Answer / rajan singh tanwar

This is based on
very simple
concept:-
It has three
letters and they
are coded as
follows:-

First Letter -
Operation
Quantity
A - Phase angle
comparison
B - Balanced Current
C - Current (Amps)
D - Differential
E - Direction
F - Frequency
K - Rate of rise of
current
M - Manual
O - Oil Pressure
P - Poly phase VA
R - Reactive VA
S - Slip Frequency
T - Temperature
V - Potential
W - Watts
X - Reactance
Y - Admittance
(Conductance)
Z - Impedance

Second Letter -
Measurement
A - Attracted
armature
B - Buchholz
C - Induction
D - Induction Disc
G - Galvanometer
I - Transmitter
J - Mixed Types
M - Magnet
(polarized)
P - Plug
R - Rectifier
S - Synchronized
Motor
T - Transistor
W - Weight (Gravity)

Third Letter -
Application
A - Auxiliary
B - Testing
C - Carrier or
Counting
D - Directional
E - Earth/Ground
F - Plug or Alarm
Indicator
G - General or
Generator
H - Harmonic
Restricted
J - Tripping
JE - Tripping
(Electrical
Reset)
JM - Tripping
(Manual
Reset)
JS - Tripping (Self)
JC - Tripping
(Conductor)
K - Check Alarm
L - Local Limiting
M - Same Phi or
motor
N - Negative
Sequence
O - Out of Step
P - Potential
Failure
R - Re-closing
S - Synchronizing
T - Timer or
Transformer
U - Definite Time
V - Voltage
Resistant
W - Piolet Wire
WA - Interposing
WS - Inter-tripping
X - Supervisory
Y - Flash Back
(Black
Fire)
Z - Special
Application
Z0 - Zero Sequence

Examples :
CDG - Current
(operation
), Disc
(Measurement),
General Purpose(
Application)
CAG - Current
(operation
), Attracted
armature(
Measurement),
General
Purpose(Application)
VAJ - Potential
(operation
), Attracted
armature(
Measurement),
Tripping(
Application)
VTT - Potential
(operation
), Transmitter(
Measurement),
Transformer
(Application)
VAZ - Potential (
operation),
Attracted
armature
(Measurement),
Special Application
VAA - Potential (
operation),
Attracted
armature
(Measurement),
Auxiliary
(Application)

Thanks I hope it
will help you.
Rajan Singh Tanwar
J.K.Cement Ltd.

Answer / tawumap ent

the first letter account for what is to be measured
the second letter is for the type of what causes the movement

so for the C part its for Current, for the V part its for
Voltage

The D is for disc operated. If u go and look closely on the
relays you will find an induction disc contained therein.

The other letters im going to figure out and tell you

Answer / k.prakashchandra

To add (As I remember)a few more. A- attracted armature
(Instantaneous), G- general purpose, H- high rupturing
capacity ( heavy duty),J- master trip,T- with timer and Z -
impedance

Answer / mithun mesta

J- Dc In comer
K- control,closing, Tripping
L- Alarm,Annunciation,
E- Potential Tranformer
H- AC supply
C- Protection Circuit
D- Metering Circuit
A- CT secondary for special protection

why efficiency of generator is greater than motor?

2 Answers  

---

I need the proper answer on :- What is the Earthing Value as per the standard for Raw power and UPS Pit and in panel /DB N-E value ???

2 Answers  

---

line diagram for mcb , mccb , rccb .

1 Answers  

---

How to calculate the diesel generator efficiency? what details are required to identify the running diesel generator sets with 1000 kVA & 180 kVA?

11 Answers   Greeves, Sudhir Power,

---

What do u understand voltage reg. of an alternator?

0 Answers   IOCL,

---

Difference between shunt, PMG and AREP excitation. Which is the most reliable between PMG and AREP.

1 Answers   ABB,

---

Construction of ac motor?

1 Answers  

---

what rectifiers is and what are the types of rectifiers?

1 Answers  

---

How to Prepare preventive maintenance shedule of machine tool.

1 Answers   Concast,

---

bit confused - am i correct in thinking that to determine line to line voltage in a star config 110v 3 phase 4 wire distribution system i would use a voltmeter? I have a circuit configured as an unbalanced load, consisting of three incandescent lamps (1x40w, 1x60w, 1x100w - all 110v rated)connected in a star configuration to a 110v 3 phase 4 wire distribution system. I want to find out what types of meters i would use to obtain: a) each line to line voltage b) the line to neutral voltage across each load c) current flowing in each line and load d) current flowing in the neutral conductor e) power supplied to the loads im assuming i would be using ammeters in series along each line and voltmeters in parallel across each line to neutral? Also how could i predict these meter readings before taking them and with which formulae? Any help would be greatly appreciated A.

1 Answers  

---

how we can calculate cable size for any load & any type of cable material ?

1 Answers  

---

Why Transformer Neutral having one earth pit ( more earth electrode resistance) whereas body have many earth pit ( less earth electrode resistance)?

1 Answers   OPS,

---