two commutating groups operate with opposite polarity, their ripple voltages are displaced and the total voltage shows 6 pulse ripple.
Uses of Rectifier Transformer
Rectifier transformers are used for industrial processes which require a significant direct current (dc) supply.
- In traction.
- In electrolysis.
- In smelting operation.
- In large variable speed drive trains.
Related to Rectifier Transformers
Most visited
Report Us
We may make mistakes(spelling, program bug, typing mistake and etc.), So we have this container to collect mistakes. We highly respect your findings.
Programming
Electrical
Interview
© Copyright 2019