Answer / praveen

breaker capaciy taken by 132kv for example 133*1.55 times
capacity 145kv suitable for beaker

Answer / raghavendran.r

Step1: Calculate the system MVA.I have calculated that as 1.732*6600*800 = 9.144MVA. I have taken it as 10 MVA for easy calculations further.From the system MVA find out the Fault MVA value using the per unit impedance.i.e

Fault MVA = System MVA /P.u.Impedance.I am taking iot as .1
Hence we arrive at the Fault MVA.From this condition we get to know the Short circuit current as Isc = Fault MVA/Sys Voltage(6.6kV).

Usually, for a 6.6 kV system, the short circuit withstand rating is 40kA for 1 second.The Momentary current or making current is 2.55 times the Max. short circuit current.hHence we arrive at 100kA(Peak)

What is the permissible value of earth resistance!

11 Answers   Torrent Power,

---

What is the deffrence between Siemens S7-300 & S7-400 PLC?

4 Answers   ADC,

---

how to find the voltage's of a transmission line plzz help with pictures i am not able to understand

0 Answers   Student,

---

why are we using resistor in NGR ?

1 Answers  

---

I try to check the three phase voltage in multimeter, in 125A isolator switch incommer. first i touch R phase, and then i touch Y phase using multimeter, the moment i touched, it blasts and that moment i got blindness. multimeter selector position is correct(750V AC MODE AND RED PROBE WASS IN v AND BLACK PROBE WASS IN COM. MODE. COULD ANYBODY GIVE ANSWER FOR THIS TO AVOID FURTHER ACCIDENTS PLEASE?

2 Answers  

---

---

what is the principle of vvvf drive motor

3 Answers  

---

Briefing the effects of ASR and ACR of a double closed-loop speed regulating system.

0 Answers  

---

In synchronous generators field is rotor and armature is stator.Can we take the output at the rotor in case of synchronous generator by the dc excitation on the stator?

2 Answers  

---

Resistance of a conductor in a close electrical ckt is practically zero why?

1 Answers  

---

How to calculate the Short Circuit Impedance in Transformer?

3 Answers  

---

when we conduct high voltage testing why milli amp. is required?

2 Answers  

---

Please explain how to do 'tan-delta test' on AC generator? and where i get clear and brief detail, give any web page address.

1 Answers  

---