Answer / query

The correct procedure to Shut down VCB is to first trip the
VCB through Manual/electrical command . Then open the
Downstream(outgoing) isolator earth it for any trapped
charges. repaeat the same with the Upstream(Incoming)isolator.

Answer / balaji

1. Preparation (Permit to work)
2. Separation (Trip the Breaker)
3. Isolation (Isolator isolates)
4. Earthing & Short circuit (Earthing)
5. Screening & Marking the area (Barricading the work area)

Answer / manzoor hussain

1)First need to obtain isolation permit(work permit)
2)Confirm substation no., breaker no.
3)Inform to control engineer
4)Transfer the load from LV side
5)First need to trip the vcb(electrically or manually)
6)Disconnect DS switch (isolator)
7)Need to close the earth switch (ES)

how to calculate voltage regulation?

1 Answers   Qtech Software,

---

What happen if 200 KVAR capacitor connected to power continuesly?

0 Answers  

---

Is it advantages of having star-delta vfd than normal star vfd , if yes why?

0 Answers  

---

how we can produce negative DC voltage ? please explain it .,thank u

1 Answers  

---

HOW EFFICIENTLY LOAD IS SHARED BETWEEN ALTERNATORS

1 Answers  

---

What are armoured cables?

2 Answers   IOCL,

---

Where the Dry type tranformers are used.

5 Answers  

---

Seamless tubes are made by?

5 Answers   Bhel,

---

how many units (kwh) are there if in one MW?

5 Answers  

---

how to calculate relay rating for 50kw load

1 Answers   JNU,

---

What are the different types of hydro schemes?

0 Answers  

---

difference between the earthing,grounding and neutral

1 Answers   DLF, L&T,

---