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# Difference between two quadrant and four quadrant energy meters

J

#### Jaspreet

Jan 1, 1970
0
Hi,

What i want to know:
I just want to ask a very basic question.
I read it many times that four quadrant energy meters are
bi-directional and two quadrant energy meters are uni-directions (or
ratcheted). I want to know what are these four quadrants ( preferebly
on cartesian chart shown below)and how does a meter operated in these

4 Quadrant and 2 quadrant action of a motor is described below. But a
meter can't act as a generator. Then why people describe meters as two

============================================================================
What i know :
In motor/generator operation, the term two quadrant/ four quadrant
comes from the speed vs. torque chart. It is normally a Cartesian
coordinate chart where the +/- speed is the x axis and the torque is
in the +/- y axis. See chart [hopefully intact]

t|
II o| I
r|
q| speed
------------u--------------
e|
III | IV
|
|

Two quadrant means that the motor drive operates between quandrant I
and III. These types of motor can not stop instantly and reverse
directions.

Four quadrant motor drive operate in all four quadrants. These types
of drives can do both "motoring" (I & III) and generating (II & IV).
The motor acts as a generator when its inertia is continues to rotate
it one way when it is in reverse rotation.

-----------------------------------------------------------------

Please explain it in cartesian coardinates, if possible.

Regards,
Jaspreet

J
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