Answer / raghavendran

Checking of the pickup and dropout value

When checking the pickup value, the analogue input signals
of the single phase alternating test current have to be fed
to the relay via terminals.When testing the pickup value,
the alternating test current must first be lower than the
set pickup value.
Then the current will be increased until the relay picks up.
The value that can be read from the ammeter may not deviate
by more than ± 2.5% of the setting value. The tripping
values for the other current inputs should be checked
accordingly.

Function test
Disconnect all leads for adjusting the interposing C.T.s and
perform the following function test:
Load the generator with minimum 50% load. Assure that the
tripping of the generator C.B. does not cause un-wanted
damages (blackout).
To operate the differential relay use a shorting link
between one of the phase measuring sockets
and GND, e.g. connect Line to GND. The relay should trip
immediately. If no trip occurs, make sure
that the load current exceeds the set value.

in control panel, how can i measuring the distance between one bus bar to another bus bar. then now only for bus bar. in mpcb and contactor also. that means one mpcb to another mpcb how much distance? how can i calculate that.

0 Answers   ABB,

---

What is earth fault?

3 Answers  

---

WHY MOSTLY Rph IS USED FOR CONTROL CIRCUITS AUX. SUPPLY ?

0 Answers   UltraTech,

---

what is cut out fuse?

1 Answers  

---

What is majour reason of Electrical Arcing ?

9 Answers   ABB,

---

what happen if power factor goss to above unity (one) ? of any electrical system or motor.

10 Answers   Air Liquide,

---

how to select power and control contactor .

1 Answers   Bhel,

---

Mathemetical Relation Between KWRH and KWH?

3 Answers   UPPCL,

---

What Normal(Tangent) towers and Tension(Cut-point) Towers?

1 Answers   ABB, BGR Energy, NTPC, Powermec,

---

condider as 100 w lamps glowing . for completing a one unit how much time it should glow

3 Answers   Avalon,

---

What is the working principle of ceiling fan?

6 Answers   Indian Navy,

---

What happens if i apply 500V to 440V rotary Switch ?

0 Answers  

---