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

which pump used in WTP explain the function of VFD how to dtermine capacitorbank of capacity one plant

0 Answers   Dalkia,

---

List the characteristics of filter?

0 Answers  

---

What is the formula for selecting the cabels according to load? How to calculate what sq.mm cabel to be used?

0 Answers  

---

why one side of tubelight glows after switch off ?

1 Answers  

---

how dia of wire and angles are calculated for overhead shielding wire to protect substation equipment from lightening strokes???

0 Answers  

---

what is the different between bus section and bus coupler

2 Answers  

---

What is BKW of Motor. And what its significance

1 Answers   CGL, PK, Thermax,

---

If the rank of a (5x6)matrix Q is 4, then which one of the following statements is correct ?

1 Answers   GATE,

---

i have old tape recorder speakers(analog).nw i want to use it for my computer system.can i use it to my computer systeno m by using digital to analog converter??? what changes should i do in the system????

0 Answers  

---

State the function of control rods used in nuclear reactor

1 Answers  

---

what is cascade speed control device?and how this device control the speed of motors?

0 Answers   ABB,

---

To measure insulation resistance of 11KV cable between core & armour, what should be the test voltage & duration?

4 Answers  

---