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TOSHIBA
Item
ing
point
Clperat- 1) Apply the rated
time
f a c t o r
Test method
Slowly reduce the
current and measure
the current value at
which the relay trips.
c u r r e n t
2) Quickly change
current in one phase
to 0 and measure the
time it takes for
the relay to trip.
current (IN).
one phase and
measure the current
at which the relay
trips.
--
-
-
Decision
75% rtlO% of the rated
current (IN)
Less than 4 s.
I II - IAVE I x loo%
IN
The calculated value must be
within *5% of the setting
value.
Example: When the setting
value is 30%. the
calculated
value
must be in the
range of 25 to 35%.
1 I: Measured current value.
Test
circuit
(single
phase)
Figure 16
Figure 16
Figure 16
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