Answer / steven karris

These terms appear in the calculation of fault currents.
Common sources of fault currents are rotating machines,
i.e., motors and generators. An important factor in
detrmining the magnitude of a fault current is a variable
reactance that changes rapidly after the initiation of the
fault until it reaches a steady state.
Subtransient Reactance, usually denoted as X''d (X double
prime sub d), is the reactance used to determine the
current during the first cycle after the occurance of the
fault. In about 0.1 second this reactance increases to the
level known as Transient Reactance usually denoted as X'd,
and after 0.5 to 2 seconds it increases to the leven known
as Synchronous Reactance and denoted as Xd, and this
determines the fault current after a steady condition is
reached.

Answer / babak turkan

subtransient reactance in percent normally for induction motors is 16.7 5

what is the back ground of transformer working? applying voltage to primary and emf inducing in primary and secondary? how it is possible? please answer me with scientific approach?

5 Answers  

---

difference between ac motor and dc motor

5 Answers  

---

How RTCC panel is working and give single line diagram for RTCC with transformer?

0 Answers   AB Associates,

---

if 15 kv is grounding directly what will happen?

5 Answers  

---

1.What is wind span ,wight span and normal span, and what is the difference for 132kv transmission .

1 Answers   PKR,

---

How many types of oil using in H/T & L/T Oil Circuit Breakers. need Explenation ?

0 Answers  

---

what is the difference between STAR and DELTA connection and application wise how it can be utilizedd

0 Answers  

---

what are the effects when the frequency is decreased in any ac machine

1 Answers  

---

what is the function of NAT & NAC contacts in breaker control switch (TNC)??

2 Answers  

---

What is application/Function of Electro chlorinator in Offshore Oil & gas Platform ?

1 Answers  

---

what is dc system? how getting pulse from rectifier?

1 Answers   ETA,

---

1)What are the proccedure of initial charge of 100AH lead Acid battery bank 2)whether discharge test is reqd ? if it is rqd why, how 3)what are the discharge critieria (volt/cell or sp.gravity/cell

1 Answers  

---