Answer / roy

primary injuction means we will inject the current in the
primary of the current transformer. and according to the CT
ratio and relay setting the relay will operate.
secondary injuction means we will disconnect the wires from
the secondary side of the CT and inject the current to the
relay directly. the relay will operate according to its
threshold.

Answer / yusuff ibrahim sipchem

Primary imnjection test- to test the circults including the primary circuit, i.e the CT by injecting the current to the busbar at low voltage, thew current will be according the busbar system rated current
Secondary injection test-to test the secondary circuit ony, whcih includes the relay and secondary wiring only. CTs can't be tested with this. in this the current will be normally 0-10Amps

directional over current relay when acted & how it works

3 Answers   NCC, ThyssenKrupp,

---

in ceiling fan and table fan what is the rotating part and what is the stationary part?

5 Answers  

---

what are the types of electromagnetic forces developed in practical transformer?

0 Answers   APC, BPCL Bharat Petroleum, Electrical Tech,

---

suri transmission

0 Answers   Bhel,

---

What is the basic difference between the electrical engineering and electronic engineering?

4 Answers  

---

hii this is ranjith from hyd... i want to know what type of questions they ask in interview...and hw the interview will go..? what subjects thay ask specially for electrical engg students?

0 Answers  

---

What are two contours of nichols chart?

0 Answers  

---

Is it necessary to seperate the DG earth grid with Electricity Board earth grid for protecting the DG set. if yes why?

2 Answers   BARC,

---

what is voltage,current,restance,. what is single phase&three phase motar. what is basic electrical 'farmoulas. what is defirens quetions of electrical maintenance.

2 Answers  

---

how is capacitor bank look like

0 Answers  

---

what you mean by frequency of an igbt& how to find it?

1 Answers  

---

What are unstable systems?

0 Answers  

---