Answer / parthasarathy c

Diffrential protection is used to protect internal fault
like winding faults,it is used to protect the the
equipments like Generator,Transformer and bus bars.

If CT polarity changed in Directional type releys it will
give trip command when normal operating condition.

Brfore giving connection we must read name plate details to
avoid polarity change.

How to select the Cable size for 550 Amps Load without seeing the cable Catalogue?

8 Answers   Nesma,

---

why breaker closing coil gets burnt if supply is continously provided to it.

1 Answers   TATA,

---

How Size of Busbar is determined for a particular load.

2 Answers  

---

What is VCB? where it is installed at SP. What is SP?

0 Answers  

---

What is harmonics and how the 1st,2nd,3rd etc harmonic levels

2 Answers  

---

---

how does the rotating m.m.f is produced in the 3-phase induction motor and how the poles are created in 3-phase induction motor ?

0 Answers  

---

What is an 86-P or an 86-A trip

0 Answers  

---

What is difference between Over Current & Earth Fault protection?

0 Answers   ABC,

---

IN MY INDUSTRIES 125 HP MOTOR USED FOR THAT ONLOAD AMPS UP TO 280 SO CAN I USE ONE LOWER KVA DG SET WITH STEP UP TRANSFORMERS THAT MEANS WITH LOW POWER INPUT TO GET CONSTANT HIGH POWER OUTPUT EG:125KVA DG SET = 250 KVA STEP UP TRANSFORMERS

1 Answers  

---

While DG is on Load? we can start the capacitor bank?

3 Answers   Inorbit,

---

in a silicon diode we can measure .7v in a voltmeter.but why we can't use this voltage for using?

0 Answers  

---

int a,b ; a=b=10 ; if(a>b){ printf ("%d",a)}; no error output is a=10

2 Answers   TCS,

---