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When would you use current transformer?
A 'current transformer' (CT) is classified as an instrument transformer, which means it is used to provide a small secondary current that is in proportion to its large primary current, for purposes of metering or protection. At the same time, it electrically-isolates the secondary (metering) circuits from the primary circuits (which are often high-voltage circuits) for the purpose of safety.
Why do we use CT in a relay circuit?
CT is used in the relay circuits for protection purposes. As the current and voltage ratings in a power system are very high, it is not possible to measure currents and voltages of that magnitude as they are way too large for any meter of reasonable size and cost. The CT’s are generally standardized at 1 or 5 amperes secondary current. These are very moderate ratings, thus a 5 A ammeter can be used to measure 1000 amperes with the help of a 1000/5 A ratio CT. For this reason the relay circuits are connected with instrument transformers because the relay senses the input quantity before sending the trip signal to the circuit breaker, and these input quantities are measured by the use of instrument transformers.
What will happen if generator is overexcited?
if a generator is overexcited it is producing a large amount of reactive power which requires an increase in the alternator emf. To produce this emf, the rotor currents must increase resulting in extreme ohmic rotor losses.
Which starting system component uses a small amount of current to control a large amount of current?
I think its a starter solenoid or a relay. I know relays take high voltage current to power low voltage circuits. Hope that helps..
What is a curect transformer?
A 'current transformer' is a type of transformer which, together with a 'voltage transformer' (or 'potential transformer' in N America), is classified as being an 'instrument transformer'. It is used to reduce large currents to smaller currents which can be measured safely, and to isolate the primary circuit from the secondary circuit for the purposes of safety. Current transformers are also used to drive protective relays used in high-voltage protection systems.
What are the differences between bi-cmos and cmos technology?
CMOS circuits utilize complementary MOSFETs, i.e; NMOS and PMOS devices together in various patterns to create functional blocks like AND or OR gates. However the problem with these types of CMOS circuits is that they are inherently low power circuits. They cannot handle large currents. So when your block needs to have a large fan out (need to drive a large no of outputs, i.e; more current required) CMOS circuits fail. That is why we use BiCMOS. They are very similar to CMOS circuits except for the BJT(Bipolar Junction Transistor) output stage. BJTs are capable of carrying large currents, hence BiCMOS circuits are used in cases of large current requirements.
Large blank protects some animals?
the answer is large SIZE protects some animals.
What is small scale intregrated circuits?
small scale integrated circuits contain about 10 transistorsmedium scale integrated circuits contain about 100 transistorslarge scale integrated circuits contain about 1000 transistorsvery large scale integrated circuits contain about 10,000 transistorsultra large scale integrated circuits contain about 100,000 transistorsetc.modern digital integrated circuits contain about 100,000,000,000 transistors and sometimes much more
What do you use to measure a current in a circuits?
An ammeter either directly, or via a current transformer, is used to measure current in a circuit.Current Transformers (CTs) are necessary when either (1) you need to measure the large currents flowing in high-voltagesystems (a CT will isolate the HV system from the ammeter to which it is connected, as well as reduce the value of the HV current) or (2) you need to reduce the very large currents to be measured in medium-voltage systems.
What is a large wind driven surface currents that create circular movements in the ocean?
What is a large wind driven surface currents that create circular movements in the ocean?
How do convection currents occur?
the dinosaurs go poof as the went into the earths center
What protects the large intestine?
mucus
What can you use to identify large electrical currents?
A voltmeter
What are large streams of surface sea water called?
IT'S called ocean currents or just called currents.
Does earth atmosphere protects large changes of temperature and bad sun rays?
does earth atmosphere protects large change of temperature and bad sun rays?
What are small-scale and large-scale wind currents called?
Large-scale and small-scale wind currents are called macroscale or synoptic scale. Hope this will help ^_^ By Chloe
What is fabrication in vlsi?
VLS refers to very large scale circuits
