TRANSFORMERS AND PCB'S Flashcards
WHAT IS THE IDENTIFIER OF THE PRIMARY AND SECONDARY WINDINGS?
THE PRIMARY WINDINGS RECEIVES THE LINE INPUT
THE SECONDARY IS CONNECTED TO THE LOAD
WHAT IS A TRANSFORMER?
A MAGNETICALLY OPERATED MACHINE THAT CHANGES VOLTAGE, CURRENT, AND IMPEDANCE.
WHAT CANT A TRANSFORMER CHANGE?
FREQUENCY
WHAT IS THE IDENTIFIER OF AN AUTOTRANSFORMER?
AN AUTOTRANSFORMER ONLY HAS ONE SET OF WINDINGS FOR THE PRIMARY AND SECONDARY.
WHAT IS SELF INDUCTION?
WHEN A COIL INDUCES A VOLTAGE INTO ITSELF
WHAT IS AN ISOLATION TRANSFORMER?
THE PRIMARY AND SECONDARY WINDINGS ARE PHYSICALLY AND ELECTRONICALLY ISOLATED FROM EACH OTHER.
HOW ARE SOME AND ONLY ISOLATION TRANSFORMERS BUILT?
WITH A 1:1 TURN RATIO FOR ISOLATION ONLY
ALL TRANSFORMERS ARE PROPORTIONAL TO WHAT?
THERE TURNS RATIO.
WHAT IS MUTUAL INDUCTANCE?
THE ABILITY TO INDUCE VOLTAGE FROM ONE COIL TO ANOTHER.
NAME THE 3 FUNCTIONS OF THE OIL IN A TRANSFORMER.
COOLING, INSULATING, AND PREVENT MOISTURE.
EXPLAIN: I LINE= I PHASE
IN A WYE CONNECTION THE LINE AND PHASE CURRENT ARE THE SAME.
EXPLAIN: E LINE = E PHASE X 1.732
IN A WYE CONNECTION THE LINE VOLTAGE IS HIGHER THAN THE PHASE VOLTAGE BY A FACTOR OF THE SQUARE ROOT OF 3
EXPLAIN: I LINE = I PHASE X1.732
IN A DELTA CONNECTION THE LINE CURRENT IS HIGHER THAN THE PHASE CURRENT BY A FACTOR OF THE SQUARE ROOT OF 3.
EXPLAIN: E LINE = E PHASE
IN A DELTA CONNECTION THE LINE AND PHASE VOLTAGE ARE THE SAME.
WHAT ARE HARMONICS AND WHEN DO THEY OCCUR?
VOLTAGES OR CURRENTS THAT OPERATE AT A FREQUENCY THAT IS A MULTIPLE OF THE FUNDAMENTAL POWER FREQUENCY EX. 120,180,240,ETC.
