Answer / k.prakashchandra

Set OCR at 110 % of rated current, ground fault at 10-20 %
of OCR,inst trip at 2 to 6 times the OCR and SC(inst) at 8
times the OCR.

what is the function of Moulded case circuit breaker, why it is called Moulded?

0 Answers  

---

what is the effect when the shunt field winding is opened in dc shunt motor (i) at the time of starting ? (ii) in running condition ?

4 Answers  

---

what is power ratio between star & delta connection of 3 phase induction motor

1 Answers  

---

WHY TERTIARY OF POWER TRANSFORMERS IS LOADED WITH EQUIPMENTS LIKE CT,PT,ISOLATOR AND CB

0 Answers  

---

When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

0 Answers   Lupin,

---

Why the isolation treasforfer are connected at out put of the ups ig 200kva ??????????????????

3 Answers  

---

why we generate 11kv power supply in generating station?

1 Answers   DBG, NTPC,

---

what is the difference between ac motor and dc generator

0 Answers   ETA,

---

why current flows from +ve to -ve terminal

7 Answers  

---

why bulbs when connected in series glow dim

4 Answers  

---

1. A bomber drops a bomb from an aircraft flying at 2000 km/hr. at an altitude of 7km. The speed at which the bomb will strike the earth would be

0 Answers   KNJ,

---

what is positive , negative & zero equivalent system resistance

0 Answers  

---